日志追踪：log增加traceId

开发中经常需要根据日志排查问题或跟踪调用流程，很多业务日志并没有考虑排查问题时的便利性，看似都记录了日志，但同一个请求链路的日志无法对应，特别是当日志跨服务时候，或者同一个业务逻辑同一时刻有多条日志，根本无法对应起来，如果日志记可以追踪的话，可以根据全局唯一id搜索得出一条调用链的日志，顺着这个日志链条就可以看出程序的执行全过程，进而有利于排查出问题。

这里我们用两种方式实现：

自己写代码实现：轻量级，灵活，可任意修改，适合小项目;目前已实现支持已spring为基础的springboot,springcloud,dubbo且使用logback日志框架的项目。
使用开源工具：安装费点事，功能强大，适合大项目；支持的开发语言和框架较多。

1. 代码实现

不想一步步的自己实现的话，有已经封装好的jar(建议www.search.maven.org搜最新版本)：


    com.wuyunonline.tracelog
    tracelog-spring-boot-starter
    1.0.0

使用说明和源码地址：https://gitee.com/jwb-wuyun/t...

下面是自己实现的步骤

1.1 springmvc

先写一个拦截器：

import com.tracelog.common.constant.TraceLogConstant;
import com.tracelog.common.util.TraceIdUtil;
import org.slf4j.MDC;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class TraceLogWebMvcInterceptor extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
        String method = request.getMethod();
        // 放行跨域预请求
        if (method.equals("OPTIONS")) {
            return true;
        }
        String traceId = request.getHeader(TraceLogConstant.TRACE_ID);
        if (StringUtils.isEmpty(traceId)) {
            traceId = TraceIdUtil.uuid_timestamp();
        }
        MDC.put(TraceLogConstant.TRACE_ID, traceId);
        return true;
    }
}

再配置拦截器：

import com.tracelog.interceptor.TraceLogWebMvcInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class TraceLogWebMvcConfig implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(mvcInterceptor()).addPathPatterns("/**");
    }

    @Bean
    public TraceLogWebMvcInterceptor mvcInterceptor() {
        return new TraceLogWebMvcInterceptor();
    }

}

1.2 springcloud

springcloud一般都是用feign，所以我们需要拦截feign。
先写拦截器：

import com.tracelog.common.constant.TraceLogConstant;
import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.slf4j.MDC;

public class TraceLogFeignInterceptor implements RequestInterceptor {

    @Override
    public void apply(RequestTemplate requestTemplate) {
        requestTemplate.header(TraceLogConstant.TRACE_ID, MDC.get(TraceLogConstant.TRACE_ID));

    }
}

再配置拦截器：

import com.tracelog.interceptor.TraceLogFeignInterceptor;
import feign.RequestInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class TraceLogFeignConfig {

    @Bean
    public RequestInterceptor requestInterceptor() {
        return new TraceLogFeignInterceptor();
    }
}

1.3 dubbo

dubbo必须是Apache的dubbo（老版的是阿里的，阿里已将dubbo加入apache）
先写过滤器：

import com.tracelog.common.constant.TraceLogConstant;
import com.tracelog.common.util.TraceIdUtil;
import org.apache.dubbo.common.constants.CommonConstants;
import org.apache.dubbo.common.extension.Activate;
import org.apache.dubbo.rpc.*;
import org.slf4j.MDC;
import org.springframework.util.StringUtils;

@Activate(group = {CommonConstants.PROVIDER, CommonConstants.CONSUMER})
public class TraceLogDubboFilter implements Filter {

    @Override
    public Result invoke(Invoker invoker, Invocation invocation) throws RpcException {
        // 获取dubbo上下文中的traceId
        String traceId = invocation.getAttachment(TraceLogConstant.TRACE_ID);
        if (StringUtils.isEmpty(traceId)) {
            // customer 获取上游来的traceId，并设置到dubbo的上下文，如果没有则生成一个
            traceId = MDC.get(TraceLogConstant.TRACE_ID);
            if (StringUtils.isEmpty(traceId)) {
                traceId = TraceIdUtil.uuid_timestamp();
                MDC.put(TraceLogConstant.TRACE_ID, traceId);
            }
            // provider 设置traceId到日志到上下文
            invocation.setAttachment(TraceLogConstant.TRACE_ID, traceId);
        } else {
            MDC.put(TraceLogConstant.TRACE_ID, traceId);
        }
        Result result = invoker.invoke(invocation);
        return result;
    }
}

声明过滤器：
在resource下创建Filter文件，里面内容：traceLogDubboFilter=.TraceLogDubboFilter，是你的实际路径，如下图：

