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"""Cache Management
"""
import errno
import hashlib
import logging
import os
from pip._vendor.packaging.utils import canonicalize_name
from pip._internal.download import path_to_url
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.wheel import InvalidWheelFilename, Wheel
if MYPY_CHECK_RUNNING:
from typing import Optional, Set, List, Any # noqa: F401
from pip._internal.index import FormatControl # noqa: F401
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, package_name):
# type: (Link, Optional[str]) -> 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, package_name):
# type: (Link, Optional[str]) -> Link
candidates = []
for wheel_name in self._get_candidates(link, package_name):
try:
wheel = Wheel(wheel_name)
except InvalidWheelFilename:
continue
if not wheel.supported():
# Built for a different python/arch/etc
continue
candidates.append((wheel.support_index_min(), 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")
self._temp_dir.create()
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, package_name):
# type: (Link, Optional[str]) -> Link
retval = self._wheel_cache.get(link, package_name)
if retval is link:
retval = self._ephem_cache.get(link, package_name)
return retval
def cleanup(self):
# type: () -> None
self._wheel_cache.cleanup()
self._ephem_cache.cleanup()
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