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/ lib / python2.7 / site-packages / pip / _vendor / cachecontrol /

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adapter.py

import types
import functools

from pip._vendor.requests.adapters import HTTPAdapter

from .controller import CacheController
from .cache import DictCache
from .filewrapper import CallbackFileWrapper

class CacheControlAdapter(HTTPAdapter):
    invalidating_methods = set(['PUT', 'DELETE'])

def __init__(self, cache=None,
                 cache_etags=True,
                 controller_class=None,
                 serializer=None,
                 heuristic=None,
                 *args, **kw):
        super(CacheControlAdapter, self).__init__(*args, **kw)
        self.cache = cache or DictCache()
        self.heuristic = heuristic

controller_factory = controller_class or CacheController
        self.controller = controller_factory(
            self.cache,
            cache_etags=cache_etags,
            serializer=serializer,
        )

def send(self, request, **kw):
        """
        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.
        """
        if request.method == 'GET':
            cached_response = self.controller.cached_request(request)
            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(CacheControlAdapter, self).send(request, **kw)

return resp

def build_response(self, request, response, from_cache=False):
        """
        Build a response by making a request or using the cache.

This will end up calling send and returning a potentially
        cached response
        """
        if not from_cache and request.method == 'GET':
            # 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 response.status == 301:
                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(
                    response._fp,
                    functools.partial(
                        self.controller.cache_response,
                        request,
                        response,
                    )
                )
                if response.chunked:
                    super_update_chunk_length = response._update_chunk_length

def _update_chunk_length(self):
                        super_update_chunk_length()
                        if self.chunk_left == 0:
                            self._fp._close()
                    response._update_chunk_length = types.MethodType(_update_chunk_length, response)

resp = super(CacheControlAdapter, self).build_response(
            request, response
        )

# See if we should invalidate the cache.
        if request.method in self.invalidating_methods and resp.ok:
            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

return resp

def close(self):
        self.cache.close()
        super(CacheControlAdapter, self).close()

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	drwxr-xr-x	2024-03-03 08:23:47
..	dir	-	root/root	drwxr-xr-x	2024-03-03 08:23:47
caches	dir	-	root/root	drwxr-xr-x	2024-03-03 08:23:47
__init__.py	text/plain	302 B	root/root	-rw-r--r--	2022-04-21 06:08:21
__init__.pyc	application/x-bytecode.python	583 B	root/root	-rw-r--r--	2022-04-21 06:08:34
__init__.pyo	application/x-bytecode.python	583 B	root/root	-rw-r--r--	2022-04-21 06:08:34
_cmd.py	text/plain	1.29 KB	root/root	-rw-r--r--	2022-04-21 06:08:21
_cmd.pyc	application/x-bytecode.python	2.01 KB	root/root	-rw-r--r--	2022-04-21 06:08:34
_cmd.pyo	application/x-bytecode.python	2.01 KB	root/root	-rw-r--r--	2022-04-21 06:08:34
adapter.py	text/x-script.python	4.5 KB	root/root	-rw-r--r--	2022-04-21 06:08:21
adapter.pyc	application/x-bytecode.python	3.44 KB	root/root	-rw-r--r--	2022-04-21 06:08:34
adapter.pyo	application/x-bytecode.python	3.44 KB	root/root	-rw-r--r--	2022-04-21 06:08:34
cache.py	text/plain	790 B	root/root	-rw-r--r--	2022-04-21 06:08:21
cache.pyc	application/x-bytecode.python	2.34 KB	root/root	-rw-r--r--	2022-04-21 06:08:34
cache.pyo	application/x-bytecode.python	2.34 KB	root/root	-rw-r--r--	2022-04-21 06:08:34
compat.py	text/x-script.python	380 B	root/root	-rw-r--r--	2022-04-21 06:08:21
compat.pyc	application/x-bytecode.python	618 B	root/root	-rw-r--r--	2022-04-21 06:08:34
compat.pyo	application/x-bytecode.python	618 B	root/root	-rw-r--r--	2022-04-21 06:08:34
controller.py	text/plain	12.72 KB	root/root	-rw-r--r--	2022-04-21 06:08:21
controller.pyc	application/x-bytecode.python	8.87 KB	root/root	-rw-r--r--	2022-04-21 06:08:34
controller.pyo	application/x-bytecode.python	8.87 KB	root/root	-rw-r--r--	2022-04-21 06:08:34
filewrapper.py	text/x-script.python	2.47 KB	root/root	-rw-r--r--	2022-04-21 06:08:21
filewrapper.pyc	application/x-bytecode.python	2.6 KB	root/root	-rw-r--r--	2022-04-21 06:08:34
filewrapper.pyo	application/x-bytecode.python	2.6 KB	root/root	-rw-r--r--	2022-04-21 06:08:34
heuristics.py	text/x-script.python	4.04 KB	root/root	-rw-r--r--	2022-04-21 06:08:21
heuristics.pyc	application/x-bytecode.python	5.8 KB	root/root	-rw-r--r--	2022-04-21 06:08:34
heuristics.pyo	application/x-bytecode.python	5.8 KB	root/root	-rw-r--r--	2022-04-21 06:08:34
serialize.py	text/x-script.python	6.38 KB	root/root	-rw-r--r--	2022-04-21 06:08:21
serialize.pyc	application/x-bytecode.python	5.95 KB	root/root	-rw-r--r--	2022-04-21 06:08:34
serialize.pyo	application/x-bytecode.python	5.95 KB	root/root	-rw-r--r--	2022-04-21 06:08:34
wrapper.py	text/x-script.python	498 B	root/root	-rw-r--r--	2022-04-21 06:08:21
wrapper.pyc	application/x-bytecode.python	696 B	root/root	-rw-r--r--	2022-04-21 06:08:34
wrapper.pyo	application/x-bytecode.python	696 B	root/root	-rw-r--r--	2022-04-21 06:08:34