Add bulk push rule evaluator which actually still evaluates rules one by one, but does far fewer db queries to fetch the rules

synapse/push/bulk_push_rule_evaluator.py

@@ -0,0 +1,99 @@
+# -*- coding: utf-8 -*-
+# 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
+import simplejson as json
+
+from twisted.internet import defer
+
+from synapse.types import UserID
+
+import baserules
+from push_rule_evaluator import PushRuleEvaluator
+
+logger = logging.getLogger(__name__)
+
+
+def decode_rule_json(rule):
+    rule['conditions'] = json.loads(rule['conditions'])
+    rule['actions'] = json.loads(rule['actions'])
+    return rule
+
+
+@defer.inlineCallbacks
+def evaluator_for_room_id(room_id, hs, store):
+    users = yield store.get_users_in_room(room_id)
+    rules_by_user = yield store.bulk_get_push_rules(users)
+    rules_by_user = {
+        uid: baserules.list_with_base_rules(
+            [decode_rule_json(rule_list) for rule_list in rules_by_user[uid]]
+            if uid in rules_by_user else [],
+            UserID.from_string(uid)
+        )
+        for uid in users
+    }
+    member_events = yield store.get_current_state(
+        room_id=room_id,
+        event_type='m.room.member',
+    )
+    display_names = {}
+    for ev in member_events:
+        if ev.content.get("displayname"):
+            display_names[ev.state_key] = ev.content.get("displayname")
+
+    defer.returnValue(BulkPushRuleEvaluator(
+            room_id, rules_by_user, display_names, users
+    ))
+
+
+class BulkPushRuleEvaluator:
+    def __init__(self, room_id, rules_by_user, display_names, users_in_room):
+        self.room_id = room_id
+        self.rules_by_user = rules_by_user
+        self.display_names = display_names
+        self.users_in_room = users_in_room
+
+    def action_for_event_by_user(self, event):
+        actions_by_user = {}
+
+        for uid, rules in self.rules_by_user.items():
+            display_name = None
+            if uid in self.display_names:
+                display_name = self.display_names[uid]
+
+            for rule in rules:
+                if 'enabled' in rule and not rule['enabled']:
+                    continue
+
+                # XXX: profile tags
+                if BulkPushRuleEvaluator.event_matches_rule(
+                    event, rule,
+                    display_name, len(self.users_in_room), None
+                ):
+                    actions = [x for x in rule['actions'] if x != 'dont_notify']
+                    if len(actions) > 0:
+                        actions_by_user[uid] = actions
+                    break
+        return actions_by_user
+
+    @staticmethod
+    def event_matches_rule(event, rule,
+                           display_name, room_member_count, profile_tag):
+        matches = True
+        for cond in rule['conditions']:
+            matches &= PushRuleEvaluator._event_fulfills_condition(
+                event, cond, display_name, room_member_count, profile_tag
+            )
+        return matches