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return part of the chunk if chunkview is not the full chunk

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This commit is contained in:
Chris Lu
2020-03-29 00:54:39 -07:00
parent ae2309dc58
commit 057722bbf4
2 changed files with 32 additions and 16 deletions
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36
weed/filesys/reader_at.go
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@@ -102,34 +102,46 @@ func (c *ChunkReadAt) doReadAt(p []byte, offset int64) (n int, err error) {
}
func (c *ChunkReadAt) fetchChunkData(chunkView *filer2.ChunkView) ([]byte, error) {
func (c *ChunkReadAt) fetchChunkData(chunkView *filer2.ChunkView) (data []byte, err error) {
// fmt.Printf("fetching %s [%d,%d)\n", chunkView.FileId, chunkView.LogicOffset, chunkView.LogicOffset+int64(chunkView.Size))
chunkData := c.chunkCache.GetChunk(chunkView.FileId)
if chunkData != nil {
glog.V(3).Infof("cache hit %s [%d,%d)", chunkView.FileId, chunkView.LogicOffset, chunkView.LogicOffset+int64(chunkView.Size))
return chunkData, nil
} else {
chunkData, err = c.doFetchFullChunkData(chunkView.FileId, chunkView.CipherKey, chunkView.IsGzipped)
if err != nil {
return nil, err
}
}
urlString, err := c.lookupFileId(chunkView.FileId)
if int64(len(chunkData)) < chunkView.Offset+int64(chunkView.Size) {
return nil, fmt.Errorf("unexpected larger chunkView [%d,%d) than chunk %d", chunkView.Offset, chunkView.Offset+int64(chunkView.Size), len(chunkData))
}
data = chunkData[chunkView.Offset : chunkView.Offset+int64(chunkView.Size)]
c.chunkCache.SetChunk(chunkView.FileId, chunkData)
return data, nil
}
func (c *ChunkReadAt) doFetchFullChunkData(fileId string, cipherKey []byte, isGzipped bool) ([]byte, error) {
urlString, err := c.lookupFileId(fileId)
if err != nil {
glog.V(1).Infof("operation LookupFileId %s failed, err: %v", chunkView.FileId, err)
glog.V(1).Infof("operation LookupFileId %s failed, err: %v", fileId, err)
return nil, err
}
var buffer bytes.Buffer
err = util.ReadUrlAsStream(urlString, chunkView.CipherKey, chunkView.IsGzipped, chunkView.IsFullChunk, chunkView.Offset, int(chunkView.Size), func(data []byte) {
err = util.ReadUrlAsStream(urlString, cipherKey, isGzipped, true, 0, 0, func(data []byte) {
buffer.Write(data)
})
if err != nil {
glog.V(1).Infof("read %s failed, err: %v", chunkView.FileId, err)
glog.V(1).Infof("read %s failed, err: %v", fileId, err)
return nil, err
}
glog.V(3).Infof("read %s [%d,%d)", chunkView.FileId, chunkView.LogicOffset, chunkView.LogicOffset+int64(chunkView.Size))
chunkData = buffer.Bytes()
c.chunkCache.SetChunk(chunkView.FileId, chunkData)
return chunkData, nil
return buffer.Bytes(), nil
}