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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
from __future__ import division, absolute_import
import os
import sys
from textwrap import dedent
from twisted.trial import unittest
from twisted.persisted import sob
from twisted.python import components
from twisted.persisted.styles import Ephemeral
class Dummy(components.Componentized):
pass
objects = [
1,
"hello",
(1, "hello"),
[1, "hello"],
{1:"hello"},
]
class FakeModule(object):
pass
class PersistTests(unittest.TestCase):
def testStyles(self):
for o in objects:
p = sob.Persistent(o, '')
for style in 'source pickle'.split():
p.setStyle(style)
p.save(filename='persisttest.'+style)
o1 = sob.load('persisttest.'+style, style)
self.assertEqual(o, o1)
def testStylesBeingSet(self):
o = Dummy()
o.foo = 5
o.setComponent(sob.IPersistable, sob.Persistent(o, 'lala'))
for style in 'source pickle'.split():
sob.IPersistable(o).setStyle(style)
sob.IPersistable(o).save(filename='lala.'+style)
o1 = sob.load('lala.'+style, style)
self.assertEqual(o.foo, o1.foo)
self.assertEqual(sob.IPersistable(o1).style, style)
def testPassphraseError(self):
"""
Calling save() with a passphrase is an error.
"""
p = sob.Persistant(None, 'object')
self.assertRaises(
TypeError, p.save, 'filename.pickle', passphrase='abc')
def testNames(self):
o = [1,2,3]
p = sob.Persistent(o, 'object')
for style in 'source pickle'.split():
p.setStyle(style)
p.save()
o1 = sob.load('object.ta'+style[0], style)
self.assertEqual(o, o1)
for tag in 'lala lolo'.split():
p.save(tag)
o1 = sob.load('object-'+tag+'.ta'+style[0], style)
self.assertEqual(o, o1)
def testPython(self):
with open("persisttest.python", 'w') as f:
f.write('foo=[1,2,3] ')
o = sob.loadValueFromFile('persisttest.python', 'foo')
self.assertEqual(o, [1,2,3])
def testTypeGuesser(self):
self.assertRaises(KeyError, sob.guessType, "file.blah")
self.assertEqual('python', sob.guessType("file.py"))
self.assertEqual('python', sob.guessType("file.tac"))
self.assertEqual('python', sob.guessType("file.etac"))
self.assertEqual('pickle', sob.guessType("file.tap"))
self.assertEqual('pickle', sob.guessType("file.etap"))
self.assertEqual('source', sob.guessType("file.tas"))
self.assertEqual('source', sob.guessType("file.etas"))
def testEverythingEphemeralGetattr(self):
"""
L{_EverythingEphermal.__getattr__} will proxy the __main__ module as an
L{Ephemeral} object, and during load will be transparent, but after
load will return L{Ephemeral} objects from any accessed attributes.
"""
self.fakeMain.testMainModGetattr = 1
dirname = self.mktemp()
os.mkdir(dirname)
filename = os.path.join(dirname, 'persisttest.ee_getattr')
global mainWhileLoading
mainWhileLoading = None
with open(filename, "w") as f:
f.write(dedent("""
app = []
import __main__
app.append(__main__.testMainModGetattr == 1)
try:
__main__.somethingElse
except AttributeError:
app.append(True)
else:
app.append(False)
from twisted.test import test_sob
test_sob.mainWhileLoading = __main__
"""))
loaded = sob.load(filename, 'source')
self.assertIsInstance(loaded, list)
self.assertTrue(loaded[0], "Expected attribute not set.")
self.assertTrue(loaded[1], "Unexpected attribute set.")
self.assertIsInstance(mainWhileLoading, Ephemeral)
self.assertIsInstance(mainWhileLoading.somethingElse, Ephemeral)
del mainWhileLoading
def testEverythingEphemeralSetattr(self):
"""
Verify that _EverythingEphemeral.__setattr__ won't affect __main__.
"""
self.fakeMain.testMainModSetattr = 1
dirname = self.mktemp()
os.mkdir(dirname)
filename = os.path.join(dirname, 'persisttest.ee_setattr')
with open(filename, 'w') as f:
f.write('import __main__\n')
f.write('__main__.testMainModSetattr = 2\n')
f.write('app = None\n')
sob.load(filename, 'source')
self.assertEqual(self.fakeMain.testMainModSetattr, 1)
def testEverythingEphemeralException(self):
"""
Test that an exception during load() won't cause _EE to mask __main__
"""
dirname = self.mktemp()
os.mkdir(dirname)
filename = os.path.join(dirname, 'persisttest.ee_exception')
with open(filename, 'w') as f:
f.write('raise ValueError\n')
self.assertRaises(ValueError, sob.load, filename, 'source')
self.assertEqual(type(sys.modules['__main__']), FakeModule)
def setUp(self):
"""
Replace the __main__ module with a fake one, so that it can be mutated
in tests
"""
self.realMain = sys.modules['__main__']
self.fakeMain = sys.modules['__main__'] = FakeModule()
def tearDown(self):
"""
Restore __main__ to its original value
"""
sys.modules['__main__'] = self.realMain