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collector.py��0000644��00000037611�15030224355�0007113 0��ustar�00��""" The main purpose of this module is to expose LinkCollector.collect_sources(). """ import collections import email.message import functools import itertools import json import logging import os import urllib.parse import urllib.request from dataclasses import dataclass from html.parser import HTMLParser from optparse import Values from typing import ( Callable, Dict, Iterable, List, MutableMapping, NamedTuple, Optional, Protocol, Sequence, Tuple, Union, ) from pip._vendor import requests from pip._vendor.requests import Response from pip._vendor.requests.exceptions import RetryError, SSLError from pip._internal.exceptions import NetworkConnectionError from pip._internal.models.link import Link from pip._internal.models.search_scope import SearchScope from pip._internal.network.session import PipSession from pip._internal.network.utils import raise_for_status from pip._internal.utils.filetypes import is_archive_file from pip._internal.utils.misc import redact_auth_from_url from pip._internal.vcs import vcs from .sources import CandidatesFromPage, LinkSource, build_source logger = logging.getLogger(__name__) ResponseHeaders = MutableMapping[str, str] def _match_vcs_scheme(url: str) -> Optional[str]: """Look for VCS schemes in the URL. Returns the matched VCS scheme, or None if there's no match. """ for scheme in vcs.schemes: if url.lower().startswith(scheme) and url[len(scheme)] in "+:": return scheme return None class _NotAPIContent(Exception): def __init__(self, content_type: str, request_desc: str) -> None: super().__init__(content_type, request_desc) self.content_type = content_type self.request_desc = request_desc def _ensure_api_header(response: Response) -> None: """ Check the Content-Type header to ensure the response contains a Simple API Response. Raises `_NotAPIContent` if the content type is not a valid content-type. """ content_type = response.headers.get("Content-Type", "Unknown") content_type_l = content_type.lower() if content_type_l.startswith( ( "text/html", "application/vnd.pypi.simple.v1+html", "application/vnd.pypi.simple.v1+json", ) ): return raise _NotAPIContent(content_type, response.request.method) class _NotHTTP(Exception): pass def _ensure_api_response(url: str, session: PipSession) -> None: """ Send a HEAD request to the URL, and ensure the response contains a simple API Response. Raises `_NotHTTP` if the URL is not available for a HEAD request, or `_NotAPIContent` if the content type is not a valid content type. """ scheme, netloc, path, query, fragment = urllib.parse.urlsplit(url) if scheme not in {"http", "https"}: raise _NotHTTP() resp = session.head(url, allow_redirects=True) raise_for_status(resp) _ensure_api_header(resp) def _get_simple_response(url: str, session: PipSession) -> Response: """Access an Simple API response with GET, and return the response. This consists of three parts: 1. If the URL looks suspiciously like an archive, send a HEAD first to check the Content-Type is HTML or Simple API, to avoid downloading a large file. Raise `_NotHTTP` if the content type cannot be determined, or `_NotAPIContent` if it is not HTML or a Simple API. 2. Actually perform the request. Raise HTTP exceptions on network failures. 3. Check the Content-Type header to make sure we got a Simple API response, and raise `_NotAPIContent` otherwise. """ if is_archive_file(Link(url).filename): _ensure_api_response(url, session=session) logger.debug("Getting page %s", redact_auth_from_url(url)) resp = session.get( url, headers={ "Accept": ", ".join( [ "application/vnd.pypi.simple.v1+json", "application/vnd.pypi.simple.v1+html; q=0.1", "text/html; q=0.01", ] ), # We don't want to blindly returned cached data for # /simple/, because authors generally expecting that # twine upload && pip install will function, but if # they've done a pip install in the last ~10 minutes # it won't. Thus by setting this to zero we will not # blindly use any cached data, however the benefit of # using max-age=0 instead of no-cache, is that we will # still support conditional requests, so we will still # minimize traffic sent in cases where the page hasn't # changed at all, we will just always incur the round # trip for the conditional GET now instead of only # once per 10 minutes. # For more information, please see pypa/pip#5670. "Cache-Control": "max-age=0", }, ) raise_for_status(resp) # The check for archives above only works if the url ends with # something that looks like an archive. However that is not a # requirement of an url. Unless we issue a HEAD request on every # url we cannot know ahead of time for sure if something is a # Simple API response or not. However we can check after we've # downloaded it. _ensure_api_header(resp) logger.debug( "Fetched page %s as %s", redact_auth_from_url(url), resp.headers.get("Content-Type", "Unknown"), ) return resp def _get_encoding_from_headers(headers: ResponseHeaders) -> Optional[str]: """Determine if we have any encoding information in our headers.""" if headers and "Content-Type" in headers: m = email.message.Message() m["content-type"] = headers["Content-Type"] charset = m.get_param("charset") if charset: return str(charset) return None class CacheablePageContent: def __init__(self, page: "IndexContent") -> None: assert page.cache_link_parsing self.page = page def __eq__(self, other: object) -> bool: return isinstance(other, type(self)) and self.page.url == other.page.url def __hash__(self) -> int: return hash(self.page.url) class ParseLinks(Protocol): def __call__(self, page: "IndexContent") -> Iterable[Link]: ... def with_cached_index_content(fn: ParseLinks) -> ParseLinks: """ Given a function that parses an Iterable[Link] from an IndexContent, cache the function's result (keyed by CacheablePageContent), unless the IndexContent `page` has `page.cache_link_parsing == False`. """ @functools.lru_cache(maxsize=None) def wrapper(cacheable_page: CacheablePageContent) -> List[Link]: return list(fn(cacheable_page.page)) @functools.wraps(fn) def