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265 lines
9.2 KiB
265 lines
9.2 KiB
3 years ago
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"""Cache Management
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"""
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import hashlib
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import json
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import logging
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import os
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from typing import Any, Dict, List, Optional, Set
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from pip._vendor.packaging.tags import Tag, interpreter_name, interpreter_version
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from pip._vendor.packaging.utils import canonicalize_name
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from pip._internal.exceptions import InvalidWheelFilename
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from pip._internal.models.format_control import FormatControl
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from pip._internal.models.link import Link
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from pip._internal.models.wheel import Wheel
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from pip._internal.utils.temp_dir import TempDirectory, tempdir_kinds
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from pip._internal.utils.urls import path_to_url
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logger = logging.getLogger(__name__)
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def _hash_dict(d: Dict[str, str]) -> str:
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"""Return a stable sha224 of a dictionary."""
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s = json.dumps(d, sort_keys=True, separators=(",", ":"), ensure_ascii=True)
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return hashlib.sha224(s.encode("ascii")).hexdigest()
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class Cache:
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"""An abstract class - provides cache directories for data from links
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:param cache_dir: The root of the cache.
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:param format_control: An object of FormatControl class to limit
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binaries being read from the cache.
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:param allowed_formats: which formats of files the cache should store.
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('binary' and 'source' are the only allowed values)
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"""
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def __init__(
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self, cache_dir: str, format_control: FormatControl, allowed_formats: Set[str]
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) -> None:
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super().__init__()
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assert not cache_dir or os.path.isabs(cache_dir)
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self.cache_dir = cache_dir or None
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self.format_control = format_control
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self.allowed_formats = allowed_formats
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_valid_formats = {"source", "binary"}
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assert self.allowed_formats.union(_valid_formats) == _valid_formats
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def _get_cache_path_parts(self, link: Link) -> List[str]:
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"""Get parts of part that must be os.path.joined with cache_dir"""
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# We want to generate an url to use as our cache key, we don't want to
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# just re-use the URL because it might have other items in the fragment
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# and we don't care about those.
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key_parts = {"url": link.url_without_fragment}
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if link.hash_name is not None and link.hash is not None:
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key_parts[link.hash_name] = link.hash
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if link.subdirectory_fragment:
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key_parts["subdirectory"] = link.subdirectory_fragment
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# Include interpreter name, major and minor version in cache key
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# to cope with ill-behaved sdists that build a different wheel
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# depending on the python version their setup.py is being run on,
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# and don't encode the difference in compatibility tags.
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# https://github.com/pypa/pip/issues/7296
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key_parts["interpreter_name"] = interpreter_name()
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key_parts["interpreter_version"] = interpreter_version()
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# Encode our key url with sha224, we'll use this because it has similar
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# security properties to sha256, but with a shorter total output (and
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# thus less secure). However the differences don't make a lot of
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# difference for our use case here.
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hashed = _hash_dict(key_parts)
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# We want to nest the directories some to prevent having a ton of top
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# level directories where we might run out of sub directories on some
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# FS.
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parts = [hashed[:2], hashed[2:4], hashed[4:6], hashed[6:]]
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return parts
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def _get_candidates(self, link: Link, canonical_package_name: str) -> List[Any]:
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can_not_cache = not self.cache_dir or not canonical_package_name or not link
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if can_not_cache:
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return []
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formats = self.format_control.get_allowed_formats(canonical_package_name)
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if not self.allowed_formats.intersection(formats):
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return []
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candidates = []
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path = self.get_path_for_link(link)
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if os.path.isdir(path):
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for candidate in os.listdir(path):
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candidates.append((candidate, path))
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return candidates
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def get_path_for_link(self, link: Link) -> str:
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"""Return a directory to store cached items in for link."""
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raise NotImplementedError()
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def get(
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self,
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link: Link,
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package_name: Optional[str],
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supported_tags: List[Tag],
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) -> Link:
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"""Returns a link to a cached item if it exists, otherwise returns the
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passed link.
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"""
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raise NotImplementedError()
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class SimpleWheelCache(Cache):
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"""A cache of wheels for future installs."""
