//This sends the error to the client.
func sendError(sendReply mysqlctl.SendUpdateStreamResponse, reqIdentifier string, inputErr error, blpPos *mysqlctl.BlPosition) {
var err error
streamBuf := new(mysqlctl.BinlogResponse)
streamBuf.Error = inputErr.Error()
if blpPos != nil {
streamBuf.BlPosition = *blpPos
}
buf := []*mysqlctl.BinlogResponse{streamBuf}
err = sendStream(sendReply, buf)
if err != nil {
relog.Error("Error in communicating message %v with the client: %v", inputErr, err)
}
}
//This builds BinlogResponse for each transaction.
func (blp *Blp) buildTxnResponse() (txnResponseList []*mysqlctl.BinlogResponse, dmlCount int64) {
var line []byte
var keyspaceIdStr string
var keyspaceId key.KeyspaceId
dmlBuffer := make([]string, 0, 10)
for _, event := range blp.txnLineBuffer {
line = event.LogLine
if bytes.HasPrefix(line, mysqlctl.BINLOG_BEGIN) {
streamBuf := new(mysqlctl.BinlogResponse)
streamBuf.BlPosition = event.BlPosition
streamBuf.SqlType = mysqlctl.BEGIN
txnResponseList = append(txnResponseList, streamBuf)
continue
}
if bytes.HasPrefix(line, mysqlctl.BINLOG_COMMIT) {
commitEvent := createCommitEvent(event)
txnResponseList = append(txnResponseList, commitEvent)
continue
}
sqlType := mysqlctl.GetSqlType(event.firstKw)
if sqlType == mysqlctl.DML {
keyspaceIdStr, keyspaceId = parseKeyspaceId(line, mysqlctl.GetDmlType(event.firstKw))
if keyspaceIdStr == "" {
continue
}
if !blp.keyspaceRange.Contains(keyspaceId) {
dmlBuffer = dmlBuffer[:0]
continue
}
dmlCount += 1
//extract keyspace id - match it with client's request,
//extract index ids.
dmlBuffer = append(dmlBuffer, string(line))
dmlEvent := blp.createDmlEvent(event, keyspaceIdStr)
dmlEvent.Sql = make([]string, len(dmlBuffer))
dmlLines := copy(dmlEvent.Sql, dmlBuffer)
if dmlLines < len(dmlBuffer) {
relog.Warning("The entire dml buffer was not properly copied")
}
txnResponseList = append(txnResponseList, dmlEvent)
dmlBuffer = dmlBuffer[:0]
} else {
//add as prefixes to the DML from last DML.
//start a new dml buffer and keep adding to it.
dmlBuffer = append(dmlBuffer, string(line))
}
}
return txnResponseList, dmlCount
}