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![Patrick Cloke](/assets/img/avatar_default.png)
This makes the serialization of events synchronous (and it no longer access the database), but we must manually calculate and provide the bundled aggregations. Overall this should cause no change in behavior, but is prep work for other improvements.
752 lines
28 KiB
Python
752 lines
28 KiB
Python
# 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, Collection, Dict, List, Optional, Set
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import attr
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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.handlers.room import ShutdownRoomResponse
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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 JsonDict, 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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@attr.s(slots=True, auto_attribs=True)
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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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"""
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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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# Save the error message if an error occurs
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error: str = ""
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# Tracks whether this request has completed. One of STATUS_{ACTIVE,COMPLETE,FAILED}.
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status: int = STATUS_ACTIVE
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def asdict(self) -> JsonDict:
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ret = {"status": PurgeStatus.STATUS_TEXT[self.status]}
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if self.error:
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ret["error"] = self.error
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return ret
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@attr.s(slots=True, auto_attribs=True)
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class DeleteStatus:
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"""Object tracking the status of a delete room request
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This class contains information on the progress of a delete room request, for
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return by get_delete_status.
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"""
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STATUS_PURGING = 0
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STATUS_COMPLETE = 1
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STATUS_FAILED = 2
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STATUS_SHUTTING_DOWN = 3
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STATUS_TEXT = {
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STATUS_PURGING: "purging",
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STATUS_COMPLETE: "complete",
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STATUS_FAILED: "failed",
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STATUS_SHUTTING_DOWN: "shutting_down",
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}
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# Tracks whether this request has completed.
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# One of STATUS_{PURGING,COMPLETE,FAILED,SHUTTING_DOWN}.
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status: int = STATUS_PURGING
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# Save the error message if an error occurs
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error: str = ""
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# Saves the result of an action to give it back to REST API
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shutdown_room: ShutdownRoomResponse = {
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"kicked_users": [],
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"failed_to_kick_users": [],
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"local_aliases": [],
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"new_room_id": None,
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}
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def asdict(self) -> JsonDict:
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ret = {
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"status": DeleteStatus.STATUS_TEXT[self.status],
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"shutdown_room": self.shutdown_room,
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}
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if self.error:
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ret["error"] = self.error
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return ret
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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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# when to remove a completed deletion/purge from the results map
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CLEAR_PURGE_AFTER_MS = 1000 * 3600 * 24 # 24 hours
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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._room_shutdown_handler = hs.get_room_shutdown_handler()
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self.pagination_lock = ReadWriteLock()
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# IDs of rooms in which there currently an active purge *or delete* operation.
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self._purges_in_progress_by_room: Set[str] = set()
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# map from purge id to PurgeStatus
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self._purges_by_id: Dict[str, PurgeStatus] = {}
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# map from purge id to DeleteStatus
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self._delete_by_id: Dict[str, DeleteStatus] = {}
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# map from room id to delete ids
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# Dict[`room_id`, List[`delete_id`]]
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self._delete_by_room: Dict[str, List[str]] = {}
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self._event_serializer = hs.get_event_client_serializer()
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self._retention_default_max_lifetime = (
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hs.config.retention.retention_default_max_lifetime
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)
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self._retention_allowed_lifetime_min = (
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hs.config.retention.retention_allowed_lifetime_min
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)
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self._retention_allowed_lifetime_max = (
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hs.config.retention.retention_allowed_lifetime_max
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)
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if (
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hs.config.worker.run_background_tasks
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and hs.config.retention.retention_enabled
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):
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# Run the purge jobs described in the configuration file.
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for job in hs.config.retention.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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) -> None:
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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,
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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",
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self._purge_history,
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purge_id,
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room_id,
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token,
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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_as_background_process(
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"purge_history",
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self._purge_history,
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purge_id,
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room_id,
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token,
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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()) # type: ignore
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)
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self._purges_by_id[purge_id].status = PurgeStatus.STATUS_FAILED
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self._purges_by_id[purge_id].error = f.getErrorMessage()
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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() -> None:
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del self._purges_by_id[purge_id]
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self.hs.get_reactor().callLater(
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PaginationHandler.CLEAR_PURGE_AFTER_MS / 1000, clear_purge
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)
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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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def get_delete_status(self, delete_id: str) -> Optional[DeleteStatus]:
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"""Get the current status of an active deleting
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Args:
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delete_id: delete_id returned by start_shutdown_and_purge_room
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"""
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return self._delete_by_id.get(delete_id)
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def get_delete_ids_by_room(self, room_id: str) -> Optional[Collection[str]]:
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"""Get all active delete ids by room
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Args:
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room_id: room_id that is deleted
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"""
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return self._delete_by_room.get(room_id)
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async def purge_room(self, room_id: str, force: bool = False) -> None:
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"""Purge the given room from the database.
