func (m *master) sync() error {
logIndexStr := strconv.FormatInt(m.info.LogFileIndex, 10)
logPosStr := strconv.FormatInt(m.info.LogPos, 10)
cmd := ledis.Slice(fmt.Sprintf(syncCmdFormat, len(logIndexStr),
logIndexStr, len(logPosStr), logPosStr))
if _, err := m.conn.Write(cmd); err != nil {
return err
}
m.syncBuf.Reset()
err := ReadBulkTo(m.rb, &m.syncBuf)
if err != nil {
return err
}
var buf []byte
buf, err = snappy.Decode(m.compressBuf, m.syncBuf.Bytes())
if err != nil {
return err
} else if len(buf) > len(m.compressBuf) {
m.compressBuf = buf
}
if len(buf) < 16 {
return fmt.Errorf("invalid sync data len %d", len(buf))
}
m.info.LogFileIndex = int64(binary.BigEndian.Uint64(buf[0:8]))
m.info.LogPos = int64(binary.BigEndian.Uint64(buf[8:16]))
if m.info.LogFileIndex == 0 {
//master now not support binlog, stop replication
m.stopReplication()
return nil
} else if m.info.LogFileIndex == -1 {
//-1 means than binlog index and pos are lost, we must start a full sync instead
return m.fullSync()
}
err = m.app.ldb.ReplicateFromData(buf[16:])
if err != nil {
return err
}
return m.saveInfo()
}
func (l *Ledis) LoadDump(r io.Reader) (*MasterInfo, error) {
l.Lock()
defer l.Unlock()
info := new(MasterInfo)
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
}
if l.binlog != nil {
err = l.binlog.Log(encodeBinLogPut(key, value))
}
keyBuf.Reset()
valueBuf.Reset()
}
deKeyBuf = nil
deValueBuf = nil
return info, nil
}
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
}