1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
|
import sys
import imp
import os
import unittest
from test import test_support
test_src = """\
def get_name():
return __name__
def get_file():
return __file__
"""
absimp = "import sub\n"
relimp = "from . import sub\n"
deeprelimp = "from .... import sub\n"
futimp = "from __future__ import absolute_import\n"
reload_src = test_src+"""\
reloaded = True
"""
test_co = compile(test_src, "<???>", "exec")
reload_co = compile(reload_src, "<???>", "exec")
test2_oldabs_co = compile(absimp + test_src, "<???>", "exec")
test2_newabs_co = compile(futimp + absimp + test_src, "<???>", "exec")
test2_newrel_co = compile(relimp + test_src, "<???>", "exec")
test2_deeprel_co = compile(deeprelimp + test_src, "<???>", "exec")
test2_futrel_co = compile(futimp + relimp + test_src, "<???>", "exec")
test_path = "!!!_test_!!!"
class TestImporter:
modules = {
"hooktestmodule": (False, test_co),
"hooktestpackage": (True, test_co),
"hooktestpackage.sub": (True, test_co),
"hooktestpackage.sub.subber": (True, test_co),
"hooktestpackage.oldabs": (False, test2_oldabs_co),
"hooktestpackage.newabs": (False, test2_newabs_co),
"hooktestpackage.newrel": (False, test2_newrel_co),
"hooktestpackage.sub.subber.subest": (True, test2_deeprel_co),
"hooktestpackage.futrel": (False, test2_futrel_co),
"sub": (False, test_co),
"reloadmodule": (False, test_co),
}
def __init__(self, path=test_path):
if path != test_path:
# if out class is on sys.path_hooks, we must raise
# ImportError for any path item that we can't handle.
raise ImportError
self.path = path
def _get__path__(self):
raise NotImplementedError
def find_module(self, fullname, path=None):
if fullname in self.modules:
return self
else:
return None
def load_module(self, fullname):
ispkg, code = self.modules[fullname]
mod = sys.modules.setdefault(fullname,imp.new_module(fullname))
mod.__file__ = "<%s>" % self.__class__.__name__
mod.__loader__ = self
if ispkg:
mod.__path__ = self._get__path__()
exec code in mod.__dict__
return mod
class MetaImporter(TestImporter):
def _get__path__(self):
return []
class PathImporter(TestImporter):
def _get__path__(self):
return [self.path]
class ImportBlocker:
"""Place an ImportBlocker instance on sys.meta_path and you
can be sure the modules you specified can't be imported, even
if it's a builtin."""
def __init__(self, *namestoblock):
self.namestoblock = dict.fromkeys(namestoblock)
def find_module(self, fullname, path=None):
if fullname in self.namestoblock:
return self
return None
def load_module(self, fullname):
raise ImportError, "I dare you"
class ImpWrapper:
def __init__(self, path=None):
if path is not None and not os.path.isdir(path):
raise ImportError
self.path = path
def find_module(self, fullname, path=None):
subname = fullname.split(".")[-1]
if subname != fullname and self.path is None:
return None
if self.path is None:
path = None
else:
path = [self.path]
try:
file, filename, stuff = imp.find_module(subname, path)
except ImportError:
return None
return ImpLoader(file, filename, stuff)
class ImpLoader:
def __init__(self, file, filename, stuff):
self.file = file
self.filename = filename
self.stuff = stuff
def load_module(self, fullname):
mod = imp.load_module(fullname, self.file, self.filename, self.stuff)
if self.file:
self.file.close()
mod.__loader__ = self # for introspection
return mod
class ImportHooksBaseTestCase(unittest.TestCase):
def setUp(self):
self.path = sys.path[:]
self.meta_path = sys.meta_path[:]
self.path_hooks = sys.path_hooks[:]
sys.path_importer_cache.clear()
self.modules_before = sys.modules.copy()
def tearDown(self):
sys.path[:] = self.path
sys.meta_path[:] = self.meta_path
sys.path_hooks[:] = self.path_hooks
sys.path_importer_cache.clear()
sys.modules.clear()
sys.modules.update(self.modules_before)
class ImportHooksTestCase(ImportHooksBaseTestCase):
def doTestImports(self, importer=None):
import hooktestmodule
import hooktestpackage
import hooktestpackage.sub
import hooktestpackage.sub.subber
self.assertEqual(hooktestmodule.get_name(),
"hooktestmodule")
self.assertEqual(hooktestpackage.get_name(),
"hooktestpackage")
self.assertEqual(hooktestpackage.sub.get_name(),
"hooktestpackage.sub")
self.assertEqual(hooktestpackage.sub.subber.get_name(),
"hooktestpackage.sub.subber")
if importer:
self.assertEqual(hooktestmodule.__loader__, importer)
self.assertEqual(hooktestpackage.__loader__, importer)
self.assertEqual(hooktestpackage.sub.__loader__, importer)
self.assertEqual(hooktestpackage.sub.subber.__loader__, importer)
TestImporter.modules['reloadmodule'] = (False, test_co)
import reloadmodule
self.assertFalse(hasattr(reloadmodule,'reloaded'))
TestImporter.modules['reloadmodule'] = (False, reload_co)
imp.reload(reloadmodule)
self.assertTrue(hasattr(reloadmodule,'reloaded'))
import hooktestpackage.oldabs
self.assertEqual(hooktestpackage.oldabs.get_name(),
"hooktestpackage.oldabs")
self.assertEqual(hooktestpackage.oldabs.sub,
hooktestpackage.sub)
import hooktestpackage.newrel
self.assertEqual(hooktestpackage.newrel.get_name(),
"hooktestpackage.newrel")
self.assertEqual(hooktestpackage.newrel.sub,
hooktestpackage.sub)
import hooktestpackage.sub.subber.subest as subest
self.assertEqual(subest.get_name(),
"hooktestpackage.sub.subber.subest")
self.assertEqual(subest.sub,
hooktestpackage.sub)
import hooktestpackage.futrel
self.assertEqual(hooktestpackage.futrel.get_name(),
"hooktestpackage.futrel")
self.assertEqual(hooktestpackage.futrel.sub,
hooktestpackage.sub)
import sub
self.assertEqual(sub.get_name(), "sub")
import hooktestpackage.newabs
self.assertEqual(hooktestpackage.newabs.get_name(),
"hooktestpackage.newabs")
self.assertEqual(hooktestpackage.newabs.sub, sub)
def testMetaPath(self):
i = MetaImporter()
sys.meta_path.append(i)
self.doTestImports(i)
def testPathHook(self):
sys.path_hooks.append(PathImporter)
sys.path.append(test_path)
self.doTestImports()
def testBlocker(self):
mname = "exceptions" # an arbitrary harmless builtin module
test_support.unload(mname)
sys.meta_path.append(ImportBlocker(mname))
self.assertRaises(ImportError, __import__, mname)
def testImpWrapper(self):
i = ImpWrapper()
sys.meta_path.append(i)
sys.path_hooks.append(ImpWrapper)
mnames = ("colorsys", "urlparse", "distutils.core", "compiler.misc")
for mname in mnames:
parent = mname.split(".")[0]
for n in sys.modules.keys():
if n.startswith(parent):
del sys.modules[n]
with test_support.check_warnings(("The compiler package is deprecated "
"and removed", DeprecationWarning)):
for mname in mnames:
m = __import__(mname, globals(), locals(), ["__dummy__"])
m.__loader__ # to make sure we actually handled the import
def test_main():
test_support.run_unittest(ImportHooksTestCase)
if __name__ == "__main__":
test_main()
|
