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|
package nodb
import (
"bufio"
"bytes"
"encoding/binary"
"io"
"os"
"github.com/siddontang/go-snappy/snappy"
)
//dump format
// fileIndex(bigendian int64)|filePos(bigendian int64)
// |keylen(bigendian int32)|key|valuelen(bigendian int32)|value......
//
//key and value are both compressed for fast transfer dump on network using snappy
type BinLogAnchor struct {
LogFileIndex int64
LogPos int64
}
func (m *BinLogAnchor) WriteTo(w io.Writer) error {
if err := binary.Write(w, binary.BigEndian, m.LogFileIndex); err != nil {
return err
}
if err := binary.Write(w, binary.BigEndian, m.LogPos); err != nil {
return err
}
return nil
}
func (m *BinLogAnchor) ReadFrom(r io.Reader) error {
err := binary.Read(r, binary.BigEndian, &m.LogFileIndex)
if err != nil {
return err
}
err = binary.Read(r, binary.BigEndian, &m.LogPos)
if err != nil {
return err
}
return nil
}
func (l *Nodb) DumpFile(path string) error {
f, err := os.Create(path)
if err != nil {
return err
}
defer f.Close()
return l.Dump(f)
}
func (l *Nodb) Dump(w io.Writer) error {
m := new(BinLogAnchor)
var err error
l.wLock.Lock()
defer l.wLock.Unlock()
if l.binlog != nil {
m.LogFileIndex = l.binlog.LogFileIndex()
m.LogPos = l.binlog.LogFilePos()
}
wb := bufio.NewWriterSize(w, 4096)
if err = m.WriteTo(wb); err != nil {
return err
}
it := l.ldb.NewIterator()
it.SeekToFirst()
compressBuf := make([]byte, 4096)
var key []byte
var value []byte
for ; it.Valid(); it.Next() {
key = it.RawKey()
value = it.RawValue()
if key, err = snappy.Encode(compressBuf, key); err != nil {
return err
}
if err = binary.Write(wb, binary.BigEndian, uint16(len(key))); err != nil {
return err
}
if _, err = wb.Write(key); err != nil {
return err
}
if value, err = snappy.Encode(compressBuf, value); err != nil {
return err
}
if err = binary.Write(wb, binary.BigEndian, uint32(len(value))); err != nil {
return err
}
if _, err = wb.Write(value); err != nil {
return err
}
}
if err = wb.Flush(); err != nil {
return err
}
compressBuf = nil
return nil
}
func (l *Nodb) LoadDumpFile(path string) (*BinLogAnchor, error) {
f, err := os.Open(path)
if err != nil {
return nil, err
}
defer f.Close()
return l.LoadDump(f)
}
func (l *Nodb) LoadDump(r io.Reader) (*BinLogAnchor, error) {
l.wLock.Lock()
defer l.wLock.Unlock()
info := new(BinLogAnchor)
rb := bufio.NewReaderSize(r, 4096)
err := info.ReadFrom(rb)
if err != nil {
return nil, err
}
var keyLen uint16
var valueLen uint32
var keyBuf bytes.Buffer
var valueBuf bytes.Buffer
deKeyBuf := make([]byte, 4096)
deValueBuf := make([]byte, 4096)
var key, value []byte
for {
if err = binary.Read(rb, binary.BigEndian, &keyLen); err != nil && err != io.EOF {
return nil, err
} else if err == io.EOF {
break
}
if _, err = io.CopyN(&keyBuf, rb, int64(keyLen)); err != nil {
return nil, err
}
if key, err = snappy.Decode(deKeyBuf, keyBuf.Bytes()); err != nil {
return nil, err
}
if err = binary.Read(rb, binary.BigEndian, &valueLen); err != nil {
return nil, err
}
if _, err = io.CopyN(&valueBuf, rb, int64(valueLen)); err != nil {
return nil, err
}
if value, err = snappy.Decode(deValueBuf, valueBuf.Bytes()); err != nil {
return nil, err
}
if err = l.ldb.Put(key, value); err != nil {
return nil, err
}
keyBuf.Reset()
valueBuf.Reset()
}
deKeyBuf = nil
deValueBuf = nil
//if binlog enable, we will delete all binlogs and open a new one for handling simply
if l.binlog != nil {
l.binlog.PurgeAll()
}
return info, nil
}
|
