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package needle
import (
"bytes"
"fmt"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/storage/backend"
. "github.com/seaweedfs/seaweedfs/weed/storage/types"
"github.com/seaweedfs/seaweedfs/weed/util"
"math"
"sync"
)
var bufPool = sync.Pool{
New: func() interface{} {
return new(bytes.Buffer)
},
}
func (n *Needle) prepareWriteBuffer(version Version, writeBytes *bytes.Buffer) (Size, int64, error) {
writeBytes.Reset()
switch version {
case Version1:
header := make([]byte, NeedleHeaderSize)
CookieToBytes(header[0:CookieSize], n.Cookie)
NeedleIdToBytes(header[CookieSize:CookieSize+NeedleIdSize], n.Id)
n.Size = Size(len(n.Data))
SizeToBytes(header[CookieSize+NeedleIdSize:CookieSize+NeedleIdSize+SizeSize], n.Size)
size := n.Size
actualSize := NeedleHeaderSize + int64(n.Size)
writeBytes.Write(header)
writeBytes.Write(n.Data)
padding := PaddingLength(n.Size, version)
util.Uint32toBytes(header[0:NeedleChecksumSize], uint32(n.Checksum))
writeBytes.Write(header[0 : NeedleChecksumSize+padding])
return size, actualSize, nil
case Version2, Version3:
header := make([]byte, NeedleHeaderSize+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 + Size(n.DataSize) + 1
if n.HasName() {
n.Size = n.Size + 1 + Size(n.NameSize)
}
if n.HasMime() {
n.Size = n.Size + 1 + Size(n.MimeSize)
}
if n.HasLastModifiedDate() {
n.Size = n.Size + LastModifiedBytesLength
}
if n.HasTtl() {
n.Size = n.Size + TtlBytesLength
}
if n.HasPairs() {
n.Size += 2 + Size(n.PairsSize)
}
} else {
n.Size = 0
}
SizeToBytes(header[CookieSize+NeedleIdSize:CookieSize+NeedleIdSize+SizeSize], n.Size)
writeBytes.Write(header[0:NeedleHeaderSize])
if n.DataSize > 0 {
util.Uint32toBytes(header[0:4], n.DataSize)
writeBytes.Write(header[0:4])
writeBytes.Write(n.Data)
util.Uint8toBytes(header[0:1], n.Flags)
writeBytes.Write(header[0:1])
if n.HasName() {
util.Uint8toBytes(header[0:1], n.NameSize)
writeBytes.Write(header[0:1])
writeBytes.Write(n.Name[:n.NameSize])
}
if n.HasMime() {
util.Uint8toBytes(header[0:1], n.MimeSize)
writeBytes.Write(header[0:1])
writeBytes.Write(n.Mime)
}
if n.HasLastModifiedDate() {
util.Uint64toBytes(header[0:8], n.LastModified)
writeBytes.Write(header[8-LastModifiedBytesLength : 8])
}
if n.HasTtl() && n.Ttl != nil {
n.Ttl.ToBytes(header[0:TtlBytesLength])
writeBytes.Write(header[0:TtlBytesLength])
}
if n.HasPairs() {
util.Uint16toBytes(header[0:2], n.PairsSize)
writeBytes.Write(header[0:2])
writeBytes.Write(n.Pairs)
}
}
padding := PaddingLength(n.Size, version)
util.Uint32toBytes(header[0:NeedleChecksumSize], uint32(n.Checksum))
if version == Version2 {
writeBytes.Write(header[0 : NeedleChecksumSize+padding])
} else {
// version3
util.Uint64toBytes(header[NeedleChecksumSize:NeedleChecksumSize+TimestampSize], n.AppendAtNs)
writeBytes.Write(header[0 : NeedleChecksumSize+TimestampSize+padding])
}
return Size(n.DataSize), GetActualSize(n.Size, version), nil
}
return 0, 0, fmt.Errorf("Unsupported Version! (%d)", version)
}
func (n *Needle) Append(w backend.BackendStorageFile, version Version) (offset uint64, size Size, actualSize int64, err error) {
if end, _, e := w.GetStat(); e == nil {
defer func(w backend.BackendStorageFile, 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
}
if offset >= MaxPossibleVolumeSize && n.Size.IsValid() {
err = fmt.Errorf("Volume Size %d Exeededs %d", offset, MaxPossibleVolumeSize)
return
}
bytesBuffer := bufPool.Get().(*bytes.Buffer)
defer bufPool.Put(bytesBuffer)
size, actualSize, err = n.prepareWriteBuffer(version, bytesBuffer)
if err == nil {
_, err = w.WriteAt(bytesBuffer.Bytes(), int64(offset))
}
return offset, size, actualSize, err
}
func WriteNeedleBlob(w backend.BackendStorageFile, dataSlice []byte, size Size, appendAtNs uint64, version Version) (offset uint64, err error) {
if end, _, e := w.GetStat(); e == nil {
defer func(w backend.BackendStorageFile, 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
}
if version == Version3 {
tsOffset := NeedleHeaderSize + size + NeedleChecksumSize
util.Uint64toBytes(dataSlice[tsOffset:tsOffset+TimestampSize], appendAtNs)
}
if err == nil {
_, err = w.WriteAt(dataSlice, int64(offset))
}
return
}
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