101 lines
2.9 KiB
PHP
101 lines
2.9 KiB
PHP
<?php
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use OpenTelemetry\API\Trace\Propagation\TraceContextPropagator;
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use OpenTelemetry\API\Trace\SpanKind;
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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\Common\Attribute\Attributes;
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use OpenTelemetry\SDK\Resource\ResourceInfo;
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use OpenTelemetry\SDK\Resource\ResourceInfoFactory;
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use OpenTelemetry\SDK\Trace\Sampler\AlwaysOnSampler;
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use OpenTelemetry\SDK\Trace\Sampler\ParentBased;
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use OpenTelemetry\SDK\Trace\SpanExporter\InMemoryExporter;
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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\SemConv\ResourceAttributes;
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class Tracer {
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/** @var Tracer $instance */
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private static $instance;
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/** @var OpenTelemetry\SDK\Trace\TracerProviderInterface $tracerProvider */
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private $tracerProvider;
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/** @var OpenTelemetry\API\Trace\TracerInterface $tracer */
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private $tracer;
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public function __construct() {
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$OPENTELEMETRY_ENDPOINT = Config::get(Config::OPENTELEMETRY_ENDPOINT);
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if ($OPENTELEMETRY_ENDPOINT) {
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$transport = (new OtlpHttpTransportFactory())->create($OPENTELEMETRY_ENDPOINT, 'application/x-protobuf');
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$exporter = new SpanExporter($transport);
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} else {
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$exporter = new InMemoryExporter();
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}
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$resource = ResourceInfoFactory::emptyResource()->merge(
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ResourceInfo::create(Attributes::create(
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[ResourceAttributes::SERVICE_NAME => Config::get(Config::OPENTELEMETRY_SERVICE)]
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), ResourceAttributes::SCHEMA_URL),
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);
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$this->tracerProvider = TracerProvider::builder()
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->addSpanProcessor(new SimpleSpanProcessor($exporter))
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->setResource($resource)
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->setSampler(new ParentBased(new AlwaysOnSampler()))
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->build();
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$this->tracer = $this->tracerProvider->getTracer('io.opentelemetry.contrib.php');
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$context = TraceContextPropagator::getInstance()->extract(getallheaders());
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$span = $this->tracer->spanBuilder($_SESSION['name'] ?? 'not logged in')
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->setParent($context)
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->setSpanKind(SpanKind::KIND_SERVER)
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->setAttribute('php.request', json_encode($_REQUEST))
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->setAttribute('php.server', json_encode($_SERVER))
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->setAttribute('php.session', json_encode($_SESSION ?? []))
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->startSpan();
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$scope = $span->activate();
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register_shutdown_function(function() use ($span, $scope) {
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$span->end();
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$scope->detach();
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$this->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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* @return OpenTelemetry\API\Trace\SpanInterface
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*/
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private function _start(string $name) {
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$span = $this->tracer
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->spanBuilder($name)
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->setSpanKind(SpanKind::KIND_SERVER)
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->startSpan();
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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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* @return OpenTelemetry\API\Trace\SpanInterface
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*/
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public static function start(string $name) {
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return self::get_instance()->_start($name);
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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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