diff --git a/synapse/storage/events_worker.py b/synapse/storage/events_worker.py
index 21b353cad3..b56c83e460 100644
--- a/synapse/storage/events_worker.py
+++ b/synapse/storage/events_worker.py
@@ -13,6 +13,8 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+from __future__ import division
+
import itertools
import logging
from collections import namedtuple
@@ -614,7 +616,7 @@ class EventsWorkerStore(SQLBaseStore):
def _get_total_state_event_counts_txn(self, txn, room_id):
"""
- See get_state_event_counts.
+ See get_total_state_event_counts.
"""
sql = "SELECT COUNT(*) FROM state_events WHERE room_id=?"
txn.execute(sql, (room_id,))
@@ -635,3 +637,49 @@ class EventsWorkerStore(SQLBaseStore):
"get_total_state_event_counts",
self._get_total_state_event_counts_txn, room_id
)
+
+ def _get_current_state_event_counts_txn(self, txn, room_id):
+ """
+ See get_current_state_event_counts.
+ """
+ sql = "SELECT COUNT(*) FROM current_state_events WHERE room_id=?"
+ txn.execute(sql, (room_id,))
+ row = txn.fetchone()
+ return row[0] if row else 0
+
+ def get_current_state_event_counts(self, room_id):
+ """
+ Gets the current number of state events in a room.
+
+ Args:
+ room_id (str)
+
+ Returns:
+ Deferred[int]
+ """
+ return self.runInteraction(
+ "get_current_state_event_counts",
+ self._get_current_state_event_counts_txn, room_id
+ )
+
+ @defer.inlineCallbacks
+ def get_room_complexity(self, room_id):
+ """
+ Get a rough approximation of the complexity of the room. This is used by
+ remote servers to decide whether they wish to join the room or not.
+ Higher complexity value indicates that being in the room will consume
+ more resources.
+
+ Args:
+ room_id (str)
+
+ Returns:
+ Deferred[dict[str:int]] of complexity version to complexity.
+ """
+ state_events = yield self.get_current_state_event_counts(room_id)
+
+ # Call this one "v1", so we can introduce new ones as we want to develop
+ # it.
+ complexity_v1 = round(state_events / 500, 2)
+
+ defer.returnValue({"v1": complexity_v1})
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