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blobserver: add WholeRefFetcher interface 

Change-Id: I5807918b9e362b098d6633f6c25e94f719cf4104
This commit is contained in:
Brad Fitzpatrick 2015-02-04 21:03:08 -08:00
parent 3e84782750
commit 73063c70ab
1 changed files with 15 additions and 0 deletions
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15
pkg/blobserver/interface.go
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@ -195,6 +195,21 @@ type ShutdownStorage interface {
io.Closer
}
// WholeRefFetcher is an optional fast-path interface exposed by the
// 'blobpacked' blob storage implementation, which packs pieces of
// files together and can efficiently serve them contigously.
type WholeRefFetcher interface {
// OpenWholeRef returns a ReadCloser reading from offset bytes
// into wholeRef (the blobref of an entire file).
//
// The returned wholeSize is the size of the file, without
// subtracting any offset.
//
// The err will be os.ErrNotExist if the wholeref is not
// known.OpenWholeRef
OpenWholeRef(wholeRef blob.Ref, offset int64) (rc io.ReadCloser, wholeSize int64, err error)
}
// A GenerationNotSupportedError explains why a Storage
// value implemented the Generationer interface but failed due
// to a wrapped Storage value not implementing the interface.