mirror of
https://git.anonymousland.org/anonymousland/synapse-product.git
synced 2024-12-29 22:16:11 -05:00
456 lines
17 KiB
Python
456 lines
17 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2014 - 2016 OpenMarket Ltd
|
|
# Copyright 2017 - 2018 New Vector Ltd
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
import logging
|
|
from typing import TYPE_CHECKING, Any, Dict, Optional, Set
|
|
|
|
from twisted.python.failure import Failure
|
|
|
|
from synapse.api.constants import EventTypes, Membership
|
|
from synapse.api.errors import SynapseError
|
|
from synapse.api.filtering import Filter
|
|
from synapse.logging.context import run_in_background
|
|
from synapse.metrics.background_process_metrics import run_as_background_process
|
|
from synapse.storage.state import StateFilter
|
|
from synapse.streams.config import PaginationConfig
|
|
from synapse.types import Requester, RoomStreamToken
|
|
from synapse.util.async_helpers import ReadWriteLock
|
|
from synapse.util.stringutils import random_string
|
|
from synapse.visibility import filter_events_for_client
|
|
|
|
if TYPE_CHECKING:
|
|
from synapse.server import HomeServer
|
|
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class PurgeStatus:
|
|
"""Object tracking the status of a purge request
|
|
|
|
This class contains information on the progress of a purge request, for
|
|
return by get_purge_status.
|
|
|
|
Attributes:
|
|
status (int): Tracks whether this request has completed. One of
|
|
STATUS_{ACTIVE,COMPLETE,FAILED}
|
|
"""
|
|
|
|
STATUS_ACTIVE = 0
|
|
STATUS_COMPLETE = 1
|
|
STATUS_FAILED = 2
|
|
|
|
STATUS_TEXT = {
|
|
STATUS_ACTIVE: "active",
|
|
STATUS_COMPLETE: "complete",
|
|
STATUS_FAILED: "failed",
|
|
}
|
|
|
|
def __init__(self):
|
|
self.status = PurgeStatus.STATUS_ACTIVE
|
|
|
|
def asdict(self):
|
|
return {"status": PurgeStatus.STATUS_TEXT[self.status]}
|
|
|
|
|
|
class PaginationHandler:
|
|
"""Handles pagination and purge history requests.
|
|
|
|
These are in the same handler due to the fact we need to block clients
|
|
paginating during a purge.
|
|
"""
|
|
|
|
def __init__(self, hs: "HomeServer"):
|
|
self.hs = hs
|
|
self.auth = hs.get_auth()
|
|
self.store = hs.get_datastore()
|
|
self.storage = hs.get_storage()
|
|
self.state_store = self.storage.state
|
|
self.clock = hs.get_clock()
|
|
self._server_name = hs.hostname
|
|
|
|
self.pagination_lock = ReadWriteLock()
|
|
self._purges_in_progress_by_room = set() # type: Set[str]
|
|
# map from purge id to PurgeStatus
|
|
self._purges_by_id = {} # type: Dict[str, PurgeStatus]
|
|
self._event_serializer = hs.get_event_client_serializer()
|
|
|
|
self._retention_default_max_lifetime = hs.config.retention_default_max_lifetime
|
|
|
|
self._retention_allowed_lifetime_min = hs.config.retention_allowed_lifetime_min
|
|
self._retention_allowed_lifetime_max = hs.config.retention_allowed_lifetime_max
|
|
|
|
if hs.config.retention_enabled:
|
|
# Run the purge jobs described in the configuration file.
|
|
for job in hs.config.retention_purge_jobs:
|
|
logger.info("Setting up purge job with config: %s", job)
|
|
|
|
self.clock.looping_call(
|
|
run_as_background_process,
|
|
job["interval"],
|
|
"purge_history_for_rooms_in_range",
|
|
self.purge_history_for_rooms_in_range,
|
|
job["shortest_max_lifetime"],
|
|
job["longest_max_lifetime"],
|
|
)
|
|
|
|
async def purge_history_for_rooms_in_range(
|
|
self, min_ms: Optional[int], max_ms: Optional[int]
|
|
):
|
|
"""Purge outdated events from rooms within the given retention range.
