Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/boto/regioninfo.py @ 3:758bc20232e8 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:20:52 -0400
parents 26e78fe6e8c4
children
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1 # Copyright (c) 2006-2010 Mitch Garnaat http://garnaat.org/
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2 # Copyright (c) 2010, Eucalyptus Systems, Inc.
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3 # All rights reserved.
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4 #
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5 # Permission is hereby granted, free of charge, to any person obtaining a
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6 # copy of this software and associated documentation files (the
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7 # "Software"), to deal in the Software without restriction, including
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8 # without limitation the rights to use, copy, modify, merge, publish, dis-
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9 # tribute, sublicense, and/or sell copies of the Software, and to permit
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10 # persons to whom the Software is furnished to do so, subject to the fol-
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11 # lowing conditions:
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12 #
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13 # The above copyright notice and this permission notice shall be included
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14 # in all copies or substantial portions of the Software.
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15 #
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16 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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17 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
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18 # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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19 # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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20 # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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22 # IN THE SOFTWARE.
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23 import os
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24
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25 import boto
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26 from boto.compat import json
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27 from boto.exception import BotoClientError
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28 from boto.endpoints import BotoEndpointResolver
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29 from boto.endpoints import StaticEndpointBuilder
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30
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31
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32 _endpoints_cache = {}
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33
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34
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35 def load_endpoint_json(path):
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36 """
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37 Loads a given JSON file & returns it.
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38
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39 :param path: The path to the JSON file
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40 :type path: string
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41
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42 :returns: The loaded data
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43 """
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44 return _load_json_file(path)
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45
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46
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47 def _load_json_file(path):
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48 """
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49 Loads a given JSON file & returns it.
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50
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51 :param path: The path to the JSON file
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52 :type path: string
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53
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54 :returns: The loaded data
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55 """
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56 with open(path, 'r') as endpoints_file:
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57 return json.load(endpoints_file)
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58
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59
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60 def merge_endpoints(defaults, additions):
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61 """
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62 Given an existing set of endpoint data, this will deep-update it with
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63 any similarly structured data in the additions.
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64
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65 :param defaults: The existing endpoints data
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66 :type defaults: dict
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67
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68 :param defaults: The additional endpoints data
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69 :type defaults: dict
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70
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71 :returns: The modified endpoints data
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72 :rtype: dict
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73 """
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74 # We can't just do an ``defaults.update(...)`` here, as that could
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75 # *overwrite* regions if present in both.
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76 # We'll iterate instead, essentially doing a deeper merge.
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77 for service, region_info in additions.items():
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78 # Set the default, if not present, to an empty dict.
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79 defaults.setdefault(service, {})
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80 defaults[service].update(region_info)
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81
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82 return defaults
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83
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84
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85 def load_regions():
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86 """
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87 Actually load the region/endpoint information from the JSON files.
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88
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89 By default, this loads from the default included ``boto/endpoints.json``
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90 file.
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91
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92 Users can override/extend this by supplying either a ``BOTO_ENDPOINTS``
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93 environment variable or a ``endpoints_path`` config variable, either of
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94 which should be an absolute path to the user's JSON file.
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95
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96 :returns: The endpoints data
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97 :rtype: dict
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98 """
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99 # Load the defaults first.
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100 endpoints = _load_builtin_endpoints()
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101 additional_path = None
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102
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103 # Try the ENV var. If not, check the config file.
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104 if os.environ.get('BOTO_ENDPOINTS'):
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105 additional_path = os.environ['BOTO_ENDPOINTS']
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106 elif boto.config.get('Boto', 'endpoints_path'):
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107 additional_path = boto.config.get('Boto', 'endpoints_path')
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108
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109 # If there's a file provided, we'll load it & additively merge it into
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110 # the endpoints.
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111 if additional_path:
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112 additional = load_endpoint_json(additional_path)
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113 endpoints = merge_endpoints(endpoints, additional)
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114
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115 return endpoints
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116
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117
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118 def _load_builtin_endpoints(_cache=_endpoints_cache):
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119 """Loads the builtin endpoints in the legacy format."""
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120 # If there's a cached response, return it
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121 if _cache:
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122 return _cache
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123
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124 # Load the endpoints file
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125 endpoints = _load_json_file(boto.ENDPOINTS_PATH)
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126
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127 # Build the endpoints into the legacy format
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128 resolver = BotoEndpointResolver(endpoints)
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129 builder = StaticEndpointBuilder(resolver)
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130 endpoints = builder.build_static_endpoints()
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131
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132 # Cache the endpoints and then return them
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133 _cache.update(endpoints)
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134 return _cache
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135
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136
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137 def get_regions(service_name, region_cls=None, connection_cls=None):
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138 """
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139 Given a service name (like ``ec2``), returns a list of ``RegionInfo``
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140 objects for that service.
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141
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142 This leverages the ``endpoints.json`` file (+ optional user overrides) to
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143 configure/construct all the objects.
