seata-server 1.3.0整合nacos，使用nacos做注册和配置中心

1. 前言

   1. 关于seata版本的选择和更详细的安装，可以参考 SpringCloud Alibaba之Seata入门及踩坑

   2. 本篇博客是整合nacos，nacos直接下载安装解压运行就可以了。

2. seata的下载:

   1. 可以去seata官网上面点击下载，然后找到对应版本去github上面下载，但是github上面懂得，速度老慢了。

   2. 也可以去sourceforge-seata上面下载，虽然也慢，起码不会跟github一样偶尔找不到的好。

      vxxx.zip和vxxx.tar.gz是对应系统和版本的源码，也可以下载下来，因为一些文件要从里面拿

      seata-server-x.x.x.zip和tar.gz是对应系统和版本的服务器，拿过来直接用的，必须下，源码随意

   3. 我自己下载下来几个版本(源码只有1.4.0的)，可以瞅一眼，这个云也许会快一点吧...

      https://wwa.lanzoui.com/b010hbq8j
      
      密码:seata

3. seata-server安装

   1. 解压下载下来seata-server。打开/seata/conf文件夹，其中主要修改的是registry.conf和fiel.conf，由于我们基于nacos，这里就不用管file.conf了。下面先将registry.conf备份，然后修改为：

      registry {
        type = "nacos"
        nacos {
          application = "seata-server"
          serverAddr = "127.0.0.1:8848"
          group = "SEATA_GROUP"
          namespace = ""
          cluster = "default"
          username = "nacos"
          password = "nacos"
        }
      }
      
      config {
        type = "nacos"
        nacos {
          serverAddr = "127.0.0.1:8848"
          namespace = ""
          group = "SEATA_GROUP"
          username = "nacos"
          password = "nacos"
        }
      }
      

      其中的含义：

      • registry：服务器要注册到nacos的位置(命名空间、集群什么的)。
      • config：seata服务器配置，这里需要去nacos上面拿配置，那么nacos上面没有，所以我们需要推上去。

   2. 解压下载下来的源码，打开文件夹/script/config-center下的config.txt，也可以直接复制。

      transport.type=TCP
      transport.server=NIO
      transport.heartbeat=true
      transport.enableClientBatchSendRequest=false
      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.my_test_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.sqlParserType=druid
      client.rm.reportSuccessEnable=false
      client.rm.sagaBranchRegisterEnable=false
      client.tm.commitRetryCount=5
      client.tm.rollbackRetryCount=5
      client.tm.defaultGlobalTransactionTimeout=60000
      client.tm.degradeCheck=false
      client.tm.degradeCheckAllowTimes=10
      client.tm.degradeCheckPeriod=2000
      store.mode=file
      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://127.0.0.1:3306/seata?useUnicode=true
      store.db.user=username
      store.db.password=password
      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.host=127.0.0.1
      store.redis.port=6379
      store.redis.maxConn=10
      store.redis.minConn=1
      store.redis.database=0
      store.redis.password=null
      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
      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.log.exceptionRate=100
      transport.serialization=seata
      transport.compressor=none
      metrics.enabled=false
      metrics.registryType=compact
      metrics.exporterList=prometheus
      metrics.exporterPrometheusPort=9898
      

      主要修改其中的：

      service.vgroupMapping.my_test_tx_group=default
      # 其中my_test_tx_group是可以自定义的且之后要与seata客户端中相匹配
      
      store.mode=file
      # 修改为db，下面修改到对应数据库的信息
      
      store.db.driverClassName=com.mysql.jdbc.Driver
      store.db.url=jdbc:mysql://127.0.0.1:3306/seata?useUnicode=true
      store.db.user=username
      store.db.password=password
      

   3. 打开源码中的script/config-center/nacos下的nacos-config.sh，也可以从下面复制。

      #!/usr/bin/env bash
      # Copyright 1999-2019 Seata.io Group.
      #
      # Licensed 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.
      
