docker: Add tools for preproducing load issues

Co-authored-by: Kaltenbach, Jonas <jonas.kaltenbach@zoi.de>

.github/workflows/continuous-integration.yaml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go-version: [1.16.x, 1.17.x]
+        go-version: [1.16.x, 1.17.x, 1.18.x]
         platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     env:

.github/workflows/release.yaml

@@ -80,10 +80,10 @@ jobs:
         uses: actions/checkout@v3
 
       -
-        name: Install Go 1.17.2
+        name: Install Go 1.18
         uses: actions/setup-go@v3
         with:
-          go-version: '1.17.2'
+          go-version: '1.18'
 
       -
         name: Build TUSD

.gitignore

@@ -5,4 +5,6 @@ node_modules/
 .DS_Store
 ./tusd
 tusd_*_*
+__pycache__/
+examples/hooks/plugin/hook_handler
 .idea/

Dockerfile

@@ -14,6 +14,7 @@ RUN set -xe \
 COPY cmd/ ./cmd/
 COPY internal/ ./internal/
 COPY pkg/ ./pkg/
+COPY examples/ ./examples/
 
 # Get the version name and git commit as a build argument
 ARG GIT_VERSION
@@ -24,6 +25,10 @@ RUN set -xe \
         -ldflags="-X github.com/tus/tusd/cmd/tusd/cli.VersionName=${GIT_VERSION} -X github.com/tus/tusd/cmd/tusd/cli.GitCommit=${GIT_COMMIT} -X 'github.com/tus/tusd/cmd/tusd/cli.BuildDate=$(date --utc)'" \
         -o /go/bin/tusd ./cmd/tusd/main.go
 
+RUN set -xe \
+    && GOOS=linux GOARCH=amd64 go build \
+        -o /go/bin/hooks_handler ./examples/hooks/plugin/hook_handler.go
+
 # start a new stage that copies in the binary built in the previous stage
 FROM alpine:3.16.2
 WORKDIR /srv/tusd-data
@@ -39,6 +44,7 @@ RUN apk add --no-cache ca-certificates jq bash \
     && chmod +x /usr/local/share/docker-entrypoint.sh /usr/local/share/load-env.sh
 
 COPY --from=builder /go/bin/tusd /usr/local/bin/tusd
+COPY --from=builder /go/bin/hooks_handler /usr/local/bin/hooks_handler
 
 EXPOSE 1080
 USER tusd

cmd/tusd/cli/composer.go

@@ -7,7 +7,6 @@ import (
 	"strings"
 
 	"github.com/tus/tusd/pkg/azurestore"
-	"github.com/tus/tusd/pkg/filelocker"
 	"github.com/tus/tusd/pkg/filestore"
 	"github.com/tus/tusd/pkg/gcsstore"
 	"github.com/tus/tusd/pkg/handler"
@@ -17,6 +16,11 @@ import (
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/aws/session"
 	"github.com/aws/aws-sdk-go/service/s3"
+
+	"github.com/minio/minio-go/v7"
+	"github.com/minio/minio-go/v7/pkg/credentials"
+
+	"github.com/prometheus/client_golang/prometheus"
 )
 
 var Composer *handler.StoreComposer
@@ -26,47 +30,76 @@ func CreateComposer() {
 	// If not, we default to storing them locally on disk.
 	Composer = handler.NewStoreComposer()
 	if Flags.S3Bucket != "" {
-		s3Config := aws.NewConfig()
+		var s3Api s3store.S3API
 
-		if Flags.S3TransferAcceleration {
-			s3Config = s3Config.WithS3UseAccelerate(true)
-		}
-
-		if Flags.S3DisableContentHashes {
-			// Prevent the S3 service client from automatically
-			// adding the Content-MD5 header to S3 Object Put and Upload API calls.
-			s3Config = s3Config.WithS3DisableContentMD5Validation(true)
-		}
-
-		if Flags.S3DisableSSL {
-			// Disable HTTPS and only use HTTP (helpful for debugging requests).
-			s3Config = s3Config.WithDisableSSL(true)
-		}
-
-		if Flags.S3Endpoint == "" {
+		if !Flags.S3UseMinioSDK {
+			s3Config := aws.NewConfig()
 
 			if Flags.S3TransferAcceleration {
-				stdout.Printf("Using 's3://%s' as S3 bucket for storage with AWS S3 Transfer Acceleration enabled.\n", Flags.S3Bucket)
-			} else {
-				stdout.Printf("Using 's3://%s' as S3 bucket for storage.\n", Flags.S3Bucket)
+				s3Config = s3Config.WithS3UseAccelerate(true)
 			}
 
-		} else {
-			stdout.Printf("Using '%s/%s' as S3 endpoint and bucket for storage.\n", Flags.S3Endpoint, Flags.S3Bucket)
+			if Flags.S3DisableContentHashes {
+				// Prevent the S3 service client from automatically
+				// adding the Content-MD5 header to S3 Object Put and Upload API calls.
+				//
+				// Note: For now, we do not set S3DisableContentMD5Validation because when terminating an upload,
+				// a signature is required. If not present, S3 will complain:
+				// InvalidRequest: Missing required header for this request: Content-MD5 OR x-amz-checksum-*
+				// So for now, this flag will only cause hashes to be disabled for the UploadPart operation (see s3store.go).
+				//s3Config = s3Config.WithS3DisableContentMD5Validation(true)
+			}
 
-			s3Config = s3Config.WithEndpoint(Flags.S3Endpoint).WithS3ForcePathStyle(true)
+			if Flags.S3DisableSSL {
+				// Disable HTTPS and only use HTTP (helpful for debugging requests).
+				s3Config = s3Config.WithDisableSSL(true)
+			}
+
+			if Flags.S3Endpoint == "" {
+				if Flags.S3TransferAcceleration {
+					stdout.Printf("Using 's3://%s' as S3 bucket for storage with AWS S3 Transfer Acceleration enabled.\n", Flags.S3Bucket)
+				} else {
+					stdout.Printf("Using 's3://%s' as S3 bucket for storage.\n", Flags.S3Bucket)
+				}
+			} else {
+				stdout.Printf("Using '%s/%s' as S3 endpoint and bucket for storage.\n", Flags.S3Endpoint, Flags.S3Bucket)
+
+				s3Config = s3Config.WithEndpoint(Flags.S3Endpoint).WithS3ForcePathStyle(true)
+			}
+
+			// Derive credentials from default credential chain (env, shared, ec2 instance role)
+			// as per https://github.com/aws/aws-sdk-go#configuring-credentials
+			s3Api = s3.New(session.Must(session.NewSession()), s3Config)
+		} else {
+			core, err := minio.NewCore(Flags.S3Endpoint, &minio.Options{
+				Creds:  credentials.NewEnvAWS(),
+				Secure: !Flags.S3DisableSSL,
+				Region: os.Getenv("AWS_REGION"),
+			})
+			if err != nil {
+				stderr.Fatalf("Unable to create Minio SDK: %s\n", err)
+			}
+
+			// TODO: Flags.S3TransferAcceleration
+			// TODO: Flags.S3DisableContentHashes
+
+			s3Api = s3store.NewMinioS3API(core)
 		}
 
-		// Derive credentials from default credential chain (env, shared, ec2 instance role)
-		// as per https://github.com/aws/aws-sdk-go#configuring-credentials
-		store := s3store.New(Flags.S3Bucket, s3.New(session.Must(session.NewSession()), s3Config))
+		store := s3store.New(Flags.S3Bucket, s3Api)
 		store.ObjectPrefix = Flags.S3ObjectPrefix
 		store.PreferredPartSize = Flags.S3PartSize
+		store.MaxBufferedParts = Flags.S3MaxBufferedParts
 		store.DisableContentHashes = Flags.S3DisableContentHashes
+		store.SetConcurrentPartUploads(Flags.S3ConcurrentPartUploads)
 		store.UseIn(Composer)
 
 		locker := memorylocker.New()
 		locker.UseIn(Composer)
+
+		// Attach the metrics from S3 store to the global Prometheus registry
+		// TODO: Do not use the global registry here.
+		store.RegisterMetrics(prometheus.DefaultRegisterer)
 	} else if Flags.GCSBucket != "" {
 		if Flags.GCSObjectPrefix != "" && strings.Contains(Flags.GCSObjectPrefix, "_") {
 			stderr.Fatalf("gcs-object-prefix value (%s) can't contain underscore. "+
@@ -151,7 +184,9 @@ func CreateComposer() {
 		store := filestore.New(dir)
 		store.UseIn(Composer)
 
-		locker := filelocker.New(dir)
+		// TODO: Do not use filelocker here, because it does not implement the lock
+		// release mechanism yet.
+		locker := memorylocker.New()
 		locker.UseIn(Composer)
 	}
 

cmd/tusd/cli/flags.go

@@ -2,13 +2,8 @@ package cli
 
 import (
 	"flag"
-	"fmt"
-	"log"
-	"os"
 	"path/filepath"
-	"runtime/pprof"
 	"strings"
-	"time"
 
 	"github.com/tus/tusd/cmd/tusd/cli/hooks"
 )
@@ -28,8 +23,11 @@ var Flags struct {
 	S3ObjectPrefix          string
 	S3Endpoint              string
 	S3PartSize              int64
+	S3MaxBufferedParts      int64
 	S3DisableContentHashes  bool
 	S3DisableSSL            bool
+	S3ConcurrentPartUploads int
+	S3UseMinioSDK           bool
 	GCSBucket               string
 	GCSObjectPrefix         string
 	AzStorage               string
@@ -38,6 +36,7 @@ var Flags struct {
 	AzObjectPrefix          string
 	AzEndpoint              string
 	EnabledHooksString      string
+	PluginHookPath          string
 	FileHooksDir            string
 	HttpHooksEndpoint       string
 	HttpHooksForwardHeaders string
@@ -46,20 +45,21 @@ var Flags struct {
 	GrpcHooksEndpoint       string
 	GrpcHooksRetry          int
 	GrpcHooksBackoff        int
-	HooksStopUploadCode     int
-	PluginHookPath          string
 	EnabledHooks            []hooks.HookType
+	ProgressHooksInterval   int64
 	ShowVersion             bool
 	ExposeMetrics           bool
 	MetricsPath             string
+	ExposePprof             bool
+	PprofPath               string
+	PprofBlockProfileRate   int
+	PprofMutexProfileRate   int
 	BehindProxy             bool
 	VerboseOutput           bool
 	S3TransferAcceleration  bool
 	TLSCertFile             string
 	TLSKeyFile              string
 	TLSMode                 string
-
-	CPUProfile string
 }
 
 func ParseFlags() {
@@ -77,8 +77,11 @@ func ParseFlags() {
 	flag.StringVar(&Flags.S3ObjectPrefix, "s3-object-prefix", "", "Prefix for S3 object names")
 	flag.StringVar(&Flags.S3Endpoint, "s3-endpoint", "", "Endpoint to use S3 compatible implementations like minio (requires s3-bucket to be pass)")
 	flag.Int64Var(&Flags.S3PartSize, "s3-part-size", 50*1024*1024, "Size in bytes of the individual upload requests made to the S3 API. Defaults to 50MiB (experimental and may be removed in the future)")
+	flag.Int64Var(&Flags.S3MaxBufferedParts, "s3-max-buffered-parts", 20, "Size in bytes of the individual upload requests made to the S3 API. Defaults to 50MiB (experimental and may be removed in the future)")
 	flag.BoolVar(&Flags.S3DisableContentHashes, "s3-disable-content-hashes", false, "Disable the calculation of MD5 and SHA256 hashes for the content that gets uploaded to S3 for minimized CPU usage (experimental and may be removed in the future)")
 	flag.BoolVar(&Flags.S3DisableSSL, "s3-disable-ssl", false, "Disable SSL and only use HTTP for communication with S3 (experimental and may be removed in the future)")
+	flag.IntVar(&Flags.S3ConcurrentPartUploads, "s3-concurrent-part-uploads", 10, "Number of concurrent part uploads to S3 (experimental and may be removed in the future)")
+	flag.BoolVar(&Flags.S3UseMinioSDK, "s3-use-minio-sdk", false, "Use the Minio SDK interally (experimental)")
 	flag.StringVar(&Flags.GCSBucket, "gcs-bucket", "", "Use Google Cloud Storage with this bucket as storage backend (requires the GCS_SERVICE_ACCOUNT_FILE environment variable to be set)")
 	flag.StringVar(&Flags.GCSObjectPrefix, "gcs-object-prefix", "", "Prefix for GCS object names")
 	flag.StringVar(&Flags.AzStorage, "azure-storage", "", "Use Azure BlockBlob Storage with this container name as a storage backend (requires the AZURE_STORAGE_ACCOUNT and AZURE_STORAGE_KEY environment variable to be set)")
@@ -87,6 +90,8 @@ func ParseFlags() {
 	flag.StringVar(&Flags.AzObjectPrefix, "azure-object-prefix", "", "Prefix for Azure object names")
 	flag.StringVar(&Flags.AzEndpoint, "azure-endpoint", "", "Custom Endpoint to use for Azure BlockBlob Storage (requires azure-storage to be pass)")
 	flag.StringVar(&Flags.EnabledHooksString, "hooks-enabled-events", "pre-create,post-create,post-receive,post-terminate,post-finish", "Comma separated list of enabled hook events (e.g. post-create,post-finish). Leave empty to enable default events")
+	flag.Int64Var(&Flags.ProgressHooksInterval, "progress-hooks-interval", 1000, "Interval in milliseconds at which the post-receive progress hooks are emitted for each active upload")
+	flag.StringVar(&Flags.PluginHookPath, "hooks-plugin", "", "Path to a Go plugin for loading hook functions")
 	flag.StringVar(&Flags.FileHooksDir, "hooks-dir", "", "Directory to search for available hooks scripts")
 	flag.StringVar(&Flags.HttpHooksEndpoint, "hooks-http", "", "An HTTP endpoint to which hook events will be sent to")
 	flag.StringVar(&Flags.HttpHooksForwardHeaders, "hooks-http-forward-headers", "", "List of HTTP request headers to be forwarded from the client request to the hook endpoint")
@@ -95,19 +100,19 @@ func ParseFlags() {
 	flag.StringVar(&Flags.GrpcHooksEndpoint, "hooks-grpc", "", "An gRPC endpoint to which hook events will be sent to")
 	flag.IntVar(&Flags.GrpcHooksRetry, "hooks-grpc-retry", 3, "Number of times to retry on a server error or network timeout")
 	flag.IntVar(&Flags.GrpcHooksBackoff, "hooks-grpc-backoff", 1, "Number of seconds to wait before retrying each retry")
-	flag.IntVar(&Flags.HooksStopUploadCode, "hooks-stop-code", 0, "Return code from post-receive hook which causes tusd to stop and delete the current upload. A zero value means that no uploads will be stopped")
-	flag.StringVar(&Flags.PluginHookPath, "hooks-plugin", "", "Path to a Go plugin for loading hook functions (only supported on Linux and macOS; highly EXPERIMENTAL and may BREAK in the future)")
 	flag.BoolVar(&Flags.ShowVersion, "version", false, "Print tusd version information")
 	flag.BoolVar(&Flags.ExposeMetrics, "expose-metrics", true, "Expose metrics about tusd usage")
 	flag.StringVar(&Flags.MetricsPath, "metrics-path", "/metrics", "Path under which the metrics endpoint will be accessible")
+	flag.BoolVar(&Flags.ExposePprof, "expose-pprof", false, "Expose the pprof interface over HTTP for profiling tusd")
+	flag.StringVar(&Flags.PprofPath, "pprof-path", "/debug/pprof/", "Path under which the pprof endpoint will be accessible")
+	flag.IntVar(&Flags.PprofBlockProfileRate, "pprof-block-profile-rate", 0, "Fraction of goroutine blocking events that are reported in the blocking profile")
+	flag.IntVar(&Flags.PprofMutexProfileRate, "pprof-mutex-profile-rate", 0, "Fraction of mutex contention events that are reported in the mutex profile")
 	flag.BoolVar(&Flags.BehindProxy, "behind-proxy", false, "Respect X-Forwarded-* and similar headers which may be set by proxies")
 	flag.BoolVar(&Flags.VerboseOutput, "verbose", true, "Enable verbose logging output")
 	flag.BoolVar(&Flags.S3TransferAcceleration, "s3-transfer-acceleration", false, "Use AWS S3 transfer acceleration endpoint (requires -s3-bucket option and Transfer Acceleration property on S3 bucket to be set)")
 	flag.StringVar(&Flags.TLSCertFile, "tls-certificate", "", "Path to the file containing the x509 TLS certificate to be used. The file should also contain any intermediate certificates and the CA certificate.")
 	flag.StringVar(&Flags.TLSKeyFile, "tls-key", "", "Path to the file containing the key for the TLS certificate.")
 	flag.StringVar(&Flags.TLSMode, "tls-mode", "tls12", "Specify which TLS mode to use; valid modes are tls13, tls12, and tls12-strong.")
-
-	flag.StringVar(&Flags.CPUProfile, "cpuprofile", "", "write cpu profile to file")
 	flag.Parse()
 
 	SetEnabledHooks()
@@ -115,20 +120,6 @@ func ParseFlags() {
 	if Flags.FileHooksDir != "" {
 		Flags.FileHooksDir, _ = filepath.Abs(Flags.FileHooksDir)
 	}
-
-	if Flags.CPUProfile != "" {
-		f, err := os.Create(Flags.CPUProfile)
-		if err != nil {
-			log.Fatal(err)
-		}
-		pprof.StartCPUProfile(f)
-
-		go func() {
-			<-time.After(20 * time.Second)
-			pprof.StopCPUProfile()
-			fmt.Println("Stopped CPU profile")
-		}()
-	}
 }
 
 func SetEnabledHooks() {

cmd/tusd/cli/hooks.go

@@ -1,7 +1,6 @@
 package cli
 
 import (
-	"fmt"
 	"strconv"
 	"strings"
 
@@ -20,27 +19,12 @@ func hookTypeInSlice(a hooks.HookType, list []hooks.HookType) bool {
 	return false
 }
 
-func hookCallback(typ hooks.HookType, info handler.HookEvent) error {
-	if output, err := invokeHookSync(typ, info, true); err != nil {
-		if hookErr, ok := err.(hooks.HookError); ok {
-			return hooks.NewHookError(
-				fmt.Errorf("%s hook failed: %s", typ, err),
-				hookErr.StatusCode(),
-				hookErr.Body(),
-			)
-		}
-		return fmt.Errorf("%s hook failed: %s\n%s", typ, err, string(output))
-	}
-
-	return nil
+func preCreateCallback(event handler.HookEvent) (handler.HTTPResponse, error) {
+	return invokeHookSync(hooks.HookPreCreate, event)
 }
 
-func preCreateCallback(info handler.HookEvent) error {
-	return hookCallback(hooks.HookPreCreate, info)
-}
-
-func preFinishCallback(info handler.HookEvent) error {
-	return hookCallback(hooks.HookPreFinish, info)
+func preFinishCallback(event handler.HookEvent) (handler.HTTPResponse, error) {
+	return invokeHookSync(hooks.HookPreFinish, event)
 }
 
 func SetupHookMetrics() {
@@ -50,6 +34,12 @@ func SetupHookMetrics() {
 	MetricsHookErrorsTotal.WithLabelValues(string(hooks.HookPostCreate)).Add(0)
 	MetricsHookErrorsTotal.WithLabelValues(string(hooks.HookPreCreate)).Add(0)
 	MetricsHookErrorsTotal.WithLabelValues(string(hooks.HookPreFinish)).Add(0)
+	MetricsHookInvocationsTotal.WithLabelValues(string(hooks.HookPostFinish)).Add(0)
+	MetricsHookInvocationsTotal.WithLabelValues(string(hooks.HookPostTerminate)).Add(0)
+	MetricsHookInvocationsTotal.WithLabelValues(string(hooks.HookPostReceive)).Add(0)
+	MetricsHookInvocationsTotal.WithLabelValues(string(hooks.HookPostCreate)).Add(0)
+	MetricsHookInvocationsTotal.WithLabelValues(string(hooks.HookPreCreate)).Add(0)
+	MetricsHookInvocationsTotal.WithLabelValues(string(hooks.HookPreFinish)).Add(0)
 }
 
 func SetupPreHooks(config *handler.Config) error {
@@ -107,33 +97,35 @@ func SetupPostHooks(handler *handler.Handler) {
 	go func() {
 		for {
 			select {
-			case info := <-handler.CompleteUploads:
-				invokeHookAsync(hooks.HookPostFinish, info)
-			case info := <-handler.TerminatedUploads:
-				invokeHookAsync(hooks.HookPostTerminate, info)
-			case info := <-handler.UploadProgress:
-				invokeHookAsync(hooks.HookPostReceive, info)
-			case info := <-handler.CreatedUploads:
-				invokeHookAsync(hooks.HookPostCreate, info)
+			case event := <-handler.CompleteUploads:
+				invokeHookAsync(hooks.HookPostFinish, event)
+			case event := <-handler.TerminatedUploads:
+				invokeHookAsync(hooks.HookPostTerminate, event)
+			case event := <-handler.UploadProgress:
+				invokeHookAsync(hooks.HookPostReceive, event)
+			case event := <-handler.CreatedUploads:
+				invokeHookAsync(hooks.HookPostCreate, event)
 			}
 		}
 	}()
 }
 
-func invokeHookAsync(typ hooks.HookType, info handler.HookEvent) {
+func invokeHookAsync(typ hooks.HookType, event handler.HookEvent) {
 	go func() {
 		// Error handling is taken care by the function.
-		_, _ = invokeHookSync(typ, info, false)
+		_, _ = invokeHookSync(typ, event)
 	}()
 }
 
-func invokeHookSync(typ hooks.HookType, info handler.HookEvent, captureOutput bool) ([]byte, error) {
+func invokeHookSync(typ hooks.HookType, event handler.HookEvent) (httpRes handler.HTTPResponse, err error) {
 	if !hookTypeInSlice(typ, Flags.EnabledHooks) {
-		return nil, nil
+		return httpRes, nil
 	}
 
-	id := info.Upload.ID
-	size := info.Upload.Size
+	MetricsHookInvocationsTotal.WithLabelValues(string(typ)).Add(1)
+
+	id := event.Upload.ID
+	size := event.Upload.Size
 
 	switch typ {
 	case hooks.HookPostFinish:
@@ -143,28 +135,43 @@ func invokeHookSync(typ hooks.HookType, info handler.HookEvent, captureOutput bo
 	}
 
 	if hookHandler == nil {
-		return nil, nil
+		return httpRes, nil
 	}
 
-	name := string(typ)
 	if Flags.VerboseOutput {
-		logEv(stdout, "HookInvocationStart", "type", name, "id", id)
+		logEv(stdout, "HookInvocationStart", "type", string(typ), "id", id)
 	}
 
-	output, returnCode, err := hookHandler.InvokeHook(typ, info, captureOutput)
+	hookRes, err := hookHandler.InvokeHook(hooks.HookRequest{
+		Type:  typ,
+		Event: event,
+	})
 
 	if err != nil {
 		logEv(stderr, "HookInvocationError", "type", string(typ), "id", id, "error", err.Error())
 		MetricsHookErrorsTotal.WithLabelValues(string(typ)).Add(1)
+		return httpRes, err
 	} else if Flags.VerboseOutput {
 		logEv(stdout, "HookInvocationFinish", "type", string(typ), "id", id)
 	}
 
-	if typ == hooks.HookPostReceive && Flags.HooksStopUploadCode != 0 && Flags.HooksStopUploadCode == returnCode {
-		logEv(stdout, "HookStopUpload", "id", id)
+	httpRes = hookRes.HTTPResponse
 
-		info.Upload.StopUpload()
+	// If the hook response includes the instruction to reject the upload, reuse the error code
+	// and message from ErrUploadRejectedByServer, but also include custom HTTP response values
+	if typ == hooks.HookPreCreate && hookRes.RejectUpload {
+		err := handler.ErrUploadRejectedByServer
+		err.HTTPResponse = err.HTTPResponse.MergeWith(httpRes)
+
+		return httpRes, err
 	}
 
-	return output, err
+	if typ == hooks.HookPostReceive && hookRes.StopUpload {
+		logEv(stdout, "HookStopUpload", "id", id)
+
+		// TODO: Control response for PATCH request
+		event.Upload.StopUpload()
+	}
+
+	return httpRes, err
 }

cmd/tusd/cli/hooks/file.go

@@ -3,11 +3,10 @@ package hooks
 import (
 	"bytes"
 	"encoding/json"
+	"fmt"
 	"os"
 	"os/exec"
 	"strconv"
-
-	"github.com/tus/tusd/pkg/handler"
 )
 
 type FileHook struct {
@@ -18,43 +17,50 @@ func (_ FileHook) Setup() error {
 	return nil
 }
 
-func (h FileHook) InvokeHook(typ HookType, info handler.HookEvent, captureOutput bool) ([]byte, int, error) {
-	hookPath := h.Directory + string(os.PathSeparator) + string(typ)
+func (h FileHook) InvokeHook(req HookRequest) (res HookResponse, err error) {
+	hookPath := h.Directory + string(os.PathSeparator) + string(req.Type)
 	cmd := exec.Command(hookPath)
 	env := os.Environ()
-	env = append(env, "TUS_ID="+info.Upload.ID)
-	env = append(env, "TUS_SIZE="+strconv.FormatInt(info.Upload.Size, 10))
-	env = append(env, "TUS_OFFSET="+strconv.FormatInt(info.Upload.Offset, 10))
+	env = append(env, "TUS_ID="+req.Event.Upload.ID)
+	env = append(env, "TUS_SIZE="+strconv.FormatInt(req.Event.Upload.Size, 10))
+	env = append(env, "TUS_OFFSET="+strconv.FormatInt(req.Event.Upload.Offset, 10))
 
-	jsonInfo, err := json.Marshal(info)
+	jsonReq, err := json.Marshal(req)
 	if err != nil {
-		return nil, 0, err
+		return res, err
 	}
 
-	reader := bytes.NewReader(jsonInfo)
+	reader := bytes.NewReader(jsonReq)
 	cmd.Stdin = reader
 
 	cmd.Env = env
 	cmd.Dir = h.Directory
 	cmd.Stderr = os.Stderr
 
-	// If `captureOutput` is true, this function will return the output (both,
-	// stderr and stdout), else it will use this process' stdout
-	var output []byte
-	if !captureOutput {
-		cmd.Stdout = os.Stdout
-		err = cmd.Run()
-	} else {
-		output, err = cmd.Output()
-	}
+	output, err := cmd.Output()
 
-	// Ignore the error, only, if the hook's file could not be found. This usually
+	// Ignore the error if the hook's file could not be found. This usually
 	// means that the user is only using a subset of the available hooks.
 	if os.IsNotExist(err) {
-		err = nil
+		return res, nil
 	}
 
-	returnCode := cmd.ProcessState.ExitCode()
+	// Report error if the exit code was non-zero
+	if err, ok := err.(*exec.ExitError); ok {
+		return res, fmt.Errorf("unexpected return code %d from hook endpoint: %s", err.ProcessState.ExitCode(), string(output))
+	}
 
-	return output, returnCode, err
+	if err != nil {
+		return res, err
+	}
+
+	// Do not parse the output as JSON, if we received no output to reduce possible
+	// errors.
+	if len(output) > 0 {
+		if err = json.Unmarshal(output, &res); err != nil {
+			return res, fmt.Errorf("failed to parse hook response: %w, response was: %s", err, string(output))
+		}
+	}
+
+	return res, nil
 }

cmd/tusd/cli/hooks/grpc.go

@@ -2,20 +2,19 @@ package hooks
 
 import (
 	"context"
+	"net/http"
 	"time"
 
 	grpc_retry "github.com/grpc-ecosystem/go-grpc-middleware/retry"
-	"github.com/tus/tusd/pkg/handler"
-	pb "github.com/tus/tusd/pkg/proto/v1"
+	pb "github.com/tus/tusd/pkg/proto/v2"
 	"google.golang.org/grpc"
-	"google.golang.org/grpc/status"
 )
 
 type GrpcHook struct {
 	Endpoint   string
 	MaxRetries int
 	Backoff    int
-	Client     pb.HookServiceClient
+	Client     pb.HookHandlerClient
 }
 
 func (g *GrpcHook) Setup() error {
@@ -31,44 +30,69 @@ func (g *GrpcHook) Setup() error {
 	if err != nil {
 		return err
 	}
-	g.Client = pb.NewHookServiceClient(conn)
+	g.Client = pb.NewHookHandlerClient(conn)
 	return nil
 }
 
-func (g *GrpcHook) InvokeHook(typ HookType, info handler.HookEvent, captureOutput bool) ([]byte, int, error) {
+func (g *GrpcHook) InvokeHook(hookReq HookRequest) (hookRes HookResponse, err error) {
 	ctx := context.Background()
-	req := &pb.SendRequest{Hook: marshal(typ, info)}
-	resp, err := g.Client.Send(ctx, req)
+	req := marshal(hookReq)
+	res, err := g.Client.InvokeHook(ctx, req)
 	if err != nil {
-		if e, ok := status.FromError(err); ok {
-			return nil, int(e.Code()), err
-		}
-		return nil, 2, err
+		return hookRes, err
 	}
-	if captureOutput {
-		return resp.Response.GetValue(), 0, err
-	}
-	return nil, 0, err
+
+	hookRes = unmarshal(res)
+	return hookRes, nil
 }
 
-func marshal(typ HookType, info handler.HookEvent) *pb.Hook {
-	return &pb.Hook{
-		Upload: &pb.Upload{
-			Id:             info.Upload.ID,
-			Size:           info.Upload.Size,
-			SizeIsDeferred: info.Upload.SizeIsDeferred,
-			Offset:         info.Upload.Offset,
-			MetaData:       info.Upload.MetaData,
-			IsPartial:      info.Upload.IsPartial,
-			IsFinal:        info.Upload.IsFinal,
-			PartialUploads: info.Upload.PartialUploads,
-			Storage:        info.Upload.Storage,
+func marshal(hookReq HookRequest) *pb.HookRequest {
+	event := hookReq.Event
+
+	return &pb.HookRequest{
+		Type: string(hookReq.Type),
+		Event: &pb.Event{
+			Upload: &pb.FileInfo{
+				Id:             event.Upload.ID,
+				Size:           event.Upload.Size,
+				SizeIsDeferred: event.Upload.SizeIsDeferred,
+				Offset:         event.Upload.Offset,
+				MetaData:       event.Upload.MetaData,
+				IsPartial:      event.Upload.IsPartial,
+				IsFinal:        event.Upload.IsFinal,
+				PartialUploads: event.Upload.PartialUploads,
+				Storage:        event.Upload.Storage,
+			},
+			HttpRequest: &pb.HTTPRequest{
+				Method:     event.HTTPRequest.Method,
+				Uri:        event.HTTPRequest.URI,
+				RemoteAddr: event.HTTPRequest.RemoteAddr,
+				Header:     getHeaders(event.HTTPRequest.Header),
+			},
 		},
-		HttpRequest: &pb.HTTPRequest{
-			Method:     info.HTTPRequest.Method,
-			Uri:        info.HTTPRequest.URI,
-			RemoteAddr: info.HTTPRequest.RemoteAddr,
-		},
-		Name: string(typ),
 	}
 }
+
+func getHeaders(httpHeader http.Header) (hookHeader map[string]string) {
+	hookHeader = make(map[string]string)
+	for key, val := range httpHeader {
+		if key != "" && val != nil && len(val) > 0 {
+			hookHeader[key] = val[0]
+		}
+	}
+	return hookHeader
+}
+
+func unmarshal(res *pb.HookResponse) (hookRes HookResponse) {
+	hookRes.RejectUpload = res.RejectUpload
+	hookRes.StopUpload = res.StopUpload
+
+	httpRes := res.HttpResponse
+	if httpRes != nil {
+		hookRes.HTTPResponse.StatusCode = int(httpRes.StatusCode)
+		hookRes.HTTPResponse.Headers = httpRes.Headers
+		hookRes.HTTPResponse.Body = httpRes.Body
+	}
+
+	return hookRes
+}

cmd/tusd/cli/hooks/hooks.go

@@ -1,12 +1,58 @@
 package hooks
 
+// TODO: Move hooks into a package in /pkg
+
 import (
 	"github.com/tus/tusd/pkg/handler"
 )
 
+// HookHandler is the main inferface to be implemented by all hook backends.
 type HookHandler interface {
+	// Setup is invoked once the hook backend is initalized.
 	Setup() error
-	InvokeHook(typ HookType, info handler.HookEvent, captureOutput bool) ([]byte, int, error)
+	// InvokeHook is invoked for every hook that is executed. req contains the
+	// corresponding information about the hook type, the involved upload, and
+	// causing HTTP request.
+	// The return value res allows to stop or reject an upload, as well as modifying
+	// the HTTP response. See the documentation for HookResponse for more details.
+	// If err is not nil, the value of res will be ignored. err should only be
+	// non-nil if the hook failed to complete successfully.
+	InvokeHook(req HookRequest) (res HookResponse, err error)
+}
+
+// HookRequest contains the information about the hook type, the involved upload,
+// and causing HTTP request.
+type HookRequest struct {
+	// Type is the name of the hook.
+	Type HookType
+	// Event contains the involved upload and causing HTTP request.
+	Event handler.HookEvent
+}
+
+// HookResponse is the response after a hook is executed.
+type HookResponse struct {
+	// HTTPResponse's fields can be filled to modify the HTTP response.
+	// This is only possible for pre-create, pre-finish and post-receive hooks.
+	// For other hooks this value is ignored.
+	// If multiple hooks modify the HTTP response, a later hook may overwrite the
+	// modified values from a previous hook (e.g. if multiple post-receive hooks
+	// are executed).
+	// Example usages: Send an error to the client if RejectUpload/StopUpload are
+	// set in the pre-create/post-receive hook. Send more information to the client
+	// in the pre-finish hook.
+	HTTPResponse handler.HTTPResponse
+
+	// RejectUpload will cause the upload to be rejected and not be created during
+	// POST request. This value is only respected for pre-create hooks. For other hooks,
+	// it is ignored. Use the HTTPResponse field to send details about the rejection
+	// to the client.
+	RejectUpload bool
+
+	// StopUpload will cause the upload to be stopped during a PATCH request.
+	// This value is only respected for post-receive hooks. For other hooks,
+	// it is ignored. Use the HTTPResponse field to send details about the stop
+	// to the client.
+	StopUpload bool
 }
 
 type HookType string
@@ -21,29 +67,3 @@ const (
 )
 
 var AvailableHooks []HookType = []HookType{HookPreCreate, HookPostCreate, HookPostReceive, HookPostTerminate, HookPostFinish, HookPreFinish}
-
-type hookDataStore struct {
-	handler.DataStore
-}
-
-type HookError struct {
-	error
-	statusCode int
-	body       []byte
-}
-
-func NewHookError(err error, statusCode int, body []byte) HookError {
-	return HookError{err, statusCode, body}
-}
-
-func (herr HookError) StatusCode() int {
-	return herr.statusCode
-}
-
-func (herr HookError) Body() []byte {
-	return herr.body
-}
-
-func (herr HookError) Error() string {
-	return herr.error.Error()
-}

cmd/tusd/cli/hooks/http.go

@@ -8,8 +8,6 @@ import (
 	"net/http"
 	"time"
 
-	"github.com/tus/tusd/pkg/handler"
-
 	"github.com/sethgrid/pester"
 )
 
@@ -18,35 +16,11 @@ type HttpHook struct {
 	MaxRetries     int
 	Backoff        int
 	ForwardHeaders []string
+
+	client *pester.Client
 }
 
-func (_ HttpHook) Setup() error {
-	return nil
-}
-
-func (h HttpHook) InvokeHook(typ HookType, info handler.HookEvent, captureOutput bool) ([]byte, int, error) {
-	jsonInfo, err := json.Marshal(info)
-	if err != nil {
-		return nil, 0, err
-	}
-
-	req, err := http.NewRequest("POST", h.Endpoint, bytes.NewBuffer(jsonInfo))
-	if err != nil {
-		return nil, 0, err
-	}
-
-	for _, k := range h.ForwardHeaders {
-		// Lookup the Canonicalised version of the specified header
-		if vals, ok := info.HTTPRequest.Header[http.CanonicalHeaderKey(k)]; ok {
-			// but set the case specified by the user
-			req.Header[k] = vals
-		}
-	}
-
-	req.Header.Set("Hook-Name", string(typ))
-	req.Header.Set("Content-Type", "application/json")
-
-	// TODO: Can we initialize this in Setup()?
+func (h *HttpHook) Setup() error {
 	// Use linear backoff strategy with the user defined values.
 	client := pester.New()
 	client.KeepLog = true
@@ -55,24 +29,51 @@ func (h HttpHook) InvokeHook(typ HookType, info handler.HookEvent, captureOutput
 		return time.Duration(h.Backoff) * time.Second
 	}
 
-	resp, err := client.Do(req)
-	if err != nil {
-		return nil, 0, err
-	}
-	defer resp.Body.Close()
+	h.client = client
 
-	body, err := ioutil.ReadAll(resp.Body)
-	if err != nil {
-		return nil, 0, err
-	}
-
-	if resp.StatusCode >= http.StatusBadRequest {
-		return body, resp.StatusCode, NewHookError(fmt.Errorf("endpoint returned: %s", resp.Status), resp.StatusCode, body)
-	}
-
-	if captureOutput {
-		return body, resp.StatusCode, err
-	}
-
-	return nil, resp.StatusCode, err
+	return nil
+}
+
+func (h HttpHook) InvokeHook(hookReq HookRequest) (hookRes HookResponse, err error) {
+	jsonInfo, err := json.Marshal(hookReq)
+	if err != nil {
+		return hookRes, err
+	}
+
+	httpReq, err := http.NewRequest("POST", h.Endpoint, bytes.NewBuffer(jsonInfo))
+	if err != nil {
+		return hookRes, err
+	}
+
+	for _, k := range h.ForwardHeaders {
+		// Lookup the Canonicalised version of the specified header
+		if vals, ok := hookReq.Event.HTTPRequest.Header[http.CanonicalHeaderKey(k)]; ok {
+			// but set the case specified by the user
+			httpReq.Header[k] = vals
+		}
+	}
+
+	httpReq.Header.Set("Content-Type", "application/json")
+
+	httpRes, err := h.client.Do(httpReq)
+	if err != nil {
+		return hookRes, err
+	}
+	defer httpRes.Body.Close()
+
+	httpBody, err := ioutil.ReadAll(httpRes.Body)
+	if err != nil {
+		return hookRes, err
+	}
+
+	// Report an error, if the response has a non-2XX status code
+	if httpRes.StatusCode < http.StatusOK || httpRes.StatusCode >= http.StatusMultipleChoices {
+		return hookRes, fmt.Errorf("unexpected response code from hook endpoint (%d): %s", httpRes.StatusCode, string(httpBody))
+	}
+
+	if err = json.Unmarshal(httpBody, &hookRes); err != nil {
+		return hookRes, fmt.Errorf("failed to parse hook response: %w", err)
+	}
+
+	return hookRes, nil
 }

cmd/tusd/cli/hooks/plugin.go

@@ -1,69 +1,122 @@
 package hooks
 
 import (
-	"fmt"
-	"plugin"
+	"log"
+	"net/rpc"
+	"os"
+	"os/exec"
 
-	"github.com/tus/tusd/pkg/handler"
+	"github.com/hashicorp/go-plugin"
 )
 
-type PluginHookHandler interface {
-	PreCreate(info handler.HookEvent) error
-	PostCreate(info handler.HookEvent) error
-	PostReceive(info handler.HookEvent) error
-	PostFinish(info handler.HookEvent) error
-	PostTerminate(info handler.HookEvent) error
-	PreFinish(info handler.HookEvent) error
-}
+// TODO: When the tusd process stops, the plugin does not get properly killed
+// and lives on as a zombie process.
 
 type PluginHook struct {
 	Path string
 
-	handler PluginHookHandler
+	handlerImpl HookHandler
 }
 
 func (h *PluginHook) Setup() error {
-	p, err := plugin.Open(h.Path)
+	// We're a host! Start by launching the plugin process.
+	client := plugin.NewClient(&plugin.ClientConfig{
+		HandshakeConfig: handshakeConfig,
+		Plugins:         pluginMap,
+		Cmd:             exec.Command(h.Path),
+		SyncStdout:      os.Stdout,
+		SyncStderr:      os.Stderr,
+		//Logger:          logger,
+	})
+	//defer client.Kill()
+
+	// Connect via RPC
+	rpcClient, err := client.Client()
 	if err != nil {
-		return err
+		log.Fatal(err)
 	}
 
-	symbol, err := p.Lookup("TusdHookHandler")
+	// Request the plugin
+	raw, err := rpcClient.Dispense("hookHandler")
 	if err != nil {
-		return err
+		log.Fatal(err)
 	}
 
-	handler, ok := symbol.(*PluginHookHandler)
-	if !ok {
-		return fmt.Errorf("hooks: could not cast TusdHookHandler from %s into PluginHookHandler interface", h.Path)
-	}
+	// We should have a HookHandler now! This feels like a normal interface
+	// implementation but is in fact over an RPC connection.
+	h.handlerImpl = raw.(HookHandler)
 
-	h.handler = *handler
-	return nil
+	return h.handlerImpl.Setup()
 }
 
-func (h PluginHook) InvokeHook(typ HookType, info handler.HookEvent, captureOutput bool) ([]byte, int, error) {
-	var err error
-	switch typ {
-	case HookPostFinish:
-		err = h.handler.PostFinish(info)
-	case HookPostTerminate:
-		err = h.handler.PostTerminate(info)
-	case HookPostReceive:
-		err = h.handler.PostReceive(info)
-	case HookPostCreate:
-		err = h.handler.PostCreate(info)
-	case HookPreCreate:
-		err = h.handler.PreCreate(info)
-	case HookPreFinish:
-		err = h.handler.PreFinish(info)
-	default:
-		err = fmt.Errorf("hooks: unknown hook named %s", typ)
-	}
-
-	if err != nil {
-		return nil, 1, err
-	}
-
-	return nil, 0, nil
+func (h *PluginHook) InvokeHook(req HookRequest) (HookResponse, error) {
+	return h.handlerImpl.InvokeHook(req)
+}
+
+// handshakeConfigs are used to just do a basic handshake between
+// a plugin and host. If the handshake fails, a user friendly error is shown.
+// This prevents users from executing bad plugins or executing a plugin
+// directory. It is a UX feature, not a security feature.
+var handshakeConfig = plugin.HandshakeConfig{
+	ProtocolVersion:  1,
+	MagicCookieKey:   "TUSD_PLUGIN",
+	MagicCookieValue: "yes",
+}
+
+// pluginMap is the map of plugins we can dispense.
+var pluginMap = map[string]plugin.Plugin{
+	"hookHandler": &HookHandlerPlugin{},
+}
+
+// Here is an implementation that talks over RPC
+type HookHandlerRPC struct{ client *rpc.Client }
+
+func (g *HookHandlerRPC) Setup() error {
+	var res interface{}
+	err := g.client.Call("Plugin.Setup", new(interface{}), &res)
+	return err
+}
+
+func (g *HookHandlerRPC) InvokeHook(req HookRequest) (res HookResponse, err error) {
+	err = g.client.Call("Plugin.InvokeHook", req, &res)
+	return res, err
+}
+
+// Here is the RPC server that HookHandlerRPC talks to, conforming to
+// the requirements of net/rpc
+type HookHandlerRPCServer struct {
+	// This is the real implementation
+	Impl HookHandler
+}
+
+func (s *HookHandlerRPCServer) Setup(args interface{}, resp *interface{}) error {
+	return s.Impl.Setup()
+}
+
+func (s *HookHandlerRPCServer) InvokeHook(args HookRequest, resp *HookResponse) (err error) {
+	*resp, err = s.Impl.InvokeHook(args)
+	return err
+}
+
+// This is the implementation of plugin.Plugin so we can serve/consume this
+//
+// This has two methods: Server must return an RPC server for this plugin
+// type. We construct a HookHandlerRPCServer for this.
+//
+// Client must return an implementation of our interface that communicates
+// over an RPC client. We return HookHandlerRPC for this.
+//
+// Ignore MuxBroker. That is used to create more multiplexed streams on our
+// plugin connection and is a more advanced use case.
+type HookHandlerPlugin struct {
+	// Impl Injection
+	Impl HookHandler
+}
+
+func (p *HookHandlerPlugin) Server(*plugin.MuxBroker) (interface{}, error) {
+	return &HookHandlerRPCServer{Impl: p.Impl}, nil
+}
+
+func (HookHandlerPlugin) Client(b *plugin.MuxBroker, c *rpc.Client) (interface{}, error) {
+	return &HookHandlerRPC{client: c}, nil
 }

cmd/tusd/cli/hooks/proto/v1/hook.proto

@@ -1,77 +0,0 @@
-// If this file gets changed, you must recompile the generate package in pkg/proto.
-// To do this, install the Go protobuf toolchain as mentioned in
-// https://github.com/golang/protobuf#installation.
-// Then use following command to recompile it with gRPC support:
-//   protoc --go_out=plugins=grpc:../../../../../pkg/proto/ v1/hook.proto
-// In addition, it may be necessary to update the protobuf or gRPC dependencies as well.
-
-syntax = "proto3";
-package v1;
-
-import "google/protobuf/any.proto";
-
-// Uploaded data
-message Upload {
-	// Unique integer identifier of the uploaded file
-	string id = 1;
-	// Total file size in bytes specified in the NewUpload call
-	int64 Size = 2; 
-	// Indicates whether the total file size is deferred until later
-	bool SizeIsDeferred = 3;
-	// Offset in bytes (zero-based)
-	int64 Offset = 4;
-	map<string, string> metaData = 5;
-	// Indicates that this is a partial upload which will later be used to form
-	// a final upload by concatenation. Partial uploads should not be processed
-	// when they are finished since they are only incomplete chunks of files.
-	bool isPartial = 6; 
-	// Indicates that this is a final upload
-	bool isFinal = 7; 
-	// If the upload is a final one (see IsFinal) this will be a non-empty
-	// ordered slice containing the ids of the uploads of which the final upload
-	// will consist after concatenation.
-	repeated string partialUploads = 8;
-	// Storage contains information about where the data storage saves the upload,
-	// for example a file path. The available values vary depending on what data
-	// store is used. This map may also be nil.
-	map <string, string> storage = 9;
-}
-
-message HTTPRequest {
-	// Method is the HTTP method, e.g. POST or PATCH
-	string method = 1;
-	// URI is the full HTTP request URI, e.g. /files/fooo
-	string uri = 2;
-	// RemoteAddr contains the network address that sent the request
-	string remoteAddr = 3; 
-}
-
-// Hook's data
-message Hook {
-	// Upload contains information about the upload that caused this hook
-	// to be fired.
-	Upload upload = 1;
-	// HTTPRequest contains details about the HTTP request that reached
-	// tusd.
-	HTTPRequest httpRequest = 2;
-	// The hook name
-	string name = 3;
-}
-
-// Request data to send hook
-message SendRequest {
-  // The hook data
-  Hook hook = 1;
-}
-
-// Response that contains data for sended hook
-message SendResponse {
-  // The response of the hook.
-  google.protobuf.Any response = 1;
-}
-
-// The hook service definition.
-service HookService {
-  // Sends a hook
-  rpc Send (SendRequest) returns (SendResponse) {}
-}

cmd/tusd/cli/hooks/proto/v2/hook.proto

@@ -0,0 +1,116 @@
+// If this file gets changed, you must recompile the generate package in pkg/proto.
+// To do this, install the Go protobuf toolchain as mentioned in
+// https://github.com/golang/protobuf#installation.
+// Then use following command to recompile it with gRPC support:
+//   protoc --go_out=plugins=grpc:../../../../../pkg/proto/ v2/hook.proto
+// In addition, it may be necessary to update the protobuf or gRPC dependencies as well.
+
+syntax = "proto3";
+package v2;
+
+// HookRequest contains the information about the hook type, the involved upload,
+// and causing HTTP request.
+message HookRequest {
+	// Type is the name of the hook.
+	string type = 1;
+	
+	// Event contains the involved upload and causing HTTP request.
+	Event event = 2;
+}
+
+// Event represents an event from tusd which can be handled by the application.
+message Event {
+	// Upload contains information about the upload that caused this hook
+	// to be fired.
+	FileInfo upload = 1;
+
+	// HTTPRequest contains details about the HTTP request that reached
+	// tusd.
+	HTTPRequest httpRequest = 2;
+}
+
+// FileInfo contains information about a single upload resource.
+message FileInfo {
+	// ID is the unique identifier of the upload resource.
+	string id = 1;
+	// Total file size in bytes specified in the NewUpload call
+	int64 size = 2; 
+	// Indicates whether the total file size is deferred until later
+	bool sizeIsDeferred = 3;
+	// Offset in bytes (zero-based)
+	int64 offset = 4;
+	map<string, string> metaData = 5;
+	// Indicates that this is a partial upload which will later be used to form
+	// a final upload by concatenation. Partial uploads should not be processed
+	// when they are finished since they are only incomplete chunks of files.
+	bool isPartial = 6; 
+	// Indicates that this is a final upload
+	bool isFinal = 7; 
+	// If the upload is a final one (see IsFinal) this will be a non-empty
+	// ordered slice containing the ids of the uploads of which the final upload
+	// will consist after concatenation.
+	repeated string partialUploads = 8;
+	// Storage contains information about where the data storage saves the upload,
+	// for example a file path. The available values vary depending on what data
+	// store is used. This map may also be nil.
+	map <string, string> storage = 9;
+}
+
+// HTTPRequest contains basic details of an incoming HTTP request.
+message HTTPRequest {
+	// Method is the HTTP method, e.g. POST or PATCH.
+	string method = 1;
+	// URI is the full HTTP request URI, e.g. /files/fooo.
+	string uri = 2;
+	// RemoteAddr contains the network address that sent the request.
+	string remoteAddr = 3; 
+	// Header contains all HTTP headers as present in the HTTP request.
+	map <string, string> header = 4;
+}
+
+// HookResponse is the response after a hook is executed.
+message HookResponse {
+// HTTPResponse's fields can be filled to modify the HTTP response.
+	// This is only possible for pre-create, pre-finish and post-receive hooks.
+	// For other hooks this value is ignored.
+	// If multiple hooks modify the HTTP response, a later hook may overwrite the
+	// modified values from a previous hook (e.g. if multiple post-receive hooks
+	// are executed).
+	// Example usages: Send an error to the client if RejectUpload/StopUpload are
+	// set in the pre-create/post-receive hook. Send more information to the client
+	// in the pre-finish hook.
+	HTTPResponse httpResponse = 1;
+
+	// RejectUpload will cause the upload to be rejected and not be created during
+	// POST request. This value is only respected for pre-create hooks. For other hooks,
+	// it is ignored. Use the HTTPResponse field to send details about the rejection
+	// to the client.
+	bool rejectUpload = 2;
+
+	// StopUpload will cause the upload to be stopped during a PATCH request.
+	// This value is only respected for post-receive hooks. For other hooks,
+	// it is ignored. Use the HTTPResponse field to send details about the stop
+	// to the client.
+	bool stopUpload = 3;
+}
+
+// HTTPResponse contains basic details of an outgoing HTTP response.
+message HTTPResponse {
+	// StatusCode is status code, e.g. 200 or 400.
+	int64 statusCode = 1;
+	// Headers contains additional HTTP headers for the response.
+	map <string, string> headers = 2;
+	// Body is the response body.
+	string body = 3;
+}
+
+
+// The hook service definition.
+service HookHandler {
+  // InvokeHook is invoked for every hook that is executed. HookRequest contains the
+	// corresponding information about the hook type, the involved upload, and
+	// causing HTTP request.
+	// The return value HookResponse allows to stop or reject an upload, as well as modifying
+	// the HTTP response. See the documentation for HookResponse for more details.
+  rpc InvokeHook (HookRequest) returns (HookResponse) {}
+}

cmd/tusd/cli/metrics.go

@@ -23,11 +23,20 @@ var MetricsHookErrorsTotal = prometheus.NewCounterVec(
 	[]string{"hooktype"},
 )
 
