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📁 ..	-	2026-03-21 15:56
📄 LICENSE.txt Copyright 2012-2021 Eric Larson Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.	558 B	2026-01-20 12:58
📄 __init__.py # SPDX-FileCopyrightText: 2015 Eric Larson # # SPDX-License-Identifier: Apache-2.0 """CacheControl import Interface. Make it easy to import from cachecontrol without long namespaces. """ __author__ = "Eric Larson" __email__ = "eric@ionrock.org" __version__ = "0.14.3" from pip._vendor.cachecontrol.adapter import CacheControlAdapter from pip._vendor.cachecontrol.controller import CacheController from pip._vendor.cachecontrol.wrapper import CacheControl __all__ = [ "__author__", "__email__", "__version__", "CacheControlAdapter", "CacheController", "CacheControl", ] import logging logging.getLogger(__name__).addHandler(logging.NullHandler())	677 B	2026-01-20 12:58
📁 __pycache__	-	2026-03-21 15:45
📄 _cmd.py # SPDX-FileCopyrightText: 2015 Eric Larson # # SPDX-License-Identifier: Apache-2.0 from __future__ import annotations import logging from argparse import ArgumentParser from typing import TYPE_CHECKING from pip._vendor import requests from pip._vendor.cachecontrol.adapter import CacheControlAdapter from pip._vendor.cachecontrol.cache import DictCache from pip._vendor.cachecontrol.controller import logger if TYPE_CHECKING: from argparse import Namespace from pip._vendor.cachecontrol.controller import CacheController def setup_logging() -> None: logger.setLevel(logging.DEBUG) handler = logging.StreamHandler() logger.addHandler(handler) def get_session() -> requests.Session: adapter = CacheControlAdapter( DictCache(), cache_etags=True, serializer=None, heuristic=None ) sess = requests.Session() sess.mount("http://", adapter) sess.mount("https://", adapter) sess.cache_controller = adapter.controller # type: ignore[attr-defined] return sess def get_args() -> Namespace: parser = ArgumentParser() parser.add_argument("url", help="The URL to try and cache") return parser.parse_args() def main() -> None: args = get_args() sess = get_session() # Make a request to get a response resp = sess.get(args.url) # Turn on logging setup_logging() # try setting the cache cache_controller: CacheController = ( sess.cache_controller # type: ignore[attr-defined] ) cache_controller.cache_response(resp.request, resp.raw) # Now try to get it if cache_controller.cached_request(resp.request): print("Cached!") else: print("Not cached :(") if __name__ == "__main__": main()	1.7 KB	2026-01-20 12:58
📄 adapter.py # SPDX-FileCopyrightText: 2015 Eric Larson # # SPDX-License-Identifier: Apache-2.0 from __future__ import annotations import functools import types import weakref import zlib from typing import TYPE_CHECKING, Any, Collection, Mapping from pip._vendor.requests.adapters import HTTPAdapter from pip._vendor.cachecontrol.cache import DictCache from pip._vendor.cachecontrol.controller import PERMANENT_REDIRECT_STATUSES, CacheController from pip._vendor.cachecontrol.filewrapper import CallbackFileWrapper if TYPE_CHECKING: from pip._vendor.requests import PreparedRequest, Response from pip._vendor.urllib3 import HTTPResponse from pip._vendor.cachecontrol.cache import BaseCache from pip._vendor.cachecontrol.heuristics import BaseHeuristic from pip._vendor.cachecontrol.serialize import Serializer class CacheControlAdapter(HTTPAdapter): invalidating_methods = {"PUT", "PATCH", "DELETE"} def __init__( self, cache: BaseCache \| None = None, cache_etags: bool = True, controller_class: type[CacheController] \| None = None, serializer: Serializer \| None = None, heuristic: BaseHeuristic \| None = None, cacheable_methods: Collection[str] \| None = None, args: Any, kw: Any, ) -> None: super().__init__(args, **kw) self.cache = DictCache() if cache is None else cache self.heuristic = heuristic self.cacheable_methods = cacheable_methods or ("GET",) controller_factory = controller_class or CacheController self.controller = controller_factory( self.cache, cache_etags=cache_etags, serializer=serializer ) def send( self, request: PreparedRequest, stream: bool = False, timeout: None \| float \| tuple[float, float] \| tuple[float, None] = None, verify: bool \| str = True, cert: (None \| bytes \| str \| tuple[bytes \| str, bytes \| str]) = None, proxies: Mapping[str, str] \| None = None, cacheable_methods: Collection[str] \| None = None, ) -> Response: """ Send a request. Use the request information to see if it exists in the cache and cache the response if we need to and can. """ cacheable = cacheable_methods or self.cacheable_methods if request.method in cacheable: try: cached_response = self.controller.cached_request(request) except zlib.error: cached_response = None if cached_response: return self.build_response(request, cached_response, from_cache=True) # check for etags and add headers if appropriate request.headers.update(self.controller.conditional_headers(request)) resp = super().send(request, stream, timeout, verify, cert, proxies) return resp def build_response( # type: ignore[override] self, request: PreparedRequest, response: HTTPResponse, from_cache: bool = False, cacheable_methods: Collection[str] \| None = None, ) -> Response: """ Build a response by making a request or using the cache. This will end up calling send and returning a potentially cached response """ cacheable = cacheable_methods or self.cacheable_methods if not from_cache and request.method in cacheable: # Check for any heuristics that might update headers # before trying to cache. if self.heuristic: response = self.heuristic.apply(response) # apply any expiration heuristics if response.status == 304: # We must have sent an ETag request. This could mean # that we've been expired already or that we simply # have an etag. In either case, we want to try and # update the cache if that is the case. cached_response = self.controller.update_cached_response( request, response ) if cached_response is not response: from_cache = True # We are done with the server response, read a # possible response body (compliant servers will # not return one, but we cannot be 100% sure) and # release the connection back to the pool. response.read(decode_content=False) response.release_conn() response = cached_response # We always cache the 301 responses elif int(response.status) in PERMANENT_REDIRECT_STATUSES: self.controller.cache_response(request, response) else: # Wrap the response file with a wrapper that will cache the # response when the stream has been consumed. response._fp = CallbackFileWrapper( # type: ignore[assignment] response._fp, # type: ignore[arg-type] functools.partial( self.controller.cache_response, request, weakref.ref(response) ), ) if response.chunked: super_update_chunk_length = response.__class__._update_chunk_length def _update_chunk_length( weak_self: weakref.ReferenceType[HTTPResponse], ) -> None: self = weak_self() if self is None: return super_update_chunk_length(self) if self.chunk_left == 0: self._fp._close() # type: ignore[union-attr] response._update_chunk_length = functools.partial( # type: ignore[method-assign] _update_chunk_length, weakref.ref(response) ) resp: Response = super().build_response(request, response) # See if we should invalidate the cache. if request.method in self.invalidating_methods and resp.ok: assert request.url is not None cache_url = self.controller.cache_url(request.url) self.cache.delete(cache_url) # Give the request a from_cache attr to let people use it resp.from_cache = from_cache # type: ignore[attr-defined] return resp def close(self) -> None: self.cache.close() super().close() # type: ignore[no-untyped-call]	6.44 KB	2026-01-20 12:58
📄 cache.py # SPDX-FileCopyrightText: 2015 Eric Larson # # SPDX-License-Identifier: Apache-2.0 """ The cache object API for implementing caches. The default is a thread safe in-memory dictionary. """ from __future__ import annotations from threading import Lock from typing import IO, TYPE_CHECKING, MutableMapping if TYPE_CHECKING: from datetime import datetime class BaseCache: def get(self, key: str) -> bytes \| None: raise NotImplementedError() def set( self, key: str, value: bytes, expires: int \| datetime \| None = None ) -> None: raise NotImplementedError() def delete(self, key: str) -> None: raise NotImplementedError() def close(self) -> None: pass class DictCache(BaseCache): def __init__(self, init_dict: MutableMapping[str, bytes] \| None = None) -> None: self.lock = Lock() self.data = init_dict or {} def get(self, key: str) -> bytes \| None: return self.data.get(key, None) def set( self, key: str, value: bytes, expires: int \| datetime \| None = None ) -> None: with self.lock: self.data.update({key: value}) def delete(self, key: str) -> None: with self.lock: if key in self.data: self.data.pop(key) class SeparateBodyBaseCache(BaseCache): """ In this variant, the body is not stored mixed in with the metadata, but is passed in (as a bytes-like object) in a separate call to ``set_body()``. That is, the expected interaction pattern is:: cache.set(key, serialized_metadata) cache.set_body(key) Similarly, the body should be loaded separately via ``get_body()``. """ def set_body(self, key: str, body: bytes) -> None: raise NotImplementedError() def get_body(self, key: str) -> IO[bytes] \| None: """ Return the body as file-like object. """ raise NotImplementedError()	1.91 KB	2026-01-20 12:58
