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annotate planemo/lib/python3.7/site-packages/boto/vendored/regions/regions.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
parents d30785e31577
children
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1 # Copyright 2014 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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2 #
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3 # Licensed under the Apache License, Version 2.0 (the "License"). You
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4 # may not use this file except in compliance with the License. A copy of
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5 # the License is located at
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6 #
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7 # http://aws.amazon.com/apache2.0/
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8 #
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9 # or in the "license" file accompanying this file. This file is
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10 # distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
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11 # ANY KIND, either express or implied. See the License for the specific
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12 # language governing permissions and limitations under the License.
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13 """Resolves regions and endpoints.
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14
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15 This module implements endpoint resolution, including resolving endpoints for a
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16 given service and region and resolving the available endpoints for a service
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17 in a specific AWS partition.
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18 """
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19 import logging
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20 import re
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21
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22 from boto.vendored.regions.exceptions import NoRegionError
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23
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24 LOG = logging.getLogger(__name__)
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25 DEFAULT_URI_TEMPLATE = '{service}.{region}.{dnsSuffix}'
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26 DEFAULT_SERVICE_DATA = {'endpoints': {}}
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27
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28
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29 class BaseEndpointResolver(object):
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30 """Resolves regions and endpoints. Must be subclassed."""
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31 def construct_endpoint(self, service_name, region_name=None):
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32 """Resolves an endpoint for a service and region combination.
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33
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34 :type service_name: string
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35 :param service_name: Name of the service to resolve an endpoint for
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36 (e.g., s3)
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37
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38 :type region_name: string
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39 :param region_name: Region/endpoint name to resolve (e.g., us-east-1)
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40 if no region is provided, the first found partition-wide endpoint
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41 will be used if available.
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42
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43 :rtype: dict
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44 :return: Returns a dict containing the following keys:
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45 - partition: (string, required) Resolved partition name
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46 - endpointName: (string, required) Resolved endpoint name
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47 - hostname: (string, required) Hostname to use for this endpoint
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48 - sslCommonName: (string) sslCommonName to use for this endpoint.
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49 - credentialScope: (dict) Signature version 4 credential scope
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50 - region: (string) region name override when signing.
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51 - service: (string) service name override when signing.
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52 - signatureVersions: (list<string>) A list of possible signature
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53 versions, including s3, v4, v2, and s3v4
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54 - protocols: (list<string>) A list of supported protocols
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55 (e.g., http, https)
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56 - ...: Other keys may be included as well based on the metadata
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57 """
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58 raise NotImplementedError
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59
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60 def get_available_partitions(self):
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61 """Lists the partitions available to the endpoint resolver.
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62
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63 :return: Returns a list of partition names (e.g., ["aws", "aws-cn"]).
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64 """
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65 raise NotImplementedError
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66
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67 def get_available_endpoints(self, service_name, partition_name='aws',
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68 allow_non_regional=False):
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69 """Lists the endpoint names of a particular partition.
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70
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71 :type service_name: string
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72 :param service_name: Name of a service to list endpoint for (e.g., s3)
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73
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74 :type partition_name: string
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75 :param partition_name: Name of the partition to limit endpoints to.
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76 (e.g., aws for the public AWS endpoints, aws-cn for AWS China
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77 endpoints, aws-us-gov for AWS GovCloud (US) Endpoints, etc.
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78
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79 :type allow_non_regional: bool
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80 :param allow_non_regional: Set to True to include endpoints that are
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81 not regional endpoints (e.g., s3-external-1,
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82 fips-us-gov-west-1, etc).
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83 :return: Returns a list of endpoint names (e.g., ["us-east-1"]).
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84 """
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85 raise NotImplementedError
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86
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87
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88 class EndpointResolver(BaseEndpointResolver):
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89 """Resolves endpoints based on partition endpoint metadata"""
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90 def __init__(self, endpoint_data):
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91 """
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92 :param endpoint_data: A dict of partition data.
