SpringCloud 服务链路追踪Sleuth

微服务架构是通过业务来划分服务的，对外暴露的接口，可能需要很多个服务协同才能完成一个接口功能，如果链路上任何一个服务出现问题，都会形成导致接口调用失败。此时查找出现问题的微服务是很困难的。Spring Cloud Sleuth主要功能就是在分布式系统中提供追踪解决方案，并且兼容支持了 zipkin。

对于zipkin,pinpoint,以及skywalking如何选型，可以移步这里查看。

说明

构建三个工程，分别为
zipkin服务端，查看客户端接口调用情况。
client客户端，对外提供接口，供其他微服务调用。
client2客户端，和client一样，二者互相调用。

构建服务端

新建项目：springcloud-sleuth-server
因为插件选项里面没有zipkin服务端，需要手动修改pom.xml文件，添加依赖

<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">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.csdn</groupId>
	<artifactId>springcloud-sleuth-server</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.10.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
		<spring-cloud.version>Edgware.SR2</spring-cloud.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>
		<dependency>
			<groupId>io.zipkin.java</groupId>
			<artifactId>zipkin-server</artifactId>
		</dependency>
		<dependency>
			<groupId>io.zipkin.java</groupId>
			<artifactId>zipkin-autoconfigure-ui</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>${spring-cloud.version}</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
</project>

重命名application.yml，内容为

server:
  port: 8080

启动java文件只需要添加一个注解@EnableZipkinServer

构建客户端

新建项目：springcloud-sleuth-client
手动修改pom.xml文件，添加依赖

<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">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.csdn</groupId>
	<artifactId>springcloud-sleuth-client</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.10.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
		<spring-cloud.version>Edgware.SR2</spring-cloud.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-zipkin</artifactId>
		</dependency>
	</dependencies>

	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>${spring-cloud.version}</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

重命名application.yml，内容为

server:
  port: 8081
spring:
  zipkin:
    base-url: http://localhost:8080
  application:
    name: service-zipkin-client

启动类SpringCloudSleuthClient.java添加Bean的注入。

    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }
	
    @Bean
    public AlwaysSampler defaultSampler(){
        return new AlwaysSampler();
    }

新建一个测试类TestController

@RestController
public class TestController {

    @Autowired
    private RestTemplate restTemplate;
	
    @RequestMapping("/clientto02")
    public String callHome(){
        return restTemplate.getForObject("http://localhost:8082/client02", String.class);
    }
	
    @RequestMapping("/client")
    public String info(){
        return "client";
    }
    
}

第二个客户端

直接复制client项目，新名称使用springcloud-sleuth-client02
修改application.yml中的端口

server:
  port: 8082
spring:
  zipkin:
    base-url: http://localhost:8080
  application:
    name: service-zipkin-client02

修改TestController.java中对外公布接口名称

@RestController
public class TestController {

    @Autowired
    private RestTemplate restTemplate;
	
    @RequestMapping("/client2to1")
    public String callHome(){
        return restTemplate.getForObject("http://localhost:8081/client", String.class);
    }
	
    @RequestMapping("/client02")
    public String info(){
        return "client02";
    }
    
}

运行

依次启动server、client、client2
打开http://192.168.20.229:8080 点击依赖分析和查找调用链
打开http://192.168.20.229:8081/clientto02 和 http://192.168.20.229:8082/client2to1
再次查看8800的依赖分析和查找调用链，并点击查找调用链中的查找按钮

项目地址：https://github.com/keith002/springcloud-eureka/tree/master/springcloud-sleuth-zipkin