from importlib import machinery import importlib import importlib.abc from .. import abc from .. import util from . import util as source_util import errno import imp import marshal import os import py_compile import shutil import stat import sys import unittest from test.support import make_legacy_pyc class SimpleTest(unittest.TestCase): """Should have no issue importing a source module [basic]. And if there is a syntax error, it should raise a SyntaxError [syntax error]. """ def test_load_module_API(self): # If fullname is not specified that assume self.name is desired. class TesterMixin(importlib.abc.Loader): def load_module(self, fullname): return fullname def module_repr(self, module): return '' class Tester(importlib.abc.FileLoader, TesterMixin): def get_code(self, _): pass def get_source(self, _): pass def is_package(self, _): pass name = 'mod_name' loader = Tester(name, 'some_path') self.assertEqual(name, loader.load_module()) self.assertEqual(name, loader.load_module(None)) self.assertEqual(name, loader.load_module(name)) with self.assertRaises(ImportError): loader.load_module(loader.name + 'XXX') def test_get_filename_API(self): # If fullname is not set then assume self.path is desired. class Tester(importlib.abc.FileLoader): def get_code(self, _): pass def get_source(self, _): pass def is_package(self, _): pass def module_repr(self, _): pass path = 'some_path' name = 'some_name' loader = Tester(name, path) self.assertEqual(path, loader.get_filename(name)) self.assertEqual(path, loader.get_filename()) self.assertEqual(path, loader.get_filename(None)) with self.assertRaises(ImportError): loader.get_filename(name + 'XXX') # [basic] def test_module(self): with source_util.create_modules('_temp') as mapping: loader = machinery.SourceFileLoader('_temp', mapping['_temp']) module = loader.load_module('_temp') self.assertIn('_temp', sys.modules) check = {'__name__': '_temp', '__file__': mapping['_temp'], '__package__': ''} for attr, value in check.items(): self.assertEqual(getattr(module, attr), value) def test_package(self): with source_util.create_modules('_pkg.__init__') as mapping: loader = machinery.SourceFileLoader('_pkg', mapping['_pkg.__init__']) module = loader.load_module('_pkg') self.assertIn('_pkg', sys.modules) check = {'__name__': '_pkg', '__file__': mapping['_pkg.__init__'], '__path__': [os.path.dirname(mapping['_pkg.__init__'])], '__package__': '_pkg'} for attr, value in check.items(): self.assertEqual(getattr(module, attr), value) def test_lacking_parent(self): with source_util.create_modules('_pkg.__init__', '_pkg.mod')as mapping: loader = machinery.SourceFileLoader('_pkg.mod', mapping['_pkg.mod']) module = loader.load_module('_pkg.mod') self.assertIn('_pkg.mod', sys.modules) check = {'__name__': '_pkg.mod', '__file__': mapping['_pkg.mod'], '__package__': '_pkg'} for attr, value in check.items(): self.assertEqual(getattr(module, attr), value) def fake_mtime(self, fxn): """Fake mtime to always be higher than expected.""" return lambda name: fxn(name) + 1 def test_module_reuse(self): with source_util.create_modules('_temp') as mapping: loader = machinery.SourceFileLoader('_temp', mapping['_temp']) module = loader.load_module('_temp') module_id = id(module) module_dict_id = id(module.__dict__) with open(mapping['_temp'], 'w') as file: file.write("testing_var = 42\n") module = loader.load_module('_temp') self.assertIn('testing_var', module.__dict__, "'testing_var' not in " "{0}".format(list(module.__dict__.keys()))) self.assertEqual(module, sys.modules['_temp']) self.assertEqual(id(module), module_id) self.assertEqual(id(module.