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