Golang基于DTM的分布式事务TCC实战

Golang基于DTM的分布式事务SAGA实战-CSDN博客

源代码：https://github.com/Ssummer520/dtm-gin

代码在宿主机运行 docker network:bridge

docker安装,安装成功后可以访问http://localhost:36789/ 打开dtm事务web-ui

复制代码

docker run -itd  --name dtm -p 36789:36789 -p 36790:36790  yedf/dtm:latest

部署mysql

基于docker部署

复制代码

  docker run -d \
  --name mysql-latest \
  -e MYSQL_ROOT_PASSWORD=sa123456 \
  -e MYSQL_USER=sa \
  -e MYSQL_PASSWORD=sa123456 \
  -e MYSQL_DATABASE=test\
  -p 3306:3306 \
  -v db_data:/var/lib/mysql \
  mysql:latest

dtm子事务屏障

异常与子事务屏障 | DTM开源项目文档

准备 RM 数据表

子事务依赖屏障表

子事务屏障技术依赖本地数据库中创建子事务屏障相关的表（barrier），在源代码的示例中默认的数据库和表分别为（部署依赖的数据库）

库：dtm_barrier

表：barrier（子事务屏障依赖表）

我们创建上面的库表，如果需要自定义库表名称

sql 复制代码

create database if not exists dtm_barrier
/*!40100 DEFAULT CHARACTER SET utf8mb4 */
;
drop table if exists dtm_barrier.barrier;
create table if not exists dtm_barrier.barrier(
  id bigint(22) PRIMARY KEY AUTO_INCREMENT,
  trans_type varchar(45) default '',
  gid varchar(128) default '',
  branch_id varchar(128) default '',
  op varchar(45) default '',
  barrier_id varchar(45) default '',
  reason varchar(45) default '' comment 'the branch type who insert this record',
  create_time datetime DEFAULT now(),
  update_time datetime DEFAULT now(),
  key(create_time),
  key(update_time),
  UNIQUE key(gid, branch_id, op, barrier_id)
) ENGINE = InnoDB DEFAULT CHARSET = utf8mb4;

转账微服务依赖库表

库：busi

表：user_account

sql 复制代码

CREATE DATABASE if not exists dtm_busi
/*!40100 DEFAULT CHARACTER SET utf8mb4 */
;
drop table if exists dtm_busi.user_account;
create table if not exists dtm_busi.user_account(
  id int(11) PRIMARY KEY AUTO_INCREMENT,
  user_id int(11) UNIQUE,
  balance DECIMAL(10, 2) not null default '0',
  trading_balance DECIMAL(10, 2) not null default '0',
  create_time datetime DEFAULT now(),
  update_time datetime DEFAULT now(),
  key(create_time),
  key(update_time)
) ENGINE = InnoDB DEFAULT CHARSET = utf8mb4;
insert into dtm_busi.user_account (user_id, balance)
values (1, 10000),
  (2, 10000) on DUPLICATE KEY
UPDATE balance =
values (balance);

ddl和数据

sql 复制代码

/*
 Navicat Premium Dump SQL

 Source Server         : localhost_3306
 Source Server Type    : MySQL
 Source Server Version : 80039 (8.0.39)
 Source Host           : localhost:3306
 Source Schema         : test

 Target Server Type    : MySQL
 Target Server Version : 80039 (8.0.39)
 File Encoding         : 65001

 Date: 17/08/2024 10:44:02
*/

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for user_account
-- ----------------------------
DROP TABLE IF EXISTS `user_account`;
CREATE TABLE `user_account` (
  `id` int NOT NULL AUTO_INCREMENT,
  `user_id` int NOT NULL,
  `balance` decimal(10,2) NOT NULL DEFAULT '0.00',
  `trading_balance` decimal(10,2) NOT NULL DEFAULT '0.00',
  `create_time` datetime DEFAULT CURRENT_TIMESTAMP,
  `update_time` datetime DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`),
  UNIQUE KEY `user_id` (`user_id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

-- ----------------------------
-- Records of user_account
-- ----------------------------
BEGIN;
INSERT INTO `user_account` (`id`, `user_id`, `balance`, `trading_balance`, `create_time`, `update_time`) VALUES (1, 1000, 11051.00, 0.00, '2024-08-16 09:19:44', '2024-08-16 13:52:11');
INSERT INTO `user_account` (`id`, `user_id`, `balance`, `trading_balance`, `create_time`, `update_time`) VALUES (2, 1001, 11051.00, 0.00, '2024-08-16 09:20:13', '2024-08-16 13:52:11');
COMMIT;

SET FOREIGN_KEY_CHECKS = 1;

允许空回滚

如图我们模拟丢包的问题，让try阶段没有进行依赖于 gin框架引入timeout中间件进行控制

复制代码

func timeoutMiddleware(duration time.Duration) gin.HandlerFunc {
	return func(c *gin.Context) {
		ctx, cancel := context.WithTimeout(c.Request.Context(), duration)
		defer cancel()

		c.Request = c.Request.WithContext(ctx)

		done := make(chan struct{})
		go func() {
			c.Next()
			close(done)
		}()

		select {
		case <-ctx.Done():
			c.JSON(http.StatusGatewayTimeout, gin.H{"error": "request timed out"})
			c.Abort()
		case <-done:
		}
	}
}