mirror of
https://github.com/python/cpython.git
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35d5068928
* bpo-43428: Sync with importlib_metadata 3.7.3 (16ac3a95) * Add 'versionadded' for importlib.metadata.packages_distributions * Add section in what's new for Python 3.10 highlighting most salient changes and relevant backport.
840 lines
24 KiB
Python
840 lines
24 KiB
Python
import os
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import re
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import abc
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import csv
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import sys
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import email
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import pathlib
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import zipfile
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import operator
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import warnings
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import functools
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import itertools
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import posixpath
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import collections
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from ._itertools import unique_everseen
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from configparser import ConfigParser
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from contextlib import suppress
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from importlib import import_module
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from importlib.abc import MetaPathFinder
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from itertools import starmap
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from typing import Any, List, Mapping, Optional, Protocol, TypeVar, Union
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__all__ = [
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'Distribution',
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'DistributionFinder',
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'PackageNotFoundError',
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'distribution',
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'distributions',
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'entry_points',
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'files',
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'metadata',
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'packages_distributions',
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'requires',
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'version',
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]
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class PackageNotFoundError(ModuleNotFoundError):
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"""The package was not found."""
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def __str__(self):
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tmpl = "No package metadata was found for {self.name}"
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return tmpl.format(**locals())
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@property
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def name(self):
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(name,) = self.args
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return name
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class EntryPoint(
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collections.namedtuple('EntryPointBase', 'name value group')):
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"""An entry point as defined by Python packaging conventions.
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See `the packaging docs on entry points
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<https://packaging.python.org/specifications/entry-points/>`_
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for more information.
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"""
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pattern = re.compile(
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r'(?P<module>[\w.]+)\s*'
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r'(:\s*(?P<attr>[\w.]+))?\s*'
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r'(?P<extras>\[.*\])?\s*$'
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)
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"""
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A regular expression describing the syntax for an entry point,
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which might look like:
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- module
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- package.module
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- package.module:attribute
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- package.module:object.attribute
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- package.module:attr [extra1, extra2]
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Other combinations are possible as well.
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The expression is lenient about whitespace around the ':',
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following the attr, and following any extras.
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"""
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dist: Optional['Distribution'] = None
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def load(self):
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"""Load the entry point from its definition. If only a module
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is indicated by the value, return that module. Otherwise,
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return the named object.
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"""
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match = self.pattern.match(self.value)
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module = import_module(match.group('module'))
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attrs = filter(None, (match.group('attr') or '').split('.'))
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return functools.reduce(getattr, attrs, module)
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@property
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def module(self):
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match = self.pattern.match(self.value)
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return match.group('module')
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@property
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def attr(self):
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match = self.pattern.match(self.value)
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return match.group('attr')
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@property
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def extras(self):
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match = self.pattern.match(self.value)
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return list(re.finditer(r'\w+', match.group('extras') or ''))
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@classmethod
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def _from_config(cls, config):
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return (
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cls(name, value, group)
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for group in config.sections()
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for name, value in config.items(group)
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)
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@classmethod
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def _from_text(cls, text):
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config = ConfigParser(delimiters='=')
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# case sensitive: https://stackoverflow.com/q/1611799/812183
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config.optionxform = str
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config.read_string(text)
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return cls._from_config(config)
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def _for(self, dist):
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self.dist = dist
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return self
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def __iter__(self):
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"""
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Supply iter so one may construct dicts of EntryPoints by name.
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"""
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msg = (
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"Construction of dict of EntryPoints is deprecated in "
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"favor of EntryPoints."
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)
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warnings.warn(msg, DeprecationWarning)
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return iter((self.name, self))
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def __reduce__(self):
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return (
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self.__class__,
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(self.name, self.value, self.group),
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)
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def matches(self, **params):
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attrs = (getattr(self, param) for param in params)
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return all(map(operator.eq, params.values(), attrs))
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class EntryPoints(tuple):
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"""
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An immutable collection of selectable EntryPoint objects.