-func SetupMetrics(handler *handler.Handler) {
+var MetricsHookInvocationsTotal = prometheus.NewCounterVec(
+	prometheus.CounterOpts{
+		Name: "tusd_hook_invocations_total",
+		Help: "Total number of invocations per hook type.",
+	},
+	[]string{"hooktype"},
+)
+
+func SetupMetrics(mux *http.ServeMux, handler *handler.Handler) {
 	prometheus.MustRegister(MetricsOpenConnections)
 	prometheus.MustRegister(MetricsHookErrorsTotal)
+	prometheus.MustRegister(MetricsHookInvocationsTotal)
 	prometheus.MustRegister(prometheuscollector.New(handler.Metrics))
 
 	stdout.Printf("Using %s as the metrics path.\n", Flags.MetricsPath)
-	http.Handle(Flags.MetricsPath, promhttp.Handler())
+	mux.Handle(Flags.MetricsPath, promhttp.Handler())
 }

cmd/tusd/cli/pprof.go

@@ -0,0 +1,40 @@
+package cli
+
+import (
+	"net/http"
+	"net/http/pprof"
+	"os"
+	"runtime"
+	"strings"
+
+	"github.com/bmizerany/pat"
+	"github.com/felixge/fgprof"
+	"github.com/goji/httpauth"
+)
+
+func SetupPprof(globalMux *http.ServeMux) {
+	runtime.SetBlockProfileRate(Flags.PprofBlockProfileRate)
+	runtime.SetMutexProfileFraction(Flags.PprofMutexProfileRate)
+
+	mux := pat.New()
+	mux.Get("", http.HandlerFunc(pprof.Index))
+	mux.Get("cmdline", http.HandlerFunc(pprof.Cmdline))
+	mux.Get("profile", http.HandlerFunc(pprof.Profile))
+	mux.Get("symbol", http.HandlerFunc(pprof.Symbol))
+	mux.Get("trace", http.HandlerFunc(pprof.Trace))
+	mux.Get("fgprof", fgprof.Handler())
+
+	var handler http.Handler = mux
+	auth := os.Getenv("TUSD_PPROF_AUTH")
+	if auth != "" {
+		parts := strings.SplitN(auth, ":", 2)
+		if len(parts) != 2 {
+			stderr.Fatalf("TUSD_PPROF_AUTH must be two values separated by a colon")
+		}
+
+		handler = httpauth.SimpleBasicAuth(parts[0], parts[1])(mux)
+	}
+
+	globalMux.Handle(Flags.PprofPath, http.StripPrefix(Flags.PprofPath, handler))
+
+}

cmd/tusd/cli/serve.go

@@ -34,6 +34,7 @@ func Serve() {
 		NotifyTerminatedUploads: true,
 		NotifyUploadProgress:    true,
 		NotifyCreatedUploads:    true,
+		UploadProgressInterval:  time.Duration(Flags.ProgressHooksInterval) * time.Millisecond,
 	}
 
 	if err := SetupPreHooks(&config); err != nil {
@@ -60,21 +61,17 @@ func Serve() {
 
 	SetupPostHooks(handler)
 
-	if Flags.ExposeMetrics {
-		SetupMetrics(handler)
-		SetupHookMetrics()
-	}
-
 	stdout.Printf("Supported tus extensions: %s\n", handler.SupportedExtensions())
 
+	mux := http.NewServeMux()
 	if basepath == "/" {
 		// If the basepath is set to the root path, only install the tusd handler
 		// and do not show a greeting.
-		http.Handle("/", http.StripPrefix("/", handler))
+		mux.Handle("/", http.StripPrefix("/", handler))
 	} else {
 		// If a custom basepath is defined, we show a greeting at the root path...
 		if Flags.ShowGreeting {
-			http.HandleFunc("/", DisplayGreeting)
+			mux.HandleFunc("/", DisplayGreeting)
 		}
 
 		// ... and register a route with and without the trailing slash, so we can
@@ -82,8 +79,17 @@ func Serve() {
 		basepathWithoutSlash := strings.TrimSuffix(basepath, "/")
 		basepathWithSlash := basepathWithoutSlash + "/"
 
-		http.Handle(basepathWithSlash, http.StripPrefix(basepathWithSlash, handler))
-		http.Handle(basepathWithoutSlash, http.StripPrefix(basepathWithoutSlash, handler))
+		mux.Handle(basepathWithSlash, http.StripPrefix(basepathWithSlash, handler))
+		mux.Handle(basepathWithoutSlash, http.StripPrefix(basepathWithoutSlash, handler))
+	}
+
+	if Flags.ExposeMetrics {
+		SetupMetrics(mux, handler)
+		SetupHookMetrics()
+	}
+
+	if Flags.ExposePprof {
+		SetupPprof(mux)
 	}
 
 	var listener net.Listener
@@ -110,14 +116,17 @@ func Serve() {
 
 	// If we're not using TLS just start the server and, if http.Serve() returns, just return.
 	if protocol == "http" {
-		if err = http.Serve(listener, nil); err != nil {
+		if err = http.Serve(listener, mux); err != nil {
 			stderr.Fatalf("Unable to serve: %s", err)
 		}
 		return
 	}
 
+	// TODO: Move TLS handling into own file.
 	// Fall-through for TLS mode.
-	server := &http.Server{}
+	server := &http.Server{
+		Handler: mux,
+	}
 	switch Flags.TLSMode {
 	case TLS13:
 		server.TLSConfig = &tls.Config{MinVersion: tls.VersionTLS13}

docker/load-tests/1_run-test.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+# Setup traps, so our background job of monitoring the containers
+# exits, if the script is complete.
+trap "exit" INT TERM ERR
+trap "kill 0" EXIT
+
+# 1) Ensure that the containers are up-to-date
+docker compose build
+
+# 2) Start the container monitoring
+docker stats --format "{{ json . }}" > resource-usage-log.txt &
+
+# 3) Run the actual tests
+docker compose up --abort-on-container-exit

docker/load-tests/2_plot_resource_usage.py

@@ -0,0 +1,123 @@
+#!/usr/bin/env python3
+
+import json
+import re
+import matplotlib.pyplot as plt
+
+snapshots = []
+
+with open("./resource-usage-log.txt") as file:
+  current_snapshot = None
+  for line in file:
+    # The lines might contain the reset characters before the actual JSON.
+    # This means that the entire resources for the current time have been
+    # written out, so we add the latest snapshot to our list and continue
+    # reading the next entries.
+    first_backet = line.find("{")
+    if first_backet == -1:
+      continue
+
+    if first_backet != 0:
+      if current_snapshot is not None:
+        snapshots.append(current_snapshot)
+
+      current_snapshot = []
+      line = line[first_backet:]
+
+    current_snapshot.append(json.loads(line))
+
+def parse_percentage(string):
+  return float(string.strip('%'))
+
+units = {"B": 1, "kB": 10**3, "MB": 10**6, "GB": 10**9, "TB": 10**12,
+         "KiB": 2**10, "MiB": 2**20, "GiB": 2**30, "TiB": 2**40}
+
+def parse_byte_size(size):
+  number, unit = re.findall(r'([0-9\.]+)([A-Za-z]+)', size)[0]
+  return int(float(number)*units[unit])
+
+def parse_two_bytes(string):
+  str1, str2 = string.split("/")
+  return parse_byte_size(str1), parse_byte_size(str2)
+
+s3_cpu = []
+s3_mem = []
+tusd_cpu = []
+tusd_mem = []
+tusd_net = []
+uploader_cpu = []
+uploader_mem = []
+uploader_net = []
+timestamp = []
+
+for (i, snapshot) in enumerate(snapshots):
+  a_s3_cpu = None
+  a_s3_mem = None
+  a_tusd_cpu = None
+  a_tusd_mem = None
+  a_tusd_net = None
+  a_uploader_cpu = None
+  a_uploader_mem = None
+  a_uploader_net = None
+
+  for entry in snapshot:
+    if entry["Name"] == "load-tests-tusd-1":
+      a_tusd_cpu = parse_percentage(entry["CPUPerc"])
+      a_tusd_mem = parse_two_bytes(entry["MemUsage"])[0]
+      a_tusd_net = parse_two_bytes(entry["NetIO"])[0]
+    elif entry["Name"] == "load-tests-s3-1":
+      a_s3_cpu = parse_percentage(entry["CPUPerc"])
+      a_s3_mem = parse_two_bytes(entry["MemUsage"])[0]
+    elif entry["Name"] == "load-tests-uploader-1":
+      a_uploader_cpu = parse_percentage(entry["CPUPerc"])
+      a_uploader_mem = parse_two_bytes(entry["MemUsage"])[0]
+      a_uploader_net = parse_two_bytes(entry["NetIO"])[1]
+
+  s3_cpu.append(a_s3_cpu)
+  s3_mem.append(a_s3_mem)
+  tusd_cpu.append(a_tusd_cpu)
+  tusd_mem.append(a_tusd_mem)
+  tusd_net.append(a_tusd_net)
+  uploader_cpu.append(a_uploader_cpu)
+  uploader_mem.append(a_uploader_mem)
+  uploader_net.append(a_uploader_net)
+
+  # The docker stats command is hard coded to output stats every 500ms:
+  # https://github.com/docker/cli/blob/81c68913e4c2cb058b5a9fd5972e2989d9915b2c/cli/command/container/stats.go#L223
+  timestamp.append(0.5 * i)
+
+fig, axs = plt.subplots(3, 3, sharex=True, sharey='row')
+axs[0, 0].plot(timestamp, tusd_cpu)
+axs[0, 0].set_title('tusd CPU percentage')
+axs[0, 0].set(ylabel='CPU perc', xlabel='time')
+axs[0, 1].plot(timestamp, s3_cpu)
+axs[0, 1].set_title('s3 CPU percentage')
+axs[0, 1].set(ylabel='CPU perc', xlabel='time')
+axs[0, 2].plot(timestamp, uploader_cpu)
+axs[0, 2].set_title('uploader CPU percentage')
+axs[0, 2].set(ylabel='CPU perc', xlabel='time')
+
+axs[1, 0].plot(timestamp, tusd_mem)
+axs[1, 0].set_title('tusd memory usage')
+axs[1, 0].set(ylabel='mem perc', xlabel='time')
+axs[1, 1].plot(timestamp, s3_mem)
+axs[1, 1].set_title('s3 memory usage')
+axs[1, 1].set(ylabel='mem perc', xlabel='time')
+axs[1, 2].plot(timestamp, uploader_mem)
+axs[1, 2].set_title('uploader memory usage')
+axs[1, 2].set(ylabel='mem perc', xlabel='time')
+
+axs[2, 0].plot(timestamp, tusd_net)
+axs[2, 0].set_title('tusd network input')
+axs[2, 0].set(ylabel='total volume', xlabel='time')
+axs[2, 1].axis('off')
+axs[2, 2].plot(timestamp, uploader_net)
+axs[2, 2].set_title('uploader network output')
+axs[2, 2].set(ylabel='total volume', xlabel='time')
+
+
+# Hide x labels and tick labels for top plots and y ticks for right plots.
+for ax in axs.flat:
+    ax.label_outer()
+
+plt.show()

docker/load-tests/README.md

@@ -0,0 +1,3 @@
+## Load issues with tusd & S3
+
+This 

docker/load-tests/docker-compose.yml

@@ -0,0 +1,68 @@
+version: "3.9"
+
+# TODO:
+# - Add service for monitoring tusd
+# - Add hooks
+# - Use similar configuration as api2
+
+services:
+  s3:
+    image: minio/minio
+    ports:
+      - "9000:9000"
+      - "9001:9001"
+    # Note: Data directory is not persistent on purpose
+    command: server /data --console-address ":9001"
+    environment:
+      MINIO_ROOT_USER: minioadmin
+      MINIO_ROOT_PASSWORD: minioadmin
+    # deploy:
+    #   resources:
+    #     limits:
+    #       cpus: "2"
+
+  createbucket:
+    image: minio/mc
+    entrypoint: >
+      /bin/sh -c "
+      /usr/bin/mc config host add s3 http://s3:9000 minioadmin minioadmin;
+      /usr/bin/mc mb --ignore-existing s3/tusdtest.transloadit.com;
+      sleep infinity;
+      "
+    depends_on:
+      - s3
+
+  tusd:
+    build: ../../
+    ports:
+      - "1080:1080"
+    # entrypoint: file /srv/tusdhook/hook_handler
+    entrypoint: tusd -s3-bucket "tusdtest.transloadit.com" -s3-endpoint "http://s3:9000" -hooks-plugin=/usr/local/bin/hooks_handler -hooks-enabled-events=pre-create,post-create,post-receive,post-finish -progress-hooks-interval=3000 -max-size=128849018880 -timeout=60000 -s3-disable-content-hashes=true -s3-disable-ssl=true -s3-concurrent-part-uploads=48 -s3-max-buffered-parts=1
+    environment:
+      AWS_REGION: us-east-1
+      AWS_ACCESS_KEY_ID: minioadmin
+      AWS_SECRET_ACCESS_KEY: minioadmin
+    depends_on:
+      - s3
+      - createbucket
+    volumes:
+      - ../../examples/hooks/plugin:/srv/tusdhook
+    deploy:
+      resources:
+        limits:
+          cpus: "2"
+
+  uploader:
+    build: ./uploader
+    #   10 MiB: 10485760
+    #  100 MiB: 104857600
+    # 1000 MiB: 1048576000
+    command: 10485760 50 /dev/shm
+    tmpfs:
+      - /dev/shm
+    depends_on:
+      - tusd
+    # deploy:
+    #   resources:
+    #     limits:
+    #       cpus: "1"

docker/load-tests/resource-usage-log.txt

@@ -0,0 +1,69 @@
+{"BlockIO":"0B / 0B","CPUPerc":"0.00%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"0.05%","MemUsage":"8.633MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"220B / 0B","PIDs":"9"}
+{"BlockIO":"0B / 0B","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"","MemPerc":"0.00%","MemUsage":"0B / 0B","Name":"--","NetIO":"0B / 0B","PIDs":"0"}
+{"BlockIO":"0B / 0B","CPUPerc":"0.00%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"0.05%","MemUsage":"8.633MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"220B / 0B","PIDs":"9"}
+{"BlockIO":"0B / 0B","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"","MemPerc":"0.00%","MemUsage":"0B / 0B","Name":"--","NetIO":"0B / 0B","PIDs":"0"}
+{"BlockIO":"0B / 0B","CPUPerc":"0.00%","Container":"045ce1160eb0","ID":"","MemPerc":"0.00%","MemUsage":"0B / 0B","Name":"--","NetIO":"0B / 0B","PIDs":"0"}
+{"BlockIO":"115kB / 4.1kB","CPUPerc":"34.90%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"0.57%","MemUsage":"90.34MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"10.2kB / 3.43kB","PIDs":"13"}
+{"BlockIO":"213kB / 4.1kB","CPUPerc":"0.01%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"2.41kB / 1.76kB","PIDs":"2"}
+{"BlockIO":"0B / 0B","CPUPerc":"0.00%","Container":"045ce1160eb0","ID":"045ce1160eb0","MemPerc":"0.08%","MemUsage":"12.74MiB / 15.47GiB","Name":"load-tests-tusd-1","NetIO":"90B / 0B","PIDs":"19"}
+{"BlockIO":"0B / 0B","CPUPerc":"0.00%","Container":"e4e5ae23b118","ID":"","MemPerc":"0.00%","MemUsage":"0B / 0B","Name":"--","NetIO":"0B / 0B","PIDs":"0"}
+{"BlockIO":"115kB / 4.1kB","CPUPerc":"34.90%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"0.57%","MemUsage":"90.34MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"10.2kB / 3.43kB","PIDs":"13"}
+{"BlockIO":"213kB / 4.1kB","CPUPerc":"0.01%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"2.41kB / 1.76kB","PIDs":"2"}
+{"BlockIO":"0B / 0B","CPUPerc":"0.00%","Container":"045ce1160eb0","ID":"045ce1160eb0","MemPerc":"0.08%","MemUsage":"12.74MiB / 15.47GiB","Name":"load-tests-tusd-1","NetIO":"90B / 0B","PIDs":"19"}
+{"BlockIO":"0B / 0B","CPUPerc":"0.00%","Container":"e4e5ae23b118","ID":"","MemPerc":"0.00%","MemUsage":"0B / 0B","Name":"--","NetIO":"0B / 0B","PIDs":"0"}
+{"BlockIO":"225kB / 209kB","CPUPerc":"97.82%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"1.34%","MemUsage":"212.4MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"212kB / 128kB","PIDs":"15"}
+{"BlockIO":"213kB / 4.1kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"3.76kB / 1.76kB","PIDs":"2"}
+{"BlockIO":"0B / 0B","CPUPerc":"17.92%","Container":"045ce1160eb0","ID":"045ce1160eb0","MemPerc":"0.16%","MemUsage":"25.36MiB / 15.47GiB","Name":"load-tests-tusd-1","NetIO":"180kB / 237kB","PIDs":"19"}
+{"BlockIO":"0B / 0B","CPUPerc":"0.06%","Container":"e4e5ae23b118","ID":"e4e5ae23b118","MemPerc":"3.75%","MemUsage":"593.7MiB / 15.47GiB","Name":"load-tests-uploader-1","NetIO":"36kB / 54.2kB","PIDs":"51"}
+{"BlockIO":"225kB / 209kB","CPUPerc":"97.82%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"1.34%","MemUsage":"212.4MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"212kB / 128kB","PIDs":"15"}
+{"BlockIO":"213kB / 4.1kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"3.76kB / 1.76kB","PIDs":"2"}
+{"BlockIO":"0B / 0B","CPUPerc":"17.92%","Container":"045ce1160eb0","ID":"045ce1160eb0","MemPerc":"0.16%","MemUsage":"25.36MiB / 15.47GiB","Name":"load-tests-tusd-1","NetIO":"180kB / 237kB","PIDs":"19"}
+{"BlockIO":"0B / 0B","CPUPerc":"0.06%","Container":"e4e5ae23b118","ID":"e4e5ae23b118","MemPerc":"3.75%","MemUsage":"593.7MiB / 15.47GiB","Name":"load-tests-uploader-1","NetIO":"36kB / 54.2kB","PIDs":"51"}
+{"BlockIO":"373kB / 189MB","CPUPerc":"637.26%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.59%","MemUsage":"568.3MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"254MB / 303kB","PIDs":"28"}
+{"BlockIO":"213kB / 4.1kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"4.26kB / 1.76kB","PIDs":"2"}
+{"BlockIO":"0B / 0B","CPUPerc":"55.52%","Container":"045ce1160eb0","ID":"045ce1160eb0","MemPerc":"0.53%","MemUsage":"84.67MiB / 15.47GiB","Name":"load-tests-tusd-1","NetIO":"349MB / 258MB","PIDs":"27"}
+{"BlockIO":"0B / 0B","CPUPerc":"17.23%","Container":"e4e5ae23b118","ID":"e4e5ae23b118","MemPerc":"3.59%","MemUsage":"569.1MiB / 15.47GiB","Name":"load-tests-uploader-1","NetIO":"334kB / 349MB","PIDs":"48"}
+{"BlockIO":"373kB / 189MB","CPUPerc":"637.26%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.59%","MemUsage":"568.3MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"254MB / 303kB","PIDs":"28"}
+{"BlockIO":"213kB / 4.1kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"4.26kB / 1.76kB","PIDs":"2"}
+{"BlockIO":"729kB / 526MB","CPUPerc":"172.00%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.47%","MemUsage":"550.3MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"213kB / 16.4kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"4.46kB / 1.76kB","PIDs":"2"}
+{"BlockIO":"729kB / 526MB","CPUPerc":"172.00%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.47%","MemUsage":"550.3MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"213kB / 16.4kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"4.46kB / 1.76kB","PIDs":"2"}
+{"BlockIO":"733kB / 526MB","CPUPerc":"0.27%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.47%","MemUsage":"550.3MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"213kB / 16.4kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"4.85kB / 1.76kB","PIDs":"2"}
+{"BlockIO":"733kB / 526MB","CPUPerc":"0.27%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.47%","MemUsage":"550.3MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"213kB / 16.4kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"4.85kB / 1.76kB","PIDs":"2"}
+{"BlockIO":"733kB / 526MB","CPUPerc":"0.55%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.23%","MemUsage":"511.1MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"213kB / 16.4kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"4.96kB / 1.8kB","PIDs":"2"}
+{"BlockIO":"733kB / 526MB","CPUPerc":"0.55%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.23%","MemUsage":"511.1MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"213kB / 16.4kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"4.96kB / 1.8kB","PIDs":"2"}
+{"BlockIO":"733kB / 526MB","CPUPerc":"0.00%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.23%","MemUsage":"511.1MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"213kB / 16.4kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"4.96kB / 1.8kB","PIDs":"2"}
+{"BlockIO":"733kB / 526MB","CPUPerc":"0.00%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.23%","MemUsage":"511.1MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"213kB / 16.4kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"4.96kB / 1.8kB","PIDs":"2"}
+{"BlockIO":"733kB / 526MB","CPUPerc":"0.02%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.23%","MemUsage":"511.1MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"213kB / 16.4kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"4.96kB / 1.8kB","PIDs":"2"}
+{"BlockIO":"733kB / 526MB","CPUPerc":"0.02%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.23%","MemUsage":"511.1MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"213kB / 16.4kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"4.96kB / 1.8kB","PIDs":"2"}
+{"BlockIO":"733kB / 526MB","CPUPerc":"0.00%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.23%","MemUsage":"511.1MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"213kB / 16.4kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"5.14kB / 1.8kB","PIDs":"2"}
+{"BlockIO":"733kB / 526MB","CPUPerc":"0.00%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.23%","MemUsage":"511.1MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"213kB / 16.4kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"5.14kB / 1.8kB","PIDs":"2"}
+{"BlockIO":"733kB / 526MB","CPUPerc":"0.10%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.23%","MemUsage":"511.1MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"213kB / 16.4kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"5.14kB / 1.8kB","PIDs":"2"}
+{"BlockIO":"733kB / 526MB","CPUPerc":"0.10%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.23%","MemUsage":"511.1MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"213kB / 16.4kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"5.14kB / 1.8kB","PIDs":"2"}
+{"BlockIO":"733kB / 526MB","CPUPerc":"0.00%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.23%","MemUsage":"511.1MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"213kB / 16.4kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"5.14kB / 1.8kB","PIDs":"2"}
+{"BlockIO":"733kB / 526MB","CPUPerc":"0.00%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.23%","MemUsage":"511.1MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"213kB / 16.4kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"5.14kB / 1.8kB","PIDs":"2"}
+{"BlockIO":"733kB / 526MB","CPUPerc":"0.02%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.23%","MemUsage":"511.1MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"213kB / 16.4kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"5.14kB / 1.8kB","PIDs":"2"}
+{"BlockIO":"733kB / 526MB","CPUPerc":"0.02%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.23%","MemUsage":"511.1MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"213kB / 16.4kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"5.14kB / 1.8kB","PIDs":"2"}
+{"BlockIO":"733kB / 526MB","CPUPerc":"0.00%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.23%","MemUsage":"511.1MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"213kB / 16.4kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"5.14kB / 1.8kB","PIDs":"2"}
+{"BlockIO":"733kB / 526MB","CPUPerc":"0.00%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.23%","MemUsage":"511.1MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"213kB / 16.4kB","CPUPerc":"0.00%","Container":"6f791422d2d9","ID":"6f791422d2d9","MemPerc":"0.01%","MemUsage":"1.168MiB / 15.47GiB","Name":"load-tests-createbucket-1","NetIO":"5.14kB / 1.8kB","PIDs":"2"}
+{"BlockIO":"733kB / 526MB","CPUPerc":"0.03%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.23%","MemUsage":"511.1MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}
+{"BlockIO":"733kB / 526MB","CPUPerc":"0.03%","Container":"ae420f5bad2a","ID":"ae420f5bad2a","MemPerc":"3.23%","MemUsage":"511.1MiB / 15.47GiB","Name":"load-tests-s3-1","NetIO":"528MB / 485kB","PIDs":"51"}

docker/load-tests/uploader/Dockerfile

@@ -0,0 +1,9 @@
+FROM alpine:3.16.2
+
+RUN apk add --no-cache curl bash openssl
+
+COPY ./upload.sh /usr/local/share/upload.sh
+RUN chmod +x /usr/local/share/upload.sh
+
+ENTRYPOINT [ "/usr/local/share/upload.sh" ]
+CMD []

docker/load-tests/uploader/upload.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+
+set -e
+set -o pipefail
+
+echo $@
+
+if [ -z "$2" ]; then
+    echo "USAGE: upload.sh SIZE NUMBER [TEMP DIR]"
+    exit 1
+fi
+
+size="$1"
+number="$2"
+directory="${3:-/tmp}"
+file="${directory}/${size}.bin"
+
+openssl rand -out "$file" "$size"
+
+# Get upload size in bytes
+upload_size=$(stat -c "%s" "$file")
+echo "Generated file with size: ${upload_size} bytes."
+
+# Create uploads
+for i in $(seq 1 $number); do
+    # Note: I wanted to use the new feature for extracting header values
+    # (https://daniel.haxx.se/blog/2022/03/24/easier-header-picking-with-curl/)
+    # but this is not yet available on the current curl version in Alpine Linux.
+    upload_urls[${i}]="$(curl -X POST -H 'Tus-Resumable: 1.0.0' -H "Upload-Length: ${upload_size}" --fail --silent -i http://tusd:1080/files/ | grep -i ^Location: | cut -d: -f2- | sed 's/^ *\(.*\).*/\1/' | tr -d '\r')"
+done
+
+# Perform the uploads in parallel
+for i in $(seq 1 $number); do
+    curl -X PATCH -H 'Tus-Resumable: 1.0.0' -H 'Upload-Offset: 0' -H 'Content-Type: application/offset+octet-stream' --data-binary "@${file}" "${upload_urls[${i}]}" &
+    pids[${i}]=$!
+done
+
+# Wait for all uploads to complete
+for pid in ${pids[*]}; do
+    wait $pid
+done

docs/hooks.md

@@ -1,5 +1,7 @@
 # Hooks
 
+TODO: Update with new details
+
 When integrating tusd into an application, it is important to establish a communication channel between the two components. The tusd binary accomplishes this by providing a system which triggers actions when certain events happen, such as an upload being created or finished. This simple-but-powerful system enables uses ranging from logging over validation and authorization to processing the uploaded files.
 
 When a specific action happens during an upload (pre-create, post-receive, post-finish, or post-terminate), the hook system enables tusd to fire off a specific event. Tusd provides two ways of doing this:
@@ -211,9 +213,9 @@ $ # Retrying 5 times with a 2 second backoff
 $ tusd --hooks-http http://localhost:8081/write --hooks-http-retry 5 --hooks-http-backoff 2
 ```
 
-## GRPC Hooks
+## gRPC Hooks
 
-GRPC Hooks are the third type of hooks supported by tusd. Like the others hooks, it is disabled by default. To enable it, pass the `--hooks-grpc` option to the tusd binary. The flag's value will be a gRPC endpoint, which the tusd binary will be sent to:
+gRPC Hooks are the third type of hooks supported by tusd. Like the others hooks, it is disabled by default. To enable it, pass the `--hooks-grpc` option to the tusd binary. The flag's value will be a gRPC endpoint, which the tusd binary will be sent to:
 
 ```bash
 $ tusd --hooks-grpc localhost:8080

docs/minio.txt

@@ -0,0 +1,3 @@
+MINIO_ROOT_USER=AKIAIOSFODNN7EXAMPLE MINIO_ROOT_PASSWORD=wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY ./minio server data
+
+AWS_ACCESS_KEY_ID=AKIAIOSFODNN7EXAMPLE AWS_SECRET_ACCESS_KEY=wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY go run cmd/tusd/main.go -s3-bucket tusdtest.transloadit.com -s3-endpoint http://127.0.0.1:9000 -expose-pprof

examples/README.md

@@ -0,0 +1,11 @@
+# Examples
+
+This directory contains following examples:
+
+- `apache2.conf` is the recommended minimum configuration for an Apache2 proxy in front of tusd.
+- `nginx.conf` is the recommended minimum configuration for an Nginx proxy in front of tusd.
+- `server/` is an example of how to the tusd package embedded in your own Go application.
+- `hooks/file/` are Bash scripts for file hook implementations.
+- `hooks/http/` is a Python HTTP server as the HTTP hook implementation.
+- `hooks/grpc/` is a Python gRPC server as the gRPC hook implementation.
+- `hooks/plugin/` is a Go plugin usable with the plugin hooks.

examples/hooks/file/post-create

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+# This example demonstrates how to read the hook event details
+# from stdout and output debug messages.
+
+id="$TUS_ID"
+size="$TUS_SIZE"
+
+# We use >&2 to write debugging output to stderr. tusd
+# will forward these to its stderr. Any output from the
+# hook on stdout will be captured by tusd and interpreted
+# as a response.
+echo "Upload created with ID ${id} and size ${size}" >&2
+cat /dev/stdin | jq . >&2

examples/hooks/file/post-finish

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+# This example demonstrates how to read the hook event details
+# from environment variables, stdin, and output debug messages.
+
+# We use >&2 to write debugging output to stderr. tusd
+# will forward these to its stderr. Any output from the
+# hook on stdout will be captured by tusd and interpreted
+# as a response.
+echo "Upload $TUS_ID ($TUS_SIZE bytes) finished" >&2
+cat /dev/stdin | jq . >&2

examples/hooks/file/post-receive

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+# This example demonstrates how to read the hook event details
+# from environment variables and output debug messages.
+
+id="$TUS_ID"
+offset="$TUS_OFFSET"
+size="$TUS_SIZE"
+progress=$((100 * $offset/$size))
+
+# We use >&2 to write debugging output to stderr. tusd
+# will forward these to its stderr. Any output from the
+# hook on stdout will be captured by tusd and interpreted
+# as a response.
+echo "Upload ${id} is at ${progress}% (${offset}/${size})" >&2

examples/hooks/file/post-terminate

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+# This example demonstrates how to read the hook event details
+# from environment variables, stdin, and output debug messages.
+
+# We use >&2 to write debugging output to stderr. tusd
+# will forward these to its stderr. Any output from the
+# hook on stdout will be captured by tusd and interpreted
+# as a response.
+echo "Upload $TUS_ID terminated" >&2
+cat /dev/stdin | jq . >&2

examples/hooks/file/pre-create

@@ -0,0 +1,37 @@
+#!/bin/sh
+
+# This example demonstrates how to read the hook event details
+# from stdout, output debug messages, and reject a new upload based
+# on custom constraints. Here, an upload will be rejected if the
+# filename metadata is missing. Remove the following `exit 0` line
+# to activate the constraint:
+exit 0
+
+hasFilename="$(cat /dev/stdin | jq '.Event.Upload.MetaData | has("filename")')"
+
+# We use >&2 to write debugging output to stderr. tusd
+# will forward these to its stderr. Any output from the
+# hook on stdout will be captured by tusd and interpreted
+# as a response.
+echo "Filename exists: $hasFilename" >&2
+
+if [ "$hasFilename" == "false" ]; then
+
+  # If the condition is not met, output a JSON object on stdout,
+  # that instructs tusd to reject the upload and respond with a custom
+  # HTTP error response.
+  cat <<END
+  {
+    "RejectUpload": true,
+    "HTTPResponse": {
+      "StatusCode": 400,
+      "Body": "no filename provided"
+    }
+  }
+END
+
+  # It is important that the hook exits with code 0. Otherwise, tusd
+  # assumes the hook has failed and will print an error message about
+  # the hook failure.
+  exit 0
+fi

examples/hooks/file/pre-finish

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+# This example demonstrates how to read the hook event details
+# from stdin, and output debug messages.
+
+# We use >&2 to write debugging output to stderr. tusd
+# will forward these to its stderr. Any output from the
+# hook on stdout will be captured by tusd and interpreted
+# as a response.
+cat /dev/stdin | jq . >&2

examples/hooks/grpc/Makefile

@@ -0,0 +1,2 @@
+hook_pb2.py:
+	python -m grpc_tools.protoc --proto_path=../../../cmd/tusd/cli/hooks/proto/v2/ hook.proto --python_out=. --grpc_python_out=.

examples/hooks/grpc/hook_pb2.py

@@ -0,0 +1,139 @@
+# -*- coding: utf-8 -*-
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: hook.proto
+"""Generated protocol buffer code."""
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import descriptor_pool as _descriptor_pool
+from google.protobuf import message as _message
+from google.protobuf import reflection as _reflection
+from google.protobuf import symbol_database as _symbol_database
+# @@protoc_insertion_point(imports)
+
+_sym_db = _symbol_database.Default()
+
+
+
+
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\nhook.proto\x12\x02v2\"5\n\x0bHookRequest\x12\x0c\n\x04type\x18\x01 \x01(\t\x12\x18\n\x05\x65vent\x18\x02 \x01(\x0b\x32\t.v2.Event\"K\n\x05\x45vent\x12\x1c\n\x06upload\x18\x01 \x01(\x0b\x32\x0c.v2.FileInfo\x12$\n\x0bhttpRequest\x18\x02 \x01(\x0b\x32\x0f.v2.HTTPRequest\"\xc3\x02\n\x08\x46ileInfo\x12\n\n\x02id\x18\x01 \x01(\t\x12\x0c\n\x04size\x18\x02 \x01(\x03\x12\x16\n\x0esizeIsDeferred\x18\x03 \x01(\x08\x12\x0e\n\x06offset\x18\x04 \x01(\x03\x12,\n\x08metaData\x18\x05 \x03(\x0b\x32\x1a.v2.FileInfo.MetaDataEntry\x12\x11\n\tisPartial\x18\x06 \x01(\x08\x12\x0f\n\x07isFinal\x18\x07 \x01(\x08\x12\x16\n\x0epartialUploads\x18\x08 \x03(\t\x12*\n\x07storage\x18\t \x03(\x0b\x32\x19.v2.FileInfo.StorageEntry\x1a/\n\rMetaDataEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t:\x02\x38\x01\x1a.\n\x0cStorageEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t:\x02\x38\x01\"\x9a\x01\n\x0bHTTPRequest\x12\x0e\n\x06method\x18\x01 \x01(\t\x12\x0b\n\x03uri\x18\x02 \x01(\t\x12\x12\n\nremoteAddr\x18\x03 \x01(\t\x12+\n\x06header\x18\x04 \x03(\x0b\x32\x1b.v2.HTTPRequest.HeaderEntry\x1a-\n\x0bHeaderEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t:\x02\x38\x01\"`\n\x0cHookResponse\x12&\n\x0chttpResponse\x18\x01 \x01(\x0b\x32\x10.v2.HTTPResponse\x12\x14\n\x0crejectUpload\x18\x02 \x01(\x08\x12\x12\n\nstopUpload\x18\x03 \x01(\x08\"\x90\x01\n\x0cHTTPResponse\x12\x12\n\nstatusCode\x18\x01 \x01(\x03\x12.\n\x07headers\x18\x02 \x03(\x0b\x32\x1d.v2.HTTPResponse.HeadersEntry\x12\x0c\n\x04\x62ody\x18\x03 \x01(\t\x1a.\n\x0cHeadersEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t:\x02\x38\x01\x32@\n\x0bHookHandler\x12\x31\n\nInvokeHook\x12\x0f.v2.HookRequest\x1a\x10.v2.HookResponse\"\x00\x62\x06proto3')
+
+
+
+_HOOKREQUEST = DESCRIPTOR.message_types_by_name['HookRequest']
+_EVENT = DESCRIPTOR.message_types_by_name['Event']
+_FILEINFO = DESCRIPTOR.message_types_by_name['FileInfo']
+_FILEINFO_METADATAENTRY = _FILEINFO.nested_types_by_name['MetaDataEntry']
+_FILEINFO_STORAGEENTRY = _FILEINFO.nested_types_by_name['StorageEntry']
+_HTTPREQUEST = DESCRIPTOR.message_types_by_name['HTTPRequest']
+_HTTPREQUEST_HEADERENTRY = _HTTPREQUEST.nested_types_by_name['HeaderEntry']
+_HOOKRESPONSE = DESCRIPTOR.message_types_by_name['HookResponse']
+_HTTPRESPONSE = DESCRIPTOR.message_types_by_name['HTTPResponse']
+_HTTPRESPONSE_HEADERSENTRY = _HTTPRESPONSE.nested_types_by_name['HeadersEntry']
+HookRequest = _reflection.GeneratedProtocolMessageType('HookRequest', (_message.Message,), {
+  'DESCRIPTOR' : _HOOKREQUEST,
+  '__module__' : 'hook_pb2'
+  # @@protoc_insertion_point(class_scope:v2.HookRequest)
+  })
+_sym_db.RegisterMessage(HookRequest)
+
+Event = _reflection.GeneratedProtocolMessageType('Event', (_message.Message,), {
+  'DESCRIPTOR' : _EVENT,
+  '__module__' : 'hook_pb2'
+  # @@protoc_insertion_point(class_scope:v2.Event)
+  })
+_sym_db.RegisterMessage(Event)
+
+FileInfo = _reflection.GeneratedProtocolMessageType('FileInfo', (_message.Message,), {
+
+  'MetaDataEntry' : _reflection.GeneratedProtocolMessageType('MetaDataEntry', (_message.Message,), {
+    'DESCRIPTOR' : _FILEINFO_METADATAENTRY,
+    '__module__' : 'hook_pb2'
+    # @@protoc_insertion_point(class_scope:v2.FileInfo.MetaDataEntry)
+    })
+  ,
+
+  'StorageEntry' : _reflection.GeneratedProtocolMessageType('StorageEntry', (_message.Message,), {
+    'DESCRIPTOR' : _FILEINFO_STORAGEENTRY,
+    '__module__' : 'hook_pb2'
+    # @@protoc_insertion_point(class_scope:v2.FileInfo.StorageEntry)
+    })
+  ,
+  'DESCRIPTOR' : _FILEINFO,
+  '__module__' : 'hook_pb2'
+  # @@protoc_insertion_point(class_scope:v2.FileInfo)
+  })
+_sym_db.RegisterMessage(FileInfo)
+_sym_db.RegisterMessage(FileInfo.MetaDataEntry)
+_sym_db.RegisterMessage(FileInfo.StorageEntry)
+
+HTTPRequest = _reflection.GeneratedProtocolMessageType('HTTPRequest', (_message.Message,), {
+
+  'HeaderEntry' : _reflection.GeneratedProtocolMessageType('HeaderEntry', (_message.Message,), {
+    'DESCRIPTOR' : _HTTPREQUEST_HEADERENTRY,
+    '__module__' : 'hook_pb2'
+    # @@protoc_insertion_point(class_scope:v2.HTTPRequest.HeaderEntry)
+    })
+  ,
+  'DESCRIPTOR' : _HTTPREQUEST,
+  '__module__' : 'hook_pb2'
+  # @@protoc_insertion_point(class_scope:v2.HTTPRequest)
+  })
+_sym_db.RegisterMessage(HTTPRequest)
+_sym_db.RegisterMessage(HTTPRequest.HeaderEntry)
+
+HookResponse = _reflection.GeneratedProtocolMessageType('HookResponse', (_message.Message,), {
+  'DESCRIPTOR' : _HOOKRESPONSE,
+  '__module__' : 'hook_pb2'
+  # @@protoc_insertion_point(class_scope:v2.HookResponse)
+  })
+_sym_db.RegisterMessage(HookResponse)
+
+HTTPResponse = _reflection.GeneratedProtocolMessageType('HTTPResponse', (_message.Message,), {
+
+  'HeadersEntry' : _reflection.GeneratedProtocolMessageType('HeadersEntry', (_message.Message,), {
+    'DESCRIPTOR' : _HTTPRESPONSE_HEADERSENTRY,
+    '__module__' : 'hook_pb2'
+    # @@protoc_insertion_point(class_scope:v2.HTTPResponse.HeadersEntry)
+    })
+  ,
+  'DESCRIPTOR' : _HTTPRESPONSE,
+  '__module__' : 'hook_pb2'
+  # @@protoc_insertion_point(class_scope:v2.HTTPResponse)
+  })
+_sym_db.RegisterMessage(HTTPResponse)
+_sym_db.RegisterMessage(HTTPResponse.HeadersEntry)
+
+_HOOKHANDLER = DESCRIPTOR.services_by_name['HookHandler']
+if _descriptor._USE_C_DESCRIPTORS == False:
+
+  DESCRIPTOR._options = None
+  _FILEINFO_METADATAENTRY._options = None
+  _FILEINFO_METADATAENTRY._serialized_options = b'8\001'
+  _FILEINFO_STORAGEENTRY._options = None
+  _FILEINFO_STORAGEENTRY._serialized_options = b'8\001'
+  _HTTPREQUEST_HEADERENTRY._options = None
+  _HTTPREQUEST_HEADERENTRY._serialized_options = b'8\001'
+  _HTTPRESPONSE_HEADERSENTRY._options = None
+  _HTTPRESPONSE_HEADERSENTRY._serialized_options = b'8\001'
+  _HOOKREQUEST._serialized_start=18
+  _HOOKREQUEST._serialized_end=71
+  _EVENT._serialized_start=73
+  _EVENT._serialized_end=148
+  _FILEINFO._serialized_start=151
+  _FILEINFO._serialized_end=474
+  _FILEINFO_METADATAENTRY._serialized_start=379
+  _FILEINFO_METADATAENTRY._serialized_end=426
+  _FILEINFO_STORAGEENTRY._serialized_start=428
+  _FILEINFO_STORAGEENTRY._serialized_end=474
+  _HTTPREQUEST._serialized_start=477
+  _HTTPREQUEST._serialized_end=631
+  _HTTPREQUEST_HEADERENTRY._serialized_start=586
+  _HTTPREQUEST_HEADERENTRY._serialized_end=631
+  _HOOKRESPONSE._serialized_start=633
+  _HOOKRESPONSE._serialized_end=729
+  _HTTPRESPONSE._serialized_start=732
+  _HTTPRESPONSE._serialized_end=876
+  _HTTPRESPONSE_HEADERSENTRY._serialized_start=830
+  _HTTPRESPONSE_HEADERSENTRY._serialized_end=876
+  _HOOKHANDLER._serialized_start=878
+  _HOOKHANDLER._serialized_end=942
+# @@protoc_insertion_point(module_scope)

examples/hooks/grpc/hook_pb2_grpc.py

@@ -0,0 +1,70 @@
+# Generated by the gRPC Python protocol compiler plugin. DO NOT EDIT!
+"""Client and server classes corresponding to protobuf-defined services."""
+import grpc
+
+import hook_pb2 as hook__pb2
+
+
+class HookHandlerStub(object):
+    """The hook service definition.
+    """
+
+    def __init__(self, channel):
+        """Constructor.
+
+        Args:
+            channel: A grpc.Channel.
+        """
+        self.InvokeHook = channel.unary_unary(
+                '/v2.HookHandler/InvokeHook',
+                request_serializer=hook__pb2.HookRequest.SerializeToString,
+                response_deserializer=hook__pb2.HookResponse.FromString,
+                )
+
+
+class HookHandlerServicer(object):
+    """The hook service definition.
+    """
+
+    def InvokeHook(self, request, context):
+        """Sends a hook
+        """
+        context.set_code(grpc.StatusCode.UNIMPLEMENTED)
+        context.set_details('Method not implemented!')
+        raise NotImplementedError('Method not implemented!')
+
+
+def add_HookHandlerServicer_to_server(servicer, server):
+    rpc_method_handlers = {
+            'InvokeHook': grpc.unary_unary_rpc_method_handler(
+                    servicer.InvokeHook,
+                    request_deserializer=hook__pb2.HookRequest.FromString,
+                    response_serializer=hook__pb2.HookResponse.SerializeToString,
+            ),
+    }
+    generic_handler = grpc.method_handlers_generic_handler(
+            'v2.HookHandler', rpc_method_handlers)
+    server.add_generic_rpc_handlers((generic_handler,))
+
+
+ # This class is part of an EXPERIMENTAL API.
+class HookHandler(object):
+    """The hook service definition.
+    """
+
+    @staticmethod
+    def InvokeHook(request,
+            target,
+            options=(),
+            channel_credentials=None,
+            call_credentials=None,
+            insecure=False,
+            compression=None,
+            wait_for_ready=None,
+            timeout=None,
+            metadata=None):
+        return grpc.experimental.unary_unary(request, target, '/v2.HookHandler/InvokeHook',
+            hook__pb2.HookRequest.SerializeToString,
+            hook__pb2.HookResponse.FromString,
+            options, channel_credentials,
+            insecure, call_credentials, compression, wait_for_ready, timeout, metadata)

examples/hooks/grpc/server.py

@@ -0,0 +1,57 @@
+import grpc
+from concurrent import futures
+import time
+import hook_pb2_grpc as pb2_grpc
+import hook_pb2 as pb2
+
+class HookHandler(pb2_grpc.HookHandlerServicer):
+
+    def __init__(self, *args, **kwargs):
+        pass
+
+    def InvokeHook(self, hook_request, context):
+        # Print data from hook request for debugging
+        print('Received hook request:')
+        print(hook_request)
+
+        # Prepare hook response structure
+        hook_response = pb2.HookResponse()
+
+        # Example: Use the pre-create hook to check if a filename has been supplied
+        # using metadata. If not, the upload is rejected with a custom HTTP response.
+        if hook_request.type == 'pre-create':
+            filename = hook_request.event.upload.metaData['filename']
+            if filename == "":
+                hook_response.rejectUpload = True
+                hook_response.httpResponse.statusCode = 400
+                hook_response.httpResponse.body = 'no filename provided'
+                hook_response.httpResponse.headers['X-Some-Header'] = 'yes'
+
+        # Example: Use the post-finish hook to print information about a completed upload,
+        # including its storage location.
+        if hook_request.type == 'post-finish':
+            id      = hook_request.event.upload.id
+            size    = hook_request.event.upload.size
+            storage = hook_request.event.upload.storage
+
+            print(f'Upload {id} ({size} bytes) is finished. Find the file at:')
+            print(storage)
+
+        # Print data of hook response for debugging
+        print('Responding with hook response:')
+        print(hook_response)
+        print('------')
+        print('')
+
+        # Return the hook response to send back to tusd
+        return hook_response
+
+def serve():
+    server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))
+    pb2_grpc.add_HookHandlerServicer_to_server(HookHandler(), server)
+    server.add_insecure_port('[::]:8000')
+    server.start()
+    server.wait_for_termination()
+
+if __name__ == '__main__':
+    serve()

examples/hooks/http/server.py

@@ -0,0 +1,65 @@
+from http.server import HTTPServer, BaseHTTPRequestHandler
+from io import BytesIO
+
+import json
+
+class HTTPHookHandler(BaseHTTPRequestHandler):
+
+    def do_GET(self):
+        self.send_response(200)
+        self.end_headers()
+        self.wfile.write(b'Hello! This server only responds to POST requests')
+
+    def do_POST(self):
+        # Read entire body as JSON object
+        content_length = int(self.headers['Content-Length'])
+        request_body = self.rfile.read(content_length)
+        hook_request = json.loads(request_body)
+
+        # Print data from hook request for debugging
+        print('Received hook request:')
+        print(hook_request)
+
+        # Prepare hook response structure
+        hook_response = {
+            'HTTPResponse': {
+                'Headers': {}
+            }
+        }
+
+        # Example: Use the pre-create hook to check if a filename has been supplied
+        # using metadata. If not, the upload is rejected with a custom HTTP response.
+        if hook_request['Type'] == 'pre-create':
+            metaData = hook_request['Event']['Upload']['MetaData']
+            if 'filename' not in metaData:
+                hook_response['RejectUpload'] = True
+                hook_response['HTTPResponse']['StatusCode'] = 400
+                hook_response['HTTPResponse']['Body'] = 'no filename provided'
+                hook_response['HTTPResponse']['Headers']['X-Some-Header'] = 'yes'
+
+        # Example: Use the post-finish hook to print information about a completed upload,
+        # including its storage location.
+        if hook_request['Type'] == 'post-finish':
+            id      = hook_request['Event']['Upload']['ID']
+            size    = hook_request['Event']['Upload']['Size']
+            storage = hook_request['Event']['Upload']['Storage']
+
+            print(f'Upload {id} ({size} bytes) is finished. Find the file at:')
+            print(storage)
+
+
+        # Print data of hook response for debugging
+        print('Responding with hook response:')
+        print(hook_response)
+        print('------')
+        print('')
+
+        # Send the data from the hook response as JSON output
+        response_body = json.dumps(hook_response)
+        self.send_response(200)
+        self.end_headers()
+        self.wfile.write(response_body.encode())
+
+
+httpd = HTTPServer(('localhost', 8000), HTTPHookHandler)
+httpd.serve_forever()

examples/hooks/plugin/Makefile

@@ -0,0 +1,2 @@
+hook_handler: hook_handler.go
+	go build -o hook_handler ./hook_handler.go

examples/hooks/plugin/hook_handler.go

@@ -0,0 +1,87 @@
+package main
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/hashicorp/go-hclog"
+	"github.com/hashicorp/go-plugin"
+	"github.com/tus/tusd/cmd/tusd/cli/hooks"
+)
+
+// Here is the implementation of our hook handler
+type MyHookHandler struct {
+	logger hclog.Logger
+}
+
+// Setup is called once the plugin has been loaded by tusd.
+func (g *MyHookHandler) Setup() error {
+	// Use the log package or the g.logger field to write debug messages.
+	// Do not write to stdout directly, as this is used for communication between
+	// tusd and the plugin.
+	log.Println("MyHookHandler.Setup is invoked")
+	return nil
+}
+
+// InvokeHook is called for every hook that tusd fires.
+func (g *MyHookHandler) InvokeHook(req hooks.HookRequest) (res hooks.HookResponse, err error) {
+	log.Println("MyHookHandler.InvokeHook is invoked")
+
+	// // Prepare hook response structure
+	// res.HTTPResponse.Headers = make(map[string]string)
+
+	// // Example: Use the pre-create hook to check if a filename has been supplied
+	// // using metadata. If not, the upload is rejected with a custom HTTP response.
+
+	// if req.Type == hooks.HookPreCreate {
+	// 	if _, ok := req.Event.Upload.MetaData["filename"]; !ok {
+	// 		res.RejectUpload = true
+	// 		res.HTTPResponse.StatusCode = 400
+	// 		res.HTTPResponse.Body = "no filename provided"
+	// 		res.HTTPResponse.Headers["X-Some-Header"] = "yes"
+	// 	}
+	// }
+
+	// // Example: Use the post-finish hook to print information about a completed upload,
+	// // including its storage location.
+	// if req.Type == hooks.HookPreFinish {
+	// 	id := req.Event.Upload.ID
+	// 	size := req.Event.Upload.Size
+	// 	storage := req.Event.Upload.Storage
+
+	// 	log.Printf("Upload %s (%d bytes) is finished. Find the file at:\n", id, size)
+	// 	log.Println(storage)
+
+	// }
+
+	// Return the hook response to tusd.
+	return res, nil
+}
+
+// handshakeConfigs are used to just do a basic handshake between
+// a plugin and tusd. If the handshake fails, a user friendly error is shown.
+// This prevents users from executing bad plugins or executing a plugin
+// directory. It is a UX feature, not a security feature.
+var handshakeConfig = plugin.HandshakeConfig{
+	ProtocolVersion:  1,
+	MagicCookieKey:   "TUSD_PLUGIN",
+	MagicCookieValue: "yes",
+}
+
+func main() {
+	// 1. Initialize our handler.
+	myHandler := &MyHookHandler{}
+
+	// 2. Construct the plugin map. The key must be "hookHandler".
+	var pluginMap = map[string]plugin.Plugin{
+		"hookHandler": &hooks.HookHandlerPlugin{Impl: myHandler},
+	}
+
+	// 3. Expose the plugin to tusd.
+	plugin.Serve(&plugin.ServeConfig{
+		HandshakeConfig: handshakeConfig,
+		Plugins:         pluginMap,
+	})
+
+	fmt.Println("DOONE")
+}

examples/hooks/post-create

@@ -1,8 +0,0 @@
-#!/bin/sh
-
-id="$TUS_ID"
-offset="$TUS_OFFSET"
-size="$TUS_SIZE"
-
-echo "Upload created with ID ${id} and size ${size}"
-cat /dev/stdin | jq .