wrapper_wrapper(page: "IndexContent") -> List[Link]: if page.cache_link_parsing: return wrapper(CacheablePageContent(page)) return list(fn(page)) return wrapper_wrapper @with_cached_index_content def parse_links(page: "IndexContent") -> Iterable[Link]: """ Parse a Simple API's Index Content, and yield its anchor elements as Link objects. """ content_type_l = page.content_type.lower() if content_type_l.startswith("application/vnd.pypi.simple.v1+json"): data = json.loads(page.content) for file in data.get("files", []): link = Link.from_json(file, page.url) if link is None: continue yield link return parser = HTMLLinkParser(page.url) encoding = page.encoding or "utf-8" parser.feed(page.content.decode(encoding)) url = page.url base_url = parser.base_url or url for anchor in parser.anchors: link = Link.from_element(anchor, page_url=url, base_url=base_url) if link is None: continue yield link @dataclass(frozen=True) class IndexContent: """Represents one response (or page), along with its URL. :param encoding: the encoding to decode the given content. :param url: the URL from which the HTML was downloaded. :param cache_link_parsing: whether links parsed from this page's url should be cached. PyPI index urls should have this set to False, for example. """ content: bytes content_type: str encoding: Optional[str] url: str cache_link_parsing: bool = True def __str__(self) -> str: return redact_auth_from_url(self.url) class HTMLLinkParser(HTMLParser): """ HTMLParser that keeps the first base HREF and a list of all anchor elements' attributes. """ def __init__(self, url: str) -> None: super().__init__(convert_charrefs=True) self.url: str = url self.base_url: Optional[str] = None self.anchors: List[Dict[str, Optional[str]]] = [] def handle_starttag(self, tag: str, attrs: List[Tuple[str, Optional[str]]]) -> None: if tag == "base" and self.base_url is None: href = self.get_href(attrs) if href is not None: self.base_url = href elif tag == "a": self.anchors.append(dict(attrs)) def get_href(self, attrs: List[Tuple[str, Optional[str]]]) -> Optional[str]: for name, value in attrs: if name == "href": return value return None def _handle_get_simple_fail( link: Link, reason: Union[str, Exception], meth: Optional[Callable[..., None]] = None, ) -> None: if meth is None: meth = logger.debug meth("Could not fetch URL %s: %s - skipping", link, reason) def _make_index_content( response: Response, cache_link_parsing: bool = True ) -> IndexContent: encoding = _get_encoding_from_headers(response.headers) return IndexContent( response.content, response.headers["Content-Type"], encoding=encoding, url=response.url, cache_link_parsing=cache_link_parsing, ) def _get_index_content(link: Link, , session: PipSession) -> Optional["IndexContent"]: url = link.url.split("#", 1)[0] # Check for VCS schemes that do not support lookup as web pages. vcs_scheme = _match_vcs_scheme(url) if vcs_scheme: logger.warning( "Cannot look at %s URL %s because it does not support lookup as web pages.", vcs_scheme, link, ) return None # Tack index.html onto file:// URLs that point to directories scheme, _, path, _, _, _ = urllib.parse.urlparse(url) if scheme == "file" and os.path.isdir(urllib.request.url2pathname(path)): # add trailing slash if not present so urljoin doesn't trim # final segment if not url.endswith("/"): url += "/" # TODO: In the future, it would be nice if pip supported PEP 691 # style responses in the file:// URLs, however there's no # standard file extension for application/vnd.pypi.simple.v1+json # so we'll need to come up with something on our own. url = urllib.parse.urljoin(url, "index.html") logger.debug(" file: URL is directory, getting %s", url) try: resp = _get_simple_response(url, session=session) except _NotHTTP: logger.warning( "Skipping page %s because it looks like an archive, and cannot " "be checked by a HTTP HEAD request.", link, ) except _NotAPIContent as exc: logger.warning( "Skipping page %s because the %s request got Content-Type: %s. " "The only supported Content-Types are application/vnd.pypi.simple.v1+json, " "application/vnd.pypi.simple.v1+html, and text/html", link, exc.request_desc, exc.content_type, ) except NetworkConnectionError as exc: _handle_get_simple_fail(link, exc) except RetryError as exc: _handle_get_simple_fail(link, exc) except SSLError as exc: reason = "There was a problem confirming the ssl certificate: " reason += str(exc) _handle_get_simple_fail(link, reason, meth=logger.info) except requests.ConnectionError as exc: _handle_get_simple_fail(link, f"connection error: {exc}") except requests.Timeout: _handle_get_simple_fail(link, "timed out") else: return _make_index_content(resp, cache_link_parsing=link.cache_link_parsing) return None class CollectedSources(NamedTuple): find_links: Sequence[Optional[LinkSource]] index_urls: Sequence[Optional[LinkSource]] class LinkCollector: """ Responsible for collecting Link objects from all configured locations, making network requests as needed. The class's main method is its collect_sources() method. """ def __init__( self, session: PipSession, search_scope: SearchScope, ) -> None: self.search_scope = search_scope self.session = session @classmethod def create( cls, session: PipSession, options: Values, suppress_no_index: bool = False, ) -> "LinkCollector": """ :param session: The Session to use to make requests. :param suppress_no_index: Whether to ignore the --no-index option when constructing the SearchScope object. """ index_urls = [options.index_url] + options.extra_index_urls if options.no_index and not suppress_no_index: logger.debug( "Ignoring indexes: %s", ",".join(redact_auth_from_url(url) for url in index_urls), ) index_urls = [] # Make sure find_links is a list before passing to create(). find_links = options.find_links or [] search_scope = SearchScope.create( find_links=find_links, index_urls=index_urls, no_index=options.no_index, ) link_collector = LinkCollector( session=session, search_scope=search_scope, ) return link_collector @property def find_links(self) -> List[str]: return self.search_scope.find_links def fetch_response(self, location: Link) -> Optional[IndexContent]: """ Fetch an HTML page containing package links. """ return _get_index_content(location, session=self.session) def collect_sources( self, project_name: str, candidates_from_page: CandidatesFromPage, ) -> CollectedSources: # The OrderedDict calls deduplicate sources by URL. index_url_sources = collections.OrderedDict( build_source( loc, candidates_from_page=candidates_from_page, page_validator=self.session.is_secure_origin, expand_dir=False, cache_link_parsing=False, project_name=project_name, ) for loc in self.search_scope.get_index_urls_locations(project_name) ).values() find_links_sources = collections.OrderedDict( build_source( loc, candidates_from_page=candidates_from_page, page_validator=self.session.is_secure_origin, expand_dir=True, cache_link_parsing=True, project_name=project_name, ) for loc in self.find_links ).values() if logger.isEnabledFor(logging.DEBUG): lines = [ f" {s.link}" for s in itertools.chain(find_links_sources, index_url_sources) if s is not None and s.link is not None ] lines = [ f"{len(lines)} location(s) to search " f"for versions of {project_name}:" ] + lines logger.debug("\n".join(lines)) return CollectedSources( find_links=list(find_links_sources), index_urls=list(index_url_sources), ) ��package_finder.py��0000644��00000112274�15030224355�0010046 0��ustar�00��"""Routines related to PyPI, indexes""" import enum import functools import itertools import logging import re from dataclasses import dataclass from typing import TYPE_CHECKING, FrozenSet, Iterable, List, Optional, Set, Tuple, Union from pip._vendor.packaging import specifiers from pip._vendor.packaging.tags import Tag from pip._vendor.packaging.utils import canonicalize_name from pip._vendor.packaging.version import InvalidVersion, _BaseVersion from pip._vendor.packaging.version import parse as parse_version from pip._internal.exceptions import ( BestVersionAlreadyInstalled, DistributionNotFound, InvalidWheelFilename, UnsupportedWheel, ) from pip._internal.index.collector import LinkCollector, parse_links from pip._internal.models.candidate import InstallationCandidate from pip._internal.models.format_control import FormatControl from pip._internal.models.link import Link from pip._internal.models.search_scope import SearchScope from pip._internal.models.selection_prefs import SelectionPreferences from pip._internal.models.target_python import TargetPython from pip._internal.models.wheel import Wheel from pip._internal.req import InstallRequirement from pip._internal.utils._log import getLogger from pip._internal.utils.filetypes import WHEEL_EXTENSION from pip._internal.utils.hashes import Hashes from pip._internal.utils.logging import indent_log from pip._internal.utils.misc import build_netloc from pip._internal.utils.packaging import check_requires_python from pip._internal.utils.unpacking import SUPPORTED_EXTENSIONS if TYPE_CHECKING: from pip._vendor.typing_extensions import TypeGuard __all__ = ["FormatControl", "BestCandidateResult", "PackageFinder"] logger = getLogger(__name__) BuildTag = Union[Tuple[()], Tuple[int, str]] CandidateSortingKey = Tuple[int, int, int, _BaseVersion, Optional[int], BuildTag] def _check_link_requires_python( link: Link, version_info: Tuple[int, int, int], ignore_requires_python: bool = False, ) -> bool: """ Return whether the given Python version is compatible with a link's "Requires-Python" value. :param version_info: A 3-tuple of ints representing the Python major-minor-micro version to check. :param ignore_requires_python: Whether to ignore the "Requires-Python" value if the given Python version isn't compatible. """ try: is_compatible = check_requires_python( link.requires_python, version_info=version_info, ) except specifiers.InvalidSpecifier: logger.debug( "Ignoring invalid Requires-Python (%r) for link: %s", link.requires_python, link, ) else: if not is_compatible: version = ".".join(map(str, version_info)) if not ignore_requires_python: logger.verbose( "Link requires a different Python (%s not in: %r): %s", version, link.requires_python, link, ) return False logger.debug( "Ignoring failed Requires-Python check (%s not in: %r) for link: %s", version, link.requires_python, link, ) return True class LinkType(enum.Enum): candidate = enum.auto() different_project = enum.auto() yanked = enum.auto() format_unsupported = enum.auto() format_invalid = enum.auto() platform_mismatch = enum.auto() requires_python_mismatch = enum.auto() class LinkEvaluator: """ Responsible for evaluating links for a particular project. """ _py_version_re = re.compile(r"-py([123]\.?[0-9]?)$") # Don't include an allow_yanked default value to make sure each call # site considers whether yanked releases are allowed. This also causes # that decision to be made explicit in the calling code, which helps # people when reading the code. def __init__( self, project_name: str, canonical_name: str, formats: FrozenSet[str], target_python: TargetPython, allow_yanked: bool, ignore_requires_python: Optional[bool] = None, ) -> None: """ :param project_name: The user supplied package name. :param canonical_name: The canonical package name. :param formats: The formats allowed for this package. Should be a set with 'binary' or 'source' or both in it. :param target_python: The target Python interpreter to use when evaluating link compatibility. This is used, for example, to check wheel compatibility, as well as when checking the Python version, e.g. the Python version embedded in a link filename (or egg fragment) and against an HTML link's optional PEP 503 "data-requires-python" attribute. :param allow_yanked: Whether files marked as yanked (in the sense of PEP 592) are permitted to be candidates for install. :param ignore_requires_python: Whether to ignore incompatible PEP 503 "data-requires-python" values in HTML links. Defaults to False. """ if ignore_requires_python is None: ignore_requires_python = False self._allow_yanked = allow_yanked self._canonical_name = canonical_name self._ignore_requires_python = ignore_requires_python self._formats = formats self._target_python = target_python self.project_name = project_name