lib/socket/examples/socket_simple_server.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #     http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14
  15 # Simple server example using a non-blocking `TCPServer`
  16 module socket_simple_server
  17
  18 import socket
  19
  20 if args.is_empty then
  21         print "Usage : socket_simple_server <port>"
  22         exit 1
  23 end
  24
  25 var port = args[0].to_i
  26
  27 # Open the listening socket
  28 var socket = new TCPServer(port)
  29 socket.listen 4
  30 socket.blocking = false
  31
  32 print "Listening on port {socket.port}"
  33
  34 # Loop until a single client connects
  35 var client: nullable TCPStream = null
  36 while client == null do
  37         printn "."
  38         sys.nanosleep(0, 200000)
  39
  40         client = socket.accept
  41 end
  42 print " Connected"
  43
  44 # Communicate
  45 print client.read_line
  46 client.write "Hello client!\n"
  47 print client.read_line
  48 client.write "Bye client!\n"
  49
  50 client.close