|
|
|
|
If a default retention policy is defined in the server's configuration and its
|
|
'max_lifetime' is within this range, also targets rooms which don't have a
|
|
retention policy.
|
|
|
|
Args:
|
|
min_ms: Duration in milliseconds that define the lower limit of
|
|
the range to handle (exclusive). If None, it means that the range has no
|
|
lower limit.
|
|
max_ms: Duration in milliseconds that define the upper limit of
|
|
the range to handle (inclusive). If None, it means that the range has no
|
|
upper limit.
|
|
"""
|
|
# We want the storage layer to include rooms with no retention policy in its
|
|
# return value only if a default retention policy is defined in the server's
|
|
# configuration and that policy's 'max_lifetime' is either lower (or equal) than
|
|
# max_ms or higher than min_ms (or both).
|
|
if self._retention_default_max_lifetime is not None:
|
|
include_null = True
|
|
|
|
if min_ms is not None and min_ms >= self._retention_default_max_lifetime:
|
|
# The default max_lifetime is lower than (or equal to) min_ms.
|
|
include_null = False
|
|
|
|
if max_ms is not None and max_ms < self._retention_default_max_lifetime:
|
|
# The default max_lifetime is higher than max_ms.
|
|
include_null = False
|
|
else:
|
|
include_null = False
|
|
|
|
logger.info(
|
|
"[purge] Running purge job for %s < max_lifetime <= %s (include NULLs = %s)",
|
|
min_ms,
|
|
max_ms,
|
|
include_null,
|
|
)
|
|
|
|
rooms = await self.store.get_rooms_for_retention_period_in_range(
|
|
min_ms, max_ms, include_null
|
|
)
|
|
|
|
logger.debug("[purge] Rooms to purge: %s", rooms)
|
|
|
|
for room_id, retention_policy in rooms.items():
|
|
logger.info("[purge] Attempting to purge messages in room %s", room_id)
|
|
|
|
if room_id in self._purges_in_progress_by_room:
|
|
logger.warning(
|
|
"[purge] not purging room %s as there's an ongoing purge running"
|
|
" for this room",
|
|
room_id,
|
|
)
|
|
continue
|
|
|
|
# If max_lifetime is None, it means that the room has no retention policy.
|
|
# Given we only retrieve such rooms when there's a default retention policy
|
|
# defined in the server's configuration, we can safely assume that's the
|
|
# case and use it for this room.
|
|
max_lifetime = (
|
|
retention_policy["max_lifetime"] or self._retention_default_max_lifetime
|
|
)
|
|
|
|
# Cap the effective max_lifetime to be within the range allowed in the
|
|
# config.
|
|
# We do this in two steps:
|
|
# 1. Make sure it's higher or equal to the minimum allowed value, and if
|
|
# it's not replace it with that value. This is because the server
|
|
# operator can be required to not delete information before a given
|
|
# time, e.g. to comply with freedom of information laws.
|
|
# 2. Make sure the resulting value is lower or equal to the maximum allowed
|
|
# value, and if it's not replace it with that value. This is because the
|
|
# server operator can be required to delete any data after a specific
|
|
# amount of time.
|
|
if self._retention_allowed_lifetime_min is not None:
|
|
max_lifetime = max(self._retention_allowed_lifetime_min, max_lifetime)
|
|
|
|
if self._retention_allowed_lifetime_max is not None:
|
|
max_lifetime = min(max_lifetime, self._retention_allowed_lifetime_max)
|
|
|
|
logger.debug("[purge] max_lifetime for room %s: %s", room_id, max_lifetime)
