81 lines
2.2 KiB
PHP
81 lines
2.2 KiB
PHP
<?php
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use OpenTelemetry\Contrib\Otlp\OtlpHttpTransportFactory;
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use OpenTelemetry\Contrib\Otlp\SpanExporter;
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use OpenTelemetry\SDK\Trace\SpanProcessor\SimpleSpanProcessor;
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use OpenTelemetry\SDK\Trace\TracerProvider;
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use OpenTelemetry\API\Trace\Propagation\TraceContextPropagator;
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use OpenTelemetry\API\Trace\Span;
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use OpenTelemetry\SDK\Trace\SpanExporter\InMemoryExporter;
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class Tracer {
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/** @var Tracer $instance */
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private static $instance;
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private static $tracer;
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public function __construct() {
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$opentelemetry_host = Config::get(Config::OPENTELEMETRY_HOST);
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if ($opentelemetry_host) {
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$transport = (new OtlpHttpTransportFactory())->create("http://$opentelemetry_host/v1/traces", 'application/x-protobuf');
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$exporter = new SpanExporter($transport);
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} else {
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$exporter = new InMemoryExporter();
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}
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$tracerProvider = new TracerProvider(new SimpleSpanProcessor($exporter));
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$this->tracer = $tracerProvider->getTracer('io.opentelemetry.contrib.php');
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$context = TraceContextPropagator::getInstance()->extract(getallheaders());
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$span = $this->tracer->spanBuilder(Config::get(Config::OPENTELEMETRY_SERVICE))
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->setParent($context)
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->startSpan();
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$span->activate();
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register_shutdown_function(function() use ($span, $tracerProvider) {
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$span->end();
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$tracerProvider->shutdown();
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});
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}
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/**
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* @param string $name
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* @param array<string>|array<string, array<string, mixed>> $tags
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* @param array<string> $args
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* @return Span
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*/
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private function _start(string $name, array $tags = [], array $args = []) {
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$span = $this->tracer->spanBuilder($name)->startSpan();
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foreach ($tags as $k => $v) {
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$span->setAttribute($k, $v);
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}
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$span->setAttribute("func.args", json_encode($args));
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$span->activate();
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return $span;
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}
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/**
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* @param string $name
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* @param array<string>|array<string, array<string, mixed>> $tags
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* @param array<string> $args
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* @return Span
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*/
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public static function start(string $name, array $tags = [], array $args = []) {
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return self::get_instance()->_start($name, $tags, $args);
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}
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public static function get_instance() : Tracer {
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if (self::$instance == null)
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self::$instance = new self();
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return self::$instance;
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}
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}
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