尝试访问同一网络上的grpc服务器时，grpc客户端dns解析失败

Question

我正试图从Python客户端调用在.Net Core项目上运行的GRPC服务器。

在localhost:5001上运行时可以正常工作，但是在与192.168.1.230:5001相同的网络中使用机器的实际IP运行时，则无法正常工作，并且出现错误DNS resolution failed

我已经下载了SSL证书，目前正在从客户端读取它作为文件。在localhost上运行时它可以工作，所以我认为这不是问题。

是否存在更好的方法来进行这种测试，以使客户端在与服务器相同的网络上运行在不同的设备上？在开发过程中在外部托管GRPC服务器似乎并不是最好的解决方案。

Python代码：

import grpc
import datamessage_pb2 as datamessage
import datamessage_pb2_grpc as datamessageService


def main():
    print("Calling grpc server")
    with open("localhost.cer", "rb") as file:
        cert = file.read()
    credentials = grpc.ssl_channel_credentials(cert)
    channel = grpc.secure_channel("https://192.168.1.230:5001", credentials)
    # channel = grpc.secure_channel("localhost:5001", credentials)
    stub = datamessageService.StationDataHandlerStub(channel)
    request = datamessage.StationDataModel(
        temperature=22.3, humidity=13.3, soilMoisture=35.0)

    result = stub.RegisterNewStationData(request)
    print(result)


main()

Program.cs中的服务器设置：

public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseUrls("https://*:5001");
                    webBuilder.UseStartup<Startup>();
                });

防火墙中的设置：

跟踪：

grpc._channel._Rendezvous: <_Rendezvous of RPC that terminated with:
        status = StatusCode.UNAVAILABLE
        details = "DNS resolution failed"
        debug_error_string = "{"created":"@1576101634.549000000","description":"Failed to pick subchannel","file":"src/core/ext/filters/client_channel/client_channel.cc","file_line":3934,"referenced_errors":[{"created":"@1576101634.549000000","description":"Resolver transient failure","file":"src/core/ext/filters/client_channel/resolving_lb_policy.cc","file_line":262,"referenced_errors":[{"created":"@1576101634.549000000","description":"DNS resolution failed","file":"src/core/ext/filters/client_channel/resolver/dns/native/dns_resolver.cc","file_line":202,"grpc_status":14,"referenced_errors":[{"created":"@1576101634.549000000","description":"OS Error","file":"src/core/lib/iomgr/resolve_address_windows.cc","file_line":96,"os_error":"No such host is known.\r\n","syscall":"getaddrinfo","wsa_error":11001}]}]}]}"

Answer 1

在 Python gRPC 客户端中，需要无协议调用通道 (https:)。所以，我在 dotnet 核心框架中调用了 gRPC 服务，并且它工作正常。请注意，dotnet gRPC 服务器正在侦听 https://localhost:5001。

with open('localhost.crt', 'rb') as f:
    credentials = grpc.ssl_channel_credentials(f.read())
with grpc.secure_channel('localhost:5001', credentials) as channel:
    stub = pb2_grpc.GreeterStub(channel)
    request = pb2.HelloRequest(name = "GreeterPythonClient")
    response = stub.SayHello(request)