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"""
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__slots__ = ()
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def __getitem__(self, name): # -> EntryPoint:
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"""
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Get the EntryPoint in self matching name.
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"""
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try:
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return next(iter(self.select(name=name)))
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except StopIteration:
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raise KeyError(name)
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def select(self, **params):
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"""
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Select entry points from self that match the
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given parameters (typically group and/or name).
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"""
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return EntryPoints(ep for ep in self if ep.matches(**params))
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@property
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def names(self):
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"""
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Return the set of all names of all entry points.
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"""
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return set(ep.name for ep in self)
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@property
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def groups(self):
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"""
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Return the set of all groups of all entry points.
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For coverage while SelectableGroups is present.
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>>> EntryPoints().groups
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set()
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"""
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return set(ep.group for ep in self)
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@classmethod
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def _from_text_for(cls, text, dist):
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return cls(ep._for(dist) for ep in EntryPoint._from_text(text))
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def flake8_bypass(func):
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# defer inspect import as performance optimization.
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import inspect
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is_flake8 = any('flake8' in str(frame.filename) for frame in inspect.stack()[:5])
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return func if not is_flake8 else lambda: None
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class Deprecated:
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"""
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Compatibility add-in for mapping to indicate that
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mapping behavior is deprecated.
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>>> recwarn = getfixture('recwarn')
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>>> class DeprecatedDict(Deprecated, dict): pass
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>>> dd = DeprecatedDict(foo='bar')
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>>> dd.get('baz', None)
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>>> dd['foo']
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'bar'
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>>> list(dd)
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['foo']
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>>> list(dd.keys())
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['foo']
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>>> 'foo' in dd
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True
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>>> list(dd.values())
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['bar']
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>>> len(recwarn)
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1
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"""
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_warn = functools.partial(
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warnings.warn,
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"SelectableGroups dict interface is deprecated. Use select.",
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DeprecationWarning,
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stacklevel=2,
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)
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def __getitem__(self, name):
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self._warn()
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return super().__getitem__(name)
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def get(self, name, default=None):
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flake8_bypass(self._warn)()
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return super().get(name, default)
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def __iter__(self):
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self._warn()
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return super().__iter__()
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def __contains__(self, *args):
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self._warn()
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return super().__contains__(*args)
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def keys(self):
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self._warn()
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return super().keys()
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def values(self):
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self._warn()
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return super().values()
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class SelectableGroups(dict):
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"""
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A backward- and forward-compatible result from
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entry_points that fully implements the dict interface.
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"""
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@classmethod
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def load(cls, eps):
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by_group = operator.attrgetter('group')
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ordered = sorted(eps, key=by_group)
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grouped = itertools.groupby(ordered, by_group)
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return cls((group, EntryPoints(eps)) for group, eps in grouped)
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@property
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def _all(self):
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"""
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Reconstruct a list of all entrypoints from the groups.
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"""
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return EntryPoints(itertools.chain.from_iterable(self.values()))
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@property
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def groups(self):
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return self._all.groups
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@property
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def names(self):
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"""
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for coverage:
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>>> SelectableGroups().names
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set()
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"""
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return self._all.names
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def select(self, **params):
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if not params:
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return self
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return self._all.select(**params)
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class PackagePath(pathlib.PurePosixPath):
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"""A reference to a path in a package"""
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def read_text(self, encoding='utf-8'):
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with self.locate().open(encoding=encoding) as stream:
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return stream.read()
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def read_binary(self):
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with self.locate().open('rb') as stream:
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return stream.read()
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def locate(self):
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"""Return a path-like object for this path"""
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return self.dist.locate_file(self)
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class FileHash:
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def __init__(self, spec):
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self.mode, _, self.value = spec.partition('=')
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def __repr__(self):
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return '<FileHash mode: {} value: {}>'.format(self.mode, self.value)
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_T = TypeVar("_T")
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class PackageMetadata(Protocol):
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def __len__(self) -> int:
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... # pragma: no cover
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def __contains__(self, item: str) -> bool:
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... # pragma: no cover
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def __getitem__(self, key: str) -> str:
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... # pragma: no cover
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def get_all(self, name: str, failobj: _T = ...) -> Union[List[Any], _T]:
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"""
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Return all values associated with a possibly multi-valued key.
