诚之和:基于Spring Boot + Dubbo的全链路日志追踪是怎样的

基于Spring Boot + Dubbo的全链路日志追踪是怎样的,针对这个问题,这篇文章详细介绍了相对应的分析和解答,希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。

一、概要

完成分析之后,就要具体的实现了。

service-a: 实现dubbo服务。

service-b: 实现web服务,并调用service-a实现的服务。

二、实现

2.1 日志采集及存储

本例直接使用【阿里云·日志服务】进行数据存储和检索,使用Aliyun Log Logback Appender进行日志收集及上传。

其实就是阿里自己实现了一个Logback Appender。当然我们也可以自己实现,比如上传至自建的ELK中。

2.2 项目中traceId生成、传递、销毁

2.2.1 traceId生成、销毁

2.2.1.1 客户端请求等触发(外部)

外部类请求触发情况,使用拦截器处理。

请求过来之后,生成traceId,并写入org.slf4j.MDC

请求完成之后,将traceIdorg.slf4j.MDC中移除。

package com.example.dubboserviceb.interceptor;import com.example.dubboserviceb.constants.Constants;import org.slf4j.MDC;import org.springframework.web.servlet.HandlerInterceptor;import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.util.UUID;/**
 * @author lpe234
 * @since 2019/5/25 14:43
 */public class TraceIdInterceptor implements HandlerInterceptor {

    @Override    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        // generate traceId        String traceId = UUID.randomUUID().toString().replace("-", "");

        // put traceId        MDC.put(Constants.TRACE_ID, traceId);

        return true;
    }

    @Override    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

        // clear traceId        MDC.remove(Constants.TRACE_ID);
    }
}
2.2.1.2 定时任务等触发(内部)

(略...)

2.2.1 traceId传递

2.2.1.1 WEB类传递

简单的接口返回类,增加traceId字段。

package com.example.dubboserviceb.utils;import lombok.Data;/**
 * @author lpe234
 * @since 2019/5/25 14:55
 */@Datapublic class RestResponse<T> {
    private Integer code;
    private String msg;
    private T data;
    private String traceId;

    public RestResponse() {
    }

    public RestResponse(Integer code, String msg, T data) {
        this.code = code;
        this.msg = msg;
        this.data = data;
    }

    public static <T> RestResponse<T> ok(T data) {
        return new RestResponse<>(200, "ok", data);
    }

    public static <T> RestResponse<T> error(T data) {
        return new RestResponse<>(400, "error", data);
    }
}

当请求响应结果生成前,获取当前org.slf4j.MDC中的traceId,设置到RestResponse中。

package com.example.dubboserviceb.advice;import com.example.dubboserviceb.constants.Constants;import com.example.dubboserviceb.utils.RestResponse;import org.slf4j.MDC;import org.springframework.core.MethodParameter;import org.springframework.http.MediaType;import org.springframework.http.converter.HttpMessageConverter;import org.springframework.http.server.ServerHttpRequest;import org.springframework.http.server.ServerHttpResponse;import org.springframework.web.bind.annotation.ControllerAdvice;import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;/**
 * @author lpe234
 * @since 2019/5/25 15:03
 */@ControllerAdvicepublic class ResponseModifyAdvice implements ResponseBodyAdvice<Object> {

    @Override    public boolean supports(MethodParameter methodParameter, Class<? extends HttpMessageConverter<?>> aClass) {
        return true;
    }

    @Override    public Object beforeBodyWrite(Object o, MethodParameter methodParameter, MediaType mediaType, Class<? extends HttpMessageConverter<?>> aClass, ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse) {

        // put traceId to response        ((RestResponse) o).setTraceId(MDC.get(Constants.TRACE_ID));

        return o;
    }
}

最终,接口响应数据例如如下:

{
  "code": 200,
  "msg": "ok",
  "data": "Hello apple",
  "traceId": "6c25de3422374d51be58555ae9c380e8"}
2.2.1.2 Dubbo类传递

traceId的存储使用org.apache.dubbo.rpc.RpcContext(内部使用InternalThreadLocal实现)。

借助Dubbo的过滤器来实现,traceId在Dubbo服务间的读取、写入和清除。

package com.example.dubboservicea.filter;import com.example.dubboservicea.constants.Constants;import org.apache.dubbo.common.extension.Activate;import org.apache.dubbo.rpc.*;import org.slf4j.MDC;/**
 * @author lpe234
 * @since 2019/5/25 15:24
 */@Activate(group = {org.apache.dubbo.common.Constants.PROVIDER, org.apache.dubbo.common.Constants.CONSUMER})public class DubboTraceIdFilter implements Filter {

    @Override    public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {

        RpcContext rpcContext = RpcContext.getContext();

        // before        if (rpcContext.isProviderSide()) {
            // get traceId from dubbo consumer,and set traceId to MDC            String traceId = rpcContext.getAttachment(Constants.TRACE_ID);
            MDC.put(Constants.TRACE_ID, traceId);
        }

        if (rpcContext.isConsumerSide()) {
            // get traceId from MDC, and set traceId to rpcContext            String traceId = MDC.get(Constants.TRACE_ID);
            rpcContext.setAttachment(Constants.TRACE_ID, traceId);
        }

        Result result = invoker.invoke(invocation);

        // after        if (rpcContext.isProviderSide()) {
            // clear traceId from MDC            MDC.remove(Constants.TRACE_ID);
        }

        return result;
    }

    @Override    public Result onResponse(Result result, Invoker<?> invoker, Invocation invocation) {
        return result;
    }
}

另,需要在resources/META-INF/dubbo/文件夹下,创建com.alibaba.dubbo.rpc.Filter文本文件。内容为dubboTraceIdFilter=com.example.dubboservicea.filter.DubboTraceIdFilter

而后,spring-boot配置文件中 配置dubbo的过滤器

#dubbodubbo:  scan:    base-packages: com.example.dubboservicea.provider, com.example.dubboservicea.reference  protocol:    name: dubbo    port: 12101  registry:    address: zookeeper://192.168.0.150:20001  provider:    filter: dubboTraceIdFilter  consumer:    filter: dubboTraceIdFilter

三、结果

3.1 HTTP请求结果返回

3.2 日志服务查询

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