examples/hooks/post-finish

@@ -1,4 +0,0 @@
-#!/bin/sh
-
-echo "Upload $TUS_ID ($TUS_SIZE bytes) finished"
-cat /dev/stdin | jq .

examples/hooks/post-receive

@@ -1,8 +0,0 @@
-#!/bin/sh
-
-id="$TUS_ID"
-offset="$TUS_OFFSET"
-size="$TUS_SIZE"
-progress=$((100 * $offset/$size))
-
-echo "Upload ${id} is at ${progress}% (${offset}/${size})"

examples/hooks/post-terminate

@@ -1,4 +0,0 @@
-#!/bin/sh
-
-echo "Upload $TUS_ID terminated"
-cat /dev/stdin | jq .

examples/hooks/pre-create

@@ -1,7 +0,0 @@
-#!/bin/sh
-
-filename=$(cat /dev/stdin | jq .Upload.MetaData.filename)
-if [ -z "$filename" ]; then
-  echo "Error: no filename provided"
-  exit 1
-fi

go.mod

@@ -2,7 +2,7 @@ module github.com/tus/tusd
 
 // Specify the Go version needed for the Heroku deployment
 // See https://github.com/heroku/heroku-buildpack-go#go-module-specifics
-// +heroku goVersion go1.16
+// +heroku goVersion go1.18
 go 1.16
 
 require (
@@ -10,9 +10,14 @@ require (
 	github.com/Azure/azure-storage-blob-go v0.14.0
 	github.com/aws/aws-sdk-go v1.44.114
 	github.com/bmizerany/pat v0.0.0-20170815010413-6226ea591a40
+	github.com/felixge/fgprof v0.9.2
+	github.com/goji/httpauth v0.0.0-20160601135302-2da839ab0f4d
 	github.com/golang/mock v1.6.0
 	github.com/golang/protobuf v1.5.2
 	github.com/grpc-ecosystem/go-grpc-middleware v1.3.0
+	github.com/hashicorp/go-hclog v0.14.1
+	github.com/hashicorp/go-plugin v1.4.3
+	github.com/minio/minio-go/v7 v7.0.31 // indirect
 	github.com/prometheus/client_golang v1.12.2
 	github.com/sethgrid/pester v0.0.0-20190127155807-68a33a018ad0
 	github.com/stretchr/testify v1.8.0

go.sum

@@ -170,6 +170,8 @@ github.com/cncf/xds/go v0.0.0-20211011173535-cb28da3451f1/go.mod h1:eXthEFrGJvWH
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dustin/go-humanize v1.0.0 h1:VSnTsYCnlFHaM2/igO1h6X3HA71jcobQuxemgkq4zYo=
+github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
@@ -180,6 +182,10 @@ github.com/envoyproxy/go-control-plane v0.9.9-0.20210512163311-63b5d3c536b0/go.m
 github.com/envoyproxy/go-control-plane v0.9.10-0.20210907150352-cf90f659a021/go.mod h1:AFq3mo9L8Lqqiid3OhADV3RfLJnjiw63cSpi+fDTRC0=
 github.com/envoyproxy/go-control-plane v0.10.2-0.20220325020618-49ff273808a1/go.mod h1:KJwIaB5Mv44NWtYuAOFCVOjcI94vtpEz2JU/D2v6IjE=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
+github.com/fatih/color v1.7.0 h1:DkWD4oS2D8LGGgTQ6IvwJJXSL5Vp2ffcQg58nFV38Ys=
+github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
+github.com/felixge/fgprof v0.9.2 h1:tAMHtWMyl6E0BimjVbFt7fieU6FpjttsZN7j0wT5blc=
+github.com/felixge/fgprof v0.9.2/go.mod h1:+VNi+ZXtHIQ6wIw6bUT8nXQRefQflWECoFyRealT5sg=
 github.com/form3tech-oss/jwt-go v3.2.2+incompatible h1:TcekIExNqud5crz4xD2pavyTgWiPvpYe4Xau31I0PRk=
 github.com/form3tech-oss/jwt-go v3.2.2+incompatible/go.mod h1:pbq4aXjuKjdthFRnoDwaVPLA+WlJuPGy+QneDUgJi2k=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
@@ -195,6 +201,8 @@ github.com/go-logfmt/logfmt v0.5.0/go.mod h1:wCYkCAKZfumFQihp8CzCvQ3paCTfi41vtzG
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
 github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
 github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
+github.com/goji/httpauth v0.0.0-20160601135302-2da839ab0f4d h1:lBXNCxVENCipq4D1Is42JVOP4eQjlB8TQ6H69Yx5J9Q=
+github.com/goji/httpauth v0.0.0-20160601135302-2da839ab0f4d/go.mod h1:nnjvkQ9ptGaCkuDUx6wNykzzlUixGxvkme+H/lnzb+A=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
 github.com/golang/groupcache v0.0.0-20191227052852-215e87163ea7/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
@@ -267,7 +275,10 @@ github.com/google/pprof v0.0.0-20210226084205-cbba55b83ad5/go.mod h1:kpwsk12EmLe
 github.com/google/pprof v0.0.0-20210601050228-01bbb1931b22/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
 github.com/google/pprof v0.0.0-20210609004039-a478d1d731e9/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
 github.com/google/pprof v0.0.0-20210720184732-4bb14d4b1be1/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
+github.com/google/pprof v0.0.0-20211214055906-6f57359322fd h1:1FjCyPC+syAzJ5/2S8fqdZK1R22vvA0J7JZKcuOIQ7Y=
+github.com/google/pprof v0.0.0-20211214055906-6f57359322fd/go.mod h1:KgnwoLYCZ8IQu3XUZ8Nc/bM9CCZFOyjUNOSygVozoDg=
 github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
+github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/google/uuid v1.2.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
@@ -285,15 +296,25 @@ github.com/googleapis/gax-go/v2 v2.4.0/go.mod h1:XOTVJ59hdnfJLIP/dh8n5CGryZR2LxK
 github.com/googleapis/gax-go/v2 v2.5.1 h1:kBRZU0PSuI7PspsSb/ChWoVResUcwNVIdpB049pKTiw=
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@@ -407,6 +458,8 @@ golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8U
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@@ -442,6 +495,7 @@ golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
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@@ -531,6 +585,7 @@ golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5h
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 golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -540,6 +595,8 @@ golang.org/x/sys v0.0.0-20190606165138-5da285871e9c/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190624142023-c5567b49c5d0/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190726091711-fc99dfbffb4e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191001151750-bb3f8db39f24/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191008105621-543471e840be/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191112214154-59a1497f0cea/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191228213918-04cbcbbfeed8/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -583,6 +640,7 @@ golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20210806184541-e5e7981a1069/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210823070655-63515b42dcdf/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210908233432-aa78b53d3365/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20211007075335-d3039528d8ac/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211124211545-fe61309f8881/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211210111614-af8b64212486/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
@@ -595,6 +653,7 @@ golang.org/x/sys v0.0.0-20220412211240-33da011f77ad/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20220502124256-b6088ccd6cba/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220503163025-988cb79eb6c6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
 golang.org/x/sys v0.0.0-20220610221304-9f5ed59c137d/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220615213510-4f61da869c0c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220624220833-87e55d714810/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
@@ -621,6 +680,7 @@ golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190312151545-0bb0c0a6e846/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190312170243-e65039ee4138/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
+golang.org/x/tools v0.0.0-20190328211700-ab21143f2384/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190425150028-36563e24a262/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
 golang.org/x/tools v0.0.0-20190506145303-2d16b83fe98c/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
 golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
@@ -732,6 +792,7 @@ google.golang.org/appengine v1.6.5/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCID
 google.golang.org/appengine v1.6.6/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
 google.golang.org/appengine v1.6.7 h1:FZR1q0exgwxzPzp/aF+VccGrSfxfPpkBqjIIEq3ru6c=
 google.golang.org/appengine v1.6.7/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
+google.golang.org/genproto v0.0.0-20170818010345-ee236bd376b0/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
 google.golang.org/genproto v0.0.0-20190418145605-e7d98fc518a7/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
@@ -809,6 +870,9 @@ google.golang.org/genproto v0.0.0-20220429170224-98d788798c3e/go.mod h1:8w6bsBMX
 google.golang.org/genproto v0.0.0-20220502173005-c8bf987b8c21/go.mod h1:RAyBrSAP7Fh3Nc84ghnVLDPuV51xc9agzmm4Ph6i0Q4=
 google.golang.org/genproto v0.0.0-20220505152158-f39f71e6c8f3/go.mod h1:RAyBrSAP7Fh3Nc84ghnVLDPuV51xc9agzmm4Ph6i0Q4=
 google.golang.org/genproto v0.0.0-20220518221133-4f43b3371335/go.mod h1:RAyBrSAP7Fh3Nc84ghnVLDPuV51xc9agzmm4Ph6i0Q4=
+google.golang.org/genproto v0.0.0-20220602131408-e326c6e8e9c8 h1:qRu95HZ148xXw+XeZ3dvqe85PxH4X8+jIo0iRPKcEnM=
+google.golang.org/genproto v0.0.0-20220602131408-e326c6e8e9c8/go.mod h1:yKyY4AMRwFiC8yMMNaMi+RkCnjZJt9LoWuvhXjMs+To=
+google.golang.org/grpc v1.8.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
 google.golang.org/genproto v0.0.0-20220523171625-347a074981d8/go.mod h1:RAyBrSAP7Fh3Nc84ghnVLDPuV51xc9agzmm4Ph6i0Q4=
 google.golang.org/genproto v0.0.0-20220608133413-ed9918b62aac/go.mod h1:KEWEmljWE5zPzLBa/oHl6DaEt9LmfH6WtH1OHIvleBA=
 google.golang.org/genproto v0.0.0-20220616135557-88e70c0c3a90/go.mod h1:KEWEmljWE5zPzLBa/oHl6DaEt9LmfH6WtH1OHIvleBA=
@@ -892,6 +956,8 @@ gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EV
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/h2non/gock.v1 v1.1.2 h1:jBbHXgGBK/AoPVfJh5x4r/WxIrElvbLel8TCZkkZJoY=
 gopkg.in/h2non/gock.v1 v1.1.2/go.mod h1:n7UGz/ckNChHiK05rDoiC4MYSunEC/lyaUm2WWaDva0=
+gopkg.in/ini.v1 v1.57.0 h1:9unxIsFcTt4I55uWluz+UmL95q4kdJ0buvQ1ZIqVQww=
+gopkg.in/ini.v1 v1.57.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

internal/semaphore/semaphore.go

@@ -0,0 +1,20 @@
+// Package semaphore implements a basic semaphore for coordinating and limiting
+// non-exclusive, concurrent access.
+package semaphore
+
+type Semaphore chan struct{}
+
+// New creates a semaphore with the given concurrency limit.
+func New(concurrency int) Semaphore {
+	return make(chan struct{}, concurrency)
+}
+
+// Acquire will block until the semaphore can be acquired.
+func (s Semaphore) Acquire() {
+	s <- struct{}{}
+}
+
+// Release frees the acquired slot in the semaphore.
+func (s Semaphore) Release() {
+	<-s
+}

pkg/azurestore/azureservice.go

@@ -15,7 +15,6 @@
 package azurestore
 
 import (
-	"bytes"
 	"context"
 	"encoding/base64"
 	"encoding/binary"
@@ -59,8 +58,8 @@ type AzBlob interface {
 	Delete(ctx context.Context) error
 	// Upload the blob
 	Upload(ctx context.Context, body io.ReadSeeker) error
-	// Download the contents of the blob
-	Download(ctx context.Context) ([]byte, error)
+	// Download returns a readcloser to download the contents of the blob
+	Download(ctx context.Context) (io.ReadCloser, error)
 	// Get the offset of the blob and its indexes
 	GetOffset(ctx context.Context) (int64, error)
 	// Commit the uploaded blocks to the BlockBlob
@@ -171,7 +170,7 @@ func (blockBlob *BlockBlob) Upload(ctx context.Context, body io.ReadSeeker) erro
 }
 
 // Download the blockBlob from Azure Blob Storage
-func (blockBlob *BlockBlob) Download(ctx context.Context) (data []byte, err error) {
+func (blockBlob *BlockBlob) Download(ctx context.Context) (io.ReadCloser, error) {
 	downloadResponse, err := blockBlob.Blob.Download(ctx, 0, azblob.CountToEnd, azblob.BlobAccessConditions{}, false, azblob.ClientProvidedKeyOptions{})
 
 	// If the file does not exist, it will not return an error, but a 404 status and body
@@ -186,15 +185,7 @@ func (blockBlob *BlockBlob) Download(ctx context.Context) (data []byte, err erro
 		return nil, err
 	}
 
-	bodyStream := downloadResponse.Body(azblob.RetryReaderOptions{MaxRetryRequests: 20})
-	downloadedData := bytes.Buffer{}
-
-	_, err = downloadedData.ReadFrom(bodyStream)
-	if err != nil {
-		return nil, err
-	}
-
-	return downloadedData.Bytes(), nil
+	return downloadResponse.Body(azblob.RetryReaderOptions{MaxRetryRequests: 20}), nil
 }
 
 func (blockBlob *BlockBlob) GetOffset(ctx context.Context) (int64, error) {
@@ -258,7 +249,7 @@ func (infoBlob *InfoBlob) Upload(ctx context.Context, body io.ReadSeeker) error
 }
 
 // Download the infoBlob from Azure Blob Storage
-func (infoBlob *InfoBlob) Download(ctx context.Context) ([]byte, error) {
+func (infoBlob *InfoBlob) Download(ctx context.Context) (io.ReadCloser, error) {
 	downloadResponse, err := infoBlob.Blob.Download(ctx, 0, azblob.CountToEnd, azblob.BlobAccessConditions{}, false, azblob.ClientProvidedKeyOptions{})
 
 	// If the file does not exist, it will not return an error, but a 404 status and body
@@ -272,15 +263,7 @@ func (infoBlob *InfoBlob) Download(ctx context.Context) ([]byte, error) {
 		return nil, err
 	}
 
-	bodyStream := downloadResponse.Body(azblob.RetryReaderOptions{MaxRetryRequests: 20})
-	downloadedData := bytes.Buffer{}
-
-	_, err = downloadedData.ReadFrom(bodyStream)
-	if err != nil {
-		return nil, err
-	}
-
-	return downloadedData.Bytes(), nil
+	return downloadResponse.Body(azblob.RetryReaderOptions{MaxRetryRequests: 20}), nil
 }
 
 // infoBlob does not utilise offset, so just return 0, nil

pkg/azurestore/azurestore.go

@@ -96,8 +96,9 @@ func (store AzureStore) GetUpload(ctx context.Context, id string) (handler.Uploa
 	if err != nil {
 		return nil, err
 	}
+	defer data.Close()
 
-	if err := json.Unmarshal(data, &info); err != nil {
+	if err := json.NewDecoder(data).Decode(&info); err != nil {
 		return nil, err
 	}
 
@@ -112,8 +113,12 @@ func (store AzureStore) GetUpload(ctx context.Context, id string) (handler.Uploa
 	}
 
 	offset, err := blockBlob.GetOffset(ctx)
-	if err != nil && err != handler.ErrNotFound {
-		return nil, err
+	if err != nil {
+		// Unpack the error and see if it is a handler.ErrNotFound by comparing the
+		// error code. If it matches, we ignore the error, otherwise we return the error.
+		if handlerErr, ok := err.(handler.Error); !ok || handlerErr.ErrorCode != handler.ErrNotFound.ErrorCode {
+			return nil, err
+		}
 	}
 
 	info.Offset = offset
@@ -169,7 +174,7 @@ func (upload *AzUpload) GetInfo(ctx context.Context) (handler.FileInfo, error) {
 		return info, err
 	}
 
-	if err := json.Unmarshal(data, &info); err != nil {
+	if err := json.NewDecoder(data).Decode(&info); err != nil {
 		return info, err
 	}
 
@@ -178,12 +183,8 @@ func (upload *AzUpload) GetInfo(ctx context.Context) (handler.FileInfo, error) {
 }
 
 // Get the uploaded file from the Azure storage
-func (upload *AzUpload) GetReader(ctx context.Context) (io.Reader, error) {
-	b, err := upload.BlockBlob.Download(ctx)
-	if err != nil {
-		return nil, err
-	}
-	return bytes.NewReader(b), nil
+func (upload *AzUpload) GetReader(ctx context.Context) (io.ReadCloser, error) {
+	return upload.BlockBlob.Download(ctx)
 }
 
 // Finish the file upload and commit the block list

pkg/azurestore/azurestore_mock_test.go

@@ -6,36 +6,37 @@ package azurestore_test
 
 import (
 	context "context"
-	gomock "github.com/golang/mock/gomock"
-	azurestore "github.com/tus/tusd/pkg/azurestore"
 	io "io"
 	reflect "reflect"
+
+	gomock "github.com/golang/mock/gomock"
+	azurestore "github.com/tus/tusd/pkg/azurestore"
 )
 
-// MockAzService is a mock of AzService interface
+// MockAzService is a mock of AzService interface.
 type MockAzService struct {
 	ctrl     *gomock.Controller
 	recorder *MockAzServiceMockRecorder
 }
 
-// MockAzServiceMockRecorder is the mock recorder for MockAzService
+// MockAzServiceMockRecorder is the mock recorder for MockAzService.
 type MockAzServiceMockRecorder struct {
 	mock *MockAzService
 }
 
-// NewMockAzService creates a new mock instance
+// NewMockAzService creates a new mock instance.
 func NewMockAzService(ctrl *gomock.Controller) *MockAzService {
 	mock := &MockAzService{ctrl: ctrl}
 	mock.recorder = &MockAzServiceMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockAzService) EXPECT() *MockAzServiceMockRecorder {
 	return m.recorder
 }
 
-// NewBlob mocks base method
+// NewBlob mocks base method.
 func (m *MockAzService) NewBlob(arg0 context.Context, arg1 string) (azurestore.AzBlob, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "NewBlob", arg0, arg1)
@@ -44,36 +45,36 @@ func (m *MockAzService) NewBlob(arg0 context.Context, arg1 string) (azurestore.A
 	return ret0, ret1
 }
 
-// NewBlob indicates an expected call of NewBlob
+// NewBlob indicates an expected call of NewBlob.
 func (mr *MockAzServiceMockRecorder) NewBlob(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "NewBlob", reflect.TypeOf((*MockAzService)(nil).NewBlob), arg0, arg1)
 }
 
-// MockAzBlob is a mock of AzBlob interface
+// MockAzBlob is a mock of AzBlob interface.
 type MockAzBlob struct {
 	ctrl     *gomock.Controller
 	recorder *MockAzBlobMockRecorder
 }
 
-// MockAzBlobMockRecorder is the mock recorder for MockAzBlob
+// MockAzBlobMockRecorder is the mock recorder for MockAzBlob.
 type MockAzBlobMockRecorder struct {
 	mock *MockAzBlob
 }
 
-// NewMockAzBlob creates a new mock instance
+// NewMockAzBlob creates a new mock instance.
 func NewMockAzBlob(ctrl *gomock.Controller) *MockAzBlob {
 	mock := &MockAzBlob{ctrl: ctrl}
 	mock.recorder = &MockAzBlobMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockAzBlob) EXPECT() *MockAzBlobMockRecorder {
 	return m.recorder
 }
 
-// Commit mocks base method
+// Commit mocks base method.
 func (m *MockAzBlob) Commit(arg0 context.Context) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Commit", arg0)
@@ -81,13 +82,13 @@ func (m *MockAzBlob) Commit(arg0 context.Context) error {
 	return ret0
 }
 
-// Commit indicates an expected call of Commit
+// Commit indicates an expected call of Commit.
 func (mr *MockAzBlobMockRecorder) Commit(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Commit", reflect.TypeOf((*MockAzBlob)(nil).Commit), arg0)
 }
 
-// Delete mocks base method
+// Delete mocks base method.
 func (m *MockAzBlob) Delete(arg0 context.Context) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Delete", arg0)
@@ -95,28 +96,28 @@ func (m *MockAzBlob) Delete(arg0 context.Context) error {
 	return ret0
 }
 
-// Delete indicates an expected call of Delete
+// Delete indicates an expected call of Delete.
 func (mr *MockAzBlobMockRecorder) Delete(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Delete", reflect.TypeOf((*MockAzBlob)(nil).Delete), arg0)
 }
 
-// Download mocks base method
-func (m *MockAzBlob) Download(arg0 context.Context) ([]byte, error) {
+// Download mocks base method.
+func (m *MockAzBlob) Download(arg0 context.Context) (io.ReadCloser, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Download", arg0)
-	ret0, _ := ret[0].([]byte)
+	ret0, _ := ret[0].(io.ReadCloser)
 	ret1, _ := ret[1].(error)
 	return ret0, ret1
 }
 
-// Download indicates an expected call of Download
+// Download indicates an expected call of Download.
 func (mr *MockAzBlobMockRecorder) Download(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Download", reflect.TypeOf((*MockAzBlob)(nil).Download), arg0)
 }
 
-// GetOffset mocks base method
+// GetOffset mocks base method.
 func (m *MockAzBlob) GetOffset(arg0 context.Context) (int64, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "GetOffset", arg0)
@@ -125,13 +126,13 @@ func (m *MockAzBlob) GetOffset(arg0 context.Context) (int64, error) {
 	return ret0, ret1
 }
 
-// GetOffset indicates an expected call of GetOffset
+// GetOffset indicates an expected call of GetOffset.
 func (mr *MockAzBlobMockRecorder) GetOffset(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetOffset", reflect.TypeOf((*MockAzBlob)(nil).GetOffset), arg0)
 }
 
-// Upload mocks base method
+// Upload mocks base method.
 func (m *MockAzBlob) Upload(arg0 context.Context, arg1 io.ReadSeeker) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Upload", arg0, arg1)
@@ -139,7 +140,7 @@ func (m *MockAzBlob) Upload(arg0 context.Context, arg1 io.ReadSeeker) error {
 	return ret0
 }
 
-// Upload indicates an expected call of Upload
+// Upload indicates an expected call of Upload.
 func (mr *MockAzBlobMockRecorder) Upload(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Upload", reflect.TypeOf((*MockAzBlob)(nil).Upload), arg0, arg1)

pkg/azurestore/azurestore_test.go

@@ -5,6 +5,7 @@ import (
 	"context"
 	"encoding/json"
 	"errors"
+	"io"
 	"testing"
 
 	"github.com/Azure/azure-storage-blob-go/azblob"
@@ -153,7 +154,7 @@ func TestGetUpload(t *testing.T) {
 
 	gomock.InOrder(
 		service.EXPECT().NewBlob(ctx, mockID+".info").Return(infoBlob, nil).Times(1),
-		infoBlob.EXPECT().Download(ctx).Return(data, nil).Times(1),
+		infoBlob.EXPECT().Download(ctx).Return(newReadCloser(data), nil).Times(1),
 		service.EXPECT().NewBlob(ctx, mockID).Return(blockBlob, nil).Times(1),
 		blockBlob.EXPECT().GetOffset(ctx).Return(int64(0), nil).Times(1),
 	)
@@ -189,7 +190,7 @@ func TestGetUploadTooLargeBlob(t *testing.T) {
 
 	gomock.InOrder(
 		service.EXPECT().NewBlob(ctx, mockID+".info").Return(infoBlob, nil).Times(1),
-		infoBlob.EXPECT().Download(ctx).Return(data, nil).Times(1),
+		infoBlob.EXPECT().Download(ctx).Return(newReadCloser(data), nil).Times(1),
 	)
 
 	upload, err := store.GetUpload(ctx, mockID)
@@ -246,10 +247,10 @@ func TestGetReader(t *testing.T) {
 
 	gomock.InOrder(
 		service.EXPECT().NewBlob(ctx, mockID+".info").Return(infoBlob, nil).Times(1),
-		infoBlob.EXPECT().Download(ctx).Return(data, nil).Times(1),
+		infoBlob.EXPECT().Download(ctx).Return(newReadCloser(data), nil).Times(1),
 		service.EXPECT().NewBlob(ctx, mockID).Return(blockBlob, nil).Times(1),
 		blockBlob.EXPECT().GetOffset(ctx).Return(int64(0), nil).Times(1),
-		blockBlob.EXPECT().Download(ctx).Return([]byte(mockReaderData), nil).Times(1),
+		blockBlob.EXPECT().Download(ctx).Return(newReadCloser([]byte(mockReaderData)), nil).Times(1),
 	)
 
 	upload, err := store.GetUpload(ctx, mockID)
@@ -286,7 +287,7 @@ func TestWriteChunk(t *testing.T) {
 
 	gomock.InOrder(
 		service.EXPECT().NewBlob(ctx, mockID+".info").Return(infoBlob, nil).Times(1),
-		infoBlob.EXPECT().Download(ctx).Return(data, nil).Times(1),
+		infoBlob.EXPECT().Download(ctx).Return(newReadCloser(data), nil).Times(1),
 		service.EXPECT().NewBlob(ctx, mockID).Return(blockBlob, nil).Times(1),
 		blockBlob.EXPECT().GetOffset(ctx).Return(offset, nil).Times(1),
 		blockBlob.EXPECT().Upload(ctx, bytes.NewReader([]byte(mockReaderData))).Return(nil).Times(1),
@@ -325,7 +326,7 @@ func TestFinishUpload(t *testing.T) {
 
 	gomock.InOrder(
 		service.EXPECT().NewBlob(ctx, mockID+".info").Return(infoBlob, nil).Times(1),
-		infoBlob.EXPECT().Download(ctx).Return(data, nil).Times(1),
+		infoBlob.EXPECT().Download(ctx).Return(newReadCloser(data), nil).Times(1),
 		service.EXPECT().NewBlob(ctx, mockID).Return(blockBlob, nil).Times(1),
 		blockBlob.EXPECT().GetOffset(ctx).Return(offset, nil).Times(1),
 		blockBlob.EXPECT().Commit(ctx).Return(nil).Times(1),
@@ -362,7 +363,7 @@ func TestTerminate(t *testing.T) {
 
 	gomock.InOrder(
 		service.EXPECT().NewBlob(ctx, mockID+".info").Return(infoBlob, nil).Times(1),
-		infoBlob.EXPECT().Download(ctx).Return(data, nil).Times(1),
+		infoBlob.EXPECT().Download(ctx).Return(newReadCloser(data), nil).Times(1),
 		service.EXPECT().NewBlob(ctx, mockID).Return(blockBlob, nil).Times(1),
 		blockBlob.EXPECT().GetOffset(ctx).Return(int64(0), nil).Times(1),
 		infoBlob.EXPECT().Delete(ctx).Return(nil).Times(1),
@@ -405,7 +406,7 @@ func TestDeclareLength(t *testing.T) {
 
 	gomock.InOrder(
 		service.EXPECT().NewBlob(ctx, mockID+".info").Return(infoBlob, nil).Times(1),
-		infoBlob.EXPECT().Download(ctx).Return(data, nil).Times(1),
+		infoBlob.EXPECT().Download(ctx).Return(newReadCloser(data), nil).Times(1),
 		service.EXPECT().NewBlob(ctx, mockID).Return(blockBlob, nil).Times(1),
 		blockBlob.EXPECT().GetOffset(ctx).Return(int64(0), nil).Times(1),
 		infoBlob.EXPECT().Upload(ctx, r).Return(nil).Times(1),
@@ -424,3 +425,7 @@ func TestDeclareLength(t *testing.T) {
 
 	cancel()
 }
+
+func newReadCloser(b []byte) io.ReadCloser {
+	return io.NopCloser(bytes.NewReader(b))
+}

pkg/filelocker/filelocker.go

@@ -9,6 +9,7 @@
 package filelocker
 
 import (
+	"context"
 	"os"
 	"path/filepath"
 
@@ -58,7 +59,8 @@ type fileUploadLock struct {
 	file lockfile.Lockfile
 }
 
-func (lock fileUploadLock) Lock() error {
+// TODO: Implement functionality for ctx and requestRelease.
+func (lock fileUploadLock) Lock(ctx context.Context, requestRelease func()) error {
 	err := lock.file.TryLock()
 	if err == lockfile.ErrBusy {
 		return handler.ErrFileLocked

pkg/filelocker/filelocker_test.go

@@ -1,6 +1,7 @@
 package filelocker
 
 import (
+	"context"
 	"io/ioutil"
 	"testing"
 
@@ -21,12 +22,12 @@ func TestFileLocker(t *testing.T) {
 	lock1, err := locker.NewLock("one")
 	a.NoError(err)
 
-	a.NoError(lock1.Lock())
-	a.Equal(handler.ErrFileLocked, lock1.Lock())
+	a.NoError(lock1.Lock(context.TODO(), nil))
+	a.Equal(handler.ErrFileLocked, lock1.Lock(context.TODO(), nil))
 
 	lock2, err := locker.NewLock("one")
 	a.NoError(err)
-	a.Equal(handler.ErrFileLocked, lock2.Lock())
+	a.Equal(handler.ErrFileLocked, lock2.Lock(context.TODO(), nil))
 
 	a.NoError(lock1.Unlock())
 }

pkg/filestore/filestore.go

@@ -168,7 +168,7 @@ func (upload *fileUpload) WriteChunk(ctx context.Context, offset int64, src io.R
 	return n, err
 }
 
-func (upload *fileUpload) GetReader(ctx context.Context) (io.Reader, error) {
+func (upload *fileUpload) GetReader(ctx context.Context) (io.ReadCloser, error) {
 	return os.Open(upload.binPath)
 }
 

pkg/gcsstore/gcsstore.go

@@ -325,7 +325,7 @@ func (upload gcsUpload) Terminate(ctx context.Context) error {
 	return nil
 }
 
-func (upload gcsUpload) GetReader(ctx context.Context) (io.Reader, error) {
+func (upload gcsUpload) GetReader(ctx context.Context) (io.ReadCloser, error) {
 	id := upload.id
 	store := upload.store
 
@@ -334,12 +334,7 @@ func (upload gcsUpload) GetReader(ctx context.Context) (io.Reader, error) {
 		ID:     store.keyWithPrefix(id),
 	}
 
-	r, err := store.Service.ReadObject(ctx, params)
-	if err != nil {
-		return nil, err
-	}
-
-	return r, nil
+	return store.Service.ReadObject(ctx, params)
 }
 
 func (store GCSStore) keyWithPrefix(key string) string {

pkg/gcsstore/gcsstore_mock_test.go

@@ -6,36 +6,37 @@ package gcsstore_test
 
 import (
 	context "context"
-	gomock "github.com/golang/mock/gomock"
-	gcsstore "github.com/tus/tusd/pkg/gcsstore"
 	io "io"
 	reflect "reflect"
+
+	gomock "github.com/golang/mock/gomock"
+	gcsstore "github.com/tus/tusd/pkg/gcsstore"
 )
 
-// MockGCSReader is a mock of GCSReader interface
+// MockGCSReader is a mock of GCSReader interface.
 type MockGCSReader struct {
 	ctrl     *gomock.Controller
 	recorder *MockGCSReaderMockRecorder
 }
 
-// MockGCSReaderMockRecorder is the mock recorder for MockGCSReader
+// MockGCSReaderMockRecorder is the mock recorder for MockGCSReader.
 type MockGCSReaderMockRecorder struct {
 	mock *MockGCSReader
 }
 
-// NewMockGCSReader creates a new mock instance
+// NewMockGCSReader creates a new mock instance.
 func NewMockGCSReader(ctrl *gomock.Controller) *MockGCSReader {
 	mock := &MockGCSReader{ctrl: ctrl}
 	mock.recorder = &MockGCSReaderMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockGCSReader) EXPECT() *MockGCSReaderMockRecorder {
 	return m.recorder
 }
 
-// Close mocks base method
+// Close mocks base method.
 func (m *MockGCSReader) Close() error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Close")
@@ -43,13 +44,13 @@ func (m *MockGCSReader) Close() error {
 	return ret0
 }
 
-// Close indicates an expected call of Close
+// Close indicates an expected call of Close.
 func (mr *MockGCSReaderMockRecorder) Close() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Close", reflect.TypeOf((*MockGCSReader)(nil).Close))
 }
 
-// ContentType mocks base method
+// ContentType mocks base method.
 func (m *MockGCSReader) ContentType() string {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "ContentType")
@@ -57,13 +58,13 @@ func (m *MockGCSReader) ContentType() string {
 	return ret0
 }
 
-// ContentType indicates an expected call of ContentType
+// ContentType indicates an expected call of ContentType.
 func (mr *MockGCSReaderMockRecorder) ContentType() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ContentType", reflect.TypeOf((*MockGCSReader)(nil).ContentType))
 }
 
-// Read mocks base method
+// Read mocks base method.
 func (m *MockGCSReader) Read(arg0 []byte) (int, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Read", arg0)
@@ -72,13 +73,13 @@ func (m *MockGCSReader) Read(arg0 []byte) (int, error) {
 	return ret0, ret1
 }
 
-// Read indicates an expected call of Read
+// Read indicates an expected call of Read.
 func (mr *MockGCSReaderMockRecorder) Read(arg0 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Read", reflect.TypeOf((*MockGCSReader)(nil).Read), arg0)
 }
 
-// Remain mocks base method
+// Remain mocks base method.
 func (m *MockGCSReader) Remain() int64 {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Remain")
@@ -86,13 +87,13 @@ func (m *MockGCSReader) Remain() int64 {
 	return ret0
 }
 
-// Remain indicates an expected call of Remain
+// Remain indicates an expected call of Remain.
 func (mr *MockGCSReaderMockRecorder) Remain() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Remain", reflect.TypeOf((*MockGCSReader)(nil).Remain))
 }
 
-// Size mocks base method
+// Size mocks base method.
 func (m *MockGCSReader) Size() int64 {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Size")
@@ -100,36 +101,36 @@ func (m *MockGCSReader) Size() int64 {
 	return ret0
 }
 
-// Size indicates an expected call of Size
+// Size indicates an expected call of Size.
 func (mr *MockGCSReaderMockRecorder) Size() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Size", reflect.TypeOf((*MockGCSReader)(nil).Size))
 }
 
-// MockGCSAPI is a mock of GCSAPI interface
+// MockGCSAPI is a mock of GCSAPI interface.
 type MockGCSAPI struct {
 	ctrl     *gomock.Controller
 	recorder *MockGCSAPIMockRecorder
 }
 
-// MockGCSAPIMockRecorder is the mock recorder for MockGCSAPI
+// MockGCSAPIMockRecorder is the mock recorder for MockGCSAPI.
 type MockGCSAPIMockRecorder struct {
 	mock *MockGCSAPI
 }
 
-// NewMockGCSAPI creates a new mock instance
+// NewMockGCSAPI creates a new mock instance.
 func NewMockGCSAPI(ctrl *gomock.Controller) *MockGCSAPI {
 	mock := &MockGCSAPI{ctrl: ctrl}
 	mock.recorder = &MockGCSAPIMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockGCSAPI) EXPECT() *MockGCSAPIMockRecorder {
 	return m.recorder
 }
 
-// ComposeObjects mocks base method
+// ComposeObjects mocks base method.
 func (m *MockGCSAPI) ComposeObjects(arg0 context.Context, arg1 gcsstore.GCSComposeParams) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "ComposeObjects", arg0, arg1)
@@ -137,13 +138,13 @@ func (m *MockGCSAPI) ComposeObjects(arg0 context.Context, arg1 gcsstore.GCSCompo
 	return ret0
 }
 
-// ComposeObjects indicates an expected call of ComposeObjects
+// ComposeObjects indicates an expected call of ComposeObjects.
 func (mr *MockGCSAPIMockRecorder) ComposeObjects(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ComposeObjects", reflect.TypeOf((*MockGCSAPI)(nil).ComposeObjects), arg0, arg1)
 }
 
-// DeleteObject mocks base method
+// DeleteObject mocks base method.
 func (m *MockGCSAPI) DeleteObject(arg0 context.Context, arg1 gcsstore.GCSObjectParams) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "DeleteObject", arg0, arg1)
@@ -151,13 +152,13 @@ func (m *MockGCSAPI) DeleteObject(arg0 context.Context, arg1 gcsstore.GCSObjectP
 	return ret0
 }
 
-// DeleteObject indicates an expected call of DeleteObject
+// DeleteObject indicates an expected call of DeleteObject.
 func (mr *MockGCSAPIMockRecorder) DeleteObject(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "DeleteObject", reflect.TypeOf((*MockGCSAPI)(nil).DeleteObject), arg0, arg1)
 }
 
-// DeleteObjectsWithFilter mocks base method
+// DeleteObjectsWithFilter mocks base method.
 func (m *MockGCSAPI) DeleteObjectsWithFilter(arg0 context.Context, arg1 gcsstore.GCSFilterParams) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "DeleteObjectsWithFilter", arg0, arg1)
@@ -165,13 +166,13 @@ func (m *MockGCSAPI) DeleteObjectsWithFilter(arg0 context.Context, arg1 gcsstore
 	return ret0
 }
 
-// DeleteObjectsWithFilter indicates an expected call of DeleteObjectsWithFilter
+// DeleteObjectsWithFilter indicates an expected call of DeleteObjectsWithFilter.
 func (mr *MockGCSAPIMockRecorder) DeleteObjectsWithFilter(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "DeleteObjectsWithFilter", reflect.TypeOf((*MockGCSAPI)(nil).DeleteObjectsWithFilter), arg0, arg1)
 }
 
-// FilterObjects mocks base method
+// FilterObjects mocks base method.
 func (m *MockGCSAPI) FilterObjects(arg0 context.Context, arg1 gcsstore.GCSFilterParams) ([]string, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "FilterObjects", arg0, arg1)
@@ -180,13 +181,13 @@ func (m *MockGCSAPI) FilterObjects(arg0 context.Context, arg1 gcsstore.GCSFilter
 	return ret0, ret1
 }
 
-// FilterObjects indicates an expected call of FilterObjects
+// FilterObjects indicates an expected call of FilterObjects.
 func (mr *MockGCSAPIMockRecorder) FilterObjects(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "FilterObjects", reflect.TypeOf((*MockGCSAPI)(nil).FilterObjects), arg0, arg1)
 }
 
-// GetObjectSize mocks base method
+// GetObjectSize mocks base method.
 func (m *MockGCSAPI) GetObjectSize(arg0 context.Context, arg1 gcsstore.GCSObjectParams) (int64, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "GetObjectSize", arg0, arg1)
@@ -195,13 +196,13 @@ func (m *MockGCSAPI) GetObjectSize(arg0 context.Context, arg1 gcsstore.GCSObject
 	return ret0, ret1
 }
 
-// GetObjectSize indicates an expected call of GetObjectSize
+// GetObjectSize indicates an expected call of GetObjectSize.
 func (mr *MockGCSAPIMockRecorder) GetObjectSize(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetObjectSize", reflect.TypeOf((*MockGCSAPI)(nil).GetObjectSize), arg0, arg1)
 }
 
-// ReadObject mocks base method
+// ReadObject mocks base method.
 func (m *MockGCSAPI) ReadObject(arg0 context.Context, arg1 gcsstore.GCSObjectParams) (gcsstore.GCSReader, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "ReadObject", arg0, arg1)
@@ -210,13 +211,13 @@ func (m *MockGCSAPI) ReadObject(arg0 context.Context, arg1 gcsstore.GCSObjectPar
 	return ret0, ret1
 }
 
-// ReadObject indicates an expected call of ReadObject
+// ReadObject indicates an expected call of ReadObject.
 func (mr *MockGCSAPIMockRecorder) ReadObject(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ReadObject", reflect.TypeOf((*MockGCSAPI)(nil).ReadObject), arg0, arg1)
 }
 
-// SetObjectMetadata mocks base method
+// SetObjectMetadata mocks base method.
 func (m *MockGCSAPI) SetObjectMetadata(arg0 context.Context, arg1 gcsstore.GCSObjectParams, arg2 map[string]string) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "SetObjectMetadata", arg0, arg1, arg2)
@@ -224,13 +225,13 @@ func (m *MockGCSAPI) SetObjectMetadata(arg0 context.Context, arg1 gcsstore.GCSOb
 	return ret0
 }
 
-// SetObjectMetadata indicates an expected call of SetObjectMetadata
+// SetObjectMetadata indicates an expected call of SetObjectMetadata.
 func (mr *MockGCSAPIMockRecorder) SetObjectMetadata(arg0, arg1, arg2 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "SetObjectMetadata", reflect.TypeOf((*MockGCSAPI)(nil).SetObjectMetadata), arg0, arg1, arg2)
 }
 
-// WriteObject mocks base method
+// WriteObject mocks base method.
 func (m *MockGCSAPI) WriteObject(arg0 context.Context, arg1 gcsstore.GCSObjectParams, arg2 io.Reader) (int64, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "WriteObject", arg0, arg1, arg2)
@@ -239,7 +240,7 @@ func (m *MockGCSAPI) WriteObject(arg0 context.Context, arg1 gcsstore.GCSObjectPa
 	return ret0, ret1
 }
 
-// WriteObject indicates an expected call of WriteObject
+// WriteObject indicates an expected call of WriteObject.
 func (mr *MockGCSAPIMockRecorder) WriteObject(arg0, arg1, arg2 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "WriteObject", reflect.TypeOf((*MockGCSAPI)(nil).WriteObject), arg0, arg1, arg2)

pkg/handler/body_reader.go

@@ -14,13 +14,15 @@ import (
 // In addition, the bodyReader keeps track of how many bytes were read.
 type bodyReader struct {
 	reader       io.Reader
+	closer       io.Closer
 	err          error
 	bytesCounter int64
 }
 
-func newBodyReader(r io.Reader) *bodyReader {
+func newBodyReader(r io.ReadCloser, maxSize int64) *bodyReader {
 	return &bodyReader{
-		reader: r,
+		reader: io.LimitReader(r, maxSize),
+		closer: r,
 	}
 }
 
@@ -51,3 +53,8 @@ func (r bodyReader) hasError() error {
 func (r *bodyReader) bytesRead() int64 {
 	return atomic.LoadInt64(&r.bytesCounter)
 }
+
+func (r *bodyReader) closeWithError(err error) {
+	r.closer.Close()
+	r.err = err
+}

pkg/handler/concat_test.go

@@ -1,7 +1,6 @@
 package handler_test
 
 import (
-	"context"
 	"net/http"
 	"strings"
 	"testing"
@@ -38,14 +37,14 @@ func TestConcat(t *testing.T) {
 			upload := NewMockFullUpload(ctrl)
 
 			gomock.InOrder(
-				store.EXPECT().NewUpload(context.Background(), FileInfo{
+				store.EXPECT().NewUpload(gomock.Any(), FileInfo{
 					Size:           300,
 					IsPartial:      true,
 					IsFinal:        false,
 					PartialUploads: nil,
 					MetaData:       make(map[string]string),
 				}).Return(upload, nil),
-				upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+				upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 					ID:             "foo",
 					Size:           300,
 					IsPartial:      true,
@@ -77,8 +76,8 @@ func TestConcat(t *testing.T) {
 			upload := NewMockFullUpload(ctrl)
 
 			gomock.InOrder(
-				store.EXPECT().GetUpload(context.Background(), "foo").Return(upload, nil),
-				upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+				store.EXPECT().GetUpload(gomock.Any(), "foo").Return(upload, nil),
+				upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 					ID:        "foo",
 					IsPartial: true,
 				}, nil),
@@ -114,26 +113,26 @@ func TestConcat(t *testing.T) {
 			uploadC := NewMockFullUpload(ctrl)
 
 			gomock.InOrder(
-				store.EXPECT().GetUpload(context.Background(), "a").Return(uploadA, nil),
-				uploadA.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+				store.EXPECT().GetUpload(gomock.Any(), "a").Return(uploadA, nil),
+				uploadA.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 					IsPartial: true,
 					Size:      5,
 					Offset:    5,
 				}, nil),
-				store.EXPECT().GetUpload(context.Background(), "b").Return(uploadB, nil),
-				uploadB.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+				store.EXPECT().GetUpload(gomock.Any(), "b").Return(uploadB, nil),
+				uploadB.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 					IsPartial: true,
 					Size:      5,
 					Offset:    5,
 				}, nil),
-				store.EXPECT().NewUpload(context.Background(), FileInfo{
+				store.EXPECT().NewUpload(gomock.Any(), FileInfo{
 					Size:           10,
 					IsPartial:      false,
 					IsFinal:        true,
 					PartialUploads: []string{"a", "b"},
 					MetaData:       make(map[string]string),
 				}).Return(uploadC, nil),
-				uploadC.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+				uploadC.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 					ID:             "foo",
 					Size:           10,
 					IsPartial:      false,
@@ -142,7 +141,7 @@ func TestConcat(t *testing.T) {
 					MetaData:       make(map[string]string),
 				}, nil),
 				store.EXPECT().AsConcatableUpload(uploadC).Return(uploadC),
-				uploadC.EXPECT().ConcatUploads(context.Background(), []Upload{uploadA, uploadB}).Return(nil),
+				uploadC.EXPECT().ConcatUploads(gomock.Any(), []Upload{uploadA, uploadB}).Return(nil),
 			)
 
 			handler, _ := NewHandler(Config{
@@ -188,8 +187,8 @@ func TestConcat(t *testing.T) {
 			upload := NewMockFullUpload(ctrl)
 
 			gomock.InOrder(
-				store.EXPECT().GetUpload(context.Background(), "foo").Return(upload, nil),
-				upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+				store.EXPECT().GetUpload(gomock.Any(), "foo").Return(upload, nil),
+				upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 					ID:             "foo",
 					IsFinal:        true,
 					PartialUploads: []string{"a", "b"},
@@ -226,8 +225,8 @@ func TestConcat(t *testing.T) {
 			// This upload is still unfinished (mismatching offset and size) and
 			// will therefore cause the POST request to fail.
 			gomock.InOrder(
-				store.EXPECT().GetUpload(context.Background(), "c").Return(upload, nil),
-				upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+				store.EXPECT().GetUpload(gomock.Any(), "c").Return(upload, nil),
+				upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 					ID:        "c",
 					IsPartial: true,
 					Size:      5,
@@ -256,8 +255,8 @@ func TestConcat(t *testing.T) {
 			upload := NewMockFullUpload(ctrl)
 
 			gomock.InOrder(
-				store.EXPECT().GetUpload(context.Background(), "huge").Return(upload, nil),
-				upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+				store.EXPECT().GetUpload(gomock.Any(), "huge").Return(upload, nil),
+				upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 					ID:     "huge",
 					Size:   1000,
 					Offset: 1000,
@@ -286,8 +285,8 @@ func TestConcat(t *testing.T) {
 			upload := NewMockFullUpload(ctrl)
 
 			gomock.InOrder(
-				store.EXPECT().GetUpload(context.Background(), "foo").Return(upload, nil),
-				upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+				store.EXPECT().GetUpload(gomock.Any(), "foo").Return(upload, nil),
+				upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 					ID:      "foo",
 					Size:    10,
 					Offset:  0,

pkg/handler/config.go

@@ -5,6 +5,7 @@ import (
 	"log"
 	"net/url"
 	"os"
+	"time"
 )
 
