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![Erik Johnston](/assets/img/avatar_default.png)
If no `from` param is specified we calculate and use the "current token" that inlcuded typing, presence, etc. These are unused during pagination and are not available on workers, so we simply don't calculate them.
290 lines
9.8 KiB
Python
290 lines
9.8 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014 - 2016 OpenMarket Ltd
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# Copyright 2017 - 2018 New Vector 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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import logging
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from twisted.internet import defer
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from twisted.python.failure import Failure
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from synapse.api.constants import EventTypes, Membership
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from synapse.api.errors import SynapseError
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from synapse.storage.state import StateFilter
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from synapse.types import RoomStreamToken
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from synapse.util.async_helpers import ReadWriteLock
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from synapse.util.logcontext import run_in_background
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from synapse.util.stringutils import random_string
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from synapse.visibility import filter_events_for_client
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logger = logging.getLogger(__name__)
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class PurgeStatus(object):
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"""Object tracking the status of a purge request
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This class contains information on the progress of a purge request, for
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return by get_purge_status.
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Attributes:
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status (int): Tracks whether this request has completed. One of
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STATUS_{ACTIVE,COMPLETE,FAILED}
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"""
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STATUS_ACTIVE = 0
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STATUS_COMPLETE = 1
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STATUS_FAILED = 2
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STATUS_TEXT = {
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STATUS_ACTIVE: "active",
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STATUS_COMPLETE: "complete",
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STATUS_FAILED: "failed",
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}
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def __init__(self):
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self.status = PurgeStatus.STATUS_ACTIVE
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def asdict(self):
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return {"status": PurgeStatus.STATUS_TEXT[self.status]}
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class PaginationHandler(object):
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"""Handles pagination and purge history requests.
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These are in the same handler due to the fact we need to block clients
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paginating during a purge.
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"""
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def __init__(self, hs):
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self.hs = hs
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self.auth = hs.get_auth()
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self.store = hs.get_datastore()
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self.clock = hs.get_clock()
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self.pagination_lock = ReadWriteLock()
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self._purges_in_progress_by_room = set()
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# map from purge id to PurgeStatus
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self._purges_by_id = {}
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self._event_serializer = hs.get_event_client_serializer()
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def start_purge_history(self, room_id, token, delete_local_events=False):
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"""Start off a history purge on a room.
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Args:
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room_id (str): The room to purge from
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token (str): topological token to delete events before
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delete_local_events (bool): True to delete local events as well as
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remote ones
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Returns:
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str: unique ID for this purge transaction.
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"""
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if room_id in self._purges_in_progress_by_room:
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raise SynapseError(
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400, "History purge already in progress for %s" % (room_id,)
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)
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purge_id = random_string(16)
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# we log the purge_id here so that it can be tied back to the
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# request id in the log lines.
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logger.info("[purge] starting purge_id %s", purge_id)
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self._purges_by_id[purge_id] = PurgeStatus()
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run_in_background(
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self._purge_history, purge_id, room_id, token, delete_local_events
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)
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return purge_id
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@defer.inlineCallbacks
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def _purge_history(self, purge_id, room_id, token, delete_local_events):
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"""Carry out a history purge on a room.
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Args:
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purge_id (str): The id for this purge
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room_id (str): The room to purge from
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token (str): topological token to delete events before
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delete_local_events (bool): True to delete local events as well as
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remote ones
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Returns:
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Deferred
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"""
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self._purges_in_progress_by_room.add(room_id)
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try:
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with (yield self.pagination_lock.write(room_id)):
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yield self.store.purge_history(room_id, token, delete_local_events)
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logger.info("[purge] complete")
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self._purges_by_id[purge_id].status = PurgeStatus.STATUS_COMPLETE
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except Exception:
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f = Failure()
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logger.error(
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"[purge] failed", exc_info=(f.type, f.value, f.getTracebackObject())
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)
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self._purges_by_id[purge_id].status = PurgeStatus.STATUS_FAILED
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finally:
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self._purges_in_progress_by_room.discard(room_id)
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# remove the purge from the list 24 hours after it completes
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def clear_purge():
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del self._purges_by_id[purge_id]
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self.hs.get_reactor().callLater(24 * 3600, clear_purge)
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def get_purge_status(self, purge_id):
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"""Get the current status of an active purge
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Args:
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purge_id (str): purge_id returned by start_purge_history
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Returns:
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PurgeStatus|None
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"""
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return self._purges_by_id.get(purge_id)
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@defer.inlineCallbacks
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def get_messages(
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self,
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requester,
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room_id=None,
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pagin_config=None,
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as_client_event=True,
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event_filter=None,
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):
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"""Get messages in a room.
