openmedialibrary/oml/localnodes.py

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# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
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from __future__ import division
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import json
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import socket
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import struct
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import thread
from threading import Thread
import time
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from utils import valid, get_public_ipv6, get_local_ipv4, get_interface
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from settings import preferences, server, USER_ID, sk
import state
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import db
import user.models
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import logging
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logger = logging.getLogger('oml.localnodes')
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def can_connect(data):
try:
if ':' in data['host']:
s = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
else:
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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s.settimeout(1)
s.connect((data['host'], data['port']))
s.close()
return True
except:
pass
logger.debug('can_connect failed')
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return False
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class LocalNodesBase(Thread):
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_PORT = 9851
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_TTL = 1
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def __init__(self, nodes):
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self._socket = None
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self._active = True
self._nodes = nodes
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Thread.__init__(self)
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if not server['localnode_discovery']:
return
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self.daemon = True
self.start()
def get_packet(self):
self.host = self.get_ip()
if self.host:
message = json.dumps({
'username': preferences.get('username', 'anonymous'),
'host': self.host,
'port': server['node_port'],
'cert': server['cert']
})
sig = sk.sign(message, encoding='base64')
packet = json.dumps([sig, USER_ID, message])
else:
packet = None
return packet
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def get_socket(self):
pass
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def send(self):
pass
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def receive(self):
last = time.mktime(time.localtime())
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while self._active:
try:
s = self.get_socket()
s.settimeout(2)
s.bind(('', self._PORT))
while self._active:
data, addr = s.recvfrom(1024)
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if self._active:
while data[-1] == '\0':
data = data[:-1] # Strip trailing \0's
data = self.verify(data)
if data:
self.update_node(data)
except socket.timeout:
now = time.mktime(time.localtime())
if now - last > 60:
last = now
thread.start_new_thread(self.send, ())
except:
logger.debug('receive failed. restart later', exc_info=1)
time.sleep(10)
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def verify(self, data):
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try:
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packet = json.loads(data)
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except:
return None
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if len(packet) == 3:
sig, user_id, data = packet
if valid(user_id, data, sig):
message = json.loads(data)
message['id'] = user_id
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for key in ['id', 'username', 'host', 'port', 'cert']:
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if key not in message:
return None
return message
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def update_node(self, data):
#fixme use local link address
#print addr
if data['id'] != USER_ID:
if data['id'] not in self._nodes:
thread.start_new_thread(self.new_node, (data, ))
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elif can_connect(data):
self._nodes[data['id']] = data
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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):
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logger.debug('NEW NODE %s', data)
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if can_connect(data):
self._nodes[data['id']] = data
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with db.session():
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u = user.models.User.get_or_create(data['id'])
u.info['username'] = data['username']
u.info['local'] = data
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u.update_name()
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u.save()
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state.nodes.queue('add', u.id)
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self.send()
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def get_ip(self):
pass
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def run(self):
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self.send()
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self.receive()
def join(self):
self._active = False
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if self._socket:
try:
self._socket.shutdown(socket.SHUT_RDWR)
except:
pass
self._socket.close()
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return Thread.join(self)
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class LocalNodes4(LocalNodesBase):
_BROADCAST = "239.255.255.250"
_TTL = 1
def send(self):
packet = self.get_packet()
if packet:
sockaddr = (self._BROADCAST, self._PORT)
s = socket.socket (socket.AF_INET, socket.SOCK_DGRAM)
s.setsockopt (socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, self._TTL)
try:
s.sendto(packet + '\0', sockaddr)
except:
logger.debug('LocalNodes4.send failed', exc_info=1)
s.close()
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def get_socket(self):
s = socket.socket (socket.AF_INET, socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
mreq = struct.pack("=4sl", socket.inet_aton(self._BROADCAST), socket.INADDR_ANY)
s.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
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self._socket = s
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return s
def get_ip(self):
return get_local_ipv4()
class LocalNodes6(LocalNodesBase):
_BROADCAST = "ff02::1"
def send(self):
packet = self.get_packet()
if packet:
logger.debug('send6 %s', packet)
ttl = struct.pack('@i', self._TTL)
address = self._BROADCAST + get_interface()
addrs = socket.getaddrinfo(address, self._PORT, socket.AF_INET6, socket.SOCK_DGRAM)
addr = addrs[0]
(family, socktype, proto, canonname, sockaddr) = addr
s = socket.socket(family, socktype, proto)
s.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_HOPS, ttl)
try:
s.sendto(packet + '\0', sockaddr)
except:
logger.debug('LocalNodes6.send failed', exc_info=1)
s.close()
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def get_socket(self):
s = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
group_bin = socket.inet_pton(socket.AF_INET6, self._BROADCAST) + '\0'*4
s.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_JOIN_GROUP, group_bin)
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self._socket = s
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return s
def get_ip(self):
return get_public_ipv6()
class LocalNodes(object):
_active = True
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_nodes4 = None
_nodes6 = None
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def __init__(self):
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self._nodes = {}
if not server['localnode_discovery']:
return
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self._nodes4 = LocalNodes4(self._nodes)
self._nodes6 = LocalNodes6(self._nodes)
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def cleanup(self):
if self._active:
for id in self._nodes.keys():
if not can_connect(self._nodes[id]):
del self._nodes[id]
if not self._active:
break
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def get(self, user_id):
if user_id in self._nodes:
if can_connect(self._nodes[user_id]):
return self._nodes[user_id]
def join(self):
self._active = False
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if self._nodes4:
self._nodes4.join()
if self._nodes6:
self._nodes6.join()