mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-11-27 04:39:25 +08:00
396 lines
12 KiB
Go
396 lines
12 KiB
Go
package needle
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import (
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"errors"
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"fmt"
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"io"
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"math"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/storage/backend"
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. "github.com/chrislusf/seaweedfs/weed/storage/types"
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"github.com/chrislusf/seaweedfs/weed/util"
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)
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const (
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FlagIsCompressed = 0x01
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FlagHasName = 0x02
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FlagHasMime = 0x04
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FlagHasLastModifiedDate = 0x08
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FlagHasTtl = 0x10
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FlagHasPairs = 0x20
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FlagIsChunkManifest = 0x80
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LastModifiedBytesLength = 5
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TtlBytesLength = 2
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)
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func (n *Needle) DiskSize(version Version) int64 {
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return GetActualSize(n.Size, version)
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}
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func (n *Needle) prepareWriteBuffer(version Version) ([]byte, Size, int64, error) {
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writeBytes := make([]byte, 0)
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switch version {
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case Version1:
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header := make([]byte, NeedleHeaderSize)
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CookieToBytes(header[0:CookieSize], n.Cookie)
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NeedleIdToBytes(header[CookieSize:CookieSize+NeedleIdSize], n.Id)
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n.Size = Size(len(n.Data))
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SizeToBytes(header[CookieSize+NeedleIdSize:CookieSize+NeedleIdSize+SizeSize], n.Size)
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size := n.Size
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actualSize := NeedleHeaderSize + int64(n.Size)
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writeBytes = append(writeBytes, header...)
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writeBytes = append(writeBytes, n.Data...)
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padding := PaddingLength(n.Size, version)
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util.Uint32toBytes(header[0:NeedleChecksumSize], n.Checksum.Value())
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writeBytes = append(writeBytes, header[0:NeedleChecksumSize+padding]...)
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return writeBytes, size, actualSize, nil
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case Version2, Version3:
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header := make([]byte, NeedleHeaderSize+TimestampSize) // adding timestamp to reuse it and avoid extra allocation
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CookieToBytes(header[0:CookieSize], n.Cookie)
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NeedleIdToBytes(header[CookieSize:CookieSize+NeedleIdSize], n.Id)
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if len(n.Name) >= math.MaxUint8 {
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n.NameSize = math.MaxUint8
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} else {
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n.NameSize = uint8(len(n.Name))
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}
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n.DataSize, n.MimeSize = uint32(len(n.Data)), uint8(len(n.Mime))
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if n.DataSize > 0 {
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n.Size = 4 + Size(n.DataSize) + 1
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if n.HasName() {
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n.Size = n.Size + 1 + Size(n.NameSize)
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}
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if n.HasMime() {
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n.Size = n.Size + 1 + Size(n.MimeSize)
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}
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if n.HasLastModifiedDate() {
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n.Size = n.Size + LastModifiedBytesLength
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}
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if n.HasTtl() {
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n.Size = n.Size + TtlBytesLength
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}
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if n.HasPairs() {
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n.Size += 2 + Size(n.PairsSize)
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}
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} else {
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n.Size = 0
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}
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SizeToBytes(header[CookieSize+NeedleIdSize:CookieSize+NeedleIdSize+SizeSize], n.Size)
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writeBytes = append(writeBytes, header[0:NeedleHeaderSize]...)
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if n.DataSize > 0 {
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util.Uint32toBytes(header[0:4], n.DataSize)
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writeBytes = append(writeBytes, header[0:4]...)
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writeBytes = append(writeBytes, n.Data...)
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util.Uint8toBytes(header[0:1], n.Flags)
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writeBytes = append(writeBytes, header[0:1]...)
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if n.HasName() {
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util.Uint8toBytes(header[0:1], n.NameSize)
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writeBytes = append(writeBytes, header[0:1]...)
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writeBytes = append(writeBytes, n.Name[:n.NameSize]...)
