func main() {
flag.Parse()
servenv.Init()
defer servenv.Close()
keyRange, err := key.ParseKeyRangeParts(*start, *end)
if err != nil {
log.Fatalf("Invalid key range: %v", err)
}
if *dbConfigFile == "" {
log.Fatalf("Cannot start without db-config-file")
}
dbConfig, err := readDbConfig(*dbConfigFile)
if err != nil {
log.Fatalf("Cannot read db config file: %v", err)
}
var t []string
if *tables != "" {
t = strings.Split(*tables, ",")
for i, table := range t {
t[i] = strings.TrimSpace(table)
}
}
interrupted := make(chan struct{})
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGTERM)
go func() {
for _ = range c {
close(interrupted)
}
}()
var vtClient mysqlctl.VtClient
vtClient = mysqlctl.NewDbClient(dbConfig)
err = vtClient.Connect()
if err != nil {
log.Fatalf("error in initializing dbClient: %v", err)
}
brs, err := mysqlctl.ReadStartPosition(vtClient, uint32(*uid))
if err != nil {
log.Fatalf("Cannot read start position from db: %v", err)
}
if *debug {
vtClient = mysqlctl.NewDummyVtClient()
}
blp, err := mysqlctl.NewBinlogPlayer(vtClient, keyRange, uint32(*uid), brs, t, *txnBatch, time.Duration(*maxTxnInterval)*time.Second, *execDdl)
if err != nil {
log.Fatalf("error in initializing binlog player: %v", err)
}
err = blp.ApplyBinlogEvents(interrupted)
if err != nil {
log.Errorf("Error in applying binlog events, err %v", err)
}
log.Infof("vt_binlog_player done")
}
func (bpc *BinlogPlayerController) Iteration() (err error) {
defer func() {
if x := recover(); x != nil {
log.Errorf("BinlogPlayerController caught panic: %v", x)
err = fmt.Errorf("panic: %v", x)
}
}()
bpc.states.SetState(BINLOG_PLAYER_CONNECTING)
// create the db connection, connect it
vtClient := mysqlctl.NewDbClient(bpc.dbConfig)
if err := vtClient.Connect(); err != nil {
return fmt.Errorf("can't connect to database: %v", err)
}
defer vtClient.Close()
// Read the start position
startPosition, err := mysqlctl.ReadStartPosition(vtClient, string(bpc.source.KeyRange.Start.Hex()), string(bpc.source.KeyRange.End.Hex()))
if err != nil {
return fmt.Errorf("can't read startPosition: %v", err)
}
// TODO(alainjobart): Find the server list
// TODO(alainjobart): Pick a server (same if it's available,
// if not clear master file / pos and keep only group id)
// Create the player.
bpc.mu.Lock()
bpc.player, err = mysqlctl.NewBinlogPlayer(vtClient, startPosition, nil /*tables*/, 1 /*txnBatch*/, 30*time.Second /*maxTxnInterval*/, false /*execDdl*/)
bpc.mu.Unlock()
if err != nil {
return fmt.Errorf("can't create player: %v", err)
}
// Run player loop until it's done.
bpc.states.SetState(BINLOG_PLAYER_PLAYING)
err = bpc.player.ApplyBinlogEvents(bpc.interrupted)
bpc.mu.Lock()
bpc.player = nil
bpc.mu.Unlock()
return err
}
func (bpc *BinlogPlayerController) Iteration() (err error) {
defer func() {
if x := recover(); x != nil {
log.Errorf("%v: Caught panic: %v", bpc, x)
err = fmt.Errorf("panic: %v", x)
}
}()
// Enable any user to set the timestamp.
// We do it on every iteration to be sure, in case mysql was
// restarted.
bpc.DisableSuperToSetTimestamp()
// create the db connection, connect it
vtClient := mysqlctl.NewDbClient(bpc.dbConfig)
if err := vtClient.Connect(); err != nil {
return fmt.Errorf("can't connect to database: %v", err)
}
defer vtClient.Close()
// Read the start position
startPosition, err := mysqlctl.ReadStartPosition(vtClient, bpc.sourceShard.Uid)
if err != nil {
return fmt.Errorf("can't read startPosition: %v", err)
}
// Find the server list for the source shard in our cell
addrs, err := bpc.ts.GetEndPoints(bpc.cell, bpc.sourceShard.Keyspace, bpc.sourceShard.Shard, topo.TYPE_REPLICA)
if err != nil {
return fmt.Errorf("can't find any source tablet for %v %v %v: %v", bpc.cell, bpc.sourceShard.String(), topo.TYPE_REPLICA, err)
}
if len(addrs.Entries) == 0 {
return fmt.Errorf("empty source tablet list for %v %v %v", bpc.cell, bpc.sourceShard.String(), topo.TYPE_REPLICA)
}
// if the server we were using before is in the list, just keep using it
usePreviousServer := false
for _, addr := range addrs.Entries {
vtAddr := fmt.Sprintf("%v:%v", addr.Host, addr.NamedPortMap["_vtocc"])
if vtAddr == startPosition.Addr {
log.Infof("%v: Previous server %s still healthy, using it", bpc, vtAddr)
usePreviousServer = true
}
}
// if we can't use the previous server, pick a new one randomly
if !usePreviousServer {
newServerIndex := rand.Intn(len(addrs.Entries))
startPosition.Addr = fmt.Sprintf("%v:%v", addrs.Entries[newServerIndex].Host, addrs.Entries[newServerIndex].NamedPortMap["_vtocc"])
startPosition.Position.MasterFilename = ""
startPosition.Position.MasterPosition = 0
log.Infof("%v: Connecting to different server: %s", bpc, startPosition.Addr)
}
// the data we have to replicate is the intersection of the
// source keyrange and our keyrange
overlap, err := key.KeyRangesOverlap(bpc.sourceShard.KeyRange, bpc.keyRange)
if err != nil {
return fmt.Errorf("Source shard %v doesn't overlap destination shard %v", bpc.sourceShard.KeyRange, bpc.keyRange)
}
// Create the player.
player, err := mysqlctl.NewBinlogPlayer(vtClient, overlap, bpc.sourceShard.Uid, startPosition, nil /*tables*/, 1 /*txnBatch*/, 30*time.Second /*maxTxnInterval*/, false /*execDdl*/)
if err != nil {
return fmt.Errorf("can't create player: %v", err)
}
// Run player loop until it's done.
return player.ApplyBinlogEvents(bpc.interrupted)
}