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# Copyright (c) 2001-2004 Twisted Matrix Laboratories.
# See LICENSE for details.


# System Imports
import sys

from twisted.trial import unittest

try:
    import cPickle as pickle
except ImportError:
    import pickle

try:
    import cStringIO as StringIO
except ImportError:
    import StringIO

# Twisted Imports
from twisted.persisted import styles, aot, crefutil


class VersionTestCase(unittest.TestCase):
    def testNullVersionUpgrade(self):
        global NullVersioned
        class NullVersioned:
            ok = 0
        pkcl = pickle.dumps(NullVersioned())
        class NullVersioned(styles.Versioned):
            persistenceVersion = 1
            def upgradeToVersion1(self):
                self.ok = 1
        mnv = pickle.loads(pkcl)
        styles.doUpgrade()
        assert mnv.ok, "initial upgrade not run!"

    def testVersionUpgrade(self):
        global MyVersioned
        class MyVersioned(styles.Versioned):
            persistenceVersion = 2
            persistenceForgets = ['garbagedata']
            v3 = 0
            v4 = 0

            def __init__(self):
                self.somedata = 'xxx'
                self.garbagedata = lambda q: 'cant persist'

            def upgradeToVersion3(self):
                self.v3 += 1

            def upgradeToVersion4(self):
                self.v4 += 1
        mv = MyVersioned()
        assert not (mv.v3 or mv.v4), "hasn't been upgraded yet"
        pickl = pickle.dumps(mv)
        MyVersioned.persistenceVersion = 4
        obj = pickle.loads(pickl)
        styles.doUpgrade()
        assert obj.v3, "didn't do version 3 upgrade"
        assert obj.v4, "didn't do version 4 upgrade"
        pickl = pickle.dumps(obj)
        obj = pickle.loads(pickl)
        styles.doUpgrade()
        assert obj.v3 == 1, "upgraded unnecessarily"
        assert obj.v4 == 1, "upgraded unnecessarily"
    
    def testNonIdentityHash(self):
        global ClassWithCustomHash
        class ClassWithCustomHash(styles.Versioned):
            def __init__(self, unique, hash):
                self.unique = unique
                self.hash = hash
            def __hash__(self):
                return self.hash
        
        v1 = ClassWithCustomHash('v1', 0)
        v2 = ClassWithCustomHash('v2', 0)

        pkl = pickle.dumps((v1, v2))
        del v1, v2
        ClassWithCustomHash.persistenceVersion = 1
        ClassWithCustomHash.upgradeToVersion1 = lambda self: setattr(self, 'upgraded', True)
        v1, v2 = pickle.loads(pkl)
        styles.doUpgrade()
        self.assertEquals(v1.unique, 'v1')
        self.assertEquals(v2.unique, 'v2')
        self.failUnless(v1.upgraded)
        self.failUnless(v2.upgraded)
    
    def testUpgradeDeserializesObjectsRequiringUpgrade(self):
        global ToyClassA, ToyClassB
        class ToyClassA(styles.Versioned):
            pass
        class ToyClassB(styles.Versioned):
            pass
        x = ToyClassA()
        y = ToyClassB()
        pklA, pklB = pickle.dumps(x), pickle.dumps(y)
        del x, y
        ToyClassA.persistenceVersion = 1
        def upgradeToVersion1(self):
            self.y = pickle.loads(pklB)
            styles.doUpgrade()
        ToyClassA.upgradeToVersion1 = upgradeToVersion1
        ToyClassB.persistenceVersion = 1
        ToyClassB.upgradeToVersion1 = lambda self: setattr(self, 'upgraded', True)

        x = pickle.loads(pklA)
        styles.doUpgrade()
        self.failUnless(x.y.upgraded)

class MyEphemeral(styles.Ephemeral):

    def __init__(self, x):
        self.x = x


class EphemeralTestCase(unittest.TestCase):

    def testEphemeral(self):
        o = MyEphemeral(3)
        self.assertEquals(o.__class__, MyEphemeral)
        self.assertEquals(o.x, 3)
        
        pickl = pickle.dumps(o)
        o = pickle.loads(pickl)
        
        self.assertEquals(o.__class__, styles.Ephemeral)
        self.assert_(not hasattr(o, 'x'))


class Pickleable:

    def __init__(self, x):
        self.x = x
    
    def getX(self):
        return self.x

class A:
    """
    dummy class
    """
    def amethod(self):
        pass

class B:
    """
    dummy class
    """
    def bmethod(self):
        pass

def funktion():
    pass

class PicklingTestCase(unittest.TestCase):
    """Test pickling of extra object types."""
    