def evaluate_link(self, link: Link) -> Tuple[LinkType, str]: """ Determine whether a link is a candidate for installation. :return: A tuple (result, detail), where result is an enum representing whether the evaluation found a candidate, or the reason why one is not found. If a candidate is found, detail will be the candidate's version string; if one is not found, it contains the reason the link fails to qualify. """ version = None if link.is_yanked and not self._allow_yanked: reason = link.yanked_reason or "<none given>" return (LinkType.yanked, f"yanked for reason: {reason}") if link.egg_fragment: egg_info = link.egg_fragment ext = link.ext else: egg_info, ext = link.splitext() if not ext: return (LinkType.format_unsupported, "not a file") if ext not in SUPPORTED_EXTENSIONS: return ( LinkType.format_unsupported, f"unsupported archive format: {ext}", ) if "binary" not in self._formats and ext == WHEEL_EXTENSION: reason = f"No binaries permitted for {self.project_name}" return (LinkType.format_unsupported, reason) if "macosx10" in link.path and ext == ".zip": return (LinkType.format_unsupported, "macosx10 one") if ext == WHEEL_EXTENSION: try: wheel = Wheel(link.filename) except InvalidWheelFilename: return ( LinkType.format_invalid, "invalid wheel filename", ) if canonicalize_name(wheel.name) != self._canonical_name: reason = f"wrong project name (not {self.project_name})" return (LinkType.different_project, reason) supported_tags = self._target_python.get_unsorted_tags() if not wheel.supported(supported_tags): # Include the wheel's tags in the reason string to # simplify troubleshooting compatibility issues. file_tags = ", ".join(wheel.get_formatted_file_tags()) reason = ( f"none of the wheel's tags ({file_tags}) are compatible " f"(run pip debug --verbose to show compatible tags)" ) return (LinkType.platform_mismatch, reason) version = wheel.version # This should be up by the self.ok_binary check, but see issue 2700. if "source" not in self._formats and ext != WHEEL_EXTENSION: reason = f"No sources permitted for {self.project_name}" return (LinkType.format_unsupported, reason) if not version: version = _extract_version_from_fragment( egg_info, self._canonical_name, ) if not version: reason = f"Missing project version for {self.project_name}" return (LinkType.format_invalid, reason) match = self._py_version_re.search(version) if match: version = version[: match.start()] py_version = match.group(1) if py_version != self._target_python.py_version: return ( LinkType.platform_mismatch, "Python version is incorrect", ) supports_python = _check_link_requires_python( link, version_info=self._target_python.py_version_info, ignore_requires_python=self._ignore_requires_python, ) if not supports_python: reason = f"{version} Requires-Python {link.requires_python}" return (LinkType.requires_python_mismatch, reason) logger.debug("Found link %s, version: %s", link, version) return (LinkType.candidate, version) def filter_unallowed_hashes( candidates: List[InstallationCandidate], hashes: Optional[Hashes], project_name: str, ) -> List[InstallationCandidate]: """ Filter out candidates whose hashes aren't allowed, and return a new list of candidates. If at least one candidate has an allowed hash, then all candidates with either an allowed hash or no hash specified are returned. Otherwise, the given candidates are returned. Including the candidates with no hash specified when there is a match allows a warning to be logged if there is a more preferred candidate with no hash specified. Returning all candidates in the case of no matches lets pip report the hash of the candidate that would otherwise have been installed (e.g. permitting the user to more easily update their requirements file with the desired hash). """ if not hashes: logger.debug( "Given no hashes to check %s links for project %r: " "discarding no candidates", len(candidates), project_name, ) # Make sure we're not returning back the given value. return list(candidates) matches_or_no_digest = [] # Collect the non-matches for logging purposes. non_matches = [] match_count = 0 for candidate in candidates: link = candidate.link if not link.has_hash: pass elif link.is_hash_allowed(hashes=hashes): match_count += 1 else: non_matches.append(candidate) continue matches_or_no_digest.append(candidate) if match_count: filtered = matches_or_no_digest else: # Make sure we're not returning back the given value. filtered = list(candidates) if len(filtered) == len(candidates): discard_message = "discarding no candidates" else: discard_message = "discarding {} non-matches:\n {}".format( len(non_matches), "\n ".join(str(candidate.link) for candidate in non_matches), ) logger.debug( "Checked %s links for project %r against %s hashes " "(%s matches, %s no digest): %s", len(candidates), project_name, hashes.digest_count, match_count, len(matches_or_no_digest) - match_count, discard_message, ) return filtered @dataclass class CandidatePreferences: """ Encapsulates some of the preferences for filtering and sorting InstallationCandidate objects. """ prefer_binary: bool = False allow_all_prereleases: bool = False @dataclass(frozen=True) class BestCandidateResult: """A collection of candidates, returned by `PackageFinder.find_best_candidate`. This class is only intended to be instantiated by CandidateEvaluator's `compute_best_candidate()` method. :param all_candidates: A sequence of all available candidates found. :param applicable_candidates: The applicable candidates. :param best_candidate: The most preferred candidate found, or None if no applicable candidates were found. """ all_candidates: List[InstallationCandidate] applicable_candidates: List[InstallationCandidate] best_candidate: Optional[InstallationCandidate] def __post_init__(self) -> None: assert set(self.applicable_candidates) <= set(self.all_candidates) if self.best_candidate is None: assert not self.applicable_candidates else: assert self.best_candidate in self.applicable_candidates class CandidateEvaluator: """ Responsible for filtering and sorting candidates for installation based on what tags are valid. """ @classmethod def