JezK
Edit File: metadata.py
import io import os import re import abc import csv import sys import email import pathlib import zipfile import operator import functools import itertools import posixpath import collections from configparser import ConfigParser from contextlib import suppress from importlib import import_module from importlib.abc import MetaPathFinder from itertools import starmap __all__ = [ 'Distribution', 'DistributionFinder', 'PackageNotFoundError', 'distribution', 'distributions', 'entry_points', 'files', 'metadata', 'requires', 'version', ] class PackageNotFoundError(ModuleNotFoundError): """The package was not found.""" class EntryPoint( collections.namedtuple('EntryPointBase', 'name value group')): """An entry point as defined by Python packaging conventions. See `the packaging docs on entry points <https://packaging.python.org/specifications/entry-points/>`_ for more information. >>> ep = EntryPoint( ... name=None, group=None, value='package.module:attr [extra1, extra2]') >>> ep.module 'package.module' >>> ep.attr 'attr' >>> ep.extras ['extra1', 'extra2'] """ pattern = re.compile( r'(?P<module>[\w.]+)\s*' r'(:\s*(?P<attr>[\w.]+)\s*)?' r'((?P<extras>\[.*\])\s*)?$' ) """ A regular expression describing the syntax for an entry point, which might look like: - module - package.module - package.module:attribute - package.module:object.attribute - package.module:attr [extra1, extra2] Other combinations are possible as well. The expression is lenient about whitespace around the ':', following the attr, and following any extras. """ def load(self): """Load the entry point from its definition. If only a module is indicated by the value, return that module. Otherwise, return the named object. """ match = self.pattern.match(self.value) module = import_module(match.group('module')) attrs = filter(None, (match.group('attr') or '').split('.')) return functools.reduce(getattr, attrs, module) @property def module(self): match = self.pattern.match(self.value) return match.group('module') @property def attr(self): match = self.pattern.match(self.value) return match.group('attr') @property def extras(self): match = self.pattern.match(self.value) return re.findall(r'\w+', match.group('extras') or '') @classmethod def _from_config(cls, config): return [ cls(name, value, group) for group in config.sections() for name, value in config.items(group) ] @classmethod def _from_text(cls, text): config = ConfigParser(delimiters='=') # case sensitive: https://stackoverflow.com/q/1611799/812183 config.optionxform = str try: config.read_string(text) except AttributeError: # pragma: nocover # Python 2 has no read_string config.readfp(io.StringIO(text)) return EntryPoint._from_config(config) def __iter__(self): """ Supply iter so one may construct dicts of EntryPoints easily. """ return iter((self.name, self)) def __reduce__(self): return ( self.__class__, (self.name, self.value, self.group), ) class PackagePath(pathlib.PurePosixPath): """A reference to a path in a package""" def read_text(self, encoding='utf-8'): with self.locate().open(encoding=encoding) as stream: return stream.read() def read_binary(self): with self.locate().open('rb') as stream: return stream.read() def locate(self): """Return a path-like object for this path""" return self.dist.locate_file(self) class FileHash: def __init__(self, spec): self.mode, _, self.value = spec.partition('=') def __repr__(self): return '<FileHash mode: {} value: {}>'.format(self.mode, self.value) class Distribution: """A Python distribution package.""" @abc.abstractmethod def read_text(self, filename): """Attempt to load metadata file given by the name. :param filename: The name of the file in the distribution info. :return: The text if found, otherwise None. """ @abc.abstractmethod def locate_file(self, path): """ Given a path to a file in this distribution, return a path to it. """ @classmethod def from_name(cls, name): """Return the Distribution for the given package name. :param name: The name of the distribution package to search for. :return: The Distribution instance (or subclass thereof) for the named package, if found. :raises PackageNotFoundError: When the named package's distribution metadata cannot be found. """ for resolver in cls._discover_resolvers(): dists = resolver(DistributionFinder.Context(name=name)) dist = next(iter(dists), None) if dist is not None: return dist else: raise PackageNotFoundError(name) @classmethod def discover(cls, **kwargs): """Return an iterable of Distribution objects for all packages. Pass a ``context`` or pass keyword arguments for constructing a context. :context: A ``DistributionFinder.Context`` object. :return: Iterable of Distribution objects for all packages. """ context = kwargs.pop('context', None) if context and kwargs: raise ValueError("cannot accept context and kwargs") context = context or DistributionFinder.Context(**kwargs) return itertools.chain.from_iterable( resolver(context) for resolver in cls._discover_resolvers() ) @staticmethod def at(path): """Return a Distribution for the indicated metadata path :param path: a string or path-like object :return: a concrete Distribution instance for the path """ return PathDistribution(pathlib.Path(path)) @staticmethod def _discover_resolvers(): """Search the meta_path for resolvers.""" declared = ( getattr(finder, 'find_distributions', None) for finder in sys.meta_path ) return filter(None, declared) @classmethod def _local(cls, root='.'): from pep517 import build, meta system = build.compat_system(root) builder = functools.partial( meta.build, source_dir=root, system=system, ) return PathDistribution(zipfile.Path(meta.build_as_zip(builder))) @property def metadata(self): """Return the parsed metadata for this Distribution. The returned object will have keys that name the various bits of metadata. See PEP 566 for details. """ text = ( self.read_text('METADATA') or self.read_text('PKG-INFO') # This last