📁 caches	-	2026-03-21 15:45
📄 controller.py # SPDX-FileCopyrightText: 2015 Eric Larson # # SPDX-License-Identifier: Apache-2.0 """ The httplib2 algorithms ported for use with requests. """ from __future__ import annotations import calendar import logging import re import time import weakref from email.utils import parsedate_tz from typing import TYPE_CHECKING, Collection, Mapping from pip._vendor.requests.structures import CaseInsensitiveDict from pip._vendor.cachecontrol.cache import DictCache, SeparateBodyBaseCache from pip._vendor.cachecontrol.serialize import Serializer if TYPE_CHECKING: from typing import Literal from pip._vendor.requests import PreparedRequest from pip._vendor.urllib3 import HTTPResponse from pip._vendor.cachecontrol.cache import BaseCache logger = logging.getLogger(__name__) URI = re.compile(r"^(([^:/?#]+):)?(//([^/?#]))?([^?#])(\?([^#]))?(#(.))?") PERMANENT_REDIRECT_STATUSES = (301, 308) def parse_uri(uri: str) -> tuple[str, str, str, str, str]: """Parses a URI using the regex given in Appendix B of RFC 3986. (scheme, authority, path, query, fragment) = parse_uri(uri) """ match = URI.match(uri) assert match is not None groups = match.groups() return (groups[1], groups[3], groups[4], groups[6], groups[8]) class CacheController: """An interface to see if request should cached or not.""" def __init__( self, cache: BaseCache \| None = None, cache_etags: bool = True, serializer: Serializer \| None = None, status_codes: Collection[int] \| None = None, ): self.cache = DictCache() if cache is None else cache self.cache_etags = cache_etags self.serializer = serializer or Serializer() self.cacheable_status_codes = status_codes or (200, 203, 300, 301, 308) @classmethod def _urlnorm(cls, uri: str) -> str: """Normalize the URL to create a safe key for the cache""" (scheme, authority, path, query, fragment) = parse_uri(uri) if not scheme or not authority: raise Exception("Only absolute URIs are allowed. uri = %s" % uri) scheme = scheme.lower() authority = authority.lower() if not path: path = "/" # Could do syntax based normalization of the URI before # computing the digest. See Section 6.2.2 of Std 66. request_uri = query and "?".join([path, query]) or path defrag_uri = scheme + "://" + authority + request_uri return defrag_uri @classmethod def cache_url(cls, uri: str) -> str: return cls._urlnorm(uri) def parse_cache_control(self, headers: Mapping[str, str]) -> dict[str, int \| None]: known_directives = { # https://tools.ietf.org/html/rfc7234#section-5.2 "max-age": (int, True), "max-stale": (int, False), "min-fresh": (int, True), "no-cache": (None, False), "no-store": (None, False), "no-transform": (None, False), "only-if-cached": (None, False), "must-revalidate": (None, False), "public": (None, False), "private": (None, False), "proxy-revalidate": (None, False), "s-maxage": (int, True), } cc_headers = headers.get("cache-control", headers.get("Cache-Control", "")) retval: dict[str, int \| None] = {} for cc_directive in cc_headers.split(","): if not cc_directive.strip(): continue parts = cc_directive.split("=", 1) directive = parts[0].strip() try: typ, required = known_directives[directive] except KeyError: logger.debug("Ignoring unknown cache-control directive: %s", directive) continue if not typ or not required: retval[directive] = None if typ: try: retval[directive] = typ(parts[1].strip()) except IndexError: if required: logger.debug( "Missing value for cache-control " "directive: %s", directive, ) except ValueError: logger.debug( "Invalid value for cache-control directive " "%s, must be %s", directive, typ.__name__, ) return retval def _load_from_cache(self, request: PreparedRequest) -> HTTPResponse \| None: """ Load a cached response, or return None if it's not available. """ # We do not support caching of partial content: so if the request contains a # Range header then we don't want to load anything from the cache. if "Range" in request.headers: return None cache_url = request.url assert cache_url is not None cache_data = self.cache.get(cache_url) if cache_data is None: logger.debug("No cache entry available") return None if isinstance(self.cache, SeparateBodyBaseCache): body_file = self.cache.get_body(cache_url) else: body_file = None result = self.serializer.loads(request, cache_data, body_file) if result is None: logger.warning("Cache entry deserialization failed, entry ignored") return result def cached_request(self, request: PreparedRequest) -> HTTPResponse \| Literal[False]: """ Return a cached response if it exists in the cache, otherwise return False. """ assert