【Spring Cloud Alibaba】【Hoxton】Seata从入门到实战

心已赠人 2023-07-17 15:46 18阅读 0赞

[1 Nacos 入门-配置中心-集群][1 Nacos _-_-]  
[2 Sentinel 入门-限流-降级（一）][2 Sentinel _-_-]  
[3 Sentinel 热点规则-@SentinelResource-熔断-持久化（二）][3 Sentinel _-_SentinelResource-_-]  
[4 Seata从入门到实战][1 Nacos _-_-]

# 1 简介 #

官网地址：https://seata.io/zh-cn/

## 1.1 Seata ##

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。

## 1.2 术语 ##

(1) TC - 事务协调者  
维护全局和分支事务的状态，驱动全局事务提交或回滚。

(2) TM - 事务管理器  
定义全局事务的范围：开始全局事务、提交或回滚全局事务。

(3) RM - 资源管理器  
管理分支事务处理的资源，与TC交谈以注册分支事务和报告分支事务的状态，并驱动分支事务提交或回滚。

## 1.3 流程简介 ##

(1) TM向TC申请开启一个全局事务,全局事务创建成功并生成个全局唯一的XID  
(2) XID在微服务调用链路的上下文中传播;  
(3) RM向TC注册分支事务,将其纳入XID对应全局事务的管辖  
(4) TM向TC发起针对XID的全局提交或回滚决议  
(5) TC调度XID下管辖的全部分支事务完成提交或回滚请求  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70]

# 2 安装 #

## 2.1 环境准备 ##

192.168.0.38 mysql
    192.168.0.39 java8 nacos seata

## 2.2 解压 ##

tar -zxvf seata-server-0.9.0.tar.gz

## 2.3 修改配置文件 ##

cd /usr/local/seata/conf
    vim file.conf

#(1) 修改service模块的分组zrs_tx_group
    #(2) 修改store模块
    vgroup_mapping.my_test_tx_group = "zrs_tx_group"
    
    mode = "db"
    
    url = "jdbc:mysql://192.168.0.38:3306/seata"
    user = "root"
    password = "123456"

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![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 2]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 3]

## 2.4 建数据库![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 4] ##

## 2.5 在数据库里面建表 ##

#SQL地址
    https://github.com/seata/seata/blob/v0.9.0/server/src/main/resources/db_store.sql
    
    -- the table to store GlobalSession data
    drop table if exists `global_table`;
    create table `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`)
    );
    -- the table to store BranchSession data
    drop table if exists `branch_table`;
    create table `branch_table` (
    `branch_id` bigint not null,
    `xid` varchar(128) not null,
    `transaction_id` bigint ,
    `resource_group_id` varchar(32),
    `resource_id` varchar(256) ,
    `lock_key` varchar(128) ,
    `branch_type` varchar(8) ,
    `status` tinyint,
    `client_id` varchar(64),
    `application_data` varchar(2000),
    `gmt_create` datetime,
    `gmt_modified` datetime,
    primary key (`branch_id`),
    key `idx_xid` (`xid`)
    );
    -- the table to store lock data
    drop table if exists `lock_table`;
    create table `lock_table` (
    `row_key` varchar(128) not null,
    `xid` varchar(96),
    `transaction_id` long ,
    `branch_id` long,
    `resource_id` varchar(256) ,
    `table_name` varchar(32) ,
    `pk` varchar(36) ,
    `gmt_create` datetime ,
    `gmt_modified` datetime,
    primary key(`row_key`)
    );

## 2.6 修改注册文件 ##

cd /usr/local/seata/conf
    vim registry.conf
    
    
    # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
    type = "nacos"
    
    nacos { 
        serverAddr = "192.168.0.39:8848"
        namespace = ""
        cluster = "default"
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 5]

## 2.7 启动 ##

#启动nacos
    cd /usr/local/nacos/bin
    bash startup.sh -m standalone
    #启动seata
    cd /usr/local/seata/bin
    nohup ./seata-server.sh  >seata.log 2>&1 &

![在这里插入图片描述][20200323000203194.png]