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}
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if n.HasMime() {
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util.Uint8toBytes(header[0:1], n.MimeSize)
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writeBytes = append(writeBytes, header[0:1]...)
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writeBytes = append(writeBytes, n.Mime...)
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}
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if n.HasLastModifiedDate() {
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util.Uint64toBytes(header[0:8], n.LastModified)
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writeBytes = append(writeBytes, header[8-LastModifiedBytesLength:8]...)
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}
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if n.HasTtl() && n.Ttl != nil {
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n.Ttl.ToBytes(header[0:TtlBytesLength])
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writeBytes = append(writeBytes, header[0:TtlBytesLength]...)
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}
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if n.HasPairs() {
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util.Uint16toBytes(header[0:2], n.PairsSize)
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writeBytes = append(writeBytes, header[0:2]...)
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writeBytes = append(writeBytes, n.Pairs...)
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}
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}
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padding := PaddingLength(n.Size, version)
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util.Uint32toBytes(header[0:NeedleChecksumSize], n.Checksum.Value())
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if version == Version2 {
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writeBytes = append(writeBytes, header[0:NeedleChecksumSize+padding]...)
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} else {
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// version3
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util.Uint64toBytes(header[NeedleChecksumSize:NeedleChecksumSize+TimestampSize], n.AppendAtNs)
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writeBytes = append(writeBytes, header[0:NeedleChecksumSize+TimestampSize+padding]...)
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}
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return writeBytes, Size(n.DataSize), GetActualSize(n.Size, version), nil
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}
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return writeBytes, 0, 0, fmt.Errorf("Unsupported Version! (%d)", version)
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}
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func (n *Needle) Append(w backend.BackendStorageFile, version Version) (offset uint64, size Size, actualSize int64, err error) {
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if end, _, e := w.GetStat(); e == nil {
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defer func(w backend.BackendStorageFile, off int64) {
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if err != nil {
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if te := w.Truncate(end); te != nil {
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glog.V(0).Infof("Failed to truncate %s back to %d with error: %v", w.Name(), end, te)
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}
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}
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}(w, end)
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offset = uint64(end)
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} else {
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err = fmt.Errorf("Cannot Read Current Volume Position: %v", e)
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return
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}
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if offset >= MaxPossibleVolumeSize {
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err = fmt.Errorf("Volume Size %d Exeededs %d", offset, MaxPossibleVolumeSize)
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return
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}
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bytesToWrite, size, actualSize, err := n.prepareWriteBuffer(version)
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if err == nil {
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_, err = w.WriteAt(bytesToWrite, int64(offset))
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}
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return offset, size, actualSize, err
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}
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func ReadNeedleBlob(r backend.BackendStorageFile, offset int64, size Size, version Version) (dataSlice []byte, err error) {
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dataSize := GetActualSize(size, version)
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dataSlice = make([]byte, int(dataSize))
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_, err = r.ReadAt(dataSlice, offset)
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return dataSlice, err
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}
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// ReadBytes hydrates the needle from the bytes buffer, with only n.Id is set.
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func (n *Needle) ReadBytes(bytes []byte, offset int64, size Size, version Version) (err error) {
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n.ParseNeedleHeader(bytes)
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if n.Size != size {
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return fmt.Errorf("entry not found: offset %d found id %x size %d, expected size %d", offset, n.Id, n.Size, size)
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}
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switch version {
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case Version1:
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n.Data = bytes[NeedleHeaderSize : NeedleHeaderSize+size]
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case Version2, Version3:
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err = n.readNeedleDataVersion2(bytes[NeedleHeaderSize : NeedleHeaderSize+int(n.Size)])
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}
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if err != nil && err != io.EOF {
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return err
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}
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if size > 0 {
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checksum := util.BytesToUint32(bytes[NeedleHeaderSize+size : NeedleHeaderSize+size+NeedleChecksumSize])
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newChecksum := NewCRC(n.Data)
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if checksum != newChecksum.Value() {
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return errors.New("CRC error! Data On Disk Corrupted")
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}
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n.Checksum = newChecksum
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}
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if version == Version3 {
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tsOffset := NeedleHeaderSize + size + NeedleChecksumSize
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n.AppendAtNs = util.BytesToUint64(bytes[tsOffset : tsOffset+TimestampSize])
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}
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return nil
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}
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// ReadData hydrates the needle from the file, with only n.Id is set.
