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annotate planemo/lib/python3.7/site-packages/boto/sdb/connection.py @ 0:d30785e31577 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:18:57 -0400
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1 # Copyright (c) 2006,2007 Mitch Garnaat http://garnaat.org/
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2 #
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3 # Permission is hereby granted, free of charge, to any person obtaining a
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4 # copy of this software and associated documentation files (the
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5 # "Software"), to deal in the Software without restriction, including
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6 # without limitation the rights to use, copy, modify, merge, publish, dis-
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7 # tribute, sublicense, and/or sell copies of the Software, and to permit
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8 # persons to whom the Software is furnished to do so, subject to the fol-
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9 # lowing conditions:
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10 #
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11 # The above copyright notice and this permission notice shall be included
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12 # in all copies or substantial portions of the Software.
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13 #
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14 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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15 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
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16 # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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17 # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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18 # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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19 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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20 # IN THE SOFTWARE.
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21 import xml.sax
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22 import threading
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23 import boto
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24 from boto import handler
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25 from boto.connection import AWSQueryConnection
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26 from boto.sdb.domain import Domain, DomainMetaData
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27 from boto.sdb.item import Item
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28 from boto.sdb.regioninfo import SDBRegionInfo
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29 from boto.exception import SDBResponseError
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30
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31 class ItemThread(threading.Thread):
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32 """
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33 A threaded :class:`Item <boto.sdb.item.Item>` retriever utility class.
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34 Retrieved :class:`Item <boto.sdb.item.Item>` objects are stored in the
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35 ``items`` instance variable after :py:meth:`run() <run>` is called.
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36
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37 .. tip:: The item retrieval will not start until
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38 the :func:`run() <boto.sdb.connection.ItemThread.run>` method is called.
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39 """
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40 def __init__(self, name, domain_name, item_names):
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41 """
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42 :param str name: A thread name. Used for identification.
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43 :param str domain_name: The name of a SimpleDB
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44 :class:`Domain <boto.sdb.domain.Domain>`
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45 :type item_names: string or list of strings
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46 :param item_names: The name(s) of the items to retrieve from the specified
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47 :class:`Domain <boto.sdb.domain.Domain>`.
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48 :ivar list items: A list of items retrieved. Starts as empty list.
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49 """
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50 super(ItemThread, self).__init__(name=name)
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51 #print 'starting %s with %d items' % (name, len(item_names))
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52 self.domain_name = domain_name
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53 self.conn = SDBConnection()
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54 self.item_names = item_names
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55 self.items = []
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56
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57 def run(self):
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58 """
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59 Start the threaded retrieval of items. Populates the
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60 ``items`` list with :class:`Item <boto.sdb.item.Item>` objects.
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61 """
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62 for item_name in self.item_names:
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63 item = self.conn.get_attributes(self.domain_name, item_name)
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64 self.items.append(item)
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65
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66 #boto.set_stream_logger('sdb')
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67
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68 class SDBConnection(AWSQueryConnection):
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69 """
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70 This class serves as a gateway to your SimpleDB region (defaults to
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71 us-east-1). Methods within allow access to SimpleDB
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72 :class:`Domain <boto.sdb.domain.Domain>` objects and their associated
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73 :class:`Item <boto.sdb.item.Item>` objects.
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74
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75 .. tip::
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76 While you may instantiate this class directly, it may be easier to
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77 go through :py:func:`boto.connect_sdb`.
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78 """
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79 DefaultRegionName = 'us-east-1'
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80 DefaultRegionEndpoint = 'sdb.us-east-1.amazonaws.com'
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81 APIVersion = '2009-04-15'
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82 ResponseError = SDBResponseError
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83
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84 def __init__(self, aws_access_key_id=None, aws_secret_access_key=None,
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85 is_secure=True, port=None, proxy=None, proxy_port=None,
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86 proxy_user=None, proxy_pass=None, debug=0,
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87 https_connection_factory=None, region=None, path='/',
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88 converter=None, security_token=None, validate_certs=True,
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89 profile_name=None):
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90 """
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91 For any keywords that aren't documented, refer to the parent class,
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92 :py:class:`boto.connection.AWSAuthConnection`. You can avoid having
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93 to worry about these keyword arguments by instantiating these objects
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94 via :py:func:`boto.connect_sdb`.