# 3 场景实战 #

这里我们会创建三个服务,一个订单服务,一个库存服务,一个账户服务。  
当用户下单时,会在订单服务中创建一个订单,然后通过远程调用库存服务来扣减下单商品的库存,再通过远程调用账户服务来扣减用户账户里面的余额,最后在订单服务中修改订单状态为已完成。

## 3.1 数据库环境准备 ##

(1) 创建db\_account、db\_order、db\_storage数据库  
![在这里插入图片描述][20200323000218684.png]  
(2) 在db\_order下创建表

CREATE TABLE `t_order` (
      `id` int(11) NOT NULL AUTO_INCREMENT,
      `user_id` int(11) DEFAULT NULL,
      `product_id` int(11) DEFAULT NULL,
      `count` int(11) DEFAULT NULL,
      `money` decimal(11,0) DEFAULT NULL,
      `status` int(1) NOT NULL,
      PRIMARY KEY (`id`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;

(3) 在db\_storage下创建表

CREATE TABLE `t_storage` (
      `id` int(11) NOT NULL AUTO_INCREMENT,
      `product_id` int(11) DEFAULT NULL,
      `total` int(11) DEFAULT NULL,
      `used` int(11) DEFAULT NULL,
      `residue` int(11) NOT NULL COMMENT '剩余库存',
      PRIMARY KEY (`id`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;

(4)在db\_account下建表

CREATE TABLE `t_account` (
      `id` int(11) NOT NULL AUTO_INCREMENT,
      `user_id` int(11) DEFAULT NULL COMMENT '用户ID',
      `total` decimal(11,0) DEFAULT NULL COMMENT '总金额',
      `used` decimal(11,0) DEFAULT NULL COMMENT '已用金额',
      `residue` decimal(11,0) DEFAULT NULL COMMENT '剩余金额',
      PRIMARY KEY (`id`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;

(5) 在db\_account、db\_order、db\_storage 创建回滚日志表

drop table `undo_log`;
    CREATE TABLE `undo_log` (
    `id` bigint(20) NOT NULL AUTO_INCREMENT,
    `branch_id` bigint(20) NOT NULL,
    `xid` varchar(100) NOT NULL,
    `context` varchar(128) 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) DEFAULT NULL,
    PRIMARY KEY (`id`),
    UNIQUE KEY `ux_undo_log` (`xid`,`branch_id`)
    ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

(6) 最终结果  
![在这里插入图片描述][20200323000311870.png]

## 3.2 创建公用工程 ##

(1) 3个表的实体 略  
(2) 统一返回类

@Data
    @AllArgsConstructor
    @NoArgsConstructor
    public class ResponseResult { 
        private String msg;
        private Integer status;
        private Object data;
        public static ResponseResult success(Object object){ 
            return new ResponseResult("SUCCESS",200,object);
        }
        public static ResponseResult fail(String msg){ 
            return new ResponseResult(msg, 500,null);
        }
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 6]

## 3.3 创建order工程 ##

(1) pom

<dependencies>
        
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-seata</artifactId>
            <exclusions>
                <exclusion>
                    <artifactId>seata-all</artifactId>
                    <groupId>io.seata</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>io.seata</groupId>
            <artifactId>seata-all</artifactId>
            <version>0.9.0</version>
        </dependency>
        
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
            <scope>true</scope>
        </dependency>
        
        <dependency>
            <groupId>spring-cloud-alibaba</groupId>
            <artifactId>common</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        
        
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.1</version>
        </dependency>
        
        
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper-spring-boot-starter</artifactId>
            <version>2.1.5</version>
        </dependency>
        
        
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.10</version>
        </dependency>
        
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
    </dependencies>

(2) application.yml

server:
      port: 9006
    spring:
      application:
        name: order
      cloud:
        alibaba:
          seata:
            #自定义组
            tx-service-group: zrs_tx_group
        nacos:
          discovery:
            server-addr: 192.168.0.39:8848
      datasource:
        url:  jdbc:mysql://192.168.0.38:3306/db_order?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=true
        username: root
        password: 123456
        driver-class-name: com.mysql.jdbc.Driver
        type: com.alibaba.druid.pool.DruidDataSource
    feign:
      hystrix:
        enabled: true