    def testModule(self):
        pickl = pickle.dumps(styles)
        o = pickle.loads(pickl)
        self.assertEquals(o, styles)
    
    def testClassMethod(self):
        pickl = pickle.dumps(Pickleable.getX)
        o = pickle.loads(pickl)
        self.assertEquals(o, Pickleable.getX)
    
    def testInstanceMethod(self):
        obj = Pickleable(4)
        pickl = pickle.dumps(obj.getX)
        o = pickle.loads(pickl)
        self.assertEquals(o(), 4)
        self.assertEquals(type(o), type(obj.getX))
    
    def testStringIO(self):
        f = StringIO.StringIO()
        f.write("abc")
        pickl = pickle.dumps(f)
        o = pickle.loads(pickl)
        self.assertEquals(type(o), type(f))
        self.assertEquals(f.getvalue(), "abc")


class EvilSourceror:
    def __init__(self, x):
        self.a = self
        self.a.b = self
        self.a.b.c = x

class NonDictState:
    def __getstate__(self):
        return self.state
    def __setstate__(self, state):
        self.state = state

class AOTTestCase(unittest.TestCase):
    def testSimpleTypes(self):
        obj = (1, 2.0, 3j, True, slice(1, 2, 3), 'hello', u'world', sys.maxint + 1, None, Ellipsis)
        rtObj = aot.unjellyFromSource(aot.jellyToSource(obj))
        self.assertEquals(obj, rtObj)

    def testMethodSelfIdentity(self):
        a = A()
        b = B()
        a.bmethod = b.bmethod
        b.a = a
        im_ = aot.unjellyFromSource(aot.jellyToSource(b)).a.bmethod
        self.assertEquals(im_.im_class, im_.im_self.__class__)


    def test_methodNotSelfIdentity(self):
        """
        If a class change after an instance has been created,
        L{aot.unjellyFromSource} shoud raise a C{TypeError} when trying to
        unjelly the instance.
        """
        a = A()
        b = B()
        a.bmethod = b.bmethod
        b.a = a
        savedbmethod = B.bmethod
        del B.bmethod
        try:
            self.assertRaises(TypeError, aot.unjellyFromSource,
                              aot.jellyToSource(b))
        finally:
            B.bmethod = savedbmethod


    def test_unsupportedType(self):
        """
        L{aot.jellyToSource} should raise a C{TypeError} when trying to jelly
        an unknown type.
        """
        try:
            set
        except:
            from sets import Set as set
        self.assertRaises(TypeError, aot.jellyToSource, set())


    def testBasicIdentity(self):
        # Anyone wanting to make this datastructure more complex, and thus this
        # test more comprehensive, is welcome to do so.
        aj = aot.AOTJellier().jellyToAO
        d = {'hello': 'world', "method": aj}
        l = [1, 2, 3,
             "he\tllo\n\n\"x world!",
             u"goodbye \n\t\u1010 world!",
             1, 1.0, 100 ** 100l, unittest, aot.AOTJellier, d,
             funktion
             ]
        t = tuple(l)
        l.append(l)
        l.append(t)
        l.append(t)
        uj = aot.unjellyFromSource(aot.jellyToSource([l, l]))
        assert uj[0] is uj[1]
        assert uj[1][0:5] == l[0:5]


    def testNonDictState(self):
        a = NonDictState()
        a.state = "meringue!"
        assert aot.unjellyFromSource(aot.jellyToSource(a)).state == a.state

    def testCopyReg(self):
        s = "foo_bar"
        sio = StringIO.StringIO()
        sio.write(s)
        uj = aot.unjellyFromSource(aot.jellyToSource(sio))
        # print repr(uj.__dict__)
        assert uj.getvalue() == s

    def testFunkyReferences(self):
        o = EvilSourceror(EvilSourceror([]))
        j1 = aot.jellyToAOT(o)
        oj = aot.unjellyFromAOT(j1)

        assert oj.a is oj
        assert oj.a.b is oj.b
        assert oj.c is not oj.c.c


class CrefUtilTestCase(unittest.TestCase):
    """
    Tests for L{crefutil}.
    """

    def test_dictUnknownKey(self):
        """
        L{crefutil._DictKeyAndValue} only support keys C{0} and C{1}.
        """
        d = crefutil._DictKeyAndValue({})
        self.assertRaises(RuntimeError, d.__setitem__, 2, 3)


    def test_deferSetMultipleTimes(self):
        """
        L{crefutil._Defer} can be assigned a key only one time.
        """
        d = crefutil._Defer()
        d[0] = 1
        self.assertRaises(RuntimeError, d.__setitem__, 0, 1)



testCases = [VersionTestCase, EphemeralTestCase, PicklingTestCase]


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