diff --git a/synapse/server_notices/resource_limits_server_notices.py b/synapse/server_notices/resource_limits_server_notices.py
new file mode 100644
index 0000000000..af15cba0ee
--- /dev/null
+++ b/synapse/server_notices/resource_limits_server_notices.py
@@ -0,0 +1,203 @@
+# -*- 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,
+ ServerNoticeLimitReached,
+ ServerNoticeMsgType,
+)
+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()
+
+ self._notifier = hs.get_notifier()
+
+ @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
+
+ if not self._server_notices_manager.is_enabled():
+ # Don't try and send server notices unles they've been enabled
+ 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)
+
+ if not room_id:
+ logger.warn("Failed to get server notices room")
+ return
+
+ 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,
+ 'msgtype': ServerNoticeMsgType,
+ 'server_notice_type': ServerNoticeLimitReached,
+ 'admin_contact': self._config.admin_contact,
+ 'limit_type': event_limit_type
+ }
+ event = yield self._server_notices_manager.send_notice(
+ user_id, content, EventTypes.Message,
+ )
+
+ 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_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 = yield self._store.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]
+ )
+
+ @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 = list(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.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)
+
+ defer.returnValue((currently_blocked, referenced_events))
diff --git a/synapse/server_notices/server_notices_manager.py b/synapse/server_notices/server_notices_manager.py
index a26deace53..c5cc6d728e 100644
--- a/synapse/server_notices/server_notices_manager.py
+++ b/synapse/server_notices/server_notices_manager.py
@@ -22,6 +22,8 @@ from synapse.util.caches.descriptors import cachedInlineCallbacks
logger = logging.getLogger(__name__)
+SERVER_NOTICE_ROOM_TAG = "m.server_notice"
+
class ServerNoticesManager(object):
def __init__(self, hs):
@@ -37,6 +39,8 @@ class ServerNoticesManager(object):
self._event_creation_handler = hs.get_event_creation_handler()
self._is_mine_id = hs.is_mine_id
+ self._notifier = hs.get_notifier()
+
def is_enabled(self):
"""Checks if server notices are enabled on this server.
@@ -46,7 +50,10 @@ class ServerNoticesManager(object):
return self._config.server_notices_mxid is not None
@defer.inlineCallbacks
- def send_notice(self, user_id, event_content):
+ def send_notice(
+ self, user_id, event_content,
+ type=EventTypes.Message, state_key=None
+ ):
"""Send a notice to the given user
Creates the server notices room, if none exists.
@@ -54,9 +61,11 @@ class ServerNoticesManager(object):
Args:
user_id (str): mxid of user to send event to.
event_content (dict): content of event to send
+ type(EventTypes): type of event
+ is_state_event(bool): Is the event a state event
Returns:
- Deferred[None]
+ Deferred[FrozenEvent]
"""
room_id = yield self.get_notice_room_for_user(user_id)
@@ -65,15 +74,20 @@ class ServerNoticesManager(object):
logger.info("Sending server notice to %s", user_id)
- yield self._event_creation_handler.create_and_send_nonmember_event(
- requester, {
- "type": EventTypes.Message,
- "room_id": room_id,
- "sender": system_mxid,
- "content": event_content,
- },
- ratelimit=False,
+ event_dict = {
+ "type": type,
+ "room_id": room_id,
+ "sender": system_mxid,
+ "content": event_content,
+ }
+
+ if state_key is not None:
+ event_dict['state_key'] = state_key
+
+ res = yield self._event_creation_handler.create_and_send_nonmember_event(
+ requester, event_dict, ratelimit=False,
)
+ defer.returnValue(res)
@cachedInlineCallbacks()
def get_notice_room_for_user(self, user_id):
@@ -142,5 +156,12 @@ class ServerNoticesManager(object):
)
room_id = info['room_id']
+ max_id = yield self._store.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]
+ )
+
logger.info("Created server notices room %s for %s", room_id, user_id)
defer.returnValue(room_id)
diff --git a/synapse/server_notices/server_notices_sender.py b/synapse/server_notices/server_notices_sender.py
index 5d23965f34..6121b2f267 100644
--- a/synapse/server_notices/server_notices_sender.py
+++ b/synapse/server_notices/server_notices_sender.py
@@ -12,7 +12,12 @@
# 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.
+from twisted.internet import defer
+
from synapse.server_notices.consent_server_notices import ConsentServerNotices
+from synapse.server_notices.resource_limits_server_notices import (
+ ResourceLimitsServerNotices,
+)
class ServerNoticesSender(object):
@@ -25,34 +30,34 @@ class ServerNoticesSender(object):
Args:
hs (synapse.server.HomeServer):
"""
- # todo: it would be nice to make this more dynamic
- self._consent_server_notices = ConsentServerNotices(hs)
+ self._server_notices = (
+ ConsentServerNotices(hs),
+ ResourceLimitsServerNotices(hs)
+ )
+ @defer.inlineCallbacks
def on_user_syncing(self, user_id):
"""Called when the user performs a sync operation.
Args:
user_id (str): mxid of user who synced
-
- Returns:
- Deferred
"""
- return self._consent_server_notices.maybe_send_server_notice_to_user(
- user_id,
- )
+ for sn in self._server_notices:
+ yield sn.maybe_send_server_notice_to_user(
+ user_id,
+ )
+ @defer.inlineCallbacks
def on_user_ip(self, user_id):
"""Called on the master when a worker process saw a client request.
Args:
user_id (str): mxid
-
- Returns:
- Deferred
"""
# The synchrotrons use a stubbed version of ServerNoticesSender, so
# we check for notices to send to the user in on_user_ip as well as
# in on_user_syncing
- return self._consent_server_notices.maybe_send_server_notice_to_user(
- user_id,
- )
+ for sn in self._server_notices:
+ yield sn.maybe_send_server_notice_to_user(
+ user_id,
+ )
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