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# -*- coding: utf-8 -*-
# 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 six import iteritems
from twisted.internet import defer
from synapse.api.constants import EventTypes
from synapse.api.errors import AuthError, ResourceLimitError, SynapseError
from synapse.server_notices.server_notices_manager import SERVER_NOTICE_ROOM_TAG
logger = logging.getLogger(__name__)
class ResourceLimitsServerNotices(object):
""" 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):
"""
Args:
hs (synapse.server.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._message_handler = hs.get_message_handler()
self._state = hs.get_state_handler()
@defer.inlineCallbacks
def maybe_send_server_notice_to_user(self, user_id):
"""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 (str): user to check
Returns:
Deferred
"""
if self._config.hs_disabled is True:
return
if self._config.limit_usage_by_mau is False:
return
timestamp = yield 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
# Determine current state of room
room_id = yield self._server_notices_manager.get_notice_room_for_user(user_id)
yield self._check_and_set_tags(user_id, room_id)
currently_blocked, ref_events = yield self._is_room_currently_blocked(room_id)
try:
# Normally should always pass in user_id if you have it, but in
# this case are checking what would happen to other users if they
# were to arrive.
try:
yield self._auth.check_auth_blocking()
is_auth_blocking = False
except ResourceLimitError as e:
is_auth_blocking = True
event_content = e.msg
event_limit_type = e.limit_type
if currently_blocked and not is_auth_blocking:
# Room is notifying of a block, when it ought not to be.
# Remove block notification
content = {
"pinned": ref_events
}
yield self._server_notices_manager.send_notice(
user_id, content, EventTypes.Pinned, '',
)
elif not currently_blocked and is_auth_blocking:
# Room is not notifying of a block, when it ought to be.
# Add block notification
content = {
'body': event_content,
'admin_uri': self._config.admin_uri,
'limit_type': event_limit_type
}
event = yield self._server_notices_manager.send_notice(
user_id, content, EventTypes.ServerNoticeLimitReached
)
content = {
"pinned": [
event.event_id,
]
}
yield self._server_notices_manager.send_notice(
user_id, content, EventTypes.Pinned, '',
)
except SynapseError as e:
logger.error("Error sending resource limits server notice: %s", e)
@defer.inlineCallbacks
def _check_and_set_tags(self, user_id, room_id):
"""
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 = yield self._store.get_tags_for_user(user_id)
server_notices_tags = tags.get(room_id)
need_to_set_tag = True
if server_notices_tags:
if server_notices_tags.get(SERVER_NOTICE_ROOM_TAG):
# tag already present, nothing to do here
need_to_set_tag = False
if need_to_set_tag:
yield self._store.add_tag_to_room(
user_id, room_id, SERVER_NOTICE_ROOM_TAG, None
)
@defer.inlineCallbacks
def _is_room_currently_blocked(self, room_id):
"""
Determines if the room is currently blocked
Args:
room_id(str): The room id of the server notices room
Returns:
bool: Is the room currently blocked
list: The list of pinned events 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 = yield 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 = []
if pinned_state_event is not None:
referenced_events = pinned_state_event.content.get('pinned')
events = yield self._store.get_events(referenced_events)
for event_id, event in iteritems(events):
if event.type == EventTypes.ServerNoticeLimitReached:
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)
defer.returnValue((currently_blocked, referenced_events))
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