|
|
|
|
# Figure out what token we should start purging at.
|
|
ts = self.clock.time_msec() - max_lifetime
|
|
|
|
stream_ordering = await self.store.find_first_stream_ordering_after_ts(ts)
|
|
|
|
r = await self.store.get_room_event_before_stream_ordering(
|
|
room_id, stream_ordering,
|
|
)
|
|
if not r:
|
|
logger.warning(
|
|
"[purge] purging events not possible: No event found "
|
|
"(ts %i => stream_ordering %i)",
|
|
ts,
|
|
stream_ordering,
|
|
)
|
|
continue
|
|
|
|
(stream, topo, _event_id) = r
|
|
token = "t%d-%d" % (topo, stream)
|
|
|
|
purge_id = random_string(16)
|
|
|
|
self._purges_by_id[purge_id] = PurgeStatus()
|
|
|
|
logger.info(
|
|
"Starting purging events in room %s (purge_id %s)" % (room_id, purge_id)
|
|
)
|
|
|
|
# We want to purge everything, including local events, and to run the purge in
|
|
# the background so that it's not blocking any other operation apart from
|
|
# other purges in the same room.
|
|
run_as_background_process(
|
|
"_purge_history", self._purge_history, purge_id, room_id, token, True,
|
|
)
|
|
|
|
def start_purge_history(
|
|
self, room_id: str, token: str, delete_local_events: bool = False
|
|
) -> str:
|
|
"""Start off a history purge on a room.
|
|
|
|
Args:
|
|
room_id: The room to purge from
|
|
token: topological token to delete events before
|
|
delete_local_events: True to delete local events as well as
|
|
remote ones
|
|
|
|
Returns:
|
|
unique ID for this purge transaction.
|
|
"""
|
|
if room_id in self._purges_in_progress_by_room:
|
|
raise SynapseError(
|
|
400, "History purge already in progress for %s" % (room_id,)
|
|
)
|
|
|
|
purge_id = random_string(16)
|
|
|
|
# we log the purge_id here so that it can be tied back to the
|
|
# request id in the log lines.
|
|
logger.info("[purge] starting purge_id %s", purge_id)
|
|
|
|
self._purges_by_id[purge_id] = PurgeStatus()
|
|
run_in_background(
|
|
self._purge_history, purge_id, room_id, token, delete_local_events
|
|
)
|
|
return purge_id
|
|
|
|
async def _purge_history(
|
|
self, purge_id: str, room_id: str, token: str, delete_local_events: bool
|
|
) -> None:
|
|
"""Carry out a history purge on a room.
|
|
|
|
Args:
|
|
purge_id: The id for this purge
|
|
room_id: The room to purge from
|
|
token: topological token to delete events before
|
|
delete_local_events: True to delete local events as well as remote ones
|
|
"""
|
|
self._purges_in_progress_by_room.add(room_id)
|
|
try:
|
|
with await self.pagination_lock.write(room_id):
|
|
await self.storage.purge_events.purge_history(
|
|
room_id, token, delete_local_events
|
|
)
|
|
logger.info("[purge] complete")
|
|
self._purges_by_id[purge_id].status = PurgeStatus.STATUS_COMPLETE
|
|
except Exception:
|
|
f = Failure()
|
|
logger.error(
|
|
"[purge] failed", exc_info=(f.type, f.value, f.getTracebackObject())
|
|
)
|
|
self._purges_by_id[purge_id].status = PurgeStatus.STATUS_FAILED
|
|
finally:
|
|
self._purges_in_progress_by_room.discard(room_id)
|
|
|
|
# remove the purge from the list 24 hours after it completes
|
|
def clear_purge():
|
|
del self._purges_by_id[purge_id]
|
|
|
|
self.hs.get_reactor().callLater(24 * 3600, clear_purge)
|
|
|
|
def get_purge_status(self, purge_id: str) -> Optional[PurgeStatus]:
|
|
"""Get the current status of an active purge
|
|
|
|
Args:
|
|
purge_id: purge_id returned by start_purge_history
|
|
"""
|
|
return self._purges_by_id.get(purge_id)
|
|
|
|
async def purge_room(self, room_id: str) -> None:
|
|
"""Purge the given room from the database"""
|
|
with await self.pagination_lock.write(room_id):
|
|
# check we know about the room
|
|
await self.store.get_room_version_id(room_id)
|
|
|
|
# first check that we have no users in this room
|
|
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)
|
|
|
|
async def get_messages(
|
|
self,
|
|
requester: Requester,
|
|
room_id: str,
|
|
pagin_config: PaginationConfig,
|
|
as_client_event: bool = True,
|
|
event_filter: Optional[Filter] = None,
|
|
) -> Dict[str, Any]:
|
|
"""Get messages in a room.
