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Edit File : adapter.py \| Size : 4.75 KB
import types import functools import zlib from pip._vendor.requests.adapters import HTTPAdapter from .controller import CacheController from .cache import DictCache from .filewrapper import CallbackFileWrapper class CacheControlAdapter(HTTPAdapter): invalidating_methods = {"PUT", "DELETE"} def __init__( self, cache=None, cache_etags=True, controller_class=None, serializer=None, heuristic=None, cacheable_methods=None, args, kw ): super(CacheControlAdapter, self).__init__(args, kw) self.cache = cache or DictCache() 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, cacheable_methods=None, 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. """ 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(CacheControlAdapter, self).send(request, **kw) return resp def build_response( self, request, response, from_cache=False, cacheable_methods=None ): """ 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 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() Back

Edit File : adapter.py | Size : 4.75 KB

import types
import functools
import zlib

from pip._vendor.requests.adapters import HTTPAdapter

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

class CacheControlAdapter(HTTPAdapter):
    invalidating_methods = {"PUT", "DELETE"}

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

return resp

def build_response(
        self, request, response, from_cache=False, cacheable_methods=None
    ):
        """
        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 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()

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