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root
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lib
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python3.8
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pip
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_internal
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cache.py
"""Cache Management """ # The following comment should be removed at some point in the future. # mypy: strict-optional=False import errno import hashlib import logging import os from pip._vendor.packaging.utils import canonicalize_name from pip._internal.models.link import Link from pip._internal.utils.compat import expanduser from pip._internal.utils.temp_dir import TempDirectory from pip._internal.utils.typing import MYPY_CHECK_RUNNING from pip._internal.utils.urls import path_to_url from pip._internal.wheel import InvalidWheelFilename, Wheel if MYPY_CHECK_RUNNING: from typing import Optional, Set, List, Any from pip._internal.index import FormatControl from pip._internal.pep425tags import Pep425Tag logger = logging.getLogger(__name__) class Cache(object): """An abstract class - provides cache directories for data from links :param cache_dir: The root of the cache. :param format_control: An object of FormatControl class to limit binaries being read from the cache. :param allowed_formats: which formats of files the cache should store. ('binary' and 'source' are the only allowed values) """ def __init__(self, cache_dir, format_control, allowed_formats): # type: (str, FormatControl, Set[str]) -> None super(Cache, self).__init__() self.cache_dir = expanduser(cache_dir) if cache_dir else None self.format_control = format_control self.allowed_formats = allowed_formats _valid_formats = {"source", "binary"} assert self.allowed_formats.union(_valid_formats) == _valid_formats def _get_cache_path_parts(self, link): # type: (Link) -> List[str] """Get parts of part that must be os.path.joined with cache_dir """ # We want to generate an url to use as our cache key, we don't want to # just re-use the URL because it might have other items in the fragment # and we don't care about those. key_parts = [link.url_without_fragment] if link.hash_name is not None and link.hash is not None: key_parts.append("=".join([link.hash_name, link.hash])) key_url = "#".join(key_parts) # Encode our key url with sha224, we'll use this because it has similar # security properties to sha256, but with a shorter total output (and # thus less secure). However the differences don't make a lot of # difference for our use case here. hashed = hashlib.sha224(key_url.encode()).hexdigest() # We want to nest the directories some to prevent having a ton of top # level directories where we might run out of sub directories on some # FS. parts = [hashed[:2], hashed[2:4], hashed[4:6], hashed[6:]] return parts def _get_candidates(self, link, package_name): # type: (Link, Optional[str]) -> List[Any] can_not_cache = ( not self.cache_dir or not package_name or not link ) if can_not_cache: return [] canonical_name = canonicalize_name(package_name) formats = self.format_control.get_allowed_formats( canonical_name ) if not self.allowed_formats.intersection(formats): return [] root = self.get_path_for_link(link) try: return os.listdir(root) except OSError as err: if err.errno in {errno.ENOENT, errno.ENOTDIR}: return [] raise def get_path_for_link(self, link): # type: (Link) -> str """Return a directory to store cached items in for link. """ raise NotImplementedError() def get( self, link, # type: Link package_name, # type: Optional[str] supported_tags, # type: List[Pep425Tag] ): # type: (...) -> Link """Returns a link to a cached item if it exists, otherwise returns the passed link. """ raise NotImplementedError() def _link_for_candidate(self, link, candidate): # type: (Link, str) -> Link root = self.get_path_for_link(link) path = os.path.join(root, candidate) return Link(path_to_url(path)) def cleanup(self): # type: () -> None pass class SimpleWheelCache(Cache): """A cache of wheels for future installs. """ def __init__(self, cache_dir, format_control): # type: (str, FormatControl) -> None super(SimpleWheelCache, self).__init__( cache_dir, format_control, {"binary"} ) def get_path_for_link(self, link): # type: (Link) -> str """Return a directory to store cached wheels for link Because there are M wheels for any one sdist, we provide a directory to cache them in, and then consult that directory when looking up cache hits. We only insert things into the cache if they have plausible version numbers, so that we don't contaminate the cache with things that were not unique. E.g. ./package might have dozens of installs done for it and build a version of 0.0...and if we built and cached a wheel, we'd end up using the same wheel even if the source has been edited. :param link: The link of the sdist for which this will cache wheels. """ parts = self._get_cache_path_parts(link) # Store wheels within the root cache_dir return os.path.join(self.cache_dir, "wheels", *parts) def get( self, link, # type: Link package_name, # type: Optional[str] supported_tags, # type: List[Pep425Tag] ): # type: (...) -> Link candidates = [] for wheel_name in self._get_candidates(link, package_name): try: wheel = Wheel(wheel_name) except InvalidWheelFilename: continue if not wheel.supported(supported_tags): # Built for a different python/arch/etc continue candidates.append( (wheel.support_index_min(supported_tags), wheel_name) ) if not candidates: return link return self._link_for_candidate(link, min(candidates)[1]) class EphemWheelCache(SimpleWheelCache): """A SimpleWheelCache that creates it's own temporary cache directory """ def __init__(self, format_control): # type: (FormatControl) -> None self._temp_dir = TempDirectory(kind="ephem-wheel-cache") super(EphemWheelCache, self).__init__( self._temp_dir.path, format_control ) def cleanup(self): # type: () -> None self._temp_dir.cleanup() class WheelCache(Cache): """Wraps EphemWheelCache and SimpleWheelCache into a single Cache This Cache allows for gracefully degradation, using the ephem wheel cache when a certain link is not found in the simple wheel cache first. """ def __init__(self, cache_dir, format_control): # type: (str, FormatControl) -> None super(WheelCache, self).__init__( cache_dir, format_control, {'binary'} ) self._wheel_cache = SimpleWheelCache(cache_dir, format_control) self._ephem_cache = EphemWheelCache(format_control) def get_path_for_link(self, link): # type: (Link) -> str return self._wheel_cache.get_path_for_link(link) def get_ephem_path_for_link(self, link): # type: (Link) -> str return self._ephem_cache.get_path_for_link(link) def get( self, link, # type: Link package_name, # type: Optional[str] supported_tags, # type: List[Pep425Tag] ): # type: (...) -> Link retval = self._wheel_cache.get( link=link, package_name=package_name, supported_tags=supported_tags, ) if retval is not link: return retval return self._ephem_cache.get( link=link, package_name=package_name, supported_tags=supported_tags, ) def cleanup(self): # type: () -> None self._wheel_cache.cleanup() self._ephem_cache.cleanup()
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