mirror of https://github.com/django/django.git
580 lines
25 KiB
Python
580 lines
25 KiB
Python
import sys
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import threading
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import time
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from unittest import skipIf, skipUnless
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from django.db import (
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DatabaseError,
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Error,
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IntegrityError,
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OperationalError,
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connection,
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transaction,
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)
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from django.test import (
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TestCase,
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TransactionTestCase,
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skipIfDBFeature,
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skipUnlessDBFeature,
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)
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from .models import Reporter
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@skipUnlessDBFeature("uses_savepoints")
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class AtomicTests(TransactionTestCase):
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"""
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Tests for the atomic decorator and context manager.
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The tests make assertions on internal attributes because there isn't a
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robust way to ask the database for its current transaction state.
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Since the decorator syntax is converted into a context manager (see the
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implementation), there are only a few basic tests with the decorator
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syntax and the bulk of the tests use the context manager syntax.
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"""
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available_apps = ["transactions"]
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def test_decorator_syntax_commit(self):
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@transaction.atomic
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def make_reporter():
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return Reporter.objects.create(first_name="Tintin")
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reporter = make_reporter()
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self.assertSequenceEqual(Reporter.objects.all(), [reporter])
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def test_decorator_syntax_rollback(self):
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@transaction.atomic
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def make_reporter():
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Reporter.objects.create(first_name="Haddock")
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raise Exception("Oops, that's his last name")
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with self.assertRaisesMessage(Exception, "Oops"):
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make_reporter()
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self.assertSequenceEqual(Reporter.objects.all(), [])
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def test_alternate_decorator_syntax_commit(self):
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@transaction.atomic()
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def make_reporter():
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return Reporter.objects.create(first_name="Tintin")
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reporter = make_reporter()
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self.assertSequenceEqual(Reporter.objects.all(), [reporter])
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def test_alternate_decorator_syntax_rollback(self):
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@transaction.atomic()
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def make_reporter():
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Reporter.objects.create(first_name="Haddock")
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raise Exception("Oops, that's his last name")
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with self.assertRaisesMessage(Exception, "Oops"):
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make_reporter()
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self.assertSequenceEqual(Reporter.objects.all(), [])
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def test_commit(self):
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with transaction.atomic():
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reporter = Reporter.objects.create(first_name="Tintin")
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self.assertSequenceEqual(Reporter.objects.all(), [reporter])
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def test_rollback(self):
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with self.assertRaisesMessage(Exception, "Oops"):
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with transaction.atomic():
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Reporter.objects.create(first_name="Haddock")
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raise Exception("Oops, that's his last name")
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self.assertSequenceEqual(Reporter.objects.all(), [])
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def test_nested_commit_commit(self):
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with transaction.atomic():
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reporter1 = Reporter.objects.create(first_name="Tintin")
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with transaction.atomic():
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reporter2 = Reporter.objects.create(
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first_name="Archibald", last_name="Haddock"
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)
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self.assertSequenceEqual(Reporter.objects.all(), [reporter2, reporter1])
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def test_nested_commit_rollback(self):
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with transaction.atomic():
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reporter = Reporter.objects.create(first_name="Tintin")
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with self.assertRaisesMessage(Exception, "Oops"):
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with transaction.atomic():
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Reporter.objects.create(first_name="Haddock")
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raise Exception("Oops, that's his last name")
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self.assertSequenceEqual(Reporter.objects.all(), [reporter])
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def test_nested_rollback_commit(self):
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with self.assertRaisesMessage(Exception, "Oops"):
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with transaction.atomic():
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Reporter.objects.create(last_name="Tintin")
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with transaction.atomic():
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Reporter.objects.create(last_name="Haddock")
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raise Exception("Oops, that's his first name")
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self.assertSequenceEqual(Reporter.objects.all(), [])
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def test_nested_rollback_rollback(self):
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with self.assertRaisesMessage(Exception, "Oops"):
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with transaction.atomic():
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Reporter.objects.create(last_name="Tintin")
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with self.assertRaisesMessage(Exception, "Oops"):
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with transaction.atomic():
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Reporter.objects.create(first_name="Haddock")
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raise Exception("Oops, that's his last name")
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raise Exception("Oops, that's his first name")
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self.assertSequenceEqual(Reporter.objects.all(), [])
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def test_merged_commit_commit(self):
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with transaction.atomic():
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reporter1 = Reporter.objects.create(first_name="Tintin")
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with transaction.atomic(savepoint=False):
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reporter2 = Reporter.objects.create(
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first_name="Archibald", last_name="Haddock"
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)
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self.assertSequenceEqual(Reporter.objects.all(), [reporter2, reporter1])
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def test_merged_commit_rollback(self):
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with transaction.atomic():
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Reporter.objects.create(first_name="Tintin")
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with self.assertRaisesMessage(Exception, "Oops"):
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with transaction.atomic(savepoint=False):
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Reporter.objects.create(first_name="Haddock")
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raise Exception("Oops, that's his last name")
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# Writes in the outer block are rolled back too.
