mirror of
https://github.com/chrislusf/seaweedfs
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48 lines
1.3 KiB
Go
48 lines
1.3 KiB
Go
package needle
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import (
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"io"
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"github.com/seaweedfs/seaweedfs/weed/glog"
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"github.com/seaweedfs/seaweedfs/weed/storage/backend"
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. "github.com/seaweedfs/seaweedfs/weed/storage/types"
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)
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// ReadNeedleData uses a needle without n.Data to read the content
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// volumeOffset: the offset within the volume
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// needleOffset: the offset within the needle Data
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func (n *Needle) ReadNeedleData(r backend.BackendStorageFile, volumeOffset int64, data []byte, needleOffset int64) (count int, err error) {
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sizeToRead := min(int64(len(data)), int64(n.DataSize)-needleOffset)
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if sizeToRead <= 0 {
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return 0, io.EOF
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}
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startOffset := volumeOffset + NeedleHeaderSize + DataSizeSize + needleOffset
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count, err = r.ReadAt(data[:sizeToRead], startOffset)
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if err == io.EOF && int64(count) == sizeToRead {
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err = nil
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}
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if err != nil {
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fileSize, _, _ := r.GetStat()
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glog.Errorf("%s read %d %d size %d at offset %d fileSize %d: %v", r.Name(), n.Id, needleOffset, sizeToRead, volumeOffset, fileSize, err)
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}
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return
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}
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// ReadNeedleMeta fills all metadata except the n.Data
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func (n *Needle) ReadNeedleMeta(r backend.BackendStorageFile, offset int64, size Size, version Version) error {
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return n.ReadFromFile(r, offset, size, version, NeedleReadOptions{
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ReadHeader: true,
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ReadMeta: true,
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ReadData: false,
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})
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}
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func min(x, y int64) int64 {
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if x < y {
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return x
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}
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return y
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}
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