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6d14fdc271
#14910 fixed the regression introduced by #13873 where sqlite database migrations would no longer run inside a transaction. However, it committed the transaction before Synapse updated its bookkeeping of which migrations have been run, which means that migrations may be run again after they have completed successfully. Leave the transaction open at the end of `executescript`, to restore the old, correct behaviour. Also make the PostgreSQL behaviour consistent with SQLite. Fixes #14909. Signed-off-by: Sean Quah <seanq@matrix.org>
280 lines
10 KiB
Python
280 lines
10 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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LoggingDatabaseConnection,
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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 ExecuteScriptTestCase(unittest.HomeserverTestCase):
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"""Tests for `BaseDatabaseEngine.executescript` implementations."""
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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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self.get_success(
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self.db_pool.runInteraction(
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"create",
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lambda txn: txn.execute("CREATE TABLE foo (name TEXT PRIMARY KEY)"),
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)
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)
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def test_transaction(self) -> None:
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"""Test that all statements are run in a single transaction."""
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def run(conn: LoggingDatabaseConnection) -> None:
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cur = conn.cursor(txn_name="test_transaction")
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self.db_pool.engine.executescript(
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cur,
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";".join(
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[
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"INSERT INTO foo (name) VALUES ('transaction test')",
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# This next statement will fail. When `executescript` is not
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# transactional, the previous row will be observed later.
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"INSERT INTO foo (name) VALUES ('transaction test')",
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]
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),
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)
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self.get_failure(
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self.db_pool.runWithConnection(run),
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self.db_pool.engine.module.IntegrityError,
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)
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self.assertIsNone(
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self.get_success(
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self.db_pool.simple_select_one_onecol(
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"foo",
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keyvalues={"name": "transaction test"},
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retcol="name",
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allow_none=True,
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)
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),
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"executescript is not running statements inside a transaction",
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)
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def test_commit(self) -> None:
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"""Test that the script transaction remains open and can be committed."""
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def run(conn: LoggingDatabaseConnection) -> None:
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cur = conn.cursor(txn_name="test_commit")
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self.db_pool.engine.executescript(
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cur, "INSERT INTO foo (name) VALUES ('commit test')"
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)
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cur.execute("COMMIT")
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self.get_success(self.db_pool.runWithConnection(run))
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self.assertIsNotNone(
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self.get_success(
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self.db_pool.simple_select_one_onecol(
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"foo",
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keyvalues={"name": "commit test"},
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retcol="name",
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allow_none=True,
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)
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),
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)
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def test_rollback(self) -> None:
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"""Test that the script transaction remains open and can be rolled back."""
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def run(conn: LoggingDatabaseConnection) -> None:
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cur = conn.cursor(txn_name="test_rollback")
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self.db_pool.engine.executescript(
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cur, "INSERT INTO foo (name) VALUES ('rollback test')"
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)
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cur.execute("ROLLBACK")
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self.get_success(self.db_pool.runWithConnection(run))
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self.assertIsNone(
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self.get_success(
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self.db_pool.simple_select_one_onecol(
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"foo",
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keyvalues={"name": "rollback test"},
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retcol="name",
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allow_none=True,
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)
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),
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"executescript is not leaving the script transaction open",
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)
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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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