|
|
|
|
Args:
|
|
requester: The user requesting messages.
|
|
room_id: The room they want messages from.
|
|
pagin_config: The pagination config rules to apply, if any.
|
|
as_client_event: True to get events in client-server format.
|
|
event_filter: Filter to apply to results or None
|
|
Returns:
|
|
Pagination API results
|
|
"""
|
|
user_id = requester.user.to_string()
|
|
|
|
if pagin_config.from_token:
|
|
from_token = pagin_config.from_token
|
|
else:
|
|
from_token = self.hs.get_event_sources().get_current_token_for_pagination()
|
|
|
|
if pagin_config.limit is None:
|
|
# This shouldn't happen as we've set a default limit before this
|
|
# gets called.
|
|
raise Exception("limit not set")
|
|
|
|
room_token = from_token.room_key
|
|
|
|
with await self.pagination_lock.read(room_id):
|
|
(
|
|
membership,
|
|
member_event_id,
|
|
) = await self.auth.check_user_in_room_or_world_readable(
|
|
room_id, user_id, allow_departed_users=True
|
|
)
|
|
|
|
if pagin_config.direction == "b":
|
|
# if we're going backwards, we might need to backfill. This
|
|
# requires that we have a topo token.
|
|
if room_token.topological:
|
|
curr_topo = room_token.topological
|
|
else:
|
|
curr_topo = await self.store.get_current_topological_token(
|
|
room_id, room_token.stream
|
|
)
|
|
|
|
if membership == Membership.LEAVE:
|
|
# If they have left the room then clamp the token to be before
|
|
# they left the room, to save the effort of loading from the
|
|
# database.
|
|
|
|
# This is only None if the room is world_readable, in which
|
|
# case "JOIN" would have been returned.
|
|
assert member_event_id
|
|
|
|
leave_token_str = await self.store.get_topological_token_for_event(
|
|
member_event_id
|
|
)
|
|
leave_token = RoomStreamToken.parse(leave_token_str)
|
|
assert leave_token.topological is not None
|
|
|
|
if leave_token.topological < curr_topo:
|
|
from_token = from_token.copy_and_replace(
|
|
"room_key", leave_token
|
|
)
|
|
|
|
await self.hs.get_handlers().federation_handler.maybe_backfill(
|
|
room_id, curr_topo, limit=pagin_config.limit,
|
|
)
|
|
|
|
to_room_key = None
|
|
if pagin_config.to_token:
|
|
to_room_key = pagin_config.to_token.room_key
|
|
|
|
events, next_key = await self.store.paginate_room_events(
|
|
room_id=room_id,
|
|
from_key=from_token.room_key,
|
|
to_key=to_room_key,
|
|
direction=pagin_config.direction,
|
|
limit=pagin_config.limit,
|
|
event_filter=event_filter,
|
|
)
|
|
|
|
next_token = from_token.copy_and_replace("room_key", next_key)
|
|
|
|
if events:
|
|
if event_filter:
|
|
events = 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": from_token.to_string(),
|
|
"end": next_token.to_string(),
|
|
}
|
|
|
|
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()
|
|
|
|
time_now = self.clock.time_msec()
|
|
|
|
chunk = {
|
|
"chunk": (
|
|
await self._event_serializer.serialize_events(
|
|
events, time_now, as_client_event=as_client_event
|
|
)
|
|
),
|
|
"start": from_token.to_string(),
|
|
"end": next_token.to_string(),
|
|
}
|
|
|
|
if state:
|
|
chunk["state"] = await self._event_serializer.serialize_events(
|
|
state, time_now, as_client_event=as_client_event
|
|
)
|
|
|
|
return chunk
|