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"""
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class Distribution:
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"""A Python distribution package."""
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@abc.abstractmethod
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def read_text(self, filename):
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"""Attempt to load metadata file given by the name.
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:param filename: The name of the file in the distribution info.
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:return: The text if found, otherwise None.
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"""
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@abc.abstractmethod
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def locate_file(self, path):
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"""
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Given a path to a file in this distribution, return a path
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to it.
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"""
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@classmethod
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def from_name(cls, name):
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"""Return the Distribution for the given package name.
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:param name: The name of the distribution package to search for.
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:return: The Distribution instance (or subclass thereof) for the named
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package, if found.
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:raises PackageNotFoundError: When the named package's distribution
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metadata cannot be found.
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"""
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for resolver in cls._discover_resolvers():
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dists = resolver(DistributionFinder.Context(name=name))
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dist = next(iter(dists), None)
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if dist is not None:
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return dist
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else:
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raise PackageNotFoundError(name)
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@classmethod
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def discover(cls, **kwargs):
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"""Return an iterable of Distribution objects for all packages.
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Pass a ``context`` or pass keyword arguments for constructing
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a context.
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:context: A ``DistributionFinder.Context`` object.
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:return: Iterable of Distribution objects for all packages.
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"""
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context = kwargs.pop('context', None)
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if context and kwargs:
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raise ValueError("cannot accept context and kwargs")
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context = context or DistributionFinder.Context(**kwargs)
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return itertools.chain.from_iterable(
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resolver(context) for resolver in cls._discover_resolvers()
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)
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@staticmethod
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def at(path):
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"""Return a Distribution for the indicated metadata path
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:param path: a string or path-like object
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:return: a concrete Distribution instance for the path
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"""
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return PathDistribution(pathlib.Path(path))
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@staticmethod
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def _discover_resolvers():
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"""Search the meta_path for resolvers."""
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declared = (
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getattr(finder, 'find_distributions', None) for finder in sys.meta_path
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)
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return filter(None, declared)
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@classmethod
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def _local(cls, root='.'):
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from pep517 import build, meta
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system = build.compat_system(root)
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builder = functools.partial(
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meta.build,
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source_dir=root,
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system=system,
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)
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return PathDistribution(zipfile.Path(meta.build_as_zip(builder)))
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@property
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def metadata(self) -> PackageMetadata:
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"""Return the parsed metadata for this Distribution.
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The returned object will have keys that name the various bits of
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metadata. See PEP 566 for details.
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"""
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text = (
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self.read_text('METADATA')
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or self.read_text('PKG-INFO')
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# This last clause is here to support old egg-info files. Its
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# effect is to just end up using the PathDistribution's self._path
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# (which points to the egg-info file) attribute unchanged.
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or self.read_text('')
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)
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return email.message_from_string(text)
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@property
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def name(self):
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"""Return the 'Name' metadata for the distribution package."""
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return self.metadata['Name']
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@property
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def version(self):
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"""Return the 'Version' metadata for the distribution package."""
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return self.metadata['Version']
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@property
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def entry_points(self):
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return EntryPoints._from_text_for(self.read_text('entry_points.txt'), self)
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@property
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def files(self):
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"""Files in this distribution.
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:return: List of PackagePath for this distribution or None
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Result is `None` if the metadata file that enumerates files
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(i.e. RECORD for dist-info or SOURCES.txt for egg-info) is
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missing.
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Result may be empty if the metadata exists but is empty.
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"""
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file_lines = self._read_files_distinfo() or self._read_files_egginfo()
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def make_file(name, hash=None, size_str=None):
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result = PackagePath(name)
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result.hash = FileHash(hash) if hash else None
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result.size = int(size_str) if size_str else None
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result.dist = self
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return result
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return file_lines and list(starmap(make_file, csv.reader(file_lines)))
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def _read_files_distinfo(self):
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"""
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Read the lines of RECORD
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"""
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text = self.read_text('RECORD')
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return text and text.splitlines()
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def _read_files_egginfo(self):
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"""
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SOURCES.txt might contain literal commas, so wrap each line
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in quotes.