request.url is not None cache_url = self.cache_url(request.url) logger.debug('Looking up "%s" in the cache', cache_url) cc = self.parse_cache_control(request.headers) # Bail out if the request insists on fresh data if "no-cache" in cc: logger.debug('Request header has "no-cache", cache bypassed') return False if "max-age" in cc and cc["max-age"] == 0: logger.debug('Request header has "max_age" as 0, cache bypassed') return False # Check whether we can load the response from the cache: resp = self._load_from_cache(request) if not resp: return False # If we have a cached permanent redirect, return it immediately. We # don't need to test our response for other headers b/c it is # intrinsically "cacheable" as it is Permanent. # # See: # https://tools.ietf.org/html/rfc7231#section-6.4.2 # # Client can try to refresh the value by repeating the request # with cache busting headers as usual (ie no-cache). if int(resp.status) in PERMANENT_REDIRECT_STATUSES: msg = ( "Returning cached permanent redirect response " "(ignoring date and etag information)" ) logger.debug(msg) return resp headers: CaseInsensitiveDict[str] = CaseInsensitiveDict(resp.headers) if not headers or "date" not in headers: if "etag" not in headers: # Without date or etag, the cached response can never be used # and should be deleted. logger.debug("Purging cached response: no date or etag") self.cache.delete(cache_url) logger.debug("Ignoring cached response: no date") return False now = time.time() time_tuple = parsedate_tz(headers["date"]) assert time_tuple is not None date = calendar.timegm(time_tuple[:6]) current_age = max(0, now - date) logger.debug("Current age based on date: %i", current_age) # TODO: There is an assumption that the result will be a # urllib3 response object. This may not be best since we # could probably avoid instantiating or constructing the # response until we know we need it. resp_cc = self.parse_cache_control(headers) # determine freshness freshness_lifetime = 0 # Check the max-age pragma in the cache control header max_age = resp_cc.get("max-age") if max_age is not None: freshness_lifetime = max_age logger.debug("Freshness lifetime from max-age: %i", freshness_lifetime) # If there isn't a max-age, check for an expires header elif "expires" in headers: expires = parsedate_tz(headers["expires"]) if expires is not None: expire_time = calendar.timegm(expires[:6]) - date freshness_lifetime = max(0, expire_time) logger.debug("Freshness lifetime from expires: %i", freshness_lifetime) # Determine if we are setting freshness limit in the # request. Note, this overrides what was in the response. max_age = cc.get("max-age") if max_age is not None: freshness_lifetime = max_age logger.debug( "Freshness lifetime from request max-age: %i", freshness_lifetime ) min_fresh = cc.get("min-fresh") if min_fresh is not None: # adjust our current age by our min fresh current_age += min_fresh logger.debug("Adjusted current age from min-fresh: %i", current_age) # Return entry if it is fresh enough if freshness_lifetime > current_age: logger.debug('The response is "fresh", returning cached response') logger.debug("%i > %i", freshness_lifetime, current_age) return resp # we're not fresh. If we don't have an Etag, clear it out if "etag" not in headers: logger.debug('The cached response is "stale" with no etag, purging') self.cache.delete(cache_url) # return the original handler return False def conditional_headers(self, request: PreparedRequest) -> dict[str, str]: resp = self._load_from_cache(request) new_headers = {} if resp: headers: CaseInsensitiveDict[str] = CaseInsensitiveDict(resp.headers) if "etag" in headers: new_headers["If-None-Match"] = headers["ETag"] if "last-modified" in headers: new_headers["If-Modified-Since"] = headers["Last-Modified"] return new_headers def _cache_set( self, cache_url: str, request: PreparedRequest, response: HTTPResponse, body: bytes \| None = None, expires_time: int \| None = None, ) -> None: """ Store the data in the cache. """ if isinstance(self.cache, SeparateBodyBaseCache): # We pass in the body separately; just put a placeholder empty # string in the metadata. self.cache.set( cache_url, self.serializer.dumps(request, response, b""), expires=expires_time, ) # body is None can happen when, for example, we're only updating # headers, as is the case in update_cached_response(). if body is not None: self.cache.set_body(cache_url, body) else: self.cache.set( cache_url, self.serializer.dumps(request, response, body), expires=expires_time, ) def cache_response( self, request: PreparedRequest, response_or_ref: HTTPResponse \| weakref.ReferenceType[HTTPResponse], body: