185 lines
7.0 KiB
Python
185 lines
7.0 KiB
Python
# Copyright 2020 The Matrix.org Foundation C.I.C.
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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 typing import Callable, Tuple
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from unittest.mock import Mock, call
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from twisted.internet import defer
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from twisted.internet.defer import CancelledError, Deferred
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from twisted.test.proto_helpers import MemoryReactor
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from synapse.server import HomeServer
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from synapse.storage.database import (
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DatabasePool,
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LoggingTransaction,
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make_tuple_comparison_clause,
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)
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from synapse.util import Clock
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from tests import unittest
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class TupleComparisonClauseTestCase(unittest.TestCase):
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def test_native_tuple_comparison(self) -> None:
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clause, args = make_tuple_comparison_clause([("a", 1), ("b", 2)])
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self.assertEqual(clause, "(a,b) > (?,?)")
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self.assertEqual(args, [1, 2])
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class CallbacksTestCase(unittest.HomeserverTestCase):
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"""Tests for transaction callbacks."""
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def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
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self.store = hs.get_datastores().main
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self.db_pool: DatabasePool = self.store.db_pool
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def _run_interaction(
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self, func: Callable[[LoggingTransaction], object]
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) -> Tuple[Mock, Mock]:
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"""Run the given function in a database transaction, with callbacks registered.
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Args:
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func: The function to be run in a transaction. The transaction will be
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retried if `func` raises an `OperationalError`.
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Returns:
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Two mocks, which were registered as an `after_callback` and an
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`exception_callback` respectively, on every transaction attempt.
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"""
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after_callback = Mock()
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exception_callback = Mock()
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def _test_txn(txn: LoggingTransaction) -> None:
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txn.call_after(after_callback, 123, 456, extra=789)
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txn.call_on_exception(exception_callback, 987, 654, extra=321)
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func(txn)
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try:
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self.get_success_or_raise(
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self.db_pool.runInteraction("test_transaction", _test_txn)
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)
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except Exception:
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pass
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return after_callback, exception_callback
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def test_after_callback(self) -> None:
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"""Test that the after callback is called when a transaction succeeds."""
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after_callback, exception_callback = self._run_interaction(lambda txn: None)
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after_callback.assert_called_once_with(123, 456, extra=789)
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exception_callback.assert_not_called()
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def test_exception_callback(self) -> None:
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"""Test that the exception callback is called when a transaction fails."""
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_test_txn = Mock(side_effect=ZeroDivisionError)
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after_callback, exception_callback = self._run_interaction(_test_txn)
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after_callback.assert_not_called()
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exception_callback.assert_called_once_with(987, 654, extra=321)
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def test_failed_retry(self) -> None:
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"""Test that the exception callback is called for every failed attempt."""
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# Always raise an `OperationalError`.
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_test_txn = Mock(side_effect=self.db_pool.engine.module.OperationalError)
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after_callback, exception_callback = self._run_interaction(_test_txn)
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after_callback.assert_not_called()
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exception_callback.assert_has_calls(
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[
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call(987, 654, extra=321),
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call(987, 654, extra=321),
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call(987, 654, extra=321),
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call(987, 654, extra=321),
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call(987, 654, extra=321),
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call(987, 654, extra=321),
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]
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)
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self.assertEqual(exception_callback.call_count, 6) # no additional calls
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def test_successful_retry(self) -> None:
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"""Test callbacks for a failed transaction followed by a successful attempt."""
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# Raise an `OperationalError` on the first attempt only.
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_test_txn = Mock(
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side_effect=[self.db_pool.engine.module.OperationalError, None]
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)
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after_callback, exception_callback = self._run_interaction(_test_txn)
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# Calling both `after_callback`s when the first attempt failed is rather
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# surprising (#12184). Let's document the behaviour in a test.
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after_callback.assert_has_calls(
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[
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call(123, 456, extra=789),
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call(123, 456, extra=789),
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]
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)
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self.assertEqual(after_callback.call_count, 2) # no additional calls
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exception_callback.assert_not_called()
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class CancellationTestCase(unittest.HomeserverTestCase):
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def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
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self.store = hs.get_datastores().main
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self.db_pool: DatabasePool = self.store.db_pool
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def test_after_callback(self) -> None:
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"""Test that the after callback is called when a transaction succeeds."""
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d: "Deferred[None]"
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after_callback = Mock()
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exception_callback = Mock()
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def _test_txn(txn: LoggingTransaction) -> None:
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txn.call_after(after_callback, 123, 456, extra=789)
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txn.call_on_exception(exception_callback, 987, 654, extra=321)
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d.cancel()
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d = defer.ensureDeferred(
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self.db_pool.runInteraction("test_transaction", _test_txn)
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)
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self.get_failure(d, CancelledError)
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after_callback.assert_called_once_with(123, 456, extra=789)
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exception_callback.assert_not_called()
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def test_exception_callback(self) -> None:
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"""Test that the exception callback is called when a transaction fails."""
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d: "Deferred[None]"
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after_callback = Mock()
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exception_callback = Mock()
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def _test_txn(txn: LoggingTransaction) -> None:
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txn.call_after(after_callback, 123, 456, extra=789)
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txn.call_on_exception(exception_callback, 987, 654, extra=321)
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d.cancel()
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# Simulate a retryable failure on every attempt.
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raise self.db_pool.engine.module.OperationalError()
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d = defer.ensureDeferred(
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self.db_pool.runInteraction("test_transaction", _test_txn)
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)
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self.get_failure(d, CancelledError)
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after_callback.assert_not_called()
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exception_callback.assert_has_calls(
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[
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call(987, 654, extra=321),
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call(987, 654, extra=321),
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call(987, 654, extra=321),
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call(987, 654, extra=321),
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call(987, 654, extra=321),
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call(987, 654, extra=321),
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]
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)
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self.assertEqual(exception_callback.call_count, 6) # no additional calls
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