从0到1 手把手搭建spring cloud alibaba 微服务大型应用框架（五） SEATA分布式事务篇（下）应用整合shardingsphere集成seata完整代码及订单-库存完整模拟案例-阿里云开发者社区

承接上文《从0到1 手把手搭建spring cloud alibaba 微服务大型应用框架（五） SEATA分布式事务篇（中）shardingshere 多库读写分离/分库分表下分布式事务完整代码及案例》

上文中没有集成seata的情况下，跑了正常扣除库存以及生成订单的情况，下面我们来模拟上图中扣除库存成功，但是生成订单的情况，由于没有集成分布式事务，所以理论的结果肯定是库存少了，但是订单没有生成

还是使用上文中写好的业务代码，不过这次在生成订单的时候手动抛出异常，代码如下

首先清空订单数据库和还原一下库存数据库，给商品id是1的商品初始化10 个数量

然后postman 执行该接口

查看执行结果

库存服务正常

订单服务报错

库存服务库存扣除了3，订单服务没有生产订单

结果符合预期，也就是没有分布式事务情况下，数据不一致了

服务集成seata at

seata-server 配置上传到nacos

如果要让seata 识别某个或者某些服务，需要提前将一些配置上传到nacos上，上传可以使用nacos-config.sh 脚本

然后执行以下命令

sh nacos-config.sh -h 127.0.0.1

-h 是nacos 所在ip/

在nacos-condig.sh 同级目录下创建config.txt

内容如下

transport.type=TCP
transport.server=NIO
transport.heartbeat=true
transport.enableClientBatchSendRequest=true
transport.threadFactory.bossThreadPrefix=NettyBoss
transport.threadFactory.workerThreadPrefix=NettyServerNIOWorker
transport.threadFactory.serverExecutorThreadPrefix=NettyServerBizHandler
transport.threadFactory.shareBossWorker=false
transport.threadFactory.clientSelectorThreadPrefix=NettyClientSelector
transport.threadFactory.clientSelectorThreadSize=1
transport.threadFactory.clientWorkerThreadPrefix=NettyClientWorkerThread
transport.threadFactory.bossThreadSize=1
transport.threadFactory.workerThreadSize=default
transport.shutdown.wait=3
service.vgroupMapping.mini-cloud-authentication-center_tx_group=default
service.vgroupMapping.mini-cloud-upms-center-biz_tx_group=default
service.vgroupMapping.mini-cloud-simulate-order-biz_tx_group=default
service.vgroupMapping.mini-cloud-simulate-goods-biz_tx_group=default
service.default.grouplist=127.0.0.1:8091
service.enableDegrade=false
service.disableGlobalTransaction=false
client.rm.asyncCommitBufferLimit=10000
client.rm.lock.retryInterval=10
client.rm.lock.retryTimes=30
client.rm.lock.retryPolicyBranchRollbackOnConflict=true
client.rm.reportRetryCount=5
client.rm.tableMetaCheckEnable=false
client.rm.tableMetaCheckerInterval=60000
client.rm.sqlParserType=druid
client.rm.reportSuccessEnable=false
client.rm.sagaBranchRegisterEnable=false
client.rm.tccActionInterceptorOrder=-2147482648
client.tm.commitRetryCount=5
client.tm.rollbackRetryCount=5
client.tm.defaultGlobalTransactionTimeout=60000
client.tm.degradeCheck=false
client.tm.degradeCheckAllowTimes=10
client.tm.degradeCheckPeriod=2000
client.tm.interceptorOrder=-2147482648
store.mode=db
store.lock.mode=db
store.session.mode=db
store.publicKey=
store.file.dir=file_store/data
store.file.maxBranchSessionSize=16384
store.file.maxGlobalSessionSize=512
store.file.fileWriteBufferCacheSize=16384
store.file.flushDiskMode=async
store.file.sessionReloadReadSize=100
store.db.datasource=druid
store.db.dbType=mysql
store.db.driverClassName=com.mysql.jdbc.Driver
store.db.url=jdbc:mysql://mini-cloud-mysql:3306/mini_cloud_seata?useUnicode=true&rewriteBatchedStatements=true
store.db.user=root
store.db.password=root
store.db.minConn=5
store.db.maxConn=30
store.db.globalTable=global_table
store.db.branchTable=branch_table
store.db.queryLimit=100
store.db.lockTable=lock_table
store.db.maxWait=5000
store.redis.mode=sentinel
store.redis.single.host=127.0.0.1
store.redis.single.port=6379
store.redis.sentinel.masterName=
store.redis.sentinel.sentinelHosts=
store.redis.maxConn=10
store.redis.minConn=1
store.redis.maxTotal=100
store.redis.database=0
store.redis.password=123456
store.redis.queryLimit=100
server.recovery.committingRetryPeriod=1000
server.recovery.asynCommittingRetryPeriod=1000
server.recovery.rollbackingRetryPeriod=1000
server.recovery.timeoutRetryPeriod=1000
server.maxCommitRetryTimeout=-1
server.maxRollbackRetryTimeout=-1
server.rollbackRetryTimeoutUnlockEnable=false
server.distributedLockExpireTime=10000
client.undo.dataValidation=true
client.undo.logSerialization=jackson
client.undo.onlyCareUpdateColumns=true
server.undo.logSaveDays=7
server.undo.logDeletePeriod=86400000
client.undo.logTable=undo_log
client.undo.compress.enable=true
client.undo.compress.type=zip
client.undo.compress.threshold=64k
log.exceptionRate=100
transport.serialization=seata
transport.compressor=none
metrics.enabled=false
metrics.registryType=compact
metrics.exporterList=prometheus
metrics.exporterPrometheusPort=9898

