79 lines
3.4 KiB
Go
79 lines
3.4 KiB
Go
package tusd
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import (
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"io"
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)
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type MetaData map[string]string
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type FileInfo struct {
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ID string
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// Total file size in bytes specified in the NewUpload call
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Size int64
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// Offset in bytes (zero-based)
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Offset int64
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MetaData MetaData
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// Indicates that this is a partial upload which will later be used to form
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// a final upload by concatenation. Partial uploads should not be processed
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// when they are finished since they are only incomplete chunks of files.
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IsPartial bool
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// Indicates that this is a final upload
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IsFinal bool
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// If the upload is a final one (see IsFinal) this will be a non-empty
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// ordered slice containing the ids of the uploads of which the final upload
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// will consist after concatenation.
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PartialUploads []string
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}
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type DataStore interface {
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// Create a new upload using the size as the file's length. The method must
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// return an unique id which is used to identify the upload. If no backend
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// (e.g. Riak) specifes the id you may want to use the uid package to
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// generate one. The properties Size and MetaData will be filled.
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NewUpload(info FileInfo) (id string, err error)
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// Write the chunk read from src into the file specified by the id at the
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// given offset. The handler will take care of validating the offset and
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// limiting the size of the src to not overflow the file's size. It may
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// return an os.ErrNotExist which will be interpreted as a 404 Not Found.
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// It will also lock resources while they are written to ensure only one
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// write happens per time.
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// The function call must return the number of bytes written.
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WriteChunk(id string, offset int64, src io.Reader) (int64, error)
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// Read the fileinformation used to validate the offset and respond to HEAD
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// requests. It may return an os.ErrNotExist which will be interpreted as a
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// 404 Not Found.
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GetInfo(id string) (FileInfo, error)
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// Get an io.Reader to allow downloading the file. This feature is not
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// part of the official tus specification. If this additional function
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// should not be enabled any call to GetReader should return
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// tusd.ErrNotImplemented. The length of the resource is determined by
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// retrieving the offset using GetInfo.
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// If the returned reader also implements the io.Closer interface, the
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// Close() method will be invoked once everything has been read.
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GetReader(id string) (io.Reader, error)
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// Terminate an upload so any further requests to the resource, both reading
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// and writing, must return os.ErrNotExist or similar.
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Terminate(id string) error
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}
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// LockerDataStore is the interface required for custom lock persisting mechanisms.
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// Common ways to store this information is in memory, on disk or using an
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// external service, such as ZooKeeper.
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// When multiple processes are attempting to access an upload, whether it be
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// by reading or writing, a syncronization mechanism is required to prevent
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// data corruption, especially to ensure correct offset values and the proper
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// order of chunks inside a single upload.
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type LockerDataStore interface {
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DataStore
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// LockUpload attempts to obtain an exclusive lock for the upload specified
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// by its id.
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// If this operation fails because the resource is already locked, the
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// tusd.ErrFileLocked must be returned. If no error is returned, the attempt
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// is consider to be successful and the upload to be locked until UnlockUpload
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// is invoked for the same upload.
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LockUpload(id string) error
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// UnlockUpload releases an existing lock for the given upload.
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UnlockUpload(id string) error
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}
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