779 lines
26 KiB
Python
779 lines
26 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2019 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from synapse.rest import admin
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from synapse.rest.client.v1 import login, room
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from synapse.storage.databases.main import stats
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from tests import unittest
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# The expected number of state events in a fresh public room.
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EXPT_NUM_STATE_EVTS_IN_FRESH_PUBLIC_ROOM = 5
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# The expected number of state events in a fresh private room.
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EXPT_NUM_STATE_EVTS_IN_FRESH_PRIVATE_ROOM = 6
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class StatsRoomTests(unittest.HomeserverTestCase):
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servlets = [
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admin.register_servlets_for_client_rest_resource,
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room.register_servlets,
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login.register_servlets,
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]
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def prepare(self, reactor, clock, hs):
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self.store = hs.get_datastore()
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self.handler = self.hs.get_stats_handler()
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def _add_background_updates(self):
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"""
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Add the background updates we need to run.
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"""
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# Ugh, have to reset this flag
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self.store.db_pool.updates._all_done = False
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self.get_success(
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self.store.db_pool.simple_insert(
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"background_updates",
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{"update_name": "populate_stats_prepare", "progress_json": "{}"},
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)
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)
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self.get_success(
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self.store.db_pool.simple_insert(
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"background_updates",
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{
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"update_name": "populate_stats_process_rooms",
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"progress_json": "{}",
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"depends_on": "populate_stats_prepare",
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},
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)
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)
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self.get_success(
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self.store.db_pool.simple_insert(
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"background_updates",
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{
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"update_name": "populate_stats_process_users",
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"progress_json": "{}",
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"depends_on": "populate_stats_process_rooms",
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},
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)
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)
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self.get_success(
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self.store.db_pool.simple_insert(
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"background_updates",
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{
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"update_name": "populate_stats_cleanup",
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"progress_json": "{}",
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"depends_on": "populate_stats_process_users",
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},
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)
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)
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async def get_all_room_state(self):
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return await self.store.db_pool.simple_select_list(
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"room_stats_state", None, retcols=("name", "topic", "canonical_alias")
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)
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def _get_current_stats(self, stats_type, stat_id):
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table, id_col = stats.TYPE_TO_TABLE[stats_type]
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cols = list(stats.ABSOLUTE_STATS_FIELDS[stats_type]) + list(
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stats.PER_SLICE_FIELDS[stats_type]
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)
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end_ts = self.store.quantise_stats_time(self.reactor.seconds() * 1000)
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return self.get_success(
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self.store.db_pool.simple_select_one(
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table + "_historical",
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{id_col: stat_id, end_ts: end_ts},
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cols,
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allow_none=True,
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)
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)
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def _perform_background_initial_update(self):
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# Do the initial population of the stats via the background update
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self._add_background_updates()
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while not self.get_success(
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self.store.db_pool.updates.has_completed_background_updates()
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):
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self.get_success(
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self.store.db_pool.updates.do_next_background_update(100), by=0.1
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)
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def test_initial_room(self):
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"""
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The background updates will build the table from scratch.
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"""
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r = self.get_success(self.get_all_room_state())
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self.assertEqual(len(r), 0)
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# Disable stats
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self.hs.config.stats_enabled = False
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self.handler.stats_enabled = False
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u1 = self.register_user("u1", "pass")
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u1_token = self.login("u1", "pass")
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room_1 = self.helper.create_room_as(u1, tok=u1_token)
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self.helper.send_state(
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room_1, event_type="m.room.topic", body={"topic": "foo"}, tok=u1_token
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)
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# Stats disabled, shouldn't have done anything
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r = self.get_success(self.get_all_room_state())
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self.assertEqual(len(r), 0)
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# Enable stats
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self.hs.config.stats_enabled = True
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self.handler.stats_enabled = True
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# Do the initial population of the user directory via the background update
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self._add_background_updates()
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while not self.get_success(
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self.store.db_pool.updates.has_completed_background_updates()
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):
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self.get_success(
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self.store.db_pool.updates.do_next_background_update(100), by=0.1
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)
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r = self.get_success(self.get_all_room_state())
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self.assertEqual(len(r), 1)
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self.assertEqual(r[0]["topic"], "foo")
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def test_initial_earliest_token(self):
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"""
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Ingestion via notify_new_event will ignore tokens that the background
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update have already processed.