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self.assertSequenceEqual(Reporter.objects.all(), [])
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def test_merged_rollback_commit(self):
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with self.assertRaisesMessage(Exception, "Oops"):
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with transaction.atomic():
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Reporter.objects.create(last_name="Tintin")
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with transaction.atomic(savepoint=False):
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Reporter.objects.create(last_name="Haddock")
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raise Exception("Oops, that's his first name")
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self.assertSequenceEqual(Reporter.objects.all(), [])
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def test_merged_rollback_rollback(self):
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with self.assertRaisesMessage(Exception, "Oops"):
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with transaction.atomic():
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Reporter.objects.create(last_name="Tintin")
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with self.assertRaisesMessage(Exception, "Oops"):
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with transaction.atomic(savepoint=False):
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Reporter.objects.create(first_name="Haddock")
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raise Exception("Oops, that's his last name")
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raise Exception("Oops, that's his first name")
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self.assertSequenceEqual(Reporter.objects.all(), [])
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def test_reuse_commit_commit(self):
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atomic = transaction.atomic()
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with atomic:
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reporter1 = Reporter.objects.create(first_name="Tintin")
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with atomic:
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reporter2 = Reporter.objects.create(
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first_name="Archibald", last_name="Haddock"
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)
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self.assertSequenceEqual(Reporter.objects.all(), [reporter2, reporter1])
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def test_reuse_commit_rollback(self):
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atomic = transaction.atomic()
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with atomic:
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reporter = Reporter.objects.create(first_name="Tintin")
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with self.assertRaisesMessage(Exception, "Oops"):
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with atomic:
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Reporter.objects.create(first_name="Haddock")
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raise Exception("Oops, that's his last name")
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self.assertSequenceEqual(Reporter.objects.all(), [reporter])
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def test_reuse_rollback_commit(self):
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atomic = transaction.atomic()
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with self.assertRaisesMessage(Exception, "Oops"):
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with atomic:
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Reporter.objects.create(last_name="Tintin")
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with atomic:
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Reporter.objects.create(last_name="Haddock")
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raise Exception("Oops, that's his first name")
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self.assertSequenceEqual(Reporter.objects.all(), [])
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def test_reuse_rollback_rollback(self):
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atomic = transaction.atomic()
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with self.assertRaisesMessage(Exception, "Oops"):
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with atomic:
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Reporter.objects.create(last_name="Tintin")
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with self.assertRaisesMessage(Exception, "Oops"):
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with atomic:
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Reporter.objects.create(first_name="Haddock")
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raise Exception("Oops, that's his last name")
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raise Exception("Oops, that's his first name")
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self.assertSequenceEqual(Reporter.objects.all(), [])
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def test_force_rollback(self):
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with transaction.atomic():
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Reporter.objects.create(first_name="Tintin")
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# atomic block shouldn't rollback, but force it.
