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# Parallel Python Software: http://www.parallelpython.com
# Copyright (c) 2005-2012, Vitalii Vanovschi
# All rights reserved.
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the author nor the names of its contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
# THE POSSIBILITY OF SUCH DAMAGE.
"""Parallel Python Software, Auto-Discovery Service
http://www.parallelpython.com - updates, documentation, examples and support
forums
"""
import socket
import sys
import time
import threading
import ppcommon
copyright = "Copyright (c) 2005-2012 Vitalii Vanovschi. All rights reserved"
version = "1.6.4"
# broadcast every 10 sec
BROADCAST_INTERVAL = 10
class Discover(object):
"""Auto-discovery service class"""
def __init__(self, base, isclient=False):
self.base = base
self.hosts = []
self.isclient = isclient
def run(self, interface_addr, broadcast_addr):
"""Starts auto-discovery"""
self.interface_addr = interface_addr
self.broadcast_addr = broadcast_addr
self.bsocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.bsocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.bsocket.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
try:
self.listen()
except:
sys.excepthook(*sys.exc_info())
def broadcast(self):
"""Sends a broadcast"""
if self.isclient:
self.base.logger.debug("Client sends initial broadcast to (%s, %i)"
% self.broadcast_addr)
self.bsocket.sendto("C", self.broadcast_addr)
else:
while True:
if self.base._exiting:
return
self.base.logger.debug("Server sends broadcast to (%s, %i)"
% self.broadcast_addr)
self.bsocket.sendto("S", self.broadcast_addr)
time.sleep(BROADCAST_INTERVAL)
def listen(self):
"""Listens for broadcasts from other clients/servers"""
self.base.logger.debug("Listening (%s, %i)" % self.interface_addr)
self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
self.socket.settimeout(5)
self.socket.bind(self.interface_addr)
ppcommon.start_thread("broadcast", self.broadcast)
while True:
try:
if self.base._exiting:
return
message, (host, port) = self.socket.recvfrom(1024)
remote_address = (host, self.broadcast_addr[1])
hostid = host + ":" + str(self.broadcast_addr[1])
self.base.logger.debug("Discovered host (%s, %i) message=%c"
% (remote_address + (message[0], )))
if not self.base.autopp_list.get(hostid, 0) and self.isclient \
and message[0] == 'S':
self.base.logger.debug("Connecting to host %s" % (hostid, ))
ppcommon.start_thread("ppauto_connect1", self.base.connect1,
remote_address+(False, ))
if not self.isclient and message[0] == 'C':
self.base.logger.debug("Replying to host %s" % (hostid, ))
self.bsocket.sendto("S", self.broadcast_addr)
except socket.timeout:
pass
except:
self.base.logger.error("An error has occured during execution of "
"Discover.listen")
sys.excepthook(*sys.exc_info())
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