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# -*- 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 synapse.api.errors import SynapseError
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)
logger.debug("Got event: %s", event.event_id)
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: %s", event.event_id)
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)
try:
yield d
except defer.CancelledError:
raise SynapseError(500, "Unable to join remote room")
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)
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