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"""Cache Management """ # The following comment should be removed at some point in the future. # mypy: strict-optional=False import hashlib import json import logging import os from pip._vendor.packaging.tags import interpreter_name, interpreter_version from pip._vendor.packaging.utils import canonicalize_name from pip._internal.exceptions import InvalidWheelFilename from pip._internal.models.link import Link from pip._internal.models.wheel import Wheel from pip._internal.utils.temp_dir import TempDirectory, tempdir_kinds from pip._internal.utils.typing import MYPY_CHECK_RUNNING from pip._internal.utils.urls import path_to_url if MYPY_CHECK_RUNNING: from typing import Optional, Set, List, Any, Dict from pip._vendor.packaging.tags import Tag from pip._internal.models.format_control import FormatControl logger = logging.getLogger(__name__) def _hash_dict(d): # type: (Dict[str, str]) -> str """Return a stable sha224 of a dictionary.""" s = json.dumps(d, sort_keys=True, separators=(",", ":"), ensure_ascii=True) return hashlib.sha224(s.encode("ascii")).hexdigest() 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__() assert not cache_dir or os.path.isabs(cache_dir) self.cache_dir = cache_dir or 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_legacy(self, link): # type: (Link) -> List[str] """Get parts of part that must be os.path.joined with cache_dir Legacy cache key (pip < 20) for compatibility with older caches. """ # 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_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 = {"url": link.url_without_fragment} if link.hash_name is not None and link.hash is not None: key_parts[link.hash_name] = link.hash if link.subdirectory_fragment: key_parts["subdirectory"] = link.subdirectory_fragment # Include interpreter name, major and minor version in cache key # to cope with ill-behaved sdists that build a different wheel # depending on the python version their setup.py is being run on, # and don't encode the difference in compatibility tags. # https://github.com/pypa/pip/issues/7296 key_parts["interpreter_name"] = interpreter_name() key_parts["interpreter_version"] = interpreter_version() # 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 = _hash_dict(key_parts) # 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, canonical_package_name): # type: (Link, Optional[str]) -> List[Any] can_not_cache = ( not self.cache_dir or not canonical_package_name or not link ) if can_not_cache: return [] formats = self.format_control.get_allowed_formats( canonical_package_name ) if not self.allowed_formats.intersection(formats): return [] candidates = [] path = self.get_path_for_link(link) if os.path.isdir(path): for candidate in os.listdir(path): candidates.append((candidate, path)) # TODO remove legacy path lookup in pip>=21 legacy_path = self.get_path_for_link_legacy(link) if os.path.isdir(legacy_path): for candidate in os.listdir(legacy_path): candidates.append((candidate, legacy_path)) return candidates def get_path_for_link_legacy(self, link): # type: (Link) -> str raise NotImplementedError() 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[Tag] ): # type: (...) -> Link """Returns a link to a cached item if it exists, otherwise returns the passed link. """ raise NotImplementedError() 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_legacy(self, link): # type: (Link) -> str parts = self._get_cache_path_parts_legacy(link) return os.path.join(self.cache_dir, "wheels", *parts) 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[Tag] ): # type: (...) -> Link candidates = [] if not package_name: return link canonical_package_name = canonicalize_name(package_name) for wheel_name, wheel_dir in self._get_candidates( link, canonical_package_name ): try: wheel = Wheel(wheel_name) except InvalidWheelFilename: continue if canonicalize_name(wheel.name) != canonical_package_name: logger.debug( "Ignoring cached wheel {} for {} as it " "does not match the expected distribution name {}.".format( wheel_name, link, package_name ) ) 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, wheel_dir, ) ) if not candidates: return link _, wheel_name, wheel_dir = min(candidates) return Link(path_to_url(os.path.join(wheel_dir, wheel_name))) 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=tempdir_kinds.EPHEM_WHEEL_CACHE, globally_managed=True, ) super(EphemWheelCache, self).__init__( self._temp_dir.path, format_control ) class CacheEntry(object): def __init__( self, link, # type: Link persistent, # type: bool ): self.link = link self.persistent = persistent 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_legacy(self, link): # type: (Link) -> str return self._wheel_cache.get_path_for_link_legacy(link) 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[Tag] ): # type: (...) -> Link cache_entry = self.get_cache_entry(link, package_name, supported_tags) if cache_entry is None: return link return cache_entry.link def get_cache_entry( self, link, # type: Link package_name, # type: Optional[str] supported_tags, # type: List[Tag] ): # type: (...) -> Optional[CacheEntry] """Returns a CacheEntry with a link to a cached item if it exists or None. The cache entry indicates if the item was found in the persistent or ephemeral cache. """ retval = self._wheel_cache.get( link=link, package_name=package_name, supported_tags=supported_tags, ) if retval is not link: return CacheEntry(retval, persistent=True) retval = self._ephem_cache.get( link=link, package_name=package_name, supported_tags=supported_tags, ) if retval is not link: return CacheEntry(retval, persistent=False) return None