diff --git a/synapse/storage/databases/main/devices.py b/synapse/storage/databases/main/devices.py
index 534f7fc04a..1e83c62753 100644
--- a/synapse/storage/databases/main/devices.py
+++ b/synapse/storage/databases/main/devices.py
@@ -1533,6 +1533,70 @@ class DeviceBackgroundUpdateStore(SQLBaseStore):
return rows
+ async def check_too_many_devices_for_user(self, user_id: str) -> Collection[str]:
+ """Check if the user has a lot of devices, and if so return the set of
+ devices we can prune.
+
+ This does *not* return hidden devices or devices with E2E keys.
+ """
+
+ num_devices = await self.db_pool.simple_select_one_onecol(
+ table="devices",
+ keyvalues={"user_id": user_id, "hidden": False},
+ retcol="COALESCE(COUNT(*), 0)",
+ desc="count_devices",
+ )
+
+ # We let users have up to ten devices without pruning.
+ if num_devices <= 10:
+ return ()
+
+ # We prune everything older than N days.
+ max_last_seen = self._clock.time_msec() - 14 * 24 * 60 * 60 * 1000
+
+ if num_devices > 50:
+ # If the user has more than 50 devices, then we chose a last seen
+ # that ensures we keep at most 50 devices.
+ sql = """
+ SELECT last_seen FROM devices
+ WHERE
+ user_id = ?
+ AND NOT hidden
+ AND last_seen IS NOT NULL
+ AND key_json IS NULL
+ ORDER BY last_seen DESC
+ LIMIT 1
+ OFFSET 50
+ """
+
+ rows = await self.db_pool.execute(
+ "check_too_many_devices_for_user_last_seen", None, sql, (user_id,)
+ )
+ if rows:
+ max_last_seen = max(rows[0][0], max_last_seen)
+
+ # Now fetch the devices to delete.
+ sql = """
+ SELECT DISTINCT device_id FROM devices
+ LEFT JOIN e2e_device_keys_json USING (user_id, device_id)
+ WHERE
+ user_id = ?
+ AND NOT hidden
+ AND last_seen < ?
+ AND key_json IS NULL
+ """
+
+ def check_too_many_devices_for_user_txn(
+ txn: LoggingTransaction,
+ ) -> Collection[str]:
+ txn.execute(sql, (user_id, max_last_seen))
+ return {device_id for device_id, in txn}
+
+ return await self.db_pool.runInteraction(
+ "check_too_many_devices_for_user",
+ check_too_many_devices_for_user_txn,
+ )
+
class DeviceStore(DeviceWorkerStore, DeviceBackgroundUpdateStore):
# Because we have write access, this will be a StreamIdGenerator
@@ -1591,6 +1655,7 @@ class DeviceStore(DeviceWorkerStore, DeviceBackgroundUpdateStore):
values={},
insertion_values={
"display_name": initial_device_display_name,
+ "last_seen": self._clock.time_msec(),
"hidden": False,
},
desc="store_device",
@@ -1636,7 +1701,7 @@ class DeviceStore(DeviceWorkerStore, DeviceBackgroundUpdateStore):
)
raise StoreError(500, "Problem storing device.")
- async def delete_devices(self, user_id: str, device_ids: List[str]) -> None:
+ async def delete_devices(self, user_id: str, device_ids: Collection[str]) -> None:
"""Deletes several devices.
Args:
|