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95
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96 :type region: :class:`boto.sdb.regioninfo.SDBRegionInfo`
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97 :keyword region: Explicitly specify a region. Defaults to ``us-east-1``
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98 if not specified. You may also specify the region in your ``boto.cfg``:
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99
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100 .. code-block:: cfg
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101
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102 [SDB]
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103 region = eu-west-1
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104
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105 """
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106 if not region:
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107 region_name = boto.config.get('SDB', 'region', self.DefaultRegionName)
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108 for reg in boto.sdb.regions():
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109 if reg.name == region_name:
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110 region = reg
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111 break
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112
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113 self.region = region
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114 super(SDBConnection, self).__init__(aws_access_key_id,
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115 aws_secret_access_key,
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116 is_secure, port, proxy,
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117 proxy_port, proxy_user, proxy_pass,
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118 self.region.endpoint, debug,
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119 https_connection_factory, path,
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120 security_token=security_token,
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121 validate_certs=validate_certs,
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122 profile_name=profile_name)
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123 self.box_usage = 0.0
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124 self.converter = converter
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125 self.item_cls = Item
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126
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127 def _required_auth_capability(self):
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128 return ['sdb']
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129
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130 def set_item_cls(self, cls):
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131 """
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132 While the default item class is :py:class:`boto.sdb.item.Item`, this
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133 default may be overridden. Use this method to change a connection's
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134 item class.
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135
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136 :param object cls: The new class to set as this connection's item
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137 class. See the default item class for inspiration as to what your
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138 replacement should/could look like.
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139 """
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140 self.item_cls = cls
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141
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142 def _build_name_value_list(self, params, attributes, replace=False,
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143 label='Attribute'):
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144 keys = sorted(attributes.keys())
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145 i = 1
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146 for key in keys:
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147 value = attributes[key]
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148 if isinstance(value, list):
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149 for v in value:
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150 params['%s.%d.Name' % (label, i)] = key
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151 if self.converter:
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152 v = self.converter.encode(v)
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153 params['%s.%d.Value' % (label, i)] = v
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154 if replace:
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155 params['%s.%d.Replace' % (label, i)] = 'true'
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156 i += 1
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157 else:
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158 params['%s.%d.Name' % (label, i)] = key
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159 if self.converter:
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160 value = self.converter.encode(value)
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161 params['%s.%d.Value' % (label, i)] = value
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162 if replace:
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163 params['%s.%d.Replace' % (label, i)] = 'true'
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164 i += 1
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165
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166 def _build_expected_value(self, params, expected_value):
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167 params['Expected.1.Name'] = expected_value[0]
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168 if expected_value[1] is True:
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169 params['Expected.1.Exists'] = 'true'
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170 elif expected_value[1] is False:
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171 params['Expected.1.Exists'] = 'false'
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172 else:
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173 params['Expected.1.Value'] = expected_value[1]
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174
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175 def _build_batch_list(self, params, items, replace=False):
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176 item_names = items.keys()
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177 i = 0
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178 for item_name in item_names:
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179 params['Item.%d.ItemName' % i] = item_name
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180 j = 0
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181 item = items[item_name]
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182 if item is not None:
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183 attr_names = item.keys()
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184 for attr_name in attr_names:
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185 value = item[attr_name]
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186 if isinstance(value, list):
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187 for v in value:
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188 if self.converter:
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189 v = self.converter.encode(v)
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190 params['Item.%d.Attribute.%d.Name' % (i, j)] = attr_name
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191 params['Item.%d.Attribute.%d.Value' % (i, j)] = v
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192 if replace:
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193 params['Item.%d.Attribute.%d.Replace' % (i, j)] = 'true'
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194 j += 1
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195 else:
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196 params['Item.%d.Attribute.%d.Name' % (i, j)] = attr_name
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197 if self.converter:
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198 value = self.converter.encode(value)
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199 params['Item.%d.Attribute.%d.Value' % (i, j)] = value
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200 if replace:
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201 params['Item.%d.Attribute.%d.Replace' % (i, j)] = 'true'
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202 j += 1
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203 i += 1
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204
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205 def _build_name_list(self, params, attribute_names):
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206 i = 1
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207 attribute_names.sort()
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208 for name in attribute_names:
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209 params['Attribute.%d.Name' % i] = name
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210 i += 1
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211
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212 def get_usage(self):
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213 """
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214 Returns the BoxUsage (in USD) accumulated on this specific SDBConnection
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215 instance.
