SpringCloudGateway使用Skywalking时日志打印traceId-Toy模板网

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前置信息

Skywalking oap 与 agent部署
https://blog.csdn.net/kismet2399/article/details/131560171

环境配置

spring-cloud-starter-gateway:3.1.4
Skywalking Agent:8.14.0

背景

SpringCloudGateway集成Skywalking后无法打印traceId

解决方式

目前没有找到logback的解决方式，所以日志打印改用log4j2

mvn添加配置

   <dependency>
            <groupId>org.apache.skywalking</groupId>
            <artifactId>apm-toolkit-log4j-2.x</artifactId>
            <version>8.14.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.skywalking</groupId>
            <artifactId>apm-toolkit-trace</artifactId>
            <version>8.14.0</version>
        </dependency>
          <!--解决log4j2依赖问题-->
         <dependency>
            <groupId>com.lmax</groupId>
            <artifactId>disruptor</artifactId>
            <version>3.4.4</version>
        </dependency>

让日志获取到traceId

import org.springframework.stereotype.Component;
import reactor.core.publisher.Hooks;
import reactor.core.publisher.Operators;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

/**
 * @author kismet
 */
@Component
public class LogHooks {

    private static final String KEY = "logMdc";

    @PostConstruct
    public void setHook() {
        Hooks.onEachOperator(KEY,
                Operators.lift((scannable, coreSubscriber) -> new MdcSubscriber(coreSubscriber)));
    }

    @PreDestroy
    public void resetHook() {
        Hooks.resetOnEachOperator(KEY);
    }

}


import com.alibaba.fastjson.JSON;
import com.alibaba.nacos.common.utils.JacksonUtils;
import org.jboss.logging.MDC;
import org.reactivestreams.Subscription;
import reactor.core.CoreSubscriber;
import reactor.util.context.Context;

import java.lang.reflect.Field;
import java.util.Optional;

/**
 * @author zuozhuan
 */
public class MdcSubscriber implements CoreSubscriber {

    private static final String TRACE_ID = "traceId";

    private static final String SKYWALKING_CTX_SNAPSHOT = "SKYWALKING_CONTEXT_SNAPSHOT";

    private final CoreSubscriber<Object> actual;

    public MdcSubscriber(CoreSubscriber<Object> actual) {
        this.actual = actual;
    }

    @Override
    public void onSubscribe(Subscription s) {
        actual.onSubscribe(s);
    }

    @Override
    public void onNext(Object o) {
        Context c = actual.currentContext();
        Optional<String> traceIdOptional = Optional.empty();
        if (!c.isEmpty() && c.hasKey(SKYWALKING_CTX_SNAPSHOT)) {
            Object object = c.get(SKYWALKING_CTX_SNAPSHOT);
            Object traceId = findField(object, "traceId");
            String ids = JacksonUtils.toJson(traceId);
            traceIdOptional = Optional.ofNullable(ids)
                    .map(JSON::parseObject)
                    .map(t -> t.get("id"))
                    .map(Object::toString);
        }

        MDC.put(TRACE_ID, traceIdOptional.orElse("N/A"));
        actual.onNext(o);
    }

    private static Object findField(Object object, String field) {
        if (object == null) {
            return null;
        }
        try {
            Class<?> aClass = object.getClass();

            Field mValuesField = null;
            mValuesField = aClass.getDeclaredField(field);
            // 3、打开访问权限
            mValuesField.setAccessible(true);
            // 4、获取 memberValuesMap
            return mValuesField.get(object);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public void onError(Throwable throwable) {
        actual.onError(throwable);
    }

    @Override
    public void onComplete() {
        actual.onComplete();
    }

    @Override
    public Context currentContext() {
        return actual.currentContext();
    }

插件添加
将skywalking-agent下optional-plugins中的apm-spring-cloud-gateway-3.x-plugin-8.14.0.jar和apm-spring-webflux-5.x-plugin-8.14.0.jar移动到plugins下
log4j2.xml配置示例

<?xml version="1.0" encoding="UTF-8"?>
<Configuration>
    <Properties>
        <Property name="PATTERN" value="%d{yyyy-MM-dd HH:mm:ss.SSS} [TID:%equals{%X{traceId}}{}{N/A}] [%thread] %-5level %logger{20}  %msg%n"/>
    </Properties>
    <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <PatternLayout pattern="${PATTERN}"/>
        </Console>
        <Async name="Async">
            <AppenderRef ref="Console"/>
        </Async>
        <!--输出到日志文件，滚动分割日志文件，自动打包gz -->
        <RollingFile name="INFO_FILE" fileName="${env:HOME}/logs/gateway/gateway.log" filePattern="${env:HOME}/logs/gateway/gateway-%d{yyyyMMdd}.log.%i">
            <PatternLayout pattern="${PATTERN}"/>
            <Policies>
                <!--默认一天一个文件 -->
                <TimeBasedTriggeringPolicy />
                <!--一天内大于size就单独分隔-->
                <SizeBasedTriggeringPolicy size="500MB"/>
            </Policies>
        </RollingFile>
        <!--skywalking 日志收集 -->
        <GRPCLogClientAppender name="APM_LOG">
            <PatternLayout pattern="${PATTERN}"/>
        </GRPCLogClientAppender>
    </Appenders>

    <Loggers>
        <Root level="INFO">
            <AppenderRef ref="Console">
                <Filters>
                    <PropertyFilter key="spring.profiles.active" value="dev" onMatch="ACCEPT" onMismatch="DENY" />
                </Filters>
            </AppenderRef>
            <AppenderRef ref="INFO_FILE"/>
            <AppenderRef ref="APM_LOG"/>
        </Root>
    </Loggers>
</Configuration>

如果使用skywalking 日志收集启动参数需添加启动参数

-Dlog4j2.contextSelector=org.apache.logging.log4j.core.async.AsyncLoggerContextSelector

参考链接：
https://www.jianshu.com/p/40727a0b9604
https://skywalking.apache.org/docs/skywalking-java/v8.14.0/en/setup/service-agent/java-agent/application-toolkit-log4j-2.x/文章来源地址https://www.toymoban.com/news/detail-544509.html

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