440 lines
16 KiB
Python
440 lines
16 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015 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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from ._base import BaseHandler
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from synapse.streams.config import PaginationConfig
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from synapse.api.constants import Membership, EventTypes
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from twisted.internet import defer
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import collections
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import logging
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logger = logging.getLogger(__name__)
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SyncConfig = collections.namedtuple("SyncConfig", [
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"user",
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"client_info",
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"limit",
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"gap",
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"sort",
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"backfill",
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"filter",
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])
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class RoomSyncResult(collections.namedtuple("RoomSyncResult", [
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"room_id",
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"limited",
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"published",
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"events",
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"state",
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"prev_batch",
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"ephemeral",
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])):
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__slots__ = []
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def __nonzero__(self):
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"""Make the result appear empty if there are no updates. This is used
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to tell if room needs to be part of the sync result.
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"""
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return bool(self.events or self.state or self.ephemeral)
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class SyncResult(collections.namedtuple("SyncResult", [
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"next_batch", # Token for the next sync
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"private_user_data", # List of private events for the user.
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"public_user_data", # List of public events for all users.
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"rooms", # RoomSyncResult for each room.
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])):
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__slots__ = []
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def __nonzero__(self):
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"""Make the result appear empty if there are no updates. This is used
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to tell if the notifier needs to wait for more events when polling for
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events.
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"""
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return bool(
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self.private_user_data or self.public_user_data or self.rooms
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)
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class SyncHandler(BaseHandler):
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def __init__(self, hs):
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super(SyncHandler, self).__init__(hs)
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self.event_sources = hs.get_event_sources()
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self.clock = hs.get_clock()
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@defer.inlineCallbacks
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def wait_for_sync_for_user(self, sync_config, since_token=None, timeout=0):
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"""Get the sync for a client if we have new data for it now. Otherwise
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wait for new data to arrive on the server. If the timeout expires, then
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return an empty sync result.
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Returns:
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A Deferred SyncResult.
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"""
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if timeout == 0 or since_token is None:
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result = yield self.current_sync_for_user(sync_config, since_token)
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defer.returnValue(result)
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else:
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def current_sync_callback():
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return self.current_sync_for_user(sync_config, since_token)
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rm_handler = self.hs.get_handlers().room_member_handler
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room_ids = yield rm_handler.get_rooms_for_user(sync_config.user)
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result = yield self.notifier.wait_for_events(
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sync_config.user, room_ids,
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sync_config.filter, timeout, current_sync_callback
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)
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defer.returnValue(result)
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def current_sync_for_user(self, sync_config, since_token=None):
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"""Get the sync for client needed to match what the server has now.
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Returns:
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A Deferred SyncResult.
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"""
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if since_token is None:
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return self.initial_sync(sync_config)
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else:
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if sync_config.gap:
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return self.incremental_sync_with_gap(sync_config, since_token)
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else:
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# TODO(mjark): Handle gapless sync
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raise NotImplementedError()
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@defer.inlineCallbacks
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def initial_sync(self, sync_config):
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"""Get a sync for a client which is starting without any state
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Returns:
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A Deferred SyncResult.
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"""
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if sync_config.sort == "timeline,desc":
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# TODO(mjark): Handle going through events in reverse order?.
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# What does "most recent events" mean when applying the limits mean
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# in this case?
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raise NotImplementedError()
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now_token = yield self.event_sources.get_current_token()
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presence_stream = self.event_sources.sources["presence"]
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# TODO (mjark): This looks wrong, shouldn't we be getting the presence
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# UP to the present rather than after the present?
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pagination_config = PaginationConfig(from_token=now_token)
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presence, _ = yield presence_stream.get_pagination_rows(
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user=sync_config.user,
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pagination_config=pagination_config.get_source_config("presence"),
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key=None
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)
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room_list = yield self.store.get_rooms_for_user_where_membership_is(
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user_id=sync_config.user.to_string(),
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membership_list=[Membership.INVITE, Membership.JOIN]
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)
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# TODO (mjark): Does public mean "published"?
