@ -34,6 +34,34 @@ non-essential code in order to reduce its size, since it is also serves as the
bootstrap implementation sent to every new slave context .
"""
import sys
try :
import _frozen_importlib_external
except ImportError :
pass
else :
class MonkeyPatchedPathFinder ( _frozen_importlib_external . PathFinder ) :
"""
Meta path finder for sys . path and package __path__ attributes .
Patched for https : / / github . com / python / cpython / issues / 115911.
"""
@classmethod
def _path_importer_cache ( cls , path ) :
if path == ' ' :
try :
path = _frozen_importlib_external . _os . getcwd ( )
except ( FileNotFoundError , PermissionError ) :
return None
return super ( ) . _path_importer_cache ( path )
if sys . version_info [ : 2 ] < = ( 3 , 12 ) :
for i , mpf in enumerate ( sys . meta_path ) :
if mpf is _frozen_importlib_external . PathFinder :
sys . meta_path [ i ] = MonkeyPatchedPathFinder
del i , mpf
import binascii
import collections
import encodings . latin_1
@ -49,17 +77,21 @@ import pstats
import signal
import socket
import struct
import sys
import syslog
import threading
import time
import traceback
import types
import warnings
import weakref
import zlib
# Python >3.7 deprecated the imp module.
warnings . filterwarnings ( ' ignore ' , message = ' the imp module is deprecated ' )
try :
# Python >= 3.4, PEP 451 ModuleSpec API
import importlib . machinery
import importlib . util
except ImportError :
# Python < 3.4, PEP 302 Import Hooks
import imp
# Absolute imports for <2.5.
@ -1353,6 +1385,19 @@ class Importer(object):
def __repr__ ( self ) :
return ' Importer '
@staticmethod
def _loader_from_module ( module , default = None ) :
""" Return the loader for a module object. """
try :
return module . __spec__ . loader
except AttributeError :
pass
try :
return module . __loader__
except AttributeError :
pass
return default
def builtin_find_module ( self , fullname ) :
# imp.find_module() will always succeed for __main__, because it is a
# built-in module. That means it exists on a special linked list deep
@ -1360,12 +1405,19 @@ class Importer(object):
if fullname == ' __main__ ' :
raise ModuleNotFoundError ( )
# For a module inside a package (e.g. pkg_a.mod_b) use the search path
# of that package (e.g. ['/usr/lib/python3.11/site-packages/pkg_a']).
parent , _ , modname = str_rpartition ( fullname , ' . ' )
if parent :
path = sys . modules [ parent ] . __path__
else :
path = None
# For a top-level module search builtin modules, frozen modules,
# system specific locations (e.g. Windows registry, site-packages).
# Otherwise use search path of the parent package.
# Works for both stdlib modules & third-party modules.
# If the search is unsuccessful then raises ImportError.
fp , pathname , description = imp . find_module ( modname , path )
if fp :
fp . close ( )
@ -1377,8 +1429,9 @@ class Importer(object):
Implements importlib . abc . MetaPathFinder . find_module ( ) .
Deprecrated in Python 3.4 + , replaced by find_spec ( ) .
Raises ImportWarning in Python 3.10 + .
Removed in Python 3.12 .
fullname A ( fully qualified ? ) module name , e . g . " os.path " .
fullname Fully qualified module name , e . g . " os.path " .
path __path__ of parent packge . None for a top level module .
"""
if hasattr ( _tls , ' running ' ) :
@ -1388,14 +1441,13 @@ class Importer(object):
try :
#_v and self._log.debug('Python requested %r', fullname)
fullname = to_text ( fullname )
pkgname , dot, _ = str_rpartition ( fullname , ' . ' )
pkgname , _, suffix = str_rpartition ( fullname , ' . ' )
pkg = sys . modules . get ( pkgname )
if pkgname and getattr ( pkg , ' __loader__ ' , None ) is not self :
self . _log . debug ( ' %s is submodule of a locally loaded package ' ,
fullname )
return None
suffix = fullname [ len ( pkgname + dot ) : ]
if pkgname and suffix not in self . _present . get ( pkgname , ( ) ) :
self . _log . debug ( ' %s has no submodule %s ' , pkgname , suffix )
return None
@ -1415,6 +1467,66 @@ class Importer(object):
finally :
del _tls . running
def find_spec ( self , fullname , path , target = None ) :
"""
Return a ` ModuleSpec ` for module with ` fullname ` if we will load it .
Otherwise return ` None ` , allowing other finders to try .
fullname Fully qualified name of the module ( e . g . foo . bar . baz )
path Path entries to search . None for a top - level module .
target Existing module to be reloaded ( if any ) .
Implements importlib . abc . MetaPathFinder . find_spec ( )
Python 3.4 + .
