# -*- coding: utf-8 -*- import socket import netifaces from zeroconf import ( ServiceBrowser, ServiceInfo, ServiceStateChange, Zeroconf ) from tornado.ioloop import PeriodicCallback import settings import state from tor_request import get_opener import logging logger = logging.getLogger(__name__) def can_connect(data): try: opener = get_opener(data['id']) headers = { 'User-Agent': settings.USER_AGENT, 'X-Node-Protocol': settings.NODE_PROTOCOL, 'Accept-Encoding': 'gzip', } if ':' in data['host']: url = 'https://[{host}]:{port}'.format(**data) else: url = 'https://{host}:{port}'.format(**data) opener.addheaders = list(zip(headers.keys(), headers.values())) opener.timeout = 1 r = opener.open(url) version = r.headers.get('X-Node-Protocol', None) if version != settings.NODE_PROTOCOL: logger.debug('version does not match local: %s remote %s (%s)', settings.NODE_PROTOCOL, version, data['id']) return False c = r.read() return True except: pass #logger.debug('failed to connect to local node %s', data, exc_info=True) return False def get_broadcast_interfaces(): return list(set( addr['addr'] for iface in netifaces.interfaces() for addr in netifaces.ifaddresses(iface).get(socket.AF_INET, []) if addr.get('netmask') != '255.255.255.255' and addr.get('broadcast') )) class LocalNodes(dict): service_type = '_oml._tcp.local.' local_info = None local_ips = None def __init__(self): if not settings.server.get('localnode_discovery'): return self.setup() self._ip_changed = PeriodicCallback(self._update_if_ip_changed, 60000) def setup(self): self.local_ips = get_broadcast_interfaces() self.zeroconf = {ip: Zeroconf(interfaces=[ip]) for ip in self.local_ips} self.register_service() self.browse() def _update_if_ip_changed(self): local_ips = get_broadcast_interfaces() username = settings.preferences.get('username', 'anonymous') if local_ips != self.local_ips or self.username != username: self.close() self.setup() def browse(self): self.browser = { ip: ServiceBrowser(self.zeroconf[ip], self.service_type, handlers=[self.on_service_state_change]) for ip in self.zeroconf } def register_service(self): if self.local_info: for local_ip, local_info in self.local_info: self.zeroconf[local_ip].unregister_service(local_info) self.local_info = None local_name = socket.gethostname().partition('.')[0] + '.local.' port = settings.server['node_port'] self.username = settings.preferences.get('username', 'anonymous') desc = { 'username': self.username } self.local_info = [] for i, local_ip in enumerate(get_broadcast_interfaces()): if i: name = '%s-%s [%s].%s' % (desc['username'], i+1, settings.USER_ID, self.service_type) else: name = '%s [%s].%s' % (desc['username'], settings.USER_ID, self.service_type) local_info = ServiceInfo(self.service_type, name, socket.inet_aton(local_ip), port, 0, 0, desc, local_name) self.zeroconf[local_ip].register_service(local_info) self.local_info.append((local_ip, local_info)) def __del__(self): self.close() def close(self): if self.local_info: for local_ip, local_info in self.local_info: try: self.zeroconf[local_ip].unregister_service(local_info) except: logger.debug('exception closing zeroconf', exc_info=True) self.local_info = None if self.zeroconf: for local_ip in self.zeroconf: try: self.zeroconf[local_ip].close() except: logger.debug('exception closing zeroconf', exc_info=True) self.zeroconf = None for id in list(self): self.pop(id, None) def on_service_state_change(self, zeroconf, service_type, name, state_change): if '[' not in name: id = name.split('.')[0] else: id = name.split('[')[1].split(']')[0] if id == settings.USER_ID: return if state_change is ServiceStateChange.Added: info = zeroconf.get_service_info(service_type, name) if info: self[id] = { 'id': id, 'host': socket.inet_ntoa(info.address), 'port': info.port } if info.properties: for key, value in info.properties.items(): key = key.decode() self[id][key] = value.decode() logger.debug('add: %s [%s] (%s:%s)', self[id].get('username', 'anon'), id, self[id]['host'], self[id]['port']) if state.tasks and id in self: state.tasks.queue('addlocalinfo', self[id]) elif state_change is ServiceStateChange.Removed: logger.debug('remove: %s', id) self.pop(id, None) if state.tasks: state.tasks.queue('removelocalinfo', id) def get_data(self, user_id): data = self.get(user_id) if data and can_connect(data): return data return None