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"""
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self.reactor.advance(86401)
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self.hs.config.stats_enabled = False
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self.handler.stats_enabled = False
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u1 = self.register_user("u1", "pass")
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u1_token = self.login("u1", "pass")
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u2 = self.register_user("u2", "pass")
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u2_token = self.login("u2", "pass")
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u3 = self.register_user("u3", "pass")
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u3_token = self.login("u3", "pass")
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room_1 = self.helper.create_room_as(u1, tok=u1_token)
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self.helper.send_state(
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room_1, event_type="m.room.topic", body={"topic": "foo"}, tok=u1_token
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)
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# Begin the ingestion by creating the temp tables. This will also store
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# the position that the deltas should begin at, once they take over.
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self.hs.config.stats_enabled = True
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self.handler.stats_enabled = True
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self.store.db_pool.updates._all_done = False
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self.get_success(
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self.store.db_pool.simple_update_one(
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table="stats_incremental_position",
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keyvalues={},
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updatevalues={"stream_id": 0},
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)
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)
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self.get_success(
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self.store.db_pool.simple_insert(
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"background_updates",
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{"update_name": "populate_stats_prepare", "progress_json": "{}"},
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)
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)
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while not self.get_success(
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self.store.db_pool.updates.has_completed_background_updates()
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):
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self.get_success(
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self.store.db_pool.updates.do_next_background_update(100), by=0.1
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)
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# Now, before the table is actually ingested, add some more events.
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self.helper.invite(room=room_1, src=u1, targ=u2, tok=u1_token)
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self.helper.join(room=room_1, user=u2, tok=u2_token)
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# orig_delta_processor = self.store.
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# Now do the initial ingestion.
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self.get_success(
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self.store.db_pool.simple_insert(
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"background_updates",
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{"update_name": "populate_stats_process_rooms", "progress_json": "{}"},
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)
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)
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self.get_success(
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self.store.db_pool.simple_insert(
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"background_updates",
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{
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"update_name": "populate_stats_cleanup",
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"progress_json": "{}",
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"depends_on": "populate_stats_process_rooms",
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},
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)
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)
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self.store.db_pool.updates._all_done = False
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while not self.get_success(
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self.store.db_pool.updates.has_completed_background_updates()
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):
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self.get_success(
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self.store.db_pool.updates.do_next_background_update(100), by=0.1
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)
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self.reactor.advance(86401)
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# Now add some more events, triggering ingestion. Because of the stream
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# position being set to before the events sent in the middle, a simpler
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# implementation would reprocess those events, and say there were four
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# users, not three.
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self.helper.invite(room=room_1, src=u1, targ=u3, tok=u1_token)
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self.helper.join(room=room_1, user=u3, tok=u3_token)
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# self.handler.notify_new_event()
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# We need to let the delta processor advance…
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self.reactor.advance(10 * 60)
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# Get the slices! There should be two -- day 1, and day 2.
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r = self.get_success(self.store.get_statistics_for_subject("room", room_1, 0))
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self.assertEqual(len(r), 2)
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# The oldest has 2 joined members
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self.assertEqual(r[-1]["joined_members"], 2)
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# The newest has 3
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self.assertEqual(r[0]["joined_members"], 3)
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def test_create_user(self):
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"""
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When we create a user, it should have statistics already ready.
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"""
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u1 = self.register_user("u1", "pass")
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u1stats = self._get_current_stats("user", u1)
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self.assertIsNotNone(u1stats)
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# not in any rooms by default
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self.assertEqual(u1stats["joined_rooms"], 0)
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def test_create_room(self):
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"""
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When we create a room, it should have statistics already ready.
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"""
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self._perform_background_initial_update()
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u1 = self.register_user("u1", "pass")
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u1token = self.login("u1", "pass")
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r1 = self.helper.create_room_as(u1, tok=u1token)
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r1stats = self._get_current_stats("room", r1)
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r2 = self.helper.create_room_as(u1, tok=u1token, is_public=False)
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r2stats = self._get_current_stats("room", r2)
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self.assertIsNotNone(r1stats)
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self.assertIsNotNone(r2stats)
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# contains the default things you'd expect in a fresh room
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self.assertEqual(
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r1stats["total_events"],
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EXPT_NUM_STATE_EVTS_IN_FRESH_PUBLIC_ROOM,
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"Wrong number of total_events in new room's stats!"
