synapse/synapse/handlers/read_marker.py
Sean Quah 800ba87cc8
Refactor and convert Linearizer to async (#12357)
Refactor and convert `Linearizer` to async. This makes a `Linearizer`
cancellation bug easier to fix.

Also refactor to use an async context manager, which eliminates an
unlikely footgun where code that doesn't immediately use the context
manager could forget to release the lock.

Signed-off-by: Sean Quah <seanq@element.io>
2022-04-05 15:43:52 +01:00

60 lines
2.2 KiB
Python

# Copyright 2017 Vector Creations 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
from synapse.util.async_helpers import Linearizer
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
class ReadMarkerHandler:
def __init__(self, hs: "HomeServer"):
self.server_name = hs.config.server.server_name
self.store = hs.get_datastores().main
self.account_data_handler = hs.get_account_data_handler()
self.read_marker_linearizer = Linearizer(name="read_marker")
async def received_client_read_marker(
self, room_id: str, user_id: str, event_id: str
) -> None:
"""Updates the read marker for a given user in a given room if the event ID given
is ahead in the stream relative to the current read marker.
This uses a notifier to indicate that account data should be sent down /sync if
the read marker has changed.
"""
async with self.read_marker_linearizer.queue((room_id, user_id)):
existing_read_marker = await self.store.get_account_data_for_room_and_type(
user_id, room_id, "m.fully_read"
)
should_update = True
if existing_read_marker:
# Only update if the new marker is ahead in the stream
should_update = await self.store.is_event_after(
event_id, existing_read_marker["event_id"]
)
if should_update:
content = {"event_id": event_id}
await self.account_data_handler.add_account_data_to_room(
user_id, room_id, "m.fully_read", content
)