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published_rooms = yield self.store.get_rooms(is_public=True)
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published_room_ids = set(r["room_id"] for r in published_rooms)
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rooms = []
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for event in room_list:
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room_sync = yield self.initial_sync_for_room(
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event.room_id, sync_config, now_token, published_room_ids
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)
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rooms.append(room_sync)
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defer.returnValue(SyncResult(
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public_user_data=presence,
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private_user_data=[],
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rooms=rooms,
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next_batch=now_token,
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))
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@defer.inlineCallbacks
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def initial_sync_for_room(self, room_id, sync_config, now_token,
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published_room_ids):
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"""Sync a room for a client which is starting without any state
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Returns:
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A Deferred RoomSyncResult.
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"""
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recents, prev_batch_token, limited = yield self.load_filtered_recents(
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room_id, sync_config, now_token,
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)
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current_state = yield self.state_handler.get_current_state(
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room_id
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)
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current_state_events = current_state.values()
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defer.returnValue(RoomSyncResult(
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room_id=room_id,
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published=room_id in published_room_ids,
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events=recents,
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prev_batch=prev_batch_token,
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state=current_state_events,
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limited=limited,
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ephemeral=[],
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))
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@defer.inlineCallbacks
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def incremental_sync_with_gap(self, sync_config, since_token):
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""" Get the incremental delta needed to bring the client up to
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date with the server.
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Returns:
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A Deferred SyncResult.
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"""
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if sync_config.sort == "timeline,desc":
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# TODO(mjark): Handle going through events in reverse order?.
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# What does "most recent events" mean when applying the limits mean
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# in this case?
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raise NotImplementedError()
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now_token = yield self.event_sources.get_current_token()
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presence_source = self.event_sources.sources["presence"]
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presence, presence_key = yield presence_source.get_new_events_for_user(
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user=sync_config.user,
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from_key=since_token.presence_key,
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limit=sync_config.limit,
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)
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now_token = now_token.copy_and_replace("presence_key", presence_key)
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typing_source = self.event_sources.sources["typing"]
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typing, typing_key = yield typing_source.get_new_events_for_user(
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user=sync_config.user,
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from_key=since_token.typing_key,
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limit=sync_config.limit,
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)
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now_token = now_token.copy_and_replace("typing_key", typing_key)
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typing_by_room = {event["room_id"]: [event] for event in typing}
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for event in typing:
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event.pop("room_id")
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logger.debug("Typing %r", typing_by_room)
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rm_handler = self.hs.get_handlers().room_member_handler
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room_ids = yield rm_handler.get_rooms_for_user(sync_config.user)
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# TODO (mjark): Does public mean "published"?
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published_rooms = yield self.store.get_rooms(is_public=True)
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published_room_ids = set(r["room_id"] for r in published_rooms)
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room_events, _ = yield self.store.get_room_events_stream(
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sync_config.user.to_string(),
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from_key=since_token.room_key,
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to_key=now_token.room_key,
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room_id=None,
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limit=sync_config.limit + 1,
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)
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rooms = []
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if len(room_events) <= sync_config.limit:
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# There is no gap in any of the rooms. Therefore we can just
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# partition the new events by room and return them.
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events_by_room_id = {}
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for event in room_events:
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events_by_room_id.setdefault(event.room_id, []).append(event)
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for room_id in room_ids:
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recents = events_by_room_id.get(room_id, [])
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state = [event for event in recents if event.is_state()]
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if recents:
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prev_batch = now_token.copy_and_replace(
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"room_key", recents[0].internal_metadata.before
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)
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else:
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prev_batch = now_token
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state = yield self.check_joined_room(
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sync_config, room_id, state
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)
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room_sync = RoomSyncResult(
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room_id=room_id,
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published=room_id in published_room_ids,
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events=recents,
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prev_batch=prev_batch,
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state=state,
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limited=False,
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ephemeral=typing_by_room.get(room_id, [])
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)
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if room_sync:
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rooms.append(room_sync)
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else:
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for room_id in room_ids:
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room_sync = yield self.incremental_sync_with_gap_for_room(
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room_id, sync_config, since_token, now_token,
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published_room_ids, typing_by_room
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)
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if room_sync:
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rooms.append(room_sync)
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defer.returnValue(SyncResult(
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public_user_data=presence,
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private_user_data=[],
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rooms=rooms,
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next_batch=now_token,
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))
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@defer.inlineCallbacks
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def load_filtered_recents(self, room_id, sync_config, now_token,
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since_token=None):
