Expose statistics on extrems to prometheus (#5384)

tests/unittest.py

@@ -27,11 +27,12 @@ import twisted.logger
 from twisted.internet.defer import Deferred
 from twisted.trial import unittest
 
+from synapse.api.constants import EventTypes
 from synapse.config.homeserver import HomeServerConfig
 from synapse.http.server import JsonResource
 from synapse.http.site import SynapseRequest
 from synapse.server import HomeServer
-from synapse.types import UserID, create_requester
+from synapse.types import Requester, UserID, create_requester
 from synapse.util.logcontext import LoggingContext
 
 from tests.server import get_clock, make_request, render, setup_test_homeserver
@@ -442,6 +443,64 @@ class HomeserverTestCase(TestCase):
         access_token = channel.json_body["access_token"]
         return access_token
 
+    def create_and_send_event(
+        self, room_id, user, soft_failed=False, prev_event_ids=None
+    ):
+        """
+        Create and send an event.
+
+        Args:
+            soft_failed (bool): Whether to create a soft failed event or not
+            prev_event_ids (list[str]|None): Explicitly set the prev events,
+                or if None just use the default
+
+        Returns:
+            str: The new event's ID.
+        """
+        event_creator = self.hs.get_event_creation_handler()
+        secrets = self.hs.get_secrets()
+        requester = Requester(user, None, False, None, None)
+
+        prev_events_and_hashes = None
+        if prev_event_ids:
+            prev_events_and_hashes = [[p, {}, 0] for p in prev_event_ids]
+
+        event, context = self.get_success(
+            event_creator.create_event(
+                requester,
+                {
+                    "type": EventTypes.Message,
+                    "room_id": room_id,
+                    "sender": user.to_string(),
+                    "content": {"body": secrets.token_hex(), "msgtype": "m.text"},
+                },
+                prev_events_and_hashes=prev_events_and_hashes,
+            )
+        )
+
+        if soft_failed:
+            event.internal_metadata.soft_failed = True
+
+        self.get_success(
+            event_creator.send_nonmember_event(requester, event, context)
+        )
+
+        return event.event_id
+
+    def add_extremity(self, room_id, event_id):
+        """
+        Add the given event as an extremity to the room.
+        """
+        self.get_success(
+            self.hs.get_datastore()._simple_insert(
+                table="event_forward_extremities",
+                values={"room_id": room_id, "event_id": event_id},
+                desc="test_add_extremity",
+            )
+        )
+
+        self.hs.get_datastore().get_latest_event_ids_in_room.invalidate((room_id,))
+
     def attempt_wrong_password_login(self, username, password):
         """Attempts to login as the user with the given password, asserting
         that the attempt *fails*.