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"""
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text = self.read_text('SOURCES.txt')
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return text and map('"{}"'.format, text.splitlines())
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@property
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def requires(self):
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"""Generated requirements specified for this Distribution"""
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reqs = self._read_dist_info_reqs() or self._read_egg_info_reqs()
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return reqs and list(reqs)
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def _read_dist_info_reqs(self):
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return self.metadata.get_all('Requires-Dist')
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def _read_egg_info_reqs(self):
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source = self.read_text('requires.txt')
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return source and self._deps_from_requires_text(source)
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@classmethod
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def _deps_from_requires_text(cls, source):
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section_pairs = cls._read_sections(source.splitlines())
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sections = {
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section: list(map(operator.itemgetter('line'), results))
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for section, results in itertools.groupby(
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section_pairs, operator.itemgetter('section')
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)
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}
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return cls._convert_egg_info_reqs_to_simple_reqs(sections)
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@staticmethod
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def _read_sections(lines):
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section = None
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for line in filter(None, lines):
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section_match = re.match(r'\[(.*)\]$', line)
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if section_match:
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section = section_match.group(1)
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continue
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yield locals()
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@staticmethod
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def _convert_egg_info_reqs_to_simple_reqs(sections):
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"""
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Historically, setuptools would solicit and store 'extra'
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requirements, including those with environment markers,
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in separate sections. More modern tools expect each
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dependency to be defined separately, with any relevant
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extras and environment markers attached directly to that
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requirement. This method converts the former to the
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latter. See _test_deps_from_requires_text for an example.
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"""
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def make_condition(name):
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return name and 'extra == "{name}"'.format(name=name)
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def parse_condition(section):
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section = section or ''
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extra, sep, markers = section.partition(':')
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if extra and markers:
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markers = '({markers})'.format(markers=markers)
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conditions = list(filter(None, [markers, make_condition(extra)]))
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return '; ' + ' and '.join(conditions) if conditions else ''
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for section, deps in sections.items():
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for dep in deps:
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yield dep + parse_condition(section)
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class DistributionFinder(MetaPathFinder):
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"""
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A MetaPathFinder capable of discovering installed distributions.
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"""
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class Context:
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"""
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Keyword arguments presented by the caller to
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``distributions()`` or ``Distribution.discover()``
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to narrow the scope of a search for distributions
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in all DistributionFinders.
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Each DistributionFinder may expect any parameters
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and should attempt to honor the canonical
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parameters defined below when appropriate.
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"""
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name = None
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"""
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Specific name for which a distribution finder should match.
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A name of ``None`` matches all distributions.
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"""
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def __init__(self, **kwargs):
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vars(self).update(kwargs)
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@property
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def path(self):
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"""
|
|
The path that a distribution finder should search.
|
|
|
|
Typically refers to Python package paths and defaults
|
|
to ``sys.path``.
|
|
"""
|
|
return vars(self).get('path', sys.path)
|
|
|
|
@abc.abstractmethod
|
|
def find_distributions(self, context=Context()):
|
|
"""
|
|
Find distributions.
|
|
|
|
Return an iterable of all Distribution instances capable of
|
|
loading the metadata for packages matching the ``context``,
|
|
a DistributionFinder.Context instance.
|
|
"""
|
|
|
|
|
|
class FastPath:
|
|
"""
|
|
Micro-optimized class for searching a path for
|
|
children.