(3) DataSourceProxyConfig

@Configuration
    public class DataSourceProxyConfig { 
        @Bean
        @ConfigurationProperties(prefix = "spring.datasource")
        public DruidDataSource druidDataSource() { 
            return new DruidDataSource();
        }
        /** * 必须配置数据源代理 */
        @Primary
        @Bean
        public DataSourceProxy dataSource(DruidDataSource druidDataSource) { 
            return new DataSourceProxy(druidDataSource);
        }
    }

(4) 创建file.conf，改service、改数据库  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 7]  
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![在这里插入图片描述][20200323000431425.png]

transport { 
      # tcp udt unix-domain-socket
      type = "TCP"
      #NIO NATIVE
      server = "NIO"
      #enable heartbeat
      heartbeat = true
      #thread factory for netty
      thread-factory { 
        boss-thread-prefix = "NettyBoss"
        worker-thread-prefix = "NettyServerNIOWorker"
        server-executor-thread-prefix = "NettyServerBizHandler"
        share-boss-worker = false
        client-selector-thread-prefix = "NettyClientSelector"
        client-selector-thread-size = 1
        client-worker-thread-prefix = "NettyClientWorkerThread"
        # netty boss thread size,will not be used for UDT
        boss-thread-size = 1
        #auto default pin or 8
        worker-thread-size = 8
      }
      shutdown { 
        # when destroy server, wait seconds
        wait = 3
      }
      serialization = "seata"
      compressor = "none"
    }
    service { 
      #vgroup->rgroup
      vgroup_mapping.zrs_tx_group = "default"
      #only support single node
      default.grouplist = "127.0.0.1:8091"
      #degrade current not support
      enableDegrade = false
      #disable
      disable = 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"
    }
    client { 
      async.commit.buffer.limit = 10000
      lock { 
        retry.internal = 10
        retry.times = 30
      }
      report.retry.count = 5
      tm.commit.retry.count = 1
      tm.rollback.retry.count = 1
    }
    ## transaction log store
    store { 
      ## store mode: file、db
      mode = "file"
      ## file store
      file { 
        dir = "sessionStore"
        # branch session size , if exceeded first try compress lockkey, still exceeded throws exceptions
        max-branch-session-size = 16384
        # globe session size , if exceeded throws exceptions
        max-global-session-size = 512
        # file buffer size , if exceeded allocate new buffer
        file-write-buffer-cache-size = 16384
        # when recover batch read size
        session.reload.read_size = 100
        # async, sync
        flush-disk-mode = async
      }
      ## database store
      db { 
        ## the implement of javax.sql.DataSource, such as DruidDataSource(druid)/BasicDataSource(dbcp) etc.
        datasource = "dbcp"
        ## mysql/oracle/h2/oceanbase etc.
        db-type = "mysql"
        driver-class-name = "com.mysql.jdbc.Driver"
        url = "jdbc:mysql://192.168.0.38:3306/seata"
        user = "root"
        password = "123456"
        min-conn = 1
        max-conn = 3
        global.table = "global_table"
        branch.table = "branch_table"
        lock-table = "lock_table"
        query-limit = 100
      }
    }
    lock { 
      ## the lock store mode: local、remote
      mode = "remote"
      local { 
        ## store locks in user's database
      }
      remote { 
        ## store locks in the seata's server
      }
    }
    recovery { 
      #schedule committing retry period in milliseconds
      committing-retry-period = 1000
      #schedule asyn committing retry period in milliseconds
      asyn-committing-retry-period = 1000
      #schedule rollbacking retry period in milliseconds
      rollbacking-retry-period = 1000
      #schedule timeout retry period in milliseconds
      timeout-retry-period = 1000
    }
    transaction { 
      undo.data.validation = true
      undo.log.serialization = "jackson"
      undo.log.save.days = 7
      #schedule delete expired undo_log in milliseconds
      undo.log.delete.period = 86400000
      undo.log.table = "undo_log"
    }
    ## metrics settings
    metrics { 
      enabled = false
      registry-type = "compact"
      # multi exporters use comma divided
      exporter-list = "prometheus"
      exporter-prometheus-port = 9898
    }
    support { 
      ## spring
      spring { 
        # auto proxy the DataSource bean
        datasource.autoproxy = false
      }
    }

