Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/cachecontrol/controller.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 """
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2 The httplib2 algorithms ported for use with requests.
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3 """
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4 import logging
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5 import re
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6 import calendar
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7 import time
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8 from email.utils import parsedate_tz
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9
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10 from requests.structures import CaseInsensitiveDict
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11
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12 from .cache import DictCache
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13 from .serialize import Serializer
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14
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15
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16 logger = logging.getLogger(__name__)
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17
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18 URI = re.compile(r"^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?")
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19
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20
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21 def parse_uri(uri):
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22 """Parses a URI using the regex given in Appendix B of RFC 3986.
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23
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24 (scheme, authority, path, query, fragment) = parse_uri(uri)
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25 """
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26 groups = URI.match(uri).groups()
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27 return (groups[1], groups[3], groups[4], groups[6], groups[8])
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28
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29
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30 class CacheController(object):
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31 """An interface to see if request should cached or not.
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32 """
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33 def __init__(self, cache=None, cache_etags=True, serializer=None):
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34 self.cache = cache or DictCache()
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35 self.cache_etags = cache_etags
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36 self.serializer = serializer or Serializer()
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37
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38 @classmethod
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39 def _urlnorm(cls, uri):
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40 """Normalize the URL to create a safe key for the cache"""
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41 (scheme, authority, path, query, fragment) = parse_uri(uri)
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42 if not scheme or not authority:
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43 raise Exception("Only absolute URIs are allowed. uri = %s" % uri)
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44
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45 scheme = scheme.lower()
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46 authority = authority.lower()
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47
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48 if not path:
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49 path = "/"
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50
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51 # Could do syntax based normalization of the URI before
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52 # computing the digest. See Section 6.2.2 of Std 66.
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53 request_uri = query and "?".join([path, query]) or path
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54 defrag_uri = scheme + "://" + authority + request_uri
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55
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56 return defrag_uri
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57
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58 @classmethod
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59 def cache_url(cls, uri):
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60 return cls._urlnorm(uri)
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61
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62 def parse_cache_control(self, headers):
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63 """
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64 Parse the cache control headers returning a dictionary with values
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65 for the different directives.
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66 """
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67 retval = {}
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68
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69 cc_header = 'cache-control'
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70 if 'Cache-Control' in headers:
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71 cc_header = 'Cache-Control'
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72
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73 if cc_header in headers:
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74 parts = headers[cc_header].split(',')
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75 parts_with_args = [
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76 tuple([x.strip().lower() for x in part.split("=", 1)])
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77 for part in parts if -1 != part.find("=")
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78 ]
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79 parts_wo_args = [
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80 (name.strip().lower(), 1)
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81 for name in parts if -1 == name.find("=")
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82 ]
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83 retval = dict(parts_with_args + parts_wo_args)
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84 return retval
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85
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86 def cached_request(self, request):
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87 """
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88 Return a cached response if it exists in the cache, otherwise
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89 return False.
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90 """
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91 cache_url = self.cache_url(request.url)
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92 logger.debug('Looking up "%s" in the cache', cache_url)
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93 cc = self.parse_cache_control(request.headers)
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94
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95 # Bail out if the request insists on fresh data
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96 if 'no-cache' in cc:
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97 logger.debug('Request header has "no-cache", cache bypassed')
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98 return False
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99
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100 if 'max-age' in cc and cc['max-age'] == 0:
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101 logger.debug('Request header has "max_age" as 0, cache bypassed')
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102 return False
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103
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104 # Request allows serving from the cache, let's see if we find something
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105 cache_data = self.cache.get(cache_url)
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106 if cache_data is None:
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107 logger.debug('No cache entry available')
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108 return False
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109
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110 # Check whether it can be deserialized
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111 resp = self.serializer.loads(request, cache_data)
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112 if not resp:
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113 logger.warning('Cache entry deserialization failed, entry ignored')
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114 return False
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115
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116 # If we have a cached 301, return it immediately. We don't
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117 # need to test our response for other headers b/c it is
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118 # intrinsically "cacheable" as it is Permanent.
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119 # See:
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120 # https://tools.ietf.org/html/rfc7231#section-6.4.2
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121 #
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122 # Client can try to refresh the value by repeating the request
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123 # with cache busting headers as usual (ie no-cache).
