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tcc_fence_wrapper_handler.go
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tcc_fence_wrapper_handler.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 handler
import (
"container/list"
"context"
"database/sql"
"errors"
"fmt"
"sync"
"time"
"github.com/go-sql-driver/mysql"
"github.com/seata/seata-go/pkg/rm/tcc/fence/enum"
"github.com/seata/seata-go/pkg/rm/tcc/fence/store/db/dao"
"github.com/seata/seata-go/pkg/rm/tcc/fence/store/db/model"
"github.com/seata/seata-go/pkg/tm"
"github.com/seata/seata-go/pkg/util/log"
)
type tccFenceWrapperHandler struct {
tccFenceDao dao.TCCFenceStore
logQueue chan *FenceLogIdentity
logCache list.List
logQueueOnce sync.Once
logQueueCloseOnce sync.Once
}
type FenceLogIdentity struct {
xid string
branchId int64
}
const (
maxQueueSize = 500
)
var (
fenceHandler *tccFenceWrapperHandler
fenceOnce sync.Once
)
func GetFenceHandler() *tccFenceWrapperHandler {
if fenceHandler == nil {
fenceOnce.Do(func() {
fenceHandler = &tccFenceWrapperHandler{
tccFenceDao: dao.GetTccFenceStoreDatabaseMapper(),
}
})
}
return fenceHandler
}
func (handler *tccFenceWrapperHandler) PrepareFence(ctx context.Context, tx *sql.Tx) error {
xid := tm.GetBusinessActionContext(ctx).Xid
branchId := tm.GetBusinessActionContext(ctx).BranchId
actionName := tm.GetBusinessActionContext(ctx).ActionName
err := handler.insertTCCFenceLog(tx, xid, branchId, actionName, enum.StatusTried)
if err != nil {
if mysqlError, ok := errors.Unwrap(err).(*mysql.MySQLError); ok && mysqlError.Number == 1062 {
// todo add clean command to channel.
handler.pushCleanChannel(xid, branchId)
}
return fmt.Errorf("insert tcc fence record errors, prepare fence failed. xid= %s, branchId= %d, [%w]", xid, branchId, err)
}
return nil
}
func (handler *tccFenceWrapperHandler) CommitFence(ctx context.Context, tx *sql.Tx) error {
xid := tm.GetBusinessActionContext(ctx).Xid
branchId := tm.GetBusinessActionContext(ctx).BranchId
fenceDo, err := handler.tccFenceDao.QueryTCCFenceDO(tx, xid, branchId)
if err != nil {
return fmt.Errorf(" commit fence method failed. xid= %s, branchId= %d, [%w]", xid, branchId, err)
}
if fenceDo == nil {
return fmt.Errorf("tcc fence record not exists, commit fence method failed. xid= %s, branchId= %d", xid, branchId)
}
if fenceDo.Status == enum.StatusCommitted {
log.Infof("branch transaction has already committed before. idempotency rejected. xid: %s, branchId: %d, status: %d", xid, branchId, fenceDo.Status)
return nil
}
if fenceDo.Status == enum.StatusRollbacked || fenceDo.Status == enum.StatusSuspended {
// enable warn level
log.Warnf("branch transaction status is unexpected. xid: %s, branchId: %d, status: %s", xid, branchId, fenceDo.Status)
return fmt.Errorf("branch transaction status is unexpected. xid: %s, branchId: %d, status: %d", xid, branchId, fenceDo.Status)
}
return handler.updateFenceStatus(tx, xid, branchId, enum.StatusCommitted)
}
func (handler *tccFenceWrapperHandler) RollbackFence(ctx context.Context, tx *sql.Tx) error {
xid := tm.GetBusinessActionContext(ctx).Xid
branchId := tm.GetBusinessActionContext(ctx).BranchId
actionName := tm.GetBusinessActionContext(ctx).ActionName
fenceDo, err := handler.tccFenceDao.QueryTCCFenceDO(tx, xid, branchId)
if err != nil {
return fmt.Errorf("rollback fence method failed. xid= %s, branchId= %d, [%w]", xid, branchId, err)
}
// record is null, mean the need suspend
if fenceDo == nil {
err = handler.insertTCCFenceLog(tx, xid, branchId, actionName, enum.StatusSuspended)
if err != nil {
return fmt.Errorf("insert tcc fence record errors, rollback fence failed. xid= %s, branchId= %d, [%w]", xid, branchId, err)
}
log.Infof("Insert tcc fence suspend record xid: %s, branchId: %d", xid, branchId)
return nil
}
// have rollbacked or suspended
if fenceDo.Status == enum.StatusRollbacked || fenceDo.Status == enum.StatusSuspended {
// enable warn level
log.Infof("Branch transaction had already rollbacked before, idempotency rejected. xid: %s, branchId: %d, status: %s", xid, branchId, fenceDo.Status)
return nil
}
if fenceDo.Status == enum.StatusCommitted {
log.Warnf("Branch transaction status is unexpected. xid: %s, branchId: %d, status: %d", xid, branchId, fenceDo.Status)
return fmt.Errorf("branch transaction status is unexpected. xid: %s, branchId: %d, status: %d", xid, branchId, fenceDo.Status)
}
return handler.updateFenceStatus(tx, xid, branchId, enum.StatusRollbacked)
}
func (handler *tccFenceWrapperHandler) insertTCCFenceLog(tx *sql.Tx, xid string, branchId int64, actionName string, status enum.FenceStatus) error {
tccFenceDo := model.TCCFenceDO{
Xid: xid,
BranchId: branchId,
ActionName: actionName,
Status: status,
}
return handler.tccFenceDao.InsertTCCFenceDO(tx, &tccFenceDo)
}
func (handler *tccFenceWrapperHandler) updateFenceStatus(tx *sql.Tx, xid string, branchId int64, status enum.FenceStatus) error {
return handler.tccFenceDao.UpdateTCCFenceDO(tx, xid, branchId, enum.StatusTried, status)
}
func (handler *tccFenceWrapperHandler) InitLogCleanChannel() {
handler.logQueueOnce.Do(func() {
go handler.traversalCleanChannel()
})
}
func (handler *tccFenceWrapperHandler) DestroyLogCleanChannel() {
handler.logQueueCloseOnce.Do(func() {
close(handler.logQueue)
})
}
func (handler *tccFenceWrapperHandler) deleteFence(xid string, id int64) error {
// todo implement
return nil
}
func (handler *tccFenceWrapperHandler) deleteFenceByDate(datetime time.Time) int32 {
// todo implement
return 0
}
func (handler *tccFenceWrapperHandler) pushCleanChannel(xid string, branchId int64) {
// todo implement
fli := &FenceLogIdentity{
xid: xid,
branchId: branchId,
}
select {
case handler.logQueue <- fli:
// todo add batch delete from log cache.
default:
handler.logCache.PushBack(fli)
}
log.Infof("add one log to clean queue: %v ", fli)
}
func (handler *tccFenceWrapperHandler) traversalCleanChannel() {
handler.logQueue = make(chan *FenceLogIdentity, maxQueueSize)
for li := range handler.logQueue {
if err := handler.deleteFence(li.xid, li.branchId); err != nil {
log.Errorf("delete fence log failed, xid: %s, branchId: &s", li.xid, li.branchId)
}
}
}