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<?php
use OpenTelemetry\API\Trace\Propagation\TraceContextPropagator;
use OpenTelemetry\API\Trace\SpanContextInterface;
use OpenTelemetry\API\Trace\SpanInterface;
use OpenTelemetry\API\Trace\SpanKind;
use OpenTelemetry\API\Trace\TraceFlags;
use OpenTelemetry\API\Trace\TraceStateInterface;
use OpenTelemetry\Context\ContextInterface;
use OpenTelemetry\Context\ContextKey;
use OpenTelemetry\Context\ContextKeyInterface;
use OpenTelemetry\Context\ImplicitContextKeyedInterface;
use OpenTelemetry\Context\ScopeInterface;
use OpenTelemetry\Contrib\Otlp\OtlpHttpTransportFactory;
use OpenTelemetry\Contrib\Otlp\SpanExporter;
use OpenTelemetry\SDK\Common\Attribute\Attributes;
use OpenTelemetry\SDK\Resource\ResourceInfo;
use OpenTelemetry\SDK\Resource\ResourceInfoFactory;
use OpenTelemetry\SDK\Trace\Sampler\AlwaysOnSampler;
use OpenTelemetry\SDK\Trace\Sampler\ParentBased;
use OpenTelemetry\SDK\Trace\SpanProcessor\SimpleSpanProcessor;
use OpenTelemetry\SDK\Trace\TracerProvider;
use OpenTelemetry\SemConv\ResourceAttributes;
class DummyContextInterface implements ContextInterface {
/** @var DummyContextInterface */
private static $instance;
public function __construct() {
self::$instance = $this;
}
/** @phpstan-ignore-next-line */
public static function createKey(string $key): ContextKeyInterface { return new ContextKey(); }
public static function getCurrent(): ContextInterface { return self::$instance; }
public function activate(): ScopeInterface { return new DummyScopeInterface(); }
public function with(ContextKeyInterface $key, $value): ContextInterface { return $this; }
public function withContextValue(ImplicitContextKeyedInterface $value): ContextInterface { return $this; }
public function get(ContextKeyInterface $key) { return new ContextKey(); }
}
class DummySpanContextInterface implements SpanContextInterface {
/** @var DummySpanContextInterface $instance */
private static $instance;
public function __construct() {
self::$instance = $this;
}
public static function createFromRemoteParent(string $traceId, string $spanId, int $traceFlags = TraceFlags::DEFAULT, ?TraceStateInterface $traceState = null): SpanContextInterface { return self::$instance; }
public static function getInvalid(): SpanContextInterface { return self::$instance; }
public static function create(string $traceId, string $spanId, int $traceFlags = TraceFlags::DEFAULT, ?TraceStateInterface $traceState = null): SpanContextInterface { return self::$instance; }
public function getTraceId(): string { return ""; }
public function getTraceIdBinary(): string { return ""; }
public function getSpanId(): string { return ""; }
public function getSpanIdBinary(): string { return ""; }
public function getTraceFlags(): int { return 0; }
public function getTraceState(): ?TraceStateInterface { return null; }
public function isValid(): bool { return false; }
public function isRemote(): bool { return false; }
public function isSampled(): bool { return false; }
}
class DummyScopeInterface implements ScopeInterface {
public function detach(): int { return 0; }
}
class DummySpanInterface implements SpanInterface {
/** @var DummySpanInterface $instance */
private static $instance;
public function __construct() {
self::$instance = $this;
}
public static function fromContext(ContextInterface $context): SpanInterface { return self::$instance; }
public static function getCurrent(): SpanInterface { return self::$instance; }
public static function getInvalid(): SpanInterface { return self::$instance; }
public static function wrap(SpanContextInterface $spanContext): SpanInterface { return self::$instance; }
public function getContext(): SpanContextInterface { return new DummySpanContextInterface(); }
public function isRecording(): bool { return false; }
/** @phpstan-ignore-next-line */
public function setAttribute(string $key, $value): SpanInterface { return self::$instance; }
/** @phpstan-ignore-next-line */
public function setAttributes(iterable $attributes): SpanInterface { return self::$instance; }
/** @phpstan-ignore-next-line */
public function addEvent(string $name, iterable $attributes = [], ?int $timestamp = null): SpanInterface { return $this; }
/** @phpstan-ignore-next-line */
public function recordException(Throwable $exception, iterable $attributes = []): SpanInterface { return $this; }
public function updateName(string $name): SpanInterface { return $this; }
public function setStatus(string $code, ?string $description = null): SpanInterface { return $this; }
public function end(?int $endEpochNanos = null): void { }
public function activate(): ScopeInterface { return new DummyScopeInterface(); }
public function storeInContext(ContextInterface $context): ContextInterface { return new DummyContextInterface(); }
}
class Tracer {
/** @var Tracer $instance */
private static $instance = null;
/** @var OpenTelemetry\SDK\Trace\TracerProviderInterface $tracerProvider */
private $tracerProvider = null;
/** @var OpenTelemetry\API\Trace\TracerInterface $tracer */
private $tracer = null;
public function __construct() {
$OPENTELEMETRY_ENDPOINT = Config::get(Config::OPENTELEMETRY_ENDPOINT);
if ($OPENTELEMETRY_ENDPOINT) {
$transport = (new OtlpHttpTransportFactory())->create($OPENTELEMETRY_ENDPOINT, 'application/x-protobuf');
$exporter = new SpanExporter($transport);
$resource = ResourceInfoFactory::emptyResource()->merge(
ResourceInfo::create(Attributes::create(
[ResourceAttributes::SERVICE_NAME => Config::get(Config::OPENTELEMETRY_SERVICE)]
), ResourceAttributes::SCHEMA_URL),
);
$this->tracerProvider = TracerProvider::builder()
->addSpanProcessor(new SimpleSpanProcessor($exporter))
->setResource($resource)
->setSampler(new ParentBased(new AlwaysOnSampler()))
->build();
$this->tracer = $this->tracerProvider->getTracer('io.opentelemetry.contrib.php');
$context = TraceContextPropagator::getInstance()->extract(getallheaders());
$span = $this->tracer->spanBuilder($_SESSION['name'] ?? 'not logged in')
->setParent($context)
->setSpanKind(SpanKind::KIND_SERVER)
->setAttribute('php.request', json_encode($_REQUEST))
->setAttribute('php.server', json_encode($_SERVER))
->setAttribute('php.session', json_encode($_SESSION ?? []))
->startSpan();
$scope = $span->activate();
register_shutdown_function(function() use ($span, $scope) {
$span->end();
$scope->detach();
$this->tracerProvider->shutdown();
});
}
}
/**
* @param string $name
* @return OpenTelemetry\API\Trace\SpanInterface
*/
private function _start(string $name) {
if ($this->tracer != null) {
$span = $this->tracer
->spanBuilder($name)
->setSpanKind(SpanKind::KIND_SERVER)
->startSpan();
$span->activate();
} else {
$span = new DummySpanInterface();
}
return $span;
}
/**
* @param string $name
* @return OpenTelemetry\API\Trace\SpanInterface
*/
public static function start(string $name) {
return self::get_instance()->_start($name);
}
public static function get_instance() : Tracer {
if (self::$instance == null)
self::$instance = new self();
return self::$instance;
}
}
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