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multi_executor.go
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multi_executor.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 at
import (
"context"
"fmt"
"github.com/seata/seata-go/pkg/datasource/sql/exec"
"github.com/seata/seata-go/pkg/datasource/sql/types"
"github.com/seata/seata-go/pkg/util/log"
)
type multiExecutor struct {
baseExecutor
parserCtx *types.ParseContext
execContext *types.ExecContext
}
// NewMultiExecutor get new multi executor
func NewMultiExecutor(parserCtx *types.ParseContext, execContext *types.ExecContext, hooks []exec.SQLHook) executor {
return &multiExecutor{parserCtx: parserCtx, execContext: execContext, baseExecutor: baseExecutor{hooks: hooks}}
}
// ExecContext exec SQL, and generate before image and after image
func (m *multiExecutor) ExecContext(ctx context.Context, f exec.CallbackWithNamedValue) (types.ExecResult, error) {
m.beforeHooks(ctx, m.execContext)
defer func() {
m.afterHooks(ctx, m.execContext)
}()
beforeImages, err := m.beforeImage(ctx, m.parserCtx)
if err != nil {
return nil, err
}
res, err := f(ctx, m.execContext.Query, m.execContext.NamedValues)
if err != nil {
return nil, err
}
afterImages, err := m.afterImage(ctx, m.parserCtx, beforeImages)
if err != nil {
return nil, err
}
for _, beforeImage := range beforeImages {
m.execContext.TxCtx.RoundImages.AppendBeofreImage(beforeImage)
}
for _, afterImage := range afterImages {
m.execContext.TxCtx.RoundImages.AppendAfterImage(afterImage)
}
return res, nil
}
func (m *multiExecutor) beforeImage(ctx context.Context, parseContext *types.ParseContext) ([]*types.RecordImage, error) {
if len(parseContext.MultiStmt) == 0 {
return nil, nil
}
tableParsers, err := m.groupParsersByTableName(parseContext)
if err != nil {
log.Infof("group parsers by table name failed, %s", err)
return nil, err
}
var beforeImages = make([]*types.RecordImage, 0)
for _, multiParser := range tableParsers {
var images []*types.RecordImage
switch multiParser.ExecutorType {
case types.UpdateExecutor:
multiUpdateExec := NewMultiUpdateExecutor(multiParser, m.execContext, m.hooks)
images, err = multiUpdateExec.beforeImage(ctx)
case types.DeleteExecutor:
multiDeleteExec := NewMultiDeleteExecutor(multiParser, m.execContext, m.hooks)
images, err = multiDeleteExec.beforeImage(ctx)
default:
return nil, fmt.Errorf("not support multi sql %s", m.execContext.Query)
}
if err != nil {
return nil, err
}
beforeImages = append(beforeImages, images...)
}
return beforeImages, err
}
func (m *multiExecutor) afterImage(ctx context.Context, parseContext *types.ParseContext, beforeImages []*types.RecordImage) ([]*types.RecordImage, error) {
if len(parseContext.MultiStmt) == 0 {
return nil, nil
}
tableParsers, err := m.groupParsersByTableName(parseContext)
if err != nil {
log.Infof("group parsers by table name failed, %s", err)
return nil, err
}
var afterImages = make([]*types.RecordImage, 0)
for _, multiParser := range tableParsers {
var images []*types.RecordImage
switch multiParser.ExecutorType {
case types.UpdateExecutor:
multiUpdateExec := NewMultiUpdateExecutor(multiParser, m.execContext, m.hooks)
images, err = multiUpdateExec.afterImage(ctx, beforeImages)
case types.DeleteExecutor:
multiDeleteExec := NewMultiDeleteExecutor(multiParser, m.execContext, m.hooks)
images, err = multiDeleteExec.afterImage(ctx)
default:
return nil, fmt.Errorf("not support multi sql %s", m.execContext.Query)
}
if err != nil {
return nil, err
}
afterImages = append(afterImages, images...)
}
return afterImages, err
}
func (m *multiExecutor) groupParsersByTableName(parseContext *types.ParseContext) (map[string]*types.ParseContext, error) {
var (
err error
tableName string
tableParsers = make(map[string]*types.ParseContext, len(parseContext.MultiStmt))
)
for _, parser := range parseContext.MultiStmt {
tempParser := *parser
tableName, err = parser.GetTableName()
if err != nil {
return nil, err
}
if stmtList, ok := tableParsers[tableName]; ok {
sts := append(stmtList.MultiStmt, &tempParser)
tableParsers[tableName].MultiStmt = sts
} else {
tableParsers[tableName] = &types.ParseContext{
SQLType: parser.SQLType,
ExecutorType: parser.ExecutorType,
MultiStmt: []*types.ParseContext{&tempParser},
}
}
}
return tableParsers, err
}