Question

我正在尝试实现服务器端流rpc，以将消息从服务器发送到客户端。

rpc CheckSystem(CheckSystemRequest) returns (stream CheckSystemResponse) {}

服务器代码：

public override Task CheckSystem(CheckSystemRequest request, IServerStreamWriter<CheckSystemResponse> responseStream, ServerCallContext context) {
  return Task.Run(async () => {
    for(int i = 1; i <= 10; i++) { 
      await responseStream.WriteAsync(new CheckSystemResponse { Type = i.ToString() });
      Console.WriteLine($"{DateTime.Now}: Sent {i}");
      Thread.Sleep(10000);
    }
  });
}

客户代码：

public static async Task TestAsync() {
  try {        
    using (var call = client.CheckSystem(new CheckSystemRequest { Code = "1" })) {
      var responseStream = call.ResponseStream;
      while (await responseStream.MoveNext()) {
        var current = responseStream.Current;
        Console.WriteLine($"{DateTime.Now}: Received: Type = {current.Type}");
      }
    }
  }
  catch (Exception ex) {
    Console.WriteLine(ex.Message);
  }
}

启动后，我看到在服务器端每10秒发送一条消息。 Screenshot #1。

13.12.2019 **16:31:31**: Sent 1
13.12.2019 **16:31:41**: Sent 2
13.12.2019 16:31:51: Sent 3
13.12.2019 16:32:01: Sent 4
13.12.2019 16:32:11: Sent 5
13.12.2019 16:32:21: Sent 6
13.12.2019 16:32:31: Sent 7
13.12.2019 16:32:41: Sent 8
13.12.2019 16:32:51: Sent 9
13.12.2019 16:33:01: Sent 10

但是，只有在服务器发送第二条消息之后，客户端才开始处理第一条消息。 Screenshot #2

13.12.2019 **16:31:41**: Received: Type = 1
13.12.2019 **16:31:41**: Received: Type = 2
13.12.2019 16:31:51: Received: Type = 3
13.12.2019 16:32:01: Received: Type = 4
13.12.2019 16:32:11: Received: Type = 5
13.12.2019 16:32:21: Received: Type = 6
13.12.2019 16:32:31: Received: Type = 7
13.12.2019 16:32:41: Received: Type = 8
13.12.2019 16:32:51: Received: Type = 9
13.12.2019 16:33:01: Received: Type = 10

这种行为可能是什么原因？以及如何解决？

C＃Grpc服务器端流式RPC。客户仅收到第二条消息，而收到第一条消息

0 个答案: