tidb txn 源码
tidb txn 代码
文件路径：/sessiontxn/internal/txn.go
// Copyright 2022 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 internal
import (
"context"
"github.com/pingcap/kvproto/pkg/kvrpcpb"
"github.com/pingcap/tidb/kv"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/sessionctx/variable"
"github.com/pingcap/tidb/util/logutil"
"go.uber.org/zap"
)
// SetTxnAssertionLevel sets assertion level of a transactin. Note that assertion level should be set only once just
// after creating a new transaction.
func SetTxnAssertionLevel(txn kv.Transaction, assertionLevel variable.AssertionLevel) {
switch assertionLevel {
case variable.AssertionLevelOff:
txn.SetOption(kv.AssertionLevel, kvrpcpb.AssertionLevel_Off)
case variable.AssertionLevelFast:
txn.SetOption(kv.AssertionLevel, kvrpcpb.AssertionLevel_Fast)
case variable.AssertionLevelStrict:
txn.SetOption(kv.AssertionLevel, kvrpcpb.AssertionLevel_Strict)
}
}
// CommitBeforeEnterNewTxn is called before entering a new transaction. It checks whether the old
// txn is valid in which case we should commit it first.
func CommitBeforeEnterNewTxn(ctx context.Context, sctx sessionctx.Context) error {
txn, err := sctx.Txn(false)
if err != nil {
return err
}
if txn.Valid() {
txnStartTS := txn.StartTS()
txnScope := sctx.GetSessionVars().TxnCtx.TxnScope
err = sctx.CommitTxn(ctx)
if err != nil {
return err
}
logutil.Logger(ctx).Info("Try to create a new txn inside a transaction auto commit",
zap.Int64("schemaVersion", sctx.GetInfoSchema().SchemaMetaVersion()),
zap.Uint64("txnStartTS", txnStartTS),
zap.String("txnScope", txnScope))
}
return nil
}
// GetSnapshotWithTS returns a snapshot with ts.
func GetSnapshotWithTS(s sessionctx.Context, ts uint64, interceptor kv.SnapshotInterceptor) kv.Snapshot {
snap := s.GetStore().GetSnapshot(kv.Version{Ver: ts})
if interceptor != nil {
snap.SetOption(kv.SnapInterceptor, interceptor)
}
if s.GetSessionVars().InRestrictedSQL {
snap.SetOption(kv.RequestSourceInternal, true)
}
if tp := s.GetSessionVars().RequestSourceType; tp != "" {
snap.SetOption(kv.RequestSourceType, tp)
}
return snap
}
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