create( cls, project_name: str, target_python: Optional[TargetPython] = None, prefer_binary: bool = False, allow_all_prereleases: bool = False, specifier: Optional[specifiers.BaseSpecifier] = None, hashes: Optional[Hashes] = None, ) -> "CandidateEvaluator": """Create a CandidateEvaluator object. :param target_python: The target Python interpreter to use when checking compatibility. If None (the default), a TargetPython object will be constructed from the running Python. :param specifier: An optional object implementing `filter` (e.g. `packaging.specifiers.SpecifierSet`) to filter applicable versions. :param hashes: An optional collection of allowed hashes. """ if target_python is None: target_python = TargetPython() if specifier is None: specifier = specifiers.SpecifierSet() supported_tags = target_python.get_sorted_tags() return cls( project_name=project_name, supported_tags=supported_tags, specifier=specifier, prefer_binary=prefer_binary, allow_all_prereleases=allow_all_prereleases, hashes=hashes, ) def __init__( self, project_name: str, supported_tags: List[Tag], specifier: specifiers.BaseSpecifier, prefer_binary: bool = False, allow_all_prereleases: bool = False, hashes: Optional[Hashes] = None, ) -> None: """ :param supported_tags: The PEP 425 tags supported by the target Python in order of preference (most preferred first). """ self._allow_all_prereleases = allow_all_prereleases self._hashes = hashes self._prefer_binary = prefer_binary self._project_name = project_name self._specifier = specifier self._supported_tags = supported_tags # Since the index of the tag in the _supported_tags list is used # as a priority, precompute a map from tag to index/priority to be # used in wheel.find_most_preferred_tag. self._wheel_tag_preferences = { tag: idx for idx, tag in enumerate(supported_tags) } def get_applicable_candidates( self, candidates: List[InstallationCandidate], ) -> List[InstallationCandidate]: """ Return the applicable candidates from a list of candidates. """ # Using None infers from the specifier instead. allow_prereleases = self._allow_all_prereleases or None specifier = self._specifier # We turn the version object into a str here because otherwise # when we're debundled but setuptools isn't, Python will see # packaging.version.Version and # pkg_resources._vendor.packaging.version.Version as different # types. This way we'll use a str as a common data interchange # format. If we stop using the pkg_resources provided specifier # and start using our own, we can drop the cast to str(). candidates_and_versions = [(c, str(c.version)) for c in candidates] versions = set( specifier.filter( (v for _, v in candidates_and_versions), prereleases=allow_prereleases, ) ) applicable_candidates = [c for c, v in candidates_and_versions if v in versions] filtered_applicable_candidates = filter_unallowed_hashes( candidates=applicable_candidates, hashes=self._hashes, project_name=self._project_name, ) return sorted(filtered_applicable_candidates, key=self._sort_key) def _sort_key(self, candidate: InstallationCandidate) -> CandidateSortingKey: """ Function to pass as the `key` argument to a call to sorted() to sort InstallationCandidates by preference. Returns a tuple such that tuples sorting as greater using Python's default comparison operator are more preferred. The preference is as follows: First and foremost, candidates with allowed (matching) hashes are always preferred over candidates without matching hashes. This is because e.g. if the only candidate with an allowed hash is yanked, we still want to use that candidate. Second, excepting hash considerations, candidates that have been yanked (in the sense of PEP 592) are always less preferred than candidates that haven't been yanked. Then: If not finding wheels, they are sorted by version only. If finding wheels, then the sort order is by version, then: 1. existing installs 2. wheels ordered via Wheel.support_index_min(self._supported_tags) 3. source archives If prefer_binary was set, then all wheels are sorted above sources. Note: it was considered to embed this logic into the Link comparison operators, but then different sdist links with the same version, would have to be considered equal """ valid_tags = self._supported_tags support_num = len(valid_tags) build_tag: BuildTag = () binary_preference = 0 link = candidate.link if link.is_wheel: # can raise InvalidWheelFilename wheel = Wheel(link.filename) try: pri = -( wheel.find_most_preferred_tag( valid_tags, self._wheel_tag_preferences ) ) except ValueError: raise UnsupportedWheel( f"{wheel.filename} is not a supported wheel for this platform. It " "can't be sorted." ) if self._prefer_binary: binary_preference = 1 if wheel.build_tag is not None: match = re.match(r"^(\d+)(.)$", wheel.build_tag) assert match is not None, "guaranteed by filename validation" build_tag_groups = match.groups() build_tag = (int(build_tag_groups[0]), build_tag_groups[1]) else: # sdist pri = -(support_num) has_allowed_hash = int(link.is_hash_allowed(self._hashes)) yank_value = -1 int(link.is_yanked) # -1 for yanked. return ( has_allowed_hash, yank_value, binary_preference, candidate.version, pri, build_tag, ) def sort_best_candidate( self, candidates: List[InstallationCandidate], ) -> Optional[InstallationCandidate]: """ Return the best candidate per the instance's sort order, or None if no candidate is acceptable. """ if not candidates: return None best_candidate = max(candidates, key=self._sort_key) return best_candidate def compute_best_candidate( self, candidates: List[InstallationCandidate], ) -> BestCandidateResult: """ Compute and return a `BestCandidateResult` instance. """ applicable_candidates = self.get_applicable_candidates(candidates) best_candidate = self.sort_best_candidate(applicable_candidates) return BestCandidateResult( candidates, applicable_candidates=applicable_candidates, best_candidate=best_candidate, ) class PackageFinder: """This finds packages. This is meant to match easy_install's technique for looking for packages, by reading pages and looking for appropriate links. """ def __init__( self, link_collector: LinkCollector, target_python: TargetPython, allow_yanked: bool, format_control: Optional[FormatControl] = None, candidate_prefs: Optional[CandidatePreferences] = None, ignore_requires_python: Optional[bool] = None, ) -> None: """ This constructor is primarily meant to be used by the create() class method and from tests. :param format_control: A FormatControl object, used to control the selection of source packages / binary packages when consulting the index and links. :param candidate_prefs: Options to use when creating a CandidateEvaluator object. """ if candidate_prefs is None: candidate_prefs = CandidatePreferences() format_control = format_control or FormatControl(set(), set()) self._allow_yanked = allow_yanked self._candidate_prefs = candidate_prefs self._ignore_requires_python = ignore_requires_python self._link_collector = link_collector self._target_python = target_python self.format_control = format_control # These are boring links that have already been logged somehow. self._logged_links: Set[Tuple[Link, LinkType, str]] = set() # Don't include an allow_yanked default value to make sure each call # site considers whether yanked releases are allowed. This also causes # that decision to be made explicit in the calling code, which helps # people when reading the code. @classmethod def create( cls, link_collector: LinkCollector, selection_prefs: SelectionPreferences, target_python: Optional[TargetPython] = None, ) -> "PackageFinder": """Create a PackageFinder. :param selection_prefs: The candidate selection preferences, as a SelectionPreferences object. :param target_python: The target Python interpreter to use when checking compatibility. If None (the default), a TargetPython object will be constructed from the running Python. """ if target_python is None: target_python = TargetPython() candidate_prefs = CandidatePreferences( prefer_binary=selection_prefs.prefer_binary, allow_all_prereleases=selection_prefs.allow_all_prereleases, ) return cls( candidate_prefs=candidate_prefs, link_collector=link_collector, target_python=target_python, allow_yanked=selection_prefs.allow_yanked, format_control=selection_prefs.format_control, ignore_requires_python=selection_prefs.ignore_requires_python, ) @property def target_python(self) -> TargetPython: return self._target_python @property def search_scope(self) -> SearchScope: return self._link_collector.search_scope @search_scope.setter def search_scope(self, search_scope: SearchScope) -> None: self._link_collector.search_scope = search_scope @property def find_links(self) -> List[str]: return self._link_collector.find_links @property def index_urls(self) -> List[str]: return self.search_scope.index_urls @property def proxy(self) -> Optional[str]: return self._link_collector.session.pip_proxy @property def trusted_hosts(self) -> Iterable[str]: for host_port in self._link_collector.session.pip_trusted_origins: yield build_netloc(host_port) @property def custom_cert(self) -> Optional[str]: # session.verify is either a boolean (use default bundle/no SSL # verification) or a string path to a custom CA bundle to use. We only # care about the latter. verify = self._link_collector.session.verify return verify if isinstance(verify, str) else None @property def client_cert(self) -> Optional[str]: cert = self._link_collector.session.cert assert not isinstance(cert, tuple), "pip only supports PEM client certs" return cert @property def allow_all_prereleases(self) -> bool: return self._candidate_prefs.allow_all_prereleases def set_allow_all_prereleases(self) -> None: self._candidate_prefs.allow_all_prereleases = True @property def prefer_binary(self) -> bool: return self._candidate_prefs.prefer_binary def set_prefer_binary(self) -> None: self._candidate_prefs.prefer_binary = True def requires_python_skipped_reasons(self) -> List[str]: reasons = { detail for _, result, detail in self._logged_links if result == LinkType.requires_python_mismatch } return sorted(reasons) def make_link_evaluator(self, project_name: str) -> LinkEvaluator: canonical_name = canonicalize_name(project_name) formats = self.format_control.get_allowed_formats(canonical_name) return LinkEvaluator( project_name=project_name, canonical_name=canonical_name, formats=formats, target_python=self._target_python, allow_yanked=self._allow_yanked, ignore_requires_python=self._ignore_requires_python, ) def _sort_links(self, links: Iterable[Link]) -> List[Link]: """ Returns elements of links in order, non-egg links first, egg links second, while eliminating duplicates """ eggs, no_eggs = [], [] seen: Set[Link] = set() for link in links: if link not in seen: seen.add(link) if link.egg_fragment: eggs.append(link) else: no_eggs.append(link) return no_eggs + eggs def _log_skipped_link(self, link: Link, result: LinkType, detail: str) -> None: # This is a hot method so don't waste time hashing links unless we're # actually going to log 'em. if not logger.isEnabledFor(logging.DEBUG): return entry = (link, result, detail) if entry not in self._logged_links: # Put the link at the end so the reason is more visible and because # the link string is usually very long. logger.debug("Skipping link: %s: %s", detail, link) self._logged_links.add(entry) def get_install_candidate( self, link_evaluator: LinkEvaluator, link: Link ) -> Optional[InstallationCandidate]: """ If the link is a candidate for install, convert it to an InstallationCandidate and return it. Otherwise, return None. """ result, detail = link_evaluator.evaluate_link(link) if result != LinkType.candidate: self._log_skipped_link(link, result, detail) return None try: return InstallationCandidate( name=link_evaluator.project_name, link=link, version=detail, ) except InvalidVersion: return None def evaluate_links( self, link_evaluator: LinkEvaluator, links: Iterable[Link] ) -> List[InstallationCandidate]: """ Convert links that are candidates to InstallationCandidate objects. """ candidates = [] for link in self._sort_links(links): candidate = self.get_install_candidate(link_evaluator, link) if candidate is not None: candidates.append(candidate) return candidates def