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216
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217 .. tip:: This can be out of date, and should only be treated as a
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218 rough estimate. Also note that this estimate only applies to the
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219 requests made on this specific connection instance. It is by
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220 no means an account-wide estimate.
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221
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222 :rtype: float
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223 :return: The accumulated BoxUsage of all requests made on the connection.
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224 """
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225 return self.box_usage
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226
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227 def print_usage(self):
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228 """
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229 Print the BoxUsage and approximate costs of all requests made on
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230 this specific SDBConnection instance.
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231
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232 .. tip:: This can be out of date, and should only be treated as a
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233 rough estimate. Also note that this estimate only applies to the
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234 requests made on this specific connection instance. It is by
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235 no means an account-wide estimate.
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236 """
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237 print('Total Usage: %f compute seconds' % self.box_usage)
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238 cost = self.box_usage * 0.14
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239 print('Approximate Cost: $%f' % cost)
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240
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241 def get_domain(self, domain_name, validate=True):
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242 """
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243 Retrieves a :py:class:`boto.sdb.domain.Domain` object whose name
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244 matches ``domain_name``.
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245
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246 :param str domain_name: The name of the domain to retrieve
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247 :keyword bool validate: When ``True``, check to see if the domain
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248 actually exists. If ``False``, blindly return a
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249 :py:class:`Domain <boto.sdb.domain.Domain>` object with the
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250 specified name set.
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251
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252 :raises:
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253 :py:class:`boto.exception.SDBResponseError` if ``validate`` is
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254 ``True`` and no match could be found.
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255
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256 :rtype: :py:class:`boto.sdb.domain.Domain`
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257 :return: The requested domain
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258 """
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259 domain = Domain(self, domain_name)
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260 if validate:
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261 self.select(domain, """select * from `%s` limit 1""" % domain_name)
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262 return domain
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263
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264 def lookup(self, domain_name, validate=True):
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265 """
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266 Lookup an existing SimpleDB domain. This differs from
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267 :py:meth:`get_domain` in that ``None`` is returned if ``validate`` is
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268 ``True`` and no match was found (instead of raising an exception).
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269
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270 :param str domain_name: The name of the domain to retrieve
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271
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272 :param bool validate: If ``True``, a ``None`` value will be returned
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273 if the specified domain can't be found. If ``False``, a
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274 :py:class:`Domain <boto.sdb.domain.Domain>` object will be dumbly
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275 returned, regardless of whether it actually exists.
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276
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277 :rtype: :class:`boto.sdb.domain.Domain` object or ``None``
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278 :return: The Domain object or ``None`` if the domain does not exist.
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279 """
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280 try:
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281 domain = self.get_domain(domain_name, validate)
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282 except:
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283 domain = None
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284 return domain
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285
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286 def get_all_domains(self, max_domains=None, next_token=None):
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287 """
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288 Returns a :py:class:`boto.resultset.ResultSet` containing
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289 all :py:class:`boto.sdb.domain.Domain` objects associated with
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290 this connection's Access Key ID.
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291
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292 :keyword int max_domains: Limit the returned
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293 :py:class:`ResultSet <boto.resultset.ResultSet>` to the specified
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294 number of members.
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295 :keyword str next_token: A token string that was returned in an
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296 earlier call to this method as the ``next_token`` attribute
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297 on the returned :py:class:`ResultSet <boto.resultset.ResultSet>`
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298 object. This attribute is set if there are more than Domains than
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299 the value specified in the ``max_domains`` keyword. Pass the
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300 ``next_token`` value from you earlier query in this keyword to
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301 get the next 'page' of domains.