 // Config provides a way to configure the Handler depending on your needs.
@@ -40,6 +41,10 @@ type Config struct {
 	// NotifyCreatedUploads indicates whether sending notifications about
 	// the upload having been created using the CreatedUploads channel should be enabled.
 	NotifyCreatedUploads bool
+	// UploadProgressInterval specifies the interval at which the upload progress
+	// notifications are sent to the UploadProgress channel, if enabled.
+	// Defaults to 1s.
+	UploadProgressInterval time.Duration
 	// Logger is the logger to use internally, mostly for printing requests.
 	Logger *log.Logger
 	// Respect the X-Forwarded-Host, X-Forwarded-Proto and Forwarded headers
@@ -47,14 +52,18 @@ type Config struct {
 	// response to POST requests.
 	RespectForwardedHeaders bool
 	// PreUploadCreateCallback will be invoked before a new upload is created, if the
-	// property is supplied. If the callback returns nil, the upload will be created.
-	// Otherwise the HTTP request will be aborted. This can be used to implement
-	// validation of upload metadata etc.
-	PreUploadCreateCallback func(hook HookEvent) error
+	// property is supplied. If the callback returns no error, the upload will be created
+	// and optional values from HTTPResponse will be contained in the HTTP response.
+	// If the error is non-nil, the upload will not be created. This can be used to implement
+	// validation of upload metadata etc. Furthermore, HTTPResponse will be ignored and
+	// the error value can contain values for the HTTP response.
+	PreUploadCreateCallback func(hook HookEvent) (HTTPResponse, error)
 	// PreFinishResponseCallback will be invoked after an upload is completed but before
-	// a response is returned to the client. Error responses from the callback will be passed
-	// back to the client. This can be used to implement post-processing validation.
-	PreFinishResponseCallback func(hook HookEvent) error
+	// a response is returned to the client. This can be used to implement post-processing validation.
+	// If the callback returns no error, optional values from HTTPResponse will be contained in the HTTP response.
+	// If the error is non-nil, the error will be forwarded to the client. Furthermore,
+	// HTTPResponse will be ignored and the error value can contain values for the HTTP response.
+	PreFinishResponseCallback func(hook HookEvent) (HTTPResponse, error)
 }
 
 func (config *Config) validate() error {
@@ -88,5 +97,9 @@ func (config *Config) validate() error {
 		return errors.New("tusd: StoreComposer in Config needs to contain a non-nil core")
 	}
 
+	if config.UploadProgressInterval <= 0 {
+		config.UploadProgressInterval = 1 * time.Second
+	}
+
 	return nil
 }

pkg/handler/context.go

@@ -0,0 +1,28 @@
+package handler
+
+import (
+	"context"
+	"net/http"
+)
+
+// httpContext is wrapper around context.Context that also carries the
+// corresponding HTTP request and response writer, as well as an
+// optional body reader
+// TODO: Consider including HTTPResponse as well
+type httpContext struct {
+	context.Context
+
+	res  http.ResponseWriter
+	req  *http.Request
+	body *bodyReader
+}
+
+func newContext(w http.ResponseWriter, r *http.Request) *httpContext {
+	return &httpContext{
+		// TODO: Try to reuse the request's context in the future
+		Context: context.Background(),
+		res:     w,
+		req:     r,
+		body:    nil, // body can be filled later for PATCH requests
+	}
+}

pkg/handler/datastore.go

@@ -7,7 +7,9 @@ import (
 
 type MetaData map[string]string
 
+// FileInfo contains information about a single upload resource.
 type FileInfo struct {
+	// ID is the unique identifier of the upload resource.
 	ID string
 	// Total file size in bytes specified in the NewUpload call
 	Size int64
@@ -41,6 +43,7 @@ type FileInfo struct {
 // more data. Furthermore, a response is sent to notify the client of the
 // interrupting and the upload is terminated (if supported by the data store),
 // so the upload cannot be resumed anymore.
+// TODO: Allow passing in a HTTP Response
 func (f FileInfo) StopUpload() {
 	if f.stopUpload != nil {
 		f.stopUpload()
@@ -60,14 +63,12 @@ type Upload interface {
 	// requests. It may return an os.ErrNotExist which will be interpreted as a
 	// 404 Not Found.
 	GetInfo(ctx context.Context) (FileInfo, error)
-	// GetReader returns a reader which allows iterating of the content of an
+	// GetReader returns an io.ReadCloser which allows iterating of the content of an
 	// upload specified by its ID. It should attempt to provide a reader even if
 	// the upload has not been finished yet but it's not required.
-	// If the returned reader also implements the io.Closer interface, the
-	// Close() method will be invoked once everything has been read.
 	// If the given upload could not be found, the error tusd.ErrNotFound should
 	// be returned.
-	GetReader(ctx context.Context) (io.Reader, error)
+	GetReader(ctx context.Context) (io.ReadCloser, error)
 	// FinisherDataStore is the interface which can be implemented by DataStores
 	// which need to do additional operations once an entire upload has been
 	// completed. These tasks may include but are not limited to freeing unused
@@ -146,11 +147,15 @@ type Locker interface {
 type Lock interface {
 	// Lock attempts to obtain an exclusive lock for the upload specified
 	// by its id.
-	// If this operation fails because the resource is already locked, the
-	// tusd.ErrFileLocked must be returned. If no error is returned, the attempt
-	// is consider to be successful and the upload to be locked until UnlockUpload
-	// is invoked for the same upload.
-	Lock() error
+	// If the lock can be acquired, it will return without error. The requestUnlock
+	// callback is invoked when another caller attempts to create a lock. In this
+	// case, the holder of the lock should attempt to release the lock as soon
+	// as possible
+	// If the lock is already held, the holder's requestUnlock function will be
+	// invoked to request the lock to be released. If the context is cancelled before
+	// the lock can be acquired, ErrLockTimeout will be returned without acquiring
+	// the lock.
+	Lock(ctx context.Context, requestUnlock func()) error
 	// Unlock releases an existing lock for the given upload.
 	Unlock() error
 }

pkg/handler/error.go

@@ -0,0 +1,34 @@
+package handler
+
+// Error represents an error with the intent to be sent in the HTTP
+// response to the client. Therefore, it also contains a HTTPResponse,
+// next to an error code and error message.
+// TODO: Error is not comparable anymore because HTTPResponse
+// contains a map. See if we should change this.
+type Error struct {
+	ErrorCode    string
+	Message      string
+	HTTPResponse HTTPResponse
+}
+
+func (e Error) Error() string {
+	return e.ErrorCode + ": " + e.Message
+}
+
+// NewError constructs a new Error object with the given error code and message.
+// The corresponding HTTP response will have the provided status code
+// and a body consisting of the error details.
+// responses. See the net/http package for standardized status codes.
+func NewError(errCode string, message string, statusCode int) Error {
+	return Error{
+		ErrorCode: errCode,
+		Message:   message,
+		HTTPResponse: HTTPResponse{
+			StatusCode: statusCode,
+			Body:       errCode + ": " + message + "\n",
+			Headers: HTTPHeaders{
+				"Content-Type": "text/plain; charset=utf-8",
+			},
+		},
+	}
+}

pkg/handler/get_test.go

@@ -1,7 +1,6 @@
 package handler_test
 
 import (
-	"context"
 	"net/http"
 	"strings"
 	"testing"
@@ -34,9 +33,9 @@ func TestGet(t *testing.T) {
 
 		gomock.InOrder(
 			locker.EXPECT().NewLock("yes").Return(lock, nil),
-			lock.EXPECT().Lock().Return(nil),
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			lock.EXPECT().Lock(gomock.Any(), gomock.Any()).Return(nil),
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload, nil),
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				Offset: 5,
 				Size:   20,
 				MetaData: map[string]string{
@@ -44,7 +43,7 @@ func TestGet(t *testing.T) {
 					"filetype": "image/jpeg",
 				},
 			}, nil),
-			upload.EXPECT().GetReader(context.Background()).Return(reader, nil),
+			upload.EXPECT().GetReader(gomock.Any()).Return(reader, nil),
 			lock.EXPECT().Unlock().Return(nil),
 		)
 
@@ -79,8 +78,8 @@ func TestGet(t *testing.T) {
 		upload := NewMockFullUpload(ctrl)
 
 		gomock.InOrder(
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload, nil),
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				Offset: 0,
 			}, nil),
 		)
@@ -107,8 +106,8 @@ func TestGet(t *testing.T) {
 		upload := NewMockFullUpload(ctrl)
 
 		gomock.InOrder(
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload, nil),
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				Offset: 0,
 				MetaData: map[string]string{
 					"filetype": "non-a-valid-mime-type",
@@ -139,8 +138,8 @@ func TestGet(t *testing.T) {
 		upload := NewMockFullUpload(ctrl)
 
 		gomock.InOrder(
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload, nil),
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				Offset: 0,
 				MetaData: map[string]string{
 					"filetype": "application/vnd.openxmlformats-officedocument.wordprocessingml.document.v1",

pkg/handler/handler_mock_test.go

@@ -6,51 +6,79 @@ package handler_test
 
 import (
 	context "context"
-	gomock "github.com/golang/mock/gomock"
-	handler "github.com/tus/tusd/pkg/handler"
 	io "io"
 	reflect "reflect"
+
+	gomock "github.com/golang/mock/gomock"
+	handler "github.com/tus/tusd/pkg/handler"
 )
 
-// MockFullDataStore is a mock of FullDataStore interface
+// MockFullDataStore is a mock of FullDataStore interface.
 type MockFullDataStore struct {
 	ctrl     *gomock.Controller
 	recorder *MockFullDataStoreMockRecorder
 }
 
-// MockFullDataStoreMockRecorder is the mock recorder for MockFullDataStore
+// MockFullDataStoreMockRecorder is the mock recorder for MockFullDataStore.
 type MockFullDataStoreMockRecorder struct {
 	mock *MockFullDataStore
 }
 
-// NewMockFullDataStore creates a new mock instance
+// NewMockFullDataStore creates a new mock instance.
 func NewMockFullDataStore(ctrl *gomock.Controller) *MockFullDataStore {
 	mock := &MockFullDataStore{ctrl: ctrl}
 	mock.recorder = &MockFullDataStoreMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockFullDataStore) EXPECT() *MockFullDataStoreMockRecorder {
 	return m.recorder
 }
 
-// NewUpload mocks base method
-func (m *MockFullDataStore) NewUpload(ctx context.Context, info handler.FileInfo) (handler.Upload, error) {
+// AsConcatableUpload mocks base method.
+func (m *MockFullDataStore) AsConcatableUpload(upload handler.Upload) handler.ConcatableUpload {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "NewUpload", ctx, info)
-	ret0, _ := ret[0].(handler.Upload)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
+	ret := m.ctrl.Call(m, "AsConcatableUpload", upload)
+	ret0, _ := ret[0].(handler.ConcatableUpload)
+	return ret0
 }
 
-// NewUpload indicates an expected call of NewUpload
-func (mr *MockFullDataStoreMockRecorder) NewUpload(ctx, info interface{}) *gomock.Call {
+// AsConcatableUpload indicates an expected call of AsConcatableUpload.
+func (mr *MockFullDataStoreMockRecorder) AsConcatableUpload(upload interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "NewUpload", reflect.TypeOf((*MockFullDataStore)(nil).NewUpload), ctx, info)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AsConcatableUpload", reflect.TypeOf((*MockFullDataStore)(nil).AsConcatableUpload), upload)
 }
 
-// GetUpload mocks base method
+// AsLengthDeclarableUpload mocks base method.
+func (m *MockFullDataStore) AsLengthDeclarableUpload(upload handler.Upload) handler.LengthDeclarableUpload {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "AsLengthDeclarableUpload", upload)
+	ret0, _ := ret[0].(handler.LengthDeclarableUpload)
+	return ret0
+}
+
+// AsLengthDeclarableUpload indicates an expected call of AsLengthDeclarableUpload.
+func (mr *MockFullDataStoreMockRecorder) AsLengthDeclarableUpload(upload interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AsLengthDeclarableUpload", reflect.TypeOf((*MockFullDataStore)(nil).AsLengthDeclarableUpload), upload)
+}
+
+// AsTerminatableUpload mocks base method.
+func (m *MockFullDataStore) AsTerminatableUpload(upload handler.Upload) handler.TerminatableUpload {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "AsTerminatableUpload", upload)
+	ret0, _ := ret[0].(handler.TerminatableUpload)
+	return ret0
+}
+
+// AsTerminatableUpload indicates an expected call of AsTerminatableUpload.
+func (mr *MockFullDataStoreMockRecorder) AsTerminatableUpload(upload interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AsTerminatableUpload", reflect.TypeOf((*MockFullDataStore)(nil).AsTerminatableUpload), upload)
+}
+
+// GetUpload mocks base method.
 func (m *MockFullDataStore) GetUpload(ctx context.Context, id string) (handler.Upload, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "GetUpload", ctx, id)
@@ -59,93 +87,93 @@ func (m *MockFullDataStore) GetUpload(ctx context.Context, id string) (handler.U
 	return ret0, ret1
 }
 
-// GetUpload indicates an expected call of GetUpload
+// GetUpload indicates an expected call of GetUpload.
 func (mr *MockFullDataStoreMockRecorder) GetUpload(ctx, id interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetUpload", reflect.TypeOf((*MockFullDataStore)(nil).GetUpload), ctx, id)
 }
 
-// AsTerminatableUpload mocks base method
-func (m *MockFullDataStore) AsTerminatableUpload(upload handler.Upload) handler.TerminatableUpload {
+// NewUpload mocks base method.
+func (m *MockFullDataStore) NewUpload(ctx context.Context, info handler.FileInfo) (handler.Upload, error) {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "AsTerminatableUpload", upload)
-	ret0, _ := ret[0].(handler.TerminatableUpload)
-	return ret0
+	ret := m.ctrl.Call(m, "NewUpload", ctx, info)
+	ret0, _ := ret[0].(handler.Upload)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
 }
 
-// AsTerminatableUpload indicates an expected call of AsTerminatableUpload
-func (mr *MockFullDataStoreMockRecorder) AsTerminatableUpload(upload interface{}) *gomock.Call {
+// NewUpload indicates an expected call of NewUpload.
+func (mr *MockFullDataStoreMockRecorder) NewUpload(ctx, info interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AsTerminatableUpload", reflect.TypeOf((*MockFullDataStore)(nil).AsTerminatableUpload), upload)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "NewUpload", reflect.TypeOf((*MockFullDataStore)(nil).NewUpload), ctx, info)
 }
 
-// AsConcatableUpload mocks base method
-func (m *MockFullDataStore) AsConcatableUpload(upload handler.Upload) handler.ConcatableUpload {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "AsConcatableUpload", upload)
-	ret0, _ := ret[0].(handler.ConcatableUpload)
-	return ret0
-}
-
-// AsConcatableUpload indicates an expected call of AsConcatableUpload
-func (mr *MockFullDataStoreMockRecorder) AsConcatableUpload(upload interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AsConcatableUpload", reflect.TypeOf((*MockFullDataStore)(nil).AsConcatableUpload), upload)
-}
-
-// AsLengthDeclarableUpload mocks base method
-func (m *MockFullDataStore) AsLengthDeclarableUpload(upload handler.Upload) handler.LengthDeclarableUpload {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "AsLengthDeclarableUpload", upload)
-	ret0, _ := ret[0].(handler.LengthDeclarableUpload)
-	return ret0
-}
-
-// AsLengthDeclarableUpload indicates an expected call of AsLengthDeclarableUpload
-func (mr *MockFullDataStoreMockRecorder) AsLengthDeclarableUpload(upload interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AsLengthDeclarableUpload", reflect.TypeOf((*MockFullDataStore)(nil).AsLengthDeclarableUpload), upload)
-}
-
-// MockFullUpload is a mock of FullUpload interface
+// MockFullUpload is a mock of FullUpload interface.
 type MockFullUpload struct {
 	ctrl     *gomock.Controller
 	recorder *MockFullUploadMockRecorder
 }
 
-// MockFullUploadMockRecorder is the mock recorder for MockFullUpload
+// MockFullUploadMockRecorder is the mock recorder for MockFullUpload.
 type MockFullUploadMockRecorder struct {
 	mock *MockFullUpload
 }
 
-// NewMockFullUpload creates a new mock instance
+// NewMockFullUpload creates a new mock instance.
 func NewMockFullUpload(ctrl *gomock.Controller) *MockFullUpload {
 	mock := &MockFullUpload{ctrl: ctrl}
 	mock.recorder = &MockFullUploadMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockFullUpload) EXPECT() *MockFullUploadMockRecorder {
 	return m.recorder
 }
 
-// WriteChunk mocks base method
-func (m *MockFullUpload) WriteChunk(ctx context.Context, offset int64, src io.Reader) (int64, error) {
+// ConcatUploads mocks base method.
+func (m *MockFullUpload) ConcatUploads(ctx context.Context, partialUploads []handler.Upload) error {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "WriteChunk", ctx, offset, src)
-	ret0, _ := ret[0].(int64)
-	ret1, _ := ret[1].(error)
-	return ret0, ret1
+	ret := m.ctrl.Call(m, "ConcatUploads", ctx, partialUploads)
+	ret0, _ := ret[0].(error)
+	return ret0
 }
 
-// WriteChunk indicates an expected call of WriteChunk
-func (mr *MockFullUploadMockRecorder) WriteChunk(ctx, offset, src interface{}) *gomock.Call {
+// ConcatUploads indicates an expected call of ConcatUploads.
+func (mr *MockFullUploadMockRecorder) ConcatUploads(ctx, partialUploads interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "WriteChunk", reflect.TypeOf((*MockFullUpload)(nil).WriteChunk), ctx, offset, src)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ConcatUploads", reflect.TypeOf((*MockFullUpload)(nil).ConcatUploads), ctx, partialUploads)
 }
 
-// GetInfo mocks base method
+// DeclareLength mocks base method.
+func (m *MockFullUpload) DeclareLength(ctx context.Context, length int64) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "DeclareLength", ctx, length)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// DeclareLength indicates an expected call of DeclareLength.
+func (mr *MockFullUploadMockRecorder) DeclareLength(ctx, length interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "DeclareLength", reflect.TypeOf((*MockFullUpload)(nil).DeclareLength), ctx, length)
+}
+
+// FinishUpload mocks base method.
+func (m *MockFullUpload) FinishUpload(ctx context.Context) error {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "FinishUpload", ctx)
+	ret0, _ := ret[0].(error)
+	return ret0
+}
+
+// FinishUpload indicates an expected call of FinishUpload.
+func (mr *MockFullUploadMockRecorder) FinishUpload(ctx interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "FinishUpload", reflect.TypeOf((*MockFullUpload)(nil).FinishUpload), ctx)
+}
+
+// GetInfo mocks base method.
 func (m *MockFullUpload) GetInfo(ctx context.Context) (handler.FileInfo, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "GetInfo", ctx)
@@ -154,42 +182,28 @@ func (m *MockFullUpload) GetInfo(ctx context.Context) (handler.FileInfo, error)
 	return ret0, ret1
 }
 
-// GetInfo indicates an expected call of GetInfo
+// GetInfo indicates an expected call of GetInfo.
 func (mr *MockFullUploadMockRecorder) GetInfo(ctx interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetInfo", reflect.TypeOf((*MockFullUpload)(nil).GetInfo), ctx)
 }
 
-// GetReader mocks base method
-func (m *MockFullUpload) GetReader(ctx context.Context) (io.Reader, error) {
+// GetReader mocks base method.
+func (m *MockFullUpload) GetReader(ctx context.Context) (io.ReadCloser, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "GetReader", ctx)
-	ret0, _ := ret[0].(io.Reader)
+	ret0, _ := ret[0].(io.ReadCloser)
 	ret1, _ := ret[1].(error)
 	return ret0, ret1
 }
 
-// GetReader indicates an expected call of GetReader
+// GetReader indicates an expected call of GetReader.
 func (mr *MockFullUploadMockRecorder) GetReader(ctx interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetReader", reflect.TypeOf((*MockFullUpload)(nil).GetReader), ctx)
 }
 
-// FinishUpload mocks base method
-func (m *MockFullUpload) FinishUpload(ctx context.Context) error {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "FinishUpload", ctx)
-	ret0, _ := ret[0].(error)
-	return ret0
-}
-
-// FinishUpload indicates an expected call of FinishUpload
-func (mr *MockFullUploadMockRecorder) FinishUpload(ctx interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "FinishUpload", reflect.TypeOf((*MockFullUpload)(nil).FinishUpload), ctx)
-}
-
-// Terminate mocks base method
+// Terminate mocks base method.
 func (m *MockFullUpload) Terminate(ctx context.Context) error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Terminate", ctx)
@@ -197,64 +211,51 @@ func (m *MockFullUpload) Terminate(ctx context.Context) error {
 	return ret0
 }
 
-// Terminate indicates an expected call of Terminate
+// Terminate indicates an expected call of Terminate.
 func (mr *MockFullUploadMockRecorder) Terminate(ctx interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Terminate", reflect.TypeOf((*MockFullUpload)(nil).Terminate), ctx)
 }
 
-// DeclareLength mocks base method
-func (m *MockFullUpload) DeclareLength(ctx context.Context, length int64) error {
+// WriteChunk mocks base method.
+func (m *MockFullUpload) WriteChunk(ctx context.Context, offset int64, src io.Reader) (int64, error) {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "DeclareLength", ctx, length)
-	ret0, _ := ret[0].(error)
-	return ret0
+	ret := m.ctrl.Call(m, "WriteChunk", ctx, offset, src)
+	ret0, _ := ret[0].(int64)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
 }
 
-// DeclareLength indicates an expected call of DeclareLength
-func (mr *MockFullUploadMockRecorder) DeclareLength(ctx, length interface{}) *gomock.Call {
+// WriteChunk indicates an expected call of WriteChunk.
+func (mr *MockFullUploadMockRecorder) WriteChunk(ctx, offset, src interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "DeclareLength", reflect.TypeOf((*MockFullUpload)(nil).DeclareLength), ctx, length)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "WriteChunk", reflect.TypeOf((*MockFullUpload)(nil).WriteChunk), ctx, offset, src)
 }
 
-// ConcatUploads mocks base method
-func (m *MockFullUpload) ConcatUploads(ctx context.Context, partialUploads []handler.Upload) error {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "ConcatUploads", ctx, partialUploads)
-	ret0, _ := ret[0].(error)
-	return ret0
-}
-
-// ConcatUploads indicates an expected call of ConcatUploads
-func (mr *MockFullUploadMockRecorder) ConcatUploads(ctx, partialUploads interface{}) *gomock.Call {
-	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ConcatUploads", reflect.TypeOf((*MockFullUpload)(nil).ConcatUploads), ctx, partialUploads)
-}
-
-// MockFullLocker is a mock of FullLocker interface
+// MockFullLocker is a mock of FullLocker interface.
 type MockFullLocker struct {
 	ctrl     *gomock.Controller
 	recorder *MockFullLockerMockRecorder
 }
 
-// MockFullLockerMockRecorder is the mock recorder for MockFullLocker
+// MockFullLockerMockRecorder is the mock recorder for MockFullLocker.
 type MockFullLockerMockRecorder struct {
 	mock *MockFullLocker
 }
 
-// NewMockFullLocker creates a new mock instance
+// NewMockFullLocker creates a new mock instance.
 func NewMockFullLocker(ctrl *gomock.Controller) *MockFullLocker {
 	mock := &MockFullLocker{ctrl: ctrl}
 	mock.recorder = &MockFullLockerMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockFullLocker) EXPECT() *MockFullLockerMockRecorder {
 	return m.recorder
 }
 
-// NewLock mocks base method
+// NewLock mocks base method.
 func (m *MockFullLocker) NewLock(id string) (handler.Lock, error) {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "NewLock", id)
@@ -263,50 +264,50 @@ func (m *MockFullLocker) NewLock(id string) (handler.Lock, error) {
 	return ret0, ret1
 }
 
-// NewLock indicates an expected call of NewLock
+// NewLock indicates an expected call of NewLock.
 func (mr *MockFullLockerMockRecorder) NewLock(id interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "NewLock", reflect.TypeOf((*MockFullLocker)(nil).NewLock), id)
 }
 
-// MockFullLock is a mock of FullLock interface
+// MockFullLock is a mock of FullLock interface.
 type MockFullLock struct {
 	ctrl     *gomock.Controller
 	recorder *MockFullLockMockRecorder
 }
 
-// MockFullLockMockRecorder is the mock recorder for MockFullLock
+// MockFullLockMockRecorder is the mock recorder for MockFullLock.
 type MockFullLockMockRecorder struct {
 	mock *MockFullLock
 }
 
-// NewMockFullLock creates a new mock instance
+// NewMockFullLock creates a new mock instance.
 func NewMockFullLock(ctrl *gomock.Controller) *MockFullLock {
 	mock := &MockFullLock{ctrl: ctrl}
 	mock.recorder = &MockFullLockMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockFullLock) EXPECT() *MockFullLockMockRecorder {
 	return m.recorder
 }
 
-// Lock mocks base method
-func (m *MockFullLock) Lock() error {
+// Lock mocks base method.
+func (m *MockFullLock) Lock(ctx context.Context, requestUnlock func()) error {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Lock")
+	ret := m.ctrl.Call(m, "Lock", ctx, requestUnlock)
 	ret0, _ := ret[0].(error)
 	return ret0
 }
 
-// Lock indicates an expected call of Lock
-func (mr *MockFullLockMockRecorder) Lock() *gomock.Call {
+// Lock indicates an expected call of Lock.
+func (mr *MockFullLockMockRecorder) Lock(ctx, requestUnlock interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Lock", reflect.TypeOf((*MockFullLock)(nil).Lock))
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Lock", reflect.TypeOf((*MockFullLock)(nil).Lock), ctx, requestUnlock)
 }
 
-// Unlock mocks base method
+// Unlock mocks base method.
 func (m *MockFullLock) Unlock() error {
 	m.ctrl.T.Helper()
 	ret := m.ctrl.Call(m, "Unlock")
@@ -314,7 +315,7 @@ func (m *MockFullLock) Unlock() error {
 	return ret0
 }
 
-// Unlock indicates an expected call of Unlock
+// Unlock indicates an expected call of Unlock.
 func (mr *MockFullLockMockRecorder) Unlock() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Unlock", reflect.TypeOf((*MockFullLock)(nil).Unlock))

pkg/handler/head_test.go

@@ -1,7 +1,6 @@
 package handler_test
 
 import (
-	"context"
 	"net/http"
 	"testing"
 
@@ -19,9 +18,9 @@ func TestHead(t *testing.T) {
 
 		gomock.InOrder(
 			locker.EXPECT().NewLock("yes").Return(lock, nil),
-			lock.EXPECT().Lock().Return(nil),
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			lock.EXPECT().Lock(gomock.Any(), gomock.Any()).Return(nil),
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload, nil),
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				Offset: 11,
 				Size:   44,
 				MetaData: map[string]string{
@@ -64,7 +63,7 @@ func TestHead(t *testing.T) {
 	})
 
 	SubTest(t, "UploadNotFoundFail", func(t *testing.T, store *MockFullDataStore, composer *StoreComposer) {
-		store.EXPECT().GetUpload(context.Background(), "no").Return(nil, ErrNotFound)
+		store.EXPECT().GetUpload(gomock.Any(), "no").Return(nil, ErrNotFound)
 
 		handler, _ := NewHandler(Config{
 			StoreComposer: composer,
@@ -76,10 +75,8 @@ func TestHead(t *testing.T) {
 			ReqHeader: map[string]string{
 				"Tus-Resumable": "1.0.0",
 			},
-			Code: http.StatusNotFound,
-			ResHeader: map[string]string{
-				"Content-Length": "0",
-			},
+			Code:      http.StatusNotFound,
+			ResHeader: map[string]string{},
 		}).Run(handler, t)
 
 		if res.Body.String() != "" {
@@ -93,8 +90,8 @@ func TestHead(t *testing.T) {
 		upload := NewMockFullUpload(ctrl)
 
 		gomock.InOrder(
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload, nil),
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				SizeIsDeferred: true,
 				Size:           0,
 			}, nil),
@@ -123,8 +120,8 @@ func TestHead(t *testing.T) {
 		upload := NewMockFullUpload(ctrl)
 
 		gomock.InOrder(
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload, nil),
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				SizeIsDeferred: false,
 				Size:           10,
 			}, nil),

pkg/handler/hooks.go

@@ -0,0 +1,25 @@
+package handler
+
+import "net/http"
+
+// HookEvent represents an event from tusd which can be handled by the application.
+type HookEvent struct {
+	// Upload contains information about the upload that caused this hook
+	// to be fired.
+	Upload FileInfo
+	// HTTPRequest contains details about the HTTP request that reached
+	// tusd.
+	HTTPRequest HTTPRequest
+}
+
+func newHookEvent(info FileInfo, r *http.Request) HookEvent {
+	return HookEvent{
+		Upload: info,
+		HTTPRequest: HTTPRequest{
+			Method:     r.Method,
+			URI:        r.RequestURI,
+			RemoteAddr: r.RemoteAddr,
+			Header:     r.Header,
+		},
+	}
+}

pkg/handler/http.go

@@ -0,0 +1,80 @@
+package handler
+
+import (
+	"net/http"
+	"strconv"
+)
+
+// HTTPRequest contains basic details of an incoming HTTP request.
+type HTTPRequest struct {
+	// Method is the HTTP method, e.g. POST or PATCH.
+	Method string
+	// URI is the full HTTP request URI, e.g. /files/fooo.
+	URI string
+	// RemoteAddr contains the network address that sent the request.
+	RemoteAddr string
+	// Header contains all HTTP headers as present in the HTTP request.
+	Header http.Header
+}
+
+type HTTPHeaders map[string]string
+
+// HTTPResponse contains basic details of an outgoing HTTP response.
+type HTTPResponse struct {
+	// StatusCode is status code, e.g. 200 or 400.
+	StatusCode int
+	// Body is the response body.
+	Body string
+	// Headers contains additional HTTP headers for the response.
+	// TODO: Uniform naming with HTTPRequest.Header
+	Headers HTTPHeaders
+}
+
+// writeTo writes the HTTP response into w, as specified by the fields in resp.
+func (resp HTTPResponse) writeTo(w http.ResponseWriter) {
+	headers := w.Header()
+	for key, value := range resp.Headers {
+		headers.Set(key, value)
+	}
+
+	if len(resp.Body) > 0 {
+		headers.Set("Content-Length", strconv.Itoa(len(resp.Body)))
+	}
+
+	w.WriteHeader(resp.StatusCode)
+
+	if len(resp.Body) > 0 {
+		w.Write([]byte(resp.Body))
+	}
+}
+
+// MergeWith returns a copy of resp1, where non-default values from resp2 overwrite
+// values from resp1.
+func (resp1 HTTPResponse) MergeWith(resp2 HTTPResponse) HTTPResponse {
+	// Clone the response 1 and use it as a basis
+	newResp := resp1
+
+	// Take the status code and body from response 2 to
+	// overwrite values from response 1.
+	if resp2.StatusCode != 0 {
+		newResp.StatusCode = resp2.StatusCode
+	}
+
+	if len(resp2.Body) > 0 {
+		newResp.Body = resp2.Body
+	}
+
+	// For the headers, me must make a new map to avoid writing
+	// into the header map from response 1.
+	newResp.Headers = make(HTTPHeaders, len(resp1.Headers)+len(resp2.Headers))
+
+	for key, value := range resp1.Headers {
+		newResp.Headers[key] = value
+	}
+
+	for key, value := range resp2.Headers {
+		newResp.Headers[key] = value
+	}
+
+	return newResp
+}

pkg/handler/metrics.go

@@ -1,7 +1,6 @@
 package handler
 
 import (
-	"errors"
 	"sync"
 	"sync/atomic"
 )
@@ -30,8 +29,9 @@ func (m Metrics) incRequestsTotal(method string) {
 	}
 }
 
+// TODO: Rework to only store error code
 // incErrorsTotal increases the counter for this error atomically by one.
-func (m Metrics) incErrorsTotal(err HTTPError) {
+func (m Metrics) incErrorsTotal(err Error) {
 	ptr := m.ErrorsTotal.retrievePointerFor(err)
 	atomic.AddUint64(ptr, 1)
 }
@@ -78,23 +78,16 @@ func newMetrics() Metrics {
 // ErrorsTotalMap stores the counters for the different HTTP errors.
 type ErrorsTotalMap struct {
 	lock    sync.RWMutex
-	counter map[simpleHTTPError]*uint64
+	counter map[ErrorsTotalMapEntry]*uint64
 }
 
-type simpleHTTPError struct {
-	Message    string
+type ErrorsTotalMapEntry struct {
+	ErrorCode  string
 	StatusCode int
 }
 
-func simplifyHTTPError(err HTTPError) simpleHTTPError {
-	return simpleHTTPError{
-		Message:    err.Error(),
-		StatusCode: err.StatusCode(),
-	}
-}
-
 func newErrorsTotalMap() *ErrorsTotalMap {
-	m := make(map[simpleHTTPError]*uint64, 20)
+	m := make(map[ErrorsTotalMapEntry]*uint64, 20)
 	return &ErrorsTotalMap{
 		counter: m,
 	}
@@ -102,8 +95,12 @@ func newErrorsTotalMap() *ErrorsTotalMap {
 
 // retrievePointerFor returns (after creating it if necessary) the pointer to
 // the counter for the error.
-func (e *ErrorsTotalMap) retrievePointerFor(err HTTPError) *uint64 {
-	serr := simplifyHTTPError(err)
+func (e *ErrorsTotalMap) retrievePointerFor(err Error) *uint64 {
+	serr := ErrorsTotalMapEntry{
+		ErrorCode:  err.ErrorCode,
+		StatusCode: err.HTTPResponse.StatusCode,
+	}
+
 	e.lock.RLock()
 	ptr, ok := e.counter[serr]
 	e.lock.RUnlock()
@@ -124,12 +121,11 @@ func (e *ErrorsTotalMap) retrievePointerFor(err HTTPError) *uint64 {
 }
 
 // Load retrieves the map of the counter pointers atomically
-func (e *ErrorsTotalMap) Load() map[HTTPError]*uint64 {
-	m := make(map[HTTPError]*uint64, len(e.counter))
+func (e *ErrorsTotalMap) Load() map[ErrorsTotalMapEntry]*uint64 {
+	m := make(map[ErrorsTotalMapEntry]*uint64, len(e.counter))
 	e.lock.RLock()
 	for err, ptr := range e.counter {
-		httpErr := NewHTTPError(errors.New(err.Message), err.StatusCode)
-		m[httpErr] = ptr
+		m[err] = ptr
 	}
 	e.lock.RUnlock()
 

pkg/handler/patch_test.go

@@ -1,7 +1,6 @@
 package handler_test
 
 import (
-	"context"
 	"errors"
 	"io"
 	"io/ioutil"
@@ -23,14 +22,14 @@ func TestPatch(t *testing.T) {
 		upload := NewMockFullUpload(ctrl)
 
 		gomock.InOrder(
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload, nil),
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				ID:     "yes",
 				Offset: 5,
 				Size:   10,
 			}, nil),
-			upload.EXPECT().WriteChunk(context.Background(), int64(5), NewReaderMatcher("hello")).Return(int64(5), nil),
-			upload.EXPECT().FinishUpload(context.Background()),
+			upload.EXPECT().WriteChunk(gomock.Any(), int64(5), NewReaderMatcher("hello")).Return(int64(5), nil),
+			upload.EXPECT().FinishUpload(gomock.Any()),
 		)
 
 		handler, _ := NewHandler(Config{
@@ -75,14 +74,14 @@ func TestPatch(t *testing.T) {
 		upload := NewMockFullUpload(ctrl)
 
 		gomock.InOrder(
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload, nil),
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				ID:     "yes",
 				Offset: 5,
 				Size:   10,
 			}, nil),
-			upload.EXPECT().WriteChunk(context.Background(), int64(5), NewReaderMatcher("hello")).Return(int64(5), nil),
-			upload.EXPECT().FinishUpload(context.Background()),
+			upload.EXPECT().WriteChunk(gomock.Any(), int64(5), NewReaderMatcher("hello")).Return(int64(5), nil),
+			upload.EXPECT().FinishUpload(gomock.Any()),
 		)
 
 		handler, _ := NewHandler(Config{
@@ -112,8 +111,8 @@ func TestPatch(t *testing.T) {
 		upload := NewMockFullUpload(ctrl)
 
 		gomock.InOrder(
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload, nil),
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				ID:     "yes",
 				Offset: 20,
 				Size:   20,
@@ -141,7 +140,7 @@ func TestPatch(t *testing.T) {
 	})
 
 	SubTest(t, "UploadNotFoundFail", func(t *testing.T, store *MockFullDataStore, composer *StoreComposer) {
-		store.EXPECT().GetUpload(context.Background(), "no").Return(nil, ErrNotFound)
+		store.EXPECT().GetUpload(gomock.Any(), "no").Return(nil, ErrNotFound)
 
 		handler, _ := NewHandler(Config{
 			StoreComposer: composer,
@@ -165,8 +164,8 @@ func TestPatch(t *testing.T) {
 		upload := NewMockFullUpload(ctrl)
 
 		gomock.InOrder(
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload, nil),
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				ID:     "yes",
 				Offset: 5,
 			}, nil),
@@ -194,8 +193,8 @@ func TestPatch(t *testing.T) {
 		upload := NewMockFullUpload(ctrl)
 
 		gomock.InOrder(
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload, nil),
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				ID:     "yes",
 				Offset: 5,
 				Size:   10,
@@ -268,14 +267,14 @@ func TestPatch(t *testing.T) {
 		upload := NewMockFullUpload(ctrl)
 
 		gomock.InOrder(
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload, nil),
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				ID:     "yes",
 				Offset: 5,
 				Size:   20,
 			}, nil),
-			upload.EXPECT().WriteChunk(context.Background(), int64(5), NewReaderMatcher("hellothisismore")).Return(int64(15), nil),
-			upload.EXPECT().FinishUpload(context.Background()),
+			upload.EXPECT().WriteChunk(gomock.Any(), int64(5), NewReaderMatcher("hellothisismore")).Return(int64(15), nil),
+			upload.EXPECT().FinishUpload(gomock.Any()),
 		)
 
 		handler, _ := NewHandler(Config{
@@ -310,17 +309,17 @@ func TestPatch(t *testing.T) {
 		upload := NewMockFullUpload(ctrl)
 
 		gomock.InOrder(
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload, nil),
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				ID:             "yes",
 				Offset:         5,
 				Size:           0,
 				SizeIsDeferred: true,
 			}, nil),
 			store.EXPECT().AsLengthDeclarableUpload(upload).Return(upload),
-			upload.EXPECT().DeclareLength(context.Background(), int64(20)),
-			upload.EXPECT().WriteChunk(context.Background(), int64(5), NewReaderMatcher("hellothisismore")).Return(int64(15), nil),
-			upload.EXPECT().FinishUpload(context.Background()),
+			upload.EXPECT().DeclareLength(gomock.Any(), int64(20)),
+			upload.EXPECT().WriteChunk(gomock.Any(), int64(5), NewReaderMatcher("hellothisismore")).Return(int64(15), nil),
+			upload.EXPECT().FinishUpload(gomock.Any()),
 		)
 
 		handler, _ := NewHandler(Config{
@@ -353,16 +352,16 @@ func TestPatch(t *testing.T) {
 		upload := NewMockFullUpload(ctrl)
 
 		gomock.InOrder(
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload, nil),
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				ID:             "yes",
 				Offset:         20,
 				Size:           0,
 				SizeIsDeferred: true,
 			}, nil),
 			store.EXPECT().AsLengthDeclarableUpload(upload).Return(upload),
-			upload.EXPECT().DeclareLength(context.Background(), int64(20)),
-			upload.EXPECT().FinishUpload(context.Background()),
+			upload.EXPECT().DeclareLength(gomock.Any(), int64(20)),
+			upload.EXPECT().FinishUpload(gomock.Any()),
 		)
 
 		handler, _ := NewHandler(Config{
@@ -392,26 +391,26 @@ func TestPatch(t *testing.T) {
 		upload2 := NewMockFullUpload(ctrl)
 
 		gomock.InOrder(
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload1, nil),
-			upload1.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload1, nil),
+			upload1.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				ID:             "yes",
 				Offset:         5,
 				Size:           0,
 				SizeIsDeferred: true,
 			}, nil),
 			store.EXPECT().AsLengthDeclarableUpload(upload1).Return(upload1),
-			upload1.EXPECT().DeclareLength(context.Background(), int64(20)),
-			upload1.EXPECT().WriteChunk(context.Background(), int64(5), NewReaderMatcher("hello")).Return(int64(5), nil),
+			upload1.EXPECT().DeclareLength(gomock.Any(), int64(20)),
+			upload1.EXPECT().WriteChunk(gomock.Any(), int64(5), NewReaderMatcher("hello")).Return(int64(5), nil),
 
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload2, nil),
-			upload2.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload2, nil),
+			upload2.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				ID:             "yes",
 				Offset:         10,
 				Size:           20,
 				SizeIsDeferred: false,
 			}, nil),
-			upload2.EXPECT().WriteChunk(context.Background(), int64(10), NewReaderMatcher("thisismore")).Return(int64(10), nil),
-			upload2.EXPECT().FinishUpload(context.Background()),
+			upload2.EXPECT().WriteChunk(gomock.Any(), int64(10), NewReaderMatcher("thisismore")).Return(int64(10), nil),
+			upload2.EXPECT().FinishUpload(gomock.Any()),
 		)
 
 		handler, _ := NewHandler(Config{
@@ -460,14 +459,14 @@ func TestPatch(t *testing.T) {
 
 		gomock.InOrder(
 			locker.EXPECT().NewLock("yes").Return(lock, nil),
-			lock.EXPECT().Lock().Return(nil),
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			lock.EXPECT().Lock(gomock.Any(), gomock.Any()).Return(nil),
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload, nil),
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				ID:     "yes",
 				Offset: 0,
 				Size:   20,
 			}, nil),
-			upload.EXPECT().WriteChunk(context.Background(), int64(0), NewReaderMatcher("hello")).Return(int64(5), nil),
+			upload.EXPECT().WriteChunk(gomock.Any(), int64(0), NewReaderMatcher("hello")).Return(int64(5), nil),
 			lock.EXPECT().Unlock().Return(nil),
 		)
 
@@ -500,13 +499,13 @@ func TestPatch(t *testing.T) {
 		// We simulate that the upload has already an offset of 10 bytes. Therefore, the progress notifications
 		// must be the sum of the exisiting offset and the newly read bytes.
 		gomock.InOrder(
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload, nil),
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				ID:     "yes",
 				Offset: 10,
 				Size:   100,
 			}, nil),
-			upload.EXPECT().WriteChunk(context.Background(), int64(10), NewReaderMatcher("first second third")).Return(int64(18), nil),
+			upload.EXPECT().WriteChunk(gomock.Any(), int64(10), NewReaderMatcher("first second third")).Return(int64(18), nil),
 		)
 
 		handler, _ := NewHandler(Config{
@@ -574,15 +573,15 @@ func TestPatch(t *testing.T) {
 		upload := NewMockFullUpload(ctrl)
 
 		gomock.InOrder(
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload, nil),
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				ID:     "yes",
 				Offset: 0,
 				Size:   100,
 			}, nil),
-			upload.EXPECT().WriteChunk(context.Background(), int64(0), NewReaderMatcher("first ")).Return(int64(6), nil),
+			upload.EXPECT().WriteChunk(gomock.Any(), int64(0), NewReaderMatcher("first ")).Return(int64(6), nil),
 			store.EXPECT().AsTerminatableUpload(upload).Return(upload),
-			upload.EXPECT().Terminate(context.Background()),
+			upload.EXPECT().Terminate(gomock.Any()),
 		)
 
 		handler, _ := NewHandler(Config{
@@ -629,7 +628,7 @@ func TestPatch(t *testing.T) {
 			ResHeader: map[string]string{
 				"Upload-Offset": "",
 			},
-			ResBody: "upload has been stopped by server\n",
+			ResBody: "ERR_UPLOAD_STOPPED: upload has been stopped by server\n",
 		}).Run(handler, t)
 
 		_, more := <-c
@@ -644,14 +643,14 @@ func TestPatch(t *testing.T) {
 		upload := NewMockFullUpload(ctrl)
 
 		gomock.InOrder(
-			store.EXPECT().GetUpload(context.Background(), "yes").Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			store.EXPECT().GetUpload(gomock.Any(), "yes").Return(upload, nil),
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				ID:     "yes",
 				Offset: 0,
 				Size:   100,
 			}, nil),
 			// The reader for WriteChunk must not return an error.
-			upload.EXPECT().WriteChunk(context.Background(), int64(0), NewReaderMatcher("first ")).Return(int64(6), nil),
+			upload.EXPECT().WriteChunk(gomock.Any(), int64(0), NewReaderMatcher("first ")).Return(int64(6), nil),
 		)
 
 		handler, _ := NewHandler(Config{
@@ -680,7 +679,7 @@ func TestPatch(t *testing.T) {
 			ResHeader: map[string]string{
 				"Upload-Offset": "",
 			},
-			ResBody: "an error while reading the body\n",
+			ResBody: "ERR_INTERNAL_SERVER_ERROR: an error while reading the body\n",
 		}).Run(handler, t)
 	})
 }

pkg/handler/post_test.go

@@ -2,7 +2,6 @@ package handler_test
 
 import (
 	"bytes"
-	"context"
 	"net/http"
 	"strings"
 	"testing"
@@ -20,7 +19,7 @@ func TestPost(t *testing.T) {
 		upload := NewMockFullUpload(ctrl)
 
 		gomock.InOrder(
-			store.EXPECT().NewUpload(context.Background(), FileInfo{
+			store.EXPECT().NewUpload(gomock.Any(), FileInfo{
 				Size: 300,
 				MetaData: map[string]string{
 					"foo":   "hello",
@@ -28,7 +27,7 @@ func TestPost(t *testing.T) {
 					"empty": "",
 				},
 			}).Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				ID:   "foo",
 				Size: 300,
 				MetaData: map[string]string{
@@ -76,16 +75,16 @@ func TestPost(t *testing.T) {
 		upload := NewMockFullUpload(ctrl)
 
 		gomock.InOrder(
-			store.EXPECT().NewUpload(context.Background(), FileInfo{
+			store.EXPECT().NewUpload(gomock.Any(), FileInfo{
 				Size:     0,
 				MetaData: map[string]string{},
 			}).Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				ID:       "foo",
 				Size:     0,
 				MetaData: map[string]string{},
 			}, nil),
-			upload.EXPECT().FinishUpload(context.Background()).Return(nil),
+			upload.EXPECT().FinishUpload(gomock.Any()).Return(nil),
 		)
 
 		handler, _ := NewHandler(Config{
@@ -211,11 +210,11 @@ func TestPost(t *testing.T) {
 			upload := NewMockFullUpload(ctrl)
 
 			gomock.InOrder(
-				store.EXPECT().NewUpload(context.Background(), FileInfo{
+				store.EXPECT().NewUpload(gomock.Any(), FileInfo{
 					Size:     300,
 					MetaData: map[string]string{},
 				}).Return(upload, nil),
-				upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+				upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 					ID:       "foo",
 					Size:     300,
 					MetaData: map[string]string{},
@@ -248,11 +247,11 @@ func TestPost(t *testing.T) {
 			upload := NewMockFullUpload(ctrl)
 
 			gomock.InOrder(
-				store.EXPECT().NewUpload(context.Background(), FileInfo{
+				store.EXPECT().NewUpload(gomock.Any(), FileInfo{
 					Size:     300,
 					MetaData: map[string]string{},
 				}).Return(upload, nil),
-				upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+				upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 					ID:       "foo",
 					Size:     300,
 					MetaData: map[string]string{},
@@ -286,11 +285,11 @@ func TestPost(t *testing.T) {
 			upload := NewMockFullUpload(ctrl)
 
 			gomock.InOrder(
-				store.EXPECT().NewUpload(context.Background(), FileInfo{
+				store.EXPECT().NewUpload(gomock.Any(), FileInfo{
 					Size:     300,
 					MetaData: map[string]string{},
 				}).Return(upload, nil),
-				upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+				upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 					ID:       "foo",
 					Size:     300,
 					MetaData: map[string]string{},
@@ -326,11 +325,11 @@ func TestPost(t *testing.T) {
 			upload := NewMockFullUpload(ctrl)
 
 			gomock.InOrder(
-				store.EXPECT().NewUpload(context.Background(), FileInfo{
+				store.EXPECT().NewUpload(gomock.Any(), FileInfo{
 					Size:     300,
 					MetaData: map[string]string{},
 				}).Return(upload, nil),
-				upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+				upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 					ID:       "foo",
 					Size:     300,
 					MetaData: map[string]string{},
@@ -363,11 +362,11 @@ func TestPost(t *testing.T) {
 			upload := NewMockFullUpload(ctrl)
 
 			gomock.InOrder(
-				store.EXPECT().NewUpload(context.Background(), FileInfo{
+				store.EXPECT().NewUpload(gomock.Any(), FileInfo{
 					Size:     300,
 					MetaData: map[string]string{},
 				}).Return(upload, nil),
-				upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+				upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 					ID:       "foo",
 					Size:     300,
 					MetaData: map[string]string{},
@@ -405,14 +404,14 @@ func TestPost(t *testing.T) {
 			upload := NewMockFullUpload(ctrl)
 
 			gomock.InOrder(
-				store.EXPECT().NewUpload(context.Background(), FileInfo{
+				store.EXPECT().NewUpload(gomock.Any(), FileInfo{
 					Size: 300,
 					MetaData: map[string]string{
 						"foo": "hello",
 						"bar": "world",
 					},
 				}).Return(upload, nil),
-				upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+				upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 					ID:   "foo",
 					Size: 300,
 					MetaData: map[string]string{
@@ -421,8 +420,8 @@ func TestPost(t *testing.T) {
 					},
 				}, nil),
 				locker.EXPECT().NewLock("foo").Return(lock, nil),
-				lock.EXPECT().Lock().Return(nil),
-				upload.EXPECT().WriteChunk(context.Background(), int64(0), NewReaderMatcher("hello")).Return(int64(5), nil),
+				lock.EXPECT().Lock(gomock.Any(), gomock.Any()).Return(nil),
+				upload.EXPECT().WriteChunk(gomock.Any(), int64(0), NewReaderMatcher("hello")).Return(int64(5), nil),
 				lock.EXPECT().Unlock().Return(nil),
 			)
 
@@ -458,11 +457,11 @@ func TestPost(t *testing.T) {
 			upload := NewMockFullUpload(ctrl)
 
 			gomock.InOrder(
-				store.EXPECT().NewUpload(context.Background(), FileInfo{
+				store.EXPECT().NewUpload(gomock.Any(), FileInfo{
 					Size:     300,
 					MetaData: map[string]string{},
 				}).Return(upload, nil),
-				upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+				upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 					ID:       "foo",
 					Size:     300,
 					MetaData: map[string]string{},
@@ -492,11 +491,11 @@ func TestPost(t *testing.T) {
 			upload := NewMockFullUpload(ctrl)
 
 			gomock.InOrder(
-				store.EXPECT().NewUpload(context.Background(), FileInfo{
+				store.EXPECT().NewUpload(gomock.Any(), FileInfo{
 					Size:     300,
 					MetaData: map[string]string{},
 				}).Return(upload, nil),
-				upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+				upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 					ID:       "foo",
 					Size:     300,
 					MetaData: map[string]string{},

pkg/handler/terminate_test.go

@@ -1,7 +1,6 @@
 package handler_test
 
 import (
-	"context"
 	"net/http"
 	"testing"
 
