github.com/pingcap/tiflow@v0.0.0-20240520035814-5bf52d54e205/dm/pkg/binlog/event/ddl.go (about)

     1  // Copyright 2019 PingCAP, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package event
    15  
    16  import (
    17  	"bytes"
    18  	"time"
    19  
    20  	"github.com/go-mysql-org/go-mysql/mysql"
    21  	"github.com/go-mysql-org/go-mysql/replication"
    22  	"github.com/pingcap/tiflow/dm/pkg/terror"
    23  )
    24  
    25  // GenDDLEvents generates binlog events for DDL statements.
    26  // events: [GTIDEvent, QueryEvent]
    27  func GenDDLEvents(flavor string, serverID, latestPos uint32, latestGTID mysql.GTIDSet, schema, query string, genGTID, anonymousGTID bool, ts int64) (*DDLDMLResult, error) {
    28  	if ts == 0 {
    29  		ts = time.Now().Unix()
    30  	}
    31  	// GTIDEvent, increase GTID first
    32  	latestGTID, err := GTIDIncrease(flavor, latestGTID)
    33  	if err != nil {
    34  		return nil, terror.Annotatef(err, "increase GTID %s", latestGTID)
    35  	}
    36  	var gtidEv *replication.BinlogEvent
    37  	if genGTID {
    38  		gtidEv, err = GenCommonGTIDEvent(flavor, serverID, latestPos, latestGTID, anonymousGTID, ts)
    39  		if err != nil {
    40  			return nil, terror.Annotate(err, "generate GTIDEvent")
    41  		}
    42  		latestPos = gtidEv.Header.LogPos
    43  	}
    44  
    45  	// QueryEvent
    46  	header := &replication.EventHeader{
    47  		Timestamp: uint32(ts),
    48  		ServerID:  serverID,
    49  		Flags:     defaultHeaderFlags,
    50  	}
    51  	queryEv, err := GenQueryEvent(header, latestPos, defaultSlaveProxyID, defaultExecutionTime, defaultErrorCode, defaultStatusVars, []byte(schema), []byte(query))
    52  	if err != nil {
    53  		return nil, terror.Annotatef(err, "generate QueryEvent for schema %s, query %s", schema, query)
    54  	}
    55  	latestPos = queryEv.Header.LogPos
    56  
    57  	var buf bytes.Buffer
    58  	var events []*replication.BinlogEvent
    59  	if genGTID {
    60  		_, err = buf.Write(gtidEv.RawData)
    61  		if err != nil {
    62  			return nil, terror.ErrBinlogWriteDataToBuffer.AnnotateDelegate(err, "write GTIDEvent data % X", gtidEv.RawData)
    63  		}
    64  		events = append(events, gtidEv)
    65  	}
    66  	_, err = buf.Write(queryEv.RawData)
    67  	if err != nil {
    68  		return nil, terror.ErrBinlogWriteDataToBuffer.AnnotateDelegate(err, "write QueryEvent data % X", queryEv.RawData)
    69  	}
    70  	events = append(events, queryEv)
    71  
    72  	return &DDLDMLResult{
    73  		Events:     events,
    74  		Data:       buf.Bytes(),
    75  		LatestPos:  latestPos,
    76  		LatestGTID: latestGTID,
    77  	}, nil
    78  }