Rip out auth-event reconciliation code

This code attempts to update our reconcile our state with the remote's auth
events. The spec says nothing about this, and it doesn't really seem like the
right thing to do.

Author: richvdh

synapse/handlers/federation_event.py

@@ -1539,39 +1539,9 @@ async def _check_event_auth(
         calculated_auth_events = await self._store.get_events_as_list(
             calculated_auth_event_ids
         )
-        calculated_auth_event_map = {
-            (e.type, e.state_key): e for e in calculated_auth_events
-        }
 
         try:
-            updated_auth_events = await self._update_auth_events_for_auth(
-                event,
-                calculated_auth_event_map=calculated_auth_event_map,
-            )
-        except Exception:
-            # We don't really mind if the above fails, so lets not fail
-            # processing if it does. However, it really shouldn't fail so
-            # let's still log as an exception since we'll still want to fix
-            # any bugs.
-            logger.exception(
-                "Failed to double check auth events for %s with remote. "
-                "Ignoring failure and continuing processing of event.",
-                event.event_id,
-            )
-            updated_auth_events = None
-
-        if updated_auth_events:
-            context = await self._update_context_for_auth_events(
-                event, context, updated_auth_events
-            )
-            auth_events_for_auth = updated_auth_events
-        else:
-            auth_events_for_auth = calculated_auth_event_map
-
-        try:
-            check_auth_rules_for_event(
-                room_version_obj, event, auth_events_for_auth.values()
-            )
+            check_auth_rules_for_event(room_version_obj, event, calculated_auth_events)
         except AuthError as e:
             logger.warning("Failed auth resolution for %r because %s", event, e)
             context.rejected = RejectedReason.AUTH_ERROR
@@ -1687,93 +1657,6 @@ async def _check_for_soft_fail(
             soft_failed_event_counter.inc()
             event.internal_metadata.soft_failed = True
 
-    async def _update_auth_events_for_auth(
-        self,
-        event: EventBase,
-        calculated_auth_event_map: StateMap[EventBase],
-    ) -> Optional[StateMap[EventBase]]:
-        """Helper for _check_event_auth. See there for docs.
-
-        Checks whether a given event has the expected auth events. If it
-        doesn't then we talk to the remote server to compare state to see if
-        we can come to a consensus (e.g. if one server missed some valid
-        state).
-
-        This attempts to resolve any potential divergence of state between
-        servers, but is not essential and so failures should not block further
-        processing of the event.
-
-        Args:
-            event:
-
-            calculated_auth_event_map:
-                Our calculated auth_events based on the state of the room
-                at the event's position in the DAG.
-
-        Returns:
-            updated auth event map, or None if no changes are needed.
-
-        """
-        assert not event.internal_metadata.outlier
-
-        # check for events which are in the event's claimed auth_events, but not
-        # in our calculated event map.
-        event_auth_events = set(event.auth_event_ids())
-        different_auth = event_auth_events.difference(
-            e.event_id for e in calculated_auth_event_map.values()
-        )
-
-        if not different_auth:
-            return None
-
-        logger.info(
-            "auth_events refers to events which are not in our calculated auth "
-            "chain: %s",
-            different_auth,
-        )
-
-        # XXX: currently this checks for redactions but I'm not convinced that is
-        # necessary?
-        different_events = await self._store.get_events_as_list(different_auth)
-
-        # double-check they're all in the same room - we should already have checked
-        # this but it doesn't hurt to check again.
-        for d in different_events:
-            assert (
-                d.room_id == event.room_id
-            ), f"Event {event.event_id} refers to auth_event {d.event_id} which is in a different room"
-
-        # now we state-resolve between our own idea of the auth events, and the remote's
-        # idea of them.
-
-        local_state = calculated_auth_event_map.values()
-        remote_auth_events = dict(calculated_auth_event_map)
-        remote_auth_events.update({(d.type, d.state_key): d for d in different_events})
-        remote_state = remote_auth_events.values()
-
-        room_version = await self._store.get_room_version_id(event.room_id)
-        new_state = await self._state_handler.resolve_events(
-            room_version, (local_state, remote_state), event
-        )
-        different_state = {
-            (d.type, d.state_key): d
-            for d in new_state.values()
-            if calculated_auth_event_map.get((d.type, d.state_key)) != d
-        }
-        if not different_state:
-            logger.info("State res returned no new state")
-            return None
-
-        logger.info(
-            "After state res: updating auth_events with new state %s",
-            different_state.values(),
-        )
-
-        # take a copy of calculated_auth_event_map before we modify it.
-        auth_events = dict(calculated_auth_event_map)
-        auth_events.update(different_state)
-        return auth_events
-
     async def _load_or_fetch_auth_events_for_event(
         self, destination: str, event: EventBase
     ) -> Collection[EventBase]:
@@ -1871,61 +1754,6 @@ async def _get_remote_auth_chain_for_event(
 
         await self._auth_and_persist_outliers(room_id, remote_auth_events)
 
-    async def _update_context_for_auth_events(
-        self, event: EventBase, context: EventContext, auth_events: StateMap[EventBase]
-    ) -> EventContext:
-        """Update the state_ids in an event context after auth event resolution,
-        storing the changes as a new state group.
-
-        Args:
-            event: The event we're handling the context for
-
-            context: initial event context
-
-            auth_events: Events to update in the event context.
-
-        Returns:
-            new event context
-        """
-        # exclude the state key of the new event from the current_state in the context.
-        if event.is_state():
-            event_key: Optional[Tuple[str, str]] = (event.type, event.state_key)
-        else:
-            event_key = None
-        state_updates = {
-            k: a.event_id for k, a in auth_events.items() if k != event_key
-        }
-
-        current_state_ids = await context.get_current_state_ids()
-        current_state_ids = dict(current_state_ids)  # type: ignore
-
-        current_state_ids.update(state_updates)
-
-        prev_state_ids = await context.get_prev_state_ids()
-        prev_state_ids = dict(prev_state_ids)
-
-        prev_state_ids.update({k: a.event_id for k, a in auth_events.items()})
-
-        # create a new state group as a delta from the existing one.
-        prev_group = context.state_group
-        state_group = await self._state_storage_controller.store_state_group(
-            event.event_id,
-            event.room_id,
-            prev_group=prev_group,
-            delta_ids=state_updates,
-            current_state_ids=current_state_ids,
-        )
-
-        return EventContext.with_state(
-            storage=self._storage_controllers,
-            state_group=state_group,
-            state_group_before_event=context.state_group_before_event,
-            state_delta_due_to_event=state_updates,
-            prev_group=prev_group,
-            delta_ids=state_updates,
-            partial_state=context.partial_state,
-        )
-
     async def _run_push_actions_and_persist_event(
         self, event: EventBase, context: EventContext, backfilled: bool = False
     ) -> None: