tidb binlog 源码
tidb binlog 代码
文件路径：/store/driver/txn/binlog.go
// Copyright 2021 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package txn
import (
"context"
"sync"
"github.com/pingcap/failpoint"
"github.com/pingcap/tidb/sessionctx/binloginfo"
"github.com/pingcap/tidb/util/logutil"
"github.com/pingcap/tipb/go-binlog"
"github.com/tikv/client-go/v2/tikv"
"go.uber.org/zap"
)
type binlogExecutor struct {
txn *tikv.KVTxn
binInfo *binloginfo.BinlogInfo
}
func (e *binlogExecutor) Skip() {
binloginfo.RemoveOneSkippedCommitter()
}
func (e *binlogExecutor) Prewrite(ctx context.Context, primary []byte) <-chan tikv.BinlogWriteResult {
ch := make(chan tikv.BinlogWriteResult, 1)
go func() {
logutil.Eventf(ctx, "start prewrite binlog")
bin := e.binInfo.Data
bin.StartTs = int64(e.txn.StartTS())
if bin.Tp == binlog.BinlogType_Prewrite {
bin.PrewriteKey = primary
}
wr := e.binInfo.WriteBinlog(e.txn.GetClusterID())
if wr.Skipped() {
e.binInfo.Data.PrewriteValue = nil
binloginfo.AddOneSkippedCommitter()
}
logutil.Eventf(ctx, "finish prewrite binlog")
ch <- wr
}()
return ch
}
func (e *binlogExecutor) Commit(ctx context.Context, commitTS int64) {
e.binInfo.Data.Tp = binlog.BinlogType_Commit
if commitTS == 0 {
e.binInfo.Data.Tp = binlog.BinlogType_Rollback
}
e.binInfo.Data.CommitTs = commitTS
e.binInfo.Data.PrewriteValue = nil
wg := sync.WaitGroup{}
mock := false
failpoint.Inject("mockSyncBinlogCommit", func(val failpoint.Value) {
if val.(bool) {
wg.Add(1)
mock = true
}
})
go func() {
logutil.Eventf(ctx, "start write finish binlog")
binlogWriteResult := e.binInfo.WriteBinlog(e.txn.GetClusterID())
err := binlogWriteResult.GetError()
if err != nil {
logutil.BgLogger().Error("failed to write binlog",
zap.Error(err))
}
logutil.Eventf(ctx, "finish write finish binlog")
if mock {
wg.Done()
}
}()
if mock {
wg.Wait()
}
}
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