# -*- coding: utf-8 -*- # Copyright 2014 OpenMarket Ltd # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. """Contains handlers for federation events.""" from ._base import BaseHandler from synapse.api.events.room import InviteJoinEvent, RoomMemberEvent from synapse.api.constants import Membership from synapse.util.logutils import log_function from synapse.federation.pdu_codec import PduCodec from twisted.internet import defer, reactor import logging logger = logging.getLogger(__name__) class FederationHandler(BaseHandler): """Handles events that originated from federation. Responsible for: a) handling received Pdus before handing them on as Events to the rest of the home server (including auth and state conflict resoultion) b) converting events that were produced by local clients that may need to be sent to remote home servers. """ def __init__(self, hs): super(FederationHandler, self).__init__(hs) self.distributor.observe( "user_joined_room", self._on_user_joined ) self.waiting_for_join_list = {} self.store = hs.get_datastore() self.replication_layer = hs.get_replication_layer() self.state_handler = hs.get_state_handler() # self.auth_handler = gs.get_auth_handler() self.server_name = hs.hostname self.lock_manager = hs.get_room_lock_manager() self.replication_layer.set_handler(self) self.pdu_codec = PduCodec(hs) @log_function @defer.inlineCallbacks def handle_new_event(self, event, snapshot): """ Takes in an event from the client to server side, that has already been authed and handled by the state module, and sends it to any remote home servers that may be interested. Args: event snapshot (.storage.Snapshot): THe snapshot the event happened after Returns: Deferred: Resolved when it has successfully been queued for processing. """ pdu = self.pdu_codec.pdu_from_event(event) if not hasattr(pdu, "destinations") or not pdu.destinations: pdu.destinations = [] yield self.replication_layer.send_pdu(pdu) @log_function @defer.inlineCallbacks def on_receive_pdu(self, pdu, backfilled): """ Called by the ReplicationLayer when we have a new pdu. We need to do auth checks and put it throught the StateHandler. """ event = self.pdu_codec.event_from_pdu(pdu) with (yield self.lock_manager.lock(pdu.context)): if event.is_state and not backfilled: is_new_state = yield self.state_handler.handle_new_state( pdu ) if not is_new_state: return else: is_new_state = False # TODO: Implement something in federation that allows us to # respond to PDU. if hasattr(event, "state_key") and not is_new_state: logger.debug("Ignoring old state.") return target_is_mine = False if hasattr(event, "target_host"): target_is_mine = event.target_host == self.hs.hostname if event.type == InviteJoinEvent.TYPE: if not target_is_mine: logger.debug("Ignoring invite/join event %s", event) return # If we receive an invite/join event then we need to join the # sender to the given room. # TODO: We should probably auth this or some such content = event.content content.update({"membership": Membership.JOIN}) new_event = self.event_factory.create_event( etype=RoomMemberEvent.TYPE, state_key=event.user_id, room_id=event.room_id, user_id=event.user_id, membership=Membership.JOIN, content=content ) yield self.hs.get_handlers().room_member_handler.change_membership( new_event, do_auth=False, ) else: with (yield self.room_lock.lock(event.room_id)): yield self.store.persist_event(event, backfilled) room = yield self.store.get_room(event.room_id) if not room: # Huh, let's try and get the current state try: yield self.replication_layer.get_state_for_context( event.origin, event.room_id ) hosts = yield self.store.get_joined_hosts_for_room( event.room_id ) if self.hs.hostname in hosts: try: yield self.store.store_room( room_id=event.room_id, room_creator_user_id="", is_public=False, ) except: pass except: logger.exception( "Failed to get current state for room %s", event.room_id ) if not backfilled: yield self.notifier.on_new_room_event(event) if event.type == RoomMemberEvent.TYPE: if event.membership == Membership.JOIN: user = self.hs.parse_userid(event.state_key) self.distributor.fire( "user_joined_room", user=user, room_id=event.room_id ) @log_function @defer.inlineCallbacks def backfill(self, dest, room_id, limit): pdus = yield self.replication_layer.backfill(dest, room_id, limit) events = [] for pdu in pdus: event = self.pdu_codec.event_from_pdu(pdu) events.append(event) yield self.store.persist_event(event, backfilled=True) defer.returnValue(events) @log_function @defer.inlineCallbacks def do_invite_join(self, target_host, room_id, joinee, content, snapshot): hosts = yield self.store.get_joined_hosts_for_room(room_id) if self.hs.hostname in hosts: # We are already in the room. logger.debug("We're already in the room apparently") defer.returnValue(False) # First get current state to see if we are already joined. try: yield self.replication_layer.get_state_for_context( target_host, room_id ) hosts = yield self.store.get_joined_hosts_for_room(room_id) if self.hs.hostname in hosts: # Oh, we were actually in the room already. logger.debug("We're already in the room apparently") defer.returnValue(False) except Exception: logger.exception("Failed to get current state") new_event = self.event_factory.create_event( etype=InviteJoinEvent.TYPE, target_host=target_host, room_id=room_id, user_id=joinee, content=content ) new_event.destinations = [target_host] snapshot.fill_out_prev_events(new_event) yield self.handle_new_event(new_event, snapshot) # TODO (erikj): Time out here. d = defer.Deferred() self.waiting_for_join_list.setdefault((joinee, room_id), []).append(d) reactor.callLater(10, d.cancel) yield d try: yield self.store.store_room( room_id=room_id, room_creator_user_id="", is_public=False ) except: pass defer.returnValue(True) @log_function def _on_user_joined(self, user, room_id): waiters = self.waiting_for_join_list.get((user.to_string(), room_id), []) while waiters: waiters.pop().callback(None)