process_project_url( self, project_url: Link, link_evaluator: LinkEvaluator ) -> List[InstallationCandidate]: logger.debug( "Fetching project page and analyzing links: %s", project_url, ) index_response = self._link_collector.fetch_response(project_url) if index_response is None: return [] page_links = list(parse_links(index_response)) with indent_log(): package_links = self.evaluate_links( link_evaluator, links=page_links, ) return package_links @functools.lru_cache(maxsize=None) def find_all_candidates(self, project_name: str) -> List[InstallationCandidate]: """Find all available InstallationCandidate for project_name This checks index_urls and find_links. All versions found are returned as an InstallationCandidate list. See LinkEvaluator.evaluate_link() for details on which files are accepted. """ link_evaluator = self.make_link_evaluator(project_name) collected_sources = self._link_collector.collect_sources( project_name=project_name, candidates_from_page=functools.partial( self.process_project_url, link_evaluator=link_evaluator, ), ) page_candidates_it = itertools.chain.from_iterable( source.page_candidates() for sources in collected_sources for source in sources if source is not None ) page_candidates = list(page_candidates_it) file_links_it = itertools.chain.from_iterable( source.file_links() for sources in collected_sources for source in sources if source is not None ) file_candidates = self.evaluate_links( link_evaluator, sorted(file_links_it, reverse=True), ) if logger.isEnabledFor(logging.DEBUG) and file_candidates: paths = [] for candidate in file_candidates: assert candidate.link.url # we need to have a URL try: paths.append(candidate.link.file_path) except Exception: paths.append(candidate.link.url) # it's not a local file logger.debug("Local files found: %s", ", ".join(paths)) # This is an intentional priority ordering return file_candidates + page_candidates def make_candidate_evaluator( self, project_name: str, specifier: Optional[specifiers.BaseSpecifier] = None, hashes: Optional[Hashes] = None, ) -> CandidateEvaluator: """Create a CandidateEvaluator object to use.""" candidate_prefs = self._candidate_prefs return CandidateEvaluator.create( project_name=project_name, target_python=self._target_python, prefer_binary=candidate_prefs.prefer_binary, allow_all_prereleases=candidate_prefs.allow_all_prereleases, specifier=specifier, hashes=hashes, ) @functools.lru_cache(maxsize=None) def find_best_candidate( self, project_name: str, specifier: Optional[specifiers.BaseSpecifier] = None, hashes: Optional[Hashes] = None, ) -> BestCandidateResult: """Find matches for the given project and specifier. :param specifier: An optional object implementing `filter` (e.g. `packaging.specifiers.SpecifierSet`) to filter applicable versions. :return: A `BestCandidateResult` instance. """ candidates = self.find_all_candidates(project_name) candidate_evaluator = self.make_candidate_evaluator( project_name=project_name, specifier=specifier, hashes=hashes, ) return candidate_evaluator.compute_best_candidate(candidates) def find_requirement( self, req: InstallRequirement, upgrade: bool ) -> Optional[InstallationCandidate]: """Try to find a Link matching req Expects req, an InstallRequirement and upgrade, a boolean Returns a InstallationCandidate if found, Raises DistributionNotFound or BestVersionAlreadyInstalled otherwise """ hashes = req.hashes(trust_internet=False) best_candidate_result = self.find_best_candidate( req.name, specifier=req.specifier, hashes=hashes, ) best_candidate = best_candidate_result.best_candidate installed_version: Optional[_BaseVersion] = None if req.satisfied_by is not None: installed_version = req.satisfied_by.version def _format_versions(cand_iter: Iterable[InstallationCandidate]) -> str: # This repeated parse_version and str() conversion is needed to # handle different vendoring sources from pip and pkg_resources. # If we stop using the pkg_resources provided specifier and start # using our own, we can drop the cast to str(). return ( ", ".join( sorted( {str(c.version) for c in cand_iter}, key=parse_version, ) ) or "none" ) if installed_version is None and best_candidate is None: logger.critical( "Could not find a version that satisfies the requirement %s " "(from versions: %s)", req, _format_versions(best_candidate_result.all_candidates), ) raise DistributionNotFound(f"No matching distribution found for {req}") def _should_install_candidate( candidate: Optional[InstallationCandidate], ) -> "TypeGuard[InstallationCandidate]": if installed_version is None: return True if best_candidate is None: return False return best_candidate.version > installed_version if not upgrade and installed_version is not None: if _should_install_candidate(best_candidate): logger.debug( "Existing installed version (%s) satisfies requirement " "(most up-to-date version is %s)", installed_version, best_candidate.version, ) else: logger.debug( "Existing installed version (%s) is most up-to-date and " "satisfies requirement", installed_version, ) return None if _should_install_candidate(best_candidate): logger.debug( "Using version %s (newest of versions: %s)", best_candidate.version, _format_versions(best_candidate_result.applicable_candidates), ) return best_candidate # We have an existing version, and its the best version logger.debug( "Installed version (%s) is most up-to-date (past versions: %s)", installed_version, _format_versions(best_candidate_result.applicable_candidates), ) raise BestVersionAlreadyInstalled def _find_name_version_sep(fragment: str, canonical_name: str) -> int: """Find the separator's index based on the package's canonical name. :param fragment: A <package>+<version> filename "fragment" (stem) or egg fragment. :param canonical_name: The package's canonical name. This function is needed since the canonicalized name does not necessarily have the same length as the egg info's name part. An example:: >>> fragment = 'foo__bar-1.0' >>> canonical_name = 'foo-bar' >>> _find_name_version_sep(fragment, canonical_name) 8 """ # Project name and version must be separated by one single dash. Find all # occurrences of dashes; if the string in front of it matches the canonical # name, this is the one separating the name and version parts. for i, c in enumerate(fragment): if c != "-": continue if canonicalize_name(fragment[:i]) == canonical_name: return i raise ValueError(f"{fragment} does not match {canonical_name}") def _extract_version_from_fragment(fragment: str, canonical_name: str) -> Optional[str]: """Parse the version string from a <package>+<version> filename "fragment" (stem) or egg fragment. :param fragment: The string to parse. E.g. foo-2.1 :param canonical_name: The canonicalized name of the package this belongs to. 