__dict__), module_dict_id) def test_state_after_failure(self): # A failed reload should leave the original module intact. attributes = ('__file__', '__path__', '__package__') value = '' name = '_temp' with source_util.create_modules(name) as mapping: orig_module = imp.new_module(name) for attr in attributes: setattr(orig_module, attr, value) with open(mapping[name], 'w') as file: file.write('+++ bad syntax +++') loader = machinery.SourceFileLoader('_temp', mapping['_temp']) with self.assertRaises(SyntaxError): loader.load_module(name) for attr in attributes: self.assertEqual(getattr(orig_module, attr), value) # [syntax error] def test_bad_syntax(self): with source_util.create_modules('_temp') as mapping: with open(mapping['_temp'], 'w') as file: file.write('=') loader = machinery.SourceFileLoader('_temp', mapping['_temp']) with self.assertRaises(SyntaxError): loader.load_module('_temp') self.assertNotIn('_temp', sys.modules) def test_file_from_empty_string_dir(self): # Loading a module found from an empty string entry on sys.path should # not only work, but keep all attributes relative. file_path = '_temp.py' with open(file_path, 'w') as file: file.write("# test file for importlib") try: with util.uncache('_temp'): loader = machinery.SourceFileLoader('_temp', file_path) mod = loader.load_module('_temp') self.assertEqual(file_path, mod.__file__) self.assertEqual(imp.cache_from_source(file_path), mod.__cached__) finally: os.unlink(file_path) pycache = os.path.dirname(imp.cache_from_source(file_path)) if os.path.exists(pycache): shutil.rmtree(pycache) def test_timestamp_overflow(self): # When a modification timestamp is larger than 2**32, it should be # truncated rather than raise an OverflowError. with source_util.create_modules('_temp') as mapping: source = mapping['_temp'] compiled = imp.cache_from_source(source) with open(source, 'w') as f: f.write("x = 5") try: os.utime(source, (2 ** 33 - 5, 2 ** 33 - 5)) except OverflowError: self.skipTest("cannot set modification time to large integer") except OSError as e: if e.errno != getattr(errno, 'EOVERFLOW', None): raise self.skipTest("cannot set modification time to large integer ({})".format(e)) loader = machinery.SourceFileLoader('_temp', mapping['_temp']) mod = loader.load_module('_temp') # Sanity checks. self.assertEqual(mod.__cached__, compiled) self.assertEqual(mod.x, 5) # The pyc file was created. os.stat(compiled) class BadBytecodeTest(unittest.TestCase): def import_(self, file, module_name): loader = self.loader(module_name, file) module = loader.load_module(module_name) self.assertIn(module_name, sys.modules) def manipulate_bytecode(self, name, mapping, manipulator, *, del_source=False): """Manipulate the bytecode of a module by passing it into a callable that returns what to use as the new bytecode.""" try: del sys.modules['_temp'] except KeyError: pass py_compile.compile(mapping[name]) if not del_source: bytecode_path = imp.cache_from_source(mapping[name]) else: os.unlink(mapping[name]) bytecode_path = make_legacy_pyc(mapping[name]) if manipulator: with open(bytecode_path, 'rb') as file: bc = file.read() new_bc = manipulator(bc) with open(bytecode_path, 'wb') as file: if new_bc is not None: file.write(new_bc) return bytecode_path def _test_empty_file(self, test, *, del_source=False): with source_util.create_modules('_temp') as mapping: bc_path = self.manipulate_bytecode('_temp', mapping, lambda bc: b'', del_source=del_source) test('_temp', mapping, bc_path) @source_util.writes_bytecode_files def _test_partial_magic(self, test, *, del_source=False): # When their are less than 4 bytes to a .pyc, regenerate it if # possible, else raise ImportError. with source_util.create_modules('_temp') as mapping: bc_path = self.manipulate_bytecode('_temp', mapping, lambda bc: bc[:3], del_source=del_source) test('_temp', mapping, bc_path) def _test_magic_only(self, test, *, del_source=False): with source_util.create_modules('_temp') as mapping: bc_path = self.manipulate_bytecode('_temp', mapping, lambda bc: bc[:4], del_source=del_source) test('_temp', mapping, bc_path) def _test_partial_timestamp(self, test, *, del_source=False): with source_util.create_modules('_temp') as mapping: bc_path = self.manipulate_bytecode('_temp', mapping, lambda bc: bc[:7], del_source=del_source) test('_temp', mapping, bc_path) def _test_partial_size(self, test, *, del_source=False): with source_util.create_modules('_temp') as mapping: bc_path = self.manipulate_bytecode('_temp', mapping, lambda bc: bc[:11], del_source=del_source) test('_temp', mapping, bc_path) def _test_no_marshal(self, *, del_source=False): with source_util.create_modules('_temp') as mapping: bc_path = self.manipulate_bytecode('_temp', mapping, lambda bc: bc[:12], del_source=del_source) file_path = mapping['_temp'] if not del_source else bc_path with self.assertRaises(EOFError): self.import_(file_path, '_temp') def _test_non_code_marshal(self, *, del_source=False): with source_util.create_modules('_temp') as mapping: bytecode_path = self.manipulate_bytecode('_temp', mapping, lambda bc: bc[:12] + marshal.dumps(b'abcd'), del_source=del_source) file_path = mapping['_temp'] if not del_source else bytecode_path with self.assertRaises(ImportError) as cm: self.import_(file_path, '_temp') self.assertEqual(cm.exception.name, '_temp') self.assertEqual(cm.exception.path, bytecode_path) def _test_bad_marshal(self, *, del_source=False): with source_util.create_modules('_temp') as mapping: bytecode_path = self.manipulate_bytecode('_temp', mapping, lambda bc: bc[:12] + b'', del_source=del_source) file_path = mapping['_temp'] if not del_source else bytecode_path with self.assertRaises(EOFError): self.import_(file_path, '_temp') def _test_bad_magic(self, test, *, del_source=False): with source_util.create_modules('_temp') as mapping: bc_path = self.manipulate_bytecode('_temp', mapping, lambda bc: b'\x00\x00\x00\x00' + bc[4:]) test('_temp', mapping, bc_path) class SourceLoaderBadBytecodeTest(BadBytecodeTest): loader = machinery.SourceFileLoader @source_util.writes_bytecode_files def test_empty_file(self): # When a .pyc is empty, regenerate it if possible, else raise # ImportError. def test(name, mapping, bytecode_path): self.import_(mapping[name], name) with open(bytecode_path, 'rb') as file: self.assertGreater(len(file.read()), 12) self._test_empty_file(test) def test_partial_magic(self): def test(name, mapping, bytecode_path): self.import_(mapping[name], name) with open(bytecode_path, 'rb') as file: self.assertGreater(len(file.read()), 12) self._test_partial_magic(test) @source_util.writes_bytecode_files def test_magic_only(self): # When there is only the magic number, regenerate the .pyc if possible, # else raise EOFError. def test(name, mapping, bytecode_path): self.import_(mapping[name], name) with open(bytecode_path, 'rb') as file: self.assertGreater(len(file.read()), 12) self._test_magic_only(test) @source_util.writes_bytecode_files def test_bad_magic(self): # When the magic number is different, the bytecode should be # regenerated. def test(name, mapping, bytecode_path): self.import_(mapping[name], name) with open(bytecode_path, 'rb') as bytecode_file: self.assertEqual(bytecode_file.read(4), imp.get_magic()) self._test_bad_magic(test) @source_util.writes_bytecode_files def test_partial_timestamp(self): # When the timestamp is partial, regenerate the .pyc, else # raise EOFError. def test(name, mapping, bc_path): self.import_(mapping[name], name) with open(bc_path, 'rb') as file: self.assertGreater(len(file.read()), 12) self._test_partial_timestamp(test) @source_util.writes_bytecode_files def test_partial_size(self): # When the size is partial, regenerate the .pyc, else # raise EOFError. def test(name, mapping, bc_path): self.import_(mapping[name], name) with