Remove the experimental implementation of MSC3772. (#14094)

MSC3772 has been abandoned.

6 files changed, 7 insertions, 135 deletions

diff --git a/synapse/config/experimental.py b/synapse/config/experimental.py
index e00cb7096c..f44655516e 100644
--- a/synapse/config/experimental.py
+++ b/synapse/config/experimental.py
@@ -95,8 +95,6 @@ class ExperimentalConfig(Config):
         # MSC2815 (allow room moderators to view redacted event content)
         self.msc2815_enabled: bool = experimental.get("msc2815_enabled", False)
 
-        # MSC3772: A push rule for mutual relations.
-        self.msc3772_enabled: bool = experimental.get("msc3772_enabled", False)
         # MSC3773: Thread notifications
         self.msc3773_enabled: bool = experimental.get("msc3773_enabled", False)
 
diff --git a/synapse/push/bulk_push_rule_evaluator.py b/synapse/push/bulk_push_rule_evaluator.py
index eced182fd5..8d94aeaa32 100644
--- a/synapse/push/bulk_push_rule_evaluator.py
+++ b/synapse/push/bulk_push_rule_evaluator.py
@@ -13,18 +13,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import itertools
 import logging
 from typing import (
     TYPE_CHECKING,
     Any,
     Collection,
     Dict,
-    Iterable,
     List,
     Mapping,
     Optional,
-    Set,
     Tuple,
     Union,
 )
@@ -38,7 +35,7 @@ from synapse.events.snapshot import EventContext
 from synapse.state import POWER_KEY
 from synapse.storage.databases.main.roommember import EventIdMembership
 from synapse.storage.state import StateFilter
-from synapse.synapse_rust.push import FilteredPushRules, PushRule, PushRuleEvaluator
+from synapse.synapse_rust.push import FilteredPushRules, PushRuleEvaluator
 from synapse.util.caches import register_cache
 from synapse.util.metrics import measure_func
 from synapse.visibility import filter_event_for_clients_with_state
@@ -117,9 +114,6 @@ class BulkPushRuleEvaluator:
             resizable=False,
         )
 
-        # Whether to support MSC3772 is supported.
-        self._relations_match_enabled = self.hs.config.experimental.msc3772_enabled
-
     async def _get_rules_for_event(
         self,
         event: EventBase,
@@ -200,51 +194,6 @@ class BulkPushRuleEvaluator:
 
         return pl_event.content if pl_event else {}, sender_level
 
-    async def _get_mutual_relations(
-        self, parent_id: str, rules: Iterable[Tuple[PushRule, bool]]
-    ) -> Dict[str, Set[Tuple[str, str]]]:
-        """
-        Fetch event metadata for events which related to the same event as the given event.
-
-        If the given event has no relation information, returns an empty dictionary.
-
-        Args:
-            parent_id: The event ID which is targeted by relations.
-            rules: The push rules which will be processed for this event.
-
-        Returns:
-            A dictionary of relation type to:
-                A set of tuples of:
-                    The sender
-                    The event type
-        """
-
-        # If the experimental feature is not enabled, skip fetching relations.
-        if not self._relations_match_enabled:
-            return {}
-
-        # Pre-filter to figure out which relation types are interesting.
-        rel_types = set()
-        for rule, enabled in rules:
-            if not enabled:
-                continue
-
-            for condition in rule.conditions:
-                if condition["kind"] != "org.matrix.msc3772.relation_match":
-                    continue
-
-                # rel_type is required.
-                rel_type = condition.get("rel_type")
-                if rel_type:
-                    rel_types.add(rel_type)
-
-        # If no valid rules were found, no mutual relations.
-        if not rel_types:
-            return {}
-
-        # If any valid rules were found, fetch the mutual relations.
-        return await self.store.get_mutual_event_relations(parent_id, rel_types)
-
     @measure_func("action_for_event_by_user")
     async def action_for_event_by_user(
         self, event: EventBase, context: EventContext
@@ -276,16 +225,11 @@ class BulkPushRuleEvaluator:
             sender_power_level,
         ) = await self._get_power_levels_and_sender_level(event, context)
 
+        # Find the event's thread ID.
         relation = relation_from_event(event)
-        # If the event does not have a relation, then cannot have any mutual
-        # relations or thread ID.
-        relations = {}
+        # If the event does not have a relation, then it cannot have a thread ID.
         thread_id = MAIN_TIMELINE
         if relation:
-            relations = await self._get_mutual_relations(
-                relation.parent_id,
-                itertools.chain(*(r.rules() for r in rules_by_user.values())),
-            )
             # Recursively attempt to find the thread this event relates to.
             if relation.rel_type == RelationTypes.THREAD:
                 thread_id = relation.parent_id
@@ -306,8 +250,6 @@ class BulkPushRuleEvaluator:
             room_member_count,
             sender_power_level,
             notification_levels,
-            relations,
-            self._relations_match_enabled,
         )
 
         users = rules_by_user.keys()
diff --git a/synapse/storage/databases/main/cache.py b/synapse/storage/databases/main/cache.py
index 3b8ed1f7ee..a9f25a5904 100644
--- a/synapse/storage/databases/main/cache.py
+++ b/synapse/storage/databases/main/cache.py
@@ -259,9 +259,6 @@ class CacheInvalidationWorkerStore(SQLBaseStore):
             self._attempt_to_invalidate_cache("get_applicable_edit", (relates_to,))
             self._attempt_to_invalidate_cache("get_thread_summary", (relates_to,))
             self._attempt_to_invalidate_cache("get_thread_participated", (relates_to,))
-            self._attempt_to_invalidate_cache(
-                "get_mutual_event_relations_for_rel_type", (relates_to,)
-            )
 
