TraceID提高问题排查效率

问题

通常服务遇到问题，通过查询日志信息来定位bug，但是只能根据日志的关键信息来查询，查询信息不全，排查困难

如何解决

将traceID注入日志，查询的时候根据traceID查询出整个链路信息
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上代码

Web接口在拦截器中注入traceID

注意这里是org.apache.logging.log4j.ThreadContext


import cn.hutool.extra.servlet.ServletUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.logging.log4j.ThreadContext;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Component
@Slf4j
public class MyHttpInterceptor extends HandlerInterceptorAdapter {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        log.info("url:{}, params:{}",
                request.getRequestURL(),
                ServletUtil.getParams(request));
        ThreadContext.put("traceId", "我是traceId");
        log.info("注入traceID");
        /*if (request instanceof MyRequest) {
            MyRequest myRequest = (MyRequest) request;
            log.info(myRequest.getBody());
            return super.preHandle(myRequest, response, handler);
        }*/
        return true;
    }
}

RPC接口在RPC过滤器中注入traceID

provider端

rpc添加拦截器


import com.alibaba.dubbo.rpc.*;
import org.apache.logging.log4j.ThreadContext;

public class MyFilter implements Filter {
    @Override
    public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
        ThreadContext.put("traceId", RpcContext.getContext().getAttachment("x_traceId"));
        return invoker.invoke(invocation);
    }
}

配置RPC拦截器
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consumer端

添加拦截器

import com.alibaba.dubbo.rpc.*;
import org.apache.logging.log4j.ThreadContext;

public class MyRpcFilter implements Filter {
    @Override
    public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
        System.out.println("注入RPC");
        RpcContext.getContext().setAttachment("x_token", "我是token");
        String traceId = ThreadContext.get("traceId");
        RpcContext.getContext().setAttachment("x_traceId", traceId);
        return invoker.invoke(invocation);
    }
}

在这里插入图片描述

在log4j2.xml中修改pattern

log4j2依赖

注意要解决冲突

<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-log4j2</artifactId>
		</dependency>

如下在PatternLayout的pattern中加入 %X{traceId}，%X代表获取自定义的参数

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
    <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <PatternLayout pattern="[%d{yyyy-MM-dd HH:mm:ss.SSS}][%t][%highlight{%X{traceId}}][%highlight{%level}][%C:%L] %m%n"/>
        </Console>
        <RollingFile name="RollingFile" fileName="logs/demo-service.log"
                     filePattern="logs/demo-service-%d{yyyy-MM-dd}.log">
            <PatternLayout pattern="[%d{yyyy-MM-dd HH:mm:ss.SSS}][%traceId][%userId][%t][%X{traceId}][%level][%C:%L] %m%n" />
            <Policies>
                <TimeBasedTriggeringPolicy/>
            </Policies>
        </RollingFile>
    </Appenders>
    <Loggers>
        <Root level="INFO">
            <AppenderRef ref="Console"/>
            <AppenderRef ref="RollingFile"/>
        </Root>
    </Loggers>
</Configuration>