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bpo-35936: Updates to modulefinder (GH-11787)
* Properly handle SyntaxErrors in Python source files. SyntaxErrors in the target module will rise normally, while SyntaxErrors in dependencies will be added to badmodules. This includes a new regression test. * Fix name collision bug. This fixes an issue where a "fromlist" import with the same name as a previously failed import would be incorrectly added to badmodules. This includes a new regression test. * Replace mutable default values. Bound empty lists have been replaced with the "if param is None" idiom. * Replace deprecated imp usage. Constants imported from imp have been moved to private module-level constants, and ModuleFinder.find_module has been refactored to use importlib. Other than an improvement on how frozen builtin imports are reported (as the frozen imports they are, rather than the stdlib modules they *may* have originated from), these changes maintain complete compatibility with past versions... including odd behavior for returning relative (below current directory, but not a C extension) vs. absolute (above current directory, or a C extension) paths. Patch by Brandt Bucher.
This commit is contained in:
Brandt Bucher
Nick Coghlan
parent
2dad96013c
commit
9d7b2c0909
@ -8,9 +8,7 @@ import os
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import sys
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import types
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import warnings
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with warnings.catch_warnings():
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warnings.simplefilter('ignore', DeprecationWarning)
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import imp
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LOAD_CONST = dis.opmap['LOAD_CONST']
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IMPORT_NAME = dis.opmap['IMPORT_NAME']
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@ -19,6 +17,16 @@ STORE_GLOBAL = dis.opmap['STORE_GLOBAL']
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STORE_OPS = STORE_NAME, STORE_GLOBAL
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EXTENDED_ARG = dis.EXTENDED_ARG
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# Old imp constants:
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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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_PKG_DIRECTORY = 5
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_C_BUILTIN = 6
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_PY_FROZEN = 7
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# Modulefinder does a good job at simulating Python's, but it can not
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# handle __path__ modifications packages make at runtime. Therefore there
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# is a mechanism whereby you can register extra paths in this map for a
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@ -43,6 +51,54 @@ def ReplacePackage(oldname, newname):
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replacePackageMap[oldname] = newname
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def _find_module(name, path=None):
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"""An importlib reimplementation of imp.find_module (for our purposes)."""
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# It's necessary to clear the caches for our Finder first, in case any
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# modules are being added/deleted/modified at runtime. In particular,
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# test_modulefinder.py changes file tree contents in a cache-breaking way:
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importlib.machinery.PathFinder.invalidate_caches()
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spec = importlib.machinery.PathFinder.find_spec(name, path)
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if spec is None:
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raise ImportError("No module named {name!r}".format(name=name), name=name)
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# Some special cases:
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if spec.loader is importlib.machinery.BuiltinImporter:
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return None, None, ("", "", _C_BUILTIN)
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if spec.loader is importlib.machinery.FrozenImporter:
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return None, None, ("", "", _PY_FROZEN)
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file_path = spec.origin
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if spec.loader.is_package(name):
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return None, os.path.dirname(file_path), ("", "", _PKG_DIRECTORY)
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if isinstance(spec.loader, importlib.machinery.SourceFileLoader):
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kind = _PY_SOURCE
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mode = "r"
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elif isinstance(spec.loader, importlib.machinery.ExtensionFileLoader):
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kind = _C_EXTENSION
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mode = "rb"
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elif isinstance(spec.loader, importlib.machinery.SourcelessFileLoader):
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kind = _PY_COMPILED
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mode = "rb"
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else: # Should never happen.
