/
transaction.go
108 lines (88 loc) · 2.95 KB
/
transaction.go
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/*
* Tencent is pleased to support the open source community by making 蓝鲸 available.
* Copyright (C) 2017-2018 THL A29 Limited, a Tencent company. All rights reserved.
* Licensed under the MIT License (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
* http://opensource.org/licenses/MIT
* 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 Transaction
import (
"context"
"encoding/base64"
"fmt"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/x/mongo/driver/uuid"
)
var (
client *mongo.Client
)
// CommitTransaction 提交事务
func CommitTransaction(ctx context.Context, txnUUID string) error {
reloadSession, _, err := reloadSession(ctx, client, txnUUID)
if err != nil {
return err
}
// we commit the transaction with the session id
err = reloadSession.CommitTransaction(ctx)
if err != nil {
return fmt.Errorf("commit transaction: %s failed, err: %v", txnUUID, err)
}
return nil
}
// AbortTransaction 取消事务
func AbortTransaction(ctx context.Context, txnUUID string) error {
reloadSession, _, err := reloadSession(ctx, client, txnUUID)
if err != nil {
return err
}
// we abort the transaction with the session id
err = reloadSession.AbortTransaction(ctx)
if err != nil {
return fmt.Errorf("abort transaction: %s failed, err: %v", txnUUID, err)
}
return nil
}
func StartTransaction(ctx context.Context, cli *mongo.Client) (mongo.Session, string, error) {
return reloadSession(ctx, cli, "")
}
func ReloadSession(ctx context.Context, cli *mongo.Client, txnUUID string) (mongo.Session, error) {
sess, _, err := reloadSession(ctx, cli, txnUUID)
return sess, err
}
func reloadSession(ctx context.Context, cli *mongo.Client, txnUUID string) (mongo.Session, string, error) {
// create a session client.
sess, err := cli.StartSession()
if err != nil {
return nil, txnUUID, fmt.Errorf("start session failed, err: %v", err)
}
// only for changing the transaction status
err = sess.StartTransaction()
if err != nil {
return nil, txnUUID, fmt.Errorf("start transaction %s failed: %v", txnUUID, err)
}
var txnNumber int64
if txnUUID == "" {
mUUID, err := uuid.New()
if err != nil {
return nil, txnUUID, fmt.Errorf("generate txn number failed, err: %v", err)
}
txnUUID = base64.StdEncoding.EncodeToString(mUUID[:])
txnNumber = 1
} else {
txnNumber = 2
}
// reset the session info with the session id.
info := &mongo.TxnSession{
TxnNubmer: txnNumber,
SessionID: txnUUID,
}
err = mongo.TnxReloadSession(sess, info)
if err != nil {
return nil, txnUUID, fmt.Errorf("reload transaction: %s failed, err: %v", txnUUID, err)
}
return sess, txnUUID, nil
}