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545 lines
20 KiB
Python
545 lines
20 KiB
Python
"""Classes representing releases and distributions retrieved from indexes.
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A project (= unique name) can have several releases (= versions) and
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each release can have several distributions (= sdist and bdists).
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Release objects contain metadata-related information (see PEP 376);
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distribution objects contain download-related information.
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"""
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import re
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import hashlib
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import tempfile
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import urllib.request
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import urllib.parse
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import urllib.error
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import urllib.parse
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from shutil import unpack_archive
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from packaging.errors import IrrationalVersionError
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from packaging.version import (suggest_normalized_version, NormalizedVersion,
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get_version_predicate)
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from packaging.metadata import Metadata
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from packaging.pypi.errors import (HashDoesNotMatch, UnsupportedHashName,
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CantParseArchiveName)
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__all__ = ['ReleaseInfo', 'DistInfo', 'ReleasesList', 'get_infos_from_url']
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EXTENSIONS = ".tar.gz .tar.bz2 .tar .zip .tgz .egg".split()
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MD5_HASH = re.compile(r'^.*#md5=([a-f0-9]+)$')
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DIST_TYPES = ['bdist', 'sdist']
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class IndexReference:
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"""Mixin used to store the index reference"""
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def set_index(self, index=None):
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self._index = index
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class ReleaseInfo(IndexReference):
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"""Represent a release of a project (a project with a specific version).
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The release contain the _metadata informations related to this specific
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version, and is also a container for distribution related informations.
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See the DistInfo class for more information about distributions.
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"""
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def __init__(self, name, version, metadata=None, hidden=False,
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index=None, **kwargs):
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"""
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:param name: the name of the distribution
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:param version: the version of the distribution
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:param metadata: the metadata fields of the release.
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:type metadata: dict
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:param kwargs: optional arguments for a new distribution.
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"""
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self.set_index(index)
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self.name = name
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self._version = None
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self.version = version
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if metadata:
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self.metadata = Metadata(mapping=metadata)
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else:
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self.metadata = None
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self.dists = {}
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self.hidden = hidden
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if 'dist_type' in kwargs:
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dist_type = kwargs.pop('dist_type')
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self.add_distribution(dist_type, **kwargs)
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def set_version(self, version):
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try:
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self._version = NormalizedVersion(version)
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except IrrationalVersionError:
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suggestion = suggest_normalized_version(version)
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if suggestion:
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self.version = suggestion
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else:
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raise IrrationalVersionError(version)
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def get_version(self):
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return self._version
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version = property(get_version, set_version)
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def fetch_metadata(self):
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"""If the metadata is not set, use the indexes to get it"""
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if not self.metadata:
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self._index.get_metadata(self.name, str(self.version))
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return self.metadata
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@property
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def is_final(self):
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"""proxy to version.is_final"""
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return self.version.is_final
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def fetch_distributions(self):
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if self.dists is None:
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self._index.get_distributions(self.name, str(self.version))
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if self.dists is None:
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self.dists = {}
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return self.dists
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def add_distribution(self, dist_type='sdist', python_version=None,
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**params):
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"""Add distribution informations to this release.
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If distribution information is already set for this distribution type,
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add the given url paths to the distribution. This can be useful while
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some of them fails to download.
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:param dist_type: the distribution type (eg. "sdist", "bdist", etc.)
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:param params: the fields to be passed to the distribution object
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(see the :class:DistInfo constructor).
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"""
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if dist_type not in DIST_TYPES:
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raise ValueError(dist_type)
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if dist_type in self.dists:
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self.dists[dist_type].add_url(**params)
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else:
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self.dists[dist_type] = DistInfo(self, dist_type,
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index=self._index, **params)
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if python_version:
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self.dists[dist_type].python_version = python_version
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def get_distribution(self, dist_type=None, prefer_source=True):
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"""Return a distribution.
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If dist_type is set, find first for this distribution type, and just
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act as an alias of __get_item__.
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If prefer_source is True, search first for source distribution, and if
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not return one existing distribution.
