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284 lines
8.7 KiB
Python
284 lines
8.7 KiB
Python
from django.db import connection, transaction
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from django.test import TransactionTestCase, skipUnlessDBFeature
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from .models import Thing
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class ForcedError(Exception):
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pass
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@skipUnlessDBFeature("supports_transactions")
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class TestConnectionOnCommit(TransactionTestCase):
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"""
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Tests for transaction.on_commit().
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Creation/checking of database objects in parallel with callback tracking is
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to verify that the behavior of the two match in all tested cases.
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"""
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available_apps = ["transaction_hooks"]
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def setUp(self):
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self.notified = []
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def notify(self, id_):
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if id_ == "error":
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raise ForcedError()
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self.notified.append(id_)
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def do(self, num):
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"""Create a Thing instance and notify about it."""
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Thing.objects.create(num=num)
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transaction.on_commit(lambda: self.notify(num))
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def assertDone(self, nums):
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self.assertNotified(nums)
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self.assertEqual(sorted(t.num for t in Thing.objects.all()), sorted(nums))
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def assertNotified(self, nums):
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self.assertEqual(self.notified, nums)
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def test_executes_immediately_if_no_transaction(self):
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self.do(1)
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self.assertDone([1])
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def test_robust_if_no_transaction(self):
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def robust_callback():
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raise ForcedError("robust callback")
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with self.assertLogs("django.db.backends.base", "ERROR") as cm:
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transaction.on_commit(robust_callback, robust=True)
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self.do(1)
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self.assertDone([1])
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log_record = cm.records[0]
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self.assertEqual(
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log_record.getMessage(),
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"Error calling TestConnectionOnCommit.test_robust_if_no_transaction."
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"<locals>.robust_callback in on_commit() (robust callback).",
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)
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self.assertIsNotNone(log_record.exc_info)
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raised_exception = log_record.exc_info[1]
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self.assertIsInstance(raised_exception, ForcedError)
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self.assertEqual(str(raised_exception), "robust callback")
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def test_robust_transaction(self):
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def robust_callback():
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raise ForcedError("robust callback")
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with self.assertLogs("django.db.backends", "ERROR") as cm:
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with transaction.atomic():
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transaction.on_commit(robust_callback, robust=True)
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self.do(1)
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self.assertDone([1])
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log_record = cm.records[0]
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self.assertEqual(
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log_record.getMessage(),
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"Error calling TestConnectionOnCommit.test_robust_transaction.<locals>."
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"robust_callback in on_commit() during transaction (robust callback).",
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)
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self.assertIsNotNone(log_record.exc_info)
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raised_exception = log_record.exc_info[1]
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self.assertIsInstance(raised_exception, ForcedError)
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self.assertEqual(str(raised_exception), "robust callback")
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def test_delays_execution_until_after_transaction_commit(self):
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with transaction.atomic():
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self.do(1)
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self.assertNotified([])
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self.assertDone([1])
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def test_does_not_execute_if_transaction_rolled_back(self):
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try:
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with transaction.atomic():
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self.do(1)
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raise ForcedError()
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except ForcedError:
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pass
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self.assertDone([])
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def test_executes_only_after_final_transaction_committed(self):
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with transaction.atomic():
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with transaction.atomic():
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self.do(1)
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self.assertNotified([])
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self.assertNotified([])
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self.assertDone([1])
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def test_discards_hooks_from_rolled_back_savepoint(self):
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with transaction.atomic():
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# one successful savepoint
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with transaction.atomic():
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self.do(1)
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# one failed savepoint
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try:
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with transaction.atomic():
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self.do(2)
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raise ForcedError()
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except ForcedError:
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pass
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# another successful savepoint
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with transaction.atomic():
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self.do(3)
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# only hooks registered during successful savepoints execute
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self.assertDone([1, 3])
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def test_no_hooks_run_from_failed_transaction(self):
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"""If outer transaction fails, no hooks from within it run."""
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try:
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with transaction.atomic():
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with transaction.atomic():
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self.do(1)
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raise ForcedError()
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except ForcedError:
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pass
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self.assertDone([])
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def test_inner_savepoint_rolled_back_with_outer(self):
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with transaction.atomic():
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try:
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with transaction.atomic():
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with transaction.atomic():
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self.do(1)
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raise ForcedError()
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except ForcedError:
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pass
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self.do(2)
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self.assertDone([2])
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def test_no_savepoints_atomic_merged_with_outer(self):
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with transaction.atomic():
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with transaction.atomic():
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self.do(1)
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try:
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with transaction.atomic(savepoint=False):
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raise ForcedError()
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except ForcedError:
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pass
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self.assertDone([])
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def test_inner_savepoint_does_not_affect_outer(self):
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with transaction.atomic():
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with transaction.atomic():
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self.do(1)
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try:
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with transaction.atomic():
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raise ForcedError()
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except ForcedError:
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pass
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self.assertDone([1])
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def test_runs_hooks_in_order_registered(self):
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with transaction.atomic():
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self.do(1)
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with transaction.atomic():
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self.do(2)
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self.do(3)
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self.assertDone([1, 2, 3])
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def test_hooks_cleared_after_successful_commit(self):
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with transaction.atomic():
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self.do(1)
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with transaction.atomic():
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self.do(2)
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self.assertDone([1, 2]) # not [1, 1, 2]
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def test_hooks_cleared_after_rollback(self):
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try:
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with transaction.atomic():
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self.do(1)
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raise ForcedError()
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except ForcedError:
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pass
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with transaction.atomic():
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self.do(2)
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self.assertDone([2])
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@skipUnlessDBFeature("test_db_allows_multiple_connections")
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def test_hooks_cleared_on_reconnect(self):
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with transaction.atomic():
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self.do(1)
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connection.close()
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connection.connect()
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with transaction.atomic():
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self.do(2)
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self.assertDone([2])
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def test_error_in_hook_doesnt_prevent_clearing_hooks(self):
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try:
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with transaction.atomic():
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transaction.on_commit(lambda: self.notify("error"))
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except ForcedError:
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pass
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with transaction.atomic():
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self.do(1)
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self.assertDone([1])
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def test_db_query_in_hook(self):
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with transaction.atomic():
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Thing.objects.create(num=1)
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transaction.on_commit(
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lambda: [self.notify(t.num) for t in Thing.objects.all()]
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)
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self.assertDone([1])
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def test_transaction_in_hook(self):
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def on_commit():
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with transaction.atomic():
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t = Thing.objects.create(num=1)
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self.notify(t.num)
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with transaction.atomic():
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transaction.on_commit(on_commit)
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self.assertDone([1])
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def test_hook_in_hook(self):
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def on_commit(i, add_hook):
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with transaction.atomic():
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if add_hook:
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transaction.on_commit(lambda: on_commit(i + 10, False))
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t = Thing.objects.create(num=i)
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self.notify(t.num)
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with transaction.atomic():
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transaction.on_commit(lambda: on_commit(1, True))
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transaction.on_commit(lambda: on_commit(2, True))
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self.assertDone([1, 11, 2, 12])
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def test_raises_exception_non_autocommit_mode(self):
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def should_never_be_called():
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raise AssertionError("this function should never be called")
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try:
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connection.set_autocommit(False)
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msg = "on_commit() cannot be used in manual transaction management"
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with self.assertRaisesMessage(transaction.TransactionManagementError, msg):
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transaction.on_commit(should_never_be_called)
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finally:
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connection.set_autocommit(True)
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def test_raises_exception_non_callable(self):
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msg = "on_commit()'s callback must be a callable."
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with self.assertRaisesMessage(TypeError, msg):
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transaction.on_commit(None)
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