     async def invalidate_cache_and_stream(
         self, cache_name: str, keys: Tuple[Any, ...]
diff --git a/synapse/storage/databases/main/events.py b/synapse/storage/databases/main/events.py
index 3e15827986..060fe71454 100644
--- a/synapse/storage/databases/main/events.py
+++ b/synapse/storage/databases/main/events.py
@@ -2024,11 +2024,6 @@ class PersistEventsStore:
             self.store._invalidate_cache_and_stream(
                 txn, self.store.get_thread_participated, (redacted_relates_to,)
             )
-            self.store._invalidate_cache_and_stream(
-                txn,
-                self.store.get_mutual_event_relations_for_rel_type,
-                (redacted_relates_to,),
-            )
 
         self.db_pool.simple_delete_txn(
             txn, table="event_relations", keyvalues={"event_id": redacted_event_id}
diff --git a/synapse/storage/databases/main/push_rule.py b/synapse/storage/databases/main/push_rule.py
index 8295322b0e..51416b2236 100644
--- a/synapse/storage/databases/main/push_rule.py
+++ b/synapse/storage/databases/main/push_rule.py
@@ -29,7 +29,6 @@ from typing import (
 )
 
 from synapse.api.errors import StoreError
-from synapse.config.homeserver import ExperimentalConfig
 from synapse.replication.slave.storage._slaved_id_tracker import SlavedIdTracker
 from synapse.storage._base import SQLBaseStore
 from synapse.storage.database import (
@@ -63,9 +62,7 @@ logger = logging.getLogger(__name__)
 
 
 def _load_rules(
-    rawrules: List[JsonDict],
-    enabled_map: Dict[str, bool],
-    experimental_config: ExperimentalConfig,
+    rawrules: List[JsonDict], enabled_map: Dict[str, bool]
 ) -> FilteredPushRules:
     """Take the DB rows returned from the DB and convert them into a full
     `FilteredPushRules` object.
@@ -83,9 +80,7 @@ def _load_rules(
 
     push_rules = PushRules(ruleslist)
 
-    filtered_rules = FilteredPushRules(
-        push_rules, enabled_map, msc3772_enabled=experimental_config.msc3772_enabled
-    )
+    filtered_rules = FilteredPushRules(push_rules, enabled_map)
 
     return filtered_rules
 
@@ -165,7 +160,7 @@ class PushRulesWorkerStore(
 
         enabled_map = await self.get_push_rules_enabled_for_user(user_id)
 
-        return _load_rules(rows, enabled_map, self.hs.config.experimental)
+        return _load_rules(rows, enabled_map)
 
     async def get_push_rules_enabled_for_user(self, user_id: str) -> Dict[str, bool]:
         results = await self.db_pool.simple_select_list(
@@ -224,9 +219,7 @@ class PushRulesWorkerStore(
         results: Dict[str, FilteredPushRules] = {}
 
         for user_id, rules in raw_rules.items():
-            results[user_id] = _load_rules(
-                rules, enabled_map_by_user.get(user_id, {}), self.hs.config.experimental
-            )
+            results[user_id] = _load_rules(rules, enabled_map_by_user.get(user_id, {}))
 
         return results
 
diff --git a/synapse/storage/databases/main/relations.py b/synapse/storage/databases/main/relations.py
index 116abef9de..6b7eec4bf2 100644
--- a/synapse/storage/databases/main/relations.py
+++ b/synapse/storage/databases/main/relations.py
@@ -776,59 +776,6 @@ class RelationsWorkerStore(SQLBaseStore):
             "get_if_user_has_annotated_event", _get_if_user_has_annotated_event
         )
 
-    @cached(iterable=True)
-    async def get_mutual_event_relations_for_rel_type(
-        self, event_id: str, relation_type: str
-    ) -> Set[Tuple[str, str]]:
-        raise NotImplementedError()
-
-    @cachedList(
-        cached_method_name="get_mutual_event_relations_for_rel_type",
-        list_name="relation_types",
-    )
-    async def get_mutual_event_relations(
-        self, event_id: str, relation_types: Collection[str]
-    ) -> Dict[str, Set[Tuple[str, str]]]:
-        """
-        Fetch event metadata for events which related to the same event as the given event.
-
-        If the given event has no relation information, returns an empty dictionary.
-
-        Args:
-            event_id: The event ID which is targeted by relations.
-            relation_types: The relation types to check for mutual relations.
-
-        Returns:
-            A dictionary of relation type to:
-                A set of tuples of:
-                    The sender
-                    The event type
-        """
-        rel_type_sql, rel_type_args = make_in_list_sql_clause(
-            self.database_engine, "relation_type", relation_types
-        )
-
-        sql = f"""
-            SELECT DISTINCT relation_type, sender, type FROM event_relations
-            INNER JOIN events USING (event_id)
-            WHERE relates_to_id = ? AND {rel_type_sql}
-        """
-
-        def _get_event_relations(
-            txn: LoggingTransaction,
-        ) -> Dict[str, Set[Tuple[str, str]]]:
-            txn.execute(sql, [event_id] + rel_type_args)
-            result: Dict[str, Set[Tuple[str, str]]] = {
-                rel_type: set() for rel_type in relation_types
-            }
-            for rel_type, sender, type in txn.fetchall():
-                result[rel_type].add((sender, type))
-            return result
-
-        return await self.db_pool.runInteraction(
-            "get_event_relations", _get_event_relations
-        )
-
     @cached()
     async def get_thread_id(self, event_id: str) -> Optional[str]:
         """