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"""
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if len(self.dists) == 0:
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raise LookupError
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if dist_type:
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return self[dist_type]
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if prefer_source:
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if "sdist" in self.dists:
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dist = self["sdist"]
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else:
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dist = next(self.dists.values())
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return dist
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def unpack(self, path=None, prefer_source=True):
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"""Unpack the distribution to the given path.
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If not destination is given, creates a temporary location.
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Returns the location of the extracted files (root).
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"""
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return self.get_distribution(prefer_source=prefer_source)\
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.unpack(path=path)
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def download(self, temp_path=None, prefer_source=True):
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"""Download the distribution, using the requirements.
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If more than one distribution match the requirements, use the last
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version.
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Download the distribution, and put it in the temp_path. If no temp_path
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is given, creates and return one.
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Returns the complete absolute path to the downloaded archive.
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"""
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return self.get_distribution(prefer_source=prefer_source)\
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.download(path=temp_path)
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def set_metadata(self, metadata):
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if not self.metadata:
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self.metadata = Metadata()
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self.metadata.update(metadata)
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def __getitem__(self, item):
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"""distributions are available using release["sdist"]"""
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return self.dists[item]
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def _check_is_comparable(self, other):
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if not isinstance(other, ReleaseInfo):
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raise TypeError("cannot compare %s and %s"
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% (type(self).__name__, type(other).__name__))
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elif self.name != other.name:
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raise TypeError("cannot compare %s and %s"
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% (self.name, other.name))
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def __repr__(self):
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return "<%s %s>" % (self.name, self.version)
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def __eq__(self, other):
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self._check_is_comparable(other)
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return self.version == other.version
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def __lt__(self, other):
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self._check_is_comparable(other)
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return self.version < other.version
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def __ne__(self, other):
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return not self.__eq__(other)
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def __gt__(self, other):
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return not (self.__lt__(other) or self.__eq__(other))
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def __le__(self, other):
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return self.__eq__(other) or self.__lt__(other)
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def __ge__(self, other):
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return self.__eq__(other) or self.__gt__(other)
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# See http://docs.python.org/reference/datamodel#object.__hash__
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__hash__ = object.__hash__
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class DistInfo(IndexReference):
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"""Represents a distribution retrieved from an index (sdist, bdist, ...)
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"""
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def __init__(self, release, dist_type=None, url=None, hashname=None,
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hashval=None, is_external=True, python_version=None,
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index=None):
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"""Create a new instance of DistInfo.
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:param release: a DistInfo class is relative to a release.
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:param dist_type: the type of the dist (eg. source, bin-*, etc.)
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:param url: URL where we found this distribution
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:param hashname: the name of the hash we want to use. Refer to the
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hashlib.new documentation for more information.
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:param hashval: the hash value.
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:param is_external: we need to know if the provided url comes from
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an index browsing, or from an external resource.
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"""
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self.set_index(index)
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self.release = release
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self.dist_type = dist_type
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self.python_version = python_version
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self._unpacked_dir = None
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# set the downloaded path to None by default. The goal here
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# is to not download distributions multiple times
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self.downloaded_location = None
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# We store urls in dict, because we need to have a bit more infos
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# than the simple URL. It will be used later to find the good url to
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# use.
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# We have two _url* attributes: _url and urls. urls contains a list
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# of dict for the different urls, and _url contains the choosen url, in
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# order to dont make the selection process multiple times.
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self.urls = []
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self._url = None
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self.add_url(url, hashname, hashval, is_external)
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def add_url(self, url=None, hashname=None, hashval=None, is_external=True):
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"""Add a new url to the list of urls"""
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if hashname is not None:
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try:
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hashlib.new(hashname)
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except ValueError:
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raise UnsupportedHashName(hashname)
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if url not in [u['url'] for u in self.urls]:
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self.urls.append({
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'url': url,
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'hashname': hashname,
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'hashval': hashval,
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'is_external': is_external,
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})
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# reset the url selection process
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self._url = None
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@property
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def url(self):
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"""Pick up the right url for the list of urls in self.urls"""
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# We return internal urls over externals.
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# If there is more than one internal or external, return the first
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# one.
