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242 lines
8.5 KiB
Python
242 lines
8.5 KiB
Python
#
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# This file is licensed under the Affero General Public License (AGPL) version 3.
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#
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# Copyright (C) 2023 New Vector, Ltd
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# See the GNU Affero General Public License for more details:
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# <https://www.gnu.org/licenses/agpl-3.0.html>.
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#
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# Originally licensed under the Apache License, Version 2.0:
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# <http://www.apache.org/licenses/LICENSE-2.0>.
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#
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# [This file includes modifications made by New Vector Limited]
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#
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#
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from unittest import mock
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from synapse.notifier import Notifier
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from synapse.replication.tcp.handler import ReplicationCommandHandler
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from synapse.util.retryutils import NotRetryingDestination, get_retry_limiter
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from tests.unittest import HomeserverTestCase
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class RetryLimiterTestCase(HomeserverTestCase):
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def test_new_destination(self) -> None:
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"""A happy-path case with a new destination and a successful operation"""
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store = self.hs.get_datastores().main
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limiter = self.get_success(get_retry_limiter("test_dest", self.clock, store))
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# advance the clock a bit before making the request
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self.pump(1)
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with limiter:
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pass
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new_timings = self.get_success(store.get_destination_retry_timings("test_dest"))
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self.assertIsNone(new_timings)
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def test_limiter(self) -> None:
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"""General test case which walks through the process of a failing request"""
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store = self.hs.get_datastores().main
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limiter = self.get_success(get_retry_limiter("test_dest", self.clock, store))
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min_retry_interval_ms = (
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self.hs.config.federation.destination_min_retry_interval_ms
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)
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retry_multiplier = self.hs.config.federation.destination_retry_multiplier
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self.pump(1)
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try:
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with limiter:
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self.pump(1)
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failure_ts = self.clock.time_msec()
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raise AssertionError("argh")
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except AssertionError:
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pass
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self.pump()
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new_timings = self.get_success(store.get_destination_retry_timings("test_dest"))
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assert new_timings is not None
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self.assertEqual(new_timings.failure_ts, failure_ts)
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self.assertEqual(new_timings.retry_last_ts, failure_ts)
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self.assertEqual(new_timings.retry_interval, min_retry_interval_ms)
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# now if we try again we should get a failure
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self.get_failure(
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get_retry_limiter("test_dest", self.clock, store), NotRetryingDestination
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)
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#
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# advance the clock and try again
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#
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self.pump(min_retry_interval_ms)
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limiter = self.get_success(get_retry_limiter("test_dest", self.clock, store))
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self.pump(1)
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try:
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with limiter:
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self.pump(1)
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retry_ts = self.clock.time_msec()
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raise AssertionError("argh")
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except AssertionError:
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pass
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self.pump()
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new_timings = self.get_success(store.get_destination_retry_timings("test_dest"))
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assert new_timings is not None
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self.assertEqual(new_timings.failure_ts, failure_ts)
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self.assertEqual(new_timings.retry_last_ts, retry_ts)
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self.assertGreaterEqual(
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new_timings.retry_interval, min_retry_interval_ms * retry_multiplier * 0.5
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)
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self.assertLessEqual(
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new_timings.retry_interval, min_retry_interval_ms * retry_multiplier * 2.0
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)
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#
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# one more go, with success
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#
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self.reactor.advance(min_retry_interval_ms * retry_multiplier * 2.0)
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limiter = self.get_success(get_retry_limiter("test_dest", self.clock, store))
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self.pump(1)
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with limiter:
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self.pump(1)
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# wait for the update to land
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self.pump()
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new_timings = self.get_success(store.get_destination_retry_timings("test_dest"))
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self.assertIsNone(new_timings)
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def test_notifier_replication(self) -> None:
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"""Ensure the notifier/replication client is called only when expected."""
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store = self.hs.get_datastores().main
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notifier = mock.Mock(spec=Notifier)
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replication_client = mock.Mock(spec=ReplicationCommandHandler)
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limiter = self.get_success(
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get_retry_limiter(
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"test_dest",
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self.clock,
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store,
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notifier=notifier,
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replication_client=replication_client,
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)
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)
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# The server is already up, nothing should occur.
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self.pump(1)
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with limiter:
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pass
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self.pump()
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new_timings = self.get_success(store.get_destination_retry_timings("test_dest"))
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self.assertIsNone(new_timings)
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notifier.notify_remote_server_up.assert_not_called()
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replication_client.send_remote_server_up.assert_not_called()
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# Attempt again, but return an error. This will cause new retry timings, but
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# should not trigger server up notifications.
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self.pump(1)
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try:
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with limiter:
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raise AssertionError("argh")
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except AssertionError:
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pass
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self.pump()
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new_timings = self.get_success(store.get_destination_retry_timings("test_dest"))
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# The exact retry timings are tested separately.
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self.assertIsNotNone(new_timings)
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notifier.notify_remote_server_up.assert_not_called()
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replication_client.send_remote_server_up.assert_not_called()
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# A second failing request should be treated as the above.
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self.pump(1)
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try:
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with limiter:
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raise AssertionError("argh")
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except AssertionError:
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pass
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self.pump()
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new_timings = self.get_success(store.get_destination_retry_timings("test_dest"))
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# The exact retry timings are tested separately.
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self.assertIsNotNone(new_timings)
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notifier.notify_remote_server_up.assert_not_called()
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replication_client.send_remote_server_up.assert_not_called()
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# A final successful attempt should generate a server up notification.
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self.pump(1)
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with limiter:
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pass
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self.pump()
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new_timings = self.get_success(store.get_destination_retry_timings("test_dest"))
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# The exact retry timings are tested separately.
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self.assertIsNone(new_timings)
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notifier.notify_remote_server_up.assert_called_once_with("test_dest")
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replication_client.send_remote_server_up.assert_called_once_with("test_dest")
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def test_max_retry_interval(self) -> None:
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"""Test that `destination_max_retry_interval` setting works as expected"""
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store = self.hs.get_datastores().main
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destination_max_retry_interval_ms = (
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self.hs.config.federation.destination_max_retry_interval_ms
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)
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self.get_success(get_retry_limiter("test_dest", self.clock, store))
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self.pump(1)
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failure_ts = self.clock.time_msec()
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# Simulate reaching destination_max_retry_interval
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self.get_success(
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store.set_destination_retry_timings(
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"test_dest",
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failure_ts=failure_ts,
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retry_last_ts=failure_ts,
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retry_interval=destination_max_retry_interval_ms,
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)
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)
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# Check it fails
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self.get_failure(
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get_retry_limiter("test_dest", self.clock, store), NotRetryingDestination
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)
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# Get past retry_interval and we can try again, and still throw an error to continue the backoff
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self.reactor.advance(destination_max_retry_interval_ms / 1000 + 1)
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limiter = self.get_success(get_retry_limiter("test_dest", self.clock, store))
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self.pump(1)
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try:
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with limiter:
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self.pump(1)
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raise AssertionError("argh")
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except AssertionError:
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pass
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self.pump()
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# retry_interval does not increase and stays at destination_max_retry_interval_ms
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new_timings = self.get_success(store.get_destination_retry_timings("test_dest"))
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assert new_timings is not None
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self.assertEqual(new_timings.retry_interval, destination_max_retry_interval_ms)
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# Check it fails
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self.get_failure(
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get_retry_limiter("test_dest", self.clock, store), NotRetryingDestination
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)
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