1.4 注解

比如定时任务等利用AOP加切面：@Scheduled,@PostConstruct

import com.tracelog.common.constant.TraceLogConstant;
import com.tracelog.common.util.TraceIdUtil;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.slf4j.MDC;
import org.springframework.stereotype.Component;

@Aspect
@Component
public class TracelogAspect {

    @Pointcut("@annotation(org.springframework.scheduling.annotation.Scheduled) || @annotation(javax.annotation.PostConstruct)")
    public void tracelogPointCut() {
    }

    @Around("tracelogPointCut()")
    public Object around(ProceedingJoinPoint point) throws Throwable {
        MDC.put(TraceLogConstant.TRACE_ID, TraceIdUtil.uuid_timestamp());
        return point.proceed();
    }

}

1.5 异步线程获取主线程traceId

针对注解@Async，需要重他的写线程池，其他线程的处理可以参考这种方式。
先实现修饰类：

import org.slf4j.MDC;
import org.springframework.core.task.TaskDecorator;

import java.util.Map;

public class TraceLogMdcTaskDecorator implements TaskDecorator {

    @Override
    public Runnable decorate(Runnable runnable) {
        Map map = MDC.getCopyOfContextMap();
        return () -> {
            try {
                if (map != null) {
                    MDC.setContextMap(map);
                }
                runnable.run();
            } finally {
                MDC.clear();
            }
        };
    }
}

再配置：

import com.tracelog.interceptor.TraceLogMdcTaskDecorator;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.AsyncConfigurerSupport;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;

@Configuration
public class TraceLogAsyncConfig extends AsyncConfigurerSupport {

    @Override
    public Executor getAsyncExecutor() {
        ThreadPoolTaskExecutor threadPoolTaskExecutor = new ThreadPoolTaskExecutor();
        threadPoolTaskExecutor.setCorePoolSize(50);
        threadPoolTaskExecutor.setMaxPoolSize(100);
        threadPoolTaskExecutor.setQueueCapacity(1000);
        threadPoolTaskExecutor.setThreadNamePrefix("Async-");
        threadPoolTaskExecutor.setTaskDecorator(new TraceLogMdcTaskDecorator());
        threadPoolTaskExecutor.initialize();
        return threadPoolTaskExecutor;
    }

}

1.6 扩展支持httpclinet，okhttp

使用Okhttp或HttpClient调用时候如果想传递traceId，必须在自己的Okhttp或HttpClient中加入traclog 拦截器，如下：
Okhttp
实现拦截器：

import com.tracelog.common.constant.TraceLogConstant;
import okhttp3.Interceptor;
import okhttp3.Request;
import okhttp3.Response;
import org.jetbrains.annotations.NotNull;
import org.slf4j.MDC;

import java.io.IOException;

public class TraceLogOkhttpInterceptor implements Interceptor {

    @Override
    public Response intercept(@NotNull Chain chain) throws IOException {
        Request request = chain.request().newBuilder()
                .addHeader(TraceLogConstant.TRACE_ID, MDC.get(TraceLogConstant.TRACE_ID))
                .build();
        return chain.proceed(request);
    }
}

使用拦截器

import com.tracelog.interceptor.TraceLogOkhttpInterceptor;
...
OkHttpClient okHttpClient = new OkHttpClient.Builder().addInterceptor(new TraceLogOkhttpInterceptor()).build();

HttpClient
实现拦截器：

import com.tracelog.common.constant.TraceLogConstant;
import org.apache.http.HttpRequest;
import org.apache.http.HttpRequestInterceptor;
import org.apache.http.protocol.HttpContext;
import org.slf4j.MDC;

public class TraceLogHttpClientInterceptor implements HttpRequestInterceptor {

    @Override
    public void process(HttpRequest httpRequest, HttpContext httpContext){
        httpRequest.addHeader(TraceLogConstant.TRACE_ID, MDC.get(TraceLogConstant.TRACE_ID));
    }
}

使用拦截器

import com.tracelog.interceptor.TraceLogHttpClientInterceptor;
...
CloseableHttpClient httpClient = HttpClientBuilder.create().addInterceptorFirst(new TraceLogHttpClientInterceptor()).build();

1.7 配置logback.xml

项目中找到logback.xml或logback-spring.xml，在日志格式中加入[traceId:%X{traceId}] 例如：

启动项目，查看效果，类似下图说明成功。

2. 采用第三方工具

2.1 配置pom.xml



    org.apache.skywalking
    apm-toolkit-trace
    8.9.0


    org.apache.skywalking
    apm-toolkit-logback-1.x
    8.9.0

2.2 配置logback.xml

    
    

    
    
        ${log.path}/info.log
        
            
                ${log.pattern}
            
            ${log.pattern}
        
    


    
        
            
                ${log.pattern}