Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/boto/regioninfo.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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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
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29
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30 def load_endpoint_json(path):
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31 """
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32 Loads a given JSON file & returns it.
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33
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34 :param path: The path to the JSON file
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35 :type path: string
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36
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37 :returns: The loaded data
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38 """
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39 with open(path, 'r') as endpoints_file:
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40 return json.load(endpoints_file)
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41
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42
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43 def merge_endpoints(defaults, additions):
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44 """
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45 Given an existing set of endpoint data, this will deep-update it with
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46 any similarly structured data in the additions.
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47
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48 :param defaults: The existing endpoints data
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49 :type defaults: dict
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50
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51 :param defaults: The additional endpoints data
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52 :type defaults: dict
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53
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54 :returns: The modified endpoints data
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55 :rtype: dict
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56 """
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57 # We can't just do an ``defaults.update(...)`` here, as that could
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58 # *overwrite* regions if present in both.
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59 # We'll iterate instead, essentially doing a deeper merge.
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60 for service, region_info in additions.items():
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61 # Set the default, if not present, to an empty dict.
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62 defaults.setdefault(service, {})
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63 defaults[service].update(region_info)
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64
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65 return defaults
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66
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67
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68 def load_regions():
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69 """
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70 Actually load the region/endpoint information from the JSON files.
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71
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72 By default, this loads from the default included ``boto/endpoints.json``
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73 file.
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74
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75 Users can override/extend this by supplying either a ``BOTO_ENDPOINTS``
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76 environment variable or a ``endpoints_path`` config variable, either of
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77 which should be an absolute path to the user's JSON file.
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78
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79 :returns: The endpoints data
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80 :rtype: dict
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81 """
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82 # Load the defaults first.
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83 endpoints = load_endpoint_json(boto.ENDPOINTS_PATH)
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84 additional_path = None
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85
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86 # Try the ENV var. If not, check the config file.
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87 if os.environ.get('BOTO_ENDPOINTS'):
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88 additional_path = os.environ['BOTO_ENDPOINTS']
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89 elif boto.config.get('Boto', 'endpoints_path'):
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90 additional_path = boto.config.get('Boto', 'endpoints_path')
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91
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92 # If there's a file provided, we'll load it & additively merge it into
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93 # the endpoints.
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94 if additional_path:
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95 additional = load_endpoint_json(additional_path)
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96 endpoints = merge_endpoints(endpoints, additional)
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97
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98 return endpoints
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99
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100
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101 def get_regions(service_name, region_cls=None, connection_cls=None):
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102 """
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103 Given a service name (like ``ec2``), returns a list of ``RegionInfo``
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104 objects for that service.
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105
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106 This leverages the ``endpoints.json`` file (+ optional user overrides) to
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107 configure/construct all the objects.
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108
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109 :param service_name: The name of the service to construct the ``RegionInfo``
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110 objects for. Ex: ``ec2``, ``s3``, ``sns``, etc.
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111 :type service_name: string
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112
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113 :param region_cls: (Optional) The class to use when constructing. By
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114 default, this is ``RegionInfo``.
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115 :type region_cls: class
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116
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117 :param connection_cls: (Optional) The connection class for the
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118 ``RegionInfo`` object. Providing this allows the ``connect`` method on
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119 the ``RegionInfo`` to work. Default is ``None`` (no connection).
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120 :type connection_cls: class
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121
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122 :returns: A list of configured ``RegionInfo`` objects
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123 :rtype: list
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124 """
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125 endpoints = load_regions()
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126
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127 if service_name not in endpoints:
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128 raise BotoClientError(
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129 "Service '%s' not found in endpoints." % service_name
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130 )
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131
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132 if region_cls is None:
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133 region_cls = RegionInfo
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134
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135 region_objs = []
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136
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137 for region_name, endpoint in endpoints.get(service_name, {}).items():
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138 region_objs.append(
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139 region_cls(
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140 name=region_name,
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141 endpoint=endpoint,
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142 connection_cls=connection_cls
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143 )
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144 )
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145
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146 return region_objs
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147
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148
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149 class RegionInfo(object):
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150 """
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151 Represents an AWS Region
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152 """
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153
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154 def __init__(self, connection=None, name=None, endpoint=None,
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155 connection_cls=None):
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156 self.connection = connection
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157 self.name = name
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158 self.endpoint = endpoint
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159 self.connection_cls = connection_cls
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160
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161 def __repr__(self):
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162 return 'RegionInfo:%s' % self.name
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163
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164 def startElement(self, name, attrs, connection):
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165 return None
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166
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167 def endElement(self, name, value, connection):
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168 if name == 'regionName':
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169 self.name = value
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170 elif name == 'regionEndpoint':
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171 self.endpoint = value
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172 else:
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173 setattr(self, name, value)
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174
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175 def connect(self, **kw_params):
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176 """
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177 Connect to this Region's endpoint. Returns an connection
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178 object pointing to the endpoint associated with this region.
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179 You may pass any of the arguments accepted by the connection
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180 class's constructor as keyword arguments and they will be
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181 passed along to the connection object.
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182
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183 :rtype: Connection object
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184 :return: The connection to this regions endpoint
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185 """
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186 if self.connection_cls:
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187 return self.connection_cls(region=self, **kw_params)