// Stream implements BinlogStreamer.Stream().
func (bls *binlogConnStreamer) Stream(ctx *sync2.ServiceContext) (err error) {
var stopPos myproto.ReplicationPosition
defer func() {
if err != nil {
binlogStreamerErrors.Add("Stream", 1)
err = fmt.Errorf("stream error @ %v, error: %v", stopPos, err)
log.Error(err.Error())
}
log.Infof("Stream ended @ %v", stopPos)
}()
if bls.conn, err = mysqlctl.NewSlaveConnection(bls.mysqld); err != nil {
return
}
defer bls.conn.Close()
var events <-chan proto.BinlogEvent
events, err = bls.conn.StartBinlogDump(bls.startPos)
if err != nil {
return
}
// parseEvents will loop until the events channel is closed, the
// service enters the SHUTTING_DOWN state, or an error occurs.
stopPos, err = bls.parseEvents(ctx, events)
return
}
// Stream starts streaming binlog events using the settings from NewBinlogStreamer().
func (bls *BinlogStreamer) Stream(ctx *sync2.ServiceContext) (err error) {
stopPos := bls.startPos
defer func() {
if err != nil {
err = fmt.Errorf("stream error @ %v: %v", stopPos, err)
}
log.Infof("stream ended @ %v, err = %v", stopPos, err)
}()
if bls.conn, err = mysqlctl.NewSlaveConnection(bls.mysqld); err != nil {
return err
}
defer bls.conn.Close()
// Check that the default charsets match, if the client specified one.
// Note that BinlogStreamer uses the settings for the 'dba' user, while
// BinlogPlayer uses the 'filtered' user, so those are the ones whose charset
// must match. Filtered replication should still succeed even with a default
// mismatch, since we pass per-statement charset info. However, Vitess in
// general doesn't support servers with different default charsets, so we
// treat it as a configuration error.
if bls.clientCharset != nil {
cs, err := bls.conn.GetCharset()
if err != nil {
return fmt.Errorf("can't get charset to check binlog stream: %v", err)
}
log.Infof("binlog stream client charset = %v, server charset = %v", *bls.clientCharset, cs)
if cs != *bls.clientCharset {
return fmt.Errorf("binlog stream client charset (%v) doesn't match server (%v)", *bls.clientCharset, cs)
}
}
var events <-chan proto.BinlogEvent
events, err = bls.conn.StartBinlogDump(bls.startPos)
if err != nil {
return err
}
// parseEvents will loop until the events channel is closed, the
// service enters the SHUTTING_DOWN state, or an error occurs.
stopPos, err = bls.parseEvents(ctx, events)
return err
}