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from sqlalchemy.testing import fixtures
from sqlalchemy.testing.util import gc_collect
from sqlalchemy.testing import assert_raises_message, is_, eq_
from sqlalchemy import exc, MetaData
from sqlalchemy.ext.declarative import clsregistry
import weakref
class MockClass(object):
def __init__(self, base, name):
self._decl_class_registry = base
tokens = name.split(".")
self.__module__ = ".".join(tokens[0:-1])
self.name = self.__name__ = tokens[-1]
self.metadata = MetaData()
class MockProp(object):
parent = "some_parent"
class ClsRegistryTest(fixtures.TestBase):
__requires__ = 'predictable_gc',
def test_same_module_same_name(self):
base = weakref.WeakValueDictionary()
f1 = MockClass(base, "foo.bar.Foo")
f2 = MockClass(base, "foo.bar.Foo")
clsregistry.add_class("Foo", f1)
gc_collect()
assert_raises_message(
exc.SAWarning,
"This declarative base already contains a class with the "
"same class name and module name as foo.bar.Foo, and "
"will be replaced in the string-lookup table.",
clsregistry.add_class, "Foo", f2
)
def test_resolve(self):
base = weakref.WeakValueDictionary()
f1 = MockClass(base, "foo.bar.Foo")
f2 = MockClass(base, "foo.alt.Foo")
clsregistry.add_class("Foo", f1)
clsregistry.add_class("Foo", f2)
resolver = clsregistry._resolver(f1, MockProp())
gc_collect()
is_(resolver("foo.bar.Foo")(), f1)
is_(resolver("foo.alt.Foo")(), f2)
def test_fragment_resolve(self):
base = weakref.WeakValueDictionary()
f1 = MockClass(base, "foo.bar.Foo")
f2 = MockClass(base, "foo.alt.Foo")
f3 = MockClass(base, "bat.alt.Hoho")
clsregistry.add_class("Foo", f1)
clsregistry.add_class("Foo", f2)
clsregistry.add_class("HoHo", f3)
resolver = clsregistry._resolver(f1, MockProp())
gc_collect()
is_(resolver("bar.Foo")(), f1)
is_(resolver("alt.Foo")(), f2)
def test_fragment_ambiguous(self):
base = weakref.WeakValueDictionary()
f1 = MockClass(base, "foo.bar.Foo")
f2 = MockClass(base, "foo.alt.Foo")
f3 = MockClass(base, "bat.alt.Foo")
clsregistry.add_class("Foo", f1)
clsregistry.add_class("Foo", f2)
clsregistry.add_class("Foo", f3)
resolver = clsregistry._resolver(f1, MockProp())
gc_collect()
assert_raises_message(
exc.InvalidRequestError,
'Multiple classes found for path "alt.Foo" in the registry '
'of this declarative base. Please use a fully '
'module-qualified path.',
resolver("alt.Foo")
)
def test_resolve_dupe_by_name(self):
base = weakref.WeakValueDictionary()
f1 = MockClass(base, "foo.bar.Foo")
f2 = MockClass(base, "foo.alt.Foo")
clsregistry.add_class("Foo", f1)
clsregistry.add_class("Foo", f2)
gc_collect()
resolver = clsregistry._resolver(f1, MockProp())
resolver = resolver("Foo")
assert_raises_message(
exc.InvalidRequestError,
'Multiple classes found for path "Foo" in the '
'registry of this declarative base. Please use a '
'fully module-qualified path.',
resolver
)
def test_dupe_classes_back_to_one(self):
base = weakref.WeakValueDictionary()
f1 = MockClass(base, "foo.bar.Foo")
f2 = MockClass(base, "foo.alt.Foo")
clsregistry.add_class("Foo", f1)
clsregistry.add_class("Foo", f2)
del f2
gc_collect()
# registry restores itself to just the one class
resolver = clsregistry._resolver(f1, MockProp())
resolver = resolver("Foo")
is_(resolver(), f1)
def test_dupe_classes_cleanout(self):
# force this to maintain isolation between tests
clsregistry._registries.clear()
base = weakref.WeakValueDictionary()
for i in range(3):
f1 = MockClass(base, "foo.bar.Foo")
f2 = MockClass(base, "foo.alt.Foo")
clsregistry.add_class("Foo", f1)
clsregistry.add_class("Foo", f2)
eq_(len(clsregistry._registries), 11)
del f1
del f2
gc_collect()
eq_(len(clsregistry._registries), 1)
def test_dupe_classes_name_race(self):
"""test the race condition that the class was garbage "
"collected while being resolved from a dupe class."""
base = weakref.WeakValueDictionary()
f1 = MockClass(base, "foo.bar.Foo")
f2 = MockClass(base, "foo.alt.Foo")
clsregistry.add_class("Foo", f1)
clsregistry.add_class("Foo", f2)
dupe_reg = base['Foo']
dupe_reg.contents = [lambda: None]
resolver = clsregistry._resolver(f1, MockProp())
resolver = resolver("Foo")
assert_raises_message(
exc.InvalidRequestError,
"When initializing mapper some_parent, expression "
"'Foo' failed to locate a name \('Foo'\).",
resolver
)
def test_module_reg_cleanout_race(self):
"""test the race condition that a class was gc'ed as we tried
to look it up by module name."""
base = weakref.WeakValueDictionary()
f1 = MockClass(base, "foo.bar.Foo")
clsregistry.add_class("Foo", f1)
reg = base['_sa_module_registry']
mod_entry = reg['foo']['bar']
resolver = clsregistry._resolver(f1, MockProp())
resolver = resolver("foo")
del mod_entry.contents["Foo"]
assert_raises_message(
AttributeError,
"Module 'bar' has no mapped classes registered "
"under the name 'Foo'",
lambda: resolver().bar.Foo
)
def test_module_reg_no_class(self):
base = weakref.WeakValueDictionary()
f1 = MockClass(base, "foo.bar.Foo")
clsregistry.add_class("Foo", f1)
reg = base['_sa_module_registry']
mod_entry = reg['foo']['bar'] # noqa
resolver = clsregistry._resolver(f1, MockProp())
resolver = resolver("foo")
assert_raises_message(
AttributeError,
"Module 'bar' has no mapped classes registered "
"under the name 'Bat'",
lambda: resolver().bar.Bat
)
def test_module_reg_cleanout_two_sub(self):
base = weakref.WeakValueDictionary()
f1 = MockClass(base, "foo.bar.Foo")
clsregistry.add_class("Foo", f1)
reg = base['_sa_module_registry']
f2 = MockClass(base, "foo.alt.Bar")
clsregistry.add_class("Bar", f2)
assert reg['foo']['bar']
del f1
gc_collect()
assert 'bar' not in \
reg['foo']
assert 'alt' in reg['foo']
del f2
gc_collect()
assert 'foo' not in reg.contents
def test_module_reg_cleanout_sub_to_base(self):
base = weakref.WeakValueDictionary()
f3 = MockClass(base, "bat.bar.Hoho")
clsregistry.add_class("Hoho", f3)
reg = base['_sa_module_registry']
assert reg['bat']['bar']
del f3
gc_collect()
assert 'bat' not in reg
def test_module_reg_cleanout_cls_to_base(self):
base = weakref.WeakValueDictionary()
f4 = MockClass(base, "single.Blat")
clsregistry.add_class("Blat", f4)
reg = base['_sa_module_registry']
assert reg['single']
del f4
gc_collect()
assert 'single' not in reg
|
