Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/cachecontrol/serialize.py @ 0:26e78fe6e8c4 draft

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"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
parents
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0
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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 requests.structures import CaseInsensitiveDict
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7
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8 from .compat import HTTPResponse, pickle, text_type
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9
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10
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11 def _b64_encode_bytes(b):
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12 return base64.b64encode(b).decode("ascii")
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13
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14
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15 def _b64_encode_str(s):
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16 return _b64_encode_bytes(s.encode("utf8"))
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17
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18
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19 def _b64_encode(s):
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20 if isinstance(s, text_type):
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21 return _b64_encode_str(s)
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22 return _b64_encode_bytes(s)
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23
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24
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25 def _b64_decode_bytes(b):
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26 return base64.b64decode(b.encode("ascii"))
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27
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28
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29 def _b64_decode_str(s):
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30 return _b64_decode_bytes(s).decode("utf8")
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31
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32
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33 class Serializer(object):
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34
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35 def dumps(self, request, response, body=None):
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36 response_headers = CaseInsensitiveDict(response.headers)
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37
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38 if body is None:
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39 body = response.read(decode_content=False)
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40
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41 # NOTE: 99% sure this is dead code. I'm only leaving it
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42 # here b/c I don't have a test yet to prove
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43 # it. Basically, before using
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44 # `cachecontrol.filewrapper.CallbackFileWrapper`,
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45 # this made an effort to reset the file handle. The
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46 # `CallbackFileWrapper` short circuits this code by
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47 # setting the body as the content is consumed, the
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48 # result being a `body` argument is *always* passed
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49 # into cache_response, and in turn,
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50 # `Serializer.dump`.
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51 response._fp = io.BytesIO(body)
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52
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53 data = {
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54 "response": {
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55 "body": _b64_encode_bytes(body),
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56 "headers": dict(
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57 (_b64_encode(k), _b64_encode(v))
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58 for k, v in response.headers.items()
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59 ),
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60 "status": response.status,
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61 "version": response.version,
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62 "reason": _b64_encode_str(response.reason),
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63 "strict": response.strict,
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64 "decode_content": response.decode_content,
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65 },
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66 }
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67
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68 # Construct our vary headers
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69 data["vary"] = {}
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70 if "vary" in response_headers:
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71 varied_headers = response_headers['vary'].split(',')
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72 for header in varied_headers:
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73 header = header.strip()
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74 data["vary"][header] = request.headers.get(header, None)
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75
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76 # Encode our Vary headers to ensure they can be serialized as JSON
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77 data["vary"] = dict(
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78 (_b64_encode(k), _b64_encode(v) if v is not None else v)
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79 for k, v in data["vary"].items()
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80 )
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81
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82 return b",".join([
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83 b"cc=2",
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84 zlib.compress(
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85 json.dumps(
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86 data, separators=(",", ":"), sort_keys=True,
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87 ).encode("utf8"),
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88 ),
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89 ])
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90
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91 def loads(self, request, data):
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92 # Short circuit if we've been given an empty set of data
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93 if not data:
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94 return
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95
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96 # Determine what version of the serializer the data was serialized
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97 # with
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98 try:
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99 ver, data = data.split(b",", 1)
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100 except ValueError:
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101 ver = b"cc=0"
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102
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103 # Make sure that our "ver" is actually a version and isn't a false
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104 # positive from a , being in the data stream.
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105 if ver[:3] != b"cc=":
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106 data = ver + data
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107 ver = b"cc=0"
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108
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109 # Get the version number out of the cc=N
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110 ver = ver.split(b"=", 1)[-1].decode("ascii")
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111
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112 # Dispatch to the actual load method for the given version
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113 try:
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114 return getattr(self, "_loads_v{0}".format(ver))(request, data)
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115 except AttributeError:
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116 # This is a version we don't have a loads function for, so we'll
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117 # just treat it as a miss and return None
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118 return
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119
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120 def prepare_response(self, request, cached):
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121 """Verify our vary headers match and construct a real urllib3
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122 HTTPResponse object.
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123 """
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124 # Special case the '*' Vary value as it means we cannot actually
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125 # determine if the cached response is suitable for this request.
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126 if "*" in cached.get("vary", {}):
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127 return
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128
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129 # Ensure that the Vary headers for the cached response match our
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130 # request
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131 for header, value in cached.get("vary", {}).items():
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132 if request.headers.get(header, None) != value:
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133 return
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134
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135 body_raw = cached["response"].pop("body")
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136
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137 headers = CaseInsensitiveDict(data=cached['response']['headers'])
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138 if headers.get('transfer-encoding', '') == 'chunked':
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139 headers.pop('transfer-encoding')
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140
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141 cached['response']['headers'] = headers
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142
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143 try:
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144 body = io.BytesIO(body_raw)
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145 except TypeError:
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146 # This can happen if cachecontrol serialized to v1 format (pickle)
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147 # using Python 2. A Python 2 str(byte string) will be unpickled as
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148 # a Python 3 str (unicode string), which will cause the above to
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149 # fail with:
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150 #
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151 # TypeError: 'str' does not support the buffer interface
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152 body = io.BytesIO(body_raw.encode('utf8'))
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153
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154 return HTTPResponse(
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155 body=body,
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156 preload_content=False,
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157 **cached["response"]
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158 )
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159
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160 def _loads_v0(self, request, data):
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161 # The original legacy cache data. This doesn't contain enough
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162 # information to construct everything we need, so we'll treat this as
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163 # a miss.
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164 return
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165
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166 def _loads_v1(self, request, data):
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167 try:
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168 cached = pickle.loads(data)
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169 except ValueError:
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170 return
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171
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172 return self.prepare_response(request, cached)
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173
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174 def _loads_v2(self, request, data):
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175 try:
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176 cached = json.loads(zlib.decompress(data).decode("utf8"))
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177 except ValueError:
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178 return
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179
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180 # We need to decode the items that we've base64 encoded
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181 cached["response"]["body"] = _b64_decode_bytes(
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182 cached["response"]["body"]
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183 )
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184 cached["response"]["headers"] = dict(
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185 (_b64_decode_str(k), _b64_decode_str(v))
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186 for k, v in cached["response"]["headers"].items()
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187 )
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188 cached["response"]["reason"] = _b64_decode_str(
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189 cached["response"]["reason"],
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190 )
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191 cached["vary"] = dict(
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192 (_b64_decode_str(k), _b64_decode_str(v) if v is not None else v)
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193 for k, v in cached["vary"].items()
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194 )
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195
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196 return self.prepare_response(request, cached)