OTEL Noop

composer.json

{
    "name": "jonathan/sandbox",
    "require": {
        "slim/slim": "^4.14",
        "slim/psr7": "^1.7",
        "monolog/monolog": "^3.7",
        "open-telemetry/opentelemetry-logger-monolog": "^1.0",
        "open-telemetry/sdk": "^1.1",
        "open-telemetry/exporter-otlp": "^1.1",
        "symfony/http-client": "^7.1",
        "open-telemetry/api": "^1.1",
        "open-telemetry/sem-conv": "^1.27",
        "guzzlehttp/guzzle": "^7.9"
    },
    "autoload": {
        "psr-4": {
            "Jonathan\\Sandbox\\": "src/"
        }
    },
    "authors": [
        {
            "name": "Jonathan Vuillemin",
            "email": "[email protected]"
        }
    ],
    "config": {
        "allow-plugins": {
            "php-http/discovery": true,
            "tbachert/spi": true
        }
    }
}

inde.php

<?php

use OpenTelemetry\API\Trace\Propagation\TraceContextPropagator;
use OpenTelemetry\Contrib\Otlp\SpanExporter;
use OpenTelemetry\SDK\Common\Export\Stream\StreamTransportFactory;
use OpenTelemetry\SDK\Sdk;
use OpenTelemetry\SDK\Trace\NoopTracerProvider;
use OpenTelemetry\SDK\Trace\Sampler\AlwaysOnSampler;
use OpenTelemetry\SDK\Trace\Sampler\ParentBased;
use OpenTelemetry\SDK\Trace\SpanProcessor\SimpleSpanProcessor;
use OpenTelemetry\SDK\Trace\TracerProvider;
use Psr\Http\Message\ResponseInterface as Response;
use Psr\Http\Message\ServerRequestInterface as Request;
use Slim\Factory\AppFactory;

require __DIR__ . '/vendor/autoload.php';


$tracerProvider = TracerProvider::builder()
    ->setSampler(new ParentBased(new AlwaysOnSampler()))
    ->addSpanProcessor(
        new SimpleSpanProcessor(
            new SpanExporter(
                (new StreamTransportFactory())->create('php://stdout', 'application/json')
            )
        )
    )
    ->build();

// uncomment here for noop
//$tracerProvider = new NoopTracerProvider();


$tracer = $tracerProvider->getTracer(
    'demo',
    '0.1.0',
    'https://opentelemetry.io/schemas/1.24.0'
);

Sdk::builder()
    ->setTracerProvider($tracerProvider)
    ->setPropagator(TraceContextPropagator::getInstance())
    ->setAutoShutdown(true)
    ->buildAndRegisterGlobal();


$app = AppFactory::create();

$app->get('/', function (Request $request, Response $response) use ($tracer) {
    $span = $tracer->spanBuilder("example")->startSpan();
    $span->end();

    return $response;
});

$app->run();