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124 if resp.status == 301:
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125 msg = ('Returning cached "301 Moved Permanently" response '
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126 '(ignoring date and etag information)')
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127 logger.debug(msg)
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128 return resp
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129
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130 headers = CaseInsensitiveDict(resp.headers)
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131 if not headers or 'date' not in headers:
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132 if 'etag' not in headers:
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133 # Without date or etag, the cached response can never be used
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134 # and should be deleted.
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135 logger.debug('Purging cached response: no date or etag')
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136 self.cache.delete(cache_url)
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137 logger.debug('Ignoring cached response: no date')
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138 return False
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139
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140 now = time.time()
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141 date = calendar.timegm(
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142 parsedate_tz(headers['date'])
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143 )
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144 current_age = max(0, now - date)
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145 logger.debug('Current age based on date: %i', current_age)
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146
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147 # TODO: There is an assumption that the result will be a
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148 # urllib3 response object. This may not be best since we
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149 # could probably avoid instantiating or constructing the
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150 # response until we know we need it.
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151 resp_cc = self.parse_cache_control(headers)
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152
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153 # determine freshness
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154 freshness_lifetime = 0
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155
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156 # Check the max-age pragma in the cache control header
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157 if 'max-age' in resp_cc and resp_cc['max-age'].isdigit():
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158 freshness_lifetime = int(resp_cc['max-age'])
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159 logger.debug('Freshness lifetime from max-age: %i',
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160 freshness_lifetime)
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161
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162 # If there isn't a max-age, check for an expires header
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163 elif 'expires' in headers:
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164 expires = parsedate_tz(headers['expires'])
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165 if expires is not None:
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166 expire_time = calendar.timegm(expires) - date
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167 freshness_lifetime = max(0, expire_time)
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168 logger.debug("Freshness lifetime from expires: %i",
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169 freshness_lifetime)
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170
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171 # Determine if we are setting freshness limit in the
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172 # request. Note, this overrides what was in the response.
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173 if 'max-age' in cc:
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174 try:
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175 freshness_lifetime = int(cc['max-age'])
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176 logger.debug('Freshness lifetime from request max-age: %i',
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177 freshness_lifetime)
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178 except ValueError:
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179 freshness_lifetime = 0
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180
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181 if 'min-fresh' in cc:
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182 try:
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183 min_fresh = int(cc['min-fresh'])
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184 except ValueError:
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185 min_fresh = 0
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186 # adjust our current age by our min fresh
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187 current_age += min_fresh
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188 logger.debug('Adjusted current age from min-fresh: %i',
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189 current_age)
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190
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191 # Return entry if it is fresh enough
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192 if freshness_lifetime > current_age:
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193 logger.debug('The response is "fresh", returning cached response')
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194 logger.debug('%i > %i', freshness_lifetime, current_age)
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195 return resp
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196
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197 # we're not fresh. If we don't have an Etag, clear it out
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198 if 'etag' not in headers:
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199 logger.debug(
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200 'The cached response is "stale" with no etag, purging'
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201 )
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202 self.cache.delete(cache_url)
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203
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204 # return the original handler
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205 return False
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206
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207 def conditional_headers(self, request):
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208 cache_url = self.cache_url(request.url)
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209 resp = self.serializer.loads(request, self.cache.get(cache_url))
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210 new_headers = {}
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211
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212 if resp:
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213 headers = CaseInsensitiveDict(resp.headers)
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214
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215 if 'etag' in headers:
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216 new_headers['If-None-Match'] = headers['ETag']
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217
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218 if 'last-modified' in headers:
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219 new_headers['If-Modified-Since'] = headers['Last-Modified']
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220
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221 return new_headers
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222
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223 def cache_response(self, request, response, body=None):
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224 """
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225 Algorithm for caching requests.
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226
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227 This assumes a requests Response object.
