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annotate lib/python3.8/site-packages/pip/_vendor/cachecontrol/controller.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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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 pip._vendor.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
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34 def __init__(
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35 self, cache=None, cache_etags=True, serializer=None, status_codes=None
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36 ):
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37 self.cache = DictCache() if cache is None else cache
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38 self.cache_etags = cache_etags
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39 self.serializer = serializer or Serializer()
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40 self.cacheable_status_codes = status_codes or (200, 203, 300, 301)
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41
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42 @classmethod
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43 def _urlnorm(cls, uri):
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44 """Normalize the URL to create a safe key for the cache"""
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45 (scheme, authority, path, query, fragment) = parse_uri(uri)
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46 if not scheme or not authority:
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47 raise Exception("Only absolute URIs are allowed. uri = %s" % uri)
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48
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49 scheme = scheme.lower()
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50 authority = authority.lower()
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51
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52 if not path:
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53 path = "/"
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54
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55 # Could do syntax based normalization of the URI before
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56 # computing the digest. See Section 6.2.2 of Std 66.
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57 request_uri = query and "?".join([path, query]) or path
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58 defrag_uri = scheme + "://" + authority + request_uri
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59
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60 return defrag_uri
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61
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62 @classmethod
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63 def cache_url(cls, uri):
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64 return cls._urlnorm(uri)
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65
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66 def parse_cache_control(self, headers):
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67 known_directives = {
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68 # https://tools.ietf.org/html/rfc7234#section-5.2
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69 "max-age": (int, True),
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70 "max-stale": (int, False),
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71 "min-fresh": (int, True),
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72 "no-cache": (None, False),
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73 "no-store": (None, False),
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74 "no-transform": (None, False),
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75 "only-if-cached": (None, False),
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76 "must-revalidate": (None, False),
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77 "public": (None, False),
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78 "private": (None, False),
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79 "proxy-revalidate": (None, False),
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80 "s-maxage": (int, True),
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81 }
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82
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83 cc_headers = headers.get("cache-control", headers.get("Cache-Control", ""))
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84
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85 retval = {}
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86
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87 for cc_directive in cc_headers.split(","):
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88 if not cc_directive.strip():
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89 continue
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90
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91 parts = cc_directive.split("=", 1)
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92 directive = parts[0].strip()
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93
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94 try:
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95 typ, required = known_directives[directive]
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96 except KeyError:
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97 logger.debug("Ignoring unknown cache-control directive: %s", directive)
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98 continue
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99
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100 if not typ or not required:
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101 retval[directive] = None
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102 if typ:
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103 try:
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104 retval[directive] = typ(parts[1].strip())
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105 except IndexError:
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106 if required:
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107 logger.debug(
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108 "Missing value for cache-control " "directive: %s",
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109 directive,
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110 )
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111 except ValueError:
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112 logger.debug(
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113 "Invalid value for cache-control directive " "%s, must be %s",
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114 directive,
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115 typ.__name__,
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116 )
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117
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118 return retval
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119
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120 def cached_request(self, request):
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121 """
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122 Return a cached response if it exists in the cache, otherwise
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123 return False.
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124 """
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125 cache_url = self.cache_url(request.url)
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126 logger.debug('Looking up "%s" in the cache', cache_url)
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127 cc = self.parse_cache_control(request.headers)
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128
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129 # Bail out if the request insists on fresh data
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130 if "no-cache" in cc:
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131 logger.debug('Request header has "no-cache", cache bypassed')
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132 return False
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133
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134 if "max-age" in cc and cc["max-age"] == 0:
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135 logger.debug('Request header has "max_age" as 0, cache bypassed')
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136 return False
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137
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138 # Request allows serving from the cache, let's see if we find something
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139 cache_data = self.cache.get(cache_url)
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140 if cache_data is None:
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141 logger.debug("No cache entry available")
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142 return False
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143
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144 # Check whether it can be deserialized
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145 resp = self.serializer.loads(request, cache_data)
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146 if not resp:
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147 logger.warning("Cache entry deserialization failed, entry ignored")
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148 return False
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149
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150 # If we have a cached 301, return it immediately. We don't
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151 # need to test our response for other headers b/c it is
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152 # intrinsically "cacheable" as it is Permanent.
