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#!/usr/bin/python
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import socket, os, time, select, urllib, sys, threading
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class Meshenger:
devices = {} #the dictionary of all the nodes this this node has seen
serve_port = "13338"
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announce_port = 13337
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#own_ip = "0.0.0.0"
msg_dir = os.path.relpath('msg/')
exitapp = False #to kill all threads on
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index_last_update = str(time.time())
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def __init__(self):
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os.system("echo 1 >> /proc/sys/net/ipv6/conf/br-lan/disable_ipv6")
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self.own_ip = self.get_ip_adress()
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if not os.path.exists(self.msg_dir):
os.mkdir(self.msg_dir)
print 'Making message directory'
print 'Building own index for the first time\n'
self.build_index()
try:
d = threading.Thread(target=self.discover)
d.daemon = True
d.start()
a = threading.Thread(target=self.announce)
a.daemon = True
a.start()
s = threading.Thread(target=self.serve)
s.daemon = True
s.start()
except (KeyboardInterrupt, SystemExit):
print 'exiting discovery thread'
d.join()
a.join()
sys.exit()
while True:
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if len(self.devices) > 0:
print 'found', len(self.devices),'device(s) retreiving indices'
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for device in self.devices:
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nodepath = self.ip_to_hash(device) #make a folder for the node (nodes/'hash'/)
nodeupdatepath = os.path.join(self.ip_to_hash(device), 'lastupdate')
print 'Checking age of foreign node index'
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print self.devices[device]
foreign_node_update = open(nodeupdatepath).read()
print foreign_node_update
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if self.devices[device] > foreign_node_update:
print 'Foreign node"s index is newer, proceed to download index'
self.get_index(device, nodepath)
print 'downloading messages'
self.get_messages(device, nodepath)
print 'updating own index'
self.build_index()
time.sleep(5) #free process or ctrl+c
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def node_timestamp(self, ip):
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updatepath = os.path.join(self.ip_to_hash(ip), 'lastupdate')
with open(updatepath, 'wb') as lastupdate:
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lastupdate.write(self.devices[ip])
#return updatepath
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def announce(self):
"""
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Announce the node's existance to other nodes
"""
print 'Announcing'
while not self.exitapp:
sock = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
sock.sendto(self.index_last_update, ("ff02::1", self.announce_port))
sock.close()
time.sleep(5)
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def discover(self):
"""
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Discover other devices by listening to the Meshenger announce port
"""
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print 'Discovering'
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bufferSize = 1024 # whatever you need
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s = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
s.bind(('::', self.announce_port))
s.setblocking(0)
while not self.exitapp:
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result = select.select([s],[],[])[0][0].recvfrom(bufferSize)
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if result[1][0] not in self.devices and result[1][0] != self.own_ip:
#loop for first time
self.devices[result[1][0]] = result[0]
node_timestamp(result[1][0])
if result[1][0] in self.devices and result[1][0] != self.own_ip:
self.devices[result[1][0]] = result[0]
#self.devices.append(result[1][0])
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time.sleep(1)
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def serve(self):
"""
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Initialize the server
"""
print 'Serving'
import meshenger_serve
meshenger_serve.main()
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def build_index(self):
"""
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Make an index file of all the messages present on the node.
Save the time of the last update.
"""
if not os.path.exists('index'):
with open('index','wb') as index:
index.write('')
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previous_index = []
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current_index = os.listdir(self.msg_dir)
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if current_index != previous_index:
with open('index', 'wb') as index:
for message in os.listdir(self.msg_dir):
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index.write(message)
index.write('\n')
self.index_last_update = str(int(time.time()))
with open('index_last_update', 'wb') as indexupdate: ### misschien is dit overbodig
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indexupdate.write(str(int(time.time())))
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current_index = previous_index
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def get_index(self,ip, path):
"""
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Download the indices from other nodes.
"""
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os.system('wget http://['+ip+'%adhoc0]:'+self.serve_port+'/index -O '+os.path.join(path,'index'))
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def get_messages(self, ip, path):
"""
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Get new messages from other node based on it's index file
"""
try:
with open(os.path.join(path,'index')) as index:
index = index.read().split('\n')
for message in index:
messagepath = os.path.join(os.path.abspath(self.msg_dir), message)
if not os.path.exists(messagepath):
print 'downloading', message, 'to', messagepath
os.system('wget http://['+ip+'%adhoc0]:'+self.serve_port+'/msg/'+message+' -O '+messagepath)
except:
pass
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def ip_to_hash(self, ip):
"""
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Convert a node's ip into a hash and make a directory to store it's files
"""
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import hashlib
hasj = hashlib.md5(ip).hexdigest()
nodepath = os.path.join(os.path.abspath('nodes/'), hasj)
if not os.path.exists(nodepath):
os.mkdir('nodes')
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os.mkdir(nodepath)
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return nodepath
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def clientsite(self):
a = ''
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#tools
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def get_ip_adress(self):
"""
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Hack to adhoc0's inet6 adress
"""
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if not os.path.isfile('interfaceip6adress'):
os.system('ifconfig -a adhoc0 | grep inet6 > /root/meshenger/interfaceip6adress')
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with open('interfaceip6adress', 'r') as a:
return a.read().split()[2].split('/')[0]
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if __name__ == "__main__":
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print "test"
try:
meshenger = Meshenger()
except (KeyboardInterrupt, SystemExit):
exitapp = True
raise
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