clause is here to support old egg-info files. Its # effect is to just end up using the PathDistribution's self._path # (which points to the egg-info file) attribute unchanged. or self.read_text('') ) return email.message_from_string(text) @property def version(self): """Return the 'Version' metadata for the distribution package.""" return self.metadata['Version'] @property def entry_points(self): return EntryPoint._from_text(self.read_text('entry_points.txt')) @property def files(self): """Files in this distribution. :return: List of PackagePath for this distribution or None Result is `None` if the metadata file that enumerates files (i.e. RECORD for dist-info or SOURCES.txt for egg-info) is missing. Result may be empty if the metadata exists but is empty. """ file_lines = self._read_files_distinfo() or self._read_files_egginfo() def make_file(name, hash=None, size_str=None): result = PackagePath(name) result.hash = FileHash(hash) if hash else None result.size = int(size_str) if size_str else None result.dist = self return result return file_lines and list(starmap(make_file, csv.reader(file_lines))) def _read_files_distinfo(self): """ Read the lines of RECORD """ text = self.read_text('RECORD') return text and text.splitlines() def _read_files_egginfo(self): """ SOURCES.txt might contain literal commas, so wrap each line in quotes. """ text = self.read_text('SOURCES.txt') return text and map('"{}"'.format, text.splitlines()) @property def requires(self): """Generated requirements specified for this Distribution""" reqs = self._read_dist_info_reqs() or self._read_egg_info_reqs() return reqs and list(reqs) def _read_dist_info_reqs(self): return self.metadata.get_all('Requires-Dist') def _read_egg_info_reqs(self): source = self.read_text('requires.txt') return None if source is None else self._deps_from_requires_text(source) @classmethod def _deps_from_requires_text(cls, source): section_pairs = cls._read_sections(source.splitlines()) sections = { section: list(map(operator.itemgetter('line'), results)) for section, results in itertools.groupby(section_pairs, operator.itemgetter('section')) } return cls._convert_egg_info_reqs_to_simple_reqs(sections) @staticmethod def _read_sections(lines): section = None for line in filter(None, lines): section_match = re.match(r'\[(.*)\]$', line) if section_match: section = section_match.group(1) continue yield locals() @staticmethod def _convert_egg_info_reqs_to_simple_reqs(sections): """ Historically, setuptools would solicit and store 'extra' requirements, including those with environment markers, in separate sections. More modern tools expect each dependency to be defined separately, with any relevant extras and environment markers attached directly to that requirement. This method converts the former to the latter. See _test_deps_from_requires_text for an example. """ def make_condition(name): return name and 'extra == "{name}"'.format(name=name) def quoted_marker(section): section = section or '' extra, sep, markers = section.partition(':') if extra and markers: markers = f'({markers})' conditions = list(filter(None, [markers, make_condition(extra)])) return '; ' + ' and '.join(conditions) if conditions else '' def url_req_space(req): """ PEP 508 requires a space between the url_spec and the quoted_marker. Ref python/importlib_metadata#357. """ # '@' is uniquely indicative of a url_req. return ' ' * ('@' in req) for section, deps in sections.items(): for dep in deps: space = url_req_space(dep) yield dep + space + quoted_marker(section) class DistributionFinder(MetaPathFinder): """ A MetaPathFinder capable of discovering installed distributions. """ class Context: """ Keyword arguments presented by the caller to ``distributions()`` or ``Distribution.discover()`` to narrow the scope of a search for distributions in all DistributionFinders. Each DistributionFinder may expect any parameters and should attempt to honor the canonical parameters defined below when appropriate. """ name = None """ Specific name for which a distribution finder should match. A name of ``None`` matches all distributions. """ def __init__(self, **kwargs): vars(self).update(kwargs) @property def path(self): """ 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 is_egg(self, search): base = self.base return ( base == search.versionless_egg_name or base.startswith(search.prefix) and base.endswith('.egg')) def search(self, name): for child in self.children(): n_low = child.lower() if (n_low in name.exact_matches or n_low.startswith(name.prefix) and n_low.endswith(name.suffixes) # legacy case: or self.is_egg(name) and n_low == 'egg-info'): yield self.joinpath(child) class Prepared: """ A prepared search for metadata on a possibly-named package. """ normalized = '' prefix = '' suffixes = '.dist-info', '.egg-info' exact_matches = [''][:0] versionless_egg_name = '' def __init__(self, name): self.name = name if name is None: return self.normalized = name.lower().replace('-', '_') self.prefix = self.normalized + '-' self.exact_matches = [ self.normalized + suffix for suffix in self.suffixes] self.versionless_egg_name = self.normalized + '.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.""" return itertools.chain.from_iterable( path.search(Prepared(name)) 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): """Get the metadata for the named package. :param distribution_name: The name of the distribution package to query. :return: An email.Message 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(): """Return EntryPoint objects for all installed packages. :return: EntryPoint objects for all installed packages. """ eps = itertools.chain.from_iterable( dist.entry_points for dist in distributions()) by_group = operator.attrgetter('group') ordered = sorted(eps, key=by_group) grouped = itertools.groupby(ordered, by_group) return { group: tuple(eps) for group, eps in grouped } 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