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if self._url is None:
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if len(self.urls) > 1:
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internals_urls = [u for u in self.urls \
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if u['is_external'] == False]
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if len(internals_urls) >= 1:
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self._url = internals_urls[0]
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if self._url is None:
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self._url = self.urls[0]
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return self._url
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@property
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def is_source(self):
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"""return if the distribution is a source one or not"""
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return self.dist_type == 'sdist'
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def download(self, path=None):
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"""Download the distribution to a path, and return it.
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If the path is given in path, use this, otherwise, generates a new one
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Return the download location.
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"""
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if path is None:
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path = tempfile.mkdtemp()
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# if we do not have downloaded it yet, do it.
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if self.downloaded_location is None:
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url = self.url['url']
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archive_name = urllib.parse.urlparse(url)[2].split('/')[-1]
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filename, headers = urllib.request.urlretrieve(url,
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path + "/" + archive_name)
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self.downloaded_location = filename
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self._check_md5(filename)
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return self.downloaded_location
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def unpack(self, path=None):
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"""Unpack the distribution to the given path.
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If not destination is given, creates a temporary location.
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Returns the location of the extracted files (root).
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"""
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if not self._unpacked_dir:
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if path is None:
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path = tempfile.mkdtemp()
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filename = self.download(path)
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unpack_archive(filename, path)
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self._unpacked_dir = path
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return path
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def _check_md5(self, filename):
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"""Check that the md5 checksum of the given file matches the one in
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url param"""
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hashname = self.url['hashname']
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expected_hashval = self.url['hashval']
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if None not in (expected_hashval, hashname):
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with open(filename, 'rb') as f:
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hashval = hashlib.new(hashname)
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hashval.update(f.read())
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if hashval.hexdigest() != expected_hashval:
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raise HashDoesNotMatch("got %s instead of %s"
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% (hashval.hexdigest(), expected_hashval))
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def __repr__(self):
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if self.release is None:
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return "<? ? %s>" % self.dist_type
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return "<%s %s %s>" % (
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self.release.name, self.release.version, self.dist_type or "")
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class ReleasesList(IndexReference):
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"""A container of Release.
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Provides useful methods and facilities to sort and filter releases.
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"""
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def __init__(self, name, releases=None, contains_hidden=False, index=None):
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self.set_index(index)
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self.releases = []
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self.name = name
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self.contains_hidden = contains_hidden
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if releases:
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self.add_releases(releases)
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def fetch_releases(self):
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self._index.get_releases(self.name)
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return self.releases
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def filter(self, predicate):
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"""Filter and return a subset of releases matching the given predicate.
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"""
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return ReleasesList(self.name, [release for release in self.releases
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if predicate.match(release.version)],
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index=self._index)
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def get_last(self, requirements, prefer_final=None):
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"""Return the "last" release, that satisfy the given predicates.
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"last" is defined by the version number of the releases, you also could
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set prefer_final parameter to True or False to change the order results
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"""
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predicate = get_version_predicate(requirements)
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releases = self.filter(predicate)
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if len(releases) == 0:
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return None
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releases.sort_releases(prefer_final, reverse=True)
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return releases[0]
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def add_releases(self, releases):
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"""Add releases in the release list.
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:param: releases is a list of ReleaseInfo objects.
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"""
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for r in releases:
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self.add_release(release=r)
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def add_release(self, version=None, dist_type='sdist', release=None,
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**dist_args):
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"""Add a release to the list.
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The release can be passed in the `release` parameter, and in this case,
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it will be crawled to extract the useful informations if necessary, or
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the release informations can be directly passed in the `version` and
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`dist_type` arguments.
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Other keywords arguments can be provided, and will be forwarded to the
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distribution creation (eg. the arguments of the DistInfo constructor).
