Spring Cloud 整合最新版seata分布式事务(六)

服务之间异常怎么办？事务怎么解决呢？

前言

现在我有 订单系统, 支付系统.注册中心 每个系统都是单独的,事务也都是本地事务,也是独立的.那么问题来了. 我--->订单系统-->支付系统.-->订单系统--->我 支付系统成功了 ,自己的事务也提交了. 到订单系统结果失败了.(结果就是钱付了,订单还未支付.)这样就存在了问题呀. 更多的问题也存在库存系统,加库存,改订单状态,支付等等,每个单独的模块事务怎么保持统一呢!!

seata 介绍

Seata 是一款开源的分布式事务解决方案，致力于提供高性能和简单易用的分布式事务服务。Seata 将为用户提供了 AT、TCC、SAGA 和 XA 事务模式，为用户打造一站式的分布式解决方案.

seata各种官方例子连接:https://github.com/seata/seata-samples seata服务端下载链接:https://github.com/seata/seata/releases

根据例子,我搞了好久好久好久好久好久才把例子跑起来.我也是服了,中间各种问题,网上的答案都尼玛一模一样!,人家都能成功,我就失败.郁闷死了.

思路

1.下载官方的服务端seata-server 2.下载官方客户端例子(我选的是springcloud-eureka-feign-mybatis-seata) 3.修改配置. 4.启动. 5.哪里错改哪里! 前4步也就半个小时,顶多俩小时,ok了. 第5步鬼知道多长时间.

我结合官方demo,整合到自己的项目中去.以及中间遇到的问题记录

seata服务端

下载seata服务端

seata服务端下载链接:https://github.com/seata/seata/releases 我选的是最新的v1.1.0版本,下载到本地即可

修改seata配置

我这里就说win下怎么启动: 首先修改目录下的conf中的配置 file.conf 其中我没有使用db方式, 使用的默认file方式,应该不需要修改

## transaction log store, only used in seata-server
store {
  ## store mode: file、db
  mode = "file"

  ## file store property
  file {
    ## store location dir
    dir = "sessionStore"
    # branch session size , if exceeded first try compress lockkey, still exceeded throws exceptions
    maxBranchSessionSize = 16384
    # globe session size , if exceeded throws exceptions
    maxGlobalSessionSize = 512
    # file buffer size , if exceeded allocate new buffer
    fileWriteBufferCacheSize = 16384
    # when recover batch read size
    sessionReloadReadSize = 100
    # async, sync
    flushDiskMode = async
  }

  ## database store property
  db {
    ## the implement of javax.sql.DataSource, such as DruidDataSource(druid)/BasicDataSource(dbcp) etc.
    datasource = "dbcp"
    ## mysql/oracle/h2/oceanbase etc.
    dbType = "mysql"
    driverClassName = "com.mysql.jdbc.Driver"
    url = "jdbc:mysql://127.0.0.1:3306/seata"
    user = "mysql"
    password = "mysql"
    minConn = 1
    maxConn = 10
    globalTable = "global_table"
    branchTable = "branch_table"
    lockTable = "lock_table"
    queryLimit = 100
  }
}

registry.conf 我使用的类型是eureka,配置上之前的注册中心地址

registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  type = "eureka"
  eureka {
    serviceUrl = "http://server01:8761/eureka/"
    application = "default"
    weight = "1"
  }
}

config {
  # file、nacos 、apollo、zk、consul、etcd3
  type = "file"
  file {
    name = "file.conf"
  }
}

启动seata服务端

修改完毕,首先启动你的注册中心eureka,然后启动这个seata服务端 首先进入bin目录 seata-server.bat 这个是win命令, 在这个目录进入cmd, 将这个文件拖进窗口,输入

 -h 127.0.0.1 -p 8091 -m file

最终效果: 脚本参数: -p:指定启动seata server的端口号。 -h:指定seata server所绑定的主机 -m:指定事务日志、事务执行信息存储的方式，目前支持file（文件方式）、db（数据库方式)

这个地方我遇到的问题: 第一个:我没有指定主机,然后和后面的配置里面对应不上,显示连接不上seata server服务.

