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separated partsize calc and error handling

This commit is contained in:
Markus Kienast 2017-08-24 02:27:57 +02:00
parent f059acc7cc
commit 8831a98c34
2 changed files with 51 additions and 51 deletions
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42
s3store/s3store.go
View File

@ -235,7 +235,7 @@ func (store S3Store) WriteChunk(id string, offset int64, src io.Reader) (int64,
bytesUploaded := int64(0)
optimalPartSize, err := store.CalcOptimalPartSize(size)
if err != nil {
return bytesUploaded, nil
return bytesUploaded, err
}
// Get number of parts to generate next number
@ -561,20 +561,16 @@ func isAwsError(err error, code string) bool {
return false
}
func (store S3Store) CalcOptimalPartSize(size int64) (int64, error) {
func (store S3Store) CalcOptimalPartSize(size int64) (optimalPartSize int64, err error) {
var errorstrings []string
switch {
// We can only manage files up to MaxObjectSize, else we need to fail.
case size > store.MaxObjectSize:
fmt.Print("0 ")
return 0, fmt.Errorf("CalcOptimalPartSize: size of %v bytes exceeds MaxObjectSize of %v bytes", size, store.MaxObjectSize)
// When upload is smaller or equal MinPartSize, we upload in just one part.
case size <= store.MinPartSize:
fmt.Print("A ")
return store.MinPartSize, nil
optimalPartSize = store.MinPartSize
// When we need 9999 parts or less with MinPartSize.
case size/store.MinPartSize < store.MaxMultipartParts:
fmt.Print("B ")
return store.MinPartSize, nil
optimalPartSize = store.MinPartSize
// If our upload divides up exactly into MaxMultipartParts parts with
// no bytes leftover, we will not need an spare last part. So we can go with
// a straight division. Otherwise we would exceed MaxPartSize in a scenario,
@ -582,16 +578,22 @@ func (store S3Store) CalcOptimalPartSize(size int64) (int64, error) {
// (which is not the case with the current AWS S3 API specification, but
// might be in the future or with other S3-aware stores).
case size%store.MaxMultipartParts == 0:
fmt.Print("C ")
return size / store.MaxMultipartParts, nil
// In all other cases, we need to round up to the next integer, as long as we
// stay below MaxPartSize.
case size/store.MaxMultipartParts < store.MaxPartSize:
fmt.Print("D ")
return size/store.MaxMultipartParts + 1, nil
// If non of the above matches, we have exceeded the MaxPartSize limit above.
optimalPartSize = size / store.MaxMultipartParts
// In all other cases, we need to round up to the next integer.
default:
fmt.Print("X ")
return size/store.MaxMultipartParts + 1, fmt.Errorf("CalcOptimalPartSize: to upload %v bytes optimalPartSize %v must exceed MaxPartSize %v", size, (size/store.MaxMultipartParts + 1), store.MaxPartSize)
optimalPartSize = size/store.MaxMultipartParts + 1
}
// an upload larger than MaxObjectSize must throw an error
if size > store.MaxObjectSize {
errorstrings = append(errorstrings, fmt.Sprintf("CalcOptimalPartSize: upload size of %v bytes exceeds MaxObjectSize of %v bytes", size, store.MaxObjectSize))
}
// optimalPartSize must never exceed MaxPartSize
if optimalPartSize > store.MaxPartSize {
errorstrings = append(errorstrings, fmt.Sprintf("CalcOptimalPartSize: to upload %v bytes optimalPartSize %v must exceed MaxPartSize %v", size, optimalPartSize, store.MaxPartSize))
}
if len(errorstrings) > 0 {
err = fmt.Errorf(strings.Join(errorstrings, "\n"))
}
return optimalPartSize, err
}

22
s3store/s3store_test.go
View File

@ -36,10 +36,12 @@ func TestCalcOptimalPartSize(t *testing.T) {
assert.Equal(s3obj, store.Service)
// If you quickly want to override the default values in this test
/*
store.MinPartSize = 2
store.MaxPartSize = 10
store.MaxMultipartParts = 20
store.MaxObjectSize = 201
store.MaxObjectSize = 200
*/
var MinPartSize = store.MinPartSize
var MaxPartSize = store.MaxPartSize
@ -58,9 +60,6 @@ func TestCalcOptimalPartSize(t *testing.T) {
}
var RemainderWithHighestApplicablePartSize int64 = MaxObjectSize % HighestApplicablePartSize
fmt.Println("HighestApplicablePartSize", HighestApplicablePartSize)
fmt.Println("RemainderWithHighestApplicablePartSize", RemainderWithHighestApplicablePartSize)
// some of these tests are actually duplicates, as they specify the same size
// in bytes - two ways to describe the same thing. That is wanted, in order
// to provide a full picture from any angle.
@ -112,19 +111,17 @@ func TestCalcOptimalPartSize(t *testing.T) {
}
for index, size := range testcases {
optimalPartSize, calcError := store.CalcOptimalPartSize(size)
equalparts, lastpartsize = 0, 0
err = ""
optimalPartSize, calcError := store.CalcOptimalPartSize(size)
equalparts = size / optimalPartSize
lastpartsize = size % optimalPartSize
if size > MaxObjectSize && calcError == nil {
err += fmt.Sprintf("Testcase #%v size %v: size exceeds MaxObjectSize=%v but no error returned\n", index, size, MaxObjectSize)
}
if calcError == nil {
equalparts = size / optimalPartSize
lastpartsize = size % optimalPartSize
if optimalPartSize < MinPartSize {
err += fmt.Sprintf("Testcase #%v size %v, %v parts of size %v, lastpart %v: optimalPartSize < MinPartSize %v\n", index, size, equalparts, optimalPartSize, lastpartsize, MinPartSize)
}
if optimalPartSize > MaxPartSize {
if optimalPartSize > MaxPartSize && calcError == nil {
err += fmt.Sprintf("Testcase #%v size %v, %v parts of size %v, lastpart %v: optimalPartSize > MaxPartSize %v\n", index, size, equalparts, optimalPartSize, lastpartsize, MaxPartSize)
}
if size%optimalPartSize == 0 && equalparts > MaxMultipartParts {
@ -139,12 +136,13 @@ func TestCalcOptimalPartSize(t *testing.T) {
if lastpartsize > optimalPartSize {
err += fmt.Sprintf("Testcase #%v size %v, %v parts of size %v, lastpart %v: lastpart > optimalPartSize %v\n", index, size, equalparts, optimalPartSize, lastpartsize, optimalPartSize)
}
}
fmt.Printf("Testcase #%v size %v, %v parts of size %v, lastpart %v\n", index, size, equalparts, optimalPartSize, lastpartsize)
// fmt.Printf("Testcase #%v size %v, %v parts of size %v, lastpart %v\n", index, size, equalparts, optimalPartSize, lastpartsize)
if len(err) > 0 {
t.Errorf(err)
}
}
// fmt.Println("HighestApplicablePartSize", HighestApplicablePartSize)
// fmt.Println("RemainderWithHighestApplicablePartSize", RemainderWithHighestApplicablePartSize)
}
func TestNewUpload(t *testing.T) {