SpringCloud 周边服务学习

zipkin 链路追踪

越来越多的微服务存在，他们之间也会有更加复杂的调用关系。
这个调用关系，仅仅通过观察代码，会越来越难以识别，就需要通过 zipkin 服务链路追踪服务器 这个东西来用图片进行识别各个服务的调用关系

1.  启动zipkin-server
   

   java -jar zipkin-server-2.10.1-exec.jar

2. pom.xml 为各个服务增加
   

       <!--zipkin-->
           <dependency>
               <groupId>org.springframework.cloud</groupId>
               <artifactId>spring-cloud-starter-zipkin</artifactId>
           </dependency>

3. application.yml 为各个需要追踪的服务增加
   

   spring:
     application:
       name: index-codes-service
   
   #增加 zipkin 地址
     zipkin:
       base-url: http://localhost:9411
   
   eureka:
     client:
       serviceUrl:
         defaultZone: http://localhost:8761/eureka/

   eureka:
     client:
       serviceUrl:
         defaultZone: http://localhost:8761/eureka/
   spring:
     application:
       name: index-data-service
     zipkin:
       base-url: http://localhost:9411

4. Application增加 Sampler 的Bean
   

   @SpringBootApplication
   @EnableEurekaClient
   @EnableCaching
   public class IndexCodesApplication {
       public static void main(String[] args) {
            
       }
   //增加Sampler的Bean
       @Bean
       public Sampler defaultSampler() {
           return Sampler.ALWAYS_SAMPLE;
       }
   }

5. 链路追踪地址
   

   http://localhost:9411/zipkin/dependency/

配置服务器 ConfigServer

1. 创建子模块index-config-server
2. pom.xml
   

   <?xml version="1.0" encoding="UTF-8"?>
    
   <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
       <parent>
           <artifactId>trendParentProject</artifactId>
           <groupId>cn.how2j.trend</groupId>
           <version>0.0.1-SNAPSHOT</version>
       </parent>
       <modelVersion>4.0.0</modelVersion>
    
       <artifactId>index-config-server</artifactId>
    
       <dependencies>
           <dependency>
               <groupId>org.springframework.cloud</groupId>
               <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
           </dependency>
           <dependency>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter-web</artifactId>
           </dependency>
   #spring-cloud-config-server 的依赖
           <dependency>
               <groupId>org.springframework.cloud</groupId>
               <artifactId>spring-cloud-config-server</artifactId>
           </dependency>
   
       </dependencies>
   </project>

3. 启动类 Application 增加 @EnableConfigServer
   

   @SpringBootApplication
   @EnableConfigServer
   @EnableDiscoveryClient
   @EnableEurekaClient
   public class IndexConfigServerApplication {
       public static void main(String[] args) {
           new SpringApplicationBuilder(IndexConfigServerApplication.class).properties("server.port=" + port).run(args);
       }
   }

4. application.yml
   

   spring:
     application:
       name: index-config-server
     cloud:
       config:
   #label 表示 分支
         label: master
         server:
           git:
   #uri 表示 git 地址：
             uri: https://github.com/how2j/trendConfig/
   #searchPaths 表示目录
             searchPaths: respo
   eureka:
     client:
       serviceUrl:
         defaultZone: http://localhost:8761/eureka/

   

5. 更改所需要配置的服务
   pom.xml 添加对spring-cloud-starter-config 的依赖
   

   <!--config-client-->
           <dependency>
               <groupId>org.springframework.cloud</groupId>
               <artifactId>spring-cloud-starter-config</artifactId>
           </dependency>

   增加bootstrap.yml 把 eureka 地址信息移动到了 bootstrap.yml 里
   
   bootstrap.yml 和 application.yml 的区别，简单说就是前者先启动，并且一些系统方面的配置需要在 bootstrap.yml 里进行配置
   
   

   spring:
     cloud:
       config:
         label: master
         profile: dev
         discovery:
           enabled:  true
   #提供了 serviceId: index-config-server, 这个是配置服务器在 eureka server 里的服务名称，这样就可以定位 config-server了
           serviceId:  index-config-server
   eureka:
     client:
       serviceUrl:
         defaultZone: http://localhost:8761/eureka/

   增加注解 @Value("${version}") 

   @Controller
   public class ViewController {
   #增加了个注解来获取版本信息
       @Value("${version}")
       String version;
       @GetMapping("/")
       public String view(Model m) throws Exception {
           m.addAttribute("version", version);
           return "view";
       }
   }

rabbitMQ 数据广播

服务业务逻辑
　　

1. 通过运行FreshConfigUtil类， 以 post 方式访问地址 http://localhost:8041/actuator/bus-refresh，通知 view:8041 刷新配置。

2. view:8041 告诉 index-config-server 获取新的配置数据

3. index-config-server 从 git 拿到数据，返回给 view:8041

4. view:8041 拿到数据不仅自己用了，还发给了 rabbitMQ

5. rabbitMQ 拿到这个数据广播给其他的，比如 view:8042

1. 启动RabbitMQ
2. 为view服务添加pom.xml
   

   <artifactId>trend-trading-backtest-view</artifactId>
       <dependencies>
   #用于访问路径：/actuator/bus-refresh， 这个地址就用来通知它去更新配置服务器
           <dependency>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter-actuator</artifactId>
           </dependency>
   #多了spring-cloud-starter-bus-amqp 用于支持 rabbitmq
           <dependency>
               <groupId>org.springframework.cloud</groupId>
               <artifactId>spring-cloud-starter-bus-amqp</artifactId>
           </dependency>
       </dependencies>
    

3. bootstrap.yml

   spring:
     cloud:
       config:
         label: master
         profile: dev
         discovery:
           enabled:  true
           serviceId:  index-config-server
   #新增 but总线配置
       bus:
         enabled: true
         trace:
           enabled: true
   #新增 rabbitMQ 配置
   rabbitmq:
     host: localhost
     port: 5672
     username: guest
     password: guest
   eureka:
     client:
       serviceUrl:
         defaultZone: http://localhost:8761/eureka/

4. application.yml

   spring:
     application:
       name: trend-trading-backtest-view
     thymeleaf:
       mode: LEGACYHTML5
       encoding: UTF-8
       content-type: text/html
       cache: false
     zipkin:
       base-url: http://localhost:9411
   #增加management
   #其作用是允许访问：/actuator/bus-refresh
   management:
     endpoints:
       web:
         exposure:
           include: "*"
         cors:
           allowed-origins: "*"
           allowed-methods: "*"

5. 增加 rabbitMQ 端口判断。5672 是 rabbitMQ 服务器的端口， 15672 是 rabbitMQ 自带的某个web工具的端口

           int rabbitMQPort = 5672;
           if(NetUtil.isUsableLocalPort(rabbitMQPort)) {
               System.err.printf("检查到端口%d 未启用，判断 rabbitMQ 服务器没有启动，本服务无法使用，故退出%n", rabbitMQPort );
               System.exit(1);
           }

6. 为view增加注解 @RefreshScope 表示允许刷新

   import org.springframework.beans.factory.annotation.Value;
   import org.springframework.cloud.context.config.annotation.RefreshScope;
   import org.springframework.stereotype.Controller;
   import org.springframework.ui.Model;
   import org.springframework.web.bind.annotation.GetMapping;
     
   @Controller
   @RefreshScope
   public class ViewController {
       @Value("${version}")
       String version;
       @GetMapping("/")
       public String view(Model m) throws Exception {
           m.addAttribute("version", version);
           return "view";
       }
   }

7. post访问工具

   import java.util.HashMap;  
   import cn.hutool.http.HttpUtil;  
   public class FreshConfigUtil {  
       public static void main(String[] args) {
           HashMap<String,String> headers =new HashMap<>();
           headers.put("Content-Type", "application/json; charset=utf-8");
           System.out.println("因为要去git获取，还要刷新index-config-server, 会比较卡，所以一般会要好几秒才能完成，请耐心等待");
     
           String result = HttpUtil.createPost("http://localhost:8041/actuator/bus-refresh").addHeaders(headers).execute().body();
           System.out.println("result:"+result);
           System.out.println("refresh 完成");
       }
   }