bytes \| None = None, status_codes: Collection[int] \| None = None, ) -> None: """ Algorithm for caching requests. This assumes a requests Response object. """ if isinstance(response_or_ref, weakref.ReferenceType): response = response_or_ref() if response is None: # The weakref can be None only in case the user used streamed request # and did not consume or close it, and holds no reference to requests.Response. # In such case, we don't want to cache the response. return else: response = response_or_ref # From httplib2: Don't cache 206's since we aren't going to # handle byte range requests cacheable_status_codes = status_codes or self.cacheable_status_codes if response.status not in cacheable_status_codes: logger.debug( "Status code %s not in %s", response.status, cacheable_status_codes ) return response_headers: CaseInsensitiveDict[str] = CaseInsensitiveDict( response.headers ) if "date" in response_headers: time_tuple = parsedate_tz(response_headers["date"]) assert time_tuple is not None date = calendar.timegm(time_tuple[:6]) else: date = 0 # If we've been given a body, our response has a Content-Length, that # Content-Length is valid then we can check to see if the body we've # been given matches the expected size, and if it doesn't we'll just # skip trying to cache it. if ( body is not None and "content-length" in response_headers and response_headers["content-length"].isdigit() and int(response_headers["content-length"]) != len(body) ): return cc_req = self.parse_cache_control(request.headers) cc = self.parse_cache_control(response_headers) assert request.url is not None cache_url = self.cache_url(request.url) logger.debug('Updating cache with response from "%s"', cache_url) # Delete it from the cache if we happen to have it stored there no_store = False if "no-store" in cc: no_store = True logger.debug('Response header has "no-store"') if "no-store" in cc_req: no_store = True logger.debug('Request header has "no-store"') if no_store and self.cache.get(cache_url): logger.debug('Purging existing cache entry to honor "no-store"') self.cache.delete(cache_url) if no_store: return # https://tools.ietf.org/html/rfc7234#section-4.1: # A Vary header field-value of "" always fails to match. # Storing such a response leads to a deserialization warning # during cache lookup and is not allowed to ever be served, # so storing it can be avoided. if "" in response_headers.get("vary", ""): logger.debug('Response header has "Vary: "') return # If we've been given an etag, then keep the response if self.cache_etags and "etag" in response_headers: expires_time = 0 if response_headers.get("expires"): expires = parsedate_tz(response_headers["expires"]) if expires is not None: expires_time = calendar.timegm(expires[:6]) - date expires_time = max(expires_time, 14 86400) logger.debug(f"etag object cached for {expires_time} seconds") logger.debug("Caching due to etag") self._cache_set(cache_url, request, response, body, expires_time) # Add to the cache any permanent redirects. We do this before looking # that the Date headers. elif int(response.status) in PERMANENT_REDIRECT_STATUSES: logger.debug("Caching permanent redirect") self._cache_set(cache_url, request, response, b"") # Add to the cache if the response headers demand it. If there # is no date header then we can't do anything about expiring # the cache. elif "date" in response_headers: time_tuple = parsedate_tz(response_headers["date"]) assert time_tuple is not None date = calendar.timegm(time_tuple[:6]) # cache when there is a max-age > 0 max_age = cc.get("max-age") if max_age is not None and max_age > 0: logger.debug("Caching b/c date exists and max-age > 0") expires_time = max_age self._cache_set( cache_url, request, response, body, expires_time, ) # If the request can expire, it means we should cache it # in the meantime. elif "expires" in response_headers: if response_headers["expires"]: expires = parsedate_tz(response_headers["expires"]) if expires is not None: expires_time = calendar.timegm(expires[:6]) - date else: expires_time = None logger.debug( "Caching b/c of expires header. expires in {} seconds".format( expires_time ) ) self._cache_set( cache_url, request, response, body, expires_time, ) def update_cached_response( self, request: PreparedRequest, response: HTTPResponse ) -> HTTPResponse: """On a 304 we will get a new set of headers that we want to update our cached value with, assuming we have one. This should only ever be called when we've sent an ETag and gotten a 304 as the response. """ assert request.url is not None cache_url = self.cache_url(request.url) cached_response = self._load_from_cache(request) if