Fix cache invalidation so deleting access tokens (which we did when changing password) actually takes effect without HS restart. Reinstate the code to avoid logging out the session that changed the password, removed in 415c2f0549

synapse/storage/registration.py

@@ -208,14 +208,26 @@ class RegistrationStore(SQLBaseStore):
         )
 
     @defer.inlineCallbacks
-    def flush_user(self, user_id):
-        rows = yield self._execute(
-            'flush_user', None,
-            "SELECT token FROM access_tokens WHERE user_id = ?",
-            user_id
-        )
-        for r in rows:
-            self.get_user_by_access_token.invalidate((r,))
+    def user_delete_access_tokens_except(self, user_id, except_token_ids):
+        def f(txn):
+            txn.execute(
+                "SELECT id, token FROM access_tokens WHERE user_id = ? LIMIT 50",
+                    (user_id,)
+            )
+            rows = txn.fetchall()
+            for r in rows:
+                if r[0] in except_token_ids:
+                    continue
+
+                txn.call_after(self.get_user_by_access_token.invalidate, (r[1],))
+            txn.execute(
+                "DELETE FROM access_tokens WHERE id in (%s)" % ",".join(
+                    ["?" for _ in rows]
+                ), [r[0] for r in rows]
+            )
+            return len(rows) == 50
+        while (yield self.runInteraction("user_delete_access_tokens_except", f)):
+            pass
 
     @cached()
     def get_user_by_access_token(self, token):