Hi All.
I see https://github.com/golang/go/issues/10940 issue that relates to my
problem, and it looks like I must read from / write to a connetion to check
whether it is alive, but want to ask if something get changed since this
bug was closed without a fix.
A bit of context:
I'm dialing to remote server, then "swapping sides" and establish a gRPC
listener on a client side, while remote server becomes gRPC client:
func connectAndServe(service *controlPCService) error {
conn, err := net.Dial("tcp", config.CloudURL)
if err != nil {
return err
}
err = conn.(*net.TCPConn).SetKeepAlive(true)
if err != nil {
conn.Close()
return err
}
err = conn.(*net.TCPConn).SetKeepAlivePeriod(10 * time.Second)
if err != nil {
conn.Close()
return err
}
var opts []grpc.ServerOption
grpcServer := grpc.NewServer(opts...)
service.grpcServer = grpcServer
pb.RegisterControlPCServiceServer(grpcServer, service)
grpcServer.Serve(NewListener(conn)) // it blocks
return nil
}
NewListener(conn) just returns this connection once to gRPC server, and
then blocks to emulate a situation, that there are no other connections.
The problem here, is that gRPC server still thinks that it is a server =>
after this single connection was closed by remote side, it just waits for
another one instead of exiting.
AFAIU the only thing I can do here is to listen on connection for POLLHUP
or try to read 0 bytes from it until I get EOF, but as the issue 10940
says, I can't do it. Is there any means to overcome it except of
implemening some kind of keepalive logic using gRPC calls?
Thanks in advance,
Sergey.
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