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93 """
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94 if 'partitions' not in endpoint_data:
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95 raise ValueError('Missing "partitions" in endpoint data')
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96 self._endpoint_data = endpoint_data
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97
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98 def get_available_partitions(self):
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99 result = []
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100 for partition in self._endpoint_data['partitions']:
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101 result.append(partition['partition'])
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102 return result
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103
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104 def get_available_endpoints(self, service_name, partition_name='aws',
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105 allow_non_regional=False):
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106 result = []
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107 for partition in self._endpoint_data['partitions']:
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108 if partition['partition'] != partition_name:
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109 continue
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110 services = partition['services']
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111 if service_name not in services:
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112 continue
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113 for endpoint_name in services[service_name]['endpoints']:
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114 if allow_non_regional or endpoint_name in partition['regions']:
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115 result.append(endpoint_name)
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116 return result
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117
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118 def construct_endpoint(self, service_name, region_name=None):
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119 # Iterate over each partition until a match is found.
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120 for partition in self._endpoint_data['partitions']:
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121 result = self._endpoint_for_partition(
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122 partition, service_name, region_name)
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123 if result:
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124 return result
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125
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126 def _endpoint_for_partition(self, partition, service_name, region_name):
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127 # Get the service from the partition, or an empty template.
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128 service_data = partition['services'].get(
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129 service_name, DEFAULT_SERVICE_DATA)
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130 # Use the partition endpoint if no region is supplied.
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131 if region_name is None:
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132 if 'partitionEndpoint' in service_data:
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133 region_name = service_data['partitionEndpoint']
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134 else:
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135 raise NoRegionError()
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136 # Attempt to resolve the exact region for this partition.
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137 if region_name in service_data['endpoints']:
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138 return self._resolve(
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139 partition, service_name, service_data, region_name)
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140 # Check to see if the endpoint provided is valid for the partition.
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141 if self._region_match(partition, region_name):
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142 # Use the partition endpoint if set and not regionalized.
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143 partition_endpoint = service_data.get('partitionEndpoint')
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144 is_regionalized = service_data.get('isRegionalized', True)
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145 if partition_endpoint and not is_regionalized:
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146 LOG.debug('Using partition endpoint for %s, %s: %s',
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147 service_name, region_name, partition_endpoint)
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148 return self._resolve(
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149 partition, service_name, service_data, partition_endpoint)
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150 LOG.debug('Creating a regex based endpoint for %s, %s',
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151 service_name, region_name)
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152 return self._resolve(
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153 partition, service_name, service_data, region_name)
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154
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155 def _region_match(self, partition, region_name):
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156 if region_name in partition['regions']:
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157 return True
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158 if 'regionRegex' in partition:
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159 return re.compile(partition['regionRegex']).match(region_name)
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160 return False
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161
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162 def _resolve(self, partition, service_name, service_data, endpoint_name):
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163 result = service_data['endpoints'].get(endpoint_name, {})
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164 result['partition'] = partition['partition']
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165 result['endpointName'] = endpoint_name
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166 # Merge in the service defaults then the partition defaults.
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167 self._merge_keys(service_data.get('defaults', {}), result)
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168 self._merge_keys(partition.get('defaults', {}), result)
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169 hostname = result.get('hostname', DEFAULT_URI_TEMPLATE)
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170 result['hostname'] = self._expand_template(
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171 partition, result['hostname'], service_name, endpoint_name)
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172 if 'sslCommonName' in result:
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173 result['sslCommonName'] = self._expand_template(
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174 partition, result['sslCommonName'], service_name,
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175 endpoint_name)
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176 result['dnsSuffix'] = partition['dnsSuffix']
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177 return result
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178
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179 def _merge_keys(self, from_data, result):
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180 for key in from_data:
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181 if key not in result:
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182 result[key] = from_data[key]
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183
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184 def _expand_template(self, partition, template, service_name,
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185 endpoint_name):
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186 return template.format(
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187 service=service_name, region=endpoint_name,
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188 dnsSuffix=partition['dnsSuffix'])