如何在PHP微服务中实现分布式日志追踪功能

composer require openzipkin/zipkin

<?php

use ZipkinInstrumentationHttpClientPsr18Client;
use ZipkinInstrumentationHttpClientPsr18HttpMiddleware;
use ZipkinSamplerBinarySampler;
use ZipkinSpan;
use ZipkinTimestamp;
use ZipkinTracingBuilder;
use ZipkinOpenTracingSpanContext;
use ZipkinOpenTracingTracer;


// 初始化Zipkin追踪器
$tracing = TracingBuilder::create()
    ->havingLocalEndpoint('your_service_name') // 这里填写当前服务的名称
    ->havingSampler(BinarySampler::createAsAlwaysSample())
    ->build();

// 创建一个Zipkin追踪器，用于记录追踪信息
$tracer = new Tracer($tracing);

// 定义一个中间件，用于追踪请求
$middleware = new Psr18HttpMiddleware($tracer);

// 创建一个HTTP客户端，使用Zipkin中间件处理请求
$client = new Psr18Client($middleware);

// 发送HTTP请求
$request = new GuzzleHttpPsr7Request('GET', 'http://example.com');
$response = $client->sendRequest($request);

// 创建一个Zipkin span，记录该请求的追踪信息
$span = $tracer->startActiveSpan('my_span');
$spanContext = new SpanContext($tracer->getTracer(), $span->getContext());

// 添加追踪信息到请求头
$request = $request->withHeader('X-B3-TraceId', $spanContext->getTraceId());
$request = $request->withHeader('X-B3-SpanId', $spanContext->getSpanId());
$request = $request->withHeader('X-B3-ParentSpanId', $spanContext->getParentId());
$request = $request->withHeader('X-B3-Sampled', $spanContext->isSampled() ? '1' : '0');
$request = $request->withHeader('X-B3-Flags', $spanContext->getFlags());

// 发送带有追踪信息的HTTP请求
$response = $client->sendRequest($request);

// 结束span
$span->addEvent($timestamp, 'sent');

// 输出收到的响应
echo $response->getBody();

// 关闭Zipkin追踪器
$tracing->close();