223 lines
8.4 KiB
Python
223 lines
8.4 KiB
Python
# Copyright 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, List, Tuple
|
|
|
|
from synapse.api.constants import (
|
|
EventTypes,
|
|
LimitBlockingTypes,
|
|
ServerNoticeLimitReached,
|
|
ServerNoticeMsgType,
|
|
)
|
|
from synapse.api.errors import AuthError, ResourceLimitError, SynapseError
|
|
from synapse.server_notices.server_notices_manager import SERVER_NOTICE_ROOM_TAG
|
|
|
|
if TYPE_CHECKING:
|
|
from synapse.server import HomeServer
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class ResourceLimitsServerNotices:
|
|
"""Keeps track of whether the server has reached it's resource limit and
|
|
ensures that the client is kept up to date.
|
|
"""
|
|
|
|
def __init__(self, hs: "HomeServer"):
|
|
self._server_notices_manager = hs.get_server_notices_manager()
|
|
self._store = hs.get_datastore()
|
|
self._auth = hs.get_auth()
|
|
self._config = hs.config
|
|
self._resouce_limited = False
|
|
self._account_data_handler = hs.get_account_data_handler()
|
|
self._message_handler = hs.get_message_handler()
|
|
self._state = hs.get_state_handler()
|
|
|
|
self._notifier = hs.get_notifier()
|
|
|
|
self._enabled = (
|
|
hs.config.server.limit_usage_by_mau
|
|
and self._server_notices_manager.is_enabled()
|
|
and not hs.config.server.hs_disabled
|
|
)
|
|
|
|
async def maybe_send_server_notice_to_user(self, user_id: str) -> None:
|
|
"""Check if we need to send a notice to this user, this will be true in
|
|
two cases.
|
|
1. The server has reached its limit does not reflect this
|
|
2. The room state indicates that the server has reached its limit when
|
|
actually the server is fine
|
|
|
|
Args:
|
|
user_id: user to check
|
|
"""
|
|
if not self._enabled:
|
|
return
|
|
|
|
timestamp = await self._store.user_last_seen_monthly_active(user_id)
|
|
if timestamp is None:
|
|
# This user will be blocked from receiving the notice anyway.
|
|
# In practice, not sure we can ever get here
|
|
return
|
|
|
|
room_id = await self._server_notices_manager.get_or_create_notice_room_for_user(
|
|
user_id
|
|
)
|
|
|
|
if not room_id:
|
|
logger.warning("Failed to get server notices room")
|
|
return
|
|
|
|
await self._check_and_set_tags(user_id, room_id)
|
|
|
|
# Determine current state of room
|
|
currently_blocked, ref_events = await self._is_room_currently_blocked(room_id)
|
|
|
|
limit_msg = None
|
|
limit_type = None
|
|
try:
|
|
# Normally should always pass in user_id to check_auth_blocking
|
|
# if you have it, but in this case are checking what would happen
|
|
# to other users if they were to arrive.
|
|
await self._auth.check_auth_blocking()
|
|
except ResourceLimitError as e:
|
|
limit_msg = e.msg
|
|
limit_type = e.limit_type
|
|
|
|
try:
|
|
if (
|
|
limit_type == LimitBlockingTypes.MONTHLY_ACTIVE_USER
|
|
and not self._config.server.mau_limit_alerting
|
|
):
|
|
# We have hit the MAU limit, but MAU alerting is disabled:
|
|
# reset room if necessary and return
|
|
if currently_blocked:
|
|
await self._remove_limit_block_notification(user_id, ref_events)
|
|
return
|
|
|
|
if currently_blocked and not limit_msg:
|
|
# Room is notifying of a block, when it ought not to be.
|
|
await self._remove_limit_block_notification(user_id, ref_events)
|
|
elif not currently_blocked and limit_msg:
|
|
# Room is not notifying of a block, when it ought to be.
|
|
await self._apply_limit_block_notification(
|
|
user_id, limit_msg, limit_type # type: ignore
|
|
)
|
|
except SynapseError as e:
|
|
logger.error("Error sending resource limits server notice: %s", e)
|
|
|
|
async def _remove_limit_block_notification(
|
|
self, user_id: str, ref_events: List[str]
|
|
) -> None:
|
|
"""Utility method to remove limit block notifications from the server
|
|
notices room.