8. 对服务链路追踪的影响

   因为视图服务进行了改造，支持了 rabbitMQ, 那么在默认情况下，它的信息就不会进入 Zipkin了。 在Zipkin 里看不到视图服务的资料了。
   为了解决这个问题，在启动 Zipkin 的时候 带一个参数就好了：--zipkin.collector.rabbitmq.addresses=localhost

   现在改成

   java -jar zipkin-server-2.10.1-exec.jar --zipkin.collector.rabbitmq.addresses=localhost

    

断路器监控 

1. 新建子模块 index-hystrix-dashboard
   
   
   
2. pom.xml
   

   <?xml version="1.0" encoding="UTF-8"?>
   <project xmlns="http://maven.apache.org/POM/4.0.0"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
       <parent>
           <artifactId>trendParentProject</artifactId>
           <groupId>cn.how2j.trend</groupId>
           <version>0.0.1-SNAPSHOT</version>
       </parent>
       <modelVersion>4.0.0</modelVersion>
    
       <artifactId>index-hystrix-dashboard</artifactId>
    
       <dependencies>
           <dependency>
               <groupId>org.springframework.cloud</groupId>
               <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
           </dependency>
           <dependency>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter-web</artifactId>
           </dependency>
           <dependency>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter-actuator</artifactId>
           </dependency>
           <dependency>
               <groupId>org.springframework.cloud</groupId>
               <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
           </dependency>
           <dependency>
               <groupId>org.springframework.cloud</groupId>
               <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
           </dependency>
    
       </dependencies>
    
   </project>

3. 断路器监控启动器 IndexHystrixDashboardApplication
   

   import org.springframework.boot.autoconfigure.SpringBootApplication;
   import org.springframework.boot.builder.SpringApplicationBuilder;
   import org.springframework.cloud.netflix.hystrix.dashboard.EnableHystrixDashboard;
   import cn.hutool.core.util.NetUtil;
   
   @SpringBootApplication
   //使用 @EnableHystrixDashboard 来启动断路器监控台
   @EnableHystrixDashboard
   public class IndexHystrixDashboardApplication {
       public static void main(String[] args) {
           int port = 8070;
           int eurekaServerPort = 8761;
           if(NetUtil.isUsableLocalPort(eurekaServerPort)) {
               System.err.printf("检查到端口%d 未启用，判断 eureka 服务器没有启动，本服务无法使用，故退出%n", eurekaServerPort );
               System.exit(1);
           }
           if(!NetUtil.isUsableLocalPort(port)) {
               System.err.printf("端口%d被占用了，无法启动%n", port );
               System.exit(1);
           }
           new SpringApplicationBuilder(IndexHystrixDashboardApplication.class).properties("server.port=" + port).run(args);
       }
   }

   
   
   
4. application.yml
   

   spring:
     application:
       name: index-hystrix-dashboard

5. 对需要进行监控的服务进行修改
   pom.xml 增加监控接口
   

   <!--监控接口-->
           <dependency>
               <groupId>org.springframework.boot</groupId>
               <artifactId>spring-boot-starter-actuator</artifactId>
           </dependency>

6. 为需要监控的服务的启动类增加注解: @EnableCircuitBreaker，用于把断路信息分享出来
   

   @EnableCircuitBreaker
   public class TrendTradingBackTestServiceApplication {
       public static void main(String[] args) {
            new SpringApplicationBuilder(TrendTradingBackTestServiceApplication.class).properties("server.port=" + port).run(args);
       }
   }

7. 更改需要监控的服务的application.yml
   

   spring:
     application:
       name:  trend-trading-backtest-service
     zipkin:
       base-url: http://localhost:9411
   feign.hystrix.enabled: true
   #增加如下内容，使之可以访问
   management:
     endpoints:
       web:
         exposure:
           include: "*"
         cors:
           allowed-origins: "*"
           allowed-methods: "*"

8. 监控地址
   

   http://localhost:8070/hystrix

   输入参数

   http://localhost:8051/actuator/hystrix.stream