如何在grpc-dart实现中实现健康检查？

dependencies:
  grpc_health: ^1.0.0

import 'package:grpc/grpc.dart';
import 'package:grpc_health/grpc_health.dart';

class HealthServiceImpl extends HealthServiceBase {
  @override
  Future<ServingStatus> checkService(ServerContext context, HealthCheckRequest request) async {
    // 在这里实现健康检查逻辑
    // 返回ServingStatus.SERVING表示服务正常
    // 返回ServingStatus.NOT_SERVING表示服务不可用
    // 返回ServingStatus.UNKNOWN表示服务状态未知
    return ServingStatus.SERVING;
  }
}

import 'package:grpc/grpc.dart';
import 'package:grpc_health/grpc_health.dart';

void main() async {
  final server = Server([HealthServiceImpl()]);
  await server.serve(port: 50051);
  print('Server listening on port ${server.port}...');
}

import 'package:grpc/grpc.dart';
import 'package:grpc_health/grpc_health.dart';

void main() async {
  final channel = ClientChannel('localhost',
      port: 50051,
      options: const ChannelOptions(credentials: ChannelCredentials.insecure()));
  final client = HealthClient(channel);
  final response = await client.check(HealthCheckRequest(service: ''));
  print('Service status: ${response.status}');
  await channel.shutdown();
}