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302 """
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303 params = {}
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304 if max_domains:
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305 params['MaxNumberOfDomains'] = max_domains
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306 if next_token:
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307 params['NextToken'] = next_token
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308 return self.get_list('ListDomains', params, [('DomainName', Domain)])
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309
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310 def create_domain(self, domain_name):
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311 """
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312 Create a SimpleDB domain.
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313
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314 :type domain_name: string
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315 :param domain_name: The name of the new domain
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316
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317 :rtype: :class:`boto.sdb.domain.Domain` object
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318 :return: The newly created domain
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319 """
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320 params = {'DomainName': domain_name}
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321 d = self.get_object('CreateDomain', params, Domain)
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322 d.name = domain_name
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323 return d
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324
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325 def get_domain_and_name(self, domain_or_name):
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326 """
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327 Given a ``str`` or :class:`boto.sdb.domain.Domain`, return a
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328 ``tuple`` with the following members (in order):
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329
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330 * In instance of :class:`boto.sdb.domain.Domain` for the requested
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331 domain
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332 * The domain's name as a ``str``
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333
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334 :type domain_or_name: ``str`` or :class:`boto.sdb.domain.Domain`
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335 :param domain_or_name: The domain or domain name to get the domain
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336 and name for.
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337
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338 :raises: :class:`boto.exception.SDBResponseError` when an invalid
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339 domain name is specified.
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340
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341 :rtype: tuple
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342 :return: A ``tuple`` with contents outlined as per above.
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343 """
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344 if (isinstance(domain_or_name, Domain)):
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345 return (domain_or_name, domain_or_name.name)
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346 else:
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347 return (self.get_domain(domain_or_name), domain_or_name)
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348
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349 def delete_domain(self, domain_or_name):
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350 """
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351 Delete a SimpleDB domain.
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352
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353 .. caution:: This will delete the domain and all items within the domain.
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354
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355 :type domain_or_name: string or :class:`boto.sdb.domain.Domain` object.
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356 :param domain_or_name: Either the name of a domain or a Domain object
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357
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358 :rtype: bool
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359 :return: True if successful
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360
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361 """
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362 domain, domain_name = self.get_domain_and_name(domain_or_name)
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363 params = {'DomainName': domain_name}
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364 return self.get_status('DeleteDomain', params)
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365
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366 def domain_metadata(self, domain_or_name):
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367 """
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368 Get the Metadata for a SimpleDB domain.
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369
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370 :type domain_or_name: string or :class:`boto.sdb.domain.Domain` object.
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371 :param domain_or_name: Either the name of a domain or a Domain object
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372
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373 :rtype: :class:`boto.sdb.domain.DomainMetaData` object
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374 :return: The newly created domain metadata object
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375 """
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376 domain, domain_name = self.get_domain_and_name(domain_or_name)
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377 params = {'DomainName': domain_name}
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378 d = self.get_object('DomainMetadata', params, DomainMetaData)
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379 d.domain = domain
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380 return d
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381
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382 def put_attributes(self, domain_or_name, item_name, attributes,
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383 replace=True, expected_value=None):
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384 """
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385 Store attributes for a given item in a domain.
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386
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387 :type domain_or_name: string or :class:`boto.sdb.domain.Domain` object.
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388 :param domain_or_name: Either the name of a domain or a Domain object
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389
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390 :type item_name: string
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391 :param item_name: The name of the item whose attributes are being
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392 stored.
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393
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394 :type attribute_names: dict or dict-like object
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395 :param attribute_names: The name/value pairs to store as attributes
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396
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397 :type expected_value: list
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398 :param expected_value: If supplied, this is a list or tuple consisting
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399 of a single attribute name and expected value. The list can be
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400 of the form:
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401
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402 * ['name', 'value']
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403
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404 In which case the call will first verify that the attribute "name"
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405 of this item has a value of "value". If it does, the delete
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406 will proceed, otherwise a ConditionalCheckFailed error will be
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407 returned. The list can also be of the form:
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408
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409 * ['name', True|False]
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410
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411 which will simply check for the existence (True) or
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412 non-existence (False) of the attribute.
