158 lines
4.7 KiB
Python
158 lines
4.7 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 matrix.org
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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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from twisted.internet import defer
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from .pdu_codec import PduCodec
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from synapse.api.errors import AuthError
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from synapse.util.logutils import log_function
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import logging
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logger = logging.getLogger(__name__)
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class FederationEventHandler(object):
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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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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.event_handler = hs.get_handlers().federation_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):
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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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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 self.fill_out_prev_events(event)
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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 backfill(self, dest, room_id, limit):
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pdus = yield self.replication_layer.backfill(dest, room_id, limit)
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if not pdus:
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defer.returnValue([])
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events = [
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self.pdu_codec.event_from_pdu(pdu)
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for pdu in pdus
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]
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defer.returnValue(events)
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@log_function
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def get_state_for_room(self, destination, room_id):
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return self.replication_layer.get_state_for_context(
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destination, room_id
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)
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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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try:
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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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yield self.event_handler.on_receive(event, is_new_state, backfilled)
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except AuthError:
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# TODO: Implement something in federation that allows us to
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# respond to PDU.
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raise
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return
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@defer.inlineCallbacks
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def _on_new_state(self, pdu, new_state_event):
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# TODO: Do any store stuff here. Notifiy C2S about this new
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# state.
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yield self.store.update_current_state(
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pdu_id=pdu.pdu_id,
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origin=pdu.origin,
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context=pdu.context,
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pdu_type=pdu.pdu_type,
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state_key=pdu.state_key
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)
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yield self.event_handler.on_receive(new_state_event)
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@defer.inlineCallbacks
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def fill_out_prev_events(self, event):
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if hasattr(event, "prev_events"):
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return
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results = yield self.store.get_latest_pdus_in_context(
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event.room_id
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)
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es = [
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"%s@%s" % (p_id, origin) for p_id, origin, _ in results
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]
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event.prev_events = [e for e in es if e != event.event_id]
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if results:
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event.depth = max([int(v) for _, _, v in results]) + 1
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else:
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event.depth = 0
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