Add mau_appservice_trial_days config (#12619)

* Add mau_appservice_trial_days

* Add a test

* Tweaks

* changelog

* Ensure we sync after the delay

* Fix types

* Add config statement

* Fix test

* Reinstate logging that got removed

* Fix feature name

tests/test_mau.py

@@ -14,6 +14,8 @@
 
 """Tests REST events for /rooms paths."""
 
+from typing import List
+
 from synapse.api.constants import APP_SERVICE_REGISTRATION_TYPE, LoginType
 from synapse.api.errors import Codes, HttpResponseException, SynapseError
 from synapse.appservice import ApplicationService
@@ -229,6 +231,78 @@ class TestMauLimit(unittest.HomeserverTestCase):
         self.reactor.advance(100)
         self.assertEqual(2, self.successResultOf(count))
 
+    @override_config(
+        {
+            "mau_trial_days": 3,
+            "mau_appservice_trial_days": {"SomeASID": 1, "AnotherASID": 2},
+        }
+    )
+    def test_as_trial_days(self):
+        user_tokens: List[str] = []
+
+        def advance_time_and_sync():
+            self.reactor.advance(24 * 60 * 61)
+            for token in user_tokens:
+                self.do_sync_for_user(token)
+
+        # Cheekily add an application service that we use to register a new user
+        # with.
+        as_token_1 = "foobartoken1"
+        self.store.services_cache.append(
+            ApplicationService(
+                token=as_token_1,
+                hostname=self.hs.hostname,
+                id="SomeASID",
+                sender="@as_sender_1:test",
+                namespaces={"users": [{"regex": "@as_1.*", "exclusive": True}]},
+            )
+        )
+
+        as_token_2 = "foobartoken2"
+        self.store.services_cache.append(
+            ApplicationService(
+                token=as_token_2,
+                hostname=self.hs.hostname,
+                id="AnotherASID",
+                sender="@as_sender_2:test",
+                namespaces={"users": [{"regex": "@as_2.*", "exclusive": True}]},
+            )
+        )
+
+        user_tokens.append(self.create_user("kermit1"))
+        user_tokens.append(self.create_user("kermit2"))
+        user_tokens.append(
+            self.create_user("as_1kermit3", token=as_token_1, appservice=True)
+        )
+        user_tokens.append(
+            self.create_user("as_2kermit4", token=as_token_2, appservice=True)
+        )
+
+        # Advance time by 1 day to include the first appservice
+        advance_time_and_sync()
+        self.assertEqual(
+            self.get_success(self.store.get_monthly_active_count_by_service()),
+            {"SomeASID": 1},
+        )
+
+        # Advance time by 1 day to include the next appservice
+        advance_time_and_sync()
+        self.assertEqual(
+            self.get_success(self.store.get_monthly_active_count_by_service()),
+            {"SomeASID": 1, "AnotherASID": 1},
+        )
+
+        # Advance time by 1 day to include the native users
+        advance_time_and_sync()
+        self.assertEqual(
+            self.get_success(self.store.get_monthly_active_count_by_service()),
+            {
+                "SomeASID": 1,
+                "AnotherASID": 1,
+                "native": 2,
+            },
+        )
+
     def create_user(self, localpart, token=None, appservice=False):
         request_data = {
             "username": localpart,