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annotate lib/python3.8/site-packages/pip/_vendor/cachecontrol/serialize.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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1 import base64
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2 import io
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3 import json
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4 import zlib
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5
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6 from pip._vendor import msgpack
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7 from pip._vendor.requests.structures import CaseInsensitiveDict
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8
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9 from .compat import HTTPResponse, pickle, text_type
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10
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11
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12 def _b64_decode_bytes(b):
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13 return base64.b64decode(b.encode("ascii"))
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14
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15
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16 def _b64_decode_str(s):
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17 return _b64_decode_bytes(s).decode("utf8")
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18
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19
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20 class Serializer(object):
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21
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22 def dumps(self, request, response, body=None):
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23 response_headers = CaseInsensitiveDict(response.headers)
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24
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25 if body is None:
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26 body = response.read(decode_content=False)
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27
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28 # NOTE: 99% sure this is dead code. I'm only leaving it
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29 # here b/c I don't have a test yet to prove
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30 # it. Basically, before using
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31 # `cachecontrol.filewrapper.CallbackFileWrapper`,
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32 # this made an effort to reset the file handle. The
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33 # `CallbackFileWrapper` short circuits this code by
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34 # setting the body as the content is consumed, the
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35 # result being a `body` argument is *always* passed
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36 # into cache_response, and in turn,
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37 # `Serializer.dump`.
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38 response._fp = io.BytesIO(body)
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39
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40 # NOTE: This is all a bit weird, but it's really important that on
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41 # Python 2.x these objects are unicode and not str, even when
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42 # they contain only ascii. The problem here is that msgpack
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43 # understands the difference between unicode and bytes and we
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44 # have it set to differentiate between them, however Python 2
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45 # doesn't know the difference. Forcing these to unicode will be
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46 # enough to have msgpack know the difference.
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47 data = {
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48 u"response": {
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49 u"body": body,
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50 u"headers": dict(
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51 (text_type(k), text_type(v)) for k, v in response.headers.items()
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52 ),
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53 u"status": response.status,
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54 u"version": response.version,
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55 u"reason": text_type(response.reason),
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56 u"strict": response.strict,
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57 u"decode_content": response.decode_content,
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58 }
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59 }
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60
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61 # Construct our vary headers
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62 data[u"vary"] = {}
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63 if u"vary" in response_headers:
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64 varied_headers = response_headers[u"vary"].split(",")
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65 for header in varied_headers:
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66 header = text_type(header).strip()
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67 header_value = request.headers.get(header, None)
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68 if header_value is not None:
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69 header_value = text_type(header_value)
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70 data[u"vary"][header] = header_value
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71
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72 return b",".join([b"cc=4", msgpack.dumps(data, use_bin_type=True)])
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73
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74 def loads(self, request, data):
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75 # Short circuit if we've been given an empty set of data
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76 if not data:
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77 return
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78
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79 # Determine what version of the serializer the data was serialized
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80 # with
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81 try:
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82 ver, data = data.split(b",", 1)
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83 except ValueError:
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84 ver = b"cc=0"
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85
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86 # Make sure that our "ver" is actually a version and isn't a false
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87 # positive from a , being in the data stream.
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88 if ver[:3] != b"cc=":
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89 data = ver + data
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90 ver = b"cc=0"
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91
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92 # Get the version number out of the cc=N
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93 ver = ver.split(b"=", 1)[-1].decode("ascii")
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94
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95 # Dispatch to the actual load method for the given version
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96 try:
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97 return getattr(self, "_loads_v{}".format(ver))(request, data)
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98
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99 except AttributeError:
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100 # This is a version we don't have a loads function for, so we'll
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101 # just treat it as a miss and return None
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102 return
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103
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104 def prepare_response(self, request, cached):
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105 """Verify our vary headers match and construct a real urllib3
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106 HTTPResponse object.
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107 """
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108 # Special case the '*' Vary value as it means we cannot actually
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109 # determine if the cached response is suitable for this request.
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110 # This case is also handled in the controller code when creating
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111 # a cache entry, but is left here for backwards compatibility.
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112 if "*" in cached.get("vary", {}):
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113 return
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114
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115 # Ensure that the Vary headers for the cached response match our
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116 # request
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117 for header, value in cached.get("vary", {}).items():
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118 if request.headers.get(header, None) != value:
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119 return
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120
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121 body_raw = cached["response"].pop("body")
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122
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123 headers = CaseInsensitiveDict(data=cached["response"]["headers"])
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124 if headers.get("transfer-encoding", "") == "chunked":
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125 headers.pop("transfer-encoding")
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126
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127 cached["response"]["headers"] = headers
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128
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129 try:
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130 body = io.BytesIO(body_raw)
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131 except TypeError:
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132 # This can happen if cachecontrol serialized to v1 format (pickle)
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133 # using Python 2. A Python 2 str(byte string) will be unpickled as
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134 # a Python 3 str (unicode string), which will cause the above to
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135 # fail with:
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136 #
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137 # TypeError: 'str' does not support the buffer interface
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138 body = io.BytesIO(body_raw.encode("utf8"))
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139
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140 return HTTPResponse(body=body, preload_content=False, **cached["response"])
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141
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142 def _loads_v0(self, request, data):
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143 # The original legacy cache data. This doesn't contain enough
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144 # information to construct everything we need, so we'll treat this as
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145 # a miss.
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146 return
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147
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148 def _loads_v1(self, request, data):
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149 try:
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150 cached = pickle.loads(data)
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151 except ValueError:
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152 return
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153
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154 return self.prepare_response(request, cached)
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155
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156 def _loads_v2(self, request, data):
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157 try:
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158 cached = json.loads(zlib.decompress(data).decode("utf8"))
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159 except (ValueError, zlib.error):
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160 return
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161
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162 # We need to decode the items that we've base64 encoded
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163 cached["response"]["body"] = _b64_decode_bytes(cached["response"]["body"])
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164 cached["response"]["headers"] = dict(
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165 (_b64_decode_str(k), _b64_decode_str(v))
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166 for k, v in cached["response"]["headers"].items()
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167 )
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168 cached["response"]["reason"] = _b64_decode_str(cached["response"]["reason"])
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169 cached["vary"] = dict(
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170 (_b64_decode_str(k), _b64_decode_str(v) if v is not None else v)
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171 for k, v in cached["vary"].items()
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172 )
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173
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174 return self.prepare_response(request, cached)
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175
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176 def _loads_v3(self, request, data):
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177 # Due to Python 2 encoding issues, it's impossible to know for sure
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178 # exactly how to load v3 entries, thus we'll treat these as a miss so
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179 # that they get rewritten out as v4 entries.
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180 return
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181
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182 def _loads_v4(self, request, data):
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183 try:
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184 cached = msgpack.loads(data, raw=False)
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185 except ValueError:
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186 return
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187
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188 return self.prepare_response(request, cached)