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228 """
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229 # From httplib2: Don't cache 206's since we aren't going to
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230 # handle byte range requests
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231 cacheable_status_codes = [200, 203, 300, 301]
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232 if response.status not in cacheable_status_codes:
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233 logger.debug(
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234 'Status code %s not in %s',
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235 response.status,
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236 cacheable_status_codes
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237 )
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238 return
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239
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240 response_headers = CaseInsensitiveDict(response.headers)
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241
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242 # If we've been given a body, our response has a Content-Length, that
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243 # Content-Length is valid then we can check to see if the body we've
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244 # been given matches the expected size, and if it doesn't we'll just
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245 # skip trying to cache it.
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246 if (body is not None and
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247 "content-length" in response_headers and
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248 response_headers["content-length"].isdigit() and
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249 int(response_headers["content-length"]) != len(body)):
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250 return
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251
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252 cc_req = self.parse_cache_control(request.headers)
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253 cc = self.parse_cache_control(response_headers)
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254
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255 cache_url = self.cache_url(request.url)
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256 logger.debug('Updating cache with response from "%s"', cache_url)
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257
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258 # Delete it from the cache if we happen to have it stored there
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259 no_store = False
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260 if cc.get('no-store'):
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261 no_store = True
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262 logger.debug('Response header has "no-store"')
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263 if cc_req.get('no-store'):
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264 no_store = True
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265 logger.debug('Request header has "no-store"')
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266 if no_store and self.cache.get(cache_url):
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267 logger.debug('Purging existing cache entry to honor "no-store"')
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268 self.cache.delete(cache_url)
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269
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270 # If we've been given an etag, then keep the response
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271 if self.cache_etags and 'etag' in response_headers:
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272 logger.debug('Caching due to etag')
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273 self.cache.set(
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274 cache_url,
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275 self.serializer.dumps(request, response, body=body),
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276 )
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277
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278 # Add to the cache any 301s. We do this before looking that
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279 # the Date headers.
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280 elif response.status == 301:
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281 logger.debug('Caching permanant redirect')
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282 self.cache.set(
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283 cache_url,
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284 self.serializer.dumps(request, response)
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285 )
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286
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287 # Add to the cache if the response headers demand it. If there
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288 # is no date header then we can't do anything about expiring
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289 # the cache.
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290 elif 'date' in response_headers:
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291 # cache when there is a max-age > 0
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292 if cc and cc.get('max-age'):
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293 if cc['max-age'].isdigit() and int(cc['max-age']) > 0:
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294 logger.debug('Caching b/c date exists and max-age > 0')
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295 self.cache.set(
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296 cache_url,
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297 self.serializer.dumps(request, response, body=body),
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298 )
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299
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300 # If the request can expire, it means we should cache it
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301 # in the meantime.
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302 elif 'expires' in response_headers:
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303 if response_headers['expires']:
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304 logger.debug('Caching b/c of expires header')
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305 self.cache.set(
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306 cache_url,
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307 self.serializer.dumps(request, response, body=body),
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308 )
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309
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310 def update_cached_response(self, request, response):
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311 """On a 304 we will get a new set of headers that we want to
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312 update our cached value with, assuming we have one.
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313
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314 This should only ever be called when we've sent an ETag and
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315 gotten a 304 as the response.
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316 """
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317 cache_url = self.cache_url(request.url)
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318
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319 cached_response = self.serializer.loads(
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320 request,
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321 self.cache.get(cache_url)
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322 )
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323
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324 if not cached_response:
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325 # we didn't have a cached response
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326 return response
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327
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328 # Lets update our headers with the headers from the new request:
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329 # http://tools.ietf.org/html/draft-ietf-httpbis-p4-conditional-26#section-4.1
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330 #
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331 # The server isn't supposed to send headers that would make
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332 # the cached body invalid. But... just in case, we'll be sure
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333 # to strip out ones we know that might be problmatic due to
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334 # typical assumptions.
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335 excluded_headers = [
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336 "content-length",
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337 ]
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338
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339 cached_response.headers.update(
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340 dict((k, v) for k, v in response.headers.items()
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341 if k.lower() not in excluded_headers)
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342 )
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343
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344 # we want a 200 b/c we have content via the cache
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345 cached_response.status = 200
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346
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347 # update our cache
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348 self.cache.set(
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349 cache_url,
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350 self.serializer.dumps(request, cached_response),
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351 )
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352
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353 return cached_response