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<?php
declare(strict_types=1);
namespace OpenTelemetry\Contrib\Otlp;
use OpenTelemetry\API\Signals;
use OpenTelemetry\SDK\Resource\Detectors\Sdk;
use OpenTelemetry\SemConv\ResourceAttributes;
use UnexpectedValueException;
class OtlpUtil
{
/**
* gRPC per-signal methods
* @see protobuf *ServiceClient
*/
private const METHODS = [
Signals::TRACE => '/opentelemetry.proto.collector.trace.v1.TraceService/Export',
Signals::METRICS => '/opentelemetry.proto.collector.metrics.v1.MetricsService/Export',
Signals::LOGS => '/opentelemetry.proto.collector.logs.v1.LogsService/Export',
];
public static function method(string $signal): string
{
if (!array_key_exists($signal, self::METHODS)) {
throw new UnexpectedValueException('gRPC method not defined for signal: ' . $signal);
}
return self::METHODS[$signal];
}
/**
* @link https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/exporter.md#user-agent
*/
public static function getUserAgentHeader(): array
{
$resource = (new Sdk())->getResource();
return ['User-Agent' => sprintf(
'OTel OTLP Exporter PHP/%s',
$resource->getAttributes()->get(ResourceAttributes::TELEMETRY_SDK_VERSION) ?: 'unknown'
)];
}
}
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