导入jar

        <!--seata-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-seata</artifactId>
            <version>2.1.0.RELEASE</version>
        </dependency>

修改自己项目的配置

新增两个配置文件,每个模块里面都需要,先修改一个,然后拷贝过去就行了

file.conf 文件

其中大部分是默认的,只需要修改一个地方

service {
  #transaction service group mapping
  vgroup_mapping.tx = "default"
  #only support when registry.type=file, please don't set multiple addresses
  default.grouplist = "127.0.0.1:8091"
  #degrade, current not support
  enableDegrade = false
  #disable seata
  disableGlobalTransaction = false
}

注意,这个tx这个名字可以自己改,但是application.yml中一定要与之对应,往下看

完整的file.conf 文件

transport {
  # tcp udt unix-domain-socket
  type = "TCP"
  #NIO NATIVE
  server = "NIO"
  #enable heartbeat
  heartbeat = true
  # the client batch send request enable
  enableClientBatchSendRequest = true
  #thread factory for netty
  threadFactory {
    bossThreadPrefix = "NettyBoss"
    workerThreadPrefix = "NettyServerNIOWorker"
    serverExecutorThread-prefix = "NettyServerBizHandler"
    shareBossWorker = false
    clientSelectorThreadPrefix = "NettyClientSelector"
    clientSelectorThreadSize = 1
    clientWorkerThreadPrefix = "NettyClientWorkerThread"
    # netty boss thread size,will not be used for UDT
    bossThreadSize = 1
    #auto default pin or 8
    workerThreadSize = "default"
  }
  shutdown {
    # when destroy server, wait seconds
    wait = 3
  }
  serialization = "seata"
  compressor = "none"
}
service {
  #transaction service group mapping
  vgroup_mapping.tx = "default"
  #only support when registry.type=file, please don't set multiple addresses
  default.grouplist = "127.0.0.1:8091"
  #degrade, current not support
  enableDegrade = false
  #disable seata
  disableGlobalTransaction = false
}

client {
  rm {
    asyncCommitBufferLimit = 10000
    lock {
      retryInterval = 10
      retryTimes = 30
      retryPolicyBranchRollbackOnConflict = true
    }
    reportRetryCount = 5
    tableMetaCheckEnable = false
    reportSuccessEnable = false
  }
  tm {
    commitRetryCount = 5
    rollbackRetryCount = 5
  }
  undo {
    dataValidation = true
    logSerialization = "jackson"
    logTable = "undo_log"
  }
  log {
    exceptionRate = 100
  }
}

registry.conf文件

注册选择type = eureka,然后配置eureka地址即可

registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  type = "eureka"

  nacos {
    serverAddr = "localhost"
    namespace = ""
    cluster = "default"
  }
  eureka {
    serviceUrl = "http://server01:8761/eureka/"
    application = "default"
    weight = "1"
  }
  redis {
    serverAddr = "localhost:6379"
    db = "0"
    password = ""
    cluster = "default"
    timeout = "0"
  }
  zk {
    cluster = "default"
    serverAddr = "127.0.0.1:2181"
    session.timeout = 6000
    connect.timeout = 2000
    username = ""
    password = ""
  }
  consul {
    cluster = "default"
    serverAddr = "127.0.0.1:8500"
  }
  etcd3 {
    cluster = "default"
    serverAddr = "http://localhost:2379"
  }
  sofa {
    serverAddr = "127.0.0.1:9603"
    application = "default"
    region = "DEFAULT_ZONE"
    datacenter = "DefaultDataCenter"
    cluster = "default"
    group = "SEATA_GROUP"
    addressWaitTime = "3000"
  }
  file {
    name = "file.conf"
  }
}