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return None, None, ("", "", _SEARCH_ERROR)
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file = open(file_path, mode)
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suffix = os.path.splitext(file_path)[-1]
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return file, file_path, (suffix, mode, kind)
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class Module:
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def __init__(self, name, file=None, path=None):
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@ -69,7 +125,7 @@ class Module:
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class ModuleFinder:
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def __init__(self, path=None, debug=0, excludes=[], replace_paths=[]):
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def __init__(self, path=None, debug=0, excludes=None, replace_paths=None):
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if path is None:
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path = sys.path
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self.path = path
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@ -77,8 +133,8 @@ class ModuleFinder:
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self.badmodules = {}
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self.debug = debug
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self.indent = 0
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self.excludes = excludes
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self.replace_paths = replace_paths
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self.excludes = excludes if excludes is not None else []
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self.replace_paths = replace_paths if replace_paths is not None else []
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self.processed_paths = [] # Used in debugging only
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def msg(self, level, str, *args):
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@ -105,14 +161,14 @@ class ModuleFinder:
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def run_script(self, pathname):
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self.msg(2, "run_script", pathname)
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with open(pathname) as fp:
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stuff = ("", "r", imp.PY_SOURCE)
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stuff = ("", "r", _PY_SOURCE)
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self.load_module('__main__', fp, pathname, stuff)
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def load_file(self, pathname):
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dir, name = os.path.split(pathname)
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name, ext = os.path.splitext(name)
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with open(pathname) as fp:
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stuff = (ext, "r", imp.PY_SOURCE)
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stuff = (ext, "r", _PY_SOURCE)
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self.load_module(name, fp, pathname, stuff)
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def import_hook(self, name, caller=None, fromlist=None, level=-1):
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@ -279,13 +335,13 @@ class ModuleFinder:
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def load_module(self, fqname, fp, pathname, file_info):
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suffix, mode, type = file_info
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self.msgin(2, "load_module", fqname, fp and "fp", pathname)
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if type == imp.PKG_DIRECTORY:
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if type == _PKG_DIRECTORY:
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m = self.load_package(fqname, pathname)
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self.msgout(2, "load_module ->", m)
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return m
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if type == imp.PY_SOURCE:
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if type == _PY_SOURCE:
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co = compile(fp.read()+'\n', pathname, 'exec')
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elif type == imp.PY_COMPILED:
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elif type == _PY_COMPILED:
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try:
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data = fp.read()
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importlib._bootstrap_external._classify_pyc(data, fqname, {})
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@ -323,17 +379,20 @@ class ModuleFinder:
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except ImportError as msg:
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self.msg(2, "ImportError:", str(msg))
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self._add_badmodule(name, caller)
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except SyntaxError as msg:
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self.msg(2, "SyntaxError:", str(msg))
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self._add_badmodule(name, caller)
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else:
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if fromlist:
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for sub in fromlist:
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if sub in self.badmodules:
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self._add_badmodule(sub, caller)
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fullname = name + "." + sub
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if fullname in self.badmodules:
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self._add_badmodule(fullname, caller)
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continue
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try:
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self.import_hook(name, caller, [sub], level=level)
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except ImportError as msg:
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self.msg(2, "ImportError:", str(msg))
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fullname = name + "." + sub
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self._add_badmodule(fullname, caller)
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def scan_opcodes(self, co):
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@ -445,10 +504,11 @@ class ModuleFinder:
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if path is None:
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if name in sys.builtin_module_names:
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return (None, None, ("", "", imp.C_BUILTIN))
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return (None, None, ("", "", _C_BUILTIN))
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path = self.path
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return imp.find_module(name, path)
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return _find_module(name, path)
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def report(self):
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"""Print a report to stdout, listing the found modules with their
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@ -218,6 +218,33 @@ bytecode_test = [
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""
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]
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syntax_error_test = [
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"a.module",
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["a", "a.module", "b"],
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["b.module"], [],
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"""\
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a/__init__.py
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a/module.py
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import b.module
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b/__init__.py
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b/module.py
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? # SyntaxError: invalid syntax
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"""]
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same_name_as_bad_test = [
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"a.module",
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["a", "a.module", "b", "b.c"],
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["c"], [],
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"""\
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a/__init__.py
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a/module.py
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import c
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from b import c
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b/__init__.py
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b/c.py
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"""]
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def open_file(path):
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dirname = os.path.dirname(path)
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@ -299,6 +326,12 @@ class ModuleFinderTest(unittest.TestCase):
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def test_relative_imports_4(self):
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self._do_test(relative_import_test_4)
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def test_syntax_error(self):
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self._do_test(syntax_error_test)
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def test_same_name_as_bad(self):
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self._do_test(same_name_as_bad_test)
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def test_bytecode(self):
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base_path = os.path.join(TEST_DIR, 'a')
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source_path = base_path + importlib.machinery.SOURCE_SUFFIXES[0]
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@ -222,6 +222,7 @@ Ian Bruntlett
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Floris Bruynooghe
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Matt Bryant
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Stan Bubrouski
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Brandt Bucher
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Colm Buckley
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Erik de Bueger
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Jan-Hein Bührman
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@ -0,0 +1,2 @@
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:mod:`modulefinder` no longer crashes when encountering syntax errors in followed imports.
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Patch by Brandt Bucher.
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@ -0,0 +1,2 @@
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:mod:`modulefinder` correctly handles modules that have the same name as a bad package.
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Patch by Brandt Bucher.
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@ -0,0 +1,2 @@
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:mod:`modulefinder` no longer depends on the deprecated :mod:`imp` module, and the initializer for :class:`modulefinder.ModuleFinder` now has immutable default arguments.
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Patch by Brandt Bucher.
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