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153 # See:
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154 # https://tools.ietf.org/html/rfc7231#section-6.4.2
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155 #
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156 # Client can try to refresh the value by repeating the request
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157 # with cache busting headers as usual (ie no-cache).
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158 if resp.status == 301:
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159 msg = (
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160 'Returning cached "301 Moved Permanently" response '
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161 "(ignoring date and etag information)"
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162 )
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163 logger.debug(msg)
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164 return resp
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165
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166 headers = CaseInsensitiveDict(resp.headers)
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167 if not headers or "date" not in headers:
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168 if "etag" not in headers:
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169 # Without date or etag, the cached response can never be used
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170 # and should be deleted.
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171 logger.debug("Purging cached response: no date or etag")
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172 self.cache.delete(cache_url)
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173 logger.debug("Ignoring cached response: no date")
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174 return False
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175
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176 now = time.time()
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177 date = calendar.timegm(parsedate_tz(headers["date"]))
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178 current_age = max(0, now - date)
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179 logger.debug("Current age based on date: %i", current_age)
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180
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181 # TODO: There is an assumption that the result will be a
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182 # urllib3 response object. This may not be best since we
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183 # could probably avoid instantiating or constructing the
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184 # response until we know we need it.
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185 resp_cc = self.parse_cache_control(headers)
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186
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187 # determine freshness
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188 freshness_lifetime = 0
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189
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190 # Check the max-age pragma in the cache control header
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191 if "max-age" in resp_cc:
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192 freshness_lifetime = resp_cc["max-age"]
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193 logger.debug("Freshness lifetime from max-age: %i", freshness_lifetime)
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194
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195 # If there isn't a max-age, check for an expires header
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196 elif "expires" in headers:
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197 expires = parsedate_tz(headers["expires"])
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198 if expires is not None:
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199 expire_time = calendar.timegm(expires) - date
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200 freshness_lifetime = max(0, expire_time)
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201 logger.debug("Freshness lifetime from expires: %i", freshness_lifetime)
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202
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203 # Determine if we are setting freshness limit in the
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204 # request. Note, this overrides what was in the response.
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205 if "max-age" in cc:
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206 freshness_lifetime = cc["max-age"]
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207 logger.debug(
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208 "Freshness lifetime from request max-age: %i", freshness_lifetime
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209 )
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210
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211 if "min-fresh" in cc:
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212 min_fresh = cc["min-fresh"]
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213 # adjust our current age by our min fresh
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214 current_age += min_fresh
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215 logger.debug("Adjusted current age from min-fresh: %i", current_age)
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216
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217 # Return entry if it is fresh enough
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218 if freshness_lifetime > current_age:
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219 logger.debug('The response is "fresh", returning cached response')
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220 logger.debug("%i > %i", freshness_lifetime, current_age)
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221 return resp
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222
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223 # we're not fresh. If we don't have an Etag, clear it out
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224 if "etag" not in headers:
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225 logger.debug('The cached response is "stale" with no etag, purging')
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226 self.cache.delete(cache_url)
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227
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228 # return the original handler
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229 return False
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230
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231 def conditional_headers(self, request):
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232 cache_url = self.cache_url(request.url)
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233 resp = self.serializer.loads(request, self.cache.get(cache_url))
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234 new_headers = {}
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235
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236 if resp:
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237 headers = CaseInsensitiveDict(resp.headers)
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238
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239 if "etag" in headers:
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240 new_headers["If-None-Match"] = headers["ETag"]
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241
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242 if "last-modified" in headers:
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243 new_headers["If-Modified-Since"] = headers["Last-Modified"]
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244
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245 return new_headers
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246
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247 def cache_response(self, request, response, body=None, status_codes=None):
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248 """
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249 Algorithm for caching requests.
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250
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251 This assumes a requests Response object.
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252 """
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253 # From httplib2: Don't cache 206's since we aren't going to
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254 # handle byte range requests
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255 cacheable_status_codes = status_codes or self.cacheable_status_codes
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256 if response.status not in cacheable_status_codes:
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257 logger.debug(
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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258 "Status code %s not in %s", response.status, cacheable_status_codes
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259 )
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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diff changeset
260 return
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261
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262 response_headers = CaseInsensitiveDict(response.headers)
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263
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264 # If we've been given a body, our response has a Content-Length, that
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265 # Content-Length is valid then we can check to see if the body we've
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266 # been given matches the expected size, and if it doesn't we'll just
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267 # skip trying to cache it.