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" You may need to update this if more state events are added to"
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" the room creation process.",
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)
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self.assertEqual(
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r2stats["total_events"],
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EXPT_NUM_STATE_EVTS_IN_FRESH_PRIVATE_ROOM,
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"Wrong number of total_events in new room's stats!"
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" You may need to update this if more state events are added to"
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" the room creation process.",
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)
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self.assertEqual(
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r1stats["current_state_events"], EXPT_NUM_STATE_EVTS_IN_FRESH_PUBLIC_ROOM
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)
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self.assertEqual(
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r2stats["current_state_events"], EXPT_NUM_STATE_EVTS_IN_FRESH_PRIVATE_ROOM
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)
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self.assertEqual(r1stats["joined_members"], 1)
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self.assertEqual(r1stats["invited_members"], 0)
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self.assertEqual(r1stats["banned_members"], 0)
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self.assertEqual(r2stats["joined_members"], 1)
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self.assertEqual(r2stats["invited_members"], 0)
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self.assertEqual(r2stats["banned_members"], 0)
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def test_send_message_increments_total_events(self):
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"""
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When we send a message, it increments total_events.
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"""
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self._perform_background_initial_update()
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u1 = self.register_user("u1", "pass")
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u1token = self.login("u1", "pass")
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r1 = self.helper.create_room_as(u1, tok=u1token)
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r1stats_ante = self._get_current_stats("room", r1)
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self.helper.send(r1, "hiss", tok=u1token)
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r1stats_post = self._get_current_stats("room", r1)
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self.assertEqual(r1stats_post["total_events"] - r1stats_ante["total_events"], 1)
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def test_updating_profile_information_does_not_increase_joined_members_count(self):
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"""
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Check that the joined_members count does not increase when a user changes their
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profile information (which is done by sending another join membership event into
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the room.
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"""
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self._perform_background_initial_update()
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# Create a user and room
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u1 = self.register_user("u1", "pass")
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u1token = self.login("u1", "pass")
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r1 = self.helper.create_room_as(u1, tok=u1token)
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# Get the current room stats
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r1stats_ante = self._get_current_stats("room", r1)
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# Send a profile update into the room
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new_profile = {"displayname": "bob"}
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self.helper.change_membership(
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r1, u1, u1, "join", extra_data=new_profile, tok=u1token
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)
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# Get the new room stats
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r1stats_post = self._get_current_stats("room", r1)
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# Ensure that the user count did not changed
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self.assertEqual(r1stats_post["joined_members"], r1stats_ante["joined_members"])
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self.assertEqual(
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r1stats_post["local_users_in_room"], r1stats_ante["local_users_in_room"]
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)
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def test_send_state_event_nonoverwriting(self):
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"""
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When we send a non-overwriting state event, it increments total_events AND current_state_events
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"""
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self._perform_background_initial_update()
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u1 = self.register_user("u1", "pass")
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u1token = self.login("u1", "pass")
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r1 = self.helper.create_room_as(u1, tok=u1token)
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self.helper.send_state(
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r1, "cat.hissing", {"value": True}, tok=u1token, state_key="tabby"
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)
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r1stats_ante = self._get_current_stats("room", r1)
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self.helper.send_state(
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r1, "cat.hissing", {"value": False}, tok=u1token, state_key="moggy"
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)
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r1stats_post = self._get_current_stats("room", r1)
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self.assertEqual(r1stats_post["total_events"] - r1stats_ante["total_events"], 1)
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self.assertEqual(
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r1stats_post["current_state_events"] - r1stats_ante["current_state_events"],
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1,
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)
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def test_send_state_event_overwriting(self):
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"""
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When we send an overwriting state event, it increments total_events ONLY
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"""
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self._perform_background_initial_update()
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u1 = self.register_user("u1", "pass")
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u1token = self.login("u1", "pass")
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r1 = self.helper.create_room_as(u1, tok=u1token)
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self.helper.send_state(
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r1, "cat.hissing", {"value": True}, tok=u1token, state_key="tabby"
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)
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r1stats_ante = self._get_current_stats("room", r1)
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self.helper.send_state(
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r1, "cat.hissing", {"value": False}, tok=u1token, state_key="tabby"
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)
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r1stats_post = self._get_current_stats("room", r1)
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self.assertEqual(r1stats_post["total_events"] - r1stats_ante["total_events"], 1)
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self.assertEqual(
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r1stats_post["current_state_events"] - r1stats_ante["current_state_events"],
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0,
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)
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def test_join_first_time(self):
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"""
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When a user joins a room for the first time, total_events, current_state_events and
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joined_members should increase by exactly 1.
