class StreamTransport

final class StreamTransport implements TransportInterface {
    
    /**
     * @param resource|null $stream
     *
     * @psalm-param CONTENT_TYPE $contentType
     */
    public function __construct($stream, string $contentType) {
    }
    public function contentType() : string {
        return $this->contentType;
    }
    public function send(string $payload, ?CancellationInterface $cancellation = null) : FutureInterface {
        if (!$this->stream) {
            return new ErrorFuture(new BadMethodCallException('Transport closed'));
        }
        set_error_handler(static function (int $errno, string $errstr, string $errfile, int $errline) : bool {
            throw new ErrorException($errstr, 0, $errno, $errfile, $errline);
        });
        try {
            $bytesWritten = fwrite($this->stream, $payload);
        } catch (Throwable $e) {
            return new ErrorFuture($e);
        } finally {
            restore_error_handler();
        }
        if ($bytesWritten !== strlen($payload)) {
            return new ErrorFuture(new RuntimeException(sprintf('Write failure, wrote %d of %d bytes', $bytesWritten, strlen($payload))));
        }
        return new CompletedFuture(null);
    }
    public function shutdown(?CancellationInterface $cancellation = null) : bool {
        if (!$this->stream) {
            return false;
        }
        $flush = @fflush($this->stream);
        $this->stream = null;
        return $flush;
    }
    public function forceFlush(?CancellationInterface $cancellation = null) : bool {
        if (!$this->stream) {
            return false;
        }
        return @fflush($this->stream);
    }

}