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<?php
declare(strict_types=1);
namespace OpenTelemetry\Contrib\Otlp;
use AssertionError;
use function base64_decode;
use function bin2hex;
use Exception;
use Google\Protobuf\Internal\Message;
use InvalidArgumentException;
use OpenTelemetry\SDK\Common\Export\TransportInterface;
use function sprintf;
/**
* @internal
*
* @psalm-type SUPPORTED_CONTENT_TYPES = self::PROTOBUF|self::JSON|self::NDJSON
*/
final class ProtobufSerializer
{
private const PROTOBUF = 'application/x-protobuf';
private const JSON = 'application/json';
private const NDJSON = 'application/x-ndjson';
private string $contentType;
private function __construct(string $contentType)
{
$this->contentType = $contentType;
}
public static function getDefault(): ProtobufSerializer
{
return new self(self::PROTOBUF);
}
/**
* @psalm-param TransportInterface<SUPPORTED_CONTENT_TYPES> $transport
*/
public static function forTransport(TransportInterface $transport): ProtobufSerializer
{
switch ($contentType = $transport->contentType()) {
case self::PROTOBUF:
case self::JSON:
case self::NDJSON:
return new self($contentType);
default:
throw new InvalidArgumentException(sprintf('Not supported content type "%s"', $contentType));
}
}
public function serializeTraceId(string $traceId): string
{
switch ($this->contentType) {
case self::PROTOBUF:
return $traceId;
case self::JSON:
case self::NDJSON:
return base64_decode(bin2hex($traceId));
default:
throw new AssertionError();
}
}
public function serializeSpanId(string $spanId): string
{
switch ($this->contentType) {
case self::PROTOBUF:
return $spanId;
case self::JSON:
case self::NDJSON:
return base64_decode(bin2hex($spanId));
default:
throw new AssertionError();
}
}
public function serialize(Message $message): string
{
switch ($this->contentType) {
case self::PROTOBUF:
return $message->serializeToString();
case self::JSON:
//@todo https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/otlp.md#json-protobuf-encoding
return $message->serializeToJsonString();
case self::NDJSON:
return $message->serializeToJsonString() . "\n";
default:
throw new AssertionError();
}
}
/**
* @throws Exception
*/
public function hydrate(Message $message, string $payload): void
{
switch ($this->contentType) {
case self::PROTOBUF:
$message->mergeFromString($payload);
break;
case self::JSON:
case self::NDJSON:
// @phan-suppress-next-line PhanParamTooManyInternal
$message->mergeFromJsonString($payload, true);
break;
default:
throw new AssertionError();
}
}
}
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