重点两个地方，第一是配置服务名

一般格式是服务名+_tx_group default是默认分组

第二是修改配置模式，我这里配置的是使用db，也就是连接mysql

执行命令后会看到参数都已经传到了nacos

订单服务集成seata

由于我们集成了shardingshpere读写分离分库分表，所以不能只用传统的seata，需要使用如下maven依赖

<dependency>
  <groupId>org.apache.shardingsphere</groupId>
   <artifactId>sharding-transaction-base-seata-at</artifactId>
</dependency>

 <dependency>
    <groupId>io.seata</groupId>
    <artifactId>seata-spring-boot-starter</artifactId>
 </dependency>

resources 目录下添加如下三个文件，库存服务也一样

file.conf

service {
  vgroupMapping.mini-cloud-simulate-order-biz_tx_group = "default" #修改事务组名称为：my_test_tx_group，和客户端自定义的名称对应
  #only support single node
  default.grouplist = "127.0.0.1:8091"
  #degrade current not support
  enableDegrade = false
  #disable
  disable = false
  disableGlobalTransaction = false
  #unit ms,s,m,h,d represents milliseconds, seconds, minutes, hours, days, default permanent
  max.commit.retry.timeout = "-1"
  max.rollback.retry.timeout = "-1"
}

registry.conf

registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  type = "nacos"
  loadBalance = "RandomLoadBalance"
  loadBalanceVirtualNodes = 10
  nacos {
    application = "seata-server"
    serverAddr = "127.0.0.1:8848"
    group = "SEATA_GROUP"
    namespace = ""
    cluster = "default"
    username = ""
    password = ""
  }
}

seata.conf

sharding {
  transaction.seata.at.enable = true
}
client  {
    application.id =  mini-cloud-simulate-order-biz
    transaction.service.group = mini-cloud-simulate-order-biz_tx_group
}

库存服务集成seata

maven 依赖同上

file.conf

service {
  vgroupMapping.mini-cloud-simulate-goods-biz_tx_group = "default" #修改事务组名称为：my_test_tx_group，和客户端自定义的名称对应
  #only support single node
  default.grouplist = "127.0.0.1:8091"
  #degrade current not support
  enableDegrade = false
  #disable
  disable = false
  #disable seata
  disableGlobalTransaction = false
  #unit ms,s,m,h,d represents milliseconds, seconds, minutes, hours, days, default permanent
  max.commit.retry.timeout = "-1"
  max.rollback.retry.timeout = "-1"
}

registry.conf

registry {
  # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
  type = "nacos"
  loadBalance = "RandomLoadBalance"
  loadBalanceVirtualNodes = 10
  nacos {
    application = "seata-server"
    serverAddr = "127.0.0.1:8848"
    group = "SEATA_GROUP"
    namespace = ""
    cluster = "default"
    username = ""
    password = ""
  }
}

seata.conf

sharding {
  transaction.seata.at.enable = true
}
client  {
    application.id =  mini-cloud-simulate-goods-biz
    transaction.service.group = mini-cloud-simulate-goods-biz_tx_group
}

两个服务添加seataFilter，解决xid不传递问题

SeataFilter.java

@Component
public class SeataFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) servletRequest;
        String xid = req.getHeader(RootContext.KEY_XID.toLowerCase());
        boolean isBind = false;
        if (StringUtils.isNotBlank(xid)) {
            RootContext.bind(xid);
            isBind = true;
        }
        try {
            filterChain.doFilter(servletRequest, servletResponse);
        } finally {
            if (isBind) {
                RootContext.unbind();
            }
        }
    }
    @Override
    public void destroy() {
    }
}

SeataXidRequestInterceptor.java

public class SeataXidRequestInterceptor implements RequestInterceptor {
    @Override
    public void apply(RequestTemplate template) {
        String xid = RootContext.getXID();
        if (StringUtils.isEmpty(xid)) {
            return;
        }
        List<String> fescarXid = new ArrayList<>();
        fescarXid.add(xid);
        template.header(RootContext.KEY_XID, fescarXid);
        System.err.println("添加XID:" + fescarXid);
    }
}

SeataConfiguration.java

@Configuration
public class SeataConfiguration {
    @Bean
    public RequestInterceptor requestInterceptor(){
        return new SeataXidRequestInterceptor();
    }
}