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455 lines
17 KiB
Python
455 lines
17 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 typing import TYPE_CHECKING, Any, Dict, Optional, Set
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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.api.filtering import Filter
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from synapse.logging.context import run_in_background
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.storage.state import StateFilter
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from synapse.streams.config import PaginationConfig
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from synapse.types import Requester
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from synapse.util.async_helpers import ReadWriteLock
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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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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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class PurgeStatus:
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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:
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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: "HomeServer"):
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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.storage = hs.get_storage()
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self.state_store = self.storage.state
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self.clock = hs.get_clock()
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self._server_name = hs.hostname
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self.pagination_lock = ReadWriteLock()
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self._purges_in_progress_by_room = set() # type: Set[str]
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# map from purge id to PurgeStatus
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self._purges_by_id = {} # type: Dict[str, PurgeStatus]
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self._event_serializer = hs.get_event_client_serializer()
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self._retention_default_max_lifetime = hs.config.retention_default_max_lifetime
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self._retention_allowed_lifetime_min = hs.config.retention_allowed_lifetime_min
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self._retention_allowed_lifetime_max = hs.config.retention_allowed_lifetime_max
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if hs.config.retention_enabled:
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# Run the purge jobs described in the configuration file.
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for job in hs.config.retention_purge_jobs:
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logger.info("Setting up purge job with config: %s", job)
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self.clock.looping_call(
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run_as_background_process,
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job["interval"],
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"purge_history_for_rooms_in_range",
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self.purge_history_for_rooms_in_range,
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job["shortest_max_lifetime"],
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job["longest_max_lifetime"],
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)
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async def purge_history_for_rooms_in_range(
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self, min_ms: Optional[int], max_ms: Optional[int]
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):
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"""Purge outdated events from rooms within the given retention range.
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If a default retention policy is defined in the server's configuration and its
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'max_lifetime' is within this range, also targets rooms which don't have a
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retention policy.
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Args:
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min_ms: Duration in milliseconds that define the lower limit of
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the range to handle (exclusive). If None, it means that the range has no
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lower limit.
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max_ms: Duration in milliseconds that define the upper limit of
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the range to handle (inclusive). If None, it means that the range has no
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upper limit.
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"""
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# We want the storage layer to include rooms with no retention policy in its
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# return value only if a default retention policy is defined in the server's
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# configuration and that policy's 'max_lifetime' is either lower (or equal) than
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# max_ms or higher than min_ms (or both).
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if self._retention_default_max_lifetime is not None:
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include_null = True
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if min_ms is not None and min_ms >= self._retention_default_max_lifetime:
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# The default max_lifetime is lower than (or equal to) min_ms.
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include_null = False
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if max_ms is not None and max_ms < self._retention_default_max_lifetime:
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# The default max_lifetime is higher than max_ms.
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include_null = False
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else:
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include_null = False
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logger.info(
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"[purge] Running purge job for %s < max_lifetime <= %s (include NULLs = %s)",
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min_ms,
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max_ms,
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include_null,
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)
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rooms = await self.store.get_rooms_for_retention_period_in_range(
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min_ms, max_ms, include_null
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)
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logger.debug("[purge] Rooms to purge: %s", rooms)
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for room_id, retention_policy in rooms.items():
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logger.info("[purge] Attempting to purge messages in room %s", room_id)
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if room_id in self._purges_in_progress_by_room:
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logger.warning(
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"[purge] not purging room %s as there's an ongoing purge running"
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" for this room",
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room_id,
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)
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continue
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# If max_lifetime is None, it means that the room has no retention policy.
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# Given we only retrieve such rooms when there's a default retention policy
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# defined in the server's configuration, we can safely assume that's the
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# case and use it for this room.
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max_lifetime = (
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retention_policy["max_lifetime"] or self._retention_default_max_lifetime
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)
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# Cap the effective max_lifetime to be within the range allowed in the
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# config.
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# We do this in two steps:
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# 1. Make sure it's higher or equal to the minimum allowed value, and if
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# it's not replace it with that value. This is because the server
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# operator can be required to not delete information before a given
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# time, e.g. to comply with freedom of information laws.
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# 2. Make sure the resulting value is lower or equal to the maximum allowed
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# value, and if it's not replace it with that value. This is because the
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# server operator can be required to delete any data after a specific
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# amount of time.
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if self._retention_allowed_lifetime_min is not None:
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max_lifetime = max(self._retention_allowed_lifetime_min, max_lifetime)
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if self._retention_allowed_lifetime_max is not None:
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max_lifetime = min(max_lifetime, self._retention_allowed_lifetime_max)
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logger.debug("[purge] max_lifetime for room %s: %s", room_id, max_lifetime)
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# Figure out what token we should start purging at.
