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在 PHP 中,RPC(遠程過程調(diào)用)框架通常用于在分布式系統(tǒng)中實現(xiàn)服務(wù)之間的通信。為了實現(xiàn)調(diào)用鏈追蹤,我們需要在請求發(fā)起時生成一個唯一的標識符(例如 trace_id),并將其傳遞給被調(diào)用的服務(wù)。這樣,我們可以通過 trace_id 跟蹤整個調(diào)用鏈。
以下是一個簡單的 PHP RPC 框架調(diào)用鏈追蹤實現(xiàn):
composer require jonahgeorge/zipkin-php
class TraceIdGenerator
{
public static function generateTraceId()
{
return bin2hex(random_bytes(8)) . '-' . bin2hex(random_bytes(4)) . '-' . bin2hex(random_bytes(4));
}
public static function generateSpanId()
{
return bin2hex(random_bytes(8));
}
}
class ZipkinTracer
{
private $tracer;
public function __construct($serviceName)
{
$endpoint = Endpoint::create($serviceName, '127.0.0.1', 80);
$reporter = new HttpReporter('http://localhost:9411/api/v2/spans');
$sampler = BinarySampler::createAsAlwaysSample();
$this->tracer = TracingBuilder::create()->havingLocalEndpoint($endpoint)->havingReporter($reporter)->havingSampler($sampler)->build()->getTracer();
}
public function startSpan($name, $traceId = null, $parentSpanId = null)
{
if ($traceId === null) {
$traceId = TraceIdGenerator::generateTraceId();
}
$spanId = TraceIdGenerator::generateSpanId();
$context = TraceContext::create($traceId, $spanId, $parentSpanId);
$span = $this->tracer->newChild($context);
$span->start();
$span->setName($name);
return $span;
}
public function finishSpan($span)
{
$span->finish();
$this->tracer->flush();
}
}
客戶端:
$zipkinTracer = new ZipkinTracer('client');
$span = $zipkinTracer->startSpan('call_service');
// 調(diào)用 RPC 服務(wù)
$result = callRpcService();
$zipkinTracer->finishSpan($span);
服務(wù)端:
$zipkinTracer = new ZipkinTracer('server');
$span = $zipkinTracer->startSpan('handle_request', $_SERVER['HTTP_X_B3_TRACEID'], $_SERVER['HTTP_X_B3_SPANID']);
// 處理請求
$response = handleRequest();
$zipkinTracer->finishSpan($span);
這樣,我們就實現(xiàn)了一個簡單的 PHP RPC 框架的調(diào)用鏈追蹤。你可以根據(jù)自己的需求對其進行擴展和優(yōu)化。
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