449 lines
13 KiB
Python
449 lines
13 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.errors import AuthError, FederationError
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from synapse.api.events.room import 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.util.async import run_on_reactor
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from twisted.internet import defer
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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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# When joining a room we need to queue any events for that room up
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self.room_queues = {}
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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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yield run_on_reactor()
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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, state=None):
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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 through the StateHandler.
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"""
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event = self.pdu_codec.event_from_pdu(pdu)
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logger.debug("Got event: %s", event.event_id)
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if event.room_id in self.room_queues:
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self.room_queues[event.room_id].append(pdu)
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return
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logger.debug("Processing event: %s", event.event_id)
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if state:
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state = [self.pdu_codec.event_from_pdu(p) for p in state]
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is_new_state = yield self.state_handler.annotate_state_groups(
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event,
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old_state=state
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)
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logger.debug("Event: %s", event)
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try:
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yield self.auth.check(event, None, raises=True)
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except AuthError as e:
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raise FederationError(
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"ERROR",
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e.code,
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e.msg,
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affected=event.event_id,
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)
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is_new_state = is_new_state and not backfilled
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# TODO: Implement something in federation that allows us to
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# respond to PDU.
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with (yield self.room_lock.lock(event.room_id)):
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yield self.store.persist_event(
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event,
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backfilled,
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is_new_state=is_new_state
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)
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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, event.event_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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extra_users = []
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if event.type == RoomMemberEvent.TYPE:
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target_user_id = event.state_key
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target_user = self.hs.parse_userid(target_user_id)
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extra_users.append(target_user)
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yield self.notifier.on_new_room_event(
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event, extra_users=extra_users
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)
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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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extremities = yield self.store.get_oldest_events_in_room(room_id)
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pdus = yield self.replication_layer.backfill(
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dest,
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room_id,
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limit,
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extremities=[
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self.pdu_codec.decode_event_id(e)
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for e in extremities
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]
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)
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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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# FIXME (erikj): Not sure this actually works :/
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yield self.state_handler.annotate_state_groups(event)
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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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pdu = yield self.replication_layer.make_join(
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target_host,
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room_id,
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joinee
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)
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logger.debug("Got response to make_join: %s", pdu)
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event = self.pdu_codec.event_from_pdu(pdu)
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# We should assert some things.
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assert(event.type == RoomMemberEvent.TYPE)
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assert(event.user_id == joinee)
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assert(event.state_key == joinee)
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assert(event.room_id == room_id)
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event.outlier = False
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self.room_queues[room_id] = []
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try:
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event.event_id = self.event_factory.create_event_id()
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event.content = content
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state = yield self.replication_layer.send_join(
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target_host,
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self.pdu_codec.pdu_from_event(event)
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)
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state = [self.pdu_codec.event_from_pdu(p) for p in state]
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logger.debug("do_invite_join state: %s", state)
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is_new_state = yield self.state_handler.annotate_state_groups(
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event,
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old_state=state
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)
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logger.debug("do_invite_join event: %s", event)
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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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# FIXME
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pass
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for e in state:
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# FIXME: Auth these.
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e.outlier = True
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yield self.state_handler.annotate_state_groups(
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e,
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)
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yield self.store.persist_event(
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e,
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backfilled=False,
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is_new_state=False
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)
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yield self.store.persist_event(
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event,
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backfilled=False,
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is_new_state=is_new_state
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)
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finally:
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room_queue = self.room_queues[room_id]
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del self.room_queues[room_id]
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for p in room_queue:
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try:
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yield self.on_receive_pdu(p, backfilled=False)
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except:
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pass
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defer.returnValue(True)
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@defer.inlineCallbacks
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@log_function
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def on_make_join_request(self, context, user_id):
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event = self.event_factory.create_event(
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etype=RoomMemberEvent.TYPE,
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content={"membership": Membership.JOIN},
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room_id=context,
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user_id=user_id,
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state_key=user_id,
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)
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snapshot = yield self.store.snapshot_room(
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event.room_id, event.user_id,
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)
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snapshot.fill_out_prev_events(event)
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yield self.state_handler.annotate_state_groups(event)
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yield self.auth.check(event, None, raises=True)
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pdu = self.pdu_codec.pdu_from_event(event)
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defer.returnValue(pdu)
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@defer.inlineCallbacks
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@log_function
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def on_send_join_request(self, origin, pdu):
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event = self.pdu_codec.event_from_pdu(pdu)
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event.outlier = False
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is_new_state = yield self.state_handler.annotate_state_groups(event)
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yield self.auth.check(event, None, raises=True)
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# FIXME (erikj): All this is duplicated above :(
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yield self.store.persist_event(
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event,
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backfilled=False,
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is_new_state=is_new_state
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)
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extra_users = []
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if event.type == RoomMemberEvent.TYPE:
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target_user_id = event.state_key
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target_user = self.hs.parse_userid(target_user_id)
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extra_users.append(target_user)
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yield self.notifier.on_new_room_event(
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event, extra_users=extra_users
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)
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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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new_pdu = self.pdu_codec.pdu_from_event(event);
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new_pdu.destinations = yield self.store.get_joined_hosts_for_room(
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event.room_id
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)
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yield self.replication_layer.send_pdu(new_pdu)
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defer.returnValue([
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self.pdu_codec.pdu_from_event(e)
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for e in event.state_events.values()
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])
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@defer.inlineCallbacks
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def get_state_for_pdu(self, event_id):
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yield run_on_reactor()
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state_groups = yield self.store.get_state_groups(
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[event_id]
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)
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if state_groups:
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results = {
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(e.type, e.state_key): e for e in state_groups[0].state
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}
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event = yield self.store.get_event(event_id)
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if hasattr(event, "state_key"):
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# Get previous state
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if hasattr(event, "prev_state") and event.prev_state:
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prev_event = yield self.store.get_event(event.prev_state)
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results[(event.type, event.state_key)] = prev_event
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else:
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del results[(event.type, event.state_key)]
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defer.returnValue(
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[
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self.pdu_codec.pdu_from_event(s)
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for s in results.values()
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]
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)
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else:
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defer.returnValue([])
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@defer.inlineCallbacks
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@log_function
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def on_backfill_request(self, context, pdu_list, limit):
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events = yield self.store.get_backfill_events(
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context,
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pdu_list,
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limit
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)
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defer.returnValue([
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self.pdu_codec.pdu_from_event(e)
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for e in events
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])
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@defer.inlineCallbacks
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@log_function
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def get_persisted_pdu(self, event_id):
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""" Get a PDU from the database with given origin and id.
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Returns:
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Deferred: Results in a `Pdu`.
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"""
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event = yield self.store.get_event(
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event_id,
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allow_none=True,
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)
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if event:
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defer.returnValue(self.pdu_codec.pdu_from_event(event))
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else:
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defer.returnValue(None)
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@log_function
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def get_min_depth_for_context(self, context):
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return self.store.get_min_depth(context)
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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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