      while getopts ":h:p:g:t:u:w:" opt
      do
        case $opt in
        h)
          host=$OPTARG
          ;;
        p)
          port=$OPTARG
          ;;
        g)
          group=$OPTARG
          ;;
        t)
          tenant=$OPTARG
          ;;
        u)
          username=$OPTARG
          ;;
        w)
          password=$OPTARG
          ;;
        ?)
          echo " USAGE OPTION: $0 [-h host] [-p port] [-g group] [-t tenant] [-u username] [-w password] "
          exit 1
          ;;
        esac
      done
      
      if [[ -z ${host} ]]; then
          host=localhost
      fi
      if [[ -z ${port} ]]; then
          port=8848
      fi
      if [[ -z ${group} ]]; then
          group="SEATA_GROUP"
      fi
      if [[ -z ${tenant} ]]; then
          tenant=""
      fi
      if [[ -z ${username} ]]; then
          username=""
      fi
      if [[ -z ${password} ]]; then
          password=""
      fi
      
      nacosAddr=$host:$port
      contentType="content-type:application/json;charset=UTF-8"
      
      echo "set nacosAddr=$nacosAddr"
      echo "set group=$group"
      
      failCount=0
      tempLog=$(mktemp -u)
      function addConfig() {
        curl -X POST -H "${contentType}" "http://$nacosAddr/nacos/v1/cs/configs?dataId=$1&group=$group&content=$2&tenant=$tenant&username=$username&password=$password" >"${tempLog}" 2>/dev/null
        if [[ -z $(cat "${tempLog}") ]]; then
          echo " Please check the cluster status. "
          exit 1
        fi
        if [[ $(cat "${tempLog}") =~ "true" ]]; then
          echo "Set $1=$2 successfully "
        else
          echo "Set $1=$2 failure "
          (( failCount++ ))
        fi
      }
      
      count=0
      for line in $(cat $(dirname "$PWD")/config.txt | sed s/[[:space:]]//g); do
        (( count++ ))
      	key=${line%%=*}
          value=${line#*=}
      	addConfig "${key}" "${value}"
      done
      
      echo "========================================================================="
      echo " Complete initialization parameters,  total-count:$count ,  failure-count:$failCount "
      echo "========================================================================="
      
      if [[ ${failCount} -eq 0 ]]; then
      	echo " Init nacos config finished, please start seata-server. "
      else
      	echo " init nacos config fail. "
      fi
      

      可以直接修改下面这些，也可以执行时候使用参数形式给进去。

      if [[ -z ${host} ]]; then
          host=localhost
      fi
      if [[ -z ${port} ]]; then
          port=8848
      fi
      if [[ -z ${group} ]]; then
          group="SEATA_GROUP"
      fi
      if [[ -z ${tenant} ]]; then
          tenant=""
      fi
      if [[ -z ${username} ]]; then
          username=""
      fi
      if [[ -z ${password} ]]; then
          password=""
      fi
      

      其中tenant为命名空间，也即nacos上面的namespace。

   4. 运行nacos，然后windows下可以安装Git For Windows来运行sh文件将配置推上nacos。

   5. 打开nacos，点击配置管理，和自己填写对应的命名空间(""默认为public)，检查第二步中自定数据库和service.vgroupMapping.my_test_tx_group。那么里面的数据库呢？MySQL中没有seata数据库啊。下面来手动新建。

   6. 新建数据库seata（可以自己命名，nacos上面可以手动编辑的），新建三个表，sql代码官方也给出来了，在源码的script/server/db下的mysql.sql，如下

      -- -------------------------------- The script used when storeMode is 'db' --------------------------------
      -- the table to store GlobalSession data
      CREATE TABLE IF NOT EXISTS `global_table`
      (
          `xid`                       VARCHAR(128) NOT NULL,
          `transaction_id`            BIGINT,
          `status`                    TINYINT      NOT NULL,
          `application_id`            VARCHAR(32),
          `transaction_service_group` VARCHAR(32),
          `transaction_name`          VARCHAR(128),
          `timeout`                   INT,
          `begin_time`                BIGINT,
          `application_data`          VARCHAR(2000),
          `gmt_create`                DATETIME,
          `gmt_modified`              DATETIME,
          PRIMARY KEY (`xid`),
          KEY `idx_gmt_modified_status` (`gmt_modified`, `status`),
          KEY `idx_transaction_id` (`transaction_id`)
      ) ENGINE = InnoDB
        DEFAULT CHARSET = utf8;
      
