Make pushers use the event_push_actions table instead of listening on an event stream & running the rules again. Sytest passes, but remaining to do:

* Make badges work again
 * Remove old, unused code

synapse/storage/event_push_actions.py

@@ -100,6 +100,54 @@ class EventPushActionsStore(SQLBaseStore):
         )
         defer.returnValue(ret)
 
+    @defer.inlineCallbacks
+    def get_push_action_users_in_range(self, min_stream_ordering, max_stream_ordering):
+        def f(txn):
+            sql = (
+                "SELECT DISTINCT(user_id) FROM event_push_actions WHERE"
+                " stream_ordering >= ? AND stream_ordering >= ?"
+            )
+            txn.execute(sql, (min_stream_ordering, max_stream_ordering))
+            return [r[0] for r in txn.fetchall()]
+        ret = yield self.runInteraction("get_push_action_users_in_range", f)
+        defer.returnValue(ret)
+
+    @defer.inlineCallbacks
+    def get_unread_push_actions_for_user_in_range(self, user_id,
+                                                  min_stream_ordering,
+                                                  max_stream_ordering=None):
+        def f(txn):
+            sql = (
+                "SELECT event_id, stream_ordering, actions"
+                " FROM event_push_actions"
+                " WHERE user_id = ? AND stream_ordering > ?"
+            )
+            args = [user_id, min_stream_ordering]
+            if max_stream_ordering is not None:
+                sql += " AND stream_ordering <= ?"
+                args.append(max_stream_ordering)
+            sql += " ORDER BY stream_ordering ASC"
+            txn.execute(sql, args)
+            return txn.fetchall()
+        ret = yield self.runInteraction("get_unread_push_actions_for_user_in_range", f)
+        defer.returnValue([
+            {
+                "event_id": row[0],
+                "stream_ordering": row[1],
+                "actions": json.loads(row[2]),
+            } for row in ret
+        ])
+
+    @defer.inlineCallbacks
+    def get_latest_push_action_stream_ordering(self):
+        def f(txn):
+            txn.execute("SELECT MAX(stream_ordering) FROM event_push_actions")
+            return txn.fetchone()
+        result = yield self.runInteraction(
+                "get_latest_push_action_stream_ordering", f
+        )
+        defer.returnValue(result[0] or 0)
+
     def _remove_push_actions_for_event_id_txn(self, txn, room_id, event_id):
         # Sad that we have to blow away the cache for the whole room here
         txn.call_after(