examples/socket_server.nit

   1 # This file is part of NIT ( http://www.nitlanguage.org ).
   2 #
   3 # Copyright 2013 Matthieu Lucas <lucasmatthieu@gmail.com>
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 # Server sample using the Socket module which allow client to connect
  18 module socket_server
  19
  20 import socket
  21
  22 if args.is_empty then
  23         print "Usage : socket_server <port>"
  24         return
  25 end
  26
  27 var socket = new Socket.stream_with_port(args[0].to_i)
  28 print "[PORT] : {socket.port.to_s}"
  29 print "Binding ... {socket.bind.to_s}"
  30 print "Listening ... {socket.listen(3).to_s}"
  31
  32 var clients = new Array[Socket]
  33 var max = socket
  34 loop
  35         var fs = new SocketObserver(true, true, true)
  36         fs.readset.set(socket)
  37
  38         for c in clients do fs.readset.set(c)
  39
  40         if fs.select(max, 4, 0) == 0 then
  41                 print "Error occured in select {sys.errno.strerror}"
  42                 break
  43         end
  44
  45         if fs.readset.is_set(socket) then
  46                 var ns = socket.accept
  47                 print "Accepting {ns.address} ... "
  48                 print "[Message from {ns.address}] : {ns.read}"
  49                 ns.write("Goodbye client.")
  50                 print "Closing {ns.address} ... {ns.close.to_s}"
  51         end
  52 end
  53