mirror of
https://gitlab.sectorq.eu/jaydee/omv_backup.git
synced 2025-10-31 10:31:11 +01:00
294 lines
10 KiB
Python
Executable File
294 lines
10 KiB
Python
Executable File
"""Cache Management
|
|
"""
|
|
|
|
import hashlib
|
|
import json
|
|
import logging
|
|
import os
|
|
from pathlib import Path
|
|
from typing import Any, Dict, List, Optional, Set
|
|
|
|
from pip._vendor.packaging.tags import Tag, interpreter_name, interpreter_version
|
|
from pip._vendor.packaging.utils import canonicalize_name
|
|
|
|
from pip._internal.exceptions import InvalidWheelFilename
|
|
from pip._internal.models.direct_url import DirectUrl
|
|
from pip._internal.models.format_control import FormatControl
|
|
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.urls import path_to_url
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
ORIGIN_JSON_NAME = "origin.json"
|
|
|
|
|
|
def _hash_dict(d: 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:
|
|
"""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: str, format_control: FormatControl, allowed_formats: Set[str]
|
|
) -> None:
|
|
super().__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(self, link: 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: Link, canonical_package_name: 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))
|
|
return candidates
|
|
|
|
def get_path_for_link(self, link: Link) -> str:
|
|
"""Return a directory to store cached items in for link."""
|
|
raise NotImplementedError()
|
|
|
|
def get(
|
|
self,
|
|
link: Link,
|
|
package_name: Optional[str],
|
|
supported_tags: List[Tag],
|
|
) -> 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: str, format_control: FormatControl) -> None:
|
|
super().__init__(cache_dir, format_control, {"binary"})
|
|
|
|
def get_path_for_link(self, link: 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)
|
|
assert self.cache_dir
|
|
# Store wheels within the root cache_dir
|
|
return os.path.join(self.cache_dir, "wheels", *parts)
|
|
|
|
def get(
|
|
self,
|
|
link: Link,
|
|
package_name: Optional[str],
|
|
supported_tags: List[Tag],
|
|
) -> 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 %s for %s as it "
|
|
"does not match the expected distribution name %s.",
|
|
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: FormatControl) -> None:
|
|
self._temp_dir = TempDirectory(
|
|
kind=tempdir_kinds.EPHEM_WHEEL_CACHE,
|
|
globally_managed=True,
|
|
)
|
|
|
|
super().__init__(self._temp_dir.path, format_control)
|
|
|
|
|
|
class CacheEntry:
|
|
def __init__(
|
|
self,
|
|
link: Link,
|
|
persistent: bool,
|
|
):
|
|
self.link = link
|
|
self.persistent = persistent
|
|
self.origin: Optional[DirectUrl] = None
|
|
origin_direct_url_path = Path(self.link.file_path).parent / ORIGIN_JSON_NAME
|
|
if origin_direct_url_path.exists():
|
|
self.origin = DirectUrl.from_json(origin_direct_url_path.read_text())
|
|
|
|
|
|
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: str, format_control: Optional[FormatControl] = None
|
|
) -> None:
|
|
if format_control is None:
|
|
format_control = FormatControl()
|
|
super().__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: Link) -> str:
|
|
return self._wheel_cache.get_path_for_link(link)
|
|
|
|
def get_ephem_path_for_link(self, link: Link) -> str:
|
|
return self._ephem_cache.get_path_for_link(link)
|
|
|
|
def get(
|
|
self,
|
|
link: Link,
|
|
package_name: Optional[str],
|
|
supported_tags: List[Tag],
|
|
) -> 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: Link,
|
|
package_name: Optional[str],
|
|
supported_tags: List[Tag],
|
|
) -> 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
|
|
|
|
@staticmethod
|
|
def record_download_origin(cache_dir: str, download_info: DirectUrl) -> None:
|
|
origin_path = Path(cache_dir) / ORIGIN_JSON_NAME
|
|
if origin_path.is_file():
|
|
origin = DirectUrl.from_json(origin_path.read_text())
|
|
# TODO: use DirectUrl.equivalent when https://github.com/pypa/pip/pull/10564
|
|
# is merged.
|
|
if origin.url != download_info.url:
|
|
logger.warning(
|
|
"Origin URL %s in cache entry %s does not match download URL %s. "
|
|
"This is likely a pip bug or a cache corruption issue.",
|
|
origin.url,
|
|
cache_dir,
|
|
download_info.url,
|
|
)
|
|
origin_path.write_text(download_info.to_json(), encoding="utf-8")
|