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ChunkStreamReader implenents io.ReaderAt

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This commit is contained in:
Chris Lu 2021-08-07 15:41:07 -07:00
parent 59732a0529
commit de730b079d
1 changed files with 9 additions and 0 deletions
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9
weed/filer/stream.go
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@ -99,6 +99,7 @@ type ChunkStreamReader struct {
} }
var _ = io.ReadSeeker(&ChunkStreamReader{}) var _ = io.ReadSeeker(&ChunkStreamReader{})
var _ = io.ReaderAt(&ChunkStreamReader{})
func doNewChunkStreamReader(lookupFileIdFn wdclient.LookupFileIdFunctionType, chunks []*filer_pb.FileChunk) *ChunkStreamReader { func doNewChunkStreamReader(lookupFileIdFn wdclient.LookupFileIdFunctionType, chunks []*filer_pb.FileChunk) *ChunkStreamReader {
@ -135,6 +136,14 @@ func NewChunkStreamReader(filerClient filer_pb.FilerClient, chunks []*filer_pb.F
return doNewChunkStreamReader(lookupFileIdFn, chunks) return doNewChunkStreamReader(lookupFileIdFn, chunks)
} }
func (c *ChunkStreamReader) ReadAt(p []byte, off int64) (n int, err error) {
_, err = c.Seek(off, io.SeekStart)
if err != nil {
return
}
return c.Read(p)
}
func (c *ChunkStreamReader) Read(p []byte) (n int, err error) { func (c *ChunkStreamReader) Read(p []byte) (n int, err error) {
for n < len(p) { for n < len(p) {
if c.isBufferEmpty() { if c.isBufferEmpty() {