@@ -39,14 +38,14 @@ func TestTerminate(t *testing.T) {
 
 		gomock.InOrder(
 			locker.EXPECT().NewLock("foo").Return(lock, nil),
-			lock.EXPECT().Lock().Return(nil),
-			store.EXPECT().GetUpload(context.Background(), "foo").Return(upload, nil),
-			upload.EXPECT().GetInfo(context.Background()).Return(FileInfo{
+			lock.EXPECT().Lock(gomock.Any(), gomock.Any()).Return(nil),
+			store.EXPECT().GetUpload(gomock.Any(), "foo").Return(upload, nil),
+			upload.EXPECT().GetInfo(gomock.Any()).Return(FileInfo{
 				ID:   "foo",
 				Size: 10,
 			}, nil),
 			store.EXPECT().AsTerminatableUpload(upload).Return(upload),
-			upload.EXPECT().Terminate(context.Background()).Return(nil),
+			upload.EXPECT().Terminate(gomock.Any()).Return(nil),
 			lock.EXPECT().Unlock().Return(nil),
 		)
 

pkg/handler/unrouted_handler.go

@@ -3,7 +3,6 @@ package handler
 import (
 	"context"
 	"encoding/base64"
-	"errors"
 	"io"
 	"log"
 	"math"
@@ -24,91 +23,33 @@ var (
 	reMimeType       = regexp.MustCompile(`^[a-z]+\/[a-z0-9\-\+\.]+$`)
 )
 
-// HTTPError represents an error with an additional status code attached
-// which may be used when this error is sent in a HTTP response.
-// See the net/http package for standardized status codes.
-type HTTPError interface {
-	error
-	StatusCode() int
-	Body() []byte
-}
-
-type httpError struct {
-	error
-	statusCode int
-}
-
-func (err httpError) StatusCode() int {
-	return err.statusCode
-}
-
-func (err httpError) Body() []byte {
-	return []byte(err.Error())
-}
-
-// NewHTTPError adds the given status code to the provided error and returns
-// the new error instance. The status code may be used in corresponding HTTP
-// responses. See the net/http package for standardized status codes.
-func NewHTTPError(err error, statusCode int) HTTPError {
-	return httpError{err, statusCode}
-}
-
 var (
-	ErrUnsupportedVersion               = NewHTTPError(errors.New("unsupported version"), http.StatusPreconditionFailed)
-	ErrMaxSizeExceeded                  = NewHTTPError(errors.New("maximum size exceeded"), http.StatusRequestEntityTooLarge)
-	ErrInvalidContentType               = NewHTTPError(errors.New("missing or invalid Content-Type header"), http.StatusBadRequest)
-	ErrInvalidUploadLength              = NewHTTPError(errors.New("missing or invalid Upload-Length header"), http.StatusBadRequest)
-	ErrInvalidOffset                    = NewHTTPError(errors.New("missing or invalid Upload-Offset header"), http.StatusBadRequest)
-	ErrNotFound                         = NewHTTPError(errors.New("upload not found"), http.StatusNotFound)
-	ErrFileLocked                       = NewHTTPError(errors.New("file currently locked"), 423) // Locked (WebDAV) (RFC 4918)
-	ErrMismatchOffset                   = NewHTTPError(errors.New("mismatched offset"), http.StatusConflict)
-	ErrSizeExceeded                     = NewHTTPError(errors.New("resource's size exceeded"), http.StatusRequestEntityTooLarge)
-	ErrNotImplemented                   = NewHTTPError(errors.New("feature not implemented"), http.StatusNotImplemented)
-	ErrUploadNotFinished                = NewHTTPError(errors.New("one of the partial uploads is not finished"), http.StatusBadRequest)
-	ErrInvalidConcat                    = NewHTTPError(errors.New("invalid Upload-Concat header"), http.StatusBadRequest)
-	ErrModifyFinal                      = NewHTTPError(errors.New("modifying a final upload is not allowed"), http.StatusForbidden)
-	ErrUploadLengthAndUploadDeferLength = NewHTTPError(errors.New("provided both Upload-Length and Upload-Defer-Length"), http.StatusBadRequest)
-	ErrInvalidUploadDeferLength         = NewHTTPError(errors.New("invalid Upload-Defer-Length header"), http.StatusBadRequest)
-	ErrUploadStoppedByServer            = NewHTTPError(errors.New("upload has been stopped by server"), http.StatusBadRequest)
+	ErrUnsupportedVersion               = NewError("ERR_UNSUPPORTED_VERSION", "missing, invalid or unsupported Tus-Resumable header", http.StatusPreconditionFailed)
+	ErrMaxSizeExceeded                  = NewError("ERR_MAX_SIZE_EXCEEDED", "maximum size exceeded", http.StatusRequestEntityTooLarge)
+	ErrInvalidContentType               = NewError("ERR_INVALID_CONTENT_TYPE", "missing or invalid Content-Type header", http.StatusBadRequest)
+	ErrInvalidUploadLength              = NewError("ERR_INVALID_UPLOAD_LENGTH", "missing or invalid Upload-Length header", http.StatusBadRequest)
+	ErrInvalidOffset                    = NewError("ERR_INVALID_OFFSET", "missing or invalid Upload-Offset header", http.StatusBadRequest)
+	ErrNotFound                         = NewError("ERR_UPLOAD_NOT_FOUND", "upload not found", http.StatusNotFound)
+	ErrFileLocked                       = NewError("ERR_UPLOAD_LOCKED", "file currently locked", http.StatusLocked)
+	ErrLockTimeout                      = NewError("ERR_LOCK_TIMEOUT", "failed to acquire lock before timeout", http.StatusInternalServerError)
+	ErrMismatchOffset                   = NewError("ERR_MISMATCHED_OFFSET", "mismatched offset", http.StatusConflict)
+	ErrSizeExceeded                     = NewError("ERR_UPLOAD_SIZE_EXCEEDED", "upload's size exceeded", http.StatusRequestEntityTooLarge)
+	ErrNotImplemented                   = NewError("ERR_NOT_IMPLEMENTED", "feature not implemented", http.StatusNotImplemented)
+	ErrUploadNotFinished                = NewError("ERR_UPLOAD_NOT_FINISHED", "one of the partial uploads is not finished", http.StatusBadRequest)
+	ErrInvalidConcat                    = NewError("ERR_INVALID_CONCAT", "invalid Upload-Concat header", http.StatusBadRequest)
+	ErrModifyFinal                      = NewError("ERR_MODIFY_FINAL", "modifying a final upload is not allowed", http.StatusForbidden)
+	ErrUploadLengthAndUploadDeferLength = NewError("ERR_AMBIGUOUS_UPLOAD_LENGTH", "provided both Upload-Length and Upload-Defer-Length", http.StatusBadRequest)
+	ErrInvalidUploadDeferLength         = NewError("ERR_INVALID_UPLOAD_LENGTH_DEFER", "invalid Upload-Defer-Length header", http.StatusBadRequest)
+	ErrUploadStoppedByServer            = NewError("ERR_UPLOAD_STOPPED", "upload has been stopped by server", http.StatusBadRequest)
+	ErrUploadRejectedByServer           = NewError("ERR_UPLOAD_REJECTED", "upload creation has been rejected by server", http.StatusBadRequest)
+	ErrUploadInterrupted                = NewError("ERR_UPLAOD_INTERRUPTED", "upload has been interrupted by another request for this upload resource", http.StatusBadRequest)
 
-	errReadTimeout     = errors.New("read tcp: i/o timeout")
-	errConnectionReset = errors.New("read tcp: connection reset by peer")
+	// TODO: These two responses are 500 for backwards compatability. We should discuss
+	// whether it is better to more them to 4XX status codes.
+	ErrReadTimeout     = NewError("ERR_READ_TIMEOUT", "timeout while reading request body", http.StatusInternalServerError)
+	ErrConnectionReset = NewError("ERR_CONNECTION_RESET", "TCP connection reset by peer", http.StatusInternalServerError)
 )
 
-// HTTPRequest contains basic details of an incoming HTTP request.
-type HTTPRequest struct {
-	// Method is the HTTP method, e.g. POST or PATCH
-	Method string
-	// URI is the full HTTP request URI, e.g. /files/fooo
-	URI string
-	// RemoteAddr contains the network address that sent the request
-	RemoteAddr string
-	// Header contains all HTTP headers as present in the HTTP request.
-	Header http.Header
-}
-
-// HookEvent represents an event from tusd which can be handled by the application.
-type HookEvent struct {
-	// Upload contains information about the upload that caused this hook
-	// to be fired.
-	Upload FileInfo
-	// HTTPRequest contains details about the HTTP request that reached
-	// tusd.
-	HTTPRequest HTTPRequest
-}
-
-func newHookEvent(info FileInfo, r *http.Request) HookEvent {
-	return HookEvent{
-		Upload: info,
-		HTTPRequest: HTTPRequest{
-			Method:     r.Method,
-			URI:        r.RequestURI,
-			RemoteAddr: r.RemoteAddr,
-			Header:     r.Header,
-		},
-	}
-}
-
 // UnroutedHandler exposes methods to handle requests as part of the tus protocol,
 // such as PostFile, HeadFile, PatchFile and DelFile. In addition the GetFile method
 // is provided which is, however, not part of the specification.
@@ -264,7 +205,10 @@ func (handler *UnroutedHandler) Middleware(h http.Handler) http.Handler {
 			// will be ignored or interpreted as a rejection.
 			// For example, the Presto engine, which is used in older versions of
 			// Opera, Opera Mobile and Opera Mini, handles CORS this way.
-			handler.sendResp(w, r, http.StatusOK)
+			c := newContext(w, r)
+			handler.sendResp(c, HTTPResponse{
+				StatusCode: http.StatusOK,
+			})
 			return
 		}
 
@@ -272,7 +216,8 @@ func (handler *UnroutedHandler) Middleware(h http.Handler) http.Handler {
 		// GET and HEAD methods are not checked since a browser may visit this URL and does
 		// not include this header. GET requests are not part of the specification.
 		if r.Method != "GET" && r.Method != "HEAD" && r.Header.Get("Tus-Resumable") != "1.0.0" {
-			handler.sendError(w, r, ErrUnsupportedVersion)
+			c := newContext(w, r)
+			handler.sendError(c, ErrUnsupportedVersion)
 			return
 		}
 
@@ -284,7 +229,7 @@ func (handler *UnroutedHandler) Middleware(h http.Handler) http.Handler {
 // PostFile creates a new file upload using the datastore after validating the
 // length and parsing the metadata.
 func (handler *UnroutedHandler) PostFile(w http.ResponseWriter, r *http.Request) {
-	ctx := context.Background()
+	c := newContext(w, r)
 
 	// Check for presence of application/offset+octet-stream. If another content
 	// type is defined, it will be ignored and treated as none was set because
@@ -301,7 +246,7 @@ func (handler *UnroutedHandler) PostFile(w http.ResponseWriter, r *http.Request)
 	// Parse Upload-Concat header
 	isPartial, isFinal, partialUploadIDs, err := parseConcat(concatHeader)
 	if err != nil {
-		handler.sendError(w, r, err)
+		handler.sendError(c, err)
 		return
 	}
 
@@ -314,13 +259,13 @@ func (handler *UnroutedHandler) PostFile(w http.ResponseWriter, r *http.Request)
 	if isFinal {
 		// A final upload must not contain a chunk within the creation request
 		if containsChunk {
-			handler.sendError(w, r, ErrModifyFinal)
+			handler.sendError(c, ErrModifyFinal)
 			return
 		}
 
-		partialUploads, size, err = handler.sizeOfUploads(ctx, partialUploadIDs)
+		partialUploads, size, err = handler.sizeOfUploads(c, partialUploadIDs)
 		if err != nil {
-			handler.sendError(w, r, err)
+			handler.sendError(c, err)
 			return
 		}
 	} else {
@@ -328,14 +273,14 @@ func (handler *UnroutedHandler) PostFile(w http.ResponseWriter, r *http.Request)
 		uploadDeferLengthHeader := r.Header.Get("Upload-Defer-Length")
 		size, sizeIsDeferred, err = handler.validateNewUploadLengthHeaders(uploadLengthHeader, uploadDeferLengthHeader)
 		if err != nil {
-			handler.sendError(w, r, err)
+			handler.sendError(c, err)
 			return
 		}
 	}
 
 	// Test whether the size is still allowed
 	if handler.config.MaxSize > 0 && size > handler.config.MaxSize {
-		handler.sendError(w, r, ErrMaxSizeExceeded)
+		handler.sendError(c, ErrMaxSizeExceeded)
 		return
 	}
 
@@ -351,22 +296,29 @@ func (handler *UnroutedHandler) PostFile(w http.ResponseWriter, r *http.Request)
 		PartialUploads: partialUploadIDs,
 	}
 
-	if handler.config.PreUploadCreateCallback != nil {
-		if err := handler.config.PreUploadCreateCallback(newHookEvent(info, r)); err != nil {
-			handler.sendError(w, r, err)
-			return
-		}
+	resp := HTTPResponse{
+		StatusCode: http.StatusCreated,
+		Headers:    HTTPHeaders{},
 	}
 
-	upload, err := handler.composer.Core.NewUpload(ctx, info)
+	if handler.config.PreUploadCreateCallback != nil {
+		resp2, err := handler.config.PreUploadCreateCallback(newHookEvent(info, r))
+		if err != nil {
+			handler.sendError(c, err)
+			return
+		}
+		resp = resp.MergeWith(resp2)
+	}
+
+	upload, err := handler.composer.Core.NewUpload(c, info)
 	if err != nil {
-		handler.sendError(w, r, err)
+		handler.sendError(c, err)
 		return
 	}
 
-	info, err = upload.GetInfo(ctx)
+	info, err = upload.GetInfo(c)
 	if err != nil {
-		handler.sendError(w, r, err)
+		handler.sendError(c, err)
 		return
 	}
 
@@ -375,7 +327,7 @@ func (handler *UnroutedHandler) PostFile(w http.ResponseWriter, r *http.Request)
 	// Add the Location header directly after creating the new resource to even
 	// include it in cases of failure when an error is returned
 	url := handler.absFileURL(r, id)
-	w.Header().Set("Location", url)
+	resp.Headers["Location"] = url
 
 	handler.Metrics.incUploadsCreated()
 	handler.log("UploadCreated", "id", id, "size", i64toa(size), "url", url)
@@ -386,8 +338,8 @@ func (handler *UnroutedHandler) PostFile(w http.ResponseWriter, r *http.Request)
 
 	if isFinal {
 		concatableUpload := handler.composer.Concater.AsConcatableUpload(upload)
-		if err := concatableUpload.ConcatUploads(ctx, partialUploads); err != nil {
-			handler.sendError(w, r, err)
+		if err := concatableUpload.ConcatUploads(c, partialUploads); err != nil {
+			handler.sendError(c, err)
 			return
 		}
 		info.Offset = size
@@ -399,67 +351,74 @@ func (handler *UnroutedHandler) PostFile(w http.ResponseWriter, r *http.Request)
 
 	if containsChunk {
 		if handler.composer.UsesLocker {
-			lock, err := handler.lockUpload(id)
+			lock, err := handler.lockUpload(c, id)
 			if err != nil {
-				handler.sendError(w, r, err)
+				handler.sendError(c, err)
 				return
 			}
 
 			defer lock.Unlock()
 		}
 
-		if err := handler.writeChunk(ctx, upload, info, w, r); err != nil {
-			handler.sendError(w, r, err)
+		resp, err = handler.writeChunk(c, resp, upload, info)
+		if err != nil {
+			handler.sendError(c, err)
 			return
 		}
 	} else if !sizeIsDeferred && size == 0 {
 		// Directly finish the upload if the upload is empty (i.e. has a size of 0).
 		// This statement is in an else-if block to avoid causing duplicate calls
 		// to finishUploadIfComplete if an upload is empty and contains a chunk.
-		if err := handler.finishUploadIfComplete(ctx, upload, info, r); err != nil {
-			handler.sendError(w, r, err)
+		resp, err = handler.finishUploadIfComplete(c, resp, upload, info)
+		if err != nil {
+			handler.sendError(c, err)
 			return
 		}
 	}
 
-	handler.sendResp(w, r, http.StatusCreated)
+	handler.sendResp(c, resp)
 }
 
 // HeadFile returns the length and offset for the HEAD request
 func (handler *UnroutedHandler) HeadFile(w http.ResponseWriter, r *http.Request) {
-	ctx := context.Background()
+	c := newContext(w, r)
 
 	id, err := extractIDFromPath(r.URL.Path)
 	if err != nil {
-		handler.sendError(w, r, err)
+		handler.sendError(c, err)
 		return
 	}
 
 	if handler.composer.UsesLocker {
-		lock, err := handler.lockUpload(id)
+		lock, err := handler.lockUpload(c, id)
 		if err != nil {
-			handler.sendError(w, r, err)
+			handler.sendError(c, err)
 			return
 		}
 
 		defer lock.Unlock()
 	}
 
-	upload, err := handler.composer.Core.GetUpload(ctx, id)
+	upload, err := handler.composer.Core.GetUpload(c, id)
 	if err != nil {
-		handler.sendError(w, r, err)
+		handler.sendError(c, err)
 		return
 	}
 
-	info, err := upload.GetInfo(ctx)
+	info, err := upload.GetInfo(c)
 	if err != nil {
-		handler.sendError(w, r, err)
+		handler.sendError(c, err)
 		return
 	}
 
+	resp := HTTPResponse{
+		StatusCode: http.StatusOK,
+		Headers:    make(HTTPHeaders),
+	}
+
 	// Add Upload-Concat header if possible
 	if info.IsPartial {
-		w.Header().Set("Upload-Concat", "partial")
+		resp.Headers["Upload-Concat"] = "partial"
 	}
 
 	if info.IsFinal {
@@ -470,107 +429,112 @@ func (handler *UnroutedHandler) HeadFile(w http.ResponseWriter, r *http.Request)
 		// Remove trailing space
 		v = v[:len(v)-1]
 
-		w.Header().Set("Upload-Concat", v)
+		resp.Headers["Upload-Concat"] = v
 	}
 
 	if len(info.MetaData) != 0 {
-		w.Header().Set("Upload-Metadata", SerializeMetadataHeader(info.MetaData))
+		resp.Headers["Upload-Metadata"] = SerializeMetadataHeader(info.MetaData)
 	}
 
 	if info.SizeIsDeferred {
-		w.Header().Set("Upload-Defer-Length", UploadLengthDeferred)
+		resp.Headers["Upload-Defer-Length"] = UploadLengthDeferred
 	} else {
-		w.Header().Set("Upload-Length", strconv.FormatInt(info.Size, 10))
-		w.Header().Set("Content-Length", strconv.FormatInt(info.Size, 10))
+		resp.Headers["Upload-Length"] = strconv.FormatInt(info.Size, 10)
+		resp.Headers["Content-Length"] = strconv.FormatInt(info.Size, 10)
 	}
 
-	w.Header().Set("Cache-Control", "no-store")
-	w.Header().Set("Upload-Offset", strconv.FormatInt(info.Offset, 10))
-	handler.sendResp(w, r, http.StatusOK)
+	resp.Headers["Cache-Control"] = "no-store"
+	resp.Headers["Upload-Offset"] = strconv.FormatInt(info.Offset, 10)
+	handler.sendResp(c, resp)
 }
 
 // PatchFile adds a chunk to an upload. This operation is only allowed
 // if enough space in the upload is left.
 func (handler *UnroutedHandler) PatchFile(w http.ResponseWriter, r *http.Request) {
-	ctx := context.Background()
+	c := newContext(w, r)
 
 	// Check for presence of application/offset+octet-stream
 	if r.Header.Get("Content-Type") != "application/offset+octet-stream" {
-		handler.sendError(w, r, ErrInvalidContentType)
+		handler.sendError(c, ErrInvalidContentType)
 		return
 	}
 
 	// Check for presence of a valid Upload-Offset Header
 	offset, err := strconv.ParseInt(r.Header.Get("Upload-Offset"), 10, 64)
 	if err != nil || offset < 0 {
-		handler.sendError(w, r, ErrInvalidOffset)
+		handler.sendError(c, ErrInvalidOffset)
 		return
 	}
 
 	id, err := extractIDFromPath(r.URL.Path)
 	if err != nil {
-		handler.sendError(w, r, err)
+		handler.sendError(c, err)
 		return
 	}
 
 	if handler.composer.UsesLocker {
-		lock, err := handler.lockUpload(id)
+		lock, err := handler.lockUpload(c, id)
 		if err != nil {
-			handler.sendError(w, r, err)
+			handler.sendError(c, err)
 			return
 		}
 
 		defer lock.Unlock()
 	}
 
-	upload, err := handler.composer.Core.GetUpload(ctx, id)
+	upload, err := handler.composer.Core.GetUpload(c, id)
 	if err != nil {
-		handler.sendError(w, r, err)
+		handler.sendError(c, err)
 		return
 	}
 
-	info, err := upload.GetInfo(ctx)
+	info, err := upload.GetInfo(c)
 	if err != nil {
-		handler.sendError(w, r, err)
+		handler.sendError(c, err)
 		return
 	}
 
 	// Modifying a final upload is not allowed
 	if info.IsFinal {
-		handler.sendError(w, r, ErrModifyFinal)
+		handler.sendError(c, ErrModifyFinal)
 		return
 	}
 
 	if offset != info.Offset {
-		handler.sendError(w, r, ErrMismatchOffset)
+		handler.sendError(c, ErrMismatchOffset)
 		return
 	}
 
+	resp := HTTPResponse{
+		StatusCode: http.StatusNoContent,
+		Headers:    make(HTTPHeaders, 1), // Initialize map, so writeChunk can set the Upload-Offset header.
+	}
+
 	// Do not proxy the call to the data store if the upload is already completed
 	if !info.SizeIsDeferred && info.Offset == info.Size {
-		w.Header().Set("Upload-Offset", strconv.FormatInt(offset, 10))
-		handler.sendResp(w, r, http.StatusNoContent)
+		resp.Headers["Upload-Offset"] = strconv.FormatInt(offset, 10)
+		handler.sendResp(c, resp)
 		return
 	}
 
 	if r.Header.Get("Upload-Length") != "" {
 		if !handler.composer.UsesLengthDeferrer {
-			handler.sendError(w, r, ErrNotImplemented)
+			handler.sendError(c, ErrNotImplemented)
 			return
 		}
 		if !info.SizeIsDeferred {
-			handler.sendError(w, r, ErrInvalidUploadLength)
+			handler.sendError(c, ErrInvalidUploadLength)
 			return
 		}
 		uploadLength, err := strconv.ParseInt(r.Header.Get("Upload-Length"), 10, 64)
 		if err != nil || uploadLength < 0 || uploadLength < info.Offset || (handler.config.MaxSize > 0 && uploadLength > handler.config.MaxSize) {
-			handler.sendError(w, r, ErrInvalidUploadLength)
+			handler.sendError(c, ErrInvalidUploadLength)
 			return
 		}
 
 		lengthDeclarableUpload := handler.composer.LengthDeferrer.AsLengthDeclarableUpload(upload)
-		if err := lengthDeclarableUpload.DeclareLength(ctx, uploadLength); err != nil {
-			handler.sendError(w, r, err)
+		if err := lengthDeclarableUpload.DeclareLength(c, uploadLength); err != nil {
+			handler.sendError(c, err)
 			return
 		}
 
@@ -578,26 +542,28 @@ func (handler *UnroutedHandler) PatchFile(w http.ResponseWriter, r *http.Request
 		info.SizeIsDeferred = false
 	}
 
-	if err := handler.writeChunk(ctx, upload, info, w, r); err != nil {
-		handler.sendError(w, r, err)
+	resp, err = handler.writeChunk(c, resp, upload, info)
+	if err != nil {
+		handler.sendError(c, err)
 		return
 	}
 
-	handler.sendResp(w, r, http.StatusNoContent)
+	handler.sendResp(c, resp)
 }
 
 // writeChunk reads the body from the requests r and appends it to the upload
 // with the corresponding id. Afterwards, it will set the necessary response
 // headers but will not send the response.
-func (handler *UnroutedHandler) writeChunk(ctx context.Context, upload Upload, info FileInfo, w http.ResponseWriter, r *http.Request) error {
+func (handler *UnroutedHandler) writeChunk(c *httpContext, resp HTTPResponse, upload Upload, info FileInfo) (HTTPResponse, error) {
 	// Get Content-Length if possible
+	r := c.req
 	length := r.ContentLength
 	offset := info.Offset
 	id := info.ID
 
 	// Test if this upload fits into the file's size
 	if !info.SizeIsDeferred && offset+length > info.Size {
-		return ErrSizeExceeded
+		return resp, ErrSizeExceeded
 	}
 
 	maxSize := info.Size - offset
@@ -625,7 +591,7 @@ func (handler *UnroutedHandler) writeChunk(ctx context.Context, upload Upload, i
 	// available in the case of a malicious request.
 	if r.Body != nil {
 		// Limit the data read from the request's body to the allowed maximum
-		reader := newBodyReader(io.LimitReader(r.Body, maxSize))
+		c.body = newBodyReader(r.Body, maxSize)
 
 		// We use a context object to allow the hook system to cancel an upload
 		uploadCtx, stopUpload := context.WithCancel(context.Background())
@@ -640,18 +606,19 @@ func (handler *UnroutedHandler) writeChunk(ctx context.Context, upload Upload, i
 		go func() {
 			// Interrupt the Read() call from the request body
 			<-uploadCtx.Done()
+			// TODO: Consider using CloseWithError function from BodyReader
 			terminateUpload = true
 			r.Body.Close()
 		}()
 
 		if handler.config.NotifyUploadProgress {
-			stopProgressEvents := handler.sendProgressMessages(newHookEvent(info, r), reader)
+			stopProgressEvents := handler.sendProgressMessages(newHookEvent(info, r), c.body)
 			defer close(stopProgressEvents)
 		}
 
-		bytesWritten, err = upload.WriteChunk(ctx, offset, reader)
+		bytesWritten, err = upload.WriteChunk(c, offset, c.body)
 		if terminateUpload && handler.composer.UsesTerminater {
-			if terminateErr := handler.terminateUpload(ctx, upload, info, r); terminateErr != nil {
+			if terminateErr := handler.terminateUpload(c, upload, info); terminateErr != nil {
 				// We only log this error and not show it to the user since this
 				// termination error is not relevant to the uploading client
 				handler.log("UploadStopTerminateError", "id", id, "error", terminateErr.Error())
@@ -660,7 +627,7 @@ func (handler *UnroutedHandler) writeChunk(ctx context.Context, upload Upload, i
 
 		// If we encountered an error while reading the body from the HTTP request, log it, but only include
 		// it in the response, if the store did not also return an error.
-		if bodyErr := reader.hasError(); bodyErr != nil {
+		if bodyErr := c.body.hasError(); bodyErr != nil {
 			handler.log("BodyReadError", "id", id, "error", bodyErr.Error())
 			if err == nil {
 				err = bodyErr
@@ -677,34 +644,38 @@ func (handler *UnroutedHandler) writeChunk(ctx context.Context, upload Upload, i
 	handler.log("ChunkWriteComplete", "id", id, "bytesWritten", i64toa(bytesWritten))
 
 	if err != nil {
-		return err
+		return resp, err
 	}
 
 	// Send new offset to client
 	newOffset := offset + bytesWritten
-	w.Header().Set("Upload-Offset", strconv.FormatInt(newOffset, 10))
+	resp.Headers["Upload-Offset"] = strconv.FormatInt(newOffset, 10)
 	handler.Metrics.incBytesReceived(uint64(bytesWritten))
 	info.Offset = newOffset
 
-	return handler.finishUploadIfComplete(ctx, upload, info, r)
+	return handler.finishUploadIfComplete(c, resp, upload, info)
 }
 
 // finishUploadIfComplete checks whether an upload is completed (i.e. upload offset
 // matches upload size) and if so, it will call the data store's FinishUpload
 // function and send the necessary message on the CompleteUpload channel.
-func (handler *UnroutedHandler) finishUploadIfComplete(ctx context.Context, upload Upload, info FileInfo, r *http.Request) error {
+func (handler *UnroutedHandler) finishUploadIfComplete(c *httpContext, resp HTTPResponse, upload Upload, info FileInfo) (HTTPResponse, error) {
+	r := c.req
+
 	// If the upload is completed, ...
 	if !info.SizeIsDeferred && info.Offset == info.Size {
 		// ... allow the data storage to finish and cleanup the upload
-		if err := upload.FinishUpload(ctx); err != nil {
-			return err
+		if err := upload.FinishUpload(c); err != nil {
+			return resp, err
 		}
 
 		// ... allow the hook callback to run before sending the response
 		if handler.config.PreFinishResponseCallback != nil {
-			if err := handler.config.PreFinishResponseCallback(newHookEvent(info, r)); err != nil {
-				return err
+			resp2, err := handler.config.PreFinishResponseCallback(newHookEvent(info, r))
+			if err != nil {
+				return resp, err
 			}
+			resp = resp.MergeWith(resp2)
 		}
 
 		handler.Metrics.incUploadsFinished()
@@ -715,68 +686,70 @@ func (handler *UnroutedHandler) finishUploadIfComplete(ctx context.Context, uplo
 		}
 	}
 
-	return nil
+	return resp, nil
 }
 
 // GetFile handles requests to download a file using a GET request. This is not
 // part of the specification.
 func (handler *UnroutedHandler) GetFile(w http.ResponseWriter, r *http.Request) {
-	ctx := context.Background()
+	c := newContext(w, r)
 
 	id, err := extractIDFromPath(r.URL.Path)
 	if err != nil {
-		handler.sendError(w, r, err)
+		handler.sendError(c, err)
 		return
 	}
 
 	if handler.composer.UsesLocker {
-		lock, err := handler.lockUpload(id)
+		lock, err := handler.lockUpload(c, id)
 		if err != nil {
-			handler.sendError(w, r, err)
+			handler.sendError(c, err)
 			return
 		}
 
 		defer lock.Unlock()
 	}
 
-	upload, err := handler.composer.Core.GetUpload(ctx, id)
+	upload, err := handler.composer.Core.GetUpload(c, id)
 	if err != nil {
-		handler.sendError(w, r, err)
+		handler.sendError(c, err)
 		return
 	}
 
-	info, err := upload.GetInfo(ctx)
+	info, err := upload.GetInfo(c)
 	if err != nil {
-		handler.sendError(w, r, err)
+		handler.sendError(c, err)
 		return
 	}
 
-	// Set headers before sending responses
-	w.Header().Set("Content-Length", strconv.FormatInt(info.Offset, 10))
-
 	contentType, contentDisposition := filterContentType(info)
-	w.Header().Set("Content-Type", contentType)
-	w.Header().Set("Content-Disposition", contentDisposition)
+	resp := HTTPResponse{
+		StatusCode: http.StatusOK,
+		Headers: HTTPHeaders{
+			"Content-Length":      strconv.FormatInt(info.Offset, 10),
+			"Content-Type":        contentType,
+			"Content-Disposition": contentDisposition,
+		},
+		Body: "", // Body is intentionally left empty, and we copy it manually in later.
+	}
 
 	// If no data has been uploaded yet, respond with an empty "204 No Content" status.
 	if info.Offset == 0 {
-		handler.sendResp(w, r, http.StatusNoContent)
+		resp.StatusCode = http.StatusNoContent
+		handler.sendResp(c, resp)
 		return
 	}
 
-	src, err := upload.GetReader(ctx)
+	src, err := upload.GetReader(c)
 	if err != nil {
-		handler.sendError(w, r, err)
+		handler.sendError(c, err)
 		return
 	}
 
-	handler.sendResp(w, r, http.StatusOK)
+	handler.sendResp(c, resp)
 	io.Copy(w, src)
 
-	// Try to close the reader if the io.Closer interface is implemented
-	if closer, ok := src.(io.Closer); ok {
-		closer.Close()
-	}
+	src.Close()
 }
 
 // mimeInlineBrowserWhitelist is a map containing MIME types which should be
@@ -842,52 +815,54 @@ func filterContentType(info FileInfo) (contentType string, contentDisposition st
 
 // DelFile terminates an upload permanently.
 func (handler *UnroutedHandler) DelFile(w http.ResponseWriter, r *http.Request) {
-	ctx := context.Background()
+	c := newContext(w, r)
 
 	// Abort the request handling if the required interface is not implemented
 	if !handler.composer.UsesTerminater {
-		handler.sendError(w, r, ErrNotImplemented)
+		handler.sendError(c, ErrNotImplemented)
 		return
 	}
 
 	id, err := extractIDFromPath(r.URL.Path)
 	if err != nil {
-		handler.sendError(w, r, err)
+		handler.sendError(c, err)
 		return
 	}
 
 	if handler.composer.UsesLocker {
-		lock, err := handler.lockUpload(id)
+		lock, err := handler.lockUpload(c, id)
 		if err != nil {
-			handler.sendError(w, r, err)
+			handler.sendError(c, err)
 			return
 		}
 
 		defer lock.Unlock()
 	}
 
-	upload, err := handler.composer.Core.GetUpload(ctx, id)
+	upload, err := handler.composer.Core.GetUpload(c, id)
 	if err != nil {
-		handler.sendError(w, r, err)
+		handler.sendError(c, err)
 		return
 	}
 
 	var info FileInfo
 	if handler.config.NotifyTerminatedUploads {
-		info, err = upload.GetInfo(ctx)
+		info, err = upload.GetInfo(c)
 		if err != nil {
-			handler.sendError(w, r, err)
+			handler.sendError(c, err)
 			return
 		}
 	}
 
-	err = handler.terminateUpload(ctx, upload, info, r)
+	err = handler.terminateUpload(c, upload, info)
 	if err != nil {
-		handler.sendError(w, r, err)
+		handler.sendError(c, err)
 		return
 	}
 
-	handler.sendResp(w, r, http.StatusNoContent)
+	handler.sendResp(c, HTTPResponse{
+		StatusCode: http.StatusNoContent,
+	})
 }
 
 // terminateUpload passes a given upload to the DataStore's Terminater,
@@ -895,16 +870,16 @@ func (handler *UnroutedHandler) DelFile(w http.ResponseWriter, r *http.Request)
 // and updates the statistics.
 // Note the the info argument is only needed if the terminated uploads
 // notifications are enabled.
-func (handler *UnroutedHandler) terminateUpload(ctx context.Context, upload Upload, info FileInfo, r *http.Request) error {
+func (handler *UnroutedHandler) terminateUpload(c *httpContext, upload Upload, info FileInfo) error {
 	terminatableUpload := handler.composer.Terminater.AsTerminatableUpload(upload)
 
-	err := terminatableUpload.Terminate(ctx)
+	err := terminatableUpload.Terminate(c)
 	if err != nil {
 		return err
 	}
 
 	if handler.config.NotifyTerminatedUploads {
-		handler.TerminatedUploads <- newHookEvent(info, r)
+		handler.TerminatedUploads <- newHookEvent(info, c.req)
 	}
 
 	handler.Metrics.incUploadsTerminated()
@@ -914,20 +889,20 @@ func (handler *UnroutedHandler) terminateUpload(ctx context.Context, upload Uplo
 
 // Send the error in the response body. The status code will be looked up in
 // ErrStatusCodes. If none is found 500 Internal Error will be used.
-func (handler *UnroutedHandler) sendError(w http.ResponseWriter, r *http.Request, err error) {
+func (handler *UnroutedHandler) sendError(c *httpContext, err error) {
 	// Errors for read timeouts contain too much information which is not
 	// necessary for us and makes grouping for the metrics harder. The error
 	// message looks like: read tcp 127.0.0.1:1080->127.0.0.1:53673: i/o timeout
 	// Therefore, we use a common error message for all of them.
 	if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
-		err = errReadTimeout
+		err = ErrReadTimeout
 	}
 
 	// Errors for connnection resets also contain TCP details, we don't need, e.g:
 	// read tcp 127.0.0.1:1080->127.0.0.1:10023: read: connection reset by peer
 	// Therefore, we also trim those down.
 	if strings.HasSuffix(err.Error(), "read: connection reset by peer") {
-		err = errConnectionReset
+		err = ErrConnectionReset
 	}
 
 	// TODO: Decide if we should handle this in here, in body_reader or not at all.
@@ -949,31 +924,29 @@ func (handler *UnroutedHandler) sendError(w http.ResponseWriter, r *http.Request
 	//	err = nil
 	//}
 
-	statusErr, ok := err.(HTTPError)
+	r := c.req
+
+	detailedErr, ok := err.(Error)
 	if !ok {
-		statusErr = NewHTTPError(err, http.StatusInternalServerError)
+		handler.log("InternalServerError", "message", err.Error(), "method", r.Method, "path", r.URL.Path, "requestId", getRequestId(r))
+		detailedErr = NewError("ERR_INTERNAL_SERVER_ERROR", err.Error(), http.StatusInternalServerError)
 	}
 
-	reason := append(statusErr.Body(), '\n')
+	// If we are sending the response for a HEAD request, ensure that we are not including
+	// any response body.
 	if r.Method == "HEAD" {
-		reason = nil
+		detailedErr.HTTPResponse.Body = ""
 	}
 
-	w.Header().Set("Content-Type", "text/plain; charset=utf-8")
-	w.Header().Set("Content-Length", strconv.Itoa(len(reason)))
-	w.WriteHeader(statusErr.StatusCode())
-	w.Write(reason)
-
-	handler.log("ResponseOutgoing", "status", strconv.Itoa(statusErr.StatusCode()), "method", r.Method, "path", r.URL.Path, "error", err.Error(), "requestId", getRequestId(r))
-
-	handler.Metrics.incErrorsTotal(statusErr)
+	handler.sendResp(c, detailedErr.HTTPResponse)
+	handler.Metrics.incErrorsTotal(detailedErr)
 }
 
 // sendResp writes the header to w with the specified status code.
-func (handler *UnroutedHandler) sendResp(w http.ResponseWriter, r *http.Request, status int) {
-	w.WriteHeader(status)
+func (handler *UnroutedHandler) sendResp(c *httpContext, resp HTTPResponse) {
+	resp.writeTo(c.res)
 
-	handler.log("ResponseOutgoing", "status", strconv.Itoa(status), "method", r.Method, "path", r.URL.Path, "requestId", getRequestId(r))
+	handler.log("ResponseOutgoing", "status", strconv.Itoa(resp.StatusCode), "method", c.req.Method, "path", c.req.URL.Path, "requestId", getRequestId(c.req), "body", resp.Body)
 }
 
 // Make an absolute URLs to the given upload id. If the base path is absolute
@@ -1010,7 +983,7 @@ func (handler *UnroutedHandler) sendProgressMessages(hook HookEvent, reader *bod
 					previousOffset = hook.Upload.Offset
 				}
 				return
-			case <-time.After(1 * time.Second):
+			case <-time.After(handler.config.UploadProgressInterval):
 				hook.Upload.Offset = originalOffset + reader.bytesRead()
 				if hook.Upload.Offset != previousOffset {
 					handler.UploadProgress <- hook
@@ -1117,13 +1090,23 @@ func (handler *UnroutedHandler) validateNewUploadLengthHeaders(uploadLengthHeade
 
 // lockUpload creates a new lock for the given upload ID and attempts to lock it.
 // The created lock is returned if it was aquired successfully.
-func (handler *UnroutedHandler) lockUpload(id string) (Lock, error) {
+func (handler *UnroutedHandler) lockUpload(c *httpContext, id string) (Lock, error) {
 	lock, err := handler.composer.Locker.NewLock(id)
 	if err != nil {
 		return nil, err
 	}
 
-	if err := lock.Lock(); err != nil {
+	// TODO: Make lock timeout configurable
+	ctx, cancelContext := context.WithTimeout(context.Background(), 3*time.Second)
+	defer cancelContext()
+	releaseLock := func() {
+		if c.body != nil {
+			handler.log("UploadInterrupted", "id", id, "requestId", getRequestId(c.req))
+			c.body.closeWithError(ErrUploadInterrupted)
+		}
+	}
+
+	if err := lock.Lock(ctx, releaseLock); err != nil {
 		return nil, err
 	}
 

pkg/handler/utils_test.go

@@ -13,7 +13,7 @@ import (
 	"github.com/tus/tusd/pkg/handler"
 )
 
-//go:generate mockgen -package handler_test -source utils_test.go -aux_files handler=datastore.go -destination=handler_mock_test.go
+//go:generate mockgen -package handler_test -source utils_test.go -destination=handler_mock_test.go
 
 // FullDataStore is an interface combining most interfaces for data stores.
 // This is used by mockgen(1) to generate a mocked data store used for testing

pkg/memorylocker/memorylocker.go

@@ -1,5 +1,6 @@
 // Package memorylocker provides an in-memory locking mechanism.
 //
+// TODO: Update comment
 // When multiple processes are attempting to access an upload, whether it be
 // by reading or writing, a synchronization mechanism is required to prevent
 // data corruption, especially to ensure correct offset values and the proper
@@ -11,6 +12,7 @@
 package memorylocker
 
 import (
+	"context"
 	"sync"
 
 	"github.com/tus/tusd/pkg/handler"
@@ -20,14 +22,19 @@ import (
 // cheap mechanism. Locks will only exist as long as this object is kept in
 // reference and will be erased if the program exits.
 type MemoryLocker struct {
-	locks map[string]struct{}
-	mutex sync.Mutex
+	locks map[string]lockEntry
+	mutex sync.RWMutex
+}
+
+type lockEntry struct {
+	lockReleased   chan struct{}
+	requestRelease func()
 }
 
 // New creates a new in-memory locker.
 func New() *MemoryLocker {
 	return &MemoryLocker{
-		locks: make(map[string]struct{}),
+		locks: make(map[string]lockEntry),
 	}
 }
 
@@ -46,16 +53,40 @@ type memoryLock struct {
 }
 
 // Lock tries to obtain the exclusive lock.
-func (lock memoryLock) Lock() error {
-	lock.locker.mutex.Lock()
-	defer lock.locker.mutex.Unlock()
+func (lock memoryLock) Lock(ctx context.Context, requestRelease func()) error {
+	lock.locker.mutex.RLock()
+	entry, ok := lock.locker.locks[lock.id]
+	lock.locker.mutex.RUnlock()
 
-	// Ensure file is not locked
-	if _, ok := lock.locker.locks[lock.id]; ok {
-		return handler.ErrFileLocked
+requestRelease:
+	if ok {
+		// TODO: Make this channel?
+		// TODO: Should we ensure this is only called once?
+		entry.requestRelease()
+		select {
+		case <-ctx.Done():
+			return handler.ErrLockTimeout
+		case <-entry.lockReleased:
+		}
 	}
 
-	lock.locker.locks[lock.id] = struct{}{}
+	lock.locker.mutex.Lock()
+	// Check that the lock has not already been created in the meantime
+	entry, ok = lock.locker.locks[lock.id]
+	if ok {
+		// Lock has been created in the meantime, so we must wait again until it is free
+		lock.locker.mutex.Unlock()
+		goto requestRelease
+	}
+
+	// No lock exists, so we can create it
+	entry = lockEntry{
+		lockReleased:   make(chan struct{}),
+		requestRelease: requestRelease,
+	}
+
+	lock.locker.locks[lock.id] = entry
+	lock.locker.mutex.Unlock()
 
 	return nil
 }
@@ -64,10 +95,14 @@ func (lock memoryLock) Lock() error {
 func (lock memoryLock) Unlock() error {
 	lock.locker.mutex.Lock()
 
-	// Deleting a non-existing key does not end in unexpected errors or panic
-	// since this operation results in a no-op
+	lockReleased := lock.locker.locks[lock.id].lockReleased
+
+	// Delete the lock entry entirely
 	delete(lock.locker.locks, lock.id)
 
 	lock.locker.mutex.Unlock()
+
+	close(lockReleased)
+
 	return nil
 }

pkg/memorylocker/memorylocker_test.go

@@ -1,16 +1,17 @@
 package memorylocker
 
 import (
+	"context"
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/assert"
-
 	"github.com/tus/tusd/pkg/handler"
 )
 
 var _ handler.Locker = &MemoryLocker{}
 
-func TestMemoryLocker(t *testing.T) {
+func TestMemoryLocker_LockAndUnlock(t *testing.T) {
 	a := assert.New(t)
 
 	locker := New()
@@ -18,13 +19,62 @@ func TestMemoryLocker(t *testing.T) {
 	lock1, err := locker.NewLock("one")
 	a.NoError(err)
 
-	a.NoError(lock1.Lock())
-	a.Equal(handler.ErrFileLocked, lock1.Lock())
+	a.NoError(lock1.Lock(context.Background(), func() {
+		panic("must not be called")
+	}))
+	a.NoError(lock1.Unlock())
+}
+
+func TestMemoryLocker_Timeout(t *testing.T) {
+	a := assert.New(t)
+
+	locker := New()
+	releaseRequestCalled := false
+
+	lock1, err := locker.NewLock("one")
+	a.NoError(err)
+	a.NoError(lock1.Lock(context.Background(), func() {
+		releaseRequestCalled = true
+		// We note that the function has been called, but do not
+		// release the lock
+	}))
+
+	ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond)
+	defer cancel()
 
 	lock2, err := locker.NewLock("one")
 	a.NoError(err)
-	a.Equal(handler.ErrFileLocked, lock2.Lock())
+	err = lock2.Lock(ctx, func() {
+		panic("must not be called")
+	})
 