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"""
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if release:
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if release.name.lower() != self.name.lower():
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raise ValueError("%s is not the same project as %s" %
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(release.name, self.name))
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version = str(release.version)
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if version not in self.get_versions():
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# append only if not already exists
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self.releases.append(release)
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for dist in release.dists.values():
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for url in dist.urls:
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self.add_release(version, dist.dist_type, **url)
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else:
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matches = [r for r in self.releases
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if str(r.version) == version and r.name == self.name]
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if not matches:
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release = ReleaseInfo(self.name, version, index=self._index)
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self.releases.append(release)
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else:
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release = matches[0]
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release.add_distribution(dist_type=dist_type, **dist_args)
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def sort_releases(self, prefer_final=False, reverse=True, *args, **kwargs):
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"""Sort the results with the given properties.
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The `prefer_final` argument can be used to specify if final
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distributions (eg. not dev, beta or alpha) would be preferred or not.
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Results can be inverted by using `reverse`.
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Any other parameter provided will be forwarded to the sorted call. You
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cannot redefine the key argument of "sorted" here, as it is used
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internally to sort the releases.
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"""
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sort_by = []
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if prefer_final:
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sort_by.append("is_final")
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sort_by.append("version")
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self.releases.sort(
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key=lambda i: tuple(getattr(i, arg) for arg in sort_by),
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reverse=reverse, *args, **kwargs)
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def get_release(self, version):
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"""Return a release from its version."""
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matches = [r for r in self.releases if str(r.version) == version]
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if len(matches) != 1:
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raise KeyError(version)
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return matches[0]
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def get_versions(self):
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"""Return a list of releases versions contained"""
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return [str(r.version) for r in self.releases]
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def __getitem__(self, key):
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return self.releases[key]
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def __len__(self):
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return len(self.releases)
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def __repr__(self):
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string = 'Project "%s"' % self.name
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if self.get_versions():
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string += ' versions: %s' % ', '.join(self.get_versions())
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return '<%s>' % string
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def get_infos_from_url(url, probable_dist_name=None, is_external=True):
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"""Get useful informations from an URL.
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Return a dict of (name, version, url, hashtype, hash, is_external)
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:param url: complete url of the distribution
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:param probable_dist_name: A probable name of the project.
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:param is_external: Tell if the url commes from an index or from
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an external URL.
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"""
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# if the url contains a md5 hash, get it.
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md5_hash = None
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match = MD5_HASH.match(url)
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if match is not None:
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md5_hash = match.group(1)
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# remove the hash
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url = url.replace("#md5=%s" % md5_hash, "")
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# parse the archive name to find dist name and version
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archive_name = urllib.parse.urlparse(url)[2].split('/')[-1]
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extension_matched = False
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# remove the extension from the name
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for ext in EXTENSIONS:
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if archive_name.endswith(ext):
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archive_name = archive_name[:-len(ext)]
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extension_matched = True
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name, version = split_archive_name(archive_name)
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if extension_matched is True:
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return {'name': name,
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'version': version,
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'url': url,
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'hashname': "md5",
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'hashval': md5_hash,
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'is_external': is_external,
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'dist_type': 'sdist'}
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def split_archive_name(archive_name, probable_name=None):
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"""Split an archive name into two parts: name and version.
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Return the tuple (name, version)
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"""
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# Try to determine wich part is the name and wich is the version using the
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# "-" separator. Take the larger part to be the version number then reduce
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# if this not works.
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def eager_split(str, maxsplit=2):
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# split using the "-" separator
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splits = str.rsplit("-", maxsplit)
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name = splits[0]
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version = "-".join(splits[1:])
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if version.startswith("-"):
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version = version[1:]
|
|
if suggest_normalized_version(version) is None and maxsplit >= 0:
|
|
# we dont get a good version number: recurse !
|
|
return eager_split(str, maxsplit - 1)
|
|
else:
|
|
return name, version
|
|
if probable_name is not None:
|
|
probable_name = probable_name.lower()
|
|
name = None
|
|
if probable_name is not None and probable_name in archive_name:
|
|
# we get the name from probable_name, if given.
|
|
name = probable_name
|
|
version = archive_name.lstrip(name)
|
|
else:
|
|
name, version = eager_split(archive_name)
|
|
|
|
version = suggest_normalized_version(version)
|
|
if version is not None and name != "":
|
|
return name.lower(), version
|
|
else:
|
|
raise CantParseArchiveName(archive_name)
|