|
|
|
|
Args:
|
|
user_id: user to notify
|
|
ref_events: The event_ids of pinned events that are unrelated to
|
|
limit blocking and need to be preserved.
|
|
"""
|
|
content = {"pinned": ref_events}
|
|
await self._server_notices_manager.send_notice(
|
|
user_id, content, EventTypes.Pinned, ""
|
|
)
|
|
|
|
async def _apply_limit_block_notification(
|
|
self, user_id: str, event_body: str, event_limit_type: str
|
|
) -> None:
|
|
"""Utility method to apply limit block notifications in the server
|
|
notices room.
|
|
|
|
Args:
|
|
user_id: user to notify
|
|
event_body: The human readable text that describes the block.
|
|
event_limit_type: Specifies the type of block e.g. monthly active user
|
|
limit has been exceeded.
|
|
"""
|
|
content = {
|
|
"body": event_body,
|
|
"msgtype": ServerNoticeMsgType,
|
|
"server_notice_type": ServerNoticeLimitReached,
|
|
"admin_contact": self._config.server.admin_contact,
|
|
"limit_type": event_limit_type,
|
|
}
|
|
event = await self._server_notices_manager.send_notice(
|
|
user_id, content, EventTypes.Message
|
|
)
|
|
|
|
content = {"pinned": [event.event_id]}
|
|
await self._server_notices_manager.send_notice(
|
|
user_id, content, EventTypes.Pinned, ""
|
|
)
|
|
|
|
async def _check_and_set_tags(self, user_id: str, room_id: str) -> None:
|
|
"""
|
|
Since server notices rooms were originally not with tags,
|
|
important to check that tags have been set correctly
|
|
Args:
|
|
user_id(str): the user in question
|
|
room_id(str): the server notices room for that user
|
|
"""
|
|
tags = await self._store.get_tags_for_room(user_id, room_id)
|
|
need_to_set_tag = True
|
|
if tags:
|
|
if SERVER_NOTICE_ROOM_TAG in tags:
|
|
# tag already present, nothing to do here
|
|
need_to_set_tag = False
|
|
if need_to_set_tag:
|
|
max_id = await self._account_data_handler.add_tag_to_room(
|
|
user_id, room_id, SERVER_NOTICE_ROOM_TAG, {}
|
|
)
|
|
self._notifier.on_new_event("account_data_key", max_id, users=[user_id])
|
|
|
|
async def _is_room_currently_blocked(self, room_id: str) -> Tuple[bool, List[str]]:
|
|
"""
|
|
Determines if the room is currently blocked
|
|
|
|
Args:
|
|
room_id: The room id of the server notices room
|
|
|
|
Returns:
|
|
bool: Is the room currently blocked
|
|
list: The list of pinned event IDs that are unrelated to limit blocking
|
|
This list can be used as a convenience in the case where the block
|
|
is to be lifted and the remaining pinned event references need to be
|
|
preserved
|
|
"""
|
|
currently_blocked = False
|
|
pinned_state_event = None
|
|
try:
|
|
pinned_state_event = await self._state.get_current_state(
|
|
room_id, event_type=EventTypes.Pinned
|
|
)
|
|
except AuthError:
|
|
# The user has yet to join the server notices room
|
|
pass
|
|
|
|
referenced_events: List[str] = []
|
|
if pinned_state_event is not None:
|
|
referenced_events = list(pinned_state_event.content.get("pinned", []))
|
|
|
|
events = await self._store.get_events(referenced_events)
|
|
for event_id, event in events.items():
|
|
if event.type != EventTypes.Message:
|
|
continue
|
|
if event.content.get("msgtype") == ServerNoticeMsgType:
|
|
currently_blocked = True
|
|
# remove event in case we need to disable blocking later on.
|
|
if event_id in referenced_events:
|
|
referenced_events.remove(event.event_id)
|
|
|
|
return currently_blocked, referenced_events
|