Set keepalive in C# client

[koen.vl...@gmail.com]

I'm using the gRPC client in C# and using a long-lived duplex stream. However, the TCP connection is closed at some time and therefore I would like to use a keepalive in the client. The server (written in Go) is already configured correctly for the keepalive and already tested with clients written in Go.

I use the following code to set a keepalive for 5 minutes and also to enable tracing for viewing all incoming/outgoing bytes.

    Environment.SetEnvironmentVariable("GRPC_TRACE", "tcp,channel,http,secure_endpoint");

    Environment.SetEnvironmentVariable("GRPC_VERBOSITY", "DEBUG");

    var callCredentials = CallCredentials.FromInterceptor(Interceptor());

    var roots = Encoding.UTF8.GetString(Resources.roots);

    Channel = new Channel(address, ChannelCredentials.Create(new SslCredentials(roots), callCredentials), new[]

    {

        new ChannelOption("grpc.keepalive_time_ms", 5 * 60 *  1000), // 5 minutes

    });

    await Channel.ConnectAsync(DateTime.UtcNow.AddSeconds(5));

However, in the log there are no bytes sent at 5 minutes and the connection is closed as I can no longer send/receive messages via the same stream after the stream has been idle for some time.

How would I properly enable keepalive?

[Jan Tattermusch]

Have you tried adding GrpcEnvironment.SetLogger(new ConsoleLogger());?

Getting gRPC traces in C# is a bit more complicated that it ought to be (https://github.com/grpc/grpc/issues/10574)

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[koen.vl...@gmail.com]

I already had a logger in place and I was also seeing logs, there were just no outgoing logs at the 5 minute mark or any time after that, even though I still had a connection open.

For now, I'm manually sending ping messages every 5 minutes on the channel to keep it open, but this should not be necessary as e.g. in Go keep-alive already works.

On Monday, July 24, 2017 at 2:21:54 PM UTC+2, Jan Tattermusch wrote:

Have you tried adding GrpcEnvironment.SetLogger(new ConsoleLogger());?

Getting gRPC traces in C# is a bit more complicated that it ought to be (https://github.com/grpc/grpc/issues/10574)

On Sat, Jul 22, 2017 at 9:08 PM, <koen.vl...@gmail.com> wrote:

I'm using the gRPC client in C# and using a long-lived duplex stream. However, the TCP connection is closed at some time and therefore I would like to use a keepalive in the client. The server (written in Go) is already configured correctly for the keepalive and already tested with clients written in Go.

I use the following code to set a keepalive for 5 minutes and also to enable tracing for viewing all incoming/outgoing bytes.

    Environment.SetEnvironmentVariable("GRPC_TRACE", "tcp,channel,http,secure_endpoint");

    Environment.SetEnvironmentVariable("GRPC_VERBOSITY", "DEBUG");

    var callCredentials = CallCredentials.FromInterceptor(Interceptor());

    var roots = Encoding.UTF8.GetString(Resources.roots);

    Channel = new Channel(address, ChannelCredentials.Create(new SslCredentials(roots), callCredentials), new[]

    {

        new ChannelOption("grpc.keepalive_time_ms", 5 * 60 *  1000), // 5 minutes

    });

    await Channel.ConnectAsync(DateTime.UtcNow.AddSeconds(5));

However, in the log there are no bytes sent at 5 minutes and the connection is closed as I can no longer send/receive messages via the same stream after the stream has been idle for some time.

How would I properly enable keepalive?

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[Jan Tattermusch]

In that case, please file a github issue and include as much info as possible to reproduce.

thanks

Jan

[wangju...@gmail.com]

I encounter the same problem, and I don't know how to deal with it.