not cached_response: # we didn't have a cached response return response # Lets update our headers with the headers from the new request: # http://tools.ietf.org/html/draft-ietf-httpbis-p4-conditional-26#section-4.1 # # The server isn't supposed to send headers that would make # the cached body invalid. But... just in case, we'll be sure # to strip out ones we know that might be problmatic due to # typical assumptions. excluded_headers = ["content-length"] cached_response.headers.update( { k: v for k, v in response.headers.items() if k.lower() not in excluded_headers } ) # we want a 200 b/c we have content via the cache cached_response.status = 200 # update our cache self._cache_set(cache_url, request, cached_response) return cached_response	18.65 KB	2026-01-20 12:58
📄 filewrapper.py # SPDX-FileCopyrightText: 2015 Eric Larson # # SPDX-License-Identifier: Apache-2.0 from __future__ import annotations import mmap from tempfile import NamedTemporaryFile from typing import TYPE_CHECKING, Any, Callable if TYPE_CHECKING: from http.client import HTTPResponse class CallbackFileWrapper: """ Small wrapper around a fp object which will tee everything read into a buffer, and when that file is closed it will execute a callback with the contents of that buffer. All attributes are proxied to the underlying file object. This class uses members with a double underscore (__) leading prefix so as not to accidentally shadow an attribute. The data is stored in a temporary file until it is all available. As long as the temporary files directory is disk-based (sometimes it's a memory-backed-``tmpfs`` on Linux), data will be unloaded to disk if memory pressure is high. For small files the disk usually won't be used at all, it'll all be in the filesystem memory cache, so there should be no performance impact. """ def __init__( self, fp: HTTPResponse, callback: Callable[[bytes], None] \| None ) -> None: self.__buf = NamedTemporaryFile("rb+", delete=True) self.__fp = fp self.__callback = callback def __getattr__(self, name: str) -> Any: # The vagaries of garbage collection means that self.__fp is # not always set. By using __getattribute__ and the private # name[0] allows looking up the attribute value and raising an # AttributeError when it doesn't exist. This stop things from # infinitely recursing calls to getattr in the case where # self.__fp hasn't been set. # # [0] https://docs.python.org/2/reference/expressions.html#atom-identifiers fp = self.__getattribute__("_CallbackFileWrapper__fp") return getattr(fp, name) def __is_fp_closed(self) -> bool: try: return self.__fp.fp is None except AttributeError: pass try: closed: bool = self.__fp.closed return closed except AttributeError: pass # We just don't cache it then. # TODO: Add some logging here... return False def _close(self) -> None: if self.__callback: if self.__buf.tell() == 0: # Empty file: result = b"" else: # Return the data without actually loading it into memory, # relying on Python's buffer API and mmap(). mmap() just gives # a view directly into the filesystem's memory cache, so it # doesn't result in duplicate memory use. self.__buf.seek(0, 0) result = memoryview( mmap.mmap(self.__buf.fileno(), 0, access=mmap.ACCESS_READ) ) self.__callback(result) # We assign this to None here, because otherwise we can get into # really tricky problems where the CPython interpreter dead locks # because the callback is holding a reference to something which # has a __del__ method. Setting this to None breaks the cycle # and allows the garbage collector to do it's thing normally. self.__callback = None # Closing the temporary file releases memory and frees disk space. # Important when caching big files. self.__buf.close() def read(self, amt: int \| None = None) -> bytes: data: bytes = self.__fp.read(amt) if data: # We may be dealing with b'', a sign that things are over: # it's passed e.g. after we've already closed self.__buf. self.__buf.write(data) if self.__is_fp_closed(): self._close() return data def _safe_read(self, amt: int) -> bytes: data: bytes = self.__fp._safe_read(amt) # type: ignore[attr-defined] if amt == 2 and data == b"\r\n": # urllib executes this read to toss the CRLF at the end # of the chunk. return data self.__buf.write(data) if self.__is_fp_closed(): self._close() return data	4.19 KB	2026-01-20 12:58