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limited = True
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recents = []
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filtering_factor = 2
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load_limit = max(sync_config.limit * filtering_factor, 100)
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max_repeat = 3 # Only try a few times per room, otherwise
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room_key = now_token.room_key
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end_key = room_key
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while limited and len(recents) < sync_config.limit and max_repeat:
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events, keys = yield self.store.get_recent_events_for_room(
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room_id,
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limit=load_limit + 1,
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from_token=since_token.room_key if since_token else None,
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end_token=end_key,
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)
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(room_key, _) = keys
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end_key = "s" + room_key.split('-')[-1]
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loaded_recents = sync_config.filter.filter_room_events(events)
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loaded_recents.extend(recents)
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recents = loaded_recents
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if len(events) <= load_limit:
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limited = False
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max_repeat -= 1
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if len(recents) > sync_config.limit:
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recents = recents[-sync_config.limit:]
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room_key = recents[0].internal_metadata.before
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prev_batch_token = now_token.copy_and_replace(
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"room_key", room_key
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)
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defer.returnValue((recents, prev_batch_token, limited))
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@defer.inlineCallbacks
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def incremental_sync_with_gap_for_room(self, room_id, sync_config,
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since_token, now_token,
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published_room_ids, typing_by_room):
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""" Get the incremental delta needed to bring the client up to date for
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the room. Gives the client the most recent events and the changes to
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state.
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Returns:
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A Deferred RoomSyncResult
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"""
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# TODO(mjark): Check for redactions we might have missed.
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recents, prev_batch_token, limited = yield self.load_filtered_recents(
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room_id, sync_config, now_token, since_token,
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)
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logging.debug("Recents %r", recents)
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# TODO(mjark): This seems racy since this isn't being passed a
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# token to indicate what point in the stream this is
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current_state = yield self.state_handler.get_current_state(
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room_id
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)
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current_state_events = current_state.values()
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state_at_previous_sync = yield self.get_state_at_previous_sync(
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room_id, since_token=since_token
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)
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state_events_delta = yield self.compute_state_delta(
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since_token=since_token,
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previous_state=state_at_previous_sync,
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current_state=current_state_events,
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)
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state_events_delta = yield self.check_joined_room(
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sync_config, room_id, state_events_delta
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)
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room_sync = RoomSyncResult(
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room_id=room_id,
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published=room_id in published_room_ids,
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events=recents,
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prev_batch=prev_batch_token,
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state=state_events_delta,
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limited=limited,
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ephemeral=typing_by_room.get(room_id, [])
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)
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logging.debug("Room sync: %r", room_sync)
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defer.returnValue(room_sync)
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@defer.inlineCallbacks
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def get_state_at_previous_sync(self, room_id, since_token):
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""" Get the room state at the previous sync the client made.
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Returns:
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A Deferred list of Events.
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"""
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last_events, token = yield self.store.get_recent_events_for_room(
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room_id, end_token=since_token.room_key, limit=1,
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)
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if last_events:
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last_event = last_events[0]
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last_context = yield self.state_handler.compute_event_context(
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last_event
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)
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if last_event.is_state():
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state = [last_event] + last_context.current_state.values()
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else:
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state = last_context.current_state.values()
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else:
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state = ()
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defer.returnValue(state)
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def compute_state_delta(self, since_token, previous_state, current_state):
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""" Works out the differnce in state between the current state and the
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state the client got when it last performed a sync.
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Returns:
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A list of events.
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"""
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# TODO(mjark) Check if the state events were received by the server
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# after the previous sync, since we need to include those state
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# updates even if they occured logically before the previous event.
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# TODO(mjark) Check for new redactions in the state events.
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previous_dict = {event.event_id: event for event in previous_state}
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state_delta = []
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for event in current_state:
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if event.event_id not in previous_dict:
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state_delta.append(event)
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return state_delta
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@defer.inlineCallbacks
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def check_joined_room(self, sync_config, room_id, state_delta):
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joined = False
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for event in state_delta:
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if (
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event.type == EventTypes.Member
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and event.state_key == sync_config.user.to_string()
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):
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if event.content["membership"] == Membership.JOIN:
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joined = True
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if joined:
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res = yield self.state_handler.get_current_state(room_id)
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state_delta = res.values()
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defer.returnValue(state_delta)
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