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"""
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self._perform_background_initial_update()
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u1 = self.register_user("u1", "pass")
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u1token = self.login("u1", "pass")
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r1 = self.helper.create_room_as(u1, tok=u1token)
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u2 = self.register_user("u2", "pass")
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u2token = self.login("u2", "pass")
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r1stats_ante = self._get_current_stats("room", r1)
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self.helper.join(r1, u2, tok=u2token)
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r1stats_post = self._get_current_stats("room", r1)
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self.assertEqual(r1stats_post["total_events"] - r1stats_ante["total_events"], 1)
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self.assertEqual(
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r1stats_post["current_state_events"] - r1stats_ante["current_state_events"],
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1,
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)
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self.assertEqual(
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r1stats_post["joined_members"] - r1stats_ante["joined_members"], 1
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)
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def test_join_after_leave(self):
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"""
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When a user joins a room after being previously left, total_events and
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joined_members should increase by exactly 1.
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current_state_events should not increase.
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left_members should decrease by exactly 1.
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"""
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self._perform_background_initial_update()
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u1 = self.register_user("u1", "pass")
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u1token = self.login("u1", "pass")
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r1 = self.helper.create_room_as(u1, tok=u1token)
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u2 = self.register_user("u2", "pass")
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u2token = self.login("u2", "pass")
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self.helper.join(r1, u2, tok=u2token)
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self.helper.leave(r1, u2, tok=u2token)
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r1stats_ante = self._get_current_stats("room", r1)
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self.helper.join(r1, u2, tok=u2token)
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r1stats_post = self._get_current_stats("room", r1)
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self.assertEqual(r1stats_post["total_events"] - r1stats_ante["total_events"], 1)
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self.assertEqual(
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r1stats_post["current_state_events"] - r1stats_ante["current_state_events"],
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0,
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)
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self.assertEqual(
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|
r1stats_post["joined_members"] - r1stats_ante["joined_members"], +1
|
|
)
|
|
self.assertEqual(
|
|
r1stats_post["left_members"] - r1stats_ante["left_members"], -1
|
|
)
|
|
|
|
def test_invited(self):
|
|
"""
|
|
When a user invites another user, current_state_events, total_events and
|
|
invited_members should increase by exactly 1.
|
|
"""
|
|
|
|
self._perform_background_initial_update()
|
|
|
|
u1 = self.register_user("u1", "pass")
|
|
u1token = self.login("u1", "pass")
|
|
r1 = self.helper.create_room_as(u1, tok=u1token)
|
|
|
|
u2 = self.register_user("u2", "pass")
|
|
|
|
r1stats_ante = self._get_current_stats("room", r1)
|
|
|
|
self.helper.invite(r1, u1, u2, tok=u1token)
|
|
|
|
r1stats_post = self._get_current_stats("room", r1)
|
|
|
|
self.assertEqual(r1stats_post["total_events"] - r1stats_ante["total_events"], 1)
|
|
self.assertEqual(
|
|
r1stats_post["current_state_events"] - r1stats_ante["current_state_events"],
|
|
1,
|
|
)
|
|
self.assertEqual(
|
|
r1stats_post["invited_members"] - r1stats_ante["invited_members"], +1
|
|
)
|
|
|
|
def test_join_after_invite(self):
|
|
"""
|
|
When a user joins a room after being invited, total_events and
|
|
joined_members should increase by exactly 1.
|
|
current_state_events should not increase.
|
|
invited_members should decrease by exactly 1.