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413
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414 :type replace: bool
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415 :param replace: Whether the attribute values passed in will replace
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416 existing values or will be added as addition values.
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417 Defaults to True.
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418
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419 :rtype: bool
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420 :return: True if successful
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421 """
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422 domain, domain_name = self.get_domain_and_name(domain_or_name)
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423 params = {'DomainName': domain_name,
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424 'ItemName': item_name}
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425 self._build_name_value_list(params, attributes, replace)
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426 if expected_value:
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427 self._build_expected_value(params, expected_value)
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428 return self.get_status('PutAttributes', params)
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429
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430 def batch_put_attributes(self, domain_or_name, items, replace=True):
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431 """
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432 Store attributes for multiple items in a domain.
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433
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434 :type domain_or_name: string or :class:`boto.sdb.domain.Domain` object.
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435 :param domain_or_name: Either the name of a domain or a Domain object
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436
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437 :type items: dict or dict-like object
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438 :param items: A dictionary-like object. The keys of the dictionary are
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439 the item names and the values are themselves dictionaries
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440 of attribute names/values, exactly the same as the
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441 attribute_names parameter of the scalar put_attributes
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442 call.
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443
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444 :type replace: bool
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445 :param replace: Whether the attribute values passed in will replace
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446 existing values or will be added as addition values.
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447 Defaults to True.
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448
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449 :rtype: bool
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450 :return: True if successful
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451 """
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452 domain, domain_name = self.get_domain_and_name(domain_or_name)
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453 params = {'DomainName': domain_name}
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454 self._build_batch_list(params, items, replace)
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455 return self.get_status('BatchPutAttributes', params, verb='POST')
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456
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457 def get_attributes(self, domain_or_name, item_name, attribute_names=None,
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458 consistent_read=False, item=None):
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459 """
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460 Retrieve attributes for a given item in a domain.
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461
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462 :type domain_or_name: string or :class:`boto.sdb.domain.Domain` object.
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463 :param domain_or_name: Either the name of a domain or a Domain object
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464
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465 :type item_name: string
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466 :param item_name: The name of the item whose attributes are
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467 being retrieved.
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468
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469 :type attribute_names: string or list of strings
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470 :param attribute_names: An attribute name or list of attribute names.
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471 This parameter is optional. If not supplied, all attributes will
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472 be retrieved for the item.
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473
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474 :type consistent_read: bool
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475 :param consistent_read: When set to true, ensures that the most recent
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476 data is returned.
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477
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478 :type item: :class:`boto.sdb.item.Item`
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479 :keyword item: Instead of instantiating a new Item object, you may
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480 specify one to update.
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481
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482 :rtype: :class:`boto.sdb.item.Item`
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483 :return: An Item with the requested attribute name/values set on it
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484 """
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485 domain, domain_name = self.get_domain_and_name(domain_or_name)
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486 params = {'DomainName': domain_name,
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487 'ItemName': item_name}
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488 if consistent_read:
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489 params['ConsistentRead'] = 'true'
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490 if attribute_names:
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491 if not isinstance(attribute_names, list):
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492 attribute_names = [attribute_names]
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493 self.build_list_params(params, attribute_names, 'AttributeName')
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494 response = self.make_request('GetAttributes', params)
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495 body = response.read()
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496 if response.status == 200:
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497 if item is None:
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498 item = self.item_cls(domain, item_name)
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499 h = handler.XmlHandler(item, self)
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500 xml.sax.parseString(body, h)
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501 return item
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502 else:
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503 raise SDBResponseError(response.status, response.reason, body)
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504
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505 def delete_attributes(self, domain_or_name, item_name, attr_names=None,
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506 expected_value=None):
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507 """
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508 Delete attributes from a given item in a domain.
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509
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510 :type domain_or_name: string or :class:`boto.sdb.domain.Domain` object.
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511 :param domain_or_name: Either the name of a domain or a Domain object
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512
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513 :type item_name: string
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514 :param item_name: The name of the item whose attributes are being
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515 deleted.
