63 lines
2.0 KiB
Python
63 lines
2.0 KiB
Python
# -*- tab-width: 4; indent-tabs-mode: t -*-
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import socket
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import threading
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import traceback
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import select
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import time
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import gobject
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class GroupChatController(object):
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_MAX_MSG_SIZE = 500
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def __init__(self, address, port, data_cb):
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self._address = address
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self._port = port
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self._data_cb = data_cb
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self._setup_sender()
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self._setup_listener()
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def _setup_sender(self):
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self._send_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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# Make the socket multicast-aware, and set TTL.
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self._send_sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 20) # Change TTL (=20) to suit
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def _setup_listener(self):
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# Listener socket
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self._listen_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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# Set some options to make it multicast-friendly
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self._listen_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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try:
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self._listen_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
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except:
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pass
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self._listen_sock.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_TTL, 20)
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self._listen_sock.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_LOOP, 1)
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def start(self):
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# Set some more multicast options
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self._listen_sock.bind(('', self._port))
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self._listen_sock.settimeout(2)
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intf = socket.gethostbyname(socket.gethostname())
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self._listen_sock.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_IF, socket.inet_aton(intf) + socket.inet_aton('0.0.0.0'))
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self._listen_sock.setsockopt(socket.SOL_IP, socket.IP_ADD_MEMBERSHIP, socket.inet_aton(self._address) + socket.inet_aton('0.0.0.0'))
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# Watch the listener socket for data
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gobject.io_add_watch(self._listen_sock, gobject.IO_IN, self._handle_incoming_data)
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def _handle_incoming_data(self, source, condition):
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if not (condition & gobject.IO_IN):
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return
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msg = {}
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msg['data'], (msg['addr'], msg['port']) = source.recvfrom(self._MAX_MSG_SIZE)
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if self._data_cb:
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self._data_cb(msg)
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return True
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def send_msg(self, data):
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self._send_sock.sendto(data, (self._address, self._port))
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