mirror of
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bb0cf8fd60
This is related to fixing the refleaks introduced by commit 096d009. I haven't been able to find the leak yet, but these changes are a consequence of that effort. This includes some cleanup, some tweaks to the existing tests, and a bunch of new test cases. The only change here that might have impact outside the tests in question is in imp.py, where I update imp.load_dynamic() to use spec_from_file_location() instead of creating a ModuleSpec directly.
Also note that I've updated the tests to only skip if we're checking for refleaks (regrtest's --huntrleaks), whereas in gh-101969 I had skipped the tests entirely. The tests will be useful for some upcoming work and I'd rather the refleaks not hold that up. (It isn't clear how quickly we'll be able to fix the leaking code, though it will certainly be done in the short term.)
https://github.com/python/cpython/issues/102251
347 lines
10 KiB
Python
347 lines
10 KiB
Python
"""This module provides the components needed to build your own __import__
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function. Undocumented functions are obsolete.
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In most cases it is preferred you consider using the importlib module's
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functionality over this module.
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"""
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# (Probably) need to stay in _imp
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from _imp import (lock_held, acquire_lock, release_lock,
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get_frozen_object, is_frozen_package,
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init_frozen, is_builtin, is_frozen,
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_fix_co_filename, _frozen_module_names)
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try:
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from _imp import create_dynamic
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except ImportError:
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# Platform doesn't support dynamic loading.
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create_dynamic = None
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from importlib._bootstrap import _ERR_MSG, _exec, _load, _builtin_from_name
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from importlib._bootstrap_external import SourcelessFileLoader
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from importlib import machinery
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from importlib import util
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import importlib
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import os
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import sys
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import tokenize
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import types
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import warnings
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warnings.warn("the imp module is deprecated in favour of importlib and slated "
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"for removal in Python 3.12; "
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"see the module's documentation for alternative uses",
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DeprecationWarning, stacklevel=2)
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# DEPRECATED
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SEARCH_ERROR = 0
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PY_SOURCE = 1
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PY_COMPILED = 2
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C_EXTENSION = 3
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PY_RESOURCE = 4
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PKG_DIRECTORY = 5
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C_BUILTIN = 6
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PY_FROZEN = 7
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PY_CODERESOURCE = 8
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IMP_HOOK = 9
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def new_module(name):
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"""**DEPRECATED**
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Create a new module.
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The module is not entered into sys.modules.
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"""
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return types.ModuleType(name)
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def get_magic():
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"""**DEPRECATED**
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Return the magic number for .pyc files.
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"""
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return util.MAGIC_NUMBER
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def get_tag():
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"""Return the magic tag for .pyc files."""
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return sys.implementation.cache_tag
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def cache_from_source(path, debug_override=None):
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"""**DEPRECATED**
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Given the path to a .py file, return the path to its .pyc file.
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The .py file does not need to exist; this simply returns the path to the
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.pyc file calculated as if the .py file were imported.
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If debug_override is not None, then it must be a boolean and is used in
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place of sys.flags.optimize.
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If sys.implementation.cache_tag is None then NotImplementedError is raised.
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"""
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with warnings.catch_warnings():
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warnings.simplefilter('ignore')
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return util.cache_from_source(path, debug_override)
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def source_from_cache(path):
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"""**DEPRECATED**
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Given the path to a .pyc. file, return the path to its .py file.
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The .pyc file does not need to exist; this simply returns the path to
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the .py file calculated to correspond to the .pyc file. If path does
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not conform to PEP 3147 format, ValueError will be raised. If
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sys.implementation.cache_tag is None then NotImplementedError is raised.
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"""
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return util.source_from_cache(path)
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def get_suffixes():
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"""**DEPRECATED**"""
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extensions = [(s, 'rb', C_EXTENSION) for s in machinery.EXTENSION_SUFFIXES]
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source = [(s, 'r', PY_SOURCE) for s in machinery.SOURCE_SUFFIXES]
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bytecode = [(s, 'rb', PY_COMPILED) for s in machinery.BYTECODE_SUFFIXES]
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return extensions + source + bytecode
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class NullImporter:
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"""**DEPRECATED**
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Null import object.
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"""
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def __init__(self, path):
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if path == '':
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raise ImportError('empty pathname', path='')
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elif os.path.isdir(path):
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raise ImportError('existing directory', path=path)
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def find_module(self, fullname):
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"""Always returns None."""
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return None
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class _HackedGetData:
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"""Compatibility support for 'file' arguments of various load_*()
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functions."""
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def __init__(self, fullname, path, file=None):
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super().__init__(fullname, path)
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self.file = file
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def get_data(self, path):
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"""Gross hack to contort loader to deal w/ load_*()'s bad API."""
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if self.file and path == self.path:
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# The contract of get_data() requires us to return bytes. Reopen the
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# file in binary mode if needed.
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if not self.file.closed:
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file = self.file
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if 'b' not in file.mode:
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file.close()
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if self.file.closed:
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self.file = file = open(self.path, 'rb')
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with file:
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return file.read()
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else:
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return super().get_data(path)
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class _LoadSourceCompatibility(_HackedGetData, machinery.SourceFileLoader):
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"""Compatibility support for implementing load_source()."""
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def load_source(name, pathname, file=None):
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loader = _LoadSourceCompatibility(name, pathname, file)
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spec = util.spec_from_file_location(name, pathname, loader=loader)
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if name in sys.modules:
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module = _exec(spec, sys.modules[name])
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else:
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module = _load(spec)
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# To allow reloading to potentially work, use a non-hacked loader which
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# won't rely on a now-closed file object.