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Args:
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requester (Requester): The user requesting messages.
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room_id (str): The room they want messages from.
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pagin_config (synapse.api.streams.PaginationConfig): The pagination
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config rules to apply, if any.
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as_client_event (bool): True to get events in client-server format.
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event_filter (Filter): Filter to apply to results or None
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Returns:
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dict: Pagination API results
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"""
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user_id = requester.user.to_string()
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if pagin_config.from_token:
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room_token = pagin_config.from_token.room_key
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else:
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pagin_config.from_token = (
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yield self.hs.get_event_sources().get_current_token_for_pagination()
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)
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room_token = pagin_config.from_token.room_key
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room_token = RoomStreamToken.parse(room_token)
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pagin_config.from_token = pagin_config.from_token.copy_and_replace(
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"room_key", str(room_token)
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)
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source_config = pagin_config.get_source_config("room")
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with (yield self.pagination_lock.read(room_id)):
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membership, member_event_id = yield self.auth.check_in_room_or_world_readable(
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room_id, user_id
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)
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if source_config.direction == "b":
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# if we're going backwards, we might need to backfill. This
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# requires that we have a topo token.
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if room_token.topological:
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max_topo = room_token.topological
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else:
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max_topo = yield self.store.get_max_topological_token(
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room_id, room_token.stream
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)
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if membership == Membership.LEAVE:
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# If they have left the room then clamp the token to be before
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# they left the room, to save the effort of loading from the
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# database.
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leave_token = yield self.store.get_topological_token_for_event(
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member_event_id
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)
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leave_token = RoomStreamToken.parse(leave_token)
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if leave_token.topological < max_topo:
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source_config.from_key = str(leave_token)
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yield self.hs.get_handlers().federation_handler.maybe_backfill(
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room_id, max_topo
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)
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events, next_key = yield self.store.paginate_room_events(
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room_id=room_id,
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from_key=source_config.from_key,
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to_key=source_config.to_key,
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direction=source_config.direction,
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limit=source_config.limit,
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event_filter=event_filter,
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)
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next_token = pagin_config.from_token.copy_and_replace("room_key", next_key)
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if events:
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if event_filter:
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events = event_filter.filter(events)
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events = yield filter_events_for_client(
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self.store, user_id, events, is_peeking=(member_event_id is None)
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)
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if not events:
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defer.returnValue(
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{
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"chunk": [],
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"start": pagin_config.from_token.to_string(),
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"end": next_token.to_string(),
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}
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)
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state = None
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if event_filter and event_filter.lazy_load_members() and len(events) > 0:
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# TODO: remove redundant members
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# FIXME: we also care about invite targets etc.
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state_filter = StateFilter.from_types(
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(EventTypes.Member, event.sender) for event in events
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)
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state_ids = yield self.store.get_state_ids_for_event(
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events[0].event_id, state_filter=state_filter
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)
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if state_ids:
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state = yield self.store.get_events(list(state_ids.values()))
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state = state.values()
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time_now = self.clock.time_msec()
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chunk = {
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"chunk": (
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yield self._event_serializer.serialize_events(
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events, time_now, as_client_event=as_client_event
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)
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),
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"start": pagin_config.from_token.to_string(),
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"end": next_token.to_string(),
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}
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if state:
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chunk["state"] = (
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yield self._event_serializer.serialize_events(
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state, time_now, as_client_event=as_client_event
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)
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)
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defer.returnValue(chunk)
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