Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/pip/_vendor/cachecontrol/adapter.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 import types |
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2 import functools |
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3 import zlib |
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4 |
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5 from pip._vendor.requests.adapters import HTTPAdapter |
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6 |
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7 from .controller import CacheController |
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8 from .cache import DictCache |
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9 from .filewrapper import CallbackFileWrapper |
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10 |
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11 |
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12 class CacheControlAdapter(HTTPAdapter): |
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13 invalidating_methods = {"PUT", "DELETE"} |
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14 |
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15 def __init__( |
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16 self, |
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17 cache=None, |
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18 cache_etags=True, |
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19 controller_class=None, |
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20 serializer=None, |
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21 heuristic=None, |
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22 cacheable_methods=None, |
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23 *args, |
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24 **kw |
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25 ): |
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26 super(CacheControlAdapter, self).__init__(*args, **kw) |
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27 self.cache = DictCache() if cache is None else cache |
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28 self.heuristic = heuristic |
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29 self.cacheable_methods = cacheable_methods or ("GET",) |
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30 |
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31 controller_factory = controller_class or CacheController |
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32 self.controller = controller_factory( |
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33 self.cache, cache_etags=cache_etags, serializer=serializer |
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34 ) |
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35 |
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36 def send(self, request, cacheable_methods=None, **kw): |
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37 """ |
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38 Send a request. Use the request information to see if it |
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39 exists in the cache and cache the response if we need to and can. |
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40 """ |
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41 cacheable = cacheable_methods or self.cacheable_methods |
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42 if request.method in cacheable: |
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43 try: |
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44 cached_response = self.controller.cached_request(request) |
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45 except zlib.error: |
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46 cached_response = None |
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47 if cached_response: |
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48 return self.build_response(request, cached_response, from_cache=True) |
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49 |
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50 # check for etags and add headers if appropriate |
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51 request.headers.update(self.controller.conditional_headers(request)) |
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52 |
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53 resp = super(CacheControlAdapter, self).send(request, **kw) |
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54 |
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55 return resp |
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56 |
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57 def build_response( |
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58 self, request, response, from_cache=False, cacheable_methods=None |
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59 ): |
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60 """ |
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61 Build a response by making a request or using the cache. |
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62 |
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63 This will end up calling send and returning a potentially |
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64 cached response |
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65 """ |
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66 cacheable = cacheable_methods or self.cacheable_methods |
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67 if not from_cache and request.method in cacheable: |
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68 # Check for any heuristics that might update headers |
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69 # before trying to cache. |
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70 if self.heuristic: |
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71 response = self.heuristic.apply(response) |
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72 |
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73 # apply any expiration heuristics |
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74 if response.status == 304: |
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75 # We must have sent an ETag request. This could mean |
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76 # that we've been expired already or that we simply |
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77 # have an etag. In either case, we want to try and |
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78 # update the cache if that is the case. |
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79 cached_response = self.controller.update_cached_response( |
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80 request, response |
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81 ) |
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82 |
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83 if cached_response is not response: |
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84 from_cache = True |
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85 |
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86 # We are done with the server response, read a |
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87 # possible response body (compliant servers will |
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88 # not return one, but we cannot be 100% sure) and |
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89 # release the connection back to the pool. |
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90 response.read(decode_content=False) |
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91 response.release_conn() |
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92 |
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93 response = cached_response |
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94 |
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95 # We always cache the 301 responses |
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96 elif response.status == 301: |
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97 self.controller.cache_response(request, response) |
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98 else: |
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99 # Wrap the response file with a wrapper that will cache the |
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100 # response when the stream has been consumed. |
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101 response._fp = CallbackFileWrapper( |
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102 response._fp, |
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103 functools.partial( |
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104 self.controller.cache_response, request, response |
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105 ), |
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106 ) |
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107 if response.chunked: |
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108 super_update_chunk_length = response._update_chunk_length |
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109 |
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110 def _update_chunk_length(self): |
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111 super_update_chunk_length() |
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112 if self.chunk_left == 0: |
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113 self._fp._close() |
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114 |
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115 response._update_chunk_length = types.MethodType( |
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116 _update_chunk_length, response |
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117 ) |
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118 |
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119 resp = super(CacheControlAdapter, self).build_response(request, response) |
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120 |
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121 # See if we should invalidate the cache. |
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122 if request.method in self.invalidating_methods and resp.ok: |
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123 cache_url = self.controller.cache_url(request.url) |
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124 self.cache.delete(cache_url) |
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125 |
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126 # Give the request a from_cache attr to let people use it |
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127 resp.from_cache = from_cache |
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128 |
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129 return resp |
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130 |
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131 def close(self): |
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132 self.cache.close() |
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133 super(CacheControlAdapter, self).close() |