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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