本示例演示如何在集成了 SOFATracer 的应用,通过配置 HttpClient 的使用方式将链路数据记录在文件中。
要使用 SOFABoot,需要先准备好基础环境,SOFABoot 依赖以下环境:
- JDK8
- 需要采用 Apache Maven 3.2.5 或者以上的版本来编译
在创建好一个 Spring Boot 的工程之后,接下来就需要引入 SOFABoot 的依赖,首先,需要将上文中生成的 Spring Boot 工程的 zip
包解压后,修改 Maven 项目的配置文件 pom.xml
,将
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>${spring.boot.version}</version>
<relativePath/>
</parent>
替换为:
<parent>
<groupId>com.alipay.sofa</groupId>
<artifactId>sofaboot-dependencies</artifactId>
<version>${sofa.boot.version}</version>
</parent>
这里的 ${sofa.boot.version} 指定具体的 SOFABoot 版本,参考发布历史。
然后,在工程中添加 SOFATracer 依赖:
<dependency>
<groupId>com.alipay.sofa</groupId>
<artifactId>tracer-sofa-boot-starter</artifactId>
</dependency>
最后,在工程的 application.properties
文件下添加一个 SOFATracer 要使用的参数,包括spring.application.name
用于标示当前应用的名称;logging.path
用于指定日志的输出目录。
# Application Name
spring.application.name=HttpClientDemo
# logging path
logging.path=./logs
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.alipay.sofa</groupId>
<artifactId>tracer-sofa-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>com.alipay.sofa</groupId>
<artifactId>sofa-tracer-httpclient-plugin</artifactId>
</dependency>
<!-- HttpClient Dependency -->
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<!-- 版本 4.5.X 系列 -->
<version>4.5.3</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpasyncclient</artifactId>
<!-- 版本 4.5.X 系列 -->
<version>4.1.3</version>
</dependency>
@RestController
public class SampleRestController {
private final AtomicLong counter = new AtomicLong(0);
/**
* Request http://localhost:8080/httpclient?name=
* @param name name
* @return Map of Result
*/
@RequestMapping("/httpclient")
public Map<String, Object> greeting(@RequestParam(value = "name", defaultValue = "httpclient") String name) {
Map<String, Object> map = new HashMap<String, Object>();
map.put("count", counter.incrementAndGet());
map.put("name", name);
return map;
}
}
构造 HttpClient 的过程不详细展开,具体可以参见本示例中 HttpClientInstance
(同步) 和 HttpAsyncClientInstance
(异步)构造方法,仅供参考,其中需要重点强调的是,
为了能够使得 HttpClient 这个第三方开源组件能够支持 SOFATracer 的链路调用,SOFATracer 提供了 HttpClient 的插件扩展即 sofa-tracer-httpclient-plugin ,为了使得用 SOFATracer 的 HttpCliet 正确的埋点,我们需要使用 HttpClientBuilder 去构造 HttpClient 的实例,
并需要显示的调用 SofaTracerHttpClientBuilder.clientBuilder(httpClientBuilder) 来构造出一个经过 SOFATracer 埋点的 HttpClientBuilder ,关键代码示例如下
- 构造 HttpClient 同步调用实例:
HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
//SOFATracer
SofaTracerHttpClientBuilder.clientBuilder(httpClientBuilder);
CloseableHttpClient httpClient = httpClientBuilder.setConnectionManager(connManager).disableAutomaticRetries()
.build();
- 构造 HttpClient 异步调用实例:
RequestConfig requestConfig = RequestConfig.custom().setSocketTimeout(6000).setConnectTimeout(6000).setConnectionRequestTimeout(6000).build();
HttpAsyncClientBuilder httpAsyncClientBuilder = HttpAsyncClientBuilder.create();
//tracer
SofaTracerHttpClientBuilder.asyncClientBuilder(httpAsyncClientBuilder);
CloseableHttpAsyncClient asyncHttpclient = httpAsyncClientBuilder.setDefaultRequestConfig(requestConfig).build();
通过 SofaTracerHttpClientBuilder(clientBuilder 方法构造同步,asyncClientBuilder 方法构造异步) 构造的 HttpClient 在发起对上文的 RESTful 服务调用的时候,就会埋点 SOFATracer 的链路的数据。
可以将工程导入到 IDE 中运行工程里面中的 main
方法(本实例 main 方法在 HttpClientDemoApplication 中)启动应用,在控制台中看到启动打印的日志如下:
2018-09-27 20:31:21.465 INFO 33277 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2018-09-27 20:31:21.599 INFO 33277 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2018-09-27 20:31:21.608 INFO 33277 --- [ main] c.a.s.t.e.h.HttpClientDemoApplication : Started HttpClientDemoApplication in 5.949 seconds (JVM running for 6.573)
当有类似如下的日志时,说明 HttpClient 的调用成功:
2018-09-27 20:31:22.336 INFO 33277 --- [ main] c.a.s.t.e.h.HttpClientDemoApplication : Response is {"count":1,"name":"httpclient"}
2018-09-27 20:31:22.453 INFO 33277 --- [ main] c.a.s.t.e.h.HttpClientDemoApplication : Async Response is {"count":2,"name":"httpclient"}
在上面的 application.properties
里面,我们配置的日志打印目录是 ./logs
即当前应用的根目录(我们可以根据自己的实践需要进行配置),在当前工程的根目录下可以看到类似如下结构的日志文件:
./logs
├── spring.log
└── tracelog
├── httpclient-digest.log
├── httpclient-stat.log
├── spring-mvc-digest.log
├── spring-mvc-stat.log
├── static-info.log
└── tracer-self.log
示例中通过构造两个 HttpClient(一个同步一个异步) 发起对同一个 RESTful 服务的调用,调用完成后可以在 httpclient-digest.log 中看到类似如下的日志,而对于每一个输出字段的含义可以看 SOFATracer 的说明文档:
{"time":"2018-09-27 20:31:22.328","local.app":"HttpClientDemo","traceId":"0a0fe8801538051482054100133277","spanId":"0","request.url":"http://localhost:8080/httpclient","method":"GET","result.code":"200","req.size.bytes":0,"resp.size.bytes":-1,"time.cost.milliseconds":274,"current.thread.name":"main","remote.app":"","baggage":""}
{"time":"2018-09-27 20:31:22.443","local.app":"HttpClientDemo","traceId":"0a0fe8801538051482410100233277","spanId":"0","request.url":"http://localhost:8080/httpclient","method":"GET","result.code":"200","req.size.bytes":0,"resp.size.bytes":-1,"time.cost.milliseconds":33,"current.thread.name":"I/O dispatcher 1","remote.app":"","baggage":""}