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Azure backend: limit http concurrency in Stat(), Test(), Remove()

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as per discussion in PR #1399
This commit is contained in:
George Armhold 2017-10-31 07:32:30 -04:00
parent d01d07fc0a
commit 981752ade0
1 changed files with 17 additions and 2 deletions
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19
internal/backend/azure/azure.go
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@ -227,13 +227,17 @@ func (be *Backend) Load(ctx context.Context, h restic.Handle, length int, offset
}
// Stat returns information about a blob.
func (be *Backend) Stat(ctx context.Context, h restic.Handle) (bi restic.FileInfo, err error) {
func (be *Backend) Stat(ctx context.Context, h restic.Handle) (restic.FileInfo, error) {
debug.Log("%v", h)
objName := be.Filename(h)
blob := be.container.GetBlobReference(objName)
if err := blob.GetProperties(nil); err != nil {
be.sem.GetToken()
err := blob.GetProperties(nil)
be.sem.ReleaseToken()
if err != nil {
debug.Log("blob.GetProperties err %v", err)
return restic.FileInfo{}, errors.Wrap(err, "blob.GetProperties")
}
@ -244,7 +248,11 @@ func (be *Backend) Stat(ctx context.Context, h restic.Handle) (bi restic.FileInf
// Test returns true if a blob of the given type and name exists in the backend.
func (be *Backend) Test(ctx context.Context, h restic.Handle) (bool, error) {
objName := be.Filename(h)
be.sem.GetToken()
found, err := be.container.GetBlobReference(objName).Exists()
be.sem.ReleaseToken()
if err != nil {
return false, err
}
@ -254,7 +262,11 @@ func (be *Backend) Test(ctx context.Context, h restic.Handle) (bool, error) {
// Remove removes the blob with the given name and type.
func (be *Backend) Remove(ctx context.Context, h restic.Handle) error {
objName := be.Filename(h)
be.sem.GetToken()
_, err := be.container.GetBlobReference(objName).DeleteIfExists(nil)
be.sem.ReleaseToken()
debug.Log("Remove(%v) at %v -> err %v", h, objName, err)
return errors.Wrap(err, "client.RemoveObject")
}
@ -282,7 +294,10 @@ func (be *Backend) List(ctx context.Context, t restic.FileType) <-chan string {
defer close(ch)
for {
be.sem.GetToken()
obj, err := be.container.ListBlobs(params)
be.sem.ReleaseToken()
if err != nil {
return
}