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268 if (
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269 body is not None
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270 and "content-length" in response_headers
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271 and response_headers["content-length"].isdigit()
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272 and int(response_headers["content-length"]) != len(body)
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273 ):
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274 return
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275
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276 cc_req = self.parse_cache_control(request.headers)
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277 cc = self.parse_cache_control(response_headers)
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278
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279 cache_url = self.cache_url(request.url)
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280 logger.debug('Updating cache with response from "%s"', cache_url)
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281
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282 # Delete it from the cache if we happen to have it stored there
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283 no_store = False
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284 if "no-store" in cc:
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285 no_store = True
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286 logger.debug('Response header has "no-store"')
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287 if "no-store" in cc_req:
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288 no_store = True
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289 logger.debug('Request header has "no-store"')
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290 if no_store and self.cache.get(cache_url):
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291 logger.debug('Purging existing cache entry to honor "no-store"')
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292 self.cache.delete(cache_url)
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293 if no_store:
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294 return
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295
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296 # https://tools.ietf.org/html/rfc7234#section-4.1:
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297 # A Vary header field-value of "*" always fails to match.
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298 # Storing such a response leads to a deserialization warning
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299 # during cache lookup and is not allowed to ever be served,
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300 # so storing it can be avoided.
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301 if "*" in response_headers.get("vary", ""):
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302 logger.debug('Response header has "Vary: *"')
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303 return
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304
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305 # If we've been given an etag, then keep the response
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306 if self.cache_etags and "etag" in response_headers:
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307 logger.debug("Caching due to etag")
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308 self.cache.set(
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309 cache_url, self.serializer.dumps(request, response, body=body)
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310 )
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311
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312 # Add to the cache any 301s. We do this before looking that
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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313 # the Date headers.
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314 elif response.status == 301:
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315 logger.debug("Caching permanant redirect")
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316 self.cache.set(cache_url, self.serializer.dumps(request, response))
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317
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318 # Add to the cache if the response headers demand it. If there
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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319 # is no date header then we can't do anything about expiring
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320 # the cache.
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321 elif "date" in response_headers:
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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322 # cache when there is a max-age > 0
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323 if "max-age" in cc and cc["max-age"] > 0:
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324 logger.debug("Caching b/c date exists and max-age > 0")
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325 self.cache.set(
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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326 cache_url, self.serializer.dumps(request, response, body=body)
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327 )
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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328
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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329 # If the request can expire, it means we should cache it
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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330 # in the meantime.
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331 elif "expires" in response_headers:
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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332 if response_headers["expires"]:
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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333 logger.debug("Caching b/c of expires header")
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334 self.cache.set(
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335 cache_url, self.serializer.dumps(request, response, body=body)
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336 )
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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337
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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338 def update_cached_response(self, request, response):
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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339 """On a 304 we will get a new set of headers that we want to
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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340 update our cached value with, assuming we have one.
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341
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342 This should only ever be called when we've sent an ETag and
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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343 gotten a 304 as the response.
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344 """
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345 cache_url = self.cache_url(request.url)
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346
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347 cached_response = self.serializer.loads(request, self.cache.get(cache_url))
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348
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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349 if not cached_response:
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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350 # we didn't have a cached response
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351 return response
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352
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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353 # Lets update our headers with the headers from the new request:
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354 # http://tools.ietf.org/html/draft-ietf-httpbis-p4-conditional-26#section-4.1
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355 #
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356 # The server isn't supposed to send headers that would make
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357 # the cached body invalid. But... just in case, we'll be sure
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358 # to strip out ones we know that might be problmatic due to
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359 # typical assumptions.
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360 excluded_headers = ["content-length"]
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361
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362 cached_response.headers.update(
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363 dict(
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364 (k, v)
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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365 for k, v in response.headers.items()
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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366 if k.lower() not in excluded_headers
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367 )
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368 )
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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369
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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370 # we want a 200 b/c we have content via the cache
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371 cached_response.status = 200
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372
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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373 # update our cache
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374 self.cache.set(cache_url, self.serializer.dumps(request, cached_response))
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375
9e54283cc701 "planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
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376 return cached_response