openmedialibrary/oml/localnodes.py

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2014-05-12 12:57:47 +00:00
# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
import socket
import thread
import json
import struct
from threading import Thread
from settings import preferences, server, USER_ID
from node.utils import get_public_ipv6
def can_connect(data):
try:
s = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
s.settimeout(1)
s.connect((data['host'], data['port']))
s.close()
return True
except:
pass
return False
class LocalNodes(Thread):
_active = True
_nodes = {}
_BROADCAST = "ff02::1"
_PORT = 9851
TTL = 2
def __init__(self, app):
self._app = app
Thread.__init__(self)
self.daemon = True
self.start()
self.host = get_public_ipv6()
self.send()
def send(self):
s = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
ttl = struct.pack('@i', self.TTL)
s.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_HOPS, ttl)
message = json.dumps({
'id': USER_ID,
'username': preferences.get('username', 'anonymous'),
'host': self.host,
'port': server['node_port'],
})
s.sendto(message + '\0', (self._BROADCAST, self._PORT))
def receive(self):
s = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
s.bind(('', self._PORT))
group_bin = socket.inet_pton(socket.AF_INET6, self._BROADCAST) + '\0'*4
s.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_JOIN_GROUP, group_bin)
while self._active:
data, addr = s.recvfrom(1024)
while data[-1] == '\0':
data = data[:-1] # Strip trailing \0's
data = self.validate(data)
if data:
if data['id'] not in self._nodes:
thread.start_new_thread(self.new_node, (data, ))
else:
print 'UPDATE NODE', data
self._nodes[data['id']] = data
def validate(self, data):
try:
data = json.loads(data)
except:
return None
for key in ['id', 'username', 'host', 'port']:
if key not in data:
return None
return data
def get(self, user_id):
if user_id in self._nodes:
if can_connect(self._nodes[user_id]):
return self._nodes[user_id]
def new_node(self, data):
print 'NEW NODE', data
if can_connect(data):
self._nodes[data['id']] = data
with self._app.app_context():
import user.models
u = user.models.User.get_or_create(data['id'])
u.info['username'] = data['username']
u.info['local'] = data
u.save()
self.send()
def run(self):
self.receive()
def join(self):
self._active = False
return Thread.join(self)