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module.__loader__ = machinery.SourceFileLoader(name, pathname)
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module.__spec__.loader = module.__loader__
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return module
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class _LoadCompiledCompatibility(_HackedGetData, SourcelessFileLoader):
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"""Compatibility support for implementing load_compiled()."""
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def load_compiled(name, pathname, file=None):
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"""**DEPRECATED**"""
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loader = _LoadCompiledCompatibility(name, pathname, file)
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spec = util.spec_from_file_location(name, pathname, loader=loader)
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if name in sys.modules:
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module = _exec(spec, sys.modules[name])
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else:
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module = _load(spec)
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# To allow reloading to potentially work, use a non-hacked loader which
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# won't rely on a now-closed file object.
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module.__loader__ = SourcelessFileLoader(name, pathname)
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module.__spec__.loader = module.__loader__
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return module
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def load_package(name, path):
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"""**DEPRECATED**"""
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if os.path.isdir(path):
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extensions = (machinery.SOURCE_SUFFIXES[:] +
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machinery.BYTECODE_SUFFIXES[:])
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for extension in extensions:
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init_path = os.path.join(path, '__init__' + extension)
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if os.path.exists(init_path):
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path = init_path
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break
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else:
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raise ValueError('{!r} is not a package'.format(path))
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spec = util.spec_from_file_location(name, path,
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submodule_search_locations=[])
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if name in sys.modules:
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return _exec(spec, sys.modules[name])
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else:
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return _load(spec)
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def load_module(name, file, filename, details):
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"""**DEPRECATED**
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Load a module, given information returned by find_module().
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The module name must include the full package name, if any.
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"""
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suffix, mode, type_ = details
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if mode and (not mode.startswith('r') or '+' in mode):
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raise ValueError('invalid file open mode {!r}'.format(mode))
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elif file is None and type_ in {PY_SOURCE, PY_COMPILED}:
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msg = 'file object required for import (type code {})'.format(type_)
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raise ValueError(msg)
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elif type_ == PY_SOURCE:
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return load_source(name, filename, file)
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elif type_ == PY_COMPILED:
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return load_compiled(name, filename, file)
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elif type_ == C_EXTENSION and load_dynamic is not None:
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if file is None:
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with open(filename, 'rb') as opened_file:
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return load_dynamic(name, filename, opened_file)
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else:
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return load_dynamic(name, filename, file)
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elif type_ == PKG_DIRECTORY:
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return load_package(name, filename)
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elif type_ == C_BUILTIN:
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return init_builtin(name)
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elif type_ == PY_FROZEN:
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return init_frozen(name)
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else:
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msg = "Don't know how to import {} (type code {})".format(name, type_)
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raise ImportError(msg, name=name)
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def find_module(name, path=None):
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"""**DEPRECATED**
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Search for a module.
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If path is omitted or None, search for a built-in, frozen or special
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module and continue search in sys.path. The module name cannot
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contain '.'; to search for a submodule of a package, pass the
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submodule name and the package's __path__.
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"""
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if not isinstance(name, str):
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raise TypeError("'name' must be a str, not {}".format(type(name)))
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elif not isinstance(path, (type(None), list)):
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# Backwards-compatibility
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raise RuntimeError("'path' must be None or a list, "
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"not {}".format(type(path)))
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if path is None:
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if is_builtin(name):
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return None, None, ('', '', C_BUILTIN)
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elif is_frozen(name):
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return None, None, ('', '', PY_FROZEN)
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else:
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path = sys.path
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for entry in path:
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package_directory = os.path.join(entry, name)
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for suffix in ['.py', machinery.BYTECODE_SUFFIXES[0]]:
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package_file_name = '__init__' + suffix
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file_path = os.path.join(package_directory, package_file_name)
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if os.path.isfile(file_path):
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return None, package_directory, ('', '', PKG_DIRECTORY)
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for suffix, mode, type_ in get_suffixes():
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file_name = name + suffix
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file_path = os.path.join(entry, file_name)
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if os.path.isfile(file_path):
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break
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else:
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continue
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break # Break out of outer loop when breaking out of inner loop.
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else:
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raise ImportError(_ERR_MSG.format(name), name=name)
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encoding = None
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if 'b' not in mode:
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with open(file_path, 'rb') as file:
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encoding = tokenize.detect_encoding(file.readline)[0]
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file = open(file_path, mode, encoding=encoding)
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return file, file_path, (suffix, mode, type_)
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def reload(module):
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"""**DEPRECATED**
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Reload the module and return it.
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The module must have been successfully imported before.
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"""
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return importlib.reload(module)
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def init_builtin(name):
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"""**DEPRECATED**
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Load and return a built-in module by name, or None is such module doesn't
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exist
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"""
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try:
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return _builtin_from_name(name)
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except ImportError:
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return None
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if create_dynamic:
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def load_dynamic(name, path, file=None):
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"""**DEPRECATED**
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Load an extension module.
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"""
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import importlib.machinery
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loader = importlib.machinery.ExtensionFileLoader(name, path)
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# Issue #24748: Skip the sys.modules check in _load_module_shim;
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# always load new extension
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spec = importlib.util.spec_from_file_location(
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name, path, loader=loader)
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return _load(spec)
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else:
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load_dynamic = None
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