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self.assertFalse(transaction.get_rollback())
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transaction.set_rollback(True)
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self.assertSequenceEqual(Reporter.objects.all(), [])
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def test_prevent_rollback(self):
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with transaction.atomic():
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reporter = Reporter.objects.create(first_name="Tintin")
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sid = transaction.savepoint()
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# trigger a database error inside an inner atomic without savepoint
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with self.assertRaises(DatabaseError):
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with transaction.atomic(savepoint=False):
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with connection.cursor() as cursor:
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cursor.execute("SELECT no_such_col FROM transactions_reporter")
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# prevent atomic from rolling back since we're recovering manually
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self.assertTrue(transaction.get_rollback())
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transaction.set_rollback(False)
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transaction.savepoint_rollback(sid)
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self.assertSequenceEqual(Reporter.objects.all(), [reporter])
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@skipUnlessDBFeature("can_release_savepoints")
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def test_failure_on_exit_transaction(self):
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with transaction.atomic():
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with self.assertRaises(DatabaseError):
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with transaction.atomic():
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Reporter.objects.create(last_name="Tintin")
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self.assertEqual(len(Reporter.objects.all()), 1)
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# Incorrect savepoint id to provoke a database error.
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connection.savepoint_ids.append("12")
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with self.assertRaises(transaction.TransactionManagementError):
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len(Reporter.objects.all())
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self.assertIs(connection.needs_rollback, True)
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if connection.savepoint_ids:
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connection.savepoint_ids.pop()
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self.assertSequenceEqual(Reporter.objects.all(), [])
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class AtomicInsideTransactionTests(AtomicTests):
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"""All basic tests for atomic should also pass within an existing transaction."""
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def setUp(self):
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self.atomic = transaction.atomic()
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self.atomic.__enter__()
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def tearDown(self):
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self.atomic.__exit__(*sys.exc_info())
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class AtomicWithoutAutocommitTests(AtomicTests):
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"""All basic tests for atomic should also pass when autocommit is turned off."""
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def setUp(self):
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transaction.set_autocommit(False)
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self.addCleanup(transaction.set_autocommit, True)
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# The tests access the database after exercising 'atomic', initiating
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# a transaction ; a rollback is required before restoring autocommit.
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self.addCleanup(transaction.rollback)
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@skipUnlessDBFeature("uses_savepoints")
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class AtomicMergeTests(TransactionTestCase):
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"""Test merging transactions with savepoint=False."""
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available_apps = ["transactions"]
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def test_merged_outer_rollback(self):
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with transaction.atomic():
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Reporter.objects.create(first_name="Tintin")
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with transaction.atomic(savepoint=False):
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Reporter.objects.create(first_name="Archibald", last_name="Haddock")
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with self.assertRaisesMessage(Exception, "Oops"):
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with transaction.atomic(savepoint=False):
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Reporter.objects.create(first_name="Calculus")
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raise Exception("Oops, that's his last name")
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# The third insert couldn't be roll back. Temporarily mark the
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# connection as not needing rollback to check it.
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self.assertTrue(transaction.get_rollback())
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transaction.set_rollback(False)
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self.assertEqual(Reporter.objects.count(), 3)
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transaction.set_rollback(True)
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# The second insert couldn't be roll back. Temporarily mark the
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# connection as not needing rollback to check it.
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self.assertTrue(transaction.get_rollback())
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transaction.set_rollback(False)
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self.assertEqual(Reporter.objects.count(), 3)
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transaction.set_rollback(True)
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# The first block has a savepoint and must roll back.
