Lets make a chat app over telnet

Its completely okay to play with your terminal

The idea is very simple. Build a server and use telnet as a client to relay messages.I have been playing with Go a lot recently and am really enjoying the process.

Well there is only one thing to create, the server to enable telnet communication.

	package server
	import (
	"fmt"
	"net"
	)
	type clients []net.Conn
	// stores all the connected clients
	var cls clients
	// Server represents the ftp server
	type Server struct {
	Port string
	}
	// NewServer returns a pointer to a new ftp server
	func NewServer(port string) *Server {
	return &Server{
	Port: port,
	}
	}
	// Run starts a the ftp server
	func (s *Server) Run() {
	// Resolve the passed port into an address
	addrs, err := net.ResolveTCPAddr("tcp", s.Port)
	if err != nil {
	return
	}
	// start listening to client connections
	listener, err := net.ListenTCP("tcp", addrs)
	if err != nil {
	fmt.Println(err)
	}
	// Infinite loop since we dont want the server to shut down
	for {
	// Accept the incomming connections
	conn, err := listener.Accept()
	if err != nil {
	// continue accepting connection even if an error occurs (if error occurs dont shut down)
	continue
	}
	// add the connection to our client list -cls
	cls = append(cls, conn)
	// Get the ip the server is running from
	ip, err := net.ResolveTCPAddr("tcp", conn.LocalAddr().String())
	if err != nil {
	fmt.Println("Could not resolve the server IP address")
	conn.Close()
	}
	// write back to the client (telnet connection) on successfull connection
	conn.Write([]byte("Connected To " + ip.IP.String() + "\r\n"))
	// run it as a go routine to allow multiple clients to connect at the same time
	go handleConn(conn)
	}
	}
	func handleConn(conn net.Conn) {
	// accept inputs
	var buf [512]byte
	for {
	n, err := conn.Read(buf[0:])
	if err != nil {
	return
	}
	for _, v := range cls {
	if v.RemoteAddr() != conn.RemoteAddr() {
	v.Write([]byte(buf[0:n]))
	}
	}
	fmt.Printf("%s", string(buf[0:n]))
	}
	}

view raw telnetchat.go hosted with ❤ by GitHub

Usage

package main
import "server"

func main(){
    server.NewServer(":4000")
    server.Run()
}

Suggestions are welcomed. Drop me a line on twitter @izohbiz or leave a comment.