config {
  # file、nacos 、apollo、zk、consul、etcd3、springCloudConfig
  type = "file"

  nacos {
    serverAddr = "localhost"
    namespace = ""
    group = "SEATA_GROUP"
  }
  consul {
    serverAddr = "127.0.0.1:8500"
  }
  apollo {
    app.id = "seata-server"
    apollo.meta = "http://192.168.1.204:8801"
    namespace = "application"
  }
  zk {
    serverAddr = "127.0.0.1:2181"
    session.timeout = 6000
    connect.timeout = 2000
    username = ""
    password = ""
  }
  etcd3 {
    serverAddr = "http://localhost:2379"
  }
  file {
    name = "file.conf"
  }
}

修改application.yml

第一个方式: 注意,这个tx-service-group: 后面的tx一定要和上面配置中的tx一样.一定一定要一样

spring:
  cloud:
    alibaba:
      seata:
        tx-service-group: tx

第二个方式:

application.yml这个文件不指定tx-service-group,那么file.conf这个文件的vgroup_mapping.tx就必须修改为seata默认的形式 在这个源码中可以看到,如果你没有定义,那么你这个file.conf配置中必须设置为applicationName + "-fescar-service-group" 举例:我这个项目就必须设置为order-fescar-service-group

spring:
  application:
    name: order

都是坑踩出来的..............

新增数据源配置

一开始我最下面的mybatis的配置没有注释,就会发生添加语句执行找不到mapper 注释掉就可以了.

package com.gmaya.order.config;

import com.alibaba.druid.pool.DruidDataSource;
import io.seata.rm.datasource.DataSourceProxy;
import javax.sql.DataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.transaction.SpringManagedTransactionFactory;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;

/**
 * 数据源代理
 * @author GMaya
 */
@Configuration
public class DataSourceConfiguration {

    @Bean
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource druidDataSource(){
        DruidDataSource druidDataSource = new DruidDataSource();
        return druidDataSource;
    }

    @Primary
    @Bean("dataSource")
    public DataSourceProxy dataSource(DataSource druidDataSource){
        return new DataSourceProxy(druidDataSource);
    }

  /*  @Bean
    public SqlSessionFactory sqlSessionFactory(DataSourceProxy dataSourceProxy)throws Exception{
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(dataSourceProxy);
        sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources("classpath*:/mapper/*.xml"));
        sqlSessionFactoryBean.setTransactionFactory(new SpringManagedTransactionFactory());
        return sqlSessionFactoryBean.getObject();
    }*/

}

修改启动类

@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)

修改完将以上操作在pay中复制.

数据库新增表

因为我是模拟的, 所以,只要是操作数据库就行了,就没弄多个库,在一个数据库,一个表tb_user 此时在加一个seata需要的表undo_log

-- ----------------------------
-- Table structure for undo_log
-- ----------------------------
DROP TABLE IF EXISTS `undo_log`;
CREATE TABLE `undo_log`  (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `branch_id` bigint(20) NOT NULL,
  `xid` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `context` varchar(128) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `rollback_info` longblob NOT NULL,
  `log_status` int(11) NOT NULL,
  `log_created` datetime NOT NULL,
  `log_modified` datetime NOT NULL,
  `ext` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE,
  UNIQUE INDEX `ux_undo_log`(`xid`, `branch_id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 7 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;

-- ----------------------------
-- Records of undo_log
-- ----------------------------

SET FOREIGN_KEY_CHECKS = 1;

测试

order中调用pay创建一条数据,然后自己在创建一条语句. 在order方法上加上注解

@GlobalTransactional

启动order 启动pay, 测试!

pay日志: 添加数据成功没错,但是结果回滚了 order日志: 最终数据库还是没有添加进去

再测: 调用订单-->先本地添加数据, 然后在调用支付,让支付失败,看订单是否回滚 测试结果还是回滚. 自己一步一步一步一步敲出来的,希望我下次不要遇到这些问题.