Remove unneeded ActionGenerator class. (#12691)

It simply passes through to `BulkPushRuleEvaluator`, which can be
called directly instead.

synapse/push/__init__.py

@@ -43,11 +43,6 @@ The general interaction of the classes are:
         +---------------------------------------------+
                 |
                 v
-        +-----------------+
-        | ActionGenerator |
-        +-----------------+
-                |
-                v
         +-----------------------+     +---------------------------+
         | BulkPushRuleEvaluator |---->| PushRuleEvaluatorForEvent |
         +-----------------------+     +---------------------------+

synapse/push/action_generator.py

@@ -1,48 +0,0 @@
-# Copyright 2015 OpenMarket Ltd
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-import logging
-from typing import TYPE_CHECKING
-
-from synapse.events import EventBase
-from synapse.events.snapshot import EventContext
-from synapse.push.bulk_push_rule_evaluator import BulkPushRuleEvaluator
-from synapse.util.metrics import Measure
-
-if TYPE_CHECKING:
-    from synapse.server import HomeServer
-
-logger = logging.getLogger(__name__)
-
-
-class ActionGenerator:
-    def __init__(self, hs: "HomeServer"):
-        self.clock = hs.get_clock()
-        self.bulk_evaluator = BulkPushRuleEvaluator(hs)
-        # really we want to get all user ids and all profile tags too,
-        # since we want the actions for each profile tag for every user and
-        # also actions for a client with no profile tag for each user.
-        # Currently the event stream doesn't support profile tags on an
-        # event stream, so we just run the rules for a client with no profile
-        # tag (ie. we just need all the users).
-
-    async def handle_push_actions_for_event(
-        self, event: EventBase, context: EventContext
-    ) -> None:
-        if event.internal_metadata.is_outlier():
-            # This can happen due to out of band memberships
-            return
-
-        with Measure(self.clock, "action_for_event_by_user"):
-            await self.bulk_evaluator.action_for_event_by_user(event, context)

synapse/push/bulk_push_rule_evaluator.py

@@ -29,6 +29,7 @@ from synapse.util.async_helpers import Linearizer
 from synapse.util.caches import CacheMetric, register_cache
 from synapse.util.caches.descriptors import lru_cache
 from synapse.util.caches.lrucache import LruCache
+from synapse.util.metrics import measure_func
 
 from .push_rule_evaluator import PushRuleEvaluatorForEvent
 
@@ -105,6 +106,7 @@ class BulkPushRuleEvaluator:
     def __init__(self, hs: "HomeServer"):
         self.hs = hs
         self.store = hs.get_datastores().main
+        self.clock = hs.get_clock()
         self._event_auth_handler = hs.get_event_auth_handler()
 
         # Used by `RulesForRoom` to ensure only one thing mutates the cache at a
@@ -185,6 +187,7 @@ class BulkPushRuleEvaluator:
 
         return pl_event.content if pl_event else {}, sender_level
 
+    @measure_func("action_for_event_by_user")
     async def action_for_event_by_user(
         self, event: EventBase, context: EventContext
     ) -> None:
@@ -192,6 +195,10 @@ class BulkPushRuleEvaluator:
         should increment the unread count, and insert the results into the
         event_push_actions_staging table.
         """
+        if event.internal_metadata.is_outlier():
+            # This can happen due to out of band memberships
+            return
+
         count_as_unread = _should_count_as_unread(event, context)
 
         rules_by_user = await self._get_rules_for_event(event, context)