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This function is part the delete room v1 API.
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Args:
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room_id: room to be purged
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force: set true to skip checking for joined users.
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"""
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with await self.pagination_lock.write(room_id):
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# first check that we have no users in this room
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if not force:
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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,
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curr_topo,
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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,
|
|
)
|
|
|
|
next_token = from_token.copy_and_replace("room_key", next_key)
|
|
|
|
if events:
|
|
if event_filter:
|
|
events = await event_filter.filter(events)
|
|
|
|
events = await filter_events_for_client(
|
|
self.storage, user_id, events, is_peeking=(member_event_id is None)
|
|
)
|
|
|
|
if not events:
|
|
return {
|
|
"chunk": [],
|
|
"start": await from_token.to_string(self.store),
|
|
"end": await next_token.to_string(self.store),
|
|
}
|
|
|
|
state = None
|
|
if event_filter and event_filter.lazy_load_members and len(events) > 0:
|
|
# TODO: remove redundant members
|
|
|
|
# FIXME: we also care about invite targets etc.
|
|
state_filter = StateFilter.from_types(
|
|
(EventTypes.Member, event.sender) for event in events
|
|
)
|
|
|
|
state_ids = await self.state_store.get_state_ids_for_event(
|
|
events[0].event_id, state_filter=state_filter
|
|
)
|
|
|
|
if state_ids:
|
|
state_dict = await self.store.get_events(list(state_ids.values()))
|
|
state = state_dict.values()
|
|
|
|
aggregations = await self.store.get_bundled_aggregations(events)
|
|
|
|
time_now = self.clock.time_msec()
|
|
|
|
chunk = {
|
|
"chunk": (
|
|
self._event_serializer.serialize_events(
|
|
events,
|
|
time_now,
|
|
bundle_aggregations=aggregations,
|
|
as_client_event=as_client_event,
|
|
)
|
|
),
|
|
"start": await from_token.to_string(self.store),
|
|
"end": await next_token.to_string(self.store),
|
|
}
|
|
|
|
if state:
|
|
chunk["state"] = self._event_serializer.serialize_events(
|
|
state, time_now, as_client_event=as_client_event
|
|
)
|
|
|
|
return chunk
|
|
|
|
async def _shutdown_and_purge_room(
|
|
self,
|
|
delete_id: str,
|
|
room_id: str,
|
|
requester_user_id: str,
|
|
new_room_user_id: Optional[str] = None,
|
|
new_room_name: Optional[str] = None,
|
|
message: Optional[str] = None,
|
|
block: bool = False,
|
|
purge: bool = True,
|
|
force_purge: bool = False,
|
|
) -> None:
|
|
"""
|
|
Shuts down and purges a room.
|
|
|
|
See `RoomShutdownHandler.shutdown_room` for details of creation of the new room
|
|
|
|
Args:
|
|
delete_id: The ID for this delete.
|
|
room_id: The ID of the room to shut down.
|
|
requester_user_id:
|
|
User who requested the action. Will be recorded as putting the room on the
|
|
blocking list.
|
|
new_room_user_id:
|
|
If set, a new room will be created with this user ID
|
|
as the creator and admin, and all users in the old room will be
|
|
moved into that room. If not set, no new room will be created
|
|
and the users will just be removed from the old room.
|
|
new_room_name:
|
|
A string representing the name of the room that new users will
|
|
be invited to. Defaults to `Content Violation Notification`
|
|
message:
|
|
A string containing the first message that will be sent as
|
|
`new_room_user_id` in the new room. Ideally this will clearly
|
|
convey why the original room was shut down.
|
|
Defaults to `Sharing illegal content on this server is not
|
|
permitted and rooms in violation will be blocked.`
|
|
block:
|
|
If set to `true`, this room will be added to a blocking list,
|
|
preventing future attempts to join the room. Defaults to `false`.
|
|
purge:
|
|
If set to `true`, purge the given room from the database.
|
|
force_purge:
|
|
If set to `true`, the room will be purged from database
|
|
also if it fails to remove some users from room.