"""
# Presence of _tls.running indicates we've re-invoked importlib.
# Abort early to prevent infinite recursion. See below.
if hasattr ( _tls , ' running ' ) :
return None
log = self . _log . getChild ( ' find_spec ' )
if fullname . endswith ( ' . ' ) :
return None
pkgname , _ , modname = fullname . rpartition ( ' . ' )
if pkgname and modname not in self . _present . get ( pkgname , ( ) ) :
log . debug ( ' Skipping %s . Parent %s has no submodule %s ' ,
fullname , pkgname , modname )
return None
pkg = sys . modules . get ( pkgname )
pkg_loader = self . _loader_from_module ( pkg )
if pkgname and pkg_loader is not self :
log . debug ( ' Skipping %s . Parent %s was loaded by %r ' ,
fullname , pkgname , pkg_loader )
return None
# #114: whitelisted prefixes override any system-installed package.
if self . whitelist != [ ' ' ] :
if any ( s and fullname . startswith ( s ) for s in self . whitelist ) :
log . debug ( ' Handling %s . It is whitelisted ' , fullname )
return importlib . machinery . ModuleSpec ( fullname , loader = self )
if fullname == ' __main__ ' :
log . debug ( ' Handling %s . A special case ' , fullname )
return importlib . machinery . ModuleSpec ( fullname , loader = self )
# Re-invoke the import machinery to allow other finders to try.
# Set a guard, so we don't infinitely recurse. See top of this method.
_tls . running = True
try :
spec = importlib . util . _find_spec ( fullname , path , target )
finally :
del _tls . running
if spec :
log . debug ( ' Skipping %s . Available as %r ' , fullname , spec )
return spec
log . debug ( ' Handling %s . Unavailable locally ' , fullname )
return importlib . machinery . ModuleSpec ( fullname , loader = self )
blacklisted_msg = (
' %r is present in the Mitogen importer blacklist, therefore this '
' context will not attempt to request it from the master, as the '
@ -1501,6 +1613,64 @@ class Importer(object):
if present :
callback ( )
def create_module ( self , spec ) :
"""
Return a module object for the given ModuleSpec .
Implements PEP - 451 importlib . abc . Loader API introduced in Python 3.4 .
Unlike Loader . load_module ( ) this shouldn ' t populate sys.modules or
set module attributes . Both are done by Python .
"""
self . _log . debug ( ' Creating module for %r ' , spec )
# FIXME Should this be done in find_spec()? Can it?
self . _refuse_imports ( spec . name )
# FIXME "create_module() should properly handle the case where it is
# called more than once for the same spec/module." -- PEP-451
event = threading . Event ( )
self . _request_module ( spec . name , callback = event . set )
event . wait ( )
# 0:fullname 1:pkg_present 2:path 3:compressed 4:related
_ , pkg_present , path , _ , _ = self . _cache [ spec . name ]
if path is None :
raise ImportError ( self . absent_msg % ( spec . name ) )
spec . origin = self . get_filename ( spec . name )
if pkg_present is not None :
# TODO Namespace packages
spec . submodule_search_locations = [ ]
self . _present [ spec . name ] = pkg_present
module = types . ModuleType ( spec . name )
# FIXME create_module() shouldn't initialise module attributes
module . __file__ = spec . origin
return module
def exec_module ( self , module ) :
"""
Execute the module to initialise it . Don ' t return anything.
Implements PEP - 451 importlib . abc . Loader API , introduced in Python 3.4 .
"""
name = module . __spec__ . name
origin = module . __spec__ . origin
self . _log . debug ( ' Executing %s from %s ' , name , origin )
source = self . get_source ( name )
try :
# Compile the source into a code object. Don't add any __future__
# flags and don't inherit any from this module.
# FIXME Should probably be exposed as get_code()
code = compile ( source , origin , ' exec ' , flags = 0 , dont_inherit = True )
except SyntaxError :
# FIXME Why is this LOG, rather than self._log?
LOG . exception ( ' while importing %r ' , name )
raise
exec ( code , module . __dict__ )
def load_module ( self , fullname ) :
"""
Return the loaded module specified by fullname .
@ -1516,11 +1686,11 @@ class Importer(object):
self . _request_module ( fullname , event . set )
event . wait ( )
ret = self . _cache [ fullname ]
if ret [ 2 ] is None :
# 0:fullname 1:pkg_present 2:path 3:compressed 4:related
_ , pkg_present , path , _ , _ = self . _cache [ fullname ]
if path is None :
raise ModuleNotFoundError ( self . absent_msg % ( fullname , ) )
pkg_present = ret [ 1 ]
mod = sys . modules . setdefault ( fullname , imp . new_module ( fullname ) )
mod . __file__ = self . get_filename ( fullname )
mod . __loader__ = self
@ -3921,7 +4091,7 @@ class ExternalContext(object):
def _setup_package ( self ) :
global mitogen
mitogen = imp. new_modul e( ' mitogen ' )
mitogen = types. ModuleTyp e( ' mitogen ' )
mitogen . __package__ = ' mitogen '
mitogen . __path__ = [ ]
mitogen . __loader__ = self . importer
Alex Willmer
8 months ago
committed by