260 lines
8.1 KiB
Python
260 lines
8.1 KiB
Python
import sys
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import imp
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import os
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import unittest
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from test import test_support
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test_src = """\
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def get_name():
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return __name__
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def get_file():
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return __file__
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"""
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absimp = "import sub\n"
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relimp = "from . import sub\n"
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deeprelimp = "from .... import sub\n"
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futimp = "from __future__ import absolute_import\n"
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reload_src = test_src+"""\
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reloaded = True
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"""
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test_co = compile(test_src, "<???>", "exec")
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reload_co = compile(reload_src, "<???>", "exec")
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test2_oldabs_co = compile(absimp + test_src, "<???>", "exec")
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test2_newabs_co = compile(futimp + absimp + test_src, "<???>", "exec")
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test2_newrel_co = compile(relimp + test_src, "<???>", "exec")
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test2_deeprel_co = compile(deeprelimp + test_src, "<???>", "exec")
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test2_futrel_co = compile(futimp + relimp + test_src, "<???>", "exec")
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test_path = "!!!_test_!!!"
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class TestImporter:
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modules = {
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"hooktestmodule": (False, test_co),
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"hooktestpackage": (True, test_co),
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"hooktestpackage.sub": (True, test_co),
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"hooktestpackage.sub.subber": (True, test_co),
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"hooktestpackage.oldabs": (False, test2_oldabs_co),
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"hooktestpackage.newabs": (False, test2_newabs_co),
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"hooktestpackage.newrel": (False, test2_newrel_co),
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"hooktestpackage.sub.subber.subest": (True, test2_deeprel_co),
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"hooktestpackage.futrel": (False, test2_futrel_co),
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"sub": (False, test_co),
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"reloadmodule": (False, test_co),
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}
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def __init__(self, path=test_path):
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if path != test_path:
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# if out class is on sys.path_hooks, we must raise
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# ImportError for any path item that we can't handle.
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raise ImportError
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self.path = path
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def _get__path__(self):
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raise NotImplementedError
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def find_module(self, fullname, path=None):
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if fullname in self.modules:
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return self
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else:
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return None
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def load_module(self, fullname):
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ispkg, code = self.modules[fullname]
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mod = sys.modules.setdefault(fullname,imp.new_module(fullname))
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mod.__file__ = "<%s>" % self.__class__.__name__
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mod.__loader__ = self
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if ispkg:
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mod.__path__ = self._get__path__()
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exec code in mod.__dict__
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return mod
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class MetaImporter(TestImporter):
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def _get__path__(self):
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return []
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class PathImporter(TestImporter):
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def _get__path__(self):
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return [self.path]
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class ImportBlocker:
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"""Place an ImportBlocker instance on sys.meta_path and you
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can be sure the modules you specified can't be imported, even
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if it's a builtin."""
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def __init__(self, *namestoblock):
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self.namestoblock = dict.fromkeys(namestoblock)
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def find_module(self, fullname, path=None):
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if fullname in self.namestoblock:
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return self
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return None
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def load_module(self, fullname):
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raise ImportError, "I dare you"
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class ImpWrapper:
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def __init__(self, path=None):
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if path is not None and not os.path.isdir(path):
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raise ImportError
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self.path = path
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def find_module(self, fullname, path=None):
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subname = fullname.split(".")[-1]
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if subname != fullname and self.path is None:
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return None
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if self.path is None:
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path = None
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else:
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path = [self.path]
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try:
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file, filename, stuff = imp.find_module(subname, path)
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except ImportError:
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return None
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return ImpLoader(file, filename, stuff)
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class ImpLoader:
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def __init__(self, file, filename, stuff):
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self.file = file
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self.filename = filename
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self.stuff = stuff
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def load_module(self, fullname):
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mod = imp.load_module(fullname, self.file, self.filename, self.stuff)
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if self.file:
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self.file.close()