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func (n *Needle) ReadData(r backend.BackendStorageFile, offset int64, size Size, version Version) (err error) {
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bytes, err := ReadNeedleBlob(r, offset, size, version)
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if err != nil {
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return err
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}
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return n.ReadBytes(bytes, offset, size, version)
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}
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func (n *Needle) ParseNeedleHeader(bytes []byte) {
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n.Cookie = BytesToCookie(bytes[0:CookieSize])
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n.Id = BytesToNeedleId(bytes[CookieSize : CookieSize+NeedleIdSize])
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n.Size = BytesToSize(bytes[CookieSize+NeedleIdSize : NeedleHeaderSize])
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}
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func (n *Needle) readNeedleDataVersion2(bytes []byte) (err error) {
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index, lenBytes := 0, len(bytes)
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if index < lenBytes {
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n.DataSize = util.BytesToUint32(bytes[index : index+4])
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index = index + 4
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if int(n.DataSize)+index > lenBytes {
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return fmt.Errorf("index out of range %d", 1)
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}
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n.Data = bytes[index : index+int(n.DataSize)]
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index = index + int(n.DataSize)
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n.Flags = bytes[index]
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index = index + 1
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}
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if index < lenBytes && n.HasName() {
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n.NameSize = uint8(bytes[index])
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index = index + 1
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if int(n.NameSize)+index > lenBytes {
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return fmt.Errorf("index out of range %d", 2)
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}
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n.Name = bytes[index : index+int(n.NameSize)]
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index = index + int(n.NameSize)
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}
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if index < lenBytes && n.HasMime() {
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n.MimeSize = uint8(bytes[index])
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index = index + 1
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if int(n.MimeSize)+index > lenBytes {
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return fmt.Errorf("index out of range %d", 3)
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}
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n.Mime = bytes[index : index+int(n.MimeSize)]
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index = index + int(n.MimeSize)
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}
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if index < lenBytes && n.HasLastModifiedDate() {
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if LastModifiedBytesLength+index > lenBytes {
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return fmt.Errorf("index out of range %d", 4)
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}
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n.LastModified = util.BytesToUint64(bytes[index : index+LastModifiedBytesLength])
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index = index + LastModifiedBytesLength
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}
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if index < lenBytes && n.HasTtl() {
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if TtlBytesLength+index > lenBytes {
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return fmt.Errorf("index out of range %d", 5)
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}
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n.Ttl = LoadTTLFromBytes(bytes[index : index+TtlBytesLength])
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index = index + TtlBytesLength
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}
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if index < lenBytes && n.HasPairs() {
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if 2+index > lenBytes {
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return fmt.Errorf("index out of range %d", 6)
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}
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n.PairsSize = util.BytesToUint16(bytes[index : index+2])
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index += 2
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if int(n.PairsSize)+index > lenBytes {
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return fmt.Errorf("index out of range %d", 7)
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}
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end := index + int(n.PairsSize)
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n.Pairs = bytes[index:end]
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index = end
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}
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return nil
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}
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func ReadNeedleHeader(r backend.BackendStorageFile, version Version, offset int64) (n *Needle, bytes []byte, bodyLength int64, err error) {
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n = new(Needle)
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if version == Version1 || version == Version2 || version == Version3 {
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bytes = make([]byte, NeedleHeaderSize)
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var count int
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count, err = r.ReadAt(bytes, offset)
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if count <= 0 || err != nil {
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return nil, bytes, 0, err
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}
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n.ParseNeedleHeader(bytes)
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bodyLength = NeedleBodyLength(n.Size, version)
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}
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return
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}
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func PaddingLength(needleSize Size, version Version) Size {
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if version == Version3 {