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144
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145 :param service_name: The name of the service to construct the ``RegionInfo``
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146 objects for. Ex: ``ec2``, ``s3``, ``sns``, etc.
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147 :type service_name: string
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148
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149 :param region_cls: (Optional) The class to use when constructing. By
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150 default, this is ``RegionInfo``.
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151 :type region_cls: class
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152
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153 :param connection_cls: (Optional) The connection class for the
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154 ``RegionInfo`` object. Providing this allows the ``connect`` method on
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155 the ``RegionInfo`` to work. Default is ``None`` (no connection).
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156 :type connection_cls: class
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157
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158 :returns: A list of configured ``RegionInfo`` objects
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159 :rtype: list
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160 """
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161 endpoints = load_regions()
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162
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163 if service_name not in endpoints:
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164 raise BotoClientError(
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165 "Service '%s' not found in endpoints." % service_name
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166 )
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167
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168 if region_cls is None:
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169 region_cls = RegionInfo
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170
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171 region_objs = []
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172
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173 for region_name, endpoint in endpoints.get(service_name, {}).items():
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174 region_objs.append(
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175 region_cls(
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176 name=region_name,
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177 endpoint=endpoint,
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178 connection_cls=connection_cls
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179 )
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180 )
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181
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182 return region_objs
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183
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184
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185 def connect(service_name, region_name, region_cls=None,
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186 connection_cls=None, **kw_params):
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187 """Create a connection class for a given service in a given region.
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188
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189 :param service_name: The name of the service to construct the
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190 ``RegionInfo`` object for, e.g. ``ec2``, ``s3``, etc.
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191 :type service_name: str
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192
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193 :param region_name: The name of the region to connect to, e.g.
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194 ``us-west-2``, ``eu-central-1``, etc.
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195 :type region_name: str
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196
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197 :param region_cls: (Optional) The class to use when constructing. By
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198 default, this is ``RegionInfo``.
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199 :type region_cls: class
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200
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201 :param connection_cls: (Optional) The connection class for the
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202 ``RegionInfo`` object. Providing this allows the ``connect`` method on
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203 the ``RegionInfo`` to work. Default is ``None`` (no connection).
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204 :type connection_cls: class
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205
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206 :returns: A configured connection class.
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207 """
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208 if region_cls is None:
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209 region_cls = RegionInfo
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210 region = _get_region(service_name, region_name, region_cls, connection_cls)
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211
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212 if region is None and _use_endpoint_heuristics():
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213 region = _get_region_with_heuristics(
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214 service_name, region_name, region_cls, connection_cls
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215 )
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216
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217 if region is None:
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218 return None
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219
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220 return region.connect(**kw_params)
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221
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222
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223 def _get_region(service_name, region_name, region_cls=None,
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224 connection_cls=None):
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225 """Finds the region by searching through the known regions."""
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226 for region in get_regions(service_name, region_cls, connection_cls):
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227 if region.name == region_name:
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228 return region
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229 return None
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230
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231
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232 def _get_region_with_heuristics(service_name, region_name, region_cls=None,
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233 connection_cls=None):
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234 """Finds the region using known regions and heuristics."""
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235 endpoints = load_endpoint_json(boto.ENDPOINTS_PATH)
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236 resolver = BotoEndpointResolver(endpoints)
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237 hostname = resolver.resolve_hostname(service_name, region_name)
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238
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239 return region_cls(
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240 name=region_name,
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241 endpoint=hostname,
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242 connection_cls=connection_cls
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243 )
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244
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245
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246 def _use_endpoint_heuristics():
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247 env_var = os.environ.get('BOTO_USE_ENDPOINT_HEURISTICS', 'false').lower()
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248 config_var = boto.config.getbool('Boto', 'use_endpoint_heuristics', False)
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249 return env_var == 'true' or config_var
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250
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251
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252 class RegionInfo(object):
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253 """
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254 Represents an AWS Region
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255 """
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256
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257 def __init__(self, connection=None, name=None, endpoint=None,
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258 connection_cls=None):
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259 self.connection = connection
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260 self.name = name
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261 self.endpoint = endpoint
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262 self.connection_cls = connection_cls
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263
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264 def __repr__(self):
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265 return 'RegionInfo:%s' % self.name
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266
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267 def startElement(self, name, attrs, connection):
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268 return None
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269
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270 def endElement(self, name, value, connection):
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271 if name == 'regionName':
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272 self.name = value
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273 elif name == 'regionEndpoint':
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274 self.endpoint = value
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275 else:
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276 setattr(self, name, value)
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277
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278 def connect(self, **kw_params):
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279 """
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280 Connect to this Region's endpoint. Returns an connection
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281 object pointing to the endpoint associated with this region.
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282 You may pass any of the arguments accepted by the connection
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283 class's constructor as keyword arguments and they will be
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284 passed along to the connection object.
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285
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286 :rtype: Connection object
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287 :return: The connection to this regions endpoint
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288 """
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289 if self.connection_cls:
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290 return self.connection_cls(region=self, **kw_params)