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self.assertSequenceEqual(Reporter.objects.all(), [])
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def test_merged_inner_savepoint_rollback(self):
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with transaction.atomic():
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reporter = Reporter.objects.create(first_name="Tintin")
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with transaction.atomic():
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Reporter.objects.create(first_name="Archibald", last_name="Haddock")
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with self.assertRaisesMessage(Exception, "Oops"):
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with transaction.atomic(savepoint=False):
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Reporter.objects.create(first_name="Calculus")
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raise Exception("Oops, that's his last name")
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# The third insert couldn't be roll back. Temporarily mark the
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# connection as not needing rollback to check it.
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self.assertTrue(transaction.get_rollback())
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transaction.set_rollback(False)
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self.assertEqual(Reporter.objects.count(), 3)
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transaction.set_rollback(True)
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# The second block has a savepoint and must roll back.
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self.assertEqual(Reporter.objects.count(), 1)
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self.assertSequenceEqual(Reporter.objects.all(), [reporter])
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@skipUnlessDBFeature("uses_savepoints")
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class AtomicErrorsTests(TransactionTestCase):
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available_apps = ["transactions"]
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forbidden_atomic_msg = "This is forbidden when an 'atomic' block is active."
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def test_atomic_prevents_setting_autocommit(self):
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autocommit = transaction.get_autocommit()
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with transaction.atomic():
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with self.assertRaisesMessage(
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transaction.TransactionManagementError, self.forbidden_atomic_msg
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):
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transaction.set_autocommit(not autocommit)
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# Make sure autocommit wasn't changed.
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self.assertEqual(connection.autocommit, autocommit)
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def test_atomic_prevents_calling_transaction_methods(self):
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with transaction.atomic():
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with self.assertRaisesMessage(
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transaction.TransactionManagementError, self.forbidden_atomic_msg
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):
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transaction.commit()
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with self.assertRaisesMessage(
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transaction.TransactionManagementError, self.forbidden_atomic_msg
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):
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transaction.rollback()
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def test_atomic_prevents_queries_in_broken_transaction(self):
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r1 = Reporter.objects.create(first_name="Archibald", last_name="Haddock")
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with transaction.atomic():
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r2 = Reporter(first_name="Cuthbert", last_name="Calculus", id=r1.id)
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with self.assertRaises(IntegrityError):
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r2.save(force_insert=True)
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# The transaction is marked as needing rollback.
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msg = (
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"An error occurred in the current transaction. You can't "
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"execute queries until the end of the 'atomic' block."
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)
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with self.assertRaisesMessage(
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transaction.TransactionManagementError, msg
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) as cm:
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r2.save(force_update=True)
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self.assertIsInstance(cm.exception.__cause__, IntegrityError)
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self.assertEqual(Reporter.objects.get(pk=r1.pk).last_name, "Haddock")
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@skipIfDBFeature("atomic_transactions")
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def test_atomic_allows_queries_after_fixing_transaction(self):
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r1 = Reporter.objects.create(first_name="Archibald", last_name="Haddock")
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with transaction.atomic():
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r2 = Reporter(first_name="Cuthbert", last_name="Calculus", id=r1.id)
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with self.assertRaises(IntegrityError):
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r2.save(force_insert=True)
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# Mark the transaction as no longer needing rollback.
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transaction.set_rollback(False)
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r2.save(force_update=True)
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self.assertEqual(Reporter.objects.get(pk=r1.pk).last_name, "Calculus")
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@skipUnlessDBFeature("test_db_allows_multiple_connections")
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def test_atomic_prevents_queries_in_broken_transaction_after_client_close(self):
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with transaction.atomic():
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Reporter.objects.create(first_name="Archibald", last_name="Haddock")
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connection.close()
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# The connection is closed and the transaction is marked as
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# needing rollback. This will raise an InterfaceError on databases
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# that refuse to create cursors on closed connections (PostgreSQL)
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# and a TransactionManagementError on other databases.
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with self.assertRaises(Error):
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Reporter.objects.create(first_name="Cuthbert", last_name="Calculus")
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# The connection is usable again .
