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https://github.com/element-hq/synapse.git
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800ba87cc8
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>
60 lines
2.2 KiB
Python
60 lines
2.2 KiB
Python
# Copyright 2017 Vector Creations Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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from typing import TYPE_CHECKING
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from synapse.util.async_helpers import Linearizer
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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class ReadMarkerHandler:
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def __init__(self, hs: "HomeServer"):
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self.server_name = hs.config.server.server_name
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self.store = hs.get_datastores().main
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self.account_data_handler = hs.get_account_data_handler()
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self.read_marker_linearizer = Linearizer(name="read_marker")
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async def received_client_read_marker(
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self, room_id: str, user_id: str, event_id: str
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) -> None:
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"""Updates the read marker for a given user in a given room if the event ID given
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is ahead in the stream relative to the current read marker.
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This uses a notifier to indicate that account data should be sent down /sync if
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the read marker has changed.
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"""
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async with self.read_marker_linearizer.queue((room_id, user_id)):
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existing_read_marker = await self.store.get_account_data_for_room_and_type(
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user_id, room_id, "m.fully_read"
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)
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should_update = True
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if existing_read_marker:
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# Only update if the new marker is ahead in the stream
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should_update = await self.store.is_event_after(
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event_id, existing_read_marker["event_id"]
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)
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if should_update:
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content = {"event_id": event_id}
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await self.account_data_handler.add_account_data_to_room(
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user_id, room_id, "m.fully_read", content
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)
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