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516
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517 :type attributes: dict, list or :class:`boto.sdb.item.Item`
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518 :param attributes: Either a list containing attribute names which
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519 will cause all values associated with that attribute
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520 name to be deleted or a dict or Item containing the
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521 attribute names and keys and list of values to
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522 delete as the value. If no value is supplied,
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523 all attribute name/values for the item will be
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524 deleted.
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525
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526 :type expected_value: list
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527 :param expected_value: If supplied, this is a list or tuple consisting
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528 of a single attribute name and expected value. The list can be
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529 of the form:
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530
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531 * ['name', 'value']
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532
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533 In which case the call will first verify that the attribute "name"
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534 of this item has a value of "value". If it does, the delete
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535 will proceed, otherwise a ConditionalCheckFailed error will be
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536 returned. The list can also be of the form:
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537
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538 * ['name', True|False]
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539
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540 which will simply check for the existence (True) or
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541 non-existence (False) of the attribute.
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542
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543 :rtype: bool
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544 :return: True if successful
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545 """
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546 domain, domain_name = self.get_domain_and_name(domain_or_name)
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547 params = {'DomainName': domain_name,
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548 'ItemName': item_name}
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549 if attr_names:
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550 if isinstance(attr_names, list):
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551 self._build_name_list(params, attr_names)
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552 elif isinstance(attr_names, dict) or isinstance(attr_names, self.item_cls):
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553 self._build_name_value_list(params, attr_names)
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554 if expected_value:
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555 self._build_expected_value(params, expected_value)
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556 return self.get_status('DeleteAttributes', params)
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557
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558 def batch_delete_attributes(self, domain_or_name, items):
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559 """
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560 Delete multiple items in a domain.
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561
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562 :type domain_or_name: string or :class:`boto.sdb.domain.Domain` object.
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563 :param domain_or_name: Either the name of a domain or a Domain object
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564
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565 :type items: dict or dict-like object
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566 :param items: A dictionary-like object. The keys of the dictionary are
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567 the item names and the values are either:
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568
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569 * dictionaries of attribute names/values, exactly the
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570 same as the attribute_names parameter of the scalar
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571 put_attributes call. The attribute name/value pairs
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572 will only be deleted if they match the name/value
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573 pairs passed in.
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574 * None which means that all attributes associated
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575 with the item should be deleted.
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576
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577 :return: True if successful
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578 """
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579 domain, domain_name = self.get_domain_and_name(domain_or_name)
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580 params = {'DomainName': domain_name}
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581 self._build_batch_list(params, items, False)
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582 return self.get_status('BatchDeleteAttributes', params, verb='POST')
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583
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584 def select(self, domain_or_name, query='', next_token=None,
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585 consistent_read=False):
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586 """
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587 Returns a set of Attributes for item names within domain_name that
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588 match the query. The query must be expressed in using the SELECT
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589 style syntax rather than the original SimpleDB query language.
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590 Even though the select request does not require a domain object,
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591 a domain object must be passed into this method so the Item objects
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592 returned can point to the appropriate domain.
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593
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594 :type domain_or_name: string or :class:`boto.sdb.domain.Domain` object
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595 :param domain_or_name: Either the name of a domain or a Domain object
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596
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597 :type query: string
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598 :param query: The SimpleDB query to be performed.
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599
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600 :type consistent_read: bool
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601 :param consistent_read: When set to true, ensures that the most recent
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602 data is returned.
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603
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604 :rtype: ResultSet
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605 :return: An iterator containing the results.
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606 """
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607 domain, domain_name = self.get_domain_and_name(domain_or_name)
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608 params = {'SelectExpression': query}
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609 if consistent_read:
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610 params['ConsistentRead'] = 'true'
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611 if next_token:
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612 params['NextToken'] = next_token
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613 try:
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614 return self.get_list('Select', params, [('Item', self.item_cls)],
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615 parent=domain)
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616 except SDBResponseError as e:
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617 e.body = "Query: %s\n%s" % (query, e.body)
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618 raise e