open(bc_path, 'rb') as file: self.assertGreater(len(file.read()), 12) self._test_partial_size(test) @source_util.writes_bytecode_files def test_no_marshal(self): # When there is only the magic number and timestamp, raise EOFError. self._test_no_marshal() @source_util.writes_bytecode_files def test_non_code_marshal(self): self._test_non_code_marshal() # XXX ImportError when sourceless # [bad marshal] @source_util.writes_bytecode_files def test_bad_marshal(self): # Bad marshal data should raise a ValueError. self._test_bad_marshal() # [bad timestamp] @source_util.writes_bytecode_files def test_old_timestamp(self): # When the timestamp is older than the source, bytecode should be # regenerated. zeros = b'\x00\x00\x00\x00' with source_util.create_modules('_temp') as mapping: py_compile.compile(mapping['_temp']) bytecode_path = imp.cache_from_source(mapping['_temp']) with open(bytecode_path, 'r+b') as bytecode_file: bytecode_file.seek(4) bytecode_file.write(zeros) self.import_(mapping['_temp'], '_temp') source_mtime = os.path.getmtime(mapping['_temp']) source_timestamp = importlib._w_long(source_mtime) with open(bytecode_path, 'rb') as bytecode_file: bytecode_file.seek(4) self.assertEqual(bytecode_file.read(4), source_timestamp) # [bytecode read-only] @source_util.writes_bytecode_files def test_read_only_bytecode(self): # When bytecode is read-only but should be rewritten, fail silently. with source_util.create_modules('_temp') as mapping: # Create bytecode that will need to be re-created. py_compile.compile(mapping['_temp']) bytecode_path = imp.cache_from_source(mapping['_temp']) with open(bytecode_path, 'r+b') as bytecode_file: bytecode_file.seek(0) bytecode_file.write(b'\x00\x00\x00\x00') # Make the bytecode read-only. os.chmod(bytecode_path, stat.S_IRUSR | stat.S_IRGRP | stat.S_IROTH) try: # Should not raise IOError! self.import_(mapping['_temp'], '_temp') finally: # Make writable for eventual clean-up. os.chmod(bytecode_path, stat.S_IWUSR) class SourcelessLoaderBadBytecodeTest(BadBytecodeTest): loader = machinery.SourcelessFileLoader def test_empty_file(self): def test(name, mapping, bytecode_path): with self.assertRaises(ImportError) as cm: self.import_(bytecode_path, name) self.assertEqual(cm.exception.name, name) self.assertEqual(cm.exception.path, bytecode_path) self._test_empty_file(test, del_source=True) def test_partial_magic(self): def test(name, mapping, bytecode_path): with self.assertRaises(ImportError) as cm: self.import_(bytecode_path, name) self.assertEqual(cm.exception.name, name) self.assertEqual(cm.exception.path, bytecode_path) self._test_partial_magic(test, del_source=True) def test_magic_only(self): def test(name, mapping, bytecode_path): with self.assertRaises(EOFError): self.import_(bytecode_path, name) self._test_magic_only(test, del_source=True) def test_bad_magic(self): def test(name, mapping, bytecode_path): with self.assertRaises(ImportError) as cm: self.import_(bytecode_path, name) self.assertEqual(cm.exception.name, name) self.assertEqual(cm.exception.path, bytecode_path) self._test_bad_magic(test, del_source=True) def test_partial_timestamp(self): def test(name, mapping, bytecode_path): with self.assertRaises(EOFError): self.import_(bytecode_path, name) self._test_partial_timestamp(test, del_source=True) def test_partial_size(self): def test(name, mapping, bytecode_path): with self.assertRaises(EOFError): self.import_(bytecode_path, name) self._test_partial_size(test, del_source=True) def test_no_marshal(self): self._test_no_marshal(del_source=True) def test_non_code_marshal(self): self._test_non_code_marshal(del_source=True) def test_main(): from test.support import run_unittest run_unittest(SimpleTest, SourceLoaderBadBytecodeTest, SourcelessLoaderBadBytecodeTest ) if __name__ == '__main__': test_main()