|
|
|
|
Saves a `RoomShutdownHandler.ShutdownRoomResponse` in `DeleteStatus`:
|
|
"""
|
|
|
|
self._purges_in_progress_by_room.add(room_id)
|
|
try:
|
|
with await self.pagination_lock.write(room_id):
|
|
self._delete_by_id[delete_id].status = DeleteStatus.STATUS_SHUTTING_DOWN
|
|
self._delete_by_id[
|
|
delete_id
|
|
].shutdown_room = await self._room_shutdown_handler.shutdown_room(
|
|
room_id=room_id,
|
|
requester_user_id=requester_user_id,
|
|
new_room_user_id=new_room_user_id,
|
|
new_room_name=new_room_name,
|
|
message=message,
|
|
block=block,
|
|
)
|
|
self._delete_by_id[delete_id].status = DeleteStatus.STATUS_PURGING
|
|
|
|
if purge:
|
|
logger.info("starting purge room_id %s", room_id)
|
|
|
|
# first check that we have no users in this room
|
|
if not force_purge:
|
|
joined = await self.store.is_host_joined(
|
|
room_id, self._server_name
|
|
)
|
|
if joined:
|
|
raise SynapseError(
|
|
400, "Users are still joined to this room"
|
|
)
|
|
|
|
await self.storage.purge_events.purge_room(room_id)
|
|
|
|
logger.info("complete")
|
|
self._delete_by_id[delete_id].status = DeleteStatus.STATUS_COMPLETE
|
|
except Exception:
|
|
f = Failure()
|
|
logger.error(
|
|
"failed",
|
|
exc_info=(f.type, f.value, f.getTracebackObject()), # type: ignore
|
|
)
|
|
self._delete_by_id[delete_id].status = DeleteStatus.STATUS_FAILED
|
|
self._delete_by_id[delete_id].error = f.getErrorMessage()
|
|
finally:
|
|
self._purges_in_progress_by_room.discard(room_id)
|
|
|
|
# remove the delete from the list 24 hours after it completes
|
|
def clear_delete() -> None:
|
|
del self._delete_by_id[delete_id]
|
|
self._delete_by_room[room_id].remove(delete_id)
|
|
if not self._delete_by_room[room_id]:
|
|
del self._delete_by_room[room_id]
|
|
|
|
self.hs.get_reactor().callLater(
|
|
PaginationHandler.CLEAR_PURGE_AFTER_MS / 1000, clear_delete
|
|
)
|
|
|
|
def start_shutdown_and_purge_room(
|
|
self,
|
|
room_id: str,
|
|
requester_user_id: str,
|
|
new_room_user_id: Optional[str] = None,
|
|
new_room_name: Optional[str] = None,
|
|
message: Optional[str] = None,
|
|
block: bool = False,
|
|
purge: bool = True,
|
|
force_purge: bool = False,
|
|
) -> str:
|
|
"""Start off shut down and purge on a room.
|
|
|
|
Args:
|
|
room_id: The ID of the room to shut down.
|
|
requester_user_id:
|
|
User who requested the action and put the room on the
|
|
blocking list.
|
|
new_room_user_id:
|
|
If set, a new room will be created with this user ID
|
|
as the creator and admin, and all users in the old room will be
|
|
moved into that room. If not set, no new room will be created
|
|
and the users will just be removed from the old room.
|
|
new_room_name:
|
|
A string representing the name of the room that new users will
|
|
be invited to. Defaults to `Content Violation Notification`
|
|
message:
|
|
A string containing the first message that will be sent as
|
|
`new_room_user_id` in the new room. Ideally this will clearly
|
|
convey why the original room was shut down.
|
|
Defaults to `Sharing illegal content on this server is not
|
|
permitted and rooms in violation will be blocked.`
|
|
block:
|
|
If set to `true`, this room will be added to a blocking list,
|
|
preventing future attempts to join the room. Defaults to `false`.
|
|
purge:
|
|
If set to `true`, purge the given room from the database.
|
|
force_purge:
|
|
If set to `true`, the room will be purged from database
|
|
also if it fails to remove some users from room.
|
|
|
|
Returns:
|
|
unique ID for this delete transaction.
|
|
"""
|
|
if room_id in self._purges_in_progress_by_room:
|
|
raise SynapseError(
|
|
400, "History purge already in progress for %s" % (room_id,)
|
|
)
|
|
|
|
# This check is double to `RoomShutdownHandler.shutdown_room`
|
|
# But here the requester get a direct response / error with HTTP request
|
|
# and do not have to check the purge status
|
|
if new_room_user_id is not None:
|
|
if not self.hs.is_mine_id(new_room_user_id):
|
|
raise SynapseError(
|
|
400, "User must be our own: %s" % (new_room_user_id,)
|
|
)
|
|
|
|
delete_id = random_string(16)
|
|
|
|
# we log the delete_id here so that it can be tied back to the
|
|
# request id in the log lines.
|
|
logger.info(
|
|
"starting shutdown room_id %s with delete_id %s",
|
|
room_id,
|
|
delete_id,
|
|
)
|
|
|
|
self._delete_by_id[delete_id] = DeleteStatus()
|
|
self._delete_by_room.setdefault(room_id, []).append(delete_id)
|
|
run_as_background_process(
|
|
"shutdown_and_purge_room",
|
|
self._shutdown_and_purge_room,
|
|
delete_id,
|
|
room_id,
|
|
requester_user_id,
|
|
new_room_user_id,
|
|
new_room_name,
|
|
message,
|
|
block,
|
|
purge,
|
|
force_purge,
|
|
)
|
|
return delete_id
|