📄 heuristics.py # SPDX-FileCopyrightText: 2015 Eric Larson # # SPDX-License-Identifier: Apache-2.0 from __future__ import annotations import calendar import time from datetime import datetime, timedelta, timezone from email.utils import formatdate, parsedate, parsedate_tz from typing import TYPE_CHECKING, Any, Mapping if TYPE_CHECKING: from pip._vendor.urllib3 import HTTPResponse TIME_FMT = "%a, %d %b %Y %H:%M:%S GMT" def expire_after(delta: timedelta, date: datetime \| None = None) -> datetime: date = date or datetime.now(timezone.utc) return date + delta def datetime_to_header(dt: datetime) -> str: return formatdate(calendar.timegm(dt.timetuple())) class BaseHeuristic: def warning(self, response: HTTPResponse) -> str \| None: """ Return a valid 1xx warning header value describing the cache adjustments. The response is provided too allow warnings like 113 http://tools.ietf.org/html/rfc7234#section-5.5.4 where we need to explicitly say response is over 24 hours old. """ return '110 - "Response is Stale"' def update_headers(self, response: HTTPResponse) -> dict[str, str]: """Update the response headers with any new headers. NOTE: This SHOULD always include some Warning header to signify that the response was cached by the client, not by way of the provided headers. """ return {} def apply(self, response: HTTPResponse) -> HTTPResponse: updated_headers = self.update_headers(response) if updated_headers: response.headers.update(updated_headers) warning_header_value = self.warning(response) if warning_header_value is not None: response.headers.update({"Warning": warning_header_value}) return response class OneDayCache(BaseHeuristic): """ Cache the response by providing an expires 1 day in the future. """ def update_headers(self, response: HTTPResponse) -> dict[str, str]: headers = {} if "expires" not in response.headers: date = parsedate(response.headers["date"]) expires = expire_after( timedelta(days=1), date=datetime(date[:6], tzinfo=timezone.utc), # type: ignore[index,misc] ) headers["expires"] = datetime_to_header(expires) headers["cache-control"] = "public" return headers class ExpiresAfter(BaseHeuristic): """ Cache all* requests for a defined time period. """ def __init__(self, kw: Any) -> None: self.delta = timedelta(kw) def update_headers(self, response: HTTPResponse) -> dict[str, str]: expires = expire_after(self.delta) return {"expires": datetime_to_header(expires), "cache-control": "public"} def warning(self, response: HTTPResponse) -> str \| None: tmpl = "110 - Automatically cached for %s. Response might be stale" return tmpl % self.delta class LastModified(BaseHeuristic): """ If there is no Expires header already, fall back on Last-Modified using the heuristic from http://tools.ietf.org/html/rfc7234#section-4.2.2 to calculate a reasonable value. Firefox also does something like this per https://developer.mozilla.org/en-US/docs/Web/HTTP/Caching_FAQ http://lxr.mozilla.org/mozilla-release/source/netwerk/protocol/http/nsHttpResponseHead.cpp#397 Unlike mozilla we limit this to 24-hr. """ cacheable_by_default_statuses = { 200, 203, 204, 206, 300, 301, 404, 405, 410, 414, 501, } def update_headers(self, resp: HTTPResponse) -> dict[str, str]: headers: Mapping[str, str] = resp.headers if "expires" in headers: return {} if "cache-control" in headers and headers["cache-control"] != "public": return {} if resp.status not in self.cacheable_by_default_statuses: return {} if "date" not in headers or "last-modified" not in headers: return {} time_tuple = parsedate_tz(headers["date"]) assert time_tuple is not None date = calendar.timegm(time_tuple[:6]) last_modified = parsedate(headers["last-modified"]) if last_modified is None: return {} now = time.time() current_age = max(0, now - date) delta = date - calendar.timegm(last_modified) freshness_lifetime = max(0, min(delta / 10, 24 * 3600)) if freshness_lifetime <= current_age: return {} expires = date + freshness_lifetime return {"expires": time.strftime(TIME_FMT, time.gmtime(expires))} def warning(self, resp: HTTPResponse) -> str \| None: return None	4.77 KB	2026-01-20 12:58
📄 py.typed	0 B	2026-01-20 12:58
📄 serialize.py # SPDX-FileCopyrightText: 2015 Eric Larson # # SPDX-License-Identifier: Apache-2.0 from __future__ import annotations import io from typing import IO, TYPE_CHECKING, Any, Mapping, cast from pip._vendor import msgpack from pip._vendor.requests.structures import CaseInsensitiveDict from pip._vendor.urllib3 import HTTPResponse if TYPE_CHECKING: from pip._vendor.requests import PreparedRequest class Serializer: serde_version = "4" def dumps( self, request: PreparedRequest, response: HTTPResponse, body: bytes \| None = None, ) -> bytes: response_headers: CaseInsensitiveDict[str] = CaseInsensitiveDict( response.headers ) if body is None: # When a body isn't passed in, we'll read the response. We # also update the response with a new file handler to be # sure it acts as though it was never read. body = response.read(decode_content=False) response._fp = io.BytesIO(body) # type: ignore[assignment] response.length_remaining = len(body) data = { "response": { "body": body, # Empty bytestring if body is stored separately "headers": {str(k): str(v) for k, v in response.headers.items()}, "status": response.status, "version": response.version, "reason": str(response.reason), "decode_content": response.decode_content, } } # Construct our vary headers data["vary"] = {} if "vary" in response_headers: varied_headers = response_headers["vary"].split(",") for header in varied_headers: header = str(header).strip() header_value = request.headers.get(header, None) if header_value is not None: header_value = str(header_value) data["vary"][header] = header_value return b",".join([f"cc={self.serde_version}".encode(), self.serialize(data)]) def serialize(self, data: dict[str, Any]) -> bytes: return cast(bytes, msgpack.dumps(data, use_bin_type=True)) def loads( self, request: PreparedRequest, data: bytes, body_file: IO[bytes] \| None = None, ) -> HTTPResponse \| None: # Short circuit if we've been given an empty set of data if not data: return None # Previous versions of this library supported other serialization # formats, but these have all been removed. if not data.startswith(f"cc={self.serde_version},".encode()): return None data = data[5:] return self._loads_v4(request, data, body_file) def prepare_response( self, request: PreparedRequest, cached: Mapping[str, Any], body_file: IO[bytes] \| None = None, ) -> HTTPResponse \| None: """Verify our vary headers match and construct a real urllib3 HTTPResponse object. """ # Special case the '' Vary value as it means we cannot actually # determine if the cached response is suitable for this request. # This case is also handled in the controller code when creating # a cache entry, but is left here for backwards compatibility. if "" in cached.get("vary", {}): return None # Ensure that the Vary headers for the cached response match our # request for header, value in cached.get("vary", {}).items(): if request.headers.get(header, None) != value: return None body_raw = cached["response"].pop("body") headers: CaseInsensitiveDict[str] = CaseInsensitiveDict( data=cached["response"]["headers"] ) if headers.get("transfer-encoding", "") == "chunked": headers.pop("transfer-encoding") cached["response"]["headers"] = headers try: body: IO[bytes] if body_file is None: body = io.BytesIO(body_raw) else: body = body_file except TypeError: # This can happen if cachecontrol serialized to v1 format (pickle) # using Python 2. A Python 2 str(byte string) will be unpickled as # a Python 3 str (unicode string), which will cause the above to # fail with: # # TypeError: 'str' does not support the buffer interface body = io.BytesIO(body_raw.encode("utf8")) # Discard any `strict` parameter serialized by older version of cachecontrol. cached["response"].pop("strict", None) return HTTPResponse(body=body, preload_content=False, **cached["response"]) def _loads_v4( self, request: PreparedRequest, data: bytes, body_file: IO[bytes] \| None = None, ) -> HTTPResponse \| None: try: cached = msgpack.loads(data, raw=False) except ValueError: return None return self.prepare_response(request, cached, body_file)	5.04 KB	2026-01-20 12:58
📄 wrapper.py # SPDX-FileCopyrightText: 2015 Eric Larson # # SPDX-License-Identifier: Apache-2.0 from __future__ import annotations from typing import TYPE_CHECKING, Collection from pip._vendor.cachecontrol.adapter import CacheControlAdapter from pip._vendor.cachecontrol.cache import DictCache if TYPE_CHECKING: from pip._vendor import requests from pip._vendor.cachecontrol.cache import BaseCache from pip._vendor.cachecontrol.controller import CacheController from pip._vendor.cachecontrol.heuristics import BaseHeuristic from pip._vendor.cachecontrol.serialize import Serializer def CacheControl( sess: requests.Session, cache: BaseCache \| None = None, cache_etags: bool = True, serializer: Serializer \| None = None, heuristic: BaseHeuristic \| None = None, controller_class: type[CacheController] \| None = None, adapter_class: type[CacheControlAdapter] \| None = None, cacheable_methods: Collection[str] \| None = None, ) -> requests.Session: cache = DictCache() if cache is None else cache adapter_class = adapter_class or CacheControlAdapter adapter = adapter_class( cache, cache_etags=cache_etags, serializer=serializer, heuristic=heuristic, controller_class=controller_class, cacheable_methods=cacheable_methods, ) sess.mount("http://", adapter) sess.mount("https://", adapter) return sess	1.38 KB	2026-01-20 12:58

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