|
|
"""
|
|
|
|
self._perform_background_initial_update()
|
|
|
|
u1 = self.register_user("u1", "pass")
|
|
u1token = self.login("u1", "pass")
|
|
r1 = self.helper.create_room_as(u1, tok=u1token)
|
|
|
|
u2 = self.register_user("u2", "pass")
|
|
u2token = self.login("u2", "pass")
|
|
|
|
self.helper.invite(r1, u1, u2, tok=u1token)
|
|
|
|
r1stats_ante = self._get_current_stats("room", r1)
|
|
|
|
self.helper.join(r1, u2, tok=u2token)
|
|
|
|
r1stats_post = self._get_current_stats("room", r1)
|
|
|
|
self.assertEqual(r1stats_post["total_events"] - r1stats_ante["total_events"], 1)
|
|
self.assertEqual(
|
|
r1stats_post["current_state_events"] - r1stats_ante["current_state_events"],
|
|
0,
|
|
)
|
|
self.assertEqual(
|
|
r1stats_post["joined_members"] - r1stats_ante["joined_members"], +1
|
|
)
|
|
self.assertEqual(
|
|
r1stats_post["invited_members"] - r1stats_ante["invited_members"], -1
|
|
)
|
|
|
|
def test_left(self):
|
|
"""
|
|
When a user leaves a room after joining, total_events and
|
|
left_members should increase by exactly 1.
|
|
current_state_events should not increase.
|
|
joined_members should decrease by exactly 1.
|
|
"""
|
|
|
|
self._perform_background_initial_update()
|
|
|
|
u1 = self.register_user("u1", "pass")
|
|
u1token = self.login("u1", "pass")
|
|
r1 = self.helper.create_room_as(u1, tok=u1token)
|
|
|
|
u2 = self.register_user("u2", "pass")
|
|
u2token = self.login("u2", "pass")
|
|
|
|
self.helper.join(r1, u2, tok=u2token)
|
|
|
|
r1stats_ante = self._get_current_stats("room", r1)
|
|
|
|
self.helper.leave(r1, u2, tok=u2token)
|
|
|
|
r1stats_post = self._get_current_stats("room", r1)
|
|
|
|
self.assertEqual(r1stats_post["total_events"] - r1stats_ante["total_events"], 1)
|
|
self.assertEqual(
|
|
r1stats_post["current_state_events"] - r1stats_ante["current_state_events"],
|
|
0,
|
|
)
|
|
self.assertEqual(
|
|
r1stats_post["left_members"] - r1stats_ante["left_members"], +1
|
|
)
|
|
self.assertEqual(
|
|
r1stats_post["joined_members"] - r1stats_ante["joined_members"], -1
|
|
)
|
|
|
|
def test_banned(self):
|
|
"""
|
|
When a user is banned from a room after joining, total_events and
|
|
left_members should increase by exactly 1.
|
|
current_state_events should not increase.
|
|
banned_members should decrease by exactly 1.
|
|
"""
|
|
|
|
self._perform_background_initial_update()
|
|
|
|
u1 = self.register_user("u1", "pass")
|
|
u1token = self.login("u1", "pass")
|
|
r1 = self.helper.create_room_as(u1, tok=u1token)
|
|
|
|
u2 = self.register_user("u2", "pass")
|
|
u2token = self.login("u2", "pass")
|
|
|
|
self.helper.join(r1, u2, tok=u2token)
|
|
|
|
r1stats_ante = self._get_current_stats("room", r1)
|
|
|
|
self.helper.change_membership(r1, u1, u2, "ban", tok=u1token)
|
|
|
|
r1stats_post = self._get_current_stats("room", r1)
|
|
|
|
self.assertEqual(r1stats_post["total_events"] - r1stats_ante["total_events"], 1)
|
|
self.assertEqual(
|
|
r1stats_post["current_state_events"] - r1stats_ante["current_state_events"],
|
|
0,
|
|
)
|
|
self.assertEqual(
|
|
r1stats_post["banned_members"] - r1stats_ante["banned_members"], +1
|
|
)
|
|
self.assertEqual(
|
|
r1stats_post["joined_members"] - r1stats_ante["joined_members"], -1
|
|
)
|
|
|
|
def test_initial_background_update(self):
|
|
"""
|
|
Test that statistics can be generated by the initial background update
|
|
handler.
|
|
|
|
This test also tests that stats rows are not created for new subjects
|
|
when stats are disabled. However, it may be desirable to change this
|
|
behaviour eventually to still keep current rows.
