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package needle
import (
"errors"
"github.com/seaweedfs/seaweedfs/weed/stats"
. "github.com/seaweedfs/seaweedfs/weed/storage/types"
"github.com/seaweedfs/seaweedfs/weed/util"
)
func (n *Needle) readNeedleTail(needleBody []byte, version Version) error {
// for all versions, we need to read the checksum
if len(n.Data) > 0 {
expectedChecksum := CRC(util.BytesToUint32(needleBody[0:NeedleChecksumSize]))
dataChecksum := NewCRC(n.Data)
if expectedChecksum != dataChecksum {
// the crc.Value() function is to be deprecated. this double checking is for backward compatibility
// with seaweed version using crc.Value() instead of uint32(crc), which appears in commit 056c480eb
// and switch appeared in version 3.09.
stats.VolumeServerHandlerCounter.WithLabelValues(stats.ErrorCRC).Inc()
return errors.New("CRC error! Data On Disk Corrupted")
}
n.Checksum = dataChecksum
} else {
// when data is skipped from reading, just read the checksum
n.Checksum = CRC(util.BytesToUint32(needleBody[0:NeedleChecksumSize]))
}
if version == Version3 {
tsOffset := NeedleChecksumSize
n.AppendAtNs = util.BytesToUint64(needleBody[tsOffset : tsOffset+TimestampSize])
}
return nil
}
func PaddingLength(needleSize Size, version Version) Size {
if version == Version3 {
// this is same value as version2, but just listed here for clarity
return NeedlePaddingSize - ((NeedleHeaderSize + needleSize + NeedleChecksumSize + TimestampSize) % NeedlePaddingSize)
}
return NeedlePaddingSize - ((NeedleHeaderSize + needleSize + NeedleChecksumSize) % NeedlePaddingSize)
}
func NeedleBodyLength(needleSize Size, version Version) int64 {
if version == Version3 {
return int64(needleSize) + NeedleChecksumSize + TimestampSize + int64(PaddingLength(needleSize, version))
}
return int64(needleSize) + NeedleChecksumSize + int64(PaddingLength(needleSize, version))
}
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