Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/cachecontrol/adapter.py @ 0:d30785e31577 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:18:57 -0400
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1 import types
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2 import functools
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3
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4 from requests.adapters import HTTPAdapter
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5
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6 from .controller import CacheController
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7 from .cache import DictCache
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8 from .filewrapper import CallbackFileWrapper
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9
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10
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11 class CacheControlAdapter(HTTPAdapter):
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12 invalidating_methods = set(['PUT', 'DELETE'])
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13
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14 def __init__(self, cache=None,
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15 cache_etags=True,
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16 controller_class=None,
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17 serializer=None,
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18 heuristic=None,
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19 *args, **kw):
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20 super(CacheControlAdapter, self).__init__(*args, **kw)
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21 self.cache = cache or DictCache()
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22 self.heuristic = heuristic
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23
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24 controller_factory = controller_class or CacheController
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25 self.controller = controller_factory(
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26 self.cache,
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27 cache_etags=cache_etags,
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28 serializer=serializer,
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29 )
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30
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31 def send(self, request, **kw):
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32 """
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33 Send a request. Use the request information to see if it
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34 exists in the cache and cache the response if we need to and can.
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35 """
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36 if request.method == 'GET':
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37 cached_response = self.controller.cached_request(request)
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38 if cached_response:
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39 return self.build_response(request, cached_response,
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40 from_cache=True)
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41
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42 # check for etags and add headers if appropriate
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43 request.headers.update(
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44 self.controller.conditional_headers(request)
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45 )
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46
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47 resp = super(CacheControlAdapter, self).send(request, **kw)
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48
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49 return resp
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50
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51 def build_response(self, request, response, from_cache=False):
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52 """
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53 Build a response by making a request or using the cache.
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54
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55 This will end up calling send and returning a potentially
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56 cached response
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57 """
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58 if not from_cache and request.method == 'GET':
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59 # Check for any heuristics that might update headers
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60 # before trying to cache.
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61 if self.heuristic:
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62 response = self.heuristic.apply(response)
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63
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64 # apply any expiration heuristics
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65 if response.status == 304:
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66 # We must have sent an ETag request. This could mean
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67 # that we've been expired already or that we simply
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68 # have an etag. In either case, we want to try and
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69 # update the cache if that is the case.
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70 cached_response = self.controller.update_cached_response(
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71 request, response
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72 )
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73
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74 if cached_response is not response:
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75 from_cache = True
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76
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77 # We are done with the server response, read a
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78 # possible response body (compliant servers will
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79 # not return one, but we cannot be 100% sure) and
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80 # release the connection back to the pool.
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81 response.read(decode_content=False)
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82 response.release_conn()
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83
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84 response = cached_response
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85
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86 # We always cache the 301 responses
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87 elif response.status == 301:
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88 self.controller.cache_response(request, response)
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89 else:
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90 # Wrap the response file with a wrapper that will cache the
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91 # response when the stream has been consumed.
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92 response._fp = CallbackFileWrapper(
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93 response._fp,
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94 functools.partial(
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95 self.controller.cache_response,
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96 request,
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97 response,
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98 )
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99 )
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100 if response.chunked:
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101 super_update_chunk_length = response._update_chunk_length
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102
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103 def _update_chunk_length(self):
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104 super_update_chunk_length()
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105 if self.chunk_left == 0:
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106 self._fp._close()
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107 response._update_chunk_length = types.MethodType(_update_chunk_length, response)
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108
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109 resp = super(CacheControlAdapter, self).build_response(
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110 request, response
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111 )
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112
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113 # See if we should invalidate the cache.
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114 if request.method in self.invalidating_methods and resp.ok:
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115 cache_url = self.controller.cache_url(request.url)
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116 self.cache.delete(cache_url)
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117
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118 # Give the request a from_cache attr to let people use it
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119 resp.from_cache = from_cache
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120
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121 return resp
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122
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123 def close(self):
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124 self.cache.close()
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125 super(CacheControlAdapter, self).close()