func parseMigrateDB(c *client, arg []byte) (uint64, error) {
db, err := ledis.StrUint64(arg, nil)
if err != nil {
return 0, err
} else if db >= uint64(c.app.cfg.Databases) {
return 0, fmt.Errorf("invalid db index %d, must < %d", db, c.app.cfg.Databases)
}
return db, nil
}
func syncCommand(c *client) error {
args := c.args
if len(args) != 1 {
return ErrCmdParams
}
var logId uint64
var err error
if logId, err = ledis.StrUint64(args[0], nil); err != nil {
return ErrCmdParams
}
lastLogID := logId - 1
stat, err := c.app.ldb.ReplicationStat()
if err != nil {
return err
}
if lastLogID > stat.LastID {
return fmt.Errorf("invalid sync logid %d > %d + 1", logId, stat.LastID)
}
c.lastLogID.Set(lastLogID)
if lastLogID == stat.LastID {
c.app.slaveAck(c)
}
c.syncBuf.Reset()
c.syncBuf.Write(dummyBuf)
if _, _, err := c.app.ldb.ReadLogsToTimeout(logId, &c.syncBuf, 1, c.app.quit); err != nil {
return err
} else {
buf := c.syncBuf.Bytes()
stat, err = c.app.ldb.ReplicationStat()
if err != nil {
return err
}
binary.BigEndian.PutUint64(buf, stat.LastID)
c.resp.writeBulk(buf)
}
return nil
}