-	a.NoError(lock1.Unlock())
-	a.NoError(lock1.Unlock())
+	a.Equal(err, handler.ErrLockTimeout)
+	a.True(releaseRequestCalled)
+}
+
+func TestMemoryLocker_RequestUnlock(t *testing.T) {
+	a := assert.New(t)
+
+	locker := New()
+	releaseRequestCalled := false
+
+	lock1, err := locker.NewLock("one")
+	a.NoError(err)
+	a.NoError(lock1.Lock(context.Background(), func() {
+		releaseRequestCalled = true
+		<-time.After(10 * time.Millisecond)
+		a.NoError(lock1.Unlock())
+	}))
+
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
+	defer cancel()
+
+	lock2, err := locker.NewLock("one")
+	a.NoError(err)
+	a.NoError(lock2.Lock(ctx, func() {
+		panic("must not be called")
+	}))
+	a.NoError(lock2.Unlock())
+
+	a.True(releaseRequestCalled)
 }

pkg/prometheuscollector/prometheuscollector.go

@@ -25,7 +25,7 @@ var (
 	errorsTotalDesc = prometheus.NewDesc(
 		"tusd_errors_total",
 		"Total number of errors per status.",
-		[]string{"status", "message"}, nil)
+		[]string{"status", "code"}, nil)
 	bytesReceivedDesc = prometheus.NewDesc(
 		"tusd_bytes_received",
 		"Number of bytes received for uploads.",
@@ -79,8 +79,8 @@ func (c Collector) Collect(metrics chan<- prometheus.Metric) {
 			errorsTotalDesc,
 			prometheus.CounterValue,
 			float64(atomic.LoadUint64(valuePtr)),
-			strconv.Itoa(httpError.StatusCode()),
-			httpError.Error(),
+			strconv.Itoa(httpError.StatusCode),
+			httpError.ErrorCode,
 		)
 	}
 

pkg/proto/v1/hook.pb.go

@@ -1,475 +0,0 @@
-// Code generated by protoc-gen-go. DO NOT EDIT.
-// source: v1/hook.proto
-
-package v1
-
-import (
-	context "context"
-	fmt "fmt"
-	proto "github.com/golang/protobuf/proto"
-	any "github.com/golang/protobuf/ptypes/any"
-	grpc "google.golang.org/grpc"
-	codes "google.golang.org/grpc/codes"
-	status "google.golang.org/grpc/status"
-	math "math"
-)
-
-// Reference imports to suppress errors if they are not otherwise used.
-var _ = proto.Marshal
-var _ = fmt.Errorf
-var _ = math.Inf
-
-// This is a compile-time assertion to ensure that this generated file
-// is compatible with the proto package it is being compiled against.
-// A compilation error at this line likely means your copy of the
-// proto package needs to be updated.
-const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
-
-// Uploaded data
-type Upload struct {
-	// Unique integer identifier of the uploaded file
-	Id string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
-	// Total file size in bytes specified in the NewUpload call
-	Size int64 `protobuf:"varint,2,opt,name=Size,proto3" json:"Size,omitempty"`
-	// Indicates whether the total file size is deferred until later
-	SizeIsDeferred bool `protobuf:"varint,3,opt,name=SizeIsDeferred,proto3" json:"SizeIsDeferred,omitempty"`
-	// Offset in bytes (zero-based)
-	Offset   int64             `protobuf:"varint,4,opt,name=Offset,proto3" json:"Offset,omitempty"`
-	MetaData map[string]string `protobuf:"bytes,5,rep,name=metaData,proto3" json:"metaData,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	// Indicates that this is a partial upload which will later be used to form
-	// a final upload by concatenation. Partial uploads should not be processed
-	// when they are finished since they are only incomplete chunks of files.
-	IsPartial bool `protobuf:"varint,6,opt,name=isPartial,proto3" json:"isPartial,omitempty"`
-	// Indicates that this is a final upload
-	IsFinal bool `protobuf:"varint,7,opt,name=isFinal,proto3" json:"isFinal,omitempty"`
-	// If the upload is a final one (see IsFinal) this will be a non-empty
-	// ordered slice containing the ids of the uploads of which the final upload
-	// will consist after concatenation.
-	PartialUploads []string `protobuf:"bytes,8,rep,name=partialUploads,proto3" json:"partialUploads,omitempty"`
-	// Storage contains information about where the data storage saves the upload,
-	// for example a file path. The available values vary depending on what data
-	// store is used. This map may also be nil.
-	Storage              map[string]string `protobuf:"bytes,9,rep,name=storage,proto3" json:"storage,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
-	XXX_unrecognized     []byte            `json:"-"`
-	XXX_sizecache        int32             `json:"-"`
-}
-
-func (m *Upload) Reset()         { *m = Upload{} }
-func (m *Upload) String() string { return proto.CompactTextString(m) }
-func (*Upload) ProtoMessage()    {}
-func (*Upload) Descriptor() ([]byte, []int) {
-	return fileDescriptor_581082325ef044c1, []int{0}
-}
-
-func (m *Upload) XXX_Unmarshal(b []byte) error {
-	return xxx_messageInfo_Upload.Unmarshal(m, b)
-}
-func (m *Upload) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
-	return xxx_messageInfo_Upload.Marshal(b, m, deterministic)
-}
-func (m *Upload) XXX_Merge(src proto.Message) {
-	xxx_messageInfo_Upload.Merge(m, src)
-}
-func (m *Upload) XXX_Size() int {
-	return xxx_messageInfo_Upload.Size(m)
-}
-func (m *Upload) XXX_DiscardUnknown() {
-	xxx_messageInfo_Upload.DiscardUnknown(m)
-}
-
-var xxx_messageInfo_Upload proto.InternalMessageInfo
-
-func (m *Upload) GetId() string {
-	if m != nil {
-		return m.Id
-	}
-	return ""
-}
-
-func (m *Upload) GetSize() int64 {
-	if m != nil {
-		return m.Size
-	}
-	return 0
-}
-
-func (m *Upload) GetSizeIsDeferred() bool {
-	if m != nil {
-		return m.SizeIsDeferred
-	}
-	return false
-}
-
-func (m *Upload) GetOffset() int64 {
-	if m != nil {
-		return m.Offset
-	}
-	return 0
-}
-
-func (m *Upload) GetMetaData() map[string]string {
-	if m != nil {
-		return m.MetaData
-	}
-	return nil
-}
-
-func (m *Upload) GetIsPartial() bool {
-	if m != nil {
-		return m.IsPartial
-	}
-	return false
-}
-
-func (m *Upload) GetIsFinal() bool {
-	if m != nil {
-		return m.IsFinal
-	}
-	return false
-}
-
-func (m *Upload) GetPartialUploads() []string {
-	if m != nil {
-		return m.PartialUploads
-	}
-	return nil
-}
-
-func (m *Upload) GetStorage() map[string]string {
-	if m != nil {
-		return m.Storage
-	}
-	return nil
-}
-
-type HTTPRequest struct {
-	// Method is the HTTP method, e.g. POST or PATCH
-	Method string `protobuf:"bytes,1,opt,name=method,proto3" json:"method,omitempty"`
-	// URI is the full HTTP request URI, e.g. /files/fooo
-	Uri string `protobuf:"bytes,2,opt,name=uri,proto3" json:"uri,omitempty"`
-	// RemoteAddr contains the network address that sent the request
-	RemoteAddr           string   `protobuf:"bytes,3,opt,name=remoteAddr,proto3" json:"remoteAddr,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
-}
-
-func (m *HTTPRequest) Reset()         { *m = HTTPRequest{} }
-func (m *HTTPRequest) String() string { return proto.CompactTextString(m) }
-func (*HTTPRequest) ProtoMessage()    {}
-func (*HTTPRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_581082325ef044c1, []int{1}
-}
-
-func (m *HTTPRequest) XXX_Unmarshal(b []byte) error {
-	return xxx_messageInfo_HTTPRequest.Unmarshal(m, b)
-}
-func (m *HTTPRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
-	return xxx_messageInfo_HTTPRequest.Marshal(b, m, deterministic)
-}
-func (m *HTTPRequest) XXX_Merge(src proto.Message) {
-	xxx_messageInfo_HTTPRequest.Merge(m, src)
-}
-func (m *HTTPRequest) XXX_Size() int {
-	return xxx_messageInfo_HTTPRequest.Size(m)
-}
-func (m *HTTPRequest) XXX_DiscardUnknown() {
-	xxx_messageInfo_HTTPRequest.DiscardUnknown(m)
-}
-
-var xxx_messageInfo_HTTPRequest proto.InternalMessageInfo
-
-func (m *HTTPRequest) GetMethod() string {
-	if m != nil {
-		return m.Method
-	}
-	return ""
-}
-
-func (m *HTTPRequest) GetUri() string {
-	if m != nil {
-		return m.Uri
-	}
-	return ""
-}
-
-func (m *HTTPRequest) GetRemoteAddr() string {
-	if m != nil {
-		return m.RemoteAddr
-	}
-	return ""
-}
-
-// Hook's data
-type Hook struct {
-	// Upload contains information about the upload that caused this hook
-	// to be fired.
-	Upload *Upload `protobuf:"bytes,1,opt,name=upload,proto3" json:"upload,omitempty"`
-	// HTTPRequest contains details about the HTTP request that reached
-	// tusd.
-	HttpRequest *HTTPRequest `protobuf:"bytes,2,opt,name=httpRequest,proto3" json:"httpRequest,omitempty"`
-	// The hook name
-	Name                 string   `protobuf:"bytes,3,opt,name=name,proto3" json:"name,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
-}
-
-func (m *Hook) Reset()         { *m = Hook{} }
-func (m *Hook) String() string { return proto.CompactTextString(m) }
-func (*Hook) ProtoMessage()    {}
-func (*Hook) Descriptor() ([]byte, []int) {
-	return fileDescriptor_581082325ef044c1, []int{2}
-}
-
-func (m *Hook) XXX_Unmarshal(b []byte) error {
-	return xxx_messageInfo_Hook.Unmarshal(m, b)
-}
-func (m *Hook) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
-	return xxx_messageInfo_Hook.Marshal(b, m, deterministic)
-}
-func (m *Hook) XXX_Merge(src proto.Message) {
-	xxx_messageInfo_Hook.Merge(m, src)
-}
-func (m *Hook) XXX_Size() int {
-	return xxx_messageInfo_Hook.Size(m)
-}
-func (m *Hook) XXX_DiscardUnknown() {
-	xxx_messageInfo_Hook.DiscardUnknown(m)
-}
-
-var xxx_messageInfo_Hook proto.InternalMessageInfo
-
-func (m *Hook) GetUpload() *Upload {
-	if m != nil {
-		return m.Upload
-	}
-	return nil
-}
-
-func (m *Hook) GetHttpRequest() *HTTPRequest {
-	if m != nil {
-		return m.HttpRequest
-	}
-	return nil
-}
-
-func (m *Hook) GetName() string {
-	if m != nil {
-		return m.Name
-	}
-	return ""
-}
-
-// Request data to send hook
-type SendRequest struct {
-	// The hook data
-	Hook                 *Hook    `protobuf:"bytes,1,opt,name=hook,proto3" json:"hook,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
-}
-
-func (m *SendRequest) Reset()         { *m = SendRequest{} }
-func (m *SendRequest) String() string { return proto.CompactTextString(m) }
-func (*SendRequest) ProtoMessage()    {}
-func (*SendRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_581082325ef044c1, []int{3}
-}
-
-func (m *SendRequest) XXX_Unmarshal(b []byte) error {
-	return xxx_messageInfo_SendRequest.Unmarshal(m, b)
-}
-func (m *SendRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
-	return xxx_messageInfo_SendRequest.Marshal(b, m, deterministic)
-}
-func (m *SendRequest) XXX_Merge(src proto.Message) {
-	xxx_messageInfo_SendRequest.Merge(m, src)
-}
-func (m *SendRequest) XXX_Size() int {
-	return xxx_messageInfo_SendRequest.Size(m)
-}
-func (m *SendRequest) XXX_DiscardUnknown() {
-	xxx_messageInfo_SendRequest.DiscardUnknown(m)
-}
-
-var xxx_messageInfo_SendRequest proto.InternalMessageInfo
-
-func (m *SendRequest) GetHook() *Hook {
-	if m != nil {
-		return m.Hook
-	}
-	return nil
-}
-
-// Response that contains data for sended hook
-type SendResponse struct {
-	// The response of the hook.
-	Response             *any.Any `protobuf:"bytes,1,opt,name=response,proto3" json:"response,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
-}
-
-func (m *SendResponse) Reset()         { *m = SendResponse{} }
-func (m *SendResponse) String() string { return proto.CompactTextString(m) }
-func (*SendResponse) ProtoMessage()    {}
-func (*SendResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_581082325ef044c1, []int{4}
-}
-
-func (m *SendResponse) XXX_Unmarshal(b []byte) error {
-	return xxx_messageInfo_SendResponse.Unmarshal(m, b)
-}
-func (m *SendResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
-	return xxx_messageInfo_SendResponse.Marshal(b, m, deterministic)
-}
-func (m *SendResponse) XXX_Merge(src proto.Message) {
-	xxx_messageInfo_SendResponse.Merge(m, src)
-}
-func (m *SendResponse) XXX_Size() int {
-	return xxx_messageInfo_SendResponse.Size(m)
-}
-func (m *SendResponse) XXX_DiscardUnknown() {
-	xxx_messageInfo_SendResponse.DiscardUnknown(m)
-}
-
-var xxx_messageInfo_SendResponse proto.InternalMessageInfo
-
-func (m *SendResponse) GetResponse() *any.Any {
-	if m != nil {
-		return m.Response
-	}
-	return nil
-}
-
-func init() {
-	proto.RegisterType((*Upload)(nil), "v1.Upload")
-	proto.RegisterMapType((map[string]string)(nil), "v1.Upload.MetaDataEntry")
-	proto.RegisterMapType((map[string]string)(nil), "v1.Upload.StorageEntry")
-	proto.RegisterType((*HTTPRequest)(nil), "v1.HTTPRequest")
-	proto.RegisterType((*Hook)(nil), "v1.Hook")
-	proto.RegisterType((*SendRequest)(nil), "v1.SendRequest")
-	proto.RegisterType((*SendResponse)(nil), "v1.SendResponse")
-}
-
-func init() {
-	proto.RegisterFile("v1/hook.proto", fileDescriptor_581082325ef044c1)
-}
-
-var fileDescriptor_581082325ef044c1 = []byte{
-	// 477 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x94, 0x52, 0x4d, 0x6f, 0xd3, 0x40,
-	0x10, 0x25, 0xb1, 0xeb, 0xd8, 0xe3, 0xb6, 0x54, 0xab, 0x0a, 0x96, 0xa8, 0x42, 0x96, 0x0f, 0xc8,
-	0x52, 0x25, 0x07, 0x07, 0x0e, 0x28, 0x5c, 0xa8, 0x54, 0x50, 0x39, 0x20, 0xaa, 0x4d, 0x11, 0xe7,
-	0x2d, 0xde, 0x24, 0x56, 0x1c, 0xaf, 0xbb, 0x5e, 0x5b, 0x0a, 0x3f, 0x8a, 0xdf, 0x88, 0xf6, 0xc3,
-	0x8d, 0xe9, 0x8d, 0x93, 0x67, 0xde, 0xbc, 0x79, 0xf3, 0x3c, 0x3b, 0x70, 0xd2, 0x65, 0xb3, 0x0d,
-	0xe7, 0xdb, 0xb4, 0x16, 0x5c, 0x72, 0x34, 0xee, 0xb2, 0xe9, 0xab, 0x35, 0xe7, 0xeb, 0x92, 0xcd,
-	0x34, 0x72, 0xdf, 0xae, 0x66, 0xb4, 0xda, 0x9b, 0x72, 0xfc, 0xc7, 0x01, 0xef, 0x47, 0x5d, 0x72,
-	0x9a, 0xa3, 0x53, 0x18, 0x17, 0x39, 0x1e, 0x45, 0xa3, 0x24, 0x20, 0xe3, 0x22, 0x47, 0x08, 0xdc,
-	0x65, 0xf1, 0x9b, 0xe1, 0x71, 0x34, 0x4a, 0x1c, 0xa2, 0x63, 0xf4, 0x06, 0x4e, 0xd5, 0xf7, 0x6b,
-	0x73, 0xcd, 0x56, 0x4c, 0x08, 0x96, 0x63, 0x27, 0x1a, 0x25, 0x3e, 0x79, 0x82, 0xa2, 0x17, 0xe0,
-	0x7d, 0x5f, 0xad, 0x1a, 0x26, 0xb1, 0xab, 0xbb, 0x6d, 0x86, 0xde, 0x83, 0xbf, 0x63, 0x92, 0x5e,
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-}
-
-// Reference imports to suppress errors if they are not otherwise used.
-var _ context.Context
-var _ grpc.ClientConnInterface
-
-// This is a compile-time assertion to ensure that this generated file
-// is compatible with the grpc package it is being compiled against.
-const _ = grpc.SupportPackageIsVersion6
-
-// HookServiceClient is the client API for HookService service.
-//
-// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
-type HookServiceClient interface {
-	// Sends a hook
-	Send(ctx context.Context, in *SendRequest, opts ...grpc.CallOption) (*SendResponse, error)
-}
-
-type hookServiceClient struct {
-	cc grpc.ClientConnInterface
-}
-
-func NewHookServiceClient(cc grpc.ClientConnInterface) HookServiceClient {
-	return &hookServiceClient{cc}
-}
-
-func (c *hookServiceClient) Send(ctx context.Context, in *SendRequest, opts ...grpc.CallOption) (*SendResponse, error) {
-	out := new(SendResponse)
-	err := c.cc.Invoke(ctx, "/v1.HookService/Send", in, out, opts...)
-	if err != nil {
-		return nil, err
-	}
-	return out, nil
-}
-
-// HookServiceServer is the server API for HookService service.
-type HookServiceServer interface {
-	// Sends a hook
-	Send(context.Context, *SendRequest) (*SendResponse, error)
-}
-
-// UnimplementedHookServiceServer can be embedded to have forward compatible implementations.
-type UnimplementedHookServiceServer struct {
-}
-
-func (*UnimplementedHookServiceServer) Send(ctx context.Context, req *SendRequest) (*SendResponse, error) {
-	return nil, status.Errorf(codes.Unimplemented, "method Send not implemented")
-}
-
-func RegisterHookServiceServer(s *grpc.Server, srv HookServiceServer) {
-	s.RegisterService(&_HookService_serviceDesc, srv)
-}
-
-func _HookService_Send_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
-	in := new(SendRequest)
-	if err := dec(in); err != nil {
-		return nil, err
-	}
-	if interceptor == nil {
-		return srv.(HookServiceServer).Send(ctx, in)
-	}
-	info := &grpc.UnaryServerInfo{
-		Server:     srv,
-		FullMethod: "/v1.HookService/Send",
-	}
-	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return srv.(HookServiceServer).Send(ctx, req.(*SendRequest))
-	}
-	return interceptor(ctx, in, info, handler)
-}
-
-var _HookService_serviceDesc = grpc.ServiceDesc{
-	ServiceName: "v1.HookService",
-	HandlerType: (*HookServiceServer)(nil),
-	Methods: []grpc.MethodDesc{
-		{
-			MethodName: "Send",
-			Handler:    _HookService_Send_Handler,
-		},
-	},
-	Streams:  []grpc.StreamDesc{},
-	Metadata: "v1/hook.proto",
-}

pkg/proto/v2/hook.pb.go

@@ -0,0 +1,555 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: v2/hook.proto
+
+package v2
+
+import (
+	context "context"
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+	math "math"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
+
+// Hook's data
+type HookRequest struct {
+	Type                 string   `protobuf:"bytes,1,opt,name=type,proto3" json:"type,omitempty"`
+	Event                *Event   `protobuf:"bytes,2,opt,name=event,proto3" json:"event,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *HookRequest) Reset()         { *m = HookRequest{} }
+func (m *HookRequest) String() string { return proto.CompactTextString(m) }
+func (*HookRequest) ProtoMessage()    {}
+func (*HookRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_938ab51c60d4b622, []int{0}
+}
+
+func (m *HookRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_HookRequest.Unmarshal(m, b)
+}
+func (m *HookRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_HookRequest.Marshal(b, m, deterministic)
+}
+func (m *HookRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_HookRequest.Merge(m, src)
+}
+func (m *HookRequest) XXX_Size() int {
+	return xxx_messageInfo_HookRequest.Size(m)
+}
+func (m *HookRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_HookRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_HookRequest proto.InternalMessageInfo
+
+func (m *HookRequest) GetType() string {
+	if m != nil {
+		return m.Type
+	}
+	return ""
+}
+
+func (m *HookRequest) GetEvent() *Event {
+	if m != nil {
+		return m.Event
+	}
+	return nil
+}
+
+type Event struct {
+	Upload               *FileInfo    `protobuf:"bytes,1,opt,name=upload,proto3" json:"upload,omitempty"`
+	HttpRequest          *HTTPRequest `protobuf:"bytes,2,opt,name=httpRequest,proto3" json:"httpRequest,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}     `json:"-"`
+	XXX_unrecognized     []byte       `json:"-"`
+	XXX_sizecache        int32        `json:"-"`
+}
+
+func (m *Event) Reset()         { *m = Event{} }
+func (m *Event) String() string { return proto.CompactTextString(m) }
+func (*Event) ProtoMessage()    {}
+func (*Event) Descriptor() ([]byte, []int) {
+	return fileDescriptor_938ab51c60d4b622, []int{1}
+}
+
+func (m *Event) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Event.Unmarshal(m, b)
+}
+func (m *Event) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Event.Marshal(b, m, deterministic)
+}
+func (m *Event) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Event.Merge(m, src)
+}
+func (m *Event) XXX_Size() int {
+	return xxx_messageInfo_Event.Size(m)
+}
+func (m *Event) XXX_DiscardUnknown() {
+	xxx_messageInfo_Event.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Event proto.InternalMessageInfo
+
+func (m *Event) GetUpload() *FileInfo {
+	if m != nil {
+		return m.Upload
+	}
+	return nil
+}
+
+func (m *Event) GetHttpRequest() *HTTPRequest {
+	if m != nil {
+		return m.HttpRequest
+	}
+	return nil
+}
+
+// TODO: Keep consistent naming capitalization
+// Uploaded data
+type FileInfo struct {
+	// Unique integer identifier of the uploaded file
+	Id string `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	// Total file size in bytes specified in the NewUpload call
+	Size int64 `protobuf:"varint,2,opt,name=size,proto3" json:"size,omitempty"`
+	// Indicates whether the total file size is deferred until later
+	SizeIsDeferred bool `protobuf:"varint,3,opt,name=sizeIsDeferred,proto3" json:"sizeIsDeferred,omitempty"`
+	// Offset in bytes (zero-based)
+	Offset   int64             `protobuf:"varint,4,opt,name=offset,proto3" json:"offset,omitempty"`
+	MetaData map[string]string `protobuf:"bytes,5,rep,name=metaData,proto3" json:"metaData,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	// Indicates that this is a partial upload which will later be used to form
+	// a final upload by concatenation. Partial uploads should not be processed
+	// when they are finished since they are only incomplete chunks of files.
+	IsPartial bool `protobuf:"varint,6,opt,name=isPartial,proto3" json:"isPartial,omitempty"`
+	// Indicates that this is a final upload
+	IsFinal bool `protobuf:"varint,7,opt,name=isFinal,proto3" json:"isFinal,omitempty"`
+	// If the upload is a final one (see IsFinal) this will be a non-empty
+	// ordered slice containing the ids of the uploads of which the final upload
+	// will consist after concatenation.
+	PartialUploads []string `protobuf:"bytes,8,rep,name=partialUploads,proto3" json:"partialUploads,omitempty"`
+	// Storage contains information about where the data storage saves the upload,
+	// for example a file path. The available values vary depending on what data
+	// store is used. This map may also be nil.
+	Storage              map[string]string `protobuf:"bytes,9,rep,name=storage,proto3" json:"storage,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
+	XXX_unrecognized     []byte            `json:"-"`
+	XXX_sizecache        int32             `json:"-"`
+}
+
+func (m *FileInfo) Reset()         { *m = FileInfo{} }
+func (m *FileInfo) String() string { return proto.CompactTextString(m) }
+func (*FileInfo) ProtoMessage()    {}
+func (*FileInfo) Descriptor() ([]byte, []int) {
+	return fileDescriptor_938ab51c60d4b622, []int{2}
+}
+
+func (m *FileInfo) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_FileInfo.Unmarshal(m, b)
+}
+func (m *FileInfo) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_FileInfo.Marshal(b, m, deterministic)
+}
+func (m *FileInfo) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_FileInfo.Merge(m, src)
+}
+func (m *FileInfo) XXX_Size() int {
+	return xxx_messageInfo_FileInfo.Size(m)
+}
+func (m *FileInfo) XXX_DiscardUnknown() {
+	xxx_messageInfo_FileInfo.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_FileInfo proto.InternalMessageInfo
+
+func (m *FileInfo) GetId() string {
+	if m != nil {
+		return m.Id
+	}
+	return ""
+}
+
+func (m *FileInfo) GetSize() int64 {
+	if m != nil {
+		return m.Size
+	}
+	return 0
+}
+
+func (m *FileInfo) GetSizeIsDeferred() bool {
+	if m != nil {
+		return m.SizeIsDeferred
+	}
+	return false
+}
+
+func (m *FileInfo) GetOffset() int64 {
+	if m != nil {
+		return m.Offset
+	}
+	return 0
+}
+
+func (m *FileInfo) GetMetaData() map[string]string {
+	if m != nil {
+		return m.MetaData
+	}
+	return nil
+}
+
+func (m *FileInfo) GetIsPartial() bool {
+	if m != nil {
+		return m.IsPartial
+	}
+	return false
+}
+
+func (m *FileInfo) GetIsFinal() bool {
+	if m != nil {
+		return m.IsFinal
+	}
+	return false
+}
+
+func (m *FileInfo) GetPartialUploads() []string {
+	if m != nil {
+		return m.PartialUploads
+	}
+	return nil
+}
+
+func (m *FileInfo) GetStorage() map[string]string {
+	if m != nil {
+		return m.Storage
+	}
+	return nil
+}
+
+type HTTPRequest struct {
+	// Method is the HTTP method, e.g. POST or PATCH
+	Method string `protobuf:"bytes,1,opt,name=method,proto3" json:"method,omitempty"`
+	// URI is the full HTTP request URI, e.g. /files/fooo
+	Uri string `protobuf:"bytes,2,opt,name=uri,proto3" json:"uri,omitempty"`
+	// RemoteAddr contains the network address that sent the request
+	RemoteAddr           string            `protobuf:"bytes,3,opt,name=remoteAddr,proto3" json:"remoteAddr,omitempty"`
+	Header               map[string]string `protobuf:"bytes,4,rep,name=header,proto3" json:"header,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
+	XXX_unrecognized     []byte            `json:"-"`
+	XXX_sizecache        int32             `json:"-"`
+}
+
+func (m *HTTPRequest) Reset()         { *m = HTTPRequest{} }
+func (m *HTTPRequest) String() string { return proto.CompactTextString(m) }
+func (*HTTPRequest) ProtoMessage()    {}
+func (*HTTPRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_938ab51c60d4b622, []int{3}
+}
+
+func (m *HTTPRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_HTTPRequest.Unmarshal(m, b)
+}
+func (m *HTTPRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_HTTPRequest.Marshal(b, m, deterministic)
+}
+func (m *HTTPRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_HTTPRequest.Merge(m, src)
+}
+func (m *HTTPRequest) XXX_Size() int {
+	return xxx_messageInfo_HTTPRequest.Size(m)
+}
+func (m *HTTPRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_HTTPRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_HTTPRequest proto.InternalMessageInfo
+
+func (m *HTTPRequest) GetMethod() string {
+	if m != nil {
+		return m.Method
+	}
+	return ""
+}
+
+func (m *HTTPRequest) GetUri() string {
+	if m != nil {
+		return m.Uri
+	}
+	return ""
+}
+
+func (m *HTTPRequest) GetRemoteAddr() string {
+	if m != nil {
+		return m.RemoteAddr
+	}
+	return ""
+}
+
+func (m *HTTPRequest) GetHeader() map[string]string {
+	if m != nil {
+		return m.Header
+	}
+	return nil
+}
+
+type HookResponse struct {
+	HttpResponse         *HTTPResponse `protobuf:"bytes,1,opt,name=httpResponse,proto3" json:"httpResponse,omitempty"`
+	RejectUpload         bool          `protobuf:"varint,2,opt,name=rejectUpload,proto3" json:"rejectUpload,omitempty"`
+	StopUpload           bool          `protobuf:"varint,3,opt,name=stopUpload,proto3" json:"stopUpload,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}      `json:"-"`
+	XXX_unrecognized     []byte        `json:"-"`
+	XXX_sizecache        int32         `json:"-"`
+}
+
+func (m *HookResponse) Reset()         { *m = HookResponse{} }
+func (m *HookResponse) String() string { return proto.CompactTextString(m) }
+func (*HookResponse) ProtoMessage()    {}
+func (*HookResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_938ab51c60d4b622, []int{4}
+}
+
+func (m *HookResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_HookResponse.Unmarshal(m, b)
+}
+func (m *HookResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_HookResponse.Marshal(b, m, deterministic)
+}
+func (m *HookResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_HookResponse.Merge(m, src)
+}
+func (m *HookResponse) XXX_Size() int {
+	return xxx_messageInfo_HookResponse.Size(m)
+}
+func (m *HookResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_HookResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_HookResponse proto.InternalMessageInfo
+
+func (m *HookResponse) GetHttpResponse() *HTTPResponse {
+	if m != nil {
+		return m.HttpResponse
+	}
+	return nil
+}
+
+func (m *HookResponse) GetRejectUpload() bool {
+	if m != nil {
+		return m.RejectUpload
+	}
+	return false
+}
+
+func (m *HookResponse) GetStopUpload() bool {
+	if m != nil {
+		return m.StopUpload
+	}
+	return false
+}
+
+type HTTPResponse struct {
+	StatusCode           int64             `protobuf:"varint,1,opt,name=statusCode,proto3" json:"statusCode,omitempty"`
+	Headers              map[string]string `protobuf:"bytes,2,rep,name=headers,proto3" json:"headers,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	Body                 string            `protobuf:"bytes,3,opt,name=body,proto3" json:"body,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}          `json:"-"`
+	XXX_unrecognized     []byte            `json:"-"`
+	XXX_sizecache        int32             `json:"-"`
+}
+
+func (m *HTTPResponse) Reset()         { *m = HTTPResponse{} }
+func (m *HTTPResponse) String() string { return proto.CompactTextString(m) }
+func (*HTTPResponse) ProtoMessage()    {}
+func (*HTTPResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_938ab51c60d4b622, []int{5}
+}
+
+func (m *HTTPResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_HTTPResponse.Unmarshal(m, b)
+}
+func (m *HTTPResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_HTTPResponse.Marshal(b, m, deterministic)
+}
+func (m *HTTPResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_HTTPResponse.Merge(m, src)
+}
+func (m *HTTPResponse) XXX_Size() int {
+	return xxx_messageInfo_HTTPResponse.Size(m)
+}
+func (m *HTTPResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_HTTPResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_HTTPResponse proto.InternalMessageInfo
+
+func (m *HTTPResponse) GetStatusCode() int64 {
+	if m != nil {
+		return m.StatusCode
+	}
+	return 0
+}
+
+func (m *HTTPResponse) GetHeaders() map[string]string {
+	if m != nil {
+		return m.Headers
+	}
+	return nil
+}
+
+func (m *HTTPResponse) GetBody() string {
+	if m != nil {
+		return m.Body
+	}
+	return ""
+}
+
+func init() {
+	proto.RegisterType((*HookRequest)(nil), "v2.HookRequest")
+	proto.RegisterType((*Event)(nil), "v2.Event")
+	proto.RegisterType((*FileInfo)(nil), "v2.FileInfo")
+	proto.RegisterMapType((map[string]string)(nil), "v2.FileInfo.MetaDataEntry")
+	proto.RegisterMapType((map[string]string)(nil), "v2.FileInfo.StorageEntry")
+	proto.RegisterType((*HTTPRequest)(nil), "v2.HTTPRequest")
+	proto.RegisterMapType((map[string]string)(nil), "v2.HTTPRequest.HeaderEntry")
+	proto.RegisterType((*HookResponse)(nil), "v2.HookResponse")
+	proto.RegisterType((*HTTPResponse)(nil), "v2.HTTPResponse")
+	proto.RegisterMapType((map[string]string)(nil), "v2.HTTPResponse.HeadersEntry")
+}
+
+func init() {
+	proto.RegisterFile("v2/hook.proto", fileDescriptor_938ab51c60d4b622)
+}
+
+var fileDescriptor_938ab51c60d4b622 = []byte{
+	// 578 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x94, 0x54, 0xdb, 0x6e, 0xd3, 0x40,
+	0x10, 0xc5, 0x71, 0x73, 0xf1, 0x38, 0x2d, 0xd5, 0x0a, 0xa1, 0x25, 0xdc, 0x22, 0x0b, 0xa1, 0x3c,
+	0x05, 0xd5, 0x45, 0x5c, 0xca, 0x0b, 0x97, 0xb6, 0x4a, 0x1f, 0x90, 0xaa, 0xa5, 0xbc, 0xb3, 0xc5,
+	0x13, 0x62, 0xe2, 0x7a, 0xcd, 0xee, 0xc6, 0x52, 0xf8, 0x02, 0x3e, 0x08, 0x89, 0x4f, 0xe0, 0xb7,
+	0xd0, 0x5e, 0x42, 0x9c, 0xbc, 0xe5, 0xc9, 0x3b, 0x67, 0xce, 0xcc, 0x9e, 0x3d, 0x3b, 0x5e, 0xd8,
+	0xaf, 0xd3, 0x67, 0x33, 0x21, 0xe6, 0xe3, 0x4a, 0x0a, 0x2d, 0x48, 0xab, 0x4e, 0x93, 0xf7, 0x10,
+	0x4f, 0x84, 0x98, 0x33, 0xfc, 0xb1, 0x40, 0xa5, 0x09, 0x81, 0x3d, 0xbd, 0xac, 0x90, 0x06, 0xc3,
+	0x60, 0x14, 0x31, 0xbb, 0x26, 0x8f, 0xa1, 0x8d, 0x35, 0x96, 0x9a, 0xb6, 0x86, 0xc1, 0x28, 0x4e,
+	0xa3, 0x71, 0x9d, 0x8e, 0xcf, 0x0c, 0xc0, 0x1c, 0x9e, 0x7c, 0x81, 0xb6, 0x8d, 0xc9, 0x13, 0xe8,
+	0x2c, 0xaa, 0x42, 0xf0, 0xcc, 0xd6, 0xc7, 0x69, 0xdf, 0x50, 0xcf, 0xf3, 0x02, 0x2f, 0xca, 0xa9,
+	0x60, 0x3e, 0x47, 0x8e, 0x20, 0x9e, 0x69, 0x5d, 0xf9, 0x2d, 0x7d, 0xd7, 0xdb, 0x86, 0x3a, 0xb9,
+	0xba, 0xba, 0xf4, 0x30, 0x6b, 0x72, 0x92, 0xdf, 0x21, 0xf4, 0x56, 0x7d, 0xc8, 0x01, 0xb4, 0xf2,
+	0xcc, 0x2b, 0x6c, 0xe5, 0x99, 0xd1, 0xac, 0xf2, 0x9f, 0x68, 0x1b, 0x85, 0xcc, 0xae, 0xc9, 0x53,
+	0x38, 0x30, 0xdf, 0x0b, 0x75, 0x8a, 0x53, 0x94, 0x12, 0x33, 0x1a, 0x0e, 0x83, 0x51, 0x8f, 0x6d,
+	0xa1, 0xe4, 0x2e, 0x74, 0xc4, 0x74, 0xaa, 0x50, 0xd3, 0x3d, 0x5b, 0xed, 0x23, 0xf2, 0x02, 0x7a,
+	0x37, 0xa8, 0xf9, 0x29, 0xd7, 0x9c, 0xb6, 0x87, 0xe1, 0x28, 0x4e, 0x07, 0xcd, 0xb3, 0x8c, 0x3f,
+	0xfa, 0xe4, 0x59, 0xa9, 0xe5, 0x92, 0xfd, 0xe7, 0x92, 0x07, 0x10, 0xe5, 0xea, 0x92, 0x4b, 0x9d,
+	0xf3, 0x82, 0x76, 0xec, 0x96, 0x6b, 0x80, 0x50, 0xe8, 0xe6, 0xea, 0x3c, 0x2f, 0x79, 0x41, 0xbb,
+	0x36, 0xb7, 0x0a, 0x8d, 0xde, 0xca, 0x91, 0x3e, 0x5b, 0x93, 0x14, 0xed, 0x0d, 0xc3, 0x51, 0xc4,
+	0xb6, 0x50, 0x72, 0x0c, 0x5d, 0xa5, 0x85, 0xe4, 0xdf, 0x90, 0x46, 0x56, 0xd6, 0xbd, 0x0d, 0x59,
+	0x9f, 0x5c, 0xce, 0xa9, 0x5a, 0x31, 0x07, 0x6f, 0x60, 0x7f, 0x43, 0x2f, 0x39, 0x84, 0x70, 0x8e,
+	0x4b, 0x6f, 0xa1, 0x59, 0x92, 0x3b, 0xd0, 0xae, 0x79, 0xb1, 0x70, 0x26, 0x46, 0xcc, 0x05, 0x27,
+	0xad, 0x57, 0xc1, 0xe0, 0x04, 0xfa, 0xcd, 0xae, 0xbb, 0xd4, 0x26, 0x7f, 0x03, 0x88, 0x1b, 0x77,
+	0x6a, 0xdc, 0xbe, 0x41, 0x3d, 0x13, 0xab, 0xdb, 0xf3, 0x91, 0xe9, 0xb9, 0x90, 0xb9, 0xaf, 0x37,
+	0x4b, 0xf2, 0x08, 0x40, 0xe2, 0x8d, 0xd0, 0xf8, 0x2e, 0xcb, 0xa4, 0xbd, 0xbb, 0x88, 0x35, 0x10,
+	0x72, 0x0c, 0x9d, 0x19, 0xf2, 0x0c, 0x25, 0xdd, 0xb3, 0x36, 0xdc, 0xdf, 0x1a, 0x9f, 0xf1, 0xc4,
+	0x66, 0x9d, 0x11, 0x9e, 0x3a, 0x78, 0x0d, 0x71, 0x03, 0xde, 0xe9, 0x24, 0xbf, 0x02, 0xe8, 0xbb,
+	0xff, 0x44, 0x55, 0xa2, 0x54, 0x48, 0x9e, 0x43, 0xdf, 0x0d, 0xa8, 0x8b, 0xfd, 0xc0, 0x1f, 0xae,
+	0x65, 0x38, 0x9c, 0x6d, 0xb0, 0x48, 0x02, 0x7d, 0x89, 0xdf, 0xf1, 0xab, 0x76, 0xf7, 0x69, 0xf7,
+	0xe9, 0xb1, 0x0d, 0xcc, 0x1c, 0x5d, 0x69, 0x51, 0x79, 0x86, 0x1b, 0xdb, 0x06, 0x92, 0xfc, 0x31,
+	0x52, 0x1a, 0x5b, 0xb8, 0x02, 0xae, 0x17, 0xea, 0x83, 0xc8, 0x9c, 0x90, 0x90, 0x35, 0x10, 0xf2,
+	0x12, 0xba, 0xce, 0x00, 0x45, 0x5b, 0xd6, 0xac, 0x87, 0xdb, 0x2a, 0xbd, 0x5b, 0xca, 0xcf, 0x8d,
+	0x67, 0x9b, 0x1f, 0xeb, 0x5a, 0x64, 0x4b, 0x6f, 0xbf, 0x5d, 0x9b, 0x71, 0x68, 0x92, 0x77, 0x31,
+	0x31, 0x7d, 0xeb, 0xde, 0x9a, 0x09, 0x2f, 0xb3, 0x02, 0x25, 0x39, 0x02, 0xb8, 0x28, 0x6b, 0x31,
+	0x47, 0x03, 0x12, 0xf7, 0x00, 0xac, 0x9f, 0xa2, 0xc1, 0xe1, 0x1a, 0x70, 0x2a, 0x93, 0x5b, 0xd7,
+	0x1d, 0xfb, 0x70, 0x1d, 0xff, 0x0b, 0x00, 0x00, 0xff, 0xff, 0xdc, 0x73, 0x61, 0x1c, 0xc9, 0x04,
+	0x00, 0x00,
+}
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ context.Context
+var _ grpc.ClientConnInterface
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+const _ = grpc.SupportPackageIsVersion6
+
+// HookHandlerClient is the client API for HookHandler service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
+type HookHandlerClient interface {
+	// Sends a hook
+	InvokeHook(ctx context.Context, in *HookRequest, opts ...grpc.CallOption) (*HookResponse, error)
+}
+
+type hookHandlerClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewHookHandlerClient(cc grpc.ClientConnInterface) HookHandlerClient {
+	return &hookHandlerClient{cc}
+}
+
+func (c *hookHandlerClient) InvokeHook(ctx context.Context, in *HookRequest, opts ...grpc.CallOption) (*HookResponse, error) {
+	out := new(HookResponse)
+	err := c.cc.Invoke(ctx, "/v2.HookHandler/InvokeHook", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// HookHandlerServer is the server API for HookHandler service.
+type HookHandlerServer interface {
+	// Sends a hook
+	InvokeHook(context.Context, *HookRequest) (*HookResponse, error)
+}
+
+// UnimplementedHookHandlerServer can be embedded to have forward compatible implementations.
+type UnimplementedHookHandlerServer struct {
+}
+
+func (*UnimplementedHookHandlerServer) InvokeHook(ctx context.Context, req *HookRequest) (*HookResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method InvokeHook not implemented")
+}
+
+func RegisterHookHandlerServer(s *grpc.Server, srv HookHandlerServer) {
+	s.RegisterService(&_HookHandler_serviceDesc, srv)
+}
+
+func _HookHandler_InvokeHook_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(HookRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(HookHandlerServer).InvokeHook(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/v2.HookHandler/InvokeHook",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(HookHandlerServer).InvokeHook(ctx, req.(*HookRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+var _HookHandler_serviceDesc = grpc.ServiceDesc{
+	ServiceName: "v2.HookHandler",
+	HandlerType: (*HookHandlerServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "InvokeHook",
+			Handler:    _HookHandler_InvokeHook_Handler,
+		},
+	},
+	Streams:  []grpc.StreamDesc{},
+	Metadata: "v2/hook.proto",
+}

pkg/s3store/minio_s3_api.go

@@ -0,0 +1,180 @@
+package s3store
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os"
+
+	"github.com/aws/aws-sdk-go/aws/request"
+	"github.com/aws/aws-sdk-go/service/s3"
+	"github.com/minio/minio-go/v7"
+)
+
+type MinioS3API struct {
+	client *minio.Core
+}
+
+func NewMinioS3API(client *minio.Core) S3API {
+	return MinioS3API{
+		client: client,
+	}
+}
+
+func (s MinioS3API) PutObjectWithContext(ctx context.Context, input *s3.PutObjectInput, opt ...request.Option) (*s3.PutObjectOutput, error) {
+	var objectSize int64
+	if input.ContentLength != nil {
+		objectSize = *input.ContentLength
+	} else {
+		size, err := input.Body.Seek(0, os.SEEK_END)
+		if err != nil {
+			return nil, err
+		}
+		_, err = input.Body.Seek(0, os.SEEK_SET)
+		if err != nil {
+			return nil, err
+		}
+		objectSize = size
+	}
+
+	// TODO: Should we use the more low-level Core.PutObject here?
+	_, err := s.client.Client.PutObject(ctx, *input.Bucket, *input.Key, input.Body, objectSize, minio.PutObjectOptions{
+		DisableMultipart: true,
+		SendContentMd5:   false, // TODO: Make configurable
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return &s3.PutObjectOutput{}, nil
+}
+
+func (s MinioS3API) ListPartsWithContext(ctx context.Context, input *s3.ListPartsInput, opt ...request.Option) (*s3.ListPartsOutput, error) {
+	partNumberMarker := 0
+	if input.PartNumberMarker != nil {
+		partNumberMarker = int(*input.PartNumberMarker)
+	}
+	res, err := s.client.ListObjectParts(ctx, *input.Bucket, *input.Key, *input.UploadId, partNumberMarker, 0)
+	if err != nil {
+		return nil, err
+	}
+
+	print(res.ObjectParts)
+
+	parts := make([]*s3.Part, len(res.ObjectParts))
+	for i, p := range res.ObjectParts {
+		partNumber := int64(p.PartNumber)
+		parts[i] = &s3.Part{
+			ETag:       &p.ETag,
+			PartNumber: &partNumber,
+			Size:       &p.Size,
+		}
+	}
+
+	nextPartNumberMarker := int64(res.NextPartNumberMarker)
+	return &s3.ListPartsOutput{
+		IsTruncated:          &res.IsTruncated,
+		NextPartNumberMarker: &nextPartNumberMarker,
+		Parts:                parts,
+	}, nil
+}
+
+func (s MinioS3API) UploadPartWithContext(ctx context.Context, input *s3.UploadPartInput, opt ...request.Option) (*s3.UploadPartOutput, error) {
+	var objectSize int64
+	if input.ContentLength != nil {
+		objectSize = *input.ContentLength
+	} else {
+		return nil, errors.New("missing ContentLength")
+	}
+	partNumber := int(*input.PartNumber)
+
+	part, err := s.client.PutObjectPart(ctx, *input.Bucket, *input.Key, *input.UploadId, partNumber, input.Body, objectSize, "", "", nil)
+	if err != nil {
+		return nil, err
+	}
+
+	return &s3.UploadPartOutput{
+		ETag: &part.ETag,
+	}, nil
+}
+
+func (s MinioS3API) GetObjectWithContext(ctx context.Context, input *s3.GetObjectInput, opt ...request.Option) (*s3.GetObjectOutput, error) {
+	body, info, _, err := s.client.GetObject(ctx, *input.Bucket, *input.Key, minio.GetObjectOptions{})
+	if err != nil {
+		return nil, err
+	}
+
+	return &s3.GetObjectOutput{
+		Body:          body,
+		ContentLength: &info.Size,
+	}, nil
+}
+
+func (s MinioS3API) HeadObjectWithContext(ctx context.Context, input *s3.HeadObjectInput, opt ...request.Option) (*s3.HeadObjectOutput, error) {
+	info, err := s.client.StatObject(ctx, *input.Bucket, *input.Key, minio.StatObjectOptions{})
+	if err != nil {
+		return nil, err
+	}
+
+	print(info.Size)
+
+	return &s3.HeadObjectOutput{
+		ContentLength: &info.Size,
+	}, nil
+}
+
+func (s MinioS3API) CreateMultipartUploadWithContext(ctx context.Context, input *s3.CreateMultipartUploadInput, opt ...request.Option) (*s3.CreateMultipartUploadOutput, error) {
+	metadata := make(map[string]string, len(input.Metadata))
+	for key, value := range input.Metadata {
+		metadata[key] = *value
+	}
+
+	uploadId, err := s.client.NewMultipartUpload(ctx, *input.Bucket, *input.Key, minio.PutObjectOptions{
+		UserMetadata: metadata,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return &s3.CreateMultipartUploadOutput{
+		UploadId: &uploadId,
+	}, nil
+}
+
+func (s MinioS3API) AbortMultipartUploadWithContext(ctx context.Context, input *s3.AbortMultipartUploadInput, opt ...request.Option) (*s3.AbortMultipartUploadOutput, error) {
+	return nil, fmt.Errorf("AbortMultipartUploadWithContext not implemented")
+}
+
+func (s MinioS3API) DeleteObjectWithContext(ctx context.Context, input *s3.DeleteObjectInput, opt ...request.Option) (*s3.DeleteObjectOutput, error) {
+	err := s.client.RemoveObject(ctx, *input.Bucket, *input.Key, minio.RemoveObjectOptions{})
+	if err != nil {
+		return nil, err
+	}
+
+	return &s3.DeleteObjectOutput{}, nil
+}
+
+func (s MinioS3API) DeleteObjectsWithContext(ctx context.Context, input *s3.DeleteObjectsInput, opt ...request.Option) (*s3.DeleteObjectsOutput, error) {
+	return nil, fmt.Errorf("DeleteObjectsWithContext not implemented")
+}
+
+func (s MinioS3API) CompleteMultipartUploadWithContext(ctx context.Context, input *s3.CompleteMultipartUploadInput, opt ...request.Option) (*s3.CompleteMultipartUploadOutput, error) {
+	parts := make([]minio.CompletePart, len(input.MultipartUpload.Parts))
+	for i, p := range input.MultipartUpload.Parts {
+		parts[i] = minio.CompletePart{
+			PartNumber: int(*p.PartNumber),
+			ETag:       *p.ETag,
+		}
+	}
+
+	_, err := s.client.CompleteMultipartUpload(ctx, *input.Bucket, *input.Key, *input.UploadId, parts, minio.PutObjectOptions{})
+	if err != nil {
+		return nil, err
+	}
+
+	return &s3.CompleteMultipartUploadOutput{}, nil
+}
+
+func (s MinioS3API) UploadPartCopyWithContext(ctx context.Context, input *s3.UploadPartCopyInput, opt ...request.Option) (*s3.UploadPartCopyOutput, error) {
+	return nil, fmt.Errorf("UploadPartCopyWithContext not implemented")
+}

pkg/s3store/s3store.go

@@ -83,6 +83,9 @@ import (
 	"sync"
 	"time"
 
+	"github.com/minio/minio-go/v7"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/tus/tusd/internal/semaphore"
 	"github.com/tus/tusd/internal/uid"
 	"github.com/tus/tusd/pkg/handler"
 
@@ -156,13 +159,43 @@ type S3Store struct {
 	// CPU, so it might be desirable to disable them.
 	// Note that this property is experimental and might be removed in the future!
 	DisableContentHashes bool
+
+	// uploadSemaphore limits the number of concurrent multipart part uploads to S3.
+	uploadSemaphore semaphore.Semaphore
+
+	// requestDurationMetric holds the prometheus instance for storing the request durations.
+	requestDurationMetric *prometheus.SummaryVec
+
+	// diskWriteDurationMetric holds the prometheus instance for storing the time it takes to write chunks to disk.
+	diskWriteDurationMetric prometheus.Summary
+
+	// uploadSemaphoreDemandMetric holds the prometheus instance for storing the demand on the upload semaphore
+	uploadSemaphoreDemandMetric prometheus.Gauge
+
+	// uploadSemaphoreLimitMetric holds the prometheus instance for storing the limit on the upload semaphore
+	uploadSemaphoreLimitMetric prometheus.Gauge
 }
 
+// The labels to use for observing and storing request duration. One label per operation.
+const (
+	metricGetInfoObject           = "get_info_object"
+	metricPutInfoObject           = "put_info_object"
+	metricCreateMultipartUpload   = "create_multipart_upload"
+	metricCompleteMultipartUpload = "complete_multipart_upload"
+	metricUploadPart              = "upload_part"
+	metricListParts               = "list_parts"
+	metricHeadPartObject          = "head_part_object"
+	metricGetPartObject           = "get_part_object"
+	metricPutPartObject           = "put_part_object"
+	metricDeletePartObject        = "delete_part_object"
+)
+
 type S3API interface {
 	PutObjectWithContext(ctx context.Context, input *s3.PutObjectInput, opt ...request.Option) (*s3.PutObjectOutput, error)
 	ListPartsWithContext(ctx context.Context, input *s3.ListPartsInput, opt ...request.Option) (*s3.ListPartsOutput, error)
 	UploadPartWithContext(ctx context.Context, input *s3.UploadPartInput, opt ...request.Option) (*s3.UploadPartOutput, error)
 	GetObjectWithContext(ctx context.Context, input *s3.GetObjectInput, opt ...request.Option) (*s3.GetObjectOutput, error)
+	HeadObjectWithContext(ctx context.Context, input *s3.HeadObjectInput, opt ...request.Option) (*s3.HeadObjectOutput, error)
 	CreateMultipartUploadWithContext(ctx context.Context, input *s3.CreateMultipartUploadInput, opt ...request.Option) (*s3.CreateMultipartUploadOutput, error)
 	AbortMultipartUploadWithContext(ctx context.Context, input *s3.AbortMultipartUploadInput, opt ...request.Option) (*s3.AbortMultipartUploadOutput, error)
 	DeleteObjectWithContext(ctx context.Context, input *s3.DeleteObjectInput, opt ...request.Option) (*s3.DeleteObjectOutput, error)
@@ -177,17 +210,52 @@ type s3APIForPresigning interface {
 
 // New constructs a new storage using the supplied bucket and service object.
 func New(bucket string, service S3API) S3Store {
-	return S3Store{
-		Bucket:             bucket,
-		Service:            service,
-		MaxPartSize:        5 * 1024 * 1024 * 1024,
-		MinPartSize:        5 * 1024 * 1024,
-		PreferredPartSize:  50 * 1024 * 1024,
-		MaxMultipartParts:  10000,
-		MaxObjectSize:      5 * 1024 * 1024 * 1024 * 1024,
-		MaxBufferedParts:   20,
-		TemporaryDirectory: "",
+	requestDurationMetric := prometheus.NewSummaryVec(prometheus.SummaryOpts{
+		Name:       "tusd_s3_request_duration_ms",
+		Help:       "Duration of requests sent to S3 in milliseconds per operation",
+		Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
+	}, []string{"operation"})
+
+	diskWriteDurationMetric := prometheus.NewSummary(prometheus.SummaryOpts{
+		Name:       "tusd_s3_disk_write_duration_ms",
+		Help:       "Duration of chunk writes to disk in milliseconds",
+		Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
+	})
+
+	uploadSemaphoreDemandMetric := prometheus.NewGauge(prometheus.GaugeOpts{
+		Name: "tusd_s3_upload_semaphore_demand",
+		Help: "Number of goroutines wanting to acquire the upload lock or having it acquired",
+	})
+
+	uploadSemaphoreLimitMetric := prometheus.NewGauge(prometheus.GaugeOpts{
+		Name: "tusd_s3_upload_semaphore_limit",
+		Help: "Limit of concurrent acquisitions of upload semaphore",
+	})
+
+	store := S3Store{
+		Bucket:                      bucket,
+		Service:                     service,
+		MaxPartSize:                 5 * 1024 * 1024 * 1024,
+		MinPartSize:                 5 * 1024 * 1024,
+		PreferredPartSize:           50 * 1024 * 1024,
+		MaxMultipartParts:           10000,
+		MaxObjectSize:               5 * 1024 * 1024 * 1024 * 1024,
+		MaxBufferedParts:            20,
+		TemporaryDirectory:          "",
+		requestDurationMetric:       requestDurationMetric,
+		diskWriteDurationMetric:     diskWriteDurationMetric,
+		uploadSemaphoreDemandMetric: uploadSemaphoreDemandMetric,
+		uploadSemaphoreLimitMetric:  uploadSemaphoreLimitMetric,
 	}
+
+	store.SetConcurrentPartUploads(10)
+	return store
+}
+
+// SetConcurrentPartUploads changes the limit on how many concurrent part uploads to S3 are allowed.
+func (store *S3Store) SetConcurrentPartUploads(limit int) {
+	store.uploadSemaphore = semaphore.New(limit)
+	store.uploadSemaphoreLimitMetric.Set(float64(limit))
 }
 