(5) 注册器registry.conf  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 9]

registry { 
      # file 、nacos 、eureka、redis、zk、consul、etcd3、sofa
      type = "nacos"
    
      nacos { 
        serverAddr = "192.168.0.39:8848"
        namespace = ""
        cluster = "default"
      }
      eureka { 
        serviceUrl = "http://localhost:8761/eureka"
        application = "default"
        weight = "1"
      }
      redis { 
        serverAddr = "localhost:6379"
        db = "0"
      }
      zk { 
        cluster = "default"
        serverAddr = "127.0.0.1:2181"
        session.timeout = 6000
        connect.timeout = 2000
      }
      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
      type = "file"
      nacos { 
        serverAddr = "localhost"
        namespace = ""
      }
      consul { 
        serverAddr = "127.0.0.1:8500"
      }
      apollo { 
        app.id = "seata-server"
        apollo.meta = "http://192.168.1.204:8801"
      }
      zk { 
        serverAddr = "127.0.0.1:2181"
        session.timeout = 6000
        connect.timeout = 2000
      }
      etcd3 { 
        serverAddr = "http://localhost:2379"
      }
      file { 
        name = "file.conf"
      }
    }

(6) AccountService、StorageService

@FeignClient(value = "account")
    @Service
    public interface AccountService { 
        @PostMapping(value = "/account/decrease")
        ResponseResult decrease(@RequestParam("userId") Integer userID, @RequestParam("money") BigDecimal money);
    }
    
    @FeignClient(value = "storage")
    @Service
    public interface StorageService { 
        @PostMapping(value = "/storage/decrease")
        ResponseResult decrease(@RequestParam("productId") Integer productId, @RequestParam("count") Integer count);
    }

(7)OrderMapper

@Mapper
    public interface OrderMapper extends BaseMapper<OrderEntity> { 
    
    }

(8) 核心流程类OrderService

@Service
    @Slf4j
    public class OrderService { 
    
        @Autowired
        private OrderMapper orderMapper;
    
        @Autowired
        private StorageService storageService;
    
        @Autowired
        private AccountService accountService;
    
    
        public void create(OrderEntity order){ 
    
            log.info("接收到【订单】:"+order.toString());
    
            log.info("【1】新建订单开始");
            orderMapper.insertSelective(order);
    
            log.info("【2】调取【库存微服务】进行商品扣减【开始】");
            storageService.decrease(order.getProductID(), order.getCount());
    
            log.info("【3】调取【账户微服务】进行金额的扣减【开始】");
            accountService.decrease(order.getUserID(), order.getMoney());
    
            log.info("【4】 修改订单的状态开始");
            order.setStatus(1);
            orderMapper.updateByPrimaryKeySelective(order);
    
        }
    }

(9) 主启动类

@SpringBootApplication
    @MapperScan("com.order.mapper")
    @EnableFeignClients
    @EnableDiscoveryClient
    public class OrderApplication { 
        public static void main(String[] args) { 
            SpringApplication.run(OrderApplication.class);
        }
    }

## 3.4 根据order项目创建storage工程 ##

\#可以访问文章底部的GITHUB  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 10]

## 3.5根据order项目创建account工程 ##

\#可以访问文章底部的GITHUB  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 11]

## 3.6 准备数据 ##

(1) storage  
![在这里插入图片描述][20200323000623228.png]  
(2) account  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 12]

## 3.7 测试 ##

(1) 启动storage、account、order服务  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MTI1OTk5_size_16_color_FFFFFF_t_70 13]  
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(2) postman测试

{ 
        "userID":1,
        "productID":1,
        "count":2,
        "money":100,
        "status":0
    }

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![在这里插入图片描述][2020032300065967.png]  
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## 3.8 异常测试 ##

(1) 修改OrderService  
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(2) postman测试  
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# LAST GITHUB #

#分支Seata-release-v1.0
    https://github.com/zhurongsheng666/spring-cloud-alibaba

[1 Nacos _-_-]: https://blog.csdn.net/qq_34125999/article/details/105039301
[2 Sentinel _-_-]: https://blog.csdn.net/qq_34125999/article/details/105009001
[3 Sentinel _-_SentinelResource-_-]: https://blog.csdn.net/qq_34125999/article/details/105020919
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