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self.assertEqual(Reporter.objects.count(), 0)
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@skipUnlessDBFeature("uses_savepoints")
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@skipUnless(connection.vendor == "mysql", "MySQL-specific behaviors")
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class AtomicMySQLTests(TransactionTestCase):
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available_apps = ["transactions"]
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@skipIf(threading is None, "Test requires threading")
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def test_implicit_savepoint_rollback(self):
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"""MySQL implicitly rolls back savepoints when it deadlocks (#22291)."""
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Reporter.objects.create(id=1)
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Reporter.objects.create(id=2)
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main_thread_ready = threading.Event()
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def other_thread():
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try:
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with transaction.atomic():
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Reporter.objects.select_for_update().get(id=1)
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main_thread_ready.wait()
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# 1) This line locks... (see below for 2)
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Reporter.objects.exclude(id=1).update(id=2)
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finally:
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# This is the thread-local connection, not the main connection.
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connection.close()
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other_thread = threading.Thread(target=other_thread)
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other_thread.start()
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with self.assertRaisesMessage(OperationalError, "Deadlock found"):
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# Double atomic to enter a transaction and create a savepoint.
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with transaction.atomic():
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with transaction.atomic():
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Reporter.objects.select_for_update().get(id=2)
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main_thread_ready.set()
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# The two threads can't be synchronized with an event here
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# because the other thread locks. Sleep for a little while.
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time.sleep(1)
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# 2) ... and this line deadlocks. (see above for 1)
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Reporter.objects.exclude(id=2).update(id=1)
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other_thread.join()
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class AtomicMiscTests(TransactionTestCase):
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available_apps = ["transactions"]
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def test_wrap_callable_instance(self):
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"""#20028 -- Atomic must support wrapping callable instances."""
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class Callable:
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def __call__(self):
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pass
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# Must not raise an exception
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transaction.atomic(Callable())
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@skipUnlessDBFeature("can_release_savepoints")
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def test_atomic_does_not_leak_savepoints_on_failure(self):
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"""#23074 -- Savepoints must be released after rollback."""
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# Expect an error when rolling back a savepoint that doesn't exist.
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# Done outside of the transaction block to ensure proper recovery.
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with self.assertRaises(Error):
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# Start a plain transaction.
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with transaction.atomic():
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# Swallow the intentional error raised in the sub-transaction.
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with self.assertRaisesMessage(Exception, "Oops"):
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# Start a sub-transaction with a savepoint.
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with transaction.atomic():
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sid = connection.savepoint_ids[-1]
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raise Exception("Oops")
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# This is expected to fail because the savepoint no longer exists.
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connection.savepoint_rollback(sid)
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def test_mark_for_rollback_on_error_in_transaction(self):
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with transaction.atomic(savepoint=False):
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# Swallow the intentional error raised.
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with self.assertRaisesMessage(Exception, "Oops"):
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# Wrap in `mark_for_rollback_on_error` to check if the
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# transaction is marked broken.
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with transaction.mark_for_rollback_on_error():
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# Ensure that we are still in a good state.
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self.assertFalse(transaction.get_rollback())
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raise Exception("Oops")
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# mark_for_rollback_on_error marked the transaction as broken …
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self.assertTrue(transaction.get_rollback())
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|
|
# … and further queries fail.
|
|
msg = "You can't execute queries until the end of the 'atomic' block."
