Accept a persistent tcp connection in Golang Server

Question

I am experimenting with Go - and would like to create a TCP server which I can telnet to, send commands and receive responses.

const (
    CONN_HOST = \"localhos         


        

Answer 1

Not sure if this is what you're looking for. Taken from net/http implementation, wrapping your net.TCPListener's Accept method.

tcpKeepAliveListener{listener.(*net.TCPListener)}

type tcpKeepAliveListener struct {
    *net.TCPListener
}

func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
    tc, err := ln.AcceptTCP()
    if err != nil {
        return
    }
    tc.SetKeepAlive(true)
    tc.SetKeepAlivePeriod(3 * time.Minute)
    return tc, nil
}

Refer : Link 1 & Link 2

Answer 2

Your second example with the loop is already what you want. You simply loop and read as long as you want (or probably until some read/write timeout or an external cancellation signal).

However it still has an error in it: TCP gives you a stream of bytes, where it is not guaranteed that one write from a side will yield exactly one read on the other side with the same data length. This means if the client writes PING\r\n you could still receive only PI in the first read. You could fix that by using a bufio.Scanner and always read up to the first newline.