137 lines
3.8 KiB
Go
137 lines
3.8 KiB
Go
// Copyright 2021 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package session
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import (
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"context"
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"github.com/pingcap/errors"
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"github.com/pingcap/tidb/executor"
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"github.com/pingcap/tidb/infoschema"
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"github.com/pingcap/tidb/parser/ast"
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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/sessiontxn"
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"github.com/pingcap/tidb/sessiontxn/legacy"
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"github.com/pingcap/tidb/sessiontxn/staleread"
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)
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func init() {
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sessiontxn.GetTxnManager = getTxnManager
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}
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func getTxnManager(sctx sessionctx.Context) sessiontxn.TxnManager {
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if manager, ok := sctx.GetSessionVars().TxnManager.(sessiontxn.TxnManager); ok {
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return manager
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}
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manager := newTxnManager(sctx)
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sctx.GetSessionVars().TxnManager = manager
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return manager
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}
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// txnManager implements sessiontxn.TxnManager
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type txnManager struct {
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sctx sessionctx.Context
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ctxProvider sessiontxn.TxnContextProvider
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}
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func newTxnManager(sctx sessionctx.Context) *txnManager {
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return &txnManager{sctx: sctx}
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}
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func (m *txnManager) GetTxnInfoSchema() infoschema.InfoSchema {
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if m.ctxProvider == nil {
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return nil
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}
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return m.ctxProvider.GetTxnInfoSchema()
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}
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func (m *txnManager) GetStmtReadTS() (uint64, error) {
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if m.ctxProvider == nil {
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return 0, errors.New("context provider not set")
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}
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return m.ctxProvider.GetStmtReadTS()
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}
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func (m *txnManager) GetStmtForUpdateTS() (uint64, error) {
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if m.ctxProvider == nil {
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return 0, errors.New("context provider not set")
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}
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return m.ctxProvider.GetStmtForUpdateTS()
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}
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func (m *txnManager) GetContextProvider() sessiontxn.TxnContextProvider {
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return m.ctxProvider
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}
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func (m *txnManager) EnterNewTxn(ctx context.Context, r *sessiontxn.EnterNewTxnRequest) error {
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m.ctxProvider = m.newProviderWithRequest(r)
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if err := m.ctxProvider.OnInitialize(ctx, r.Type); err != nil {
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return err
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}
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if r.Type == sessiontxn.EnterNewTxnWithBeginStmt {
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m.sctx.GetSessionVars().SetInTxn(true)
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}
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return nil
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}
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// OnStmtStart is the hook that should be called when a new statement started
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func (m *txnManager) OnStmtStart(ctx context.Context) error {
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if m.ctxProvider == nil {
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return errors.New("context provider not set")
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}
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return m.ctxProvider.OnStmtStart(ctx)
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}
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// OnStmtErrorForNextAction is the hook that should be called when a new statement get an error
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func (m *txnManager) OnStmtErrorForNextAction(point sessiontxn.StmtErrorHandlePoint, err error) (sessiontxn.StmtErrorAction, error) {
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if m.ctxProvider == nil {
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return sessiontxn.NoIdea()
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}
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return m.ctxProvider.OnStmtErrorForNextAction(point, err)
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}
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// OnStmtRetry is the hook that should be called when a statement retry
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func (m *txnManager) OnStmtRetry(ctx context.Context) error {
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if m.ctxProvider == nil {
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return errors.New("context provider not set")
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}
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return m.ctxProvider.OnStmtRetry(ctx)
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}
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func (m *txnManager) newProviderWithRequest(r *sessiontxn.EnterNewTxnRequest) sessiontxn.TxnContextProvider {
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if r.Provider != nil {
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return r.Provider
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}
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txnMode := r.TxnMode
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if txnMode == "" {
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txnMode = m.sctx.GetSessionVars().TxnMode
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}
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if r.StaleReadTS > 0 {
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return staleread.NewStalenessTxnContextProvider(m.sctx, r.StaleReadTS, nil)
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}
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return &legacy.SimpleTxnContextProvider{
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Sctx: m.sctx,
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Pessimistic: txnMode == ast.Pessimistic,
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CausalConsistencyOnly: r.CausalConsistencyOnly,
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UpdateForUpdateTS: executor.UpdateForUpdateTS,
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}
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}
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