When a client asks for remote keys check if should resync. (#6797)

If we detect that the remote users' keys may have changed then we should
attempt to resync against the remote server rather than using the
(potentially) stale local cache.
This commit is contained in:
Erik Johnston 2020-01-30 15:06:58 +00:00 committed by GitHub
parent 5a246611e3
commit c80a9fe13d
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2 changed files with 30 additions and 3 deletions

1
changelog.d/6797.misc Normal file
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@ -0,0 +1 @@
When a client asks for a remote user's device keys check if the local cache for that user has been marked as potentially stale.

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@ -32,7 +32,7 @@ from synapse.logging.opentracing import (
from synapse.metrics.background_process_metrics import run_as_background_process
from synapse.storage._base import SQLBaseStore, db_to_json, make_in_list_sql_clause
from synapse.storage.database import Database
from synapse.types import get_verify_key_from_cross_signing_key
from synapse.types import Collection, get_verify_key_from_cross_signing_key
from synapse.util.caches.descriptors import (
Cache,
cached,
@ -443,8 +443,15 @@ class DeviceWorkerStore(SQLBaseStore):
"""
user_ids = set(user_id for user_id, _ in query_list)
user_map = yield self.get_device_list_last_stream_id_for_remotes(list(user_ids))
user_ids_in_cache = set(
user_id for user_id, stream_id in user_map.items() if stream_id
# We go and check if any of the users need to have their device lists
# resynced. If they do then we remove them from the cached list.
users_needing_resync = yield self.get_user_ids_requiring_device_list_resync(
user_ids
)
user_ids_in_cache = (
set(user_id for user_id, stream_id in user_map.items() if stream_id)
- users_needing_resync
)
user_ids_not_in_cache = user_ids - user_ids_in_cache
@ -641,6 +648,25 @@ class DeviceWorkerStore(SQLBaseStore):
return results
@defer.inlineCallbacks
def get_user_ids_requiring_device_list_resync(self, user_ids: Collection[str]):
"""Given a list of remote users return the list of users that we
should resync the device lists for.
Returns:
Deferred[Set[str]]
"""
rows = yield self.db.simple_select_many_batch(
table="device_lists_remote_resync",
column="user_id",
iterable=user_ids,
retcols=("user_id",),
desc="get_user_ids_requiring_device_list_resync",
)
return {row["user_id"] for row in rows}
def mark_remote_user_device_cache_as_stale(self, user_id: str):
"""Records that the server has reason to believe the cache of the devices
for the remote users is out of date.