|
|
"""
|
|
|
|
def __init__(self, root):
|
|
self.root = root
|
|
self.base = os.path.basename(self.root).lower()
|
|
|
|
def joinpath(self, child):
|
|
return pathlib.Path(self.root, child)
|
|
|
|
def children(self):
|
|
with suppress(Exception):
|
|
return os.listdir(self.root or '')
|
|
with suppress(Exception):
|
|
return self.zip_children()
|
|
return []
|
|
|
|
def zip_children(self):
|
|
zip_path = zipfile.Path(self.root)
|
|
names = zip_path.root.namelist()
|
|
self.joinpath = zip_path.joinpath
|
|
|
|
return dict.fromkeys(child.split(posixpath.sep, 1)[0] for child in names)
|
|
|
|
def search(self, name):
|
|
return (
|
|
self.joinpath(child)
|
|
for child in self.children()
|
|
if name.matches(child, self.base)
|
|
)
|
|
|
|
|
|
class Prepared:
|
|
"""
|
|
A prepared search for metadata on a possibly-named package.
|
|
"""
|
|
|
|
normalized = None
|
|
suffixes = 'dist-info', 'egg-info'
|
|
exact_matches = [''][:0]
|
|
egg_prefix = ''
|
|
versionless_egg_name = ''
|
|
|
|
def __init__(self, name):
|
|
self.name = name
|
|
if name is None:
|
|
return
|
|
self.normalized = self.normalize(name)
|
|
self.exact_matches = [
|
|
self.normalized + '.' + suffix for suffix in self.suffixes
|
|
]
|
|
legacy_normalized = self.legacy_normalize(self.name)
|
|
self.egg_prefix = legacy_normalized + '-'
|
|
self.versionless_egg_name = legacy_normalized + '.egg'
|
|
|
|
@staticmethod
|
|
def normalize(name):
|
|
"""
|
|
PEP 503 normalization plus dashes as underscores.
|
|
"""
|
|
return re.sub(r"[-_.]+", "-", name).lower().replace('-', '_')
|
|
|
|
@staticmethod
|
|
def legacy_normalize(name):
|
|
"""
|
|
Normalize the package name as found in the convention in
|
|
older packaging tools versions and specs.
|
|
"""
|
|
return name.lower().replace('-', '_')
|
|
|
|
def matches(self, cand, base):
|
|
low = cand.lower()
|
|
# rpartition is faster than splitext and suitable for this purpose.
|
|
pre, _, ext = low.rpartition('.')
|
|
name, _, rest = pre.partition('-')
|
|
return (
|
|
low in self.exact_matches
|
|
or ext in self.suffixes
|
|
and (not self.normalized or name.replace('.', '_') == self.normalized)
|
|
# legacy case:
|
|
or self.is_egg(base)
|
|
and low == 'egg-info'
|
|
)
|
|
|
|
def is_egg(self, base):
|
|
return (
|
|
base == self.versionless_egg_name
|
|
or base.startswith(self.egg_prefix)
|
|
and base.endswith('.egg')
|
|
)
|
|
|
|
|
|
class MetadataPathFinder(DistributionFinder):
|
|
@classmethod
|
|
def find_distributions(cls, context=DistributionFinder.Context()):
|
|
"""
|
|
Find distributions.
|
|
|
|
Return an iterable of all Distribution instances capable of
|
|
loading the metadata for packages matching ``context.name``
|
|
(or all names if ``None`` indicated) along the paths in the list
|
|
of directories ``context.path``.
|
|
"""
|
|
found = cls._search_paths(context.name, context.path)
|
|
return map(PathDistribution, found)
|
|
|
|
@classmethod
|
|
def _search_paths(cls, name, paths):
|
|
"""Find metadata directories in paths heuristically."""
|
|
prepared = Prepared(name)
|
|
return itertools.chain.from_iterable(
|
|
path.search(prepared) for path in map(FastPath, paths)
|
|
)
|
|
|
|
|
|
class PathDistribution(Distribution):
|
|
def __init__(self, path):
|
|
"""Construct a distribution from a path to the metadata directory.
|
|
|
|
:param path: A pathlib.Path or similar object supporting
|
|
.joinpath(), __div__, .parent, and .read_text().
