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chunk cache adds function ReadChunkAt

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This commit is contained in:
chrislu
2022-02-25 21:55:04 -08:00
parent fc7a4957ea
commit 3ad5fa6f6f
5 changed files with 125 additions and 9 deletions
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22
weed/util/chunk_cache/chunk_cache_on_disk.go
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@@ -144,6 +144,28 @@ func (v *ChunkCacheVolume) getNeedleSlice(key types.NeedleId, offset, length uin
return data, nil
}
func (v *ChunkCacheVolume) readNeedleSliceAt(data []byte, key types.NeedleId, offset uint64) (n int, err error) {
nv, ok := v.nm.Get(key)
if !ok {
return 0, storage.ErrorNotFound
}
wanted := min(len(data), int(nv.Size)-int(offset))
if wanted < 0 {
// should never happen, but better than panicing
return 0, ErrorOutOfBounds
}
if n, err = v.DataBackend.ReadAt(data, nv.Offset.ToActualOffset()+int64(offset)); err != nil {
return n, fmt.Errorf("read %s.dat [%d,%d): %v",
v.fileName, nv.Offset.ToActualOffset()+int64(offset), int(nv.Offset.ToActualOffset())+int(offset)+wanted, err)
} else {
if n != wanted {
return n, fmt.Errorf("read %d, expected %d", n, wanted)
}
}
return n, nil
}
func (v *ChunkCacheVolume) WriteNeedle(key types.NeedleId, data []byte) error {
offset := v.fileSize