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// this is same value as version2, but just listed here for clarity
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return NeedlePaddingSize - ((NeedleHeaderSize + needleSize + NeedleChecksumSize + TimestampSize) % NeedlePaddingSize)
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}
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return NeedlePaddingSize - ((NeedleHeaderSize + needleSize + NeedleChecksumSize) % NeedlePaddingSize)
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}
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func NeedleBodyLength(needleSize Size, version Version) int64 {
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if version == Version3 {
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return int64(needleSize) + NeedleChecksumSize + TimestampSize + int64(PaddingLength(needleSize, version))
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}
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return int64(needleSize) + NeedleChecksumSize + int64(PaddingLength(needleSize, version))
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}
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//n should be a needle already read the header
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//the input stream will read until next file entry
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func (n *Needle) ReadNeedleBody(r backend.BackendStorageFile, version Version, offset int64, bodyLength int64) (bytes []byte, err error) {
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if bodyLength <= 0 {
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return nil, nil
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}
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bytes = make([]byte, bodyLength)
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if _, err = r.ReadAt(bytes, offset); err != nil {
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return
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}
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err = n.ReadNeedleBodyBytes(bytes, version)
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return
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}
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func (n *Needle) ReadNeedleBodyBytes(needleBody []byte, version Version) (err error) {
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if len(needleBody) <= 0 {
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return nil
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}
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switch version {
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case Version1:
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n.Data = needleBody[:n.Size]
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n.Checksum = NewCRC(n.Data)
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case Version2, Version3:
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err = n.readNeedleDataVersion2(needleBody[0:n.Size])
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n.Checksum = NewCRC(n.Data)
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if version == Version3 {
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tsOffset := n.Size + NeedleChecksumSize
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n.AppendAtNs = util.BytesToUint64(needleBody[tsOffset : tsOffset+TimestampSize])
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}
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default:
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err = fmt.Errorf("unsupported version %d!", version)
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}
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return
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}
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func (n *Needle) IsCompressed() bool {
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return n.Flags&FlagIsCompressed > 0
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}
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func (n *Needle) SetIsCompressed() {
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n.Flags = n.Flags | FlagIsCompressed
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}
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func (n *Needle) HasName() bool {
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return n.Flags&FlagHasName > 0
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}
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func (n *Needle) SetHasName() {
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n.Flags = n.Flags | FlagHasName
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}
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func (n *Needle) HasMime() bool {
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return n.Flags&FlagHasMime > 0
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}
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func (n *Needle) SetHasMime() {
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n.Flags = n.Flags | FlagHasMime
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}
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func (n *Needle) HasLastModifiedDate() bool {
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return n.Flags&FlagHasLastModifiedDate > 0
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}
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func (n *Needle) SetHasLastModifiedDate() {
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n.Flags = n.Flags | FlagHasLastModifiedDate
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}
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func (n *Needle) HasTtl() bool {
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return n.Flags&FlagHasTtl > 0
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}
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func (n *Needle) SetHasTtl() {
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n.Flags = n.Flags | FlagHasTtl
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}
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func (n *Needle) IsChunkedManifest() bool {
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return n.Flags&FlagIsChunkManifest > 0
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}
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func (n *Needle) SetIsChunkManifest() {
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n.Flags = n.Flags | FlagIsChunkManifest
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}
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func (n *Needle) HasPairs() bool {
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return n.Flags&FlagHasPairs != 0
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}
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func (n *Needle) SetHasPairs() {
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n.Flags = n.Flags | FlagHasPairs
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}
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func GetActualSize(size Size, version Version) int64 {
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return NeedleHeaderSize + NeedleBodyLength(size, version)
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}
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