|
|
"""
|
|
self._path = path
|
|
|
|
def read_text(self, filename):
|
|
with suppress(
|
|
FileNotFoundError,
|
|
IsADirectoryError,
|
|
KeyError,
|
|
NotADirectoryError,
|
|
PermissionError,
|
|
):
|
|
return self._path.joinpath(filename).read_text(encoding='utf-8')
|
|
|
|
read_text.__doc__ = Distribution.read_text.__doc__
|
|
|
|
def locate_file(self, path):
|
|
return self._path.parent / path
|
|
|
|
|
|
def distribution(distribution_name):
|
|
"""Get the ``Distribution`` instance for the named package.
|
|
|
|
:param distribution_name: The name of the distribution package as a string.
|
|
:return: A ``Distribution`` instance (or subclass thereof).
|
|
"""
|
|
return Distribution.from_name(distribution_name)
|
|
|
|
|
|
def distributions(**kwargs):
|
|
"""Get all ``Distribution`` instances in the current environment.
|
|
|
|
:return: An iterable of ``Distribution`` instances.
|
|
"""
|
|
return Distribution.discover(**kwargs)
|
|
|
|
|
|
def metadata(distribution_name) -> PackageMetadata:
|
|
"""Get the metadata for the named package.
|
|
|
|
:param distribution_name: The name of the distribution package to query.
|
|
:return: A PackageMetadata containing the parsed metadata.
|
|
"""
|
|
return Distribution.from_name(distribution_name).metadata
|
|
|
|
|
|
def version(distribution_name):
|
|
"""Get the version string for the named package.
|
|
|
|
:param distribution_name: The name of the distribution package to query.
|
|
:return: The version string for the package as defined in the package's
|
|
"Version" metadata key.
|
|
"""
|
|
return distribution(distribution_name).version
|
|
|
|
|
|
def entry_points(**params) -> Union[EntryPoints, SelectableGroups]:
|
|
"""Return EntryPoint objects for all installed packages.
|
|
|
|
Pass selection parameters (group or name) to filter the
|
|
result to entry points matching those properties (see
|
|
EntryPoints.select()).
|
|
|
|
For compatibility, returns ``SelectableGroups`` object unless
|
|
selection parameters are supplied. In the future, this function
|
|
will return ``EntryPoints`` instead of ``SelectableGroups``
|
|
even when no selection parameters are supplied.
|
|
|
|
For maximum future compatibility, pass selection parameters
|
|
or invoke ``.select`` with parameters on the result.
|
|
|
|
:return: EntryPoints or SelectableGroups for all installed packages.
|
|
"""
|
|
unique = functools.partial(unique_everseen, key=operator.attrgetter('name'))
|
|
eps = itertools.chain.from_iterable(
|
|
dist.entry_points for dist in unique(distributions())
|
|
)
|
|
return SelectableGroups.load(eps).select(**params)
|
|
|
|
|
|
def files(distribution_name):
|
|
"""Return a list of files for the named package.
|
|
|
|
:param distribution_name: The name of the distribution package to query.
|
|
:return: List of files composing the distribution.
|
|
"""
|
|
return distribution(distribution_name).files
|
|
|
|
|
|
def requires(distribution_name):
|
|
"""
|
|
Return a list of requirements for the named package.
|
|
|
|
:return: An iterator of requirements, suitable for
|
|
packaging.requirement.Requirement.
|
|
"""
|
|
return distribution(distribution_name).requires
|
|
|
|
|
|
def packages_distributions() -> Mapping[str, List[str]]:
|
|
"""
|
|
Return a mapping of top-level packages to their
|
|
distributions.
|
|
|
|
>>> import collections.abc
|
|
>>> pkgs = packages_distributions()
|
|
>>> all(isinstance(dist, collections.abc.Sequence) for dist in pkgs.values())
|
|
True
|
|
"""
|
|
pkg_to_dist = collections.defaultdict(list)
|
|
for dist in distributions():
|
|
for pkg in (dist.read_text('top_level.txt') or '').split():
|
|
pkg_to_dist[pkg].append(dist.metadata['Name'])
|
|
return dict(pkg_to_dist)
|