Reduce the amount of state we pull from the DB (#12811)

Author: erikjohnston

changelog.d/12811.misc

@@ -0,0 +1 @@
+Reduce the amount of state we pull from the DB.

synapse/api/auth.py

@@ -29,12 +29,11 @@
     MissingClientTokenError,
 )
 from synapse.appservice import ApplicationService
-from synapse.events import EventBase
 from synapse.http import get_request_user_agent
 from synapse.http.site import SynapseRequest
 from synapse.logging.opentracing import active_span, force_tracing, start_active_span
 from synapse.storage.databases.main.registration import TokenLookupResult
-from synapse.types import Requester, StateMap, UserID, create_requester
+from synapse.types import Requester, UserID, create_requester
 from synapse.util.caches.lrucache import LruCache
 from synapse.util.macaroons import get_value_from_macaroon, satisfy_expiry
 
@@ -61,8 +60,8 @@ def __init__(self, hs: "HomeServer"):
         self.hs = hs
         self.clock = hs.get_clock()
         self.store = hs.get_datastores().main
-        self.state = hs.get_state_handler()
         self._account_validity_handler = hs.get_account_validity_handler()
+        self._storage_controllers = hs.get_storage_controllers()
 
         self.token_cache: LruCache[str, Tuple[str, bool]] = LruCache(
             10000, "token_cache"
@@ -79,9 +78,8 @@ async def check_user_in_room(
         self,
         room_id: str,
         user_id: str,
-        current_state: Optional[StateMap[EventBase]] = None,
         allow_departed_users: bool = False,
-    ) -> EventBase:
+    ) -> Tuple[str, Optional[str]]:
         """Check if the user is in the room, or was at some point.
         Args:
             room_id: The room to check.
@@ -99,29 +97,28 @@ async def check_user_in_room(
         Raises:
             AuthError if the user is/was not in the room.
         Returns:
-            Membership event for the user if the user was in the
-            room. This will be the join event if they are currently joined to
-            the room. This will be the leave event if they have left the room.
+            The current membership of the user in the room and the
+            membership event ID of the user.
         """
-        if current_state:
-            member = current_state.get((EventTypes.Member, user_id), None)
-        else:
-            member = await self.state.get_current_state(
-                room_id=room_id, event_type=EventTypes.Member, state_key=user_id
-            )
 
-        if member:
-            membership = member.membership
+        (
+            membership,
+            member_event_id,
+        ) = await self.store.get_local_current_membership_for_user_in_room(
+            user_id=user_id,
+            room_id=room_id,
+        )
 
+        if membership:
             if membership == Membership.JOIN:
-                return member
+                return membership, member_event_id
 
             # XXX this looks totally bogus. Why do we not allow users who have been banned,
             # or those who were members previously and have been re-invited?
             if allow_departed_users and membership == Membership.LEAVE:
                 forgot = await self.store.did_forget(user_id, room_id)
                 if not forgot:
-                    return member
+                    return membership, member_event_id
 
         raise AuthError(403, "User %s not in room %s" % (user_id, room_id))
 
@@ -602,8 +599,11 @@ async def check_can_change_room_list(self, room_id: str, user: UserID) -> bool:
         # We currently require the user is a "moderator" in the room. We do this
         # by checking if they would (theoretically) be able to change the
         # m.room.canonical_alias events
-        power_level_event = await self.state.get_current_state(
-            room_id, EventTypes.PowerLevels, ""
+
+        power_level_event = (
+            await self._storage_controllers.state.get_current_state_event(
+                room_id, EventTypes.PowerLevels, ""
+            )
         )
 
         auth_events = {}
@@ -693,12 +693,11 @@ async def check_user_in_room_or_world_readable(
             #  * The user is a non-guest user, and was ever in the room
             #  * The user is a guest user, and has joined the room
             # else it will throw.
-            member_event = await self.check_user_in_room(
+            return await self.check_user_in_room(
                 room_id, user_id, allow_departed_users=allow_departed_users
             )
-            return member_event.membership, member_event.event_id
         except AuthError:
-            visibility = await self.state.get_current_state(
+            visibility = await self._storage_controllers.state.get_current_state_event(
                 room_id, EventTypes.RoomHistoryVisibility, ""
             )
             if (

synapse/federation/federation_base.py

@@ -53,6 +53,7 @@ def __init__(self, hs: "HomeServer"):
         self.spam_checker = hs.get_spam_checker()
         self.store = hs.get_datastores().main
         self._clock = hs.get_clock()
+        self._storage_controllers = hs.get_storage_controllers()
 
     async def _check_sigs_and_hash(
         self, room_version: RoomVersion, pdu: EventBase

synapse/federation/federation_server.py

@@ -1223,14 +1223,10 @@ async def check_server_matches_acl(self, server_name: str, room_id: str) -> None
         Raises:
             AuthError if the server does not match the ACL
         """
-        state_ids = await self._state_storage_controller.get_current_state_ids(room_id)
-        acl_event_id = state_ids.get((EventTypes.ServerACL, ""))
-
-        if not acl_event_id:
-            return
-
-        acl_event = await self.store.get_event(acl_event_id)
-        if server_matches_acl_event(server_name, acl_event):
+        acl_event = await self._storage_controllers.state.get_current_state_event(
+            room_id, EventTypes.ServerACL, ""
+        )
+        if not acl_event or server_matches_acl_event(server_name, acl_event):
             return
 