|
|
"""
|
|
|
|
self.hs.config.stats_enabled = False
|
|
self.handler.stats_enabled = False
|
|
|
|
u1 = self.register_user("u1", "pass")
|
|
u1token = self.login("u1", "pass")
|
|
r1 = self.helper.create_room_as(u1, tok=u1token)
|
|
|
|
# test that these subjects, which were created during a time of disabled
|
|
# stats, do not have stats.
|
|
self.assertIsNone(self._get_current_stats("room", r1))
|
|
self.assertIsNone(self._get_current_stats("user", u1))
|
|
|
|
self.hs.config.stats_enabled = True
|
|
self.handler.stats_enabled = True
|
|
|
|
self._perform_background_initial_update()
|
|
|
|
r1stats = self._get_current_stats("room", r1)
|
|
u1stats = self._get_current_stats("user", u1)
|
|
|
|
self.assertEqual(r1stats["joined_members"], 1)
|
|
self.assertEqual(
|
|
r1stats["current_state_events"], EXPT_NUM_STATE_EVTS_IN_FRESH_PUBLIC_ROOM
|
|
)
|
|
|
|
self.assertEqual(u1stats["joined_rooms"], 1)
|
|
|
|
def test_incomplete_stats(self):
|
|
"""
|
|
This tests that we track incomplete statistics.
|
|
|
|
We first test that incomplete stats are incrementally generated,
|
|
following the preparation of a background regen.
|
|
|
|
We then test that these incomplete rows are completed by the background
|
|
regen.
|
|
"""
|
|
|
|
u1 = self.register_user("u1", "pass")
|
|
u1token = self.login("u1", "pass")
|
|
u2 = self.register_user("u2", "pass")
|
|
u2token = self.login("u2", "pass")
|
|
u3 = self.register_user("u3", "pass")
|
|
r1 = self.helper.create_room_as(u1, tok=u1token, is_public=False)
|
|
|
|
# preparation stage of the initial background update
|
|
# Ugh, have to reset this flag
|
|
self.store.db_pool.updates._all_done = False
|
|
|
|
self.get_success(
|
|
self.store.db_pool.simple_delete(
|
|
"room_stats_current", {"1": 1}, "test_delete_stats"
|
|
)
|
|
)
|
|
self.get_success(
|
|
self.store.db_pool.simple_delete(
|
|
"user_stats_current", {"1": 1}, "test_delete_stats"
|
|
)
|
|
)
|
|
|
|
self.helper.invite(r1, u1, u2, tok=u1token)
|
|
self.helper.join(r1, u2, tok=u2token)
|
|
self.helper.invite(r1, u1, u3, tok=u1token)
|
|
self.helper.send(r1, "thou shalt yield", tok=u1token)
|
|
|
|
# now do the background updates
|
|
|
|
self.store.db_pool.updates._all_done = False
|
|
self.get_success(
|
|
self.store.db_pool.simple_insert(
|
|
"background_updates",
|
|
{
|
|
"update_name": "populate_stats_process_rooms",
|
|
"progress_json": "{}",
|
|
"depends_on": "populate_stats_prepare",
|
|
},
|
|
)
|
|
)
|
|
self.get_success(
|
|
self.store.db_pool.simple_insert(
|
|
"background_updates",
|
|
{
|
|
"update_name": "populate_stats_process_users",
|
|
"progress_json": "{}",
|
|
"depends_on": "populate_stats_process_rooms",
|
|
},
|
|
)
|
|
)
|
|
self.get_success(
|
|
self.store.db_pool.simple_insert(
|
|
"background_updates",
|
|
{
|
|
"update_name": "populate_stats_cleanup",
|
|
"progress_json": "{}",
|
|
"depends_on": "populate_stats_process_users",
|
|
},
|
|
)
|
|
)
|
|
|
|
while not self.get_success(
|
|
self.store.db_pool.updates.has_completed_background_updates()
|
|
):
|
|
self.get_success(
|
|
self.store.db_pool.updates.do_next_background_update(100), by=0.1
|
|
)
|
|
|
|
r1stats_complete = self._get_current_stats("room", r1)
|
|
u1stats_complete = self._get_current_stats("user", u1)
|
|
u2stats_complete = self._get_current_stats("user", u2)
|
|
|
|
# now we make our assertions
|
|
|
|
# check that _complete rows are complete and correct
|
|
self.assertEqual(r1stats_complete["joined_members"], 2)
|
|
self.assertEqual(r1stats_complete["invited_members"], 1)
|
|
|
|
self.assertEqual(
|
|
r1stats_complete["current_state_events"],
|
|
2 + EXPT_NUM_STATE_EVTS_IN_FRESH_PRIVATE_ROOM,
|
|
)
|
|
|
|
self.assertEqual(u1stats_complete["joined_rooms"], 1)
|
|
self.assertEqual(u2stats_complete["joined_rooms"], 1)
|