SpringCloud之Sleuth-2.整合sleuth追踪调

我将创建两个module，然后一个调用另一个，然后就可以搭建出环境来，看看链路追踪输出的日志到底长啥样。

maven依赖

摘取部分：

<groupId>com.example</groupId>
    <artifactId>sleuth-traceA</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>sleuth-traceA</name>
    <packaging>jar</packaging>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>2020.0.3</spring-cloud.version>
    </properties>
    <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-sleuth</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</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>

main函数改造

项目A

@EnableDiscoveryClient
@RestController
@Slf4j
@SpringBootApplication
public class SleuthTraceAApplication {


    @LoadBalanced
    @Bean
    public RestTemplate lb(){
        return new RestTemplate();
    }

    @Autowired
    private RestTemplate restTemplate;


    @GetMapping(value = "/traceA")
    private String traceA(){
        log.info("-------Trace A");
        return restTemplate.getForEntity("http://sleuth-traceB/traceB",String.class).getBody();
    }

    public static void main(String[] args) {
        SpringApplication.run(SleuthTraceAApplication.class, args);
    }

}

项目B

@EnableDiscoveryClient
@RestController
@Slf4j
@SpringBootApplication
public class SleuthTraceBApplication {

    @LoadBalanced
    @Bean
    public RestTemplate lb(){
        return new RestTemplate();
    }

    @Autowired
    private RestTemplate restTemplate;

    @GetMapping(value = "/traceB")
    private String traceA(){
        log.info("-------Trace B");
        return "Trace B";
    }


    public static void main(String[] args) {
        SpringApplication.run(SleuthTraceBApplication.class, args);
    }

}

properties配置

A:

server.port= 63001

spring.application.name=sleuth-traceA
eureka.client.service-url.defaultZone = http://localhost:2001/eureka/

logging.file.name=${spring.application.name}.log

info.app.name = sleuth-traceA
info.app.description=test

management.endpoints.web.exposure.include=*
management.endpoint.health.show-details=always

#sleuth config  1就是百分百的记录
spring.sleuth.sampler.probability=1

B:

server.port= 63002

spring.application.name=sleuth-traceB
eureka.client.service-url.defaultZone = http://localhost:2001/eureka/

logging.file.name=${spring.application.name}.log

info.app.name = sleuth-traceB
info.app.description=test

management.endpoints.web.exposure.include=*
management.endpoint.health.show-details=always

#sleuth config  1就是百分百的记录
spring.sleuth.sampler.probability=1

启动项目

首先启动Eureka，然后把两个项目都启动起来，然后首先调用一下项目B的接口，然后再调用一下项目A的接口，可以发现日志：

项目A：

2021-09-17 13:59:38.966  INFO [sleuth-traceA,273cd04e9aa0c900,273cd04e9aa0c900] 13836 --- [io-63001-exec-1] c.e.s.SleuthTraceAApplication            : -------Trace A

项目B:

2021-09-17 13:59:30.682  INFO [sleuth-traceB,5d2a4ae7658d99cf,5d2a4ae7658d99cf] 11736 --- [io-63002-exec-2] c.e.s.SleuthTraceBApplication            : -------Trace B
2021-09-17 13:59:39.115  INFO [sleuth-traceB,273cd04e9aa0c900,d6cc57db7cf1f11b] 11736 --- [io-63002-exec-3] c.e.s.SleuthTraceBApplication            : -------Trace B

我们可以分析一下，项目B第一次我们调用了一下，因为B接口调用完只是自己内部打印了一下日志，并没有跟其他服务有所交互，所以可以看到sleuth打印的两个 字符串都一致，根据之前帖子来看，第一个字符串是 调用链id，第二个是spanid。

而看项目A的打印日志可以看到，第一个是调用链id，然后对应B项目第二回打印的日志的调用链id，都是一样的。

这就很好的模拟了调用链的追踪。