|
|
with self.assertRaisesMessage(transaction.TransactionManagementError, msg):
|
|
Reporter.objects.create()
|
|
|
|
# Transaction errors are reset at the end of an transaction, so this
|
|
# should just work.
|
|
Reporter.objects.create()
|
|
|
|
def test_mark_for_rollback_on_error_in_autocommit(self):
|
|
self.assertTrue(transaction.get_autocommit())
|
|
|
|
# Swallow the intentional error raised.
|
|
with self.assertRaisesMessage(Exception, "Oops"):
|
|
# Wrap in `mark_for_rollback_on_error` to check if the transaction
|
|
# is marked broken.
|
|
with transaction.mark_for_rollback_on_error():
|
|
# Ensure that we are still in a good state.
|
|
self.assertFalse(transaction.get_connection().needs_rollback)
|
|
|
|
raise Exception("Oops")
|
|
|
|
# Ensure that `mark_for_rollback_on_error` did not mark the transaction
|
|
# as broken, since we are in autocommit mode …
|
|
self.assertFalse(transaction.get_connection().needs_rollback)
|
|
|
|
# … and further queries work nicely.
|
|
Reporter.objects.create()
|
|
|
|
|
|
class NonAutocommitTests(TransactionTestCase):
|
|
available_apps = []
|
|
|
|
def setUp(self):
|
|
transaction.set_autocommit(False)
|
|
self.addCleanup(transaction.set_autocommit, True)
|
|
self.addCleanup(transaction.rollback)
|
|
|
|
def test_orm_query_after_error_and_rollback(self):
|
|
"""
|
|
ORM queries are allowed after an error and a rollback in non-autocommit
|
|
mode (#27504).
|
|
"""
|
|
r1 = Reporter.objects.create(first_name="Archibald", last_name="Haddock")
|
|
r2 = Reporter(first_name="Cuthbert", last_name="Calculus", id=r1.id)
|
|
with self.assertRaises(IntegrityError):
|
|
r2.save(force_insert=True)
|
|
transaction.rollback()
|
|
Reporter.objects.last()
|
|
|
|
def test_orm_query_without_autocommit(self):
|
|
"""#24921 -- ORM queries must be possible after set_autocommit(False)."""
|
|
Reporter.objects.create(first_name="Tintin")
|
|
|
|
|
|
class DurableTestsBase:
|
|
available_apps = ["transactions"]
|
|
|
|
def test_commit(self):
|
|
with transaction.atomic(durable=True):
|
|
reporter = Reporter.objects.create(first_name="Tintin")
|
|
self.assertEqual(Reporter.objects.get(), reporter)
|
|
|
|
def test_nested_outer_durable(self):
|
|
with transaction.atomic(durable=True):
|
|
reporter1 = Reporter.objects.create(first_name="Tintin")
|
|
with transaction.atomic():
|
|
reporter2 = Reporter.objects.create(
|
|
first_name="Archibald",
|
|
last_name="Haddock",
|
|
)
|
|
self.assertSequenceEqual(Reporter.objects.all(), [reporter2, reporter1])
|
|
|
|
def test_nested_both_durable(self):
|
|
msg = "A durable atomic block cannot be nested within another atomic block."
|
|
with transaction.atomic(durable=True):
|
|
with self.assertRaisesMessage(RuntimeError, msg):
|
|
with transaction.atomic(durable=True):
|
|
pass
|
|
|
|
def test_nested_inner_durable(self):
|
|
msg = "A durable atomic block cannot be nested within another atomic block."
|
|
with transaction.atomic():
|
|
with self.assertRaisesMessage(RuntimeError, msg):
|
|
with transaction.atomic(durable=True):
|
|
pass
|
|
|
|
def test_sequence_of_durables(self):
|
|
with transaction.atomic(durable=True):
|
|
reporter = Reporter.objects.create(first_name="Tintin 1")
|
|
self.assertEqual(Reporter.objects.get(first_name="Tintin 1"), reporter)
|
|
with transaction.atomic(durable=True):
|
|
reporter = Reporter.objects.create(first_name="Tintin 2")
|
|
self.assertEqual(Reporter.objects.get(first_name="Tintin 2"), reporter)
|
|
|
|
|
|
class DurableTransactionTests(DurableTestsBase, TransactionTestCase):
|
|
pass
|
|
|
|
|
|
class DurableTests(DurableTestsBase, TestCase):
|
|
pass
|