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