260 lines
8.6 KiB
Python
260 lines
8.6 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Contains handlers for federation events."""
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from ._base import BaseHandler
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from synapse.api.events.room import InviteJoinEvent, RoomMemberEvent
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from synapse.api.constants import Membership
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from synapse.util.logutils import log_function
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from synapse.federation.pdu_codec import PduCodec
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from synapse.api.errors import SynapseError
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from twisted.internet import defer, reactor
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import logging
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logger = logging.getLogger(__name__)
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class FederationHandler(BaseHandler):
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"""Handles events that originated from federation.
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Responsible for:
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a) handling received Pdus before handing them on as Events to the rest
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of the home server (including auth and state conflict resoultion)
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b) converting events that were produced by local clients that may need
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to be sent to remote home servers.
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"""
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def __init__(self, hs):
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super(FederationHandler, self).__init__(hs)
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self.distributor.observe(
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"user_joined_room",
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self._on_user_joined
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)
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self.waiting_for_join_list = {}
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self.store = hs.get_datastore()
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self.replication_layer = hs.get_replication_layer()
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self.state_handler = hs.get_state_handler()
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# self.auth_handler = gs.get_auth_handler()
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self.server_name = hs.hostname
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self.lock_manager = hs.get_room_lock_manager()
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self.replication_layer.set_handler(self)
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self.pdu_codec = PduCodec(hs)
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@log_function
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@defer.inlineCallbacks
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def handle_new_event(self, event, snapshot):
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""" Takes in an event from the client to server side, that has already
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been authed and handled by the state module, and sends it to any
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remote home servers that may be interested.
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Args:
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event
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snapshot (.storage.Snapshot): THe snapshot the event happened after
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Returns:
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Deferred: Resolved when it has successfully been queued for
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processing.
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"""
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pdu = self.pdu_codec.pdu_from_event(event)
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if not hasattr(pdu, "destinations") or not pdu.destinations:
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pdu.destinations = []
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yield self.replication_layer.send_pdu(pdu)
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@log_function
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@defer.inlineCallbacks
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def on_receive_pdu(self, pdu, backfilled):
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""" Called by the ReplicationLayer when we have a new pdu. We need to
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do auth checks and put it throught the StateHandler.
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"""
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event = self.pdu_codec.event_from_pdu(pdu)
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with (yield self.lock_manager.lock(pdu.context)):
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if event.is_state and not backfilled:
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is_new_state = yield self.state_handler.handle_new_state(
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pdu
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)
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if not is_new_state:
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return
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else:
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is_new_state = False
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# TODO: Implement something in federation that allows us to
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# respond to PDU.
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if hasattr(event, "state_key") and not is_new_state:
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logger.debug("Ignoring old state.")
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return
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target_is_mine = False
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if hasattr(event, "target_host"):
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target_is_mine = event.target_host == self.hs.hostname
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if event.type == InviteJoinEvent.TYPE:
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if not target_is_mine:
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logger.debug("Ignoring invite/join event %s", event)
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return
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# If we receive an invite/join event then we need to join the
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# sender to the given room.
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# TODO: We should probably auth this or some such
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content = event.content
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content.update({"membership": Membership.JOIN})
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new_event = self.event_factory.create_event(
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etype=RoomMemberEvent.TYPE,
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state_key=event.user_id,
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room_id=event.room_id,
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user_id=event.user_id,
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membership=Membership.JOIN,
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content=content
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)
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yield self.hs.get_handlers().room_member_handler.change_membership(
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new_event,
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do_auth=False,
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)
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else:
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with (yield self.room_lock.lock(event.room_id)):
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yield self.store.persist_event(event, backfilled)
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room = yield self.store.get_room(event.room_id)
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if not room:
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# Huh, let's try and get the current state
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try:
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yield self.replication_layer.get_state_for_context(
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event.origin, event.room_id
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)
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hosts = yield self.store.get_joined_hosts_for_room(
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event.room_id
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)
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if self.hs.hostname in hosts:
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try:
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yield self.store.store_room(
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room_id=event.room_id,
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room_creator_user_id="",
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is_public=False,
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)
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except:
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pass
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except:
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logger.exception(
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"Failed to get current state for room %s",
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event.room_id
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)
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if not backfilled:
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yield self.notifier.on_new_room_event(event)
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if event.type == RoomMemberEvent.TYPE:
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if event.membership == Membership.JOIN:
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user = self.hs.parse_userid(event.state_key)
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self.distributor.fire(
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"user_joined_room", user=user, room_id=event.room_id
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)
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@log_function
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@defer.inlineCallbacks
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def backfill(self, dest, room_id, limit):
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pdus = yield self.replication_layer.backfill(dest, room_id, limit)
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events = []
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for pdu in pdus:
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event = self.pdu_codec.event_from_pdu(pdu)
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events.append(event)
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yield self.store.persist_event(event, backfilled=True)
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defer.returnValue(events)
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@log_function
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@defer.inlineCallbacks
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def do_invite_join(self, target_host, room_id, joinee, content, snapshot):
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hosts = yield self.store.get_joined_hosts_for_room(room_id)
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if self.hs.hostname in hosts:
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# We are already in the room.
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logger.debug("We're already in the room apparently")
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defer.returnValue(False)
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# First get current state to see if we are already joined.
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try:
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yield self.replication_layer.get_state_for_context(
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target_host, room_id
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)
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hosts = yield self.store.get_joined_hosts_for_room(room_id)
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if self.hs.hostname in hosts:
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# Oh, we were actually in the room already.
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logger.debug("We're already in the room apparently")
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defer.returnValue(False)
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except Exception:
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logger.exception("Failed to get current state")
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new_event = self.event_factory.create_event(
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etype=InviteJoinEvent.TYPE,
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target_host=target_host,
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room_id=room_id,
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user_id=joinee,
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content=content
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)
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new_event.destinations = [target_host]
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snapshot.fill_out_prev_events(new_event)
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yield self.handle_new_event(new_event, snapshot)
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# TODO (erikj): Time out here.
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d = defer.Deferred()
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self.waiting_for_join_list.setdefault((joinee, room_id), []).append(d)
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reactor.callLater(10, d.cancel)
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try:
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yield d
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except defer.CancelledError:
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raise SynapseError(500, "Unable to join remote room")
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try:
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yield self.store.store_room(
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room_id=room_id,
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room_creator_user_id="",
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is_public=False
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)
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except:
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pass
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defer.returnValue(True)
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@log_function
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def _on_user_joined(self, user, room_id):
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waiters = self.waiting_for_join_list.get((user.to_string(), room_id), [])
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while waiters:
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waiters.pop().callback(None)
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