package storage import ( "errors" "fmt" "io" "os" "github.com/chrislusf/seaweedfs/weed/glog" . "github.com/chrislusf/seaweedfs/weed/storage/types" "github.com/chrislusf/seaweedfs/weed/util" "math" ) const ( FlagGzip = 0x01 FlagHasName = 0x02 FlagHasMime = 0x04 FlagHasLastModifiedDate = 0x08 FlagHasTtl = 0x10 FlagHasPairs = 0x20 FlagIsChunkManifest = 0x80 LastModifiedBytesLength = 5 TtlBytesLength = 2 ) func (n *Needle) DiskSize(version Version) int64 { return getActualSize(n.Size, version) } func (n *Needle) Append(w *os.File, version Version) (offset uint64, size uint32, actualSize int64, err error) { if end, e := w.Seek(0, io.SeekEnd); e == nil { defer func(w *os.File, off int64) { if err != nil { if te := w.Truncate(end); te != nil { glog.V(0).Infof("Failed to truncate %s back to %d with error: %v", w.Name(), end, te) } } }(w, end) offset = uint64(end) } else { err = fmt.Errorf("Cannot Read Current Volume Position: %v", e) return } switch version { case Version1: header := make([]byte, NeedleEntrySize) CookieToBytes(header[0:CookieSize], n.Cookie) NeedleIdToBytes(header[CookieSize:CookieSize+NeedleIdSize], n.Id) n.Size = uint32(len(n.Data)) size = n.Size util.Uint32toBytes(header[CookieSize+NeedleIdSize:CookieSize+NeedleIdSize+SizeSize], n.Size) if _, err = w.Write(header); err != nil { return } if _, err = w.Write(n.Data); err != nil { return } actualSize = NeedleEntrySize + int64(n.Size) padding := PaddingLength(n.Size, version) util.Uint32toBytes(header[0:NeedleChecksumSize], n.Checksum.Value()) _, err = w.Write(header[0 : NeedleChecksumSize+padding]) return case Version2, Version3: header := make([]byte, NeedleEntrySize+TimestampSize) // adding timestamp to reuse it and avoid extra allocation CookieToBytes(header[0:CookieSize], n.Cookie) NeedleIdToBytes(header[CookieSize:CookieSize+NeedleIdSize], n.Id) if len(n.Name) >= math.MaxUint8 { n.NameSize = math.MaxUint8 } else { n.NameSize = uint8(len(n.Name)) } n.DataSize, n.MimeSize = uint32(len(n.Data)), uint8(len(n.Mime)) if n.DataSize > 0 { n.Size = 4 + n.DataSize + 1 if n.HasName() { n.Size = n.Size + 1 + uint32(n.NameSize) } if n.HasMime() { n.Size = n.Size + 1 + uint32(n.MimeSize) } if n.HasLastModifiedDate() { n.Size = n.Size + LastModifiedBytesLength } if n.HasTtl() { n.Size = n.Size + TtlBytesLength } if n.HasPairs() { n.Size += 2 + uint32(n.PairsSize) } } else { n.Size = 0 } size = n.DataSize util.Uint32toBytes(header[CookieSize+NeedleIdSize:CookieSize+NeedleIdSize+SizeSize], n.Size) if _, err = w.Write(header[0:NeedleEntrySize]); err != nil { return } if n.DataSize > 0 { util.Uint32toBytes(header[0:4], n.DataSize) if _, err = w.Write(header[0:4]); err != nil { return } if _, err = w.Write(n.Data); err != nil { return } util.Uint8toBytes(header[0:1], n.Flags) if _, err = w.Write(header[0:1]); err != nil { return } if n.HasName() { util.Uint8toBytes(header[0:1], n.NameSize) if _, err = w.Write(header[0:1]); err != nil { return } if _, err = w.Write(n.Name[:n.NameSize]); err != nil { return } } if n.HasMime() { util.Uint8toBytes(header[0:1], n.MimeSize) if _, err = w.Write(header[0:1]); err != nil { return } if _, err = w.Write(n.Mime); err != nil { return } } if n.HasLastModifiedDate() { util.Uint64toBytes(header[0:8], n.LastModified) if _, err = w.Write(header[8-LastModifiedBytesLength : 8]); err != nil { return } } if n.HasTtl() && n.Ttl != nil { n.Ttl.ToBytes(header[0:TtlBytesLength]) if _, err = w.Write(header[0:TtlBytesLength]); err != nil { return } } if n.HasPairs() { util.Uint16toBytes(header[0:2], n.PairsSize) if _, err = w.Write(header[0:2]); err != nil { return } if _, err = w.Write(n.Pairs); err != nil { return } } } padding := PaddingLength(n.Size, version) util.Uint32toBytes(header[0:NeedleChecksumSize], n.Checksum.Value()) if version == Version2 { _, err = w.Write(header[0 : NeedleChecksumSize+padding]) } else { // version3 util.Uint64toBytes(header[NeedleChecksumSize:NeedleChecksumSize+TimestampSize], n.AppendAtNs) _, err = w.Write(header[0 : NeedleChecksumSize+TimestampSize+padding]) } return offset, n.DataSize, getActualSize(n.Size, version), err } return 0, 0, 0, fmt.Errorf("Unsupported Version! (%d)", version) } func ReadNeedleBlob(r *os.File, offset int64, size uint32, version Version) (dataSlice []byte, err error) { dataSlice = make([]byte, int(getActualSize(size, version))) _, err = r.ReadAt(dataSlice, offset) return dataSlice, err } func (n *Needle) ReadData(r *os.File, offset int64, size uint32, version Version) (err error) { bytes, err := ReadNeedleBlob(r, offset, size, version) if err != nil { return err } n.ParseNeedleHeader(bytes) if n.Size != size { return fmt.Errorf("File Entry Not Found. offset %d, Needle id %d expected size %d Memory %d", offset, n.Id, n.Size, size) } switch version { case Version1: n.Data = bytes[NeedleEntrySize : NeedleEntrySize+size] case Version2, Version3: n.readNeedleDataVersion2(bytes[NeedleEntrySize : NeedleEntrySize+int(n.Size)]) } if size == 0 { return nil } checksum := util.BytesToUint32(bytes[NeedleEntrySize+size : NeedleEntrySize+size+NeedleChecksumSize]) newChecksum := NewCRC(n.Data) if checksum != newChecksum.Value() { return errors.New("CRC error! Data On Disk Corrupted") } n.Checksum = newChecksum if version == Version3 { tsOffset := NeedleEntrySize + size + NeedleChecksumSize n.AppendAtNs = util.BytesToUint64(bytes[tsOffset : tsOffset+TimestampSize]) } return nil } func (n *Needle) ParseNeedleHeader(bytes []byte) { n.Cookie = BytesToCookie(bytes[0:CookieSize]) n.Id = BytesToNeedleId(bytes[CookieSize : CookieSize+NeedleIdSize]) n.Size = util.BytesToUint32(bytes[CookieSize+NeedleIdSize : NeedleEntrySize]) } func (n *Needle) readNeedleDataVersion2(bytes []byte) { index, lenBytes := 0, len(bytes) if index < lenBytes { n.DataSize = util.BytesToUint32(bytes[index : index+4]) index = index + 4 if int(n.DataSize)+index > lenBytes { // this if clause is due to bug #87 and #93, fixed in v0.69 // remove this clause later return } n.Data = bytes[index : index+int(n.DataSize)] index = index + int(n.DataSize) n.Flags = bytes[index] index = index + 1 } if index < lenBytes && n.HasName() { n.NameSize = uint8(bytes[index]) index = index + 1 n.Name = bytes[index : index+int(n.NameSize)] index = index + int(n.NameSize) } if index < lenBytes && n.HasMime() { n.MimeSize = uint8(bytes[index]) index = index + 1 n.Mime = bytes[index : index+int(n.MimeSize)] index = index + int(n.MimeSize) } if index < lenBytes && n.HasLastModifiedDate() { n.LastModified = util.BytesToUint64(bytes[index : index+LastModifiedBytesLength]) index = index + LastModifiedBytesLength } if index < lenBytes && n.HasTtl() { n.Ttl = LoadTTLFromBytes(bytes[index : index+TtlBytesLength]) index = index + TtlBytesLength } if index < lenBytes && n.HasPairs() { n.PairsSize = util.BytesToUint16(bytes[index : index+2]) index += 2 end := index + int(n.PairsSize) n.Pairs = bytes[index:end] index = end } } func ReadNeedleHeader(r *os.File, version Version, offset int64) (n *Needle, bodyLength int64, err error) { n = new(Needle) if version == Version1 || version == Version2 || version == Version3 { bytes := make([]byte, NeedleEntrySize) var count int count, err = r.ReadAt(bytes, offset) if count <= 0 || err != nil { return nil, 0, err } n.ParseNeedleHeader(bytes) bodyLength = NeedleBodyLength(n.Size, version) } return } func PaddingLength(needleSize uint32, version Version) uint32 { if version == Version3 { // this is same value as version2, but just listed here for clarity return NeedlePaddingSize - ((NeedleEntrySize + needleSize + NeedleChecksumSize + TimestampSize) % NeedlePaddingSize) } return NeedlePaddingSize - ((NeedleEntrySize + needleSize + NeedleChecksumSize) % NeedlePaddingSize) } func NeedleBodyLength(needleSize uint32, version Version) int64 { if version == Version3 { return int64(needleSize) + NeedleChecksumSize + TimestampSize + int64(PaddingLength(needleSize, version)) } return int64(needleSize) + NeedleChecksumSize + int64(PaddingLength(needleSize, version)) } //n should be a needle already read the header //the input stream will read until next file entry func (n *Needle) ReadNeedleBody(r *os.File, version Version, offset int64, bodyLength int64) (err error) { if bodyLength <= 0 { return nil } switch version { case Version1: bytes := make([]byte, bodyLength) if _, err = r.ReadAt(bytes, offset); err != nil { return } n.Data = bytes[:n.Size] n.Checksum = NewCRC(n.Data) case Version2, Version3: bytes := make([]byte, bodyLength) if _, err = r.ReadAt(bytes, offset); err != nil { return } n.readNeedleDataVersion2(bytes[0:n.Size]) n.Checksum = NewCRC(n.Data) default: err = fmt.Errorf("Unsupported Version! (%d)", version) } return } func (n *Needle) IsGzipped() bool { return n.Flags&FlagGzip > 0 } func (n *Needle) SetGzipped() { n.Flags = n.Flags | FlagGzip } func (n *Needle) HasName() bool { return n.Flags&FlagHasName > 0 } func (n *Needle) SetHasName() { n.Flags = n.Flags | FlagHasName } func (n *Needle) HasMime() bool { return n.Flags&FlagHasMime > 0 } func (n *Needle) SetHasMime() { n.Flags = n.Flags | FlagHasMime } func (n *Needle) HasLastModifiedDate() bool { return n.Flags&FlagHasLastModifiedDate > 0 } func (n *Needle) SetHasLastModifiedDate() { n.Flags = n.Flags | FlagHasLastModifiedDate } func (n *Needle) HasTtl() bool { return n.Flags&FlagHasTtl > 0 } func (n *Needle) SetHasTtl() { n.Flags = n.Flags | FlagHasTtl } func (n *Needle) IsChunkedManifest() bool { return n.Flags&FlagIsChunkManifest > 0 } func (n *Needle) SetIsChunkManifest() { n.Flags = n.Flags | FlagIsChunkManifest } func (n *Needle) HasPairs() bool { return n.Flags&FlagHasPairs != 0 } func (n *Needle) SetHasPairs() { n.Flags = n.Flags | FlagHasPairs }