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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
import sys, os
import types
from twisted.trial import unittest
from twisted.python import rebuild
import crash_test_dummy
f = crash_test_dummy.foo
class Foo: pass
class Bar(Foo): pass
class Baz(object): pass
class Buz(Bar, Baz): pass
class HashRaisesRuntimeError:
"""
Things that don't hash (raise an Exception) should be ignored by the
rebuilder.
@ivar hashCalled: C{bool} set to True when __hash__ is called.
"""
def __init__(self):
self.hashCalled = False
def __hash__(self):
self.hashCalled = True
raise RuntimeError('not a TypeError!')
unhashableObject = None # set in test_hashException
class RebuildTestCase(unittest.TestCase):
"""
Simple testcase for rebuilding, to at least exercise the code.
"""
def setUp(self):
self.libPath = self.mktemp()
os.mkdir(self.libPath)
self.fakelibPath = os.path.join(self.libPath, 'twisted_rebuild_fakelib')
os.mkdir(self.fakelibPath)
file(os.path.join(self.fakelibPath, '__init__.py'), 'w').close()
sys.path.insert(0, self.libPath)
def tearDown(self):
sys.path.remove(self.libPath)
def testFileRebuild(self):
from twisted.python.util import sibpath
import shutil, time
shutil.copyfile(sibpath(__file__, "myrebuilder1.py"),
os.path.join(self.fakelibPath, "myrebuilder.py"))
from twisted_rebuild_fakelib import myrebuilder
a = myrebuilder.A()
try:
object
except NameError:
pass
else:
from twisted.test import test_rebuild
b = myrebuilder.B()
class C(myrebuilder.B):
pass
test_rebuild.C = C
c = C()
i = myrebuilder.Inherit()
self.assertEqual(a.a(), 'a')
# necessary because the file has not "changed" if a second has not gone
# by in unix. This sucks, but it's not often that you'll be doing more
# than one reload per second.
time.sleep(1.1)
shutil.copyfile(sibpath(__file__, "myrebuilder2.py"),
os.path.join(self.fakelibPath, "myrebuilder.py"))
rebuild.rebuild(myrebuilder)
try:
object
except NameError:
pass
else:
b2 = myrebuilder.B()
self.assertEqual(b2.b(), 'c')
self.assertEqual(b.b(), 'c')
self.assertEqual(i.a(), 'd')
self.assertEqual(a.a(), 'b')
# more work to be done on new-style classes
# self.assertEqual(c.b(), 'c')
def testRebuild(self):
"""
Rebuilding an unchanged module.
"""
# This test would actually pass if rebuild was a no-op, but it
# ensures rebuild doesn't break stuff while being a less
# complex test than testFileRebuild.
x = crash_test_dummy.X('a')
rebuild.rebuild(crash_test_dummy, doLog=False)
# Instance rebuilding is triggered by attribute access.
x.do()
self.failUnlessIdentical(x.__class__, crash_test_dummy.X)
self.failUnlessIdentical(f, crash_test_dummy.foo)
def testComponentInteraction(self):
x = crash_test_dummy.XComponent()
x.setAdapter(crash_test_dummy.IX, crash_test_dummy.XA)
oldComponent = x.getComponent(crash_test_dummy.IX)
rebuild.rebuild(crash_test_dummy, 0)
newComponent = x.getComponent(crash_test_dummy.IX)
newComponent.method()
self.assertEqual(newComponent.__class__, crash_test_dummy.XA)
# Test that a duplicate registerAdapter is not allowed
from twisted.python import components
self.failUnlessRaises(ValueError, components.registerAdapter,
crash_test_dummy.XA, crash_test_dummy.X,
crash_test_dummy.IX)
def testUpdateInstance(self):
global Foo, Buz
b = Buz()
class Foo:
def foo(self):
pass
class Buz(Bar, Baz):
x = 10
rebuild.updateInstance(b)
assert hasattr(b, 'foo'), "Missing method on rebuilt instance"
assert hasattr(b, 'x'), "Missing class attribute on rebuilt instance"
def testBananaInteraction(self):
from twisted.python import rebuild
from twisted.spread import banana
rebuild.latestClass(banana.Banana)
def test_hashException(self):
"""
Rebuilding something that has a __hash__ that raises a non-TypeError
shouldn't cause rebuild to die.
"""
global unhashableObject
unhashableObject = HashRaisesRuntimeError()
def _cleanup():
global unhashableObject
unhashableObject = None
self.addCleanup(_cleanup)
rebuild.rebuild(rebuild)
self.assertEqual(unhashableObject.hashCalled, True)
class NewStyleTestCase(unittest.TestCase):
"""
Tests for rebuilding new-style classes of various sorts.
"""
def setUp(self):
self.m = types.ModuleType('whipping')
sys.modules['whipping'] = self.m
def tearDown(self):
del sys.modules['whipping']
del self.m
def test_slots(self):
"""
Try to rebuild a new style class with slots defined.
"""
classDefinition = (
"class SlottedClass(object):\n"
" __slots__ = ['a']\n")
exec classDefinition in self.m.__dict__
inst = self.m.SlottedClass()
inst.a = 7
exec classDefinition in self.m.__dict__
rebuild.updateInstance(inst)
self.assertEqual(inst.a, 7)
self.assertIdentical(type(inst), self.m.SlottedClass)
if sys.version_info < (2, 6):
test_slots.skip = "__class__ assignment for class with slots is only available starting Python 2.6"
def test_errorSlots(self):
"""
Try to rebuild a new style class with slots defined: this should fail.
"""
classDefinition = (
"class SlottedClass(object):\n"
" __slots__ = ['a']\n")
exec classDefinition in self.m.__dict__
inst = self.m.SlottedClass()
inst.a = 7
exec classDefinition in self.m.__dict__
self.assertRaises(rebuild.RebuildError, rebuild.updateInstance, inst)
if sys.version_info >= (2, 6):
test_errorSlots.skip = "__class__ assignment for class with slots should work starting Python 2.6"
def test_typeSubclass(self):
"""
Try to rebuild a base type subclass.
"""
classDefinition = (
"class ListSubclass(list):\n"
" pass\n")
exec classDefinition in self.m.__dict__
inst = self.m.ListSubclass()
inst.append(2)
exec classDefinition in self.m.__dict__
rebuild.updateInstance(inst)
self.assertEqual(inst[0], 2)
self.assertIdentical(type(inst), self.m.ListSubclass)
def test_instanceSlots(self):
"""
Test that when rebuilding an instance with a __slots__ attribute, it
fails accurately instead of giving a L{rebuild.RebuildError}.
"""
classDefinition = (
"class NotSlottedClass(object):\n"
" pass\n")
exec classDefinition in self.m.__dict__
inst = self.m.NotSlottedClass()
inst.__slots__ = ['a']
classDefinition = (
"class NotSlottedClass:\n"
" pass\n")
exec classDefinition in self.m.__dict__
# Moving from new-style class to old-style should fail.
self.assertRaises(TypeError, rebuild.updateInstance, inst)
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