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File must have a valid wheel or sdist name, # otherwise not worth considering as a package try: project_filename = parse_wheel_filename(entry.name)[0] except InvalidWheelFilename: try: project_filename = parse_sdist_filename(entry.name)[0] except InvalidSdistFilename: continue self._project_name_to_urls[project_filename].append(url) self._scanned_directory = True @property def page_candidates(self) -> List[str]: if not self._scanned_directory: self._scan_directory() return self._page_candidates @property def project_name_to_urls(self) -> Dict[str, List[str]]: if not self._scanned_directory: self._scan_directory() return self._project_name_to_urls class _FlatDirectorySource(LinkSource): """Link source specified by ``--find-links=<path-to-dir>``. This looks the content of the directory, and returns: ``page_candidates``: Links listed on each HTML file in the directory. * ``file_candidates``: Archives in the directory. """ _paths_to_urls: Dict[str, _FlatDirectoryToUrls] = {} def __init__( self, candidates_from_page: CandidatesFromPage, path: str, project_name: str, ) -> None: self._candidates_from_page = candidates_from_page self._project_name = canonicalize_name(project_name) # Get existing instance of _FlatDirectoryToUrls if it exists if path in self._paths_to_urls: self._path_to_urls = self._paths_to_urls[path] else: self._path_to_urls = _FlatDirectoryToUrls(path=path) self._paths_to_urls[path] = self._path_to_urls @property def link(self) -> Optional[Link]: return None def page_candidates(self) -> FoundCandidates: for url in self._path_to_urls.page_candidates: yield from self._candidates_from_page(Link(url)) def file_links(self) -> FoundLinks: for url in self._path_to_urls.project_name_to_urls[self._project_name]: yield Link(url) class _LocalFileSource(LinkSource): """``--find-links=<path-or-url>`` or ``--[extra-]index-url=<path-or-url>``. If a URL is supplied, it must be a ``file:`` URL. If a path is supplied to the option, it is converted to a URL first. This returns: * ``page_candidates``: Links listed on an HTML file. * ``file_candidates``: The non-HTML file. """ def __init__( self, candidates_from_page: CandidatesFromPage, link: Link, ) -> None: self._candidates_from_page = candidates_from_page self._link = link @property def link(self) -> Optional[Link]: return self._link def page_candidates(self) -> FoundCandidates: if not _is_html_file(self._link.url): return yield from self._candidates_from_page(self._link) def file_links(self) -> FoundLinks: if _is_html_file(self._link.url): return yield self._link class _RemoteFileSource(LinkSource): """``--find-links=<url>`` or ``--[extra-]index-url=<url>``. This returns: * ``page_candidates``: Links listed on an HTML file. * ``file_candidates``: The non-HTML file. """ def __init__( self, candidates_from_page: CandidatesFromPage, page_validator: PageValidator, link: Link, ) -> None: self._candidates_from_page = candidates_from_page self._page_validator = page_validator self._link = link @property def link(self) -> Optional[Link]: return self._link def page_candidates(self) -> FoundCandidates: if not self._page_validator(self._link): return yield from self._candidates_from_page(self._link) def file_links(self) -> FoundLinks: yield self._link class _IndexDirectorySource(LinkSource): """``--[extra-]index-url=<path-to-directory>``. This is treated like a remote URL; ``candidates_from_page`` contains logic for this by appending ``index.html`` to the link. """ def __init__( self, candidates_from_page: CandidatesFromPage, link: Link, ) -> None: self._candidates_from_page = candidates_from_page self._link = link @property def link(self) -> Optional[Link]: return self._link def page_candidates(self) -> FoundCandidates: yield from self._candidates_from_page(self._link) def file_links(self) -> FoundLinks: return () def build_source( location: str, *, candidates_from_page: CandidatesFromPage, page_validator: PageValidator, expand_dir: bool, cache_link_parsing: bool, project_name: str, ) -> Tuple[Optional[str], Optional[LinkSource]]: path: Optional[str] = None url: Optional[str] = None if os.path.exists(location): # Is a local path. url = path_to_url(location) path = location elif location.startswith("file:"): # A file: URL. url = location path = url_to_path(location) elif is_url(location): url = location if url is None: msg = ( "Location '%s' is ignored: " "it is either a non-existing path or lacks a specific scheme." ) logger.warning(msg, location) return (None, None) if path is None: source: LinkSource = _RemoteFileSource( candidates_from_page=candidates_from_page, page_validator=page_validator, link=Link(url, cache_link_parsing=cache_link_parsing), ) return (url, source) if os.path.isdir(path): if expand_dir: source = _FlatDirectorySource( candidates_from_page=candidates_from_page, path=path, project_name=project_name, ) else: source = _IndexDirectorySource( candidates_from_page=candidates_from_page, link=Link(url, cache_link_parsing=cache_link_parsing), ) return (url, source) elif os.path.isfile(path): source = _LocalFileSource( candidates_from_page=candidates_from_page, link=Link(url, cache_link_parsing=cache_link_parsing), ) return (url, source) logger.warning( "Location '%s' is ignored: it is neither a file nor a directory.", location, ) return (url, None) ��__init__.py��0000644��00000000036�15030224355�0006653 0��ustar�00��"""Index interaction code """ ��

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