 // UseIn sets this store as the core data store in the passed composer and adds
@@ -199,6 +267,20 @@ func (store S3Store) UseIn(composer *handler.StoreComposer) {
 	composer.UseLengthDeferrer(store)
 }
 
+func (store S3Store) RegisterMetrics(registry prometheus.Registerer) {
+	registry.MustRegister(store.requestDurationMetric)
+	registry.MustRegister(store.diskWriteDurationMetric)
+	registry.MustRegister(store.uploadSemaphoreDemandMetric)
+	registry.MustRegister(store.uploadSemaphoreLimitMetric)
+}
+
+func (store S3Store) observeRequestDuration(start time.Time, label string) {
+	elapsed := time.Now().Sub(start)
+	ms := float64(elapsed.Nanoseconds() / int64(time.Millisecond))
+
+	store.requestDurationMetric.WithLabelValues(label).Observe(ms)
+}
+
 type s3Upload struct {
 	id    string
 	store *S3Store
@@ -207,6 +289,18 @@ type s3Upload struct {
 	// been fetched yet from S3. Never read or write to it directly but instead use
 	// the GetInfo and writeInfo functions.
 	info *handler.FileInfo
+
+	// parts collects all parts for this upload. It will be nil if info is nil as well.
+	parts []*s3Part
+	// incompletePartSize is the size of an incomplete part object, if one exists. It will be 0 if info is nil as well.
+	incompletePartSize int64
+}
+
+// s3Part represents a single part of a S3 multipart upload.
+type s3Part struct {
+	number int64
+	size   int64
+	etag   string
 }
 
 func (store S3Store) NewUpload(ctx context.Context, info handler.FileInfo) (handler.Upload, error) {
@@ -233,11 +327,13 @@ func (store S3Store) NewUpload(ctx context.Context, info handler.FileInfo) (hand
 	}
 
 	// Create the actual multipart upload
+	t := time.Now()
 	res, err := store.Service.CreateMultipartUploadWithContext(ctx, &s3.CreateMultipartUploadInput{
 		Bucket:   aws.String(store.Bucket),
 		Key:      store.keyWithPrefix(uploadId),
 		Metadata: metadata,
 	})
+	store.observeRequestDuration(t, metricCreateMultipartUpload)
 	if err != nil {
 		return nil, fmt.Errorf("s3store: unable to create multipart upload:\n%s", err)
 	}
@@ -251,7 +347,7 @@ func (store S3Store) NewUpload(ctx context.Context, info handler.FileInfo) (hand
 		"Key":    *store.keyWithPrefix(uploadId),
 	}
 
-	upload := &s3Upload{id, &store, nil}
+	upload := &s3Upload{id, &store, nil, []*s3Part{}, 0}
 	err = upload.writeInfo(ctx, info)
 	if err != nil {
 		return nil, fmt.Errorf("s3store: unable to create info file:\n%s", err)
@@ -261,7 +357,7 @@ func (store S3Store) NewUpload(ctx context.Context, info handler.FileInfo) (hand
 }
 
 func (store S3Store) GetUpload(ctx context.Context, id string) (handler.Upload, error) {
-	return &s3Upload{id, &store, nil}, nil
+	return &s3Upload{id, &store, nil, []*s3Part{}, 0}, nil
 }
 
 func (store S3Store) AsTerminatableUpload(upload handler.Upload) handler.TerminatableUpload {
@@ -290,24 +386,72 @@ func (upload *s3Upload) writeInfo(ctx context.Context, info handler.FileInfo) er
 	}
 
 	// Create object on S3 containing information about the file
+	t := time.Now()
 	_, err = store.Service.PutObjectWithContext(ctx, &s3.PutObjectInput{
 		Bucket:        aws.String(store.Bucket),
 		Key:           store.metadataKeyWithPrefix(uploadId + ".info"),
 		Body:          bytes.NewReader(infoJson),
 		ContentLength: aws.Int64(int64(len(infoJson))),
 	})
+	store.observeRequestDuration(t, metricPutInfoObject)
 
 	return err
 }
 
-func (upload s3Upload) WriteChunk(ctx context.Context, offset int64, src io.Reader) (int64, error) {
+func (upload *s3Upload) WriteChunk(ctx context.Context, offset int64, src io.Reader) (int64, error) {
+	id := upload.id
+	store := upload.store
+
+	uploadId, _ := splitIds(id)
+
+	// Get the total size of the current upload, number of parts to generate next number and whether
+	// an incomplete part exists
+	_, _, incompletePartSize, err := upload.getInternalInfo(ctx)
+	if err != nil {
+		return 0, err
+	}
+
+	if incompletePartSize > 0 {
+		incompletePartFile, err := store.downloadIncompletePartForUpload(ctx, uploadId)
+		if err != nil {
+			return 0, err
+		}
+		if incompletePartFile == nil {
+			return 0, fmt.Errorf("s3store: Expected an incomplete part file but did not get any")
+		}
+		defer cleanUpTempFile(incompletePartFile)
+
+		if err := store.deleteIncompletePartForUpload(ctx, uploadId); err != nil {
+			return 0, err
+		}
+
+		// Prepend an incomplete part, if necessary and adapt the offset
+		src = io.MultiReader(incompletePartFile, src)
+		offset = offset - incompletePartSize
+	}
+
+	bytesUploaded, err := upload.uploadParts(ctx, offset, src)
+
+	// The size of the incomplete part should not be counted, because the
+	// process of the incomplete part should be fully transparent to the user.
+	bytesUploaded = bytesUploaded - incompletePartSize
+	if bytesUploaded < 0 {
+		bytesUploaded = 0
+	}
+
+	upload.info.Offset += bytesUploaded
+
+	return bytesUploaded, err
+}
+
+func (upload *s3Upload) uploadParts(ctx context.Context, offset int64, src io.Reader) (int64, error) {
 	id := upload.id
 	store := upload.store
 
 	uploadId, multipartId := splitIds(id)
 
-	// Get the total size of the current upload
-	info, err := upload.GetInfo(ctx)
+	// Get the total size of the current upload and number of parts to generate next number
+	info, parts, _, err := upload.getInternalInfo(ctx)
 	if err != nil {
 		return 0, err
 	}
@@ -319,83 +463,87 @@ func (upload s3Upload) WriteChunk(ctx context.Context, offset int64, src io.Read
 		return 0, err
 	}
 
-	// Get number of parts to generate next number
-	parts, err := store.listAllParts(ctx, id)
-	if err != nil {
-		return 0, err
-	}
-
 	numParts := len(parts)
 	nextPartNum := int64(numParts + 1)
 
-	incompletePartFile, incompletePartSize, err := store.downloadIncompletePartForUpload(ctx, uploadId)
-	if err != nil {
-		return 0, err
-	}
-	if incompletePartFile != nil {
-		defer cleanUpTempFile(incompletePartFile)
-
-		if err := store.deleteIncompletePartForUpload(ctx, uploadId); err != nil {
-			return 0, err
-		}
-
-		src = io.MultiReader(incompletePartFile, src)
-	}
-
-	fileChan := make(chan *os.File, store.MaxBufferedParts)
-	doneChan := make(chan struct{})
-	defer close(doneChan)
-
-	// If we panic or return while there are still files in the channel, then
-	// we may leak file descriptors. Let's ensure that those are cleaned up.
-	defer func() {
-		for file := range fileChan {
-			cleanUpTempFile(file)
-		}
-	}()
-
-	partProducer := s3PartProducer{
-		store: store,
-		done:  doneChan,
-		files: fileChan,
-		r:     src,
-	}
+	partProducer, fileChan := newS3PartProducer(src, store.MaxBufferedParts, store.TemporaryDirectory, store.diskWriteDurationMetric)
+	defer partProducer.stop()
 	go partProducer.produce(optimalPartSize)
 
-	for file := range fileChan {
-		stat, err := file.Stat()
-		if err != nil {
-			return 0, err
-		}
-		n := stat.Size()
+	var wg sync.WaitGroup
+	var uploadErr error
 
-		isFinalChunk := !info.SizeIsDeferred && (size == (offset-incompletePartSize)+n)
-		if n >= store.MinPartSize || isFinalChunk {
-			uploadPartInput := &s3.UploadPartInput{
-				Bucket:     aws.String(store.Bucket),
-				Key:        store.keyWithPrefix(uploadId),
-				UploadId:   aws.String(multipartId),
-				PartNumber: aws.Int64(nextPartNum),
-			}
-			if err := upload.putPartForUpload(ctx, uploadPartInput, file, n); err != nil {
-				return bytesUploaded, err
+	for {
+		// We acquire the semaphore before starting the goroutine to avoid
+		// starting many goroutines, most of which are just waiting for the lock.
+		// We also acquire the semaphore before reading from the channel to reduce
+		// the number of part files are laying around on disk without being used.
+		upload.store.acquireUploadSemaphore()
+		fileChunk, more := <-fileChan
+		if !more {
+			upload.store.releaseUploadSemaphore()
+			break
+		}
+
+		partfile := fileChunk.reader
+		partsize := fileChunk.size
+		closePart := fileChunk.closeReader
+
+		isFinalChunk := !info.SizeIsDeferred && (size == offset+bytesUploaded+partsize)
+		if partsize >= store.MinPartSize || isFinalChunk {
+			part := &s3Part{
+				etag:   "",
+				size:   partsize,
+				number: nextPartNum,
 			}
+			upload.parts = append(upload.parts, part)
+
+			wg.Add(1)
+			go func(file io.ReadSeeker, part *s3Part, closePart func()) {
+				defer upload.store.releaseUploadSemaphore()
+				defer wg.Done()
+				defer closePart()
+
+				t := time.Now()
+				uploadPartInput := &s3.UploadPartInput{
+					Bucket:     aws.String(store.Bucket),
+					Key:        store.keyWithPrefix(uploadId),
+					UploadId:   aws.String(multipartId),
+					PartNumber: aws.Int64(part.number),
+				}
+				etag, err := upload.putPartForUpload(ctx, uploadPartInput, file, part.size)
+				store.observeRequestDuration(t, metricUploadPart)
+				if err != nil {
+					uploadErr = err
+				} else {
+					part.etag = etag
+				}
+			}(partfile, part, closePart)
 		} else {
-			if err := store.putIncompletePartForUpload(ctx, uploadId, file); err != nil {
-				return bytesUploaded, err
-			}
+			wg.Add(1)
+			go func(file io.ReadSeeker, closePart func()) {
+				defer upload.store.releaseUploadSemaphore()
+				defer wg.Done()
+				defer closePart()
 
-			bytesUploaded += n
-
-			return (bytesUploaded - incompletePartSize), nil
+				if err := store.putIncompletePartForUpload(ctx, uploadId, file); err != nil {
+					uploadErr = err
+				}
+				upload.incompletePartSize = partsize
+			}(partfile, closePart)
 		}
 
-		offset += n
-		bytesUploaded += n
+		bytesUploaded += partsize
 		nextPartNum += 1
 	}
 
-	return bytesUploaded - incompletePartSize, partProducer.err
+	wg.Wait()
+
+	if uploadErr != nil {
+		return 0, uploadErr
+	}
+
+	return bytesUploaded, partProducer.err
 }
 
 func cleanUpTempFile(file *os.File) {
@@ -403,14 +551,16 @@ func cleanUpTempFile(file *os.File) {
 	os.Remove(file.Name())
 }
 
-func (upload *s3Upload) putPartForUpload(ctx context.Context, uploadPartInput *s3.UploadPartInput, file *os.File, size int64) error {
-	defer cleanUpTempFile(file)
-
+func (upload *s3Upload) putPartForUpload(ctx context.Context, uploadPartInput *s3.UploadPartInput, file io.ReadSeeker, size int64) (string, error) {
 	if !upload.store.DisableContentHashes {
 		// By default, use the traditional approach to upload data
 		uploadPartInput.Body = file
-		_, err := upload.store.Service.UploadPartWithContext(ctx, uploadPartInput)
-		return err
+		uploadPartInput.ContentLength = &size
+		res, err := upload.store.Service.UploadPartWithContext(ctx, uploadPartInput)
+		if err != nil {
+			return "", err
+		}
+		return *res.ETag, nil
 	} else {
 		// Experimental feature to prevent the AWS SDK from calculating the SHA256 hash
 		// for the parts we upload to S3.
@@ -418,19 +568,19 @@ func (upload *s3Upload) putPartForUpload(ctx context.Context, uploadPartInput *s
 		// on our own. This way, the body is not included in the SHA256 calculation.
 		s3api, ok := upload.store.Service.(s3APIForPresigning)
 		if !ok {
-			return fmt.Errorf("s3store: failed to cast S3 service for presigning")
+			return "", fmt.Errorf("s3store: failed to cast S3 service for presigning")
 		}
 
 		s3Req, _ := s3api.UploadPartRequest(uploadPartInput)
 
 		url, err := s3Req.Presign(15 * time.Minute)
 		if err != nil {
-			return err
+			return "", err
 		}
 
 		req, err := http.NewRequest("PUT", url, file)
 		if err != nil {
-			return err
+			return "", err
 		}
 
 		// Set the Content-Length manually to prevent the usage of Transfer-Encoding: chunked,
@@ -439,60 +589,100 @@ func (upload *s3Upload) putPartForUpload(ctx context.Context, uploadPartInput *s
 
 		res, err := http.DefaultClient.Do(req)
 		if err != nil {
-			return err
+			return "", err
 		}
 		defer res.Body.Close()
 
 		if res.StatusCode != 200 {
 			buf := new(strings.Builder)
 			io.Copy(buf, res.Body)
-			return fmt.Errorf("s3store: unexpected response code %d for presigned upload: %s", res.StatusCode, buf.String())
+			return "", fmt.Errorf("s3store: unexpected response code %d for presigned upload: %s", res.StatusCode, buf.String())
 		}
 
-		return nil
+		return res.Header.Get("ETag"), nil
 	}
 }
 
 func (upload *s3Upload) GetInfo(ctx context.Context) (info handler.FileInfo, err error) {
+	info, _, _, err = upload.getInternalInfo(ctx)
+	return info, err
+}
+
+func (upload *s3Upload) getInternalInfo(ctx context.Context) (info handler.FileInfo, parts []*s3Part, incompletePartSize int64, err error) {
 	if upload.info != nil {
-		return *upload.info, nil
+		return *upload.info, upload.parts, upload.incompletePartSize, nil
 	}
 
-	info, err = upload.fetchInfo(ctx)
+	info, parts, incompletePartSize, err = upload.fetchInfo(ctx)
 	if err != nil {
-		return info, err
+		return info, parts, incompletePartSize, err
 	}
 
 	upload.info = &info
-	return info, nil
+	upload.parts = parts
+	upload.incompletePartSize = incompletePartSize
+	return info, parts, incompletePartSize, nil
 }
 
-func (upload s3Upload) fetchInfo(ctx context.Context) (info handler.FileInfo, err error) {
+func (upload s3Upload) fetchInfo(ctx context.Context) (info handler.FileInfo, parts []*s3Part, incompletePartSize int64, err error) {
 	id := upload.id
 	store := upload.store
 	uploadId, _ := splitIds(id)
 
-	// Get file info stored in separate object
-	res, err := store.Service.GetObjectWithContext(ctx, &s3.GetObjectInput{
-		Bucket: aws.String(store.Bucket),
-		Key:    store.metadataKeyWithPrefix(uploadId + ".info"),
-	})
-	if err != nil {
-		if isAwsError(err, "NoSuchKey") {
-			return info, handler.ErrNotFound
+	var wg sync.WaitGroup
+	wg.Add(3)
+
+	// We store all errors in here and handle them all together once the wait
+	// group is done.
+	var infoErr error
+	var partsErr error
+	var incompletePartSizeErr error
+
+	go func() {
+		defer wg.Done()
+		t := time.Now()
+
+		// Get file info stored in separate object
+		var res *s3.GetObjectOutput
+		res, infoErr = store.Service.GetObjectWithContext(ctx, &s3.GetObjectInput{
+			Bucket: aws.String(store.Bucket),
+			Key:    store.metadataKeyWithPrefix(uploadId + ".info"),
+		})
+		store.observeRequestDuration(t, metricGetInfoObject)
+		if infoErr == nil {
+			infoErr = json.NewDecoder(res.Body).Decode(&info)
 		}
+	}()
 
-		return info, err
+	go func() {
+		defer wg.Done()
+
+		// Get uploaded parts and their offset
+		parts, partsErr = store.listAllParts(ctx, id)
+	}()
+
+	go func() {
+		defer wg.Done()
+
+		// Get size of optional incomplete part file.
+		incompletePartSize, incompletePartSizeErr = store.headIncompletePartForUpload(ctx, uploadId)
+	}()
+
+	wg.Wait()
+
+	// Finally, after all requests are complete, let's handle the errors
+	if infoErr != nil {
+		err = infoErr
+		// If the info file is not found, we consider the upload to be non-existant
+		if isAwsError(err, "NoSuchKey") {
+			err = handler.ErrNotFound
+		}
+		return
 	}
 
-	if err := json.NewDecoder(res.Body).Decode(&info); err != nil {
-		return info, err
-	}
-
-	// Get uploaded parts and their offset
-	parts, err := store.listAllParts(ctx, id)
-	if err != nil {
-		// Check if the error is caused by the upload not being found. This happens
+	if partsErr != nil {
+		err = partsErr
+		// Check if the error is caused by the multipart upload not being found. This happens
 		// when the multipart upload has already been completed or aborted. Since
 		// we already found the info object, we know that the upload has been
 		// completed and therefore can ensure the the offset is the size.
@@ -500,33 +690,28 @@ func (upload s3Upload) fetchInfo(ctx context.Context) (info handler.FileInfo, er
 		// Spaces, can also return NoSuchKey.
 		if isAwsError(err, "NoSuchUpload") || isAwsError(err, "NoSuchKey") {
 			info.Offset = info.Size
-			return info, nil
-		} else {
-			return info, err
+			err = nil
 		}
+		return
 	}
 
-	offset := int64(0)
+	if incompletePartSizeErr != nil {
+		err = incompletePartSizeErr
+		return
+	}
 
+	// The offset is the sum of all part sizes and the size of the incomplete part file.
+	offset := incompletePartSize
 	for _, part := range parts {
-		offset += *part.Size
-	}
-
-	incompletePartObject, err := store.getIncompletePartForUpload(ctx, uploadId)
-	if err != nil {
-		return info, err
-	}
-	if incompletePartObject != nil {
-		defer incompletePartObject.Body.Close()
-		offset += *incompletePartObject.ContentLength
+		offset += part.size
 	}
 
 	info.Offset = offset
 
-	return
+	return info, parts, incompletePartSize, nil
 }
 
-func (upload s3Upload) GetReader(ctx context.Context) (io.Reader, error) {
+func (upload s3Upload) GetReader(ctx context.Context) (io.ReadCloser, error) {
 	id := upload.id
 	store := upload.store
 	uploadId, multipartId := splitIds(id)
@@ -558,7 +743,7 @@ func (upload s3Upload) GetReader(ctx context.Context) (io.Reader, error) {
 	})
 	if err == nil {
 		// The multipart upload still exists, which means we cannot download it yet
-		return nil, handler.NewHTTPError(errors.New("cannot stream non-finished upload"), http.StatusBadRequest)
+		return nil, handler.NewError("ERR_INCOMPLETE_UPLOAD", "cannot stream non-finished upload", http.StatusBadRequest)
 	}
 
 	if isAwsError(err, "NoSuchUpload") {
@@ -640,7 +825,7 @@ func (upload s3Upload) FinishUpload(ctx context.Context) error {
 	uploadId, multipartId := splitIds(id)
 
 	// Get uploaded parts
-	parts, err := store.listAllParts(ctx, id)
+	_, parts, _, err := upload.getInternalInfo(ctx)
 	if err != nil {
 		return err
 	}
@@ -660,10 +845,11 @@ func (upload s3Upload) FinishUpload(ctx context.Context) error {
 			return err
 		}
 
-		parts = []*s3.Part{
-			&s3.Part{
-				ETag:       res.ETag,
-				PartNumber: aws.Int64(1),
+		parts = []*s3Part{
+			&s3Part{
+				etag:   *res.ETag,
+				number: 1,
+				size:   0,
 			},
 		}
 
@@ -675,11 +861,12 @@ func (upload s3Upload) FinishUpload(ctx context.Context) error {
 
 	for index, part := range parts {
 		completedParts[index] = &s3.CompletedPart{
-			ETag:       part.ETag,
-			PartNumber: part.PartNumber,
+			ETag:       aws.String(part.etag),
+			PartNumber: aws.Int64(part.number),
 		}
 	}
 
+	t := time.Now()
 	_, err = store.Service.CompleteMultipartUploadWithContext(ctx, &s3.CompleteMultipartUploadInput{
 		Bucket:   aws.String(store.Bucket),
 		Key:      store.keyWithPrefix(uploadId),
@@ -688,6 +875,7 @@ func (upload s3Upload) FinishUpload(ctx context.Context) error {
 			Parts: completedParts,
 		},
 	})
+	store.observeRequestDuration(t, metricCompleteMultipartUpload)
 
 	return err
 }
@@ -790,10 +978,16 @@ func (upload *s3Upload) concatUsingMultipart(ctx context.Context, partialUploads
 		partialS3Upload := partialUpload.(*s3Upload)
 		partialId, _ := splitIds(partialS3Upload.id)
 
+		upload.parts = append(upload.parts, &s3Part{
+			number: int64(i + 1),
+			size:   -1,
+			etag:   "",
+		})
+
 		go func(i int, partialId string) {
 			defer wg.Done()
 
-			_, err := store.Service.UploadPartCopyWithContext(ctx, &s3.UploadPartCopyInput{
+			res, err := store.Service.UploadPartCopyWithContext(ctx, &s3.UploadPartCopyInput{
 				Bucket:   aws.String(store.Bucket),
 				Key:      store.keyWithPrefix(uploadId),
 				UploadId: aws.String(multipartId),
@@ -806,6 +1000,8 @@ func (upload *s3Upload) concatUsingMultipart(ctx context.Context, partialUploads
 				errs = append(errs, err)
 				return
 			}
+
+			upload.parts[i].etag = *res.CopyPartResult.ETag
 		}(i, partialId)
 	}
 
@@ -829,11 +1025,13 @@ func (upload *s3Upload) DeclareLength(ctx context.Context, length int64) error {
 	return upload.writeInfo(ctx, info)
 }
 
-func (store S3Store) listAllParts(ctx context.Context, id string) (parts []*s3.Part, err error) {
+func (store S3Store) listAllParts(ctx context.Context, id string) (parts []*s3Part, err error) {
 	uploadId, multipartId := splitIds(id)
 
 	partMarker := int64(0)
 	for {
+		t := time.Now()
+
 		// Get uploaded parts
 		listPtr, err := store.Service.ListPartsWithContext(ctx, &s3.ListPartsInput{
 			Bucket:           aws.String(store.Bucket),
@@ -841,11 +1039,19 @@ func (store S3Store) listAllParts(ctx context.Context, id string) (parts []*s3.P
 			UploadId:         aws.String(multipartId),
 			PartNumberMarker: aws.Int64(partMarker),
 		})
+		store.observeRequestDuration(t, metricListParts)
 		if err != nil {
 			return nil, err
 		}
 
-		parts = append(parts, (*listPtr).Parts...)
+		// TODO: Find more efficient way when appending many elements
+		for _, part := range (*listPtr).Parts {
+			parts = append(parts, &s3Part{
+				number: *part.PartNumber,
+				size:   *part.Size,
+				etag:   *part.ETag,
+			})
+		}
 
 		if listPtr.IsTruncated != nil && *listPtr.IsTruncated {
 			partMarker = *listPtr.NextPartNumberMarker
@@ -856,36 +1062,38 @@ func (store S3Store) listAllParts(ctx context.Context, id string) (parts []*s3.P
 	return parts, nil
 }
 
-func (store S3Store) downloadIncompletePartForUpload(ctx context.Context, uploadId string) (*os.File, int64, error) {
+func (store S3Store) downloadIncompletePartForUpload(ctx context.Context, uploadId string) (*os.File, error) {
+	t := time.Now()
 	incompleteUploadObject, err := store.getIncompletePartForUpload(ctx, uploadId)
 	if err != nil {
-		return nil, 0, err
+		return nil, err
 	}
 	if incompleteUploadObject == nil {
 		// We did not find an incomplete upload
-		return nil, 0, nil
+		return nil, nil
 	}
 	defer incompleteUploadObject.Body.Close()
 
 	partFile, err := ioutil.TempFile(store.TemporaryDirectory, "tusd-s3-tmp-")
 	if err != nil {
-		return nil, 0, err
+		return nil, err
 	}
 
 	n, err := io.Copy(partFile, incompleteUploadObject.Body)
+	store.observeRequestDuration(t, metricGetPartObject)
 	if err != nil {
-		return nil, 0, err
+		return nil, err
 	}
 	if n < *incompleteUploadObject.ContentLength {
-		return nil, 0, errors.New("short read of incomplete upload")
+		return nil, errors.New("short read of incomplete upload")
 	}
 
 	_, err = partFile.Seek(0, 0)
 	if err != nil {
-		return nil, 0, err
+		return nil, err
 	}
 
-	return partFile, n, nil
+	return partFile, nil
 }
 
 func (store S3Store) getIncompletePartForUpload(ctx context.Context, uploadId string) (*s3.GetObjectOutput, error) {
@@ -901,22 +1109,42 @@ func (store S3Store) getIncompletePartForUpload(ctx context.Context, uploadId st
 	return obj, err
 }
 
-func (store S3Store) putIncompletePartForUpload(ctx context.Context, uploadId string, file *os.File) error {
-	defer cleanUpTempFile(file)
+func (store S3Store) headIncompletePartForUpload(ctx context.Context, uploadId string) (int64, error) {
+	t := time.Now()
+	obj, err := store.Service.HeadObjectWithContext(ctx, &s3.HeadObjectInput{
+		Bucket: aws.String(store.Bucket),
+		Key:    store.metadataKeyWithPrefix(uploadId + ".part"),
+	})
+	store.observeRequestDuration(t, metricHeadPartObject)
 
+	if err != nil {
+		if isAwsError(err, s3.ErrCodeNoSuchKey) || isAwsError(err, "NotFound") || isAwsError(err, "AccessDenied") {
+			err = nil
+		}
+		return 0, err
+	}
+
+	return *obj.ContentLength, nil
+}
+
+func (store S3Store) putIncompletePartForUpload(ctx context.Context, uploadId string, file io.ReadSeeker) error {
+	t := time.Now()
 	_, err := store.Service.PutObjectWithContext(ctx, &s3.PutObjectInput{
 		Bucket: aws.String(store.Bucket),
 		Key:    store.metadataKeyWithPrefix(uploadId + ".part"),
 		Body:   file,
 	})
+	store.observeRequestDuration(t, metricPutPartObject)
 	return err
 }
 
 func (store S3Store) deleteIncompletePartForUpload(ctx context.Context, uploadId string) error {
+	t := time.Now()
 	_, err := store.Service.DeleteObjectWithContext(ctx, &s3.DeleteObjectInput{
 		Bucket: aws.String(store.Bucket),
 		Key:    store.metadataKeyWithPrefix(uploadId + ".part"),
 	})
+	store.observeRequestDuration(t, metricPutPartObject)
 	return err
 }
 
@@ -937,6 +1165,11 @@ func isAwsError(err error, code string) bool {
 	if err, ok := err.(awserr.Error); ok && err.Code() == code {
 		return true
 	}
+
+	if err, ok := err.(minio.ErrorResponse); ok && err.Code == code {
+		return true
+	}
+
 	return false
 }
 
@@ -1004,3 +1237,13 @@ func (store S3Store) metadataKeyWithPrefix(key string) *string {
 
 	return aws.String(prefix + key)
 }
+
+func (store S3Store) acquireUploadSemaphore() {
+	store.uploadSemaphoreDemandMetric.Inc()
+	store.uploadSemaphore.Acquire()
+}
+
+func (store S3Store) releaseUploadSemaphore() {
+	store.uploadSemaphore.Release()
+	store.uploadSemaphoreDemandMetric.Dec()
+}

pkg/s3store/s3store_mock_test.go

@@ -6,36 +6,37 @@ package s3store
 
 import (
 	context "context"
+	reflect "reflect"
+
 	request "github.com/aws/aws-sdk-go/aws/request"
 	s3 "github.com/aws/aws-sdk-go/service/s3"
 	gomock "github.com/golang/mock/gomock"
-	reflect "reflect"
 )
 
-// MockS3API is a mock of S3API interface
+// MockS3API is a mock of S3API interface.
 type MockS3API struct {
 	ctrl     *gomock.Controller
 	recorder *MockS3APIMockRecorder
 }
 
-// MockS3APIMockRecorder is the mock recorder for MockS3API
+// MockS3APIMockRecorder is the mock recorder for MockS3API.
 type MockS3APIMockRecorder struct {
 	mock *MockS3API
 }
 
-// NewMockS3API creates a new mock instance
+// NewMockS3API creates a new mock instance.
 func NewMockS3API(ctrl *gomock.Controller) *MockS3API {
 	mock := &MockS3API{ctrl: ctrl}
 	mock.recorder = &MockS3APIMockRecorder{mock}
 	return mock
 }
 
-// EXPECT returns an object that allows the caller to indicate expected use
+// EXPECT returns an object that allows the caller to indicate expected use.
 func (m *MockS3API) EXPECT() *MockS3APIMockRecorder {
 	return m.recorder
 }
 
-// AbortMultipartUploadWithContext mocks base method
+// AbortMultipartUploadWithContext mocks base method.
 func (m *MockS3API) AbortMultipartUploadWithContext(arg0 context.Context, arg1 *s3.AbortMultipartUploadInput, arg2 ...request.Option) (*s3.AbortMultipartUploadOutput, error) {
 	m.ctrl.T.Helper()
 	varargs := []interface{}{arg0, arg1}
@@ -48,14 +49,14 @@ func (m *MockS3API) AbortMultipartUploadWithContext(arg0 context.Context, arg1 *
 	return ret0, ret1
 }
 
-// AbortMultipartUploadWithContext indicates an expected call of AbortMultipartUploadWithContext
+// AbortMultipartUploadWithContext indicates an expected call of AbortMultipartUploadWithContext.
 func (mr *MockS3APIMockRecorder) AbortMultipartUploadWithContext(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	varargs := append([]interface{}{arg0, arg1}, arg2...)
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "AbortMultipartUploadWithContext", reflect.TypeOf((*MockS3API)(nil).AbortMultipartUploadWithContext), varargs...)
 }
 
-// CompleteMultipartUploadWithContext mocks base method
+// CompleteMultipartUploadWithContext mocks base method.
 func (m *MockS3API) CompleteMultipartUploadWithContext(arg0 context.Context, arg1 *s3.CompleteMultipartUploadInput, arg2 ...request.Option) (*s3.CompleteMultipartUploadOutput, error) {
 	m.ctrl.T.Helper()
 	varargs := []interface{}{arg0, arg1}
@@ -68,14 +69,14 @@ func (m *MockS3API) CompleteMultipartUploadWithContext(arg0 context.Context, arg
 	return ret0, ret1
 }
 
-// CompleteMultipartUploadWithContext indicates an expected call of CompleteMultipartUploadWithContext
+// CompleteMultipartUploadWithContext indicates an expected call of CompleteMultipartUploadWithContext.
 func (mr *MockS3APIMockRecorder) CompleteMultipartUploadWithContext(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	varargs := append([]interface{}{arg0, arg1}, arg2...)
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CompleteMultipartUploadWithContext", reflect.TypeOf((*MockS3API)(nil).CompleteMultipartUploadWithContext), varargs...)
 }
 
-// CreateMultipartUploadWithContext mocks base method
+// CreateMultipartUploadWithContext mocks base method.
 func (m *MockS3API) CreateMultipartUploadWithContext(arg0 context.Context, arg1 *s3.CreateMultipartUploadInput, arg2 ...request.Option) (*s3.CreateMultipartUploadOutput, error) {
 	m.ctrl.T.Helper()
 	varargs := []interface{}{arg0, arg1}
@@ -88,14 +89,14 @@ func (m *MockS3API) CreateMultipartUploadWithContext(arg0 context.Context, arg1
 	return ret0, ret1
 }
 
-// CreateMultipartUploadWithContext indicates an expected call of CreateMultipartUploadWithContext
+// CreateMultipartUploadWithContext indicates an expected call of CreateMultipartUploadWithContext.
 func (mr *MockS3APIMockRecorder) CreateMultipartUploadWithContext(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	varargs := append([]interface{}{arg0, arg1}, arg2...)
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "CreateMultipartUploadWithContext", reflect.TypeOf((*MockS3API)(nil).CreateMultipartUploadWithContext), varargs...)
 }
 
-// DeleteObjectWithContext mocks base method
+// DeleteObjectWithContext mocks base method.
 func (m *MockS3API) DeleteObjectWithContext(arg0 context.Context, arg1 *s3.DeleteObjectInput, arg2 ...request.Option) (*s3.DeleteObjectOutput, error) {
 	m.ctrl.T.Helper()
 	varargs := []interface{}{arg0, arg1}
@@ -108,14 +109,14 @@ func (m *MockS3API) DeleteObjectWithContext(arg0 context.Context, arg1 *s3.Delet
 	return ret0, ret1
 }
 
-// DeleteObjectWithContext indicates an expected call of DeleteObjectWithContext
+// DeleteObjectWithContext indicates an expected call of DeleteObjectWithContext.
 func (mr *MockS3APIMockRecorder) DeleteObjectWithContext(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	varargs := append([]interface{}{arg0, arg1}, arg2...)
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "DeleteObjectWithContext", reflect.TypeOf((*MockS3API)(nil).DeleteObjectWithContext), varargs...)
 }
 
-// DeleteObjectsWithContext mocks base method
+// DeleteObjectsWithContext mocks base method.
 func (m *MockS3API) DeleteObjectsWithContext(arg0 context.Context, arg1 *s3.DeleteObjectsInput, arg2 ...request.Option) (*s3.DeleteObjectsOutput, error) {
 	m.ctrl.T.Helper()
 	varargs := []interface{}{arg0, arg1}
@@ -128,14 +129,14 @@ func (m *MockS3API) DeleteObjectsWithContext(arg0 context.Context, arg1 *s3.Dele
 	return ret0, ret1
 }
 
-// DeleteObjectsWithContext indicates an expected call of DeleteObjectsWithContext
+// DeleteObjectsWithContext indicates an expected call of DeleteObjectsWithContext.
 func (mr *MockS3APIMockRecorder) DeleteObjectsWithContext(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	varargs := append([]interface{}{arg0, arg1}, arg2...)
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "DeleteObjectsWithContext", reflect.TypeOf((*MockS3API)(nil).DeleteObjectsWithContext), varargs...)
 }
 
-// GetObjectWithContext mocks base method
+// GetObjectWithContext mocks base method.
 func (m *MockS3API) GetObjectWithContext(arg0 context.Context, arg1 *s3.GetObjectInput, arg2 ...request.Option) (*s3.GetObjectOutput, error) {
 	m.ctrl.T.Helper()
 	varargs := []interface{}{arg0, arg1}
@@ -148,14 +149,34 @@ func (m *MockS3API) GetObjectWithContext(arg0 context.Context, arg1 *s3.GetObjec
 	return ret0, ret1
 }
 
-// GetObjectWithContext indicates an expected call of GetObjectWithContext
+// GetObjectWithContext indicates an expected call of GetObjectWithContext.
 func (mr *MockS3APIMockRecorder) GetObjectWithContext(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	varargs := append([]interface{}{arg0, arg1}, arg2...)
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetObjectWithContext", reflect.TypeOf((*MockS3API)(nil).GetObjectWithContext), varargs...)
 }
 
-// ListPartsWithContext mocks base method
+// HeadObjectWithContext mocks base method.
+func (m *MockS3API) HeadObjectWithContext(arg0 context.Context, arg1 *s3.HeadObjectInput, arg2 ...request.Option) (*s3.HeadObjectOutput, error) {
+	m.ctrl.T.Helper()
+	varargs := []interface{}{arg0, arg1}
+	for _, a := range arg2 {
+		varargs = append(varargs, a)
+	}
+	ret := m.ctrl.Call(m, "HeadObjectWithContext", varargs...)
+	ret0, _ := ret[0].(*s3.HeadObjectOutput)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
+}
+
+// HeadObjectWithContext indicates an expected call of HeadObjectWithContext.
+func (mr *MockS3APIMockRecorder) HeadObjectWithContext(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
+	mr.mock.ctrl.T.Helper()
+	varargs := append([]interface{}{arg0, arg1}, arg2...)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "HeadObjectWithContext", reflect.TypeOf((*MockS3API)(nil).HeadObjectWithContext), varargs...)
+}
+
+// ListPartsWithContext mocks base method.
 func (m *MockS3API) ListPartsWithContext(arg0 context.Context, arg1 *s3.ListPartsInput, arg2 ...request.Option) (*s3.ListPartsOutput, error) {
 	m.ctrl.T.Helper()
 	varargs := []interface{}{arg0, arg1}
@@ -168,14 +189,14 @@ func (m *MockS3API) ListPartsWithContext(arg0 context.Context, arg1 *s3.ListPart
 	return ret0, ret1
 }
 
-// ListPartsWithContext indicates an expected call of ListPartsWithContext
+// ListPartsWithContext indicates an expected call of ListPartsWithContext.
 func (mr *MockS3APIMockRecorder) ListPartsWithContext(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	varargs := append([]interface{}{arg0, arg1}, arg2...)
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "ListPartsWithContext", reflect.TypeOf((*MockS3API)(nil).ListPartsWithContext), varargs...)
 }
 
-// PutObjectWithContext mocks base method
+// PutObjectWithContext mocks base method.
 func (m *MockS3API) PutObjectWithContext(arg0 context.Context, arg1 *s3.PutObjectInput, arg2 ...request.Option) (*s3.PutObjectOutput, error) {
 	m.ctrl.T.Helper()
 	varargs := []interface{}{arg0, arg1}
@@ -188,14 +209,14 @@ func (m *MockS3API) PutObjectWithContext(arg0 context.Context, arg1 *s3.PutObjec
 	return ret0, ret1
 }
 
-// PutObjectWithContext indicates an expected call of PutObjectWithContext
+// PutObjectWithContext indicates an expected call of PutObjectWithContext.
 func (mr *MockS3APIMockRecorder) PutObjectWithContext(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	varargs := append([]interface{}{arg0, arg1}, arg2...)
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "PutObjectWithContext", reflect.TypeOf((*MockS3API)(nil).PutObjectWithContext), varargs...)
 }
 
-// UploadPartCopyWithContext mocks base method
+// UploadPartCopyWithContext mocks base method.
 func (m *MockS3API) UploadPartCopyWithContext(arg0 context.Context, arg1 *s3.UploadPartCopyInput, arg2 ...request.Option) (*s3.UploadPartCopyOutput, error) {
 	m.ctrl.T.Helper()
 	varargs := []interface{}{arg0, arg1}
@@ -208,14 +229,14 @@ func (m *MockS3API) UploadPartCopyWithContext(arg0 context.Context, arg1 *s3.Upl
 	return ret0, ret1
 }
 
-// UploadPartCopyWithContext indicates an expected call of UploadPartCopyWithContext
+// UploadPartCopyWithContext indicates an expected call of UploadPartCopyWithContext.
 func (mr *MockS3APIMockRecorder) UploadPartCopyWithContext(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	varargs := append([]interface{}{arg0, arg1}, arg2...)
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "UploadPartCopyWithContext", reflect.TypeOf((*MockS3API)(nil).UploadPartCopyWithContext), varargs...)
 }
 
-// UploadPartWithContext mocks base method
+// UploadPartWithContext mocks base method.
 func (m *MockS3API) UploadPartWithContext(arg0 context.Context, arg1 *s3.UploadPartInput, arg2 ...request.Option) (*s3.UploadPartOutput, error) {
 	m.ctrl.T.Helper()
 	varargs := []interface{}{arg0, arg1}
@@ -228,7 +249,7 @@ func (m *MockS3API) UploadPartWithContext(arg0 context.Context, arg1 *s3.UploadP
 	return ret0, ret1
 }
 
-// UploadPartWithContext indicates an expected call of UploadPartWithContext
+// UploadPartWithContext indicates an expected call of UploadPartWithContext.
 func (mr *MockS3APIMockRecorder) UploadPartWithContext(arg0, arg1 interface{}, arg2 ...interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
 	varargs := append([]interface{}{arg0, arg1}, arg2...)

pkg/s3store/s3store_part_producer.go

@@ -1,64 +1,155 @@
 package s3store
 
 import (
+	"bytes"
 	"io"
 	"io/ioutil"
 	"os"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
 )
 
+const TEMP_DIR_USE_MEMORY = "_memory"
+
 // s3PartProducer converts a stream of bytes from the reader into a stream of files on disk
 type s3PartProducer struct {
-	store *S3Store
-	files chan<- *os.File
-	done  chan struct{}
-	err   error
-	r     io.Reader
+	tmpDir                  string
+	files                   chan fileChunk
+	done                    chan struct{}
+	err                     error
+	r                       io.Reader
+	diskWriteDurationMetric prometheus.Summary
+}
+
+type fileChunk struct {
+	reader      io.ReadSeeker
+	closeReader func()
+	size        int64
+}
+
+func newS3PartProducer(source io.Reader, backlog int64, tmpDir string, diskWriteDurationMetric prometheus.Summary) (s3PartProducer, <-chan fileChunk) {
+	fileChan := make(chan fileChunk, backlog)
+	doneChan := make(chan struct{})
+
+	if os.Getenv("TUSD_S3STORE_TEMP_MEMORY") == "1" {
+		tmpDir = TEMP_DIR_USE_MEMORY
+	}
+
+	partProducer := s3PartProducer{
+		tmpDir:                  tmpDir,
+		done:                    doneChan,
+		files:                   fileChan,
+		r:                       source,
+		diskWriteDurationMetric: diskWriteDurationMetric,
+	}
+
+	return partProducer, fileChan
+}
+
+// stop should always be called by the consumer to ensure that the channels
+// are properly closed and emptied.
+func (spp *s3PartProducer) stop() {
+	close(spp.done)
+
+	// If we return while there are still files in the channel, then
+	// we may leak file descriptors. Let's ensure that those are cleaned up.
+	for fileChunk := range spp.files {
+		fileChunk.closeReader()
+	}
 }
 
 func (spp *s3PartProducer) produce(partSize int64) {
+outerloop:
 	for {
-		file, err := spp.nextPart(partSize)
+		file, ok, err := spp.nextPart(partSize)
 		if err != nil {
+			// An error occured. Stop producing.
 			spp.err = err
-			close(spp.files)
-			return
+			break
 		}
-		if file == nil {
-			close(spp.files)
-			return
+		if !ok {
+			// The source was fully read. Stop producing.
+			break
 		}
 		select {
 		case spp.files <- file:
 		case <-spp.done:
-			close(spp.files)
-			return
+			// We are told to stop producing. Stop producing.
+			break outerloop
 		}
 	}
+
+	close(spp.files)
 }
 
-func (spp *s3PartProducer) nextPart(size int64) (*os.File, error) {
-	// Create a temporary file to store the part
-	file, err := ioutil.TempFile(spp.store.TemporaryDirectory, "tusd-s3-tmp-")
-	if err != nil {
-		return nil, err
+func (spp *s3PartProducer) nextPart(size int64) (fileChunk, bool, error) {
+	if spp.tmpDir != TEMP_DIR_USE_MEMORY {
+		// Create a temporary file to store the part
+		file, err := ioutil.TempFile(spp.tmpDir, "tusd-s3-tmp-")
+		if err != nil {
+			return fileChunk{}, false, err
+		}
+
+		limitedReader := io.LimitReader(spp.r, size)
+		start := time.Now()
+
+		n, err := io.Copy(file, limitedReader)
+		if err != nil {
+			return fileChunk{}, false, err
+		}
+
+		// If the entire request body is read and no more data is available,
+		// io.Copy returns 0 since it is unable to read any bytes. In that
+		// case, we can close the s3PartProducer.
+		if n == 0 {
+			cleanUpTempFile(file)
+			return fileChunk{}, false, nil
+		}
+
+		elapsed := time.Now().Sub(start)
+		ms := float64(elapsed.Nanoseconds() / int64(time.Millisecond))
+		spp.diskWriteDurationMetric.Observe(ms)
+
+		// Seek to the beginning of the file
+		file.Seek(0, 0)
+
+		return fileChunk{
+			reader: file,
+			closeReader: func() {
+				file.Close()
+				os.Remove(file.Name())
+			},
+			size: n,
+		}, true, nil
+	} else {
+		// Create a temporary buffer to store the part
+		buf := new(bytes.Buffer)
+
+		limitedReader := io.LimitReader(spp.r, size)
+		start := time.Now()
+
+		n, err := io.Copy(buf, limitedReader)
+		if err != nil {
+			return fileChunk{}, false, err
+		}
+
+		// If the entire request body is read and no more data is available,
+		// io.Copy returns 0 since it is unable to read any bytes. In that
+		// case, we can close the s3PartProducer.
+		if n == 0 {
+			return fileChunk{}, false, nil
+		}
+
+		elapsed := time.Now().Sub(start)
+		ms := float64(elapsed.Nanoseconds() / int64(time.Millisecond))
+		spp.diskWriteDurationMetric.Observe(ms)
+
+		return fileChunk{
+			// buf does not get written to anymore, so we can turn it into a reader
+			reader:      bytes.NewReader(buf.Bytes()),
+			closeReader: func() {},
+			size:        n,
+		}, true, nil
 	}
-
-	limitedReader := io.LimitReader(spp.r, size)
-	n, err := io.Copy(file, limitedReader)
-	if err != nil {
-		return nil, err
-	}
-
-	// If the entire request body is read and no more data is available,
-	// io.Copy returns 0 since it is unable to read any bytes. In that
-	// case, we can close the s3PartProducer.
-	if n == 0 {
-		cleanUpTempFile(file)
-		return nil, nil
-	}
-
-	// Seek to the beginning of the file
-	file.Seek(0, 0)
-
-	return file, nil
 }

pkg/s3store/s3store_part_producer_test.go

@@ -2,10 +2,11 @@ package s3store
 
 import (
 	"errors"
-	"os"
 	"strings"
 	"testing"
 	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
 )
 
 type InfiniteZeroReader struct{}
@@ -21,33 +22,30 @@ func (ErrorReader) Read(b []byte) (int, error) {
 	return 0, errors.New("error from ErrorReader")
 }
 
+var testSummary = prometheus.NewSummary(prometheus.SummaryOpts{})
+
 func TestPartProducerConsumesEntireReaderWithoutError(t *testing.T) {
-	fileChan := make(chan *os.File)
-	doneChan := make(chan struct{})
 	expectedStr := "test"
 	r := strings.NewReader(expectedStr)
-	pp := s3PartProducer{
-		store: &S3Store{},
-		done:  doneChan,
-		files: fileChan,
-		r:     r,
-	}
+	pp, fileChan := newS3PartProducer(r, 0, "", testSummary)
 	go pp.produce(1)
 
 	actualStr := ""
 	b := make([]byte, 1)
-	for f := range fileChan {
-		n, err := f.Read(b)
+	for chunk := range fileChan {
+		n, err := chunk.reader.Read(b)
 		if err != nil {
 			t.Fatalf("unexpected error: %s", err)
 		}
 		if n != 1 {
 			t.Fatalf("incorrect number of bytes read: wanted %d, got %d", 1, n)
 		}
+		if chunk.size != 1 {
+			t.Fatalf("incorrect number of bytes in struct: wanted %d, got %d", 1, chunk.size)
+		}
 		actualStr += string(b)
 
-		os.Remove(f.Name())
-		f.Close()
+		chunk.closeReader()
 	}
 
 	if actualStr != expectedStr {
@@ -59,15 +57,8 @@ func TestPartProducerConsumesEntireReaderWithoutError(t *testing.T) {
 	}
 }
 
-func TestPartProducerExitsWhenDoneChannelIsClosed(t *testing.T) {
-	fileChan := make(chan *os.File)
-	doneChan := make(chan struct{})
-	pp := s3PartProducer{
-		store: &S3Store{},
-		done:  doneChan,
-		files: fileChan,
-		r:     InfiniteZeroReader{},
-	}
+func TestPartProducerExitsWhenProducerIsStopped(t *testing.T) {
+	pp, fileChan := newS3PartProducer(InfiniteZeroReader{}, 0, "", testSummary)
 
 	completedChan := make(chan struct{})
 	go func() {
@@ -75,35 +66,7 @@ func TestPartProducerExitsWhenDoneChannelIsClosed(t *testing.T) {
 		completedChan <- struct{}{}
 	}()
 
-	close(doneChan)
-
-	select {
-	case <-completedChan:
-		// producer exited cleanly
-	case <-time.After(2 * time.Second):
-		t.Error("timed out waiting for producer to exit")
-	}
-
-	safelyDrainChannelOrFail(fileChan, t)
-}
-
-func TestPartProducerExitsWhenDoneChannelIsClosedBeforeAnyPartIsSent(t *testing.T) {
-	fileChan := make(chan *os.File)
-	doneChan := make(chan struct{})
-	pp := s3PartProducer{
-		store: &S3Store{},
-		done:  doneChan,
-		files: fileChan,
-		r:     InfiniteZeroReader{},
-	}
-
-	close(doneChan)
-
-	completedChan := make(chan struct{})
-	go func() {
-		pp.produce(10)
-		completedChan <- struct{}{}
-	}()
+	pp.stop()
 
 	select {
 	case <-completedChan:
@@ -116,14 +79,7 @@ func TestPartProducerExitsWhenDoneChannelIsClosedBeforeAnyPartIsSent(t *testing.
 }
 
 func TestPartProducerExitsWhenUnableToReadFromFile(t *testing.T) {
-	fileChan := make(chan *os.File)
-	doneChan := make(chan struct{})
-	pp := s3PartProducer{
-		store: &S3Store{},
-		done:  doneChan,
-		files: fileChan,
-		r:     ErrorReader{},
-	}
+	pp, fileChan := newS3PartProducer(ErrorReader{}, 0, "", testSummary)
 
 	completedChan := make(chan struct{})
 	go func() {
@@ -145,12 +101,12 @@ func TestPartProducerExitsWhenUnableToReadFromFile(t *testing.T) {
 	}
 }
 