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mod.__loader__ = self # for introspection
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return mod
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class ImportHooksBaseTestCase(unittest.TestCase):
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def setUp(self):
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self.path = sys.path[:]
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self.meta_path = sys.meta_path[:]
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self.path_hooks = sys.path_hooks[:]
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sys.path_importer_cache.clear()
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self.modules_before = sys.modules.copy()
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def tearDown(self):
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sys.path[:] = self.path
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sys.meta_path[:] = self.meta_path
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sys.path_hooks[:] = self.path_hooks
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sys.path_importer_cache.clear()
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sys.modules.clear()
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sys.modules.update(self.modules_before)
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class ImportHooksTestCase(ImportHooksBaseTestCase):
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def doTestImports(self, importer=None):
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import hooktestmodule
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import hooktestpackage
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import hooktestpackage.sub
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import hooktestpackage.sub.subber
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self.assertEqual(hooktestmodule.get_name(),
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"hooktestmodule")
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self.assertEqual(hooktestpackage.get_name(),
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"hooktestpackage")
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self.assertEqual(hooktestpackage.sub.get_name(),
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"hooktestpackage.sub")
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self.assertEqual(hooktestpackage.sub.subber.get_name(),
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"hooktestpackage.sub.subber")
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if importer:
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self.assertEqual(hooktestmodule.__loader__, importer)
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self.assertEqual(hooktestpackage.__loader__, importer)
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self.assertEqual(hooktestpackage.sub.__loader__, importer)
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self.assertEqual(hooktestpackage.sub.subber.__loader__, importer)
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TestImporter.modules['reloadmodule'] = (False, test_co)
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import reloadmodule
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self.assertFalse(hasattr(reloadmodule,'reloaded'))
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TestImporter.modules['reloadmodule'] = (False, reload_co)
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reload(reloadmodule)
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self.assertTrue(hasattr(reloadmodule,'reloaded'))
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import hooktestpackage.oldabs
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self.assertEqual(hooktestpackage.oldabs.get_name(),
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"hooktestpackage.oldabs")
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self.assertEqual(hooktestpackage.oldabs.sub,
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hooktestpackage.sub)
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import hooktestpackage.newrel
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self.assertEqual(hooktestpackage.newrel.get_name(),
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"hooktestpackage.newrel")
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self.assertEqual(hooktestpackage.newrel.sub,
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hooktestpackage.sub)
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import hooktestpackage.sub.subber.subest as subest
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self.assertEqual(subest.get_name(),
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"hooktestpackage.sub.subber.subest")
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self.assertEqual(subest.sub,
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hooktestpackage.sub)
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import hooktestpackage.futrel
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self.assertEqual(hooktestpackage.futrel.get_name(),
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"hooktestpackage.futrel")
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self.assertEqual(hooktestpackage.futrel.sub,
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hooktestpackage.sub)
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import sub
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self.assertEqual(sub.get_name(), "sub")
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import hooktestpackage.newabs
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self.assertEqual(hooktestpackage.newabs.get_name(),
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"hooktestpackage.newabs")
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self.assertEqual(hooktestpackage.newabs.sub, sub)
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def testMetaPath(self):
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i = MetaImporter()
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sys.meta_path.append(i)
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self.doTestImports(i)
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def testPathHook(self):
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sys.path_hooks.append(PathImporter)
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sys.path.append(test_path)
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self.doTestImports()
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def testBlocker(self):
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mname = "exceptions" # an arbitrary harmless builtin module
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if mname in sys.modules:
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del sys.modules[mname]
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sys.meta_path.append(ImportBlocker(mname))
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try:
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__import__(mname)
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except ImportError:
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pass
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else:
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self.fail("'%s' was not supposed to be importable" % mname)
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def testImpWrapper(self):
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i = ImpWrapper()
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sys.meta_path.append(i)
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sys.path_hooks.append(ImpWrapper)
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mnames = ("colorsys", "urlparse", "distutils.core", "compiler.misc")
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for mname in mnames:
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parent = mname.split(".")[0]
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for n in sys.modules.keys():
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if n.startswith(parent):
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del sys.modules[n]
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for mname in mnames:
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m = __import__(mname, globals(), locals(), ["__dummy__"])
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m.__loader__ # to make sure we actually handled the import
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def test_main():
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test_support.run_unittest(ImportHooksTestCase)
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if __name__ == "__main__":
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test_main()
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