Revert #7736 (#8039)

4 files changed, 2 insertions, 151 deletions

diff --git a/synapse/storage/databases/main/cache.py b/synapse/storage/databases/main/cache.py
index 683afde52b..10de446065 100644
--- a/synapse/storage/databases/main/cache.py
+++ b/synapse/storage/databases/main/cache.py
@@ -172,7 +172,6 @@ class CacheInvalidationWorkerStore(SQLBaseStore):
 
         self.get_latest_event_ids_in_room.invalidate((room_id,))
 
-        self.get_unread_message_count_for_user.invalidate_many((room_id,))
         self.get_unread_event_push_actions_by_room_for_user.invalidate_many((room_id,))
 
         if not backfilled:
diff --git a/synapse/storage/databases/main/events.py b/synapse/storage/databases/main/events.py
index 4d8a24ce4b..1a68bf32cb 100644
--- a/synapse/storage/databases/main/events.py
+++ b/synapse/storage/databases/main/events.py
@@ -53,47 +53,6 @@ event_counter = Counter(
     ["type", "origin_type", "origin_entity"],
 )
 
-STATE_EVENT_TYPES_TO_MARK_UNREAD = {
-    EventTypes.Topic,
-    EventTypes.Name,
-    EventTypes.RoomAvatar,
-    EventTypes.Tombstone,
-}
-
-
-def should_count_as_unread(event: EventBase, context: EventContext) -> bool:
-    # Exclude rejected and soft-failed events.
-    if context.rejected or event.internal_metadata.is_soft_failed():
-        return False
-
-    # Exclude notices.
-    if (
-        not event.is_state()
-        and event.type == EventTypes.Message
-        and event.content.get("msgtype") == "m.notice"
-    ):
-        return False
-
-    # Exclude edits.
-    relates_to = event.content.get("m.relates_to", {})
-    if relates_to.get("rel_type") == RelationTypes.REPLACE:
-        return False
-
-    # Mark events that have a non-empty string body as unread.
-    body = event.content.get("body")
-    if isinstance(body, str) and body:
-        return True
-
-    # Mark some state events as unread.
-    if event.is_state() and event.type in STATE_EVENT_TYPES_TO_MARK_UNREAD:
-        return True
-
-    # Mark encrypted events as unread.
-    if not event.is_state() and event.type == EventTypes.Encrypted:
-        return True
-
-    return False
-
 
 def encode_json(json_object):
     """
@@ -239,10 +198,6 @@ class PersistEventsStore:
 
                 event_counter.labels(event.type, origin_type, origin_entity).inc()
 
-                self.store.get_unread_message_count_for_user.invalidate_many(
-                    (event.room_id,),
-                )
-
             for room_id, new_state in current_state_for_room.items():
                 self.store.get_current_state_ids.prefill((room_id,), new_state)
 
@@ -864,9 +819,8 @@ class PersistEventsStore:
                     "contains_url": (
                         "url" in event.content and isinstance(event.content["url"], str)
                     ),
-                    "count_as_unread": should_count_as_unread(event, context),
                 }
-                for event, context in events_and_contexts
+                for event, _ in events_and_contexts
             ],
         )
 
diff --git a/synapse/storage/databases/main/events_worker.py b/synapse/storage/databases/main/events_worker.py
index a7b7393f6e..755b7a2a85 100644
--- a/synapse/storage/databases/main/events_worker.py
+++ b/synapse/storage/databases/main/events_worker.py
@@ -41,15 +41,9 @@ from synapse.replication.tcp.streams import BackfillStream
 from synapse.replication.tcp.streams.events import EventsStream
 from synapse.storage._base import SQLBaseStore, db_to_json, make_in_list_sql_clause
 from synapse.storage.database import DatabasePool
-from synapse.storage.types import Cursor
 from synapse.storage.util.id_generators import StreamIdGenerator
 from synapse.types import get_domain_from_id
-from synapse.util.caches.descriptors import (
-    Cache,
-    _CacheContext,
-    cached,
-    cachedInlineCallbacks,
-)
+from synapse.util.caches.descriptors import Cache, cached, cachedInlineCallbacks
 from synapse.util.iterutils import batch_iter
 from synapse.util.metrics import Measure
 
@@ -1364,84 +1358,6 @@ class EventsWorkerStore(SQLBaseStore):
             desc="get_next_event_to_expire", func=get_next_event_to_expire_txn
         )
 
-    @cached(tree=True, cache_context=True)
-    async def get_unread_message_count_for_user(
-        self, room_id: str, user_id: str, cache_context: _CacheContext,
-    ) -> int:
-        """Retrieve the count of unread messages for the given room and user.
-
-        Args:
-            room_id: The ID of the room to count unread messages in.
-            user_id: The ID of the user to count unread messages for.
-
-        Returns:
-            The number of unread messages for the given user in the given room.
-        """
-        with Measure(self._clock, "get_unread_message_count_for_user"):
-            last_read_event_id = await self.get_last_receipt_event_id_for_user(
-                user_id=user_id,
-                room_id=room_id,
-                receipt_type="m.read",
-                on_invalidate=cache_context.invalidate,
-            )
-
-            return await self.db_pool.runInteraction(
-                "get_unread_message_count_for_user",
-                self._get_unread_message_count_for_user_txn,
-                user_id,
-                room_id,
-                last_read_event_id,
-            )
-
-    def _get_unread_message_count_for_user_txn(
-        self,
-        txn: Cursor,
-        user_id: str,
-        room_id: str,
-        last_read_event_id: Optional[str],
-    ) -> int:
-        if last_read_event_id:
-            # Get the stream ordering for the last read event.
-            stream_ordering = self.db_pool.simple_select_one_onecol_txn(
-                txn=txn,
-                table="events",
-                keyvalues={"room_id": room_id, "event_id": last_read_event_id},
-                retcol="stream_ordering",
-            )
-        else:
-            # If there's no read receipt for that room, it probably means the user hasn't
-            # opened it yet, in which case use the stream ID of their join event.
-            # We can't just set it to 0 otherwise messages from other local users from
-            # before this user joined will be counted as well.
-            txn.execute(
-                """
-                SELECT stream_ordering FROM local_current_membership
-                LEFT JOIN events USING (event_id, room_id)
-                WHERE membership = 'join'
-                    AND user_id = ?
-                    AND room_id = ?
-                """,
-                (user_id, room_id),
-            )
-            row = txn.fetchone()
-
-            if row is None:
-                return 0
-
-            stream_ordering = row[0]
-
-        # Count the messages that qualify as unread after the stream ordering we've just
-        # retrieved.
-        sql = """
-            SELECT COUNT(*) FROM events
-            WHERE sender != ? AND room_id = ? AND stream_ordering > ? AND count_as_unread
-        """
-
-        txn.execute(sql, (user_id, room_id, stream_ordering))
-        row = txn.fetchone()
-
-        return row[0] if row else 0
-
 
 AllNewEventsResult = namedtuple(
     "AllNewEventsResult",
diff --git a/synapse/storage/databases/main/schema/delta/58/12unread_messages.sql b/synapse/storage/databases/main/schema/delta/58/12unread_messages.sql
deleted file mode 100644
index 531b532c73..0000000000
--- a/synapse/storage/databases/main/schema/delta/58/12unread_messages.sql
+++ /dev/null
@@ -1,18 +0,0 @@
-/* Copyright 2020 The Matrix.org Foundation C.I.C
- *
- * 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.
- */
-
--- Store a boolean value in the events table for whether the event should be counted in
--- the unread_count property of sync responses.
-ALTER TABLE events ADD COLUMN count_as_unread BOOLEAN;