      -- the table to store BranchSession data
      CREATE TABLE IF NOT EXISTS `branch_table`
      (
          `branch_id`         BIGINT       NOT NULL,
          `xid`               VARCHAR(128) NOT NULL,
          `transaction_id`    BIGINT,
          `resource_group_id` VARCHAR(32),
          `resource_id`       VARCHAR(256),
          `branch_type`       VARCHAR(8),
          `status`            TINYINT,
          `client_id`         VARCHAR(64),
          `application_data`  VARCHAR(2000),
          `gmt_create`        DATETIME(6),
          `gmt_modified`      DATETIME(6),
          PRIMARY KEY (`branch_id`),
          KEY `idx_xid` (`xid`)
      ) ENGINE = InnoDB
        DEFAULT CHARSET = utf8;
      
      -- the table to store lock data
      CREATE TABLE IF NOT EXISTS `lock_table`
      (
          `row_key`        VARCHAR(128) NOT NULL,
          `xid`            VARCHAR(96),
          `transaction_id` BIGINT,
          `branch_id`      BIGINT       NOT NULL,
          `resource_id`    VARCHAR(256),
          `table_name`     VARCHAR(32),
          `pk`             VARCHAR(36),
          `gmt_create`     DATETIME,
          `gmt_modified`   DATETIME,
          PRIMARY KEY (`row_key`),
          KEY `idx_branch_id` (`branch_id`)
      ) ENGINE = InnoDB
        DEFAULT CHARSET = utf8;
      

   7. 运行seata-server/bin/seata-server.bat，查看nacos上面服务管理中是否有对应seata-server服务启动。

   8. 至此，seata-server服务端配置完成。

4. seata客户端准备与概况

   在seata的提供者有了之后，我们需要来创建seata客户端。这里使用微服务模块的方式来配置。

   注：在AT模式下，各自客户端中操作每个数据库中必须要有一个undo_log表，创建脚本在源码script/client/at/db/mysql.sql,如下:

   -- for AT mode you must to init this sql for you business database. the seata server not need it.
   CREATE TABLE IF NOT EXISTS `undo_log`
   (
       `branch_id`     BIGINT(20)   NOT NULL COMMENT 'branch transaction id',
       `xid`           VARCHAR(100) NOT NULL COMMENT 'global transaction id',
       `context`       VARCHAR(128) NOT NULL COMMENT 'undo_log context,such as serialization',
       `rollback_info` LONGBLOB     NOT NULL COMMENT 'rollback info',
       `log_status`    INT(11)      NOT NULL COMMENT '0:normal status,1:defense status',
       `log_created`   DATETIME(6)  NOT NULL COMMENT 'create datetime',
       `log_modified`  DATETIME(6)  NOT NULL COMMENT 'modify datetime',
       UNIQUE KEY `ux_undo_log` (`xid`, `branch_id`)
   ) ENGINE = InnoDB
     AUTO_INCREMENT = 1
     DEFAULT CHARSET = utf8 COMMENT ='AT transaction mode undo table';
   

   ---

   由于篇幅过长，简单来描述测试过程就是：

   • 建立两个独立的数据库
   • 在两个提供者中对各自的数据库做插入或者更新操作。
   • 在消费者调用的方法或者类上面注解@GlobalTransactional
   • 在调用完提供者处理数据库的方法后，手动抛出异常。
   • 数据库中完成回滚。

   ---

参考：

• seata1.3整合nacos 1.3.1配置

• 一文讲清楚 seata DataSourceProxy 的使用

• 分布式事务 | RuoYi

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