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ts = self.clock.time_msec() - max_lifetime
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stream_ordering = await self.store.find_first_stream_ordering_after_ts(ts)
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r = await self.store.get_room_event_before_stream_ordering(
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room_id, stream_ordering,
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)
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if not r:
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logger.warning(
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"[purge] purging events not possible: No event found "
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"(ts %i => stream_ordering %i)",
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ts,
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stream_ordering,
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)
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continue
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(stream, topo, _event_id) = r
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token = "t%d-%d" % (topo, stream)
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purge_id = random_string(16)
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self._purges_by_id[purge_id] = PurgeStatus()
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logger.info(
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"Starting purging events in room %s (purge_id %s)" % (room_id, purge_id)
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)
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# We want to purge everything, including local events, and to run the purge in
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# the background so that it's not blocking any other operation apart from
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# other purges in the same room.
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run_as_background_process(
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"_purge_history", self._purge_history, purge_id, room_id, token, True,
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)
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def start_purge_history(
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self, room_id: str, token: str, delete_local_events: bool = False
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) -> str:
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"""Start off a history purge on a room.
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Args:
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room_id: The room to purge from
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token: topological token to delete events before
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delete_local_events: True to delete local events as well as
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remote ones
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Returns:
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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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async def _purge_history(
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self, purge_id: str, room_id: str, token: str, delete_local_events: bool
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) -> None:
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"""Carry out a history purge on a room.
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Args:
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purge_id: The id for this purge
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room_id: The room to purge from
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token: topological token to delete events before
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delete_local_events: True to delete local events as well as remote ones
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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 await self.pagination_lock.write(room_id):
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await self.storage.purge_events.purge_history(
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room_id, token, delete_local_events
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)
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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: str) -> Optional[PurgeStatus]:
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"""Get the current status of an active purge
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Args:
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purge_id: purge_id returned by start_purge_history
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"""
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return self._purges_by_id.get(purge_id)
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async def purge_room(self, room_id: str) -> None:
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"""Purge the given room from the database"""
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with await self.pagination_lock.write(room_id):
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# check we know about the room
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await self.store.get_room_version_id(room_id)
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# first check that we have no users in this room
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joined = await self.store.is_host_joined(room_id, self._server_name)
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if joined:
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raise SynapseError(400, "Users are still joined to this room")
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await self.storage.purge_events.purge_room(room_id)
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async def get_messages(
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self,
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requester: Requester,
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room_id: str,
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pagin_config: PaginationConfig,
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as_client_event: bool = True,
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event_filter: Optional[Filter] = None,
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) -> Dict[str, Any]:
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"""Get messages in a room.
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Args:
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requester: The user requesting messages.
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room_id: The room they want messages from.
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pagin_config: The pagination config rules to apply, if any.
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as_client_event: True to get events in client-server format.
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event_filter: Filter to apply to results or None
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Returns:
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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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from_token = pagin_config.from_token
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else:
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from_token = self.hs.get_event_sources().get_current_token_for_pagination()
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if pagin_config.limit is None:
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# This shouldn't happen as we've set a default limit before this
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# gets called.
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raise Exception("limit not set")
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room_token = from_token.room_key
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with await self.pagination_lock.read(room_id):
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(
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membership,
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member_event_id,
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) = await self.auth.check_user_in_room_or_world_readable(
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room_id, user_id, allow_departed_users=True
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)
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if pagin_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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curr_topo = room_token.topological
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else:
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curr_topo = await self.store.get_current_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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# This is only None if the room is world_readable, in which
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# case "JOIN" would have been returned.
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assert member_event_id
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leave_token = await self.store.get_topological_token_for_event(
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member_event_id
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)
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assert leave_token.topological is not None
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if leave_token.topological < curr_topo:
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from_token = from_token.copy_and_replace(
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"room_key", leave_token
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)
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await self.hs.get_federation_handler().maybe_backfill(
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room_id, curr_topo, limit=pagin_config.limit,
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)
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to_room_key = None
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if pagin_config.to_token:
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to_room_key = pagin_config.to_token.room_key
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events, next_key = await self.store.paginate_room_events(
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room_id=room_id,
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from_key=from_token.room_key,
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to_key=to_room_key,
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direction=pagin_config.direction,
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limit=pagin_config.limit,
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event_filter=event_filter,
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)
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next_token = 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 = await filter_events_for_client(
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self.storage, 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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return {
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"chunk": [],
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"start": await from_token.to_string(self.store),
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"end": await next_token.to_string(self.store),
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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 = await self.state_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_dict = await self.store.get_events(list(state_ids.values()))
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state = state_dict.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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await 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": await from_token.to_string(self.store),
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"end": await next_token.to_string(self.store),
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}
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if state:
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chunk["state"] = await 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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return chunk
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