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def __init__(self, cache_dir: str, format_control: FormatControl) -> None:
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super().__init__(cache_dir, format_control, {"binary"})
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def get_path_for_link(self, link: Link) -> str:
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"""Return a directory to store cached wheels for link
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Because there are M wheels for any one sdist, we provide a directory
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to cache them in, and then consult that directory when looking up
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cache hits.
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We only insert things into the cache if they have plausible version
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numbers, so that we don't contaminate the cache with things that were
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not unique. E.g. ./package might have dozens of installs done for it
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and build a version of 0.0...and if we built and cached a wheel, we'd
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end up using the same wheel even if the source has been edited.
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:param link: The link of the sdist for which this will cache wheels.
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"""
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parts = self._get_cache_path_parts(link)
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assert self.cache_dir
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# Store wheels within the root cache_dir
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return os.path.join(self.cache_dir, "wheels", *parts)
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def get(
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self,
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link: Link,
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package_name: Optional[str],
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supported_tags: List[Tag],
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) -> Link:
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candidates = []
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if not package_name:
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return link
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canonical_package_name = canonicalize_name(package_name)
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for wheel_name, wheel_dir in self._get_candidates(link, canonical_package_name):
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try:
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wheel = Wheel(wheel_name)
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except InvalidWheelFilename:
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continue
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if canonicalize_name(wheel.name) != canonical_package_name:
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logger.debug(
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"Ignoring cached wheel %s for %s as it "
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"does not match the expected distribution name %s.",
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wheel_name,
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link,
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package_name,
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)
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continue
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if not wheel.supported(supported_tags):
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# Built for a different python/arch/etc
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continue
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candidates.append(
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(
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wheel.support_index_min(supported_tags),
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wheel_name,
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wheel_dir,
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)
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)
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if not candidates:
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return link
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_, wheel_name, wheel_dir = min(candidates)
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return Link(path_to_url(os.path.join(wheel_dir, wheel_name)))
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class EphemWheelCache(SimpleWheelCache):
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"""A SimpleWheelCache that creates it's own temporary cache directory"""
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def __init__(self, format_control: FormatControl) -> None:
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self._temp_dir = TempDirectory(
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kind=tempdir_kinds.EPHEM_WHEEL_CACHE,
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globally_managed=True,
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)
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super().__init__(self._temp_dir.path, format_control)
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class CacheEntry:
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def __init__(
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self,
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link: Link,
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persistent: bool,
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):
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self.link = link
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self.persistent = persistent
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class WheelCache(Cache):
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"""Wraps EphemWheelCache and SimpleWheelCache into a single Cache
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This Cache allows for gracefully degradation, using the ephem wheel cache
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when a certain link is not found in the simple wheel cache first.
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"""
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def __init__(self, cache_dir: str, format_control: FormatControl) -> None:
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super().__init__(cache_dir, format_control, {"binary"})
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self._wheel_cache = SimpleWheelCache(cache_dir, format_control)
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self._ephem_cache = EphemWheelCache(format_control)
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def get_path_for_link(self, link: Link) -> str:
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return self._wheel_cache.get_path_for_link(link)
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def get_ephem_path_for_link(self, link: Link) -> str:
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return self._ephem_cache.get_path_for_link(link)
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def get(
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self,
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link: Link,
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package_name: Optional[str],
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supported_tags: List[Tag],
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) -> Link:
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cache_entry = self.get_cache_entry(link, package_name, supported_tags)
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if cache_entry is None:
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return link
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return cache_entry.link
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def get_cache_entry(
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self,
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link: Link,
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package_name: Optional[str],
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supported_tags: List[Tag],
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) -> Optional[CacheEntry]:
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"""Returns a CacheEntry with a link to a cached item if it exists or
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None. The cache entry indicates if the item was found in the persistent
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or ephemeral cache.
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"""
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retval = self._wheel_cache.get(
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link=link,
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package_name=package_name,
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supported_tags=supported_tags,
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)
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if retval is not link:
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return CacheEntry(retval, persistent=True)
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retval = self._ephem_cache.get(
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link=link,
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package_name=package_name,
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supported_tags=supported_tags,
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)
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if retval is not link:
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return CacheEntry(retval, persistent=False)
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return None
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