         raise AuthError(code=403, msg="Server is banned from room")

synapse/handlers/directory.py

@@ -320,7 +320,7 @@ async def _update_canonical_alias(
         Raises:
             ShadowBanError if the requester has been shadow-banned.
         """
-        alias_event = await self.state.get_current_state(
+        alias_event = await self._storage_controllers.state.get_current_state_event(
             room_id, EventTypes.CanonicalAlias, ""
         )
 

synapse/handlers/federation.py

@@ -371,7 +371,7 @@ async def _maybe_backfill_inner(
         # First we try hosts that are already in the room
         # TODO: HEURISTIC ALERT.
 
-        curr_state = await self.state_handler.get_current_state(room_id)
+        curr_state = await self._storage_controllers.state.get_current_state(room_id)
 
         curr_domains = get_domains_from_state(curr_state)
 

synapse/handlers/federation_event.py

@@ -1584,9 +1584,11 @@ async def _maybe_kick_guest_users(self, event: EventBase) -> None:
         if guest_access == GuestAccess.CAN_JOIN:
             return
 
-        current_state_map = await self._state_handler.get_current_state(event.room_id)
-        current_state = list(current_state_map.values())
-        await self._get_room_member_handler().kick_guest_users(current_state)
+        current_state = await self._storage_controllers.state.get_current_state(
+            event.room_id
+        )
+        current_state_list = list(current_state.values())
+        await self._get_room_member_handler().kick_guest_users(current_state_list)
 
     async def _check_for_soft_fail(
         self,
@@ -1614,6 +1616,9 @@ async def _check_for_soft_fail(
         room_version = await self._store.get_room_version_id(event.room_id)
         room_version_obj = KNOWN_ROOM_VERSIONS[room_version]
 
+        # The event types we want to pull from the "current" state.
+        auth_types = auth_types_for_event(room_version_obj, event)
+
         # Calculate the "current state".
         if state_ids is not None:
             # If we're explicitly given the state then we won't have all the
@@ -1643,8 +1648,10 @@ async def _check_for_soft_fail(
                 )
             )
         else:
-            current_state_ids = await self._state_handler.get_current_state_ids(
-                event.room_id, latest_event_ids=extrem_ids
+            current_state_ids = (
+                await self._state_storage_controller.get_current_state_ids(
+                    event.room_id, StateFilter.from_types(auth_types)
+                )
             )
 
         logger.debug(
@@ -1654,7 +1661,6 @@ async def _check_for_soft_fail(
         )
 
         # Now check if event pass auth against said current state
-        auth_types = auth_types_for_event(room_version_obj, event)
         current_state_ids_list = [
             e for k, e in current_state_ids.items() if k in auth_types
         ]

synapse/handlers/initial_sync.py

@@ -190,7 +190,7 @@ async def handle_room(event: RoomsForUser) -> None:
                 if event.membership == Membership.JOIN:
                     room_end_token = now_token.room_key
                     deferred_room_state = run_in_background(
-                        self.state_handler.get_current_state, event.room_id
+                        self._state_storage_controller.get_current_state, event.room_id
                     )
                 elif event.membership == Membership.LEAVE:
                     room_end_token = RoomStreamToken(
@@ -407,7 +407,9 @@ async def _room_initial_sync_joined(
         membership: str,
         is_peeking: bool,
     ) -> JsonDict:
-        current_state = await self.state.get_current_state(room_id=room_id)
+        current_state = await self._storage_controllers.state.get_current_state(
+            room_id=room_id
+        )
 
         # TODO: These concurrently
         time_now = self.clock.time_msec()

synapse/handlers/message.py

@@ -125,7 +125,9 @@ async def get_room_data(
         )
 
         if membership == Membership.JOIN:
-            data = await self.state.get_current_state(room_id, event_type, state_key)
+            data = await self._storage_controllers.state.get_current_state_event(
+                room_id, event_type, state_key
+            )
         elif membership == Membership.LEAVE:
             key = (event_type, state_key)
             # If the membership is not JOIN, then the event ID should exist.

synapse/handlers/room.py

@@ -1333,6 +1333,7 @@ def __init__(self, hs: "HomeServer"):
         self.store = hs.get_datastores().main
         self.state_handler = hs.get_state_handler()
         self.federation_client = hs.get_federation_client()
+        self._storage_controllers = hs.get_storage_controllers()
 
     async def get_event_for_timestamp(
         self,
@@ -1406,7 +1407,9 @@ async def get_event_for_timestamp(
             )
 
             # Find other homeservers from the given state in the room
-            curr_state = await self.state_handler.get_current_state(room_id)
+            curr_state = await self._storage_controllers.state.get_current_state(
+                room_id
+            )
             curr_domains = get_domains_from_state(curr_state)
             likely_domains = [
                 domain for domain, depth in curr_domains if domain != self.server_name