-func safelyDrainChannelOrFail(c chan *os.File, t *testing.T) {
+func safelyDrainChannelOrFail(c <-chan fileChunk, t *testing.T) {
 	// At this point, we've signaled that the producer should exit, but it may write a few files
 	// into the channel before closing it and exiting. Make sure that we get a nil value
 	// eventually.
 	for i := 0; i < 100; i++ {
-		if f := <-c; f == nil {
+		if _, more := <-c; !more {
 			return
 		}
 	}

pkg/s3store/s3store_test.go

@@ -171,6 +171,9 @@ func TestNewUploadWithMetadataObjectPrefix(t *testing.T) {
 	assert.NotNil(upload)
 }
 
+// This test ensures that an newly created upload without any chunks can be
+// directly finished. There are no calls to ListPart or HeadObject because
+// the upload is not fetched from S3 first.
 func TestEmptyUpload(t *testing.T) {
 	mockCtrl := gomock.NewController(t)
 	defer mockCtrl.Finish()
@@ -193,14 +196,6 @@ func TestEmptyUpload(t *testing.T) {
 			Body:          bytes.NewReader([]byte(`{"ID":"uploadId+multipartId","Size":0,"SizeIsDeferred":false,"Offset":0,"MetaData":null,"IsPartial":false,"IsFinal":false,"PartialUploads":null,"Storage":{"Bucket":"bucket","Key":"uploadId","Type":"s3store"}}`)),
 			ContentLength: aws.Int64(int64(208)),
 		}),
-		s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
-			Bucket:           aws.String("bucket"),
-			Key:              aws.String("uploadId"),
-			UploadId:         aws.String("multipartId"),
-			PartNumberMarker: aws.Int64(0),
-		}).Return(&s3.ListPartsOutput{
-			Parts: []*s3.Part{},
-		}, nil),
 		s3obj.EXPECT().UploadPartWithContext(context.Background(), NewUploadPartInputMatcher(&s3.UploadPartInput{
 			Bucket:     aws.String("bucket"),
 			Key:        aws.String("uploadId"),
@@ -272,6 +267,17 @@ func TestGetInfoNotFound(t *testing.T) {
 		Key:    aws.String("uploadId.info"),
 	}).Return(nil, awserr.New("NoSuchKey", "The specified key does not exist.", nil))
 
+	s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
+		Bucket:           aws.String("bucket"),
+		Key:              aws.String("uploadId"),
+		UploadId:         aws.String("multipartId"),
+		PartNumberMarker: aws.Int64(0),
+	}).Return(nil, awserr.New("NoSuchUpload", "Not found", nil))
+	s3obj.EXPECT().HeadObjectWithContext(context.Background(), &s3.HeadObjectInput{
+		Bucket: aws.String("bucket"),
+		Key:    aws.String("uploadId.part"),
+	}).Return(nil, awserr.New("NoSuchKey", "Not found", nil))
+
 	upload, err := store.GetUpload(context.Background(), "uploadId+multipartId")
 	assert.Nil(err)
 
@@ -287,47 +293,52 @@ func TestGetInfo(t *testing.T) {
 	s3obj := NewMockS3API(mockCtrl)
 	store := New("bucket", s3obj)
 
-	gomock.InOrder(
-		s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
-			Bucket: aws.String("bucket"),
-			Key:    aws.String("uploadId.info"),
-		}).Return(&s3.GetObjectOutput{
-			Body: ioutil.NopCloser(bytes.NewReader([]byte(`{"ID":"uploadId+multipartId","Size":500,"Offset":0,"MetaData":{"bar":"menü","foo":"hello"},"IsPartial":false,"IsFinal":false,"PartialUploads":null,"Storage":{"Bucket":"bucket","Key":"my/uploaded/files/uploadId","Type":"s3store"}}`))),
-		}, nil),
-		s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
-			Bucket:           aws.String("bucket"),
-			Key:              aws.String("uploadId"),
-			UploadId:         aws.String("multipartId"),
-			PartNumberMarker: aws.Int64(0),
-		}).Return(&s3.ListPartsOutput{
-			Parts: []*s3.Part{
-				{
-					Size: aws.Int64(100),
-				},
-				{
-					Size: aws.Int64(200),
-				},
+	s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
+		Bucket: aws.String("bucket"),
+		Key:    aws.String("uploadId.info"),
+	}).Return(&s3.GetObjectOutput{
+		Body: ioutil.NopCloser(bytes.NewReader([]byte(`{"ID":"uploadId+multipartId","Size":500,"Offset":0,"MetaData":{"bar":"menü","foo":"hello"},"IsPartial":false,"IsFinal":false,"PartialUploads":null,"Storage":{"Bucket":"bucket","Key":"my/uploaded/files/uploadId","Type":"s3store"}}`))),
+	}, nil)
+	s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
+		Bucket:           aws.String("bucket"),
+		Key:              aws.String("uploadId"),
+		UploadId:         aws.String("multipartId"),
+		PartNumberMarker: aws.Int64(0),
+	}).Return(&s3.ListPartsOutput{
+		Parts: []*s3.Part{
+			{
+				PartNumber: aws.Int64(1),
+				Size:       aws.Int64(100),
+				ETag:       aws.String("etag-1"),
 			},
-			NextPartNumberMarker: aws.Int64(2),
-			IsTruncated:          aws.Bool(true),
-		}, nil),
-		s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
-			Bucket:           aws.String("bucket"),
-			Key:              aws.String("uploadId"),
-			UploadId:         aws.String("multipartId"),
-			PartNumberMarker: aws.Int64(2),
-		}).Return(&s3.ListPartsOutput{
-			Parts: []*s3.Part{
-				{
-					Size: aws.Int64(100),
-				},
+			{
+				PartNumber: aws.Int64(2),
+				Size:       aws.Int64(200),
+				ETag:       aws.String("etag-2"),
 			},
-		}, nil),
-		s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
-			Bucket: aws.String("bucket"),
-			Key:    aws.String("uploadId.part"),
-		}).Return(&s3.GetObjectOutput{}, awserr.New("NoSuchKey", "Not found", nil)),
-	)
+		},
+		NextPartNumberMarker: aws.Int64(2),
+		// Simulate a truncated response, so s3store should send a second request
+		IsTruncated: aws.Bool(true),
+	}, nil)
+	s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
+		Bucket:           aws.String("bucket"),
+		Key:              aws.String("uploadId"),
+		UploadId:         aws.String("multipartId"),
+		PartNumberMarker: aws.Int64(2),
+	}).Return(&s3.ListPartsOutput{
+		Parts: []*s3.Part{
+			{
+				PartNumber: aws.Int64(3),
+				Size:       aws.Int64(100),
+				ETag:       aws.String("etag-3"),
+			},
+		},
+	}, nil)
+	s3obj.EXPECT().HeadObjectWithContext(context.Background(), &s3.HeadObjectInput{
+		Bucket: aws.String("bucket"),
+		Key:    aws.String("uploadId.part"),
+	}).Return(nil, awserr.New("NoSuchKey", "Not found", nil))
 
 	upload, err := store.GetUpload(context.Background(), "uploadId+multipartId")
 	assert.Nil(err)
@@ -353,47 +364,52 @@ func TestGetInfoWithMetadataObjectPrefix(t *testing.T) {
 	store := New("bucket", s3obj)
 	store.MetadataObjectPrefix = "my/metadata"
 
-	gomock.InOrder(
-		s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
-			Bucket: aws.String("bucket"),
-			Key:    aws.String("my/metadata/uploadId.info"),
-		}).Return(&s3.GetObjectOutput{
-			Body: ioutil.NopCloser(bytes.NewReader([]byte(`{"ID":"uploadId+multipartId","Size":500,"Offset":0,"MetaData":{"bar":"menü","foo":"hello"},"IsPartial":false,"IsFinal":false,"PartialUploads":null,"Storage":{"Bucket":"bucket","Key":"my/uploaded/files/uploadId","Type":"s3store"}}`))),
-		}, nil),
-		s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
-			Bucket:           aws.String("bucket"),
-			Key:              aws.String("uploadId"),
-			UploadId:         aws.String("multipartId"),
-			PartNumberMarker: aws.Int64(0),
-		}).Return(&s3.ListPartsOutput{
-			Parts: []*s3.Part{
-				{
-					Size: aws.Int64(100),
-				},
-				{
-					Size: aws.Int64(200),
-				},
+	s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
+		Bucket: aws.String("bucket"),
+		Key:    aws.String("my/metadata/uploadId.info"),
+	}).Return(&s3.GetObjectOutput{
+		Body: ioutil.NopCloser(bytes.NewReader([]byte(`{"ID":"uploadId+multipartId","Size":500,"Offset":0,"MetaData":{"bar":"menü","foo":"hello"},"IsPartial":false,"IsFinal":false,"PartialUploads":null,"Storage":{"Bucket":"bucket","Key":"my/uploaded/files/uploadId","Type":"s3store"}}`))),
+	}, nil)
+	s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
+		Bucket:           aws.String("bucket"),
+		Key:              aws.String("uploadId"),
+		UploadId:         aws.String("multipartId"),
+		PartNumberMarker: aws.Int64(0),
+	}).Return(&s3.ListPartsOutput{
+		Parts: []*s3.Part{
+			{
+				PartNumber: aws.Int64(1),
+				Size:       aws.Int64(100),
+				ETag:       aws.String("etag-1"),
 			},
-			NextPartNumberMarker: aws.Int64(2),
-			IsTruncated:          aws.Bool(true),
-		}, nil),
-		s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
-			Bucket:           aws.String("bucket"),
-			Key:              aws.String("uploadId"),
-			UploadId:         aws.String("multipartId"),
-			PartNumberMarker: aws.Int64(2),
-		}).Return(&s3.ListPartsOutput{
-			Parts: []*s3.Part{
-				{
-					Size: aws.Int64(100),
-				},
+			{
+				PartNumber: aws.Int64(2),
+				Size:       aws.Int64(200),
+				ETag:       aws.String("etag-2"),
 			},
-		}, nil),
-		s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
-			Bucket: aws.String("bucket"),
-			Key:    aws.String("my/metadata/uploadId.part"),
-		}).Return(&s3.GetObjectOutput{}, awserr.New("NoSuchKey", "Not found", nil)),
-	)
+		},
+		NextPartNumberMarker: aws.Int64(2),
+		// Simulate a truncated response, so s3store should send a second request
+		IsTruncated: aws.Bool(true),
+	}, nil)
+	s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
+		Bucket:           aws.String("bucket"),
+		Key:              aws.String("uploadId"),
+		UploadId:         aws.String("multipartId"),
+		PartNumberMarker: aws.Int64(2),
+	}).Return(&s3.ListPartsOutput{
+		Parts: []*s3.Part{
+			{
+				PartNumber: aws.Int64(3),
+				Size:       aws.Int64(100),
+				ETag:       aws.String("etag-3"),
+			},
+		},
+	}, nil)
+	s3obj.EXPECT().HeadObjectWithContext(context.Background(), &s3.HeadObjectInput{
+		Bucket: aws.String("bucket"),
+		Key:    aws.String("my/metadata/uploadId.part"),
+	}).Return(nil, awserr.New("NoSuchKey", "Not found", nil))
 
 	upload, err := store.GetUpload(context.Background(), "uploadId+multipartId")
 	assert.Nil(err)
@@ -418,27 +434,24 @@ func TestGetInfoWithIncompletePart(t *testing.T) {
 	s3obj := NewMockS3API(mockCtrl)
 	store := New("bucket", s3obj)
 
-	gomock.InOrder(
-		s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
-			Bucket: aws.String("bucket"),
-			Key:    aws.String("uploadId.info"),
-		}).Return(&s3.GetObjectOutput{
-			Body: ioutil.NopCloser(bytes.NewReader([]byte(`{"ID":"uploadId+multipartId","Size":500,"Offset":0,"MetaData":{},"IsPartial":false,"IsFinal":false,"PartialUploads":null,"Storage":null}`))),
-		}, nil),
-		s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
-			Bucket:           aws.String("bucket"),
-			Key:              aws.String("uploadId"),
-			UploadId:         aws.String("multipartId"),
-			PartNumberMarker: aws.Int64(0),
-		}).Return(&s3.ListPartsOutput{Parts: []*s3.Part{}}, nil),
-		s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
-			Bucket: aws.String("bucket"),
-			Key:    aws.String("uploadId.part"),
-		}).Return(&s3.GetObjectOutput{
-			ContentLength: aws.Int64(10),
-			Body:          ioutil.NopCloser(bytes.NewReader([]byte("0123456789"))),
-		}, nil),
-	)
+	s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
+		Bucket: aws.String("bucket"),
+		Key:    aws.String("uploadId.info"),
+	}).Return(&s3.GetObjectOutput{
+		Body: ioutil.NopCloser(bytes.NewReader([]byte(`{"ID":"uploadId+multipartId","Size":500,"Offset":0,"MetaData":{},"IsPartial":false,"IsFinal":false,"PartialUploads":null,"Storage":null}`))),
+	}, nil)
+	s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
+		Bucket:           aws.String("bucket"),
+		Key:              aws.String("uploadId"),
+		UploadId:         aws.String("multipartId"),
+		PartNumberMarker: aws.Int64(0),
+	}).Return(&s3.ListPartsOutput{Parts: []*s3.Part{}}, nil)
+	s3obj.EXPECT().HeadObjectWithContext(context.Background(), &s3.HeadObjectInput{
+		Bucket: aws.String("bucket"),
+		Key:    aws.String("uploadId.part"),
+	}).Return(&s3.HeadObjectOutput{
+		ContentLength: aws.Int64(10),
+	}, nil)
 
 	upload, err := store.GetUpload(context.Background(), "uploadId+multipartId")
 	assert.Nil(err)
@@ -457,20 +470,22 @@ func TestGetInfoFinished(t *testing.T) {
 	s3obj := NewMockS3API(mockCtrl)
 	store := New("bucket", s3obj)
 
-	gomock.InOrder(
-		s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
-			Bucket: aws.String("bucket"),
-			Key:    aws.String("uploadId.info"),
-		}).Return(&s3.GetObjectOutput{
-			Body: ioutil.NopCloser(bytes.NewReader([]byte(`{"ID":"uploadId","Size":500,"Offset":0,"MetaData":null,"IsPartial":false,"IsFinal":false,"PartialUploads":null,"Storage":null}`))),
-		}, nil),
-		s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
-			Bucket:           aws.String("bucket"),
-			Key:              aws.String("uploadId"),
-			UploadId:         aws.String("multipartId"),
-			PartNumberMarker: aws.Int64(0),
-		}).Return(nil, awserr.New("NoSuchUpload", "The specified upload does not exist.", nil)),
-	)
+	s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
+		Bucket: aws.String("bucket"),
+		Key:    aws.String("uploadId.info"),
+	}).Return(&s3.GetObjectOutput{
+		Body: ioutil.NopCloser(bytes.NewReader([]byte(`{"ID":"uploadId","Size":500,"Offset":0,"MetaData":null,"IsPartial":false,"IsFinal":false,"PartialUploads":null,"Storage":null}`))),
+	}, nil)
+	s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
+		Bucket:           aws.String("bucket"),
+		Key:              aws.String("uploadId"),
+		UploadId:         aws.String("multipartId"),
+		PartNumberMarker: aws.Int64(0),
+	}).Return(nil, awserr.New("NoSuchUpload", "The specified upload does not exist.", nil))
+	s3obj.EXPECT().HeadObjectWithContext(context.Background(), &s3.HeadObjectInput{
+		Bucket: aws.String("bucket"),
+		Key:    aws.String("uploadId.part"),
+	}).Return(nil, awserr.New("NoSuchKey", "Not found", nil))
 
 	upload, err := store.GetUpload(context.Background(), "uploadId+multipartId")
 	assert.Nil(err)
@@ -561,7 +576,7 @@ func TestGetReaderNotFinished(t *testing.T) {
 
 	content, err := upload.GetReader(context.Background())
 	assert.Nil(content)
-	assert.Equal("cannot stream non-finished upload", err.Error())
+	assert.Equal("ERR_INCOMPLETE_UPLOAD: cannot stream non-finished upload", err.Error())
 }
 
 func TestDeclareLength(t *testing.T) {
@@ -572,32 +587,30 @@ func TestDeclareLength(t *testing.T) {
 	s3obj := NewMockS3API(mockCtrl)
 	store := New("bucket", s3obj)
 
-	gomock.InOrder(
-		s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
-			Bucket: aws.String("bucket"),
-			Key:    aws.String("uploadId.info"),
-		}).Return(&s3.GetObjectOutput{
-			Body: ioutil.NopCloser(bytes.NewReader([]byte(`{"ID":"uploadId+multipartId","Size":0,"SizeIsDeferred":true,"Offset":0,"MetaData":{},"IsPartial":false,"IsFinal":false,"PartialUploads":null,"Storage":{"Bucket":"bucket","Key":"uploadId","Type":"s3store"}}`))),
-		}, nil),
-		s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
-			Bucket:           aws.String("bucket"),
-			Key:              aws.String("uploadId"),
-			UploadId:         aws.String("multipartId"),
-			PartNumberMarker: aws.Int64(0),
-		}).Return(&s3.ListPartsOutput{
-			Parts: []*s3.Part{},
-		}, nil),
-		s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
-			Bucket: aws.String("bucket"),
-			Key:    aws.String("uploadId.part"),
-		}).Return(nil, awserr.New("NotFound", "Not Found", nil)),
-		s3obj.EXPECT().PutObjectWithContext(context.Background(), &s3.PutObjectInput{
-			Bucket:        aws.String("bucket"),
-			Key:           aws.String("uploadId.info"),
-			Body:          bytes.NewReader([]byte(`{"ID":"uploadId+multipartId","Size":500,"SizeIsDeferred":false,"Offset":0,"MetaData":{},"IsPartial":false,"IsFinal":false,"PartialUploads":null,"Storage":{"Bucket":"bucket","Key":"uploadId","Type":"s3store"}}`)),
-			ContentLength: aws.Int64(int64(208)),
-		}),
-	)
+	s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
+		Bucket: aws.String("bucket"),
+		Key:    aws.String("uploadId.info"),
+	}).Return(&s3.GetObjectOutput{
+		Body: ioutil.NopCloser(bytes.NewReader([]byte(`{"ID":"uploadId+multipartId","Size":0,"SizeIsDeferred":true,"Offset":0,"MetaData":{},"IsPartial":false,"IsFinal":false,"PartialUploads":null,"Storage":{"Bucket":"bucket","Key":"uploadId","Type":"s3store"}}`))),
+	}, nil)
+	s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
+		Bucket:           aws.String("bucket"),
+		Key:              aws.String("uploadId"),
+		UploadId:         aws.String("multipartId"),
+		PartNumberMarker: aws.Int64(0),
+	}).Return(&s3.ListPartsOutput{
+		Parts: []*s3.Part{},
+	}, nil)
+	s3obj.EXPECT().HeadObjectWithContext(context.Background(), &s3.HeadObjectInput{
+		Bucket: aws.String("bucket"),
+		Key:    aws.String("uploadId.part"),
+	}).Return(nil, awserr.New("NotFound", "Not Found", nil))
+	s3obj.EXPECT().PutObjectWithContext(context.Background(), &s3.PutObjectInput{
+		Bucket:        aws.String("bucket"),
+		Key:           aws.String("uploadId.info"),
+		Body:          bytes.NewReader([]byte(`{"ID":"uploadId+multipartId","Size":500,"SizeIsDeferred":false,"Offset":0,"MetaData":{},"IsPartial":false,"IsFinal":false,"PartialUploads":null,"Storage":{"Bucket":"bucket","Key":"uploadId","Type":"s3store"}}`)),
+		ContentLength: aws.Int64(int64(208)),
+	})
 
 	upload, err := store.GetUpload(context.Background(), "uploadId+multipartId")
 	assert.Nil(err)
@@ -617,64 +630,72 @@ func TestFinishUpload(t *testing.T) {
 	s3obj := NewMockS3API(mockCtrl)
 	store := New("bucket", s3obj)
 
-	gomock.InOrder(
-		s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
-			Bucket:           aws.String("bucket"),
-			Key:              aws.String("uploadId"),
-			UploadId:         aws.String("multipartId"),
-			PartNumberMarker: aws.Int64(0),
-		}).Return(&s3.ListPartsOutput{
-			Parts: []*s3.Part{
+	s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
+		Bucket: aws.String("bucket"),
+		Key:    aws.String("uploadId.info"),
+	}).Return(&s3.GetObjectOutput{
+		Body: ioutil.NopCloser(bytes.NewReader([]byte(`{"ID":"uploadId","Size":400,"Offset":0,"MetaData":null,"IsPartial":false,"IsFinal":false,"PartialUploads":null,"Storage":null}`))),
+	}, nil)
+	s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
+		Bucket:           aws.String("bucket"),
+		Key:              aws.String("uploadId"),
+		UploadId:         aws.String("multipartId"),
+		PartNumberMarker: aws.Int64(0),
+	}).Return(&s3.ListPartsOutput{
+		Parts: []*s3.Part{
+			{
+				Size:       aws.Int64(100),
+				ETag:       aws.String("etag-1"),
+				PartNumber: aws.Int64(1),
+			},
+			{
+				Size:       aws.Int64(200),
+				ETag:       aws.String("etag-2"),
+				PartNumber: aws.Int64(2),
+			},
+		},
+		NextPartNumberMarker: aws.Int64(2),
+		IsTruncated:          aws.Bool(true),
+	}, nil)
+	s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
+		Bucket:           aws.String("bucket"),
+		Key:              aws.String("uploadId"),
+		UploadId:         aws.String("multipartId"),
+		PartNumberMarker: aws.Int64(2),
+	}).Return(&s3.ListPartsOutput{
+		Parts: []*s3.Part{
+			{
+				Size:       aws.Int64(100),
+				ETag:       aws.String("etag-3"),
+				PartNumber: aws.Int64(3),
+			},
+		},
+	}, nil)
+	s3obj.EXPECT().HeadObjectWithContext(context.Background(), &s3.HeadObjectInput{
+		Bucket: aws.String("bucket"),
+		Key:    aws.String("uploadId.part"),
+	}).Return(nil, awserr.New("NotFound", "Not Found", nil))
+	s3obj.EXPECT().CompleteMultipartUploadWithContext(context.Background(), &s3.CompleteMultipartUploadInput{
+		Bucket:   aws.String("bucket"),
+		Key:      aws.String("uploadId"),
+		UploadId: aws.String("multipartId"),
+		MultipartUpload: &s3.CompletedMultipartUpload{
+			Parts: []*s3.CompletedPart{
 				{
-					Size:       aws.Int64(100),
-					ETag:       aws.String("foo"),
+					ETag:       aws.String("etag-1"),
 					PartNumber: aws.Int64(1),
 				},
 				{
-					Size:       aws.Int64(200),
-					ETag:       aws.String("bar"),
+					ETag:       aws.String("etag-2"),
 					PartNumber: aws.Int64(2),
 				},
-			},
-			NextPartNumberMarker: aws.Int64(2),
-			IsTruncated:          aws.Bool(true),
-		}, nil),
-		s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
-			Bucket:           aws.String("bucket"),
-			Key:              aws.String("uploadId"),
-			UploadId:         aws.String("multipartId"),
-			PartNumberMarker: aws.Int64(2),
-		}).Return(&s3.ListPartsOutput{
-			Parts: []*s3.Part{
 				{
-					Size:       aws.Int64(100),
-					ETag:       aws.String("foobar"),
+					ETag:       aws.String("etag-3"),
 					PartNumber: aws.Int64(3),
 				},
 			},
-		}, nil),
-		s3obj.EXPECT().CompleteMultipartUploadWithContext(context.Background(), &s3.CompleteMultipartUploadInput{
-			Bucket:   aws.String("bucket"),
-			Key:      aws.String("uploadId"),
-			UploadId: aws.String("multipartId"),
-			MultipartUpload: &s3.CompletedMultipartUpload{
-				Parts: []*s3.CompletedPart{
-					{
-						ETag:       aws.String("foo"),
-						PartNumber: aws.Int64(1),
-					},
-					{
-						ETag:       aws.String("bar"),
-						PartNumber: aws.Int64(2),
-					},
-					{
-						ETag:       aws.String("foobar"),
-						PartNumber: aws.Int64(3),
-					},
-				},
-			},
-		}).Return(nil, nil),
-	)
+		},
+	}).Return(nil, nil)
 
 	upload, err := store.GetUpload(context.Background(), "uploadId+multipartId")
 	assert.Nil(err)
@@ -696,6 +717,7 @@ func TestWriteChunk(t *testing.T) {
 	store.MaxMultipartParts = 10000
 	store.MaxObjectSize = 5 * 1024 * 1024 * 1024 * 1024
 
+	// From GetInfo
 	s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
 		Bucket: aws.String("bucket"),
 		Key:    aws.String("uploadId.info"),
@@ -710,50 +732,58 @@ func TestWriteChunk(t *testing.T) {
 	}).Return(&s3.ListPartsOutput{
 		Parts: []*s3.Part{
 			{
-				Size: aws.Int64(100),
+				Size:       aws.Int64(100),
+				ETag:       aws.String("etag-1"),
+				PartNumber: aws.Int64(1),
 			},
 			{
-				Size: aws.Int64(200),
+				Size:       aws.Int64(200),
+				ETag:       aws.String("etag-2"),
+				PartNumber: aws.Int64(2),
 			},
 		},
-	}, nil).Times(2)
-	s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
+	}, nil)
+	s3obj.EXPECT().HeadObjectWithContext(context.Background(), &s3.HeadObjectInput{
 		Bucket: aws.String("bucket"),
 		Key:    aws.String("uploadId.part"),
-	}).Return(&s3.GetObjectOutput{}, awserr.New("NoSuchKey", "Not found", nil))
-	s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
-		Bucket: aws.String("bucket"),
-		Key:    aws.String("uploadId.part"),
-	}).Return(&s3.GetObjectOutput{}, awserr.New("NoSuchKey", "The specified key does not exist.", nil))
+	}).Return(nil, awserr.New("NoSuchKey", "Not found", nil))
 
-	gomock.InOrder(
-		s3obj.EXPECT().UploadPartWithContext(context.Background(), NewUploadPartInputMatcher(&s3.UploadPartInput{
-			Bucket:     aws.String("bucket"),
-			Key:        aws.String("uploadId"),
-			UploadId:   aws.String("multipartId"),
-			PartNumber: aws.Int64(3),
-			Body:       bytes.NewReader([]byte("1234")),
-		})).Return(nil, nil),
-		s3obj.EXPECT().UploadPartWithContext(context.Background(), NewUploadPartInputMatcher(&s3.UploadPartInput{
-			Bucket:     aws.String("bucket"),
-			Key:        aws.String("uploadId"),
-			UploadId:   aws.String("multipartId"),
-			PartNumber: aws.Int64(4),
-			Body:       bytes.NewReader([]byte("5678")),
-		})).Return(nil, nil),
-		s3obj.EXPECT().UploadPartWithContext(context.Background(), NewUploadPartInputMatcher(&s3.UploadPartInput{
-			Bucket:     aws.String("bucket"),
-			Key:        aws.String("uploadId"),
-			UploadId:   aws.String("multipartId"),
-			PartNumber: aws.Int64(5),
-			Body:       bytes.NewReader([]byte("90AB")),
-		})).Return(nil, nil),
-		s3obj.EXPECT().PutObjectWithContext(context.Background(), NewPutObjectInputMatcher(&s3.PutObjectInput{
-			Bucket: aws.String("bucket"),
-			Key:    aws.String("uploadId.part"),
-			Body:   bytes.NewReader([]byte("CD")),
-		})).Return(nil, nil),
-	)
+	// From WriteChunk
+	s3obj.EXPECT().UploadPartWithContext(context.Background(), NewUploadPartInputMatcher(&s3.UploadPartInput{
+		Bucket:        aws.String("bucket"),
+		Key:           aws.String("uploadId"),
+		UploadId:      aws.String("multipartId"),
+		PartNumber:    aws.Int64(3),
+		Body:          bytes.NewReader([]byte("1234")),
+		ContentLength: aws.Int64(4),
+	})).Return(&s3.UploadPartOutput{
+		ETag: aws.String("etag-3"),
+	}, nil)
+	s3obj.EXPECT().UploadPartWithContext(context.Background(), NewUploadPartInputMatcher(&s3.UploadPartInput{
+		Bucket:        aws.String("bucket"),
+		Key:           aws.String("uploadId"),
+		UploadId:      aws.String("multipartId"),
+		PartNumber:    aws.Int64(4),
+		Body:          bytes.NewReader([]byte("5678")),
+		ContentLength: aws.Int64(4),
+	})).Return(&s3.UploadPartOutput{
+		ETag: aws.String("etag-4"),
+	}, nil)
+	s3obj.EXPECT().UploadPartWithContext(context.Background(), NewUploadPartInputMatcher(&s3.UploadPartInput{
+		Bucket:        aws.String("bucket"),
+		Key:           aws.String("uploadId"),
+		UploadId:      aws.String("multipartId"),
+		PartNumber:    aws.Int64(5),
+		Body:          bytes.NewReader([]byte("90AB")),
+		ContentLength: aws.Int64(4),
+	})).Return(&s3.UploadPartOutput{
+		ETag: aws.String("etag-5"),
+	}, nil)
+	s3obj.EXPECT().PutObjectWithContext(context.Background(), NewPutObjectInputMatcher(&s3.PutObjectInput{
+		Bucket: aws.String("bucket"),
+		Key:    aws.String("uploadId.part"),
+		Body:   bytes.NewReader([]byte("CD")),
+	})).Return(nil, nil)
 
 	upload, err := store.GetUpload(context.Background(), "uploadId+multipartId")
 	assert.Nil(err)
@@ -785,29 +815,27 @@ func TestWriteChunkWriteIncompletePartBecauseTooSmall(t *testing.T) {
 	}).Return(&s3.ListPartsOutput{
 		Parts: []*s3.Part{
 			{
-				Size: aws.Int64(100),
+				Size:       aws.Int64(100),
+				ETag:       aws.String("etag-1"),
+				PartNumber: aws.Int64(1),
 			},
 			{
-				Size: aws.Int64(200),
+				Size:       aws.Int64(200),
+				ETag:       aws.String("etag-2"),
+				PartNumber: aws.Int64(2),
 			},
 		},
-	}, nil).Times(2)
-	s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
+	}, nil)
+	s3obj.EXPECT().HeadObjectWithContext(context.Background(), &s3.HeadObjectInput{
 		Bucket: aws.String("bucket"),
 		Key:    aws.String("uploadId.part"),
-	}).Return(&s3.GetObjectOutput{}, awserr.New("NoSuchKey", "The specified key does not exist", nil))
+	}).Return(nil, awserr.New("NoSuchKey", "The specified key does not exist", nil))
 
-	gomock.InOrder(
-		s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
-			Bucket: aws.String("bucket"),
-			Key:    aws.String("uploadId.part"),
-		}).Return(&s3.GetObjectOutput{}, awserr.New("NoSuchKey", "The specified key does not exist.", nil)),
-		s3obj.EXPECT().PutObjectWithContext(context.Background(), NewPutObjectInputMatcher(&s3.PutObjectInput{
-			Bucket: aws.String("bucket"),
-			Key:    aws.String("uploadId.part"),
-			Body:   bytes.NewReader([]byte("1234567890")),
-		})).Return(nil, nil),
-	)
+	s3obj.EXPECT().PutObjectWithContext(context.Background(), NewPutObjectInputMatcher(&s3.PutObjectInput{
+		Bucket: aws.String("bucket"),
+		Key:    aws.String("uploadId.part"),
+		Body:   bytes.NewReader([]byte("1234567890")),
+	})).Return(nil, nil)
 
 	upload, err := store.GetUpload(context.Background(), "uploadId+multipartId")
 	assert.Nil(err)
@@ -836,12 +864,19 @@ func TestWriteChunkPrependsIncompletePart(t *testing.T) {
 	}).Return(&s3.GetObjectOutput{
 		Body: ioutil.NopCloser(bytes.NewReader([]byte(`{"ID":"uploadId","Size":5,"Offset":0,"MetaData":null,"IsPartial":false,"IsFinal":false,"PartialUploads":null,"Storage":null}`))),
 	}, nil)
-	s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
+	s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
+		Bucket:           aws.String("bucket"),
+		Key:              aws.String("uploadId"),
+		UploadId:         aws.String("multipartId"),
+		PartNumberMarker: aws.Int64(0),
+	}).Return(&s3.ListPartsOutput{
+		Parts: []*s3.Part{},
+	}, nil)
+	s3obj.EXPECT().HeadObjectWithContext(context.Background(), &s3.HeadObjectInput{
 		Bucket: aws.String("bucket"),
 		Key:    aws.String("uploadId.part"),
-	}).Return(&s3.GetObjectOutput{
+	}).Return(&s3.HeadObjectOutput{
 		ContentLength: aws.Int64(3),
-		Body:          ioutil.NopCloser(bytes.NewReader([]byte("123"))),
 	}, nil)
 	s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
 		Bucket: aws.String("bucket"),
@@ -854,29 +889,27 @@ func TestWriteChunkPrependsIncompletePart(t *testing.T) {
 		Bucket: aws.String(store.Bucket),
 		Key:    aws.String("uploadId.part"),
 	}).Return(&s3.DeleteObjectOutput{}, nil)
-	s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
-		Bucket:           aws.String("bucket"),
-		Key:              aws.String("uploadId"),
-		UploadId:         aws.String("multipartId"),
-		PartNumberMarker: aws.Int64(0),
-	}).Return(&s3.ListPartsOutput{Parts: []*s3.Part{}}, nil).Times(2)
 
-	gomock.InOrder(
-		s3obj.EXPECT().UploadPartWithContext(context.Background(), NewUploadPartInputMatcher(&s3.UploadPartInput{
-			Bucket:     aws.String("bucket"),
-			Key:        aws.String("uploadId"),
-			UploadId:   aws.String("multipartId"),
-			PartNumber: aws.Int64(1),
-			Body:       bytes.NewReader([]byte("1234")),
-		})).Return(nil, nil),
-		s3obj.EXPECT().UploadPartWithContext(context.Background(), NewUploadPartInputMatcher(&s3.UploadPartInput{
-			Bucket:     aws.String("bucket"),
-			Key:        aws.String("uploadId"),
-			UploadId:   aws.String("multipartId"),
-			PartNumber: aws.Int64(2),
-			Body:       bytes.NewReader([]byte("5")),
-		})).Return(nil, nil),
-	)
+	s3obj.EXPECT().UploadPartWithContext(context.Background(), NewUploadPartInputMatcher(&s3.UploadPartInput{
+		Bucket:        aws.String("bucket"),
+		Key:           aws.String("uploadId"),
+		UploadId:      aws.String("multipartId"),
+		PartNumber:    aws.Int64(1),
+		Body:          bytes.NewReader([]byte("1234")),
+		ContentLength: aws.Int64(4),
+	})).Return(&s3.UploadPartOutput{
+		ETag: aws.String("etag-1"),
+	}, nil)
+	s3obj.EXPECT().UploadPartWithContext(context.Background(), NewUploadPartInputMatcher(&s3.UploadPartInput{
+		Bucket:        aws.String("bucket"),
+		Key:           aws.String("uploadId"),
+		UploadId:      aws.String("multipartId"),
+		PartNumber:    aws.Int64(2),
+		Body:          bytes.NewReader([]byte("5")),
+		ContentLength: aws.Int64(1),
+	})).Return(&s3.UploadPartOutput{
+		ETag: aws.String("etag-2"),
+	}, nil)
 
 	upload, err := store.GetUpload(context.Background(), "uploadId+multipartId")
 	assert.Nil(err)
@@ -910,33 +943,40 @@ func TestWriteChunkPrependsIncompletePartAndWritesANewIncompletePart(t *testing.
 		Key:              aws.String("uploadId"),
 		UploadId:         aws.String("multipartId"),
 		PartNumberMarker: aws.Int64(0),
-	}).Return(&s3.ListPartsOutput{Parts: []*s3.Part{}}, nil).Times(2)
+	}).Return(&s3.ListPartsOutput{Parts: []*s3.Part{}}, nil)
+	s3obj.EXPECT().HeadObjectWithContext(context.Background(), &s3.HeadObjectInput{
+		Bucket: aws.String("bucket"),
+		Key:    aws.String("uploadId.part"),
+	}).Return(&s3.HeadObjectOutput{
+		ContentLength: aws.Int64(3),
+	}, nil)
 	s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
 		Bucket: aws.String("bucket"),
 		Key:    aws.String("uploadId.part"),
 	}).Return(&s3.GetObjectOutput{
 		ContentLength: aws.Int64(3),
 		Body:          ioutil.NopCloser(bytes.NewReader([]byte("123"))),
-	}, nil).Times(2)
+	}, nil)
 	s3obj.EXPECT().DeleteObjectWithContext(context.Background(), &s3.DeleteObjectInput{
 		Bucket: aws.String(store.Bucket),
 		Key:    aws.String("uploadId.part"),
 	}).Return(&s3.DeleteObjectOutput{}, nil)
 
-	gomock.InOrder(
-		s3obj.EXPECT().UploadPartWithContext(context.Background(), NewUploadPartInputMatcher(&s3.UploadPartInput{
-			Bucket:     aws.String("bucket"),
-			Key:        aws.String("uploadId"),
-			UploadId:   aws.String("multipartId"),
-			PartNumber: aws.Int64(1),
-			Body:       bytes.NewReader([]byte("1234")),
-		})).Return(nil, nil),
-		s3obj.EXPECT().PutObjectWithContext(context.Background(), NewPutObjectInputMatcher(&s3.PutObjectInput{
-			Bucket: aws.String("bucket"),
-			Key:    aws.String("uploadId.part"),
-			Body:   bytes.NewReader([]byte("5")),
-		})).Return(nil, nil),
-	)
+	s3obj.EXPECT().UploadPartWithContext(context.Background(), NewUploadPartInputMatcher(&s3.UploadPartInput{
+		Bucket:        aws.String("bucket"),
+		Key:           aws.String("uploadId"),
+		UploadId:      aws.String("multipartId"),
+		PartNumber:    aws.Int64(1),
+		Body:          bytes.NewReader([]byte("1234")),
+		ContentLength: aws.Int64(4),
+	})).Return(&s3.UploadPartOutput{
+		ETag: aws.String("etag-1"),
+	}, nil)
+	s3obj.EXPECT().PutObjectWithContext(context.Background(), NewPutObjectInputMatcher(&s3.PutObjectInput{
+		Bucket: aws.String("bucket"),
+		Key:    aws.String("uploadId.part"),
+		Body:   bytes.NewReader([]byte("5")),
+	})).Return(nil, nil)
 
 	upload, err := store.GetUpload(context.Background(), "uploadId+multipartId")
 	assert.Nil(err)
@@ -969,28 +1009,31 @@ func TestWriteChunkAllowTooSmallLast(t *testing.T) {
 	}).Return(&s3.ListPartsOutput{
 		Parts: []*s3.Part{
 			{
-				Size: aws.Int64(400),
+				PartNumber: aws.Int64(1),
+				Size:       aws.Int64(400),
+				ETag:       aws.String("etag-1"),
 			},
 			{
-				Size: aws.Int64(90),
+				PartNumber: aws.Int64(2),
+				Size:       aws.Int64(90),
+				ETag:       aws.String("etag-2"),
 			},
 		},
-	}, nil).Times(2)
-	s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
+	}, nil)
+	s3obj.EXPECT().HeadObjectWithContext(context.Background(), &s3.HeadObjectInput{
 		Bucket: aws.String("bucket"),
 		Key:    aws.String("uploadId.part"),
-	}).Return(&s3.GetObjectOutput{}, awserr.New("AccessDenied", "Access Denied.", nil))
-	s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
-		Bucket: aws.String("bucket"),
-		Key:    aws.String("uploadId.part"),
-	}).Return(&s3.GetObjectOutput{}, awserr.New("NoSuchKey", "The specified key does not exist.", nil))
+	}).Return(nil, awserr.New("AccessDenied", "Access Denied.", nil))
 	s3obj.EXPECT().UploadPartWithContext(context.Background(), NewUploadPartInputMatcher(&s3.UploadPartInput{
-		Bucket:     aws.String("bucket"),
-		Key:        aws.String("uploadId"),
-		UploadId:   aws.String("multipartId"),
-		PartNumber: aws.Int64(3),
-		Body:       bytes.NewReader([]byte("1234567890")),
-	})).Return(nil, nil)
+		Bucket:        aws.String("bucket"),
+		Key:           aws.String("uploadId"),
+		UploadId:      aws.String("multipartId"),
+		PartNumber:    aws.Int64(3),
+		Body:          bytes.NewReader([]byte("1234567890")),
+		ContentLength: aws.Int64(10),
+	})).Return(&s3.UploadPartOutput{
+		ETag: aws.String("etag-3"),
+	}, nil)
 
 	upload, err := store.GetUpload(context.Background(), "uploadId+multipartId")
 	assert.Nil(err)
@@ -1101,13 +1144,33 @@ func TestConcatUploadsUsingMultipart(t *testing.T) {
 	store := New("bucket", s3obj)
 	store.MinPartSize = 100
 
+	// Calls from NewUpload
+	s3obj.EXPECT().CreateMultipartUploadWithContext(context.Background(), &s3.CreateMultipartUploadInput{
+		Bucket:   aws.String("bucket"),
+		Key:      aws.String("uploadId"),
+		Metadata: map[string]*string{},
+	}).Return(&s3.CreateMultipartUploadOutput{
+		UploadId: aws.String("multipartId"),
+	}, nil)
+	s3obj.EXPECT().PutObjectWithContext(context.Background(), &s3.PutObjectInput{
+		Bucket:        aws.String("bucket"),
+		Key:           aws.String("uploadId.info"),
+		Body:          bytes.NewReader([]byte(`{"ID":"uploadId+multipartId","Size":0,"SizeIsDeferred":false,"Offset":0,"MetaData":null,"IsPartial":false,"IsFinal":true,"PartialUploads":["aaa+AAA","bbb+BBB","ccc+CCC"],"Storage":{"Bucket":"bucket","Key":"uploadId","Type":"s3store"}}`)),
+		ContentLength: aws.Int64(int64(234)),
+	})
+
+	// Calls from ConcatUploads
 	s3obj.EXPECT().UploadPartCopyWithContext(context.Background(), &s3.UploadPartCopyInput{
 		Bucket:     aws.String("bucket"),
 		Key:        aws.String("uploadId"),
 		UploadId:   aws.String("multipartId"),
 		CopySource: aws.String("bucket/aaa"),
 		PartNumber: aws.Int64(1),
-	}).Return(nil, nil)
+	}).Return(&s3.UploadPartCopyOutput{
+		CopyPartResult: &s3.CopyPartResult{
+			ETag: aws.String("etag-1"),
+		},
+	}, nil)
 
 	s3obj.EXPECT().UploadPartCopyWithContext(context.Background(), &s3.UploadPartCopyInput{
 		Bucket:     aws.String("bucket"),
@@ -1115,7 +1178,11 @@ func TestConcatUploadsUsingMultipart(t *testing.T) {
 		UploadId:   aws.String("multipartId"),
 		CopySource: aws.String("bucket/bbb"),
 		PartNumber: aws.Int64(2),
-	}).Return(nil, nil)
+	}).Return(&s3.UploadPartCopyOutput{
+		CopyPartResult: &s3.CopyPartResult{
+			ETag: aws.String("etag-2"),
+		},
+	}, nil)
 
 	s3obj.EXPECT().UploadPartCopyWithContext(context.Background(), &s3.UploadPartCopyInput{
 		Bucket:     aws.String("bucket"),
@@ -1123,55 +1190,45 @@ func TestConcatUploadsUsingMultipart(t *testing.T) {
 		UploadId:   aws.String("multipartId"),
 		CopySource: aws.String("bucket/ccc"),
 		PartNumber: aws.Int64(3),
-	}).Return(nil, nil)
+	}).Return(&s3.UploadPartCopyOutput{
+		CopyPartResult: &s3.CopyPartResult{
+			ETag: aws.String("etag-3"),
+		},
+	}, nil)
 
-	// Output from s3Store.FinishUpload
-	gomock.InOrder(
-		s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
-			Bucket:           aws.String("bucket"),
-			Key:              aws.String("uploadId"),
-			UploadId:         aws.String("multipartId"),
-			PartNumberMarker: aws.Int64(0),
-		}).Return(&s3.ListPartsOutput{
-			Parts: []*s3.Part{
+	// Calls from FinishUpload
+	s3obj.EXPECT().CompleteMultipartUploadWithContext(context.Background(), &s3.CompleteMultipartUploadInput{
+		Bucket:   aws.String("bucket"),
+		Key:      aws.String("uploadId"),
+		UploadId: aws.String("multipartId"),
+		MultipartUpload: &s3.CompletedMultipartUpload{
+			Parts: []*s3.CompletedPart{
 				{
-					ETag:       aws.String("foo"),
+					ETag:       aws.String("etag-1"),
 					PartNumber: aws.Int64(1),
 				},
 				{
-					ETag:       aws.String("bar"),
+					ETag:       aws.String("etag-2"),
 					PartNumber: aws.Int64(2),
 				},
 				{
-					ETag:       aws.String("baz"),
+					ETag:       aws.String("etag-3"),
 					PartNumber: aws.Int64(3),
 				},
 			},
-		}, nil),
-		s3obj.EXPECT().CompleteMultipartUploadWithContext(context.Background(), &s3.CompleteMultipartUploadInput{
-			Bucket:   aws.String("bucket"),
-			Key:      aws.String("uploadId"),
-			UploadId: aws.String("multipartId"),
-			MultipartUpload: &s3.CompletedMultipartUpload{
-				Parts: []*s3.CompletedPart{
-					{
-						ETag:       aws.String("foo"),
-						PartNumber: aws.Int64(1),
-					},
-					{
-						ETag:       aws.String("bar"),
-						PartNumber: aws.Int64(2),
-					},
-					{
-						ETag:       aws.String("baz"),
-						PartNumber: aws.Int64(3),
-					},
-				},
-			},
-		}).Return(nil, nil),
-	)
+		},
+	}).Return(nil, nil)
 
-	upload, err := store.GetUpload(context.Background(), "uploadId+multipartId")
+	info := handler.FileInfo{
+		ID:      "uploadId",
+		IsFinal: true,
+		PartialUploads: []string{
+			"aaa+AAA",
+			"bbb+BBB",
+			"ccc+CCC",
+		},
+	}
+	upload, err := store.NewUpload(context.Background(), info)
 	assert.Nil(err)
 
 	uploadA, err := store.GetUpload(context.Background(), "aaa+AAA")
@@ -1269,12 +1326,13 @@ type s3APIWithTempFileAssertion struct {
 func (s s3APIWithTempFileAssertion) UploadPartWithContext(context.Context, *s3.UploadPartInput, ...request.Option) (*s3.UploadPartOutput, error) {
 	assert := s.assert
 
-	// Make sure that only the two temporary files from tusd are in here.
+	// Make sure that there are temporary files from tusd in here.
 	files, err := ioutil.ReadDir(s.tempDir)
 	assert.Nil(err)
 	for _, file := range files {
 		assert.True(strings.HasPrefix(file.Name(), "tusd-s3-tmp-"))
 	}
+
 	assert.GreaterOrEqual(len(files), 1)
 	assert.LessOrEqual(len(files), 3)
 
@@ -1317,7 +1375,7 @@ func TestWriteChunkCleansUpTempFiles(t *testing.T) {
 		Bucket: aws.String("bucket"),
 		Key:    aws.String("uploadId.info"),
 	}).Return(&s3.GetObjectOutput{
-		Body: ioutil.NopCloser(bytes.NewReader([]byte(`{"ID":"uploadId","Size":500,"Offset":0,"MetaData":null,"IsPartial":false,"IsFinal":false,"PartialUploads":null,"Storage":null}`))),
+		Body: ioutil.NopCloser(bytes.NewReader([]byte(`{"ID":"uploadId","Size":14,"Offset":0,"MetaData":null,"IsPartial":false,"IsFinal":false,"PartialUploads":null,"Storage":null}`))),
 	}, nil)
 	s3obj.EXPECT().ListPartsWithContext(context.Background(), &s3.ListPartsInput{
 		Bucket:           aws.String("bucket"),
@@ -1325,30 +1383,19 @@ func TestWriteChunkCleansUpTempFiles(t *testing.T) {
 		UploadId:         aws.String("multipartId"),
 		PartNumberMarker: aws.Int64(0),
 	}).Return(&s3.ListPartsOutput{
-		Parts: []*s3.Part{
-			{
-				Size: aws.Int64(100),
-			},
-			{
-				Size: aws.Int64(200),
-			},
-		},
-	}, nil).Times(2)
-	s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
+		Parts: []*s3.Part{},
+	}, nil)
+	s3obj.EXPECT().HeadObjectWithContext(context.Background(), &s3.HeadObjectInput{
 		Bucket: aws.String("bucket"),
 		Key:    aws.String("uploadId.part"),
-	}).Return(&s3.GetObjectOutput{}, awserr.New("NoSuchKey", "Not found", nil))
-	s3obj.EXPECT().GetObjectWithContext(context.Background(), &s3.GetObjectInput{
-		Bucket: aws.String("bucket"),
-		Key:    aws.String("uploadId.part"),
-	}).Return(&s3.GetObjectOutput{}, awserr.New("NoSuchKey", "The specified key does not exist.", nil))
+	}).Return(nil, awserr.New("NoSuchKey", "Not found", nil))
 
 	// No calls to s3obj.EXPECT().UploadPartWithContext since that is handled by s3APIWithTempFileAssertion
 
 	upload, err := store.GetUpload(context.Background(), "uploadId+multipartId")
 	assert.Nil(err)
 
-	bytesRead, err := upload.WriteChunk(context.Background(), 300, bytes.NewReader([]byte("1234567890ABCD")))
+	bytesRead, err := upload.WriteChunk(context.Background(), 0, bytes.NewReader([]byte("1234567890ABCD")))
 	assert.NotNil(err)
 	assert.Equal(err.Error(), "not now")
 	assert.Equal(int64(0), bytesRead)

scripts/build_funcs.sh

@@ -15,7 +15,7 @@ function compile {
   local dir="tusd_${os}_${arch}"
   rm -rf "$dir"
   mkdir -p "$dir"
-  GOOS=$os GOARCH=$arch go build \
+  GOOS=$os GOARCH=$arch CGO_ENABLED=0 go build \
     -trimpath \
     -ldflags="-X github.com/tus/tusd/cmd/tusd/cli.VersionName=${version} -X github.com/tus/tusd/cmd/tusd/cli.GitCommit=${commit} -X 'github.com/tus/tusd/cmd/tusd/cli.BuildDate=$(date --utc)'" \
     -o "$dir/tusd$ext" ./cmd/tusd/main.go