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annotate planemo/lib/python3.7/site-packages/boto/dynamodb/table.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
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1 # Copyright (c) 2012 Mitch Garnaat http://garnaat.org/
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2 # Copyright (c) 2012 Amazon.com, Inc. or its affiliates. All Rights Reserved
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3 #
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4 # Permission is hereby granted, free of charge, to any person obtaining a
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5 # copy of this software and associated documentation files (the
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6 # "Software"), to deal in the Software without restriction, including
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7 # without limitation the rights to use, copy, modify, merge, publish, dis-
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8 # tribute, sublicense, and/or sell copies of the Software, and to permit
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9 # persons to whom the Software is furnished to do so, subject to the fol-
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10 # lowing conditions:
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11 #
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12 # The above copyright notice and this permission notice shall be included
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13 # in all copies or substantial portions of the Software.
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14 #
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15 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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16 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABIL-
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17 # ITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
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18 # SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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19 # WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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20 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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21 # IN THE SOFTWARE.
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22 #
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23
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24 from boto.dynamodb.batch import BatchList
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25 from boto.dynamodb.schema import Schema
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26 from boto.dynamodb.item import Item
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27 from boto.dynamodb import exceptions as dynamodb_exceptions
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28 import time
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29
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30
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31 class TableBatchGenerator(object):
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32 """
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33 A low-level generator used to page through results from
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34 batch_get_item operations.
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35
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36 :ivar consumed_units: An integer that holds the number of
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37 ConsumedCapacityUnits accumulated thus far for this
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38 generator.
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39 """
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40
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41 def __init__(self, table, keys, attributes_to_get=None,
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42 consistent_read=False):
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43 self.table = table
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44 self.keys = keys
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45 self.consumed_units = 0
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46 self.attributes_to_get = attributes_to_get
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47 self.consistent_read = consistent_read
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48
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49 def _queue_unprocessed(self, res):
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50 if u'UnprocessedKeys' not in res:
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51 return
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52 if self.table.name not in res[u'UnprocessedKeys']:
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53 return
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54
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55 keys = res[u'UnprocessedKeys'][self.table.name][u'Keys']
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56
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57 for key in keys:
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58 h = key[u'HashKeyElement']
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59 r = key[u'RangeKeyElement'] if u'RangeKeyElement' in key else None
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60 self.keys.append((h, r))
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61
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62 def __iter__(self):
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63 while self.keys:
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64 # Build the next batch
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65 batch = BatchList(self.table.layer2)
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66 batch.add_batch(self.table, self.keys[:100],
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67 self.attributes_to_get)
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68 res = batch.submit()
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69
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70 # parse the results
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71 if self.table.name not in res[u'Responses']:
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72 continue
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73 self.consumed_units += res[u'Responses'][self.table.name][u'ConsumedCapacityUnits']
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74 for elem in res[u'Responses'][self.table.name][u'Items']:
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75 yield elem
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76
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77 # re-queue un processed keys
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78 self.keys = self.keys[100:]
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79 self._queue_unprocessed(res)
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80
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81
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82 class Table(object):
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83 """
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84 An Amazon DynamoDB table.
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85
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86 :ivar name: The name of the table.
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87 :ivar create_time: The date and time that the table was created.
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88 :ivar status: The current status of the table. One of:
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89 'ACTIVE', 'UPDATING', 'DELETING'.
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90 :ivar schema: A :class:`boto.dynamodb.schema.Schema` object representing
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91 the schema defined for the table.
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92 :ivar item_count: The number of items in the table. This value is
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93 set only when the Table object is created or refreshed and
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94 may not reflect the actual count.
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95 :ivar size_bytes: Total size of the specified table, in bytes.
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96 Amazon DynamoDB updates this value approximately every six hours.
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97 Recent changes might not be reflected in this value.
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98 :ivar read_units: The ReadCapacityUnits of the tables
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99 Provisioned Throughput.
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100 :ivar write_units: The WriteCapacityUnits of the tables
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101 Provisioned Throughput.
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102 :ivar schema: The Schema object associated with the table.
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103 """
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104
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105 def __init__(self, layer2, response):
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106 """
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107
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108 :type layer2: :class:`boto.dynamodb.layer2.Layer2`
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109 :param layer2: A `Layer2` api object.
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110
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111 :type response: dict
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112 :param response: The output of
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113 `boto.dynamodb.layer1.Layer1.describe_table`.
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114
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115 """
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116 self.layer2 = layer2
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117 self._dict = {}
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118 self.update_from_response(response)
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119
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120 @classmethod
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121 def create_from_schema(cls, layer2, name, schema):
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122 """Create a Table object.
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123
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124 If you know the name and schema of your table, you can
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125 create a ``Table`` object without having to make any
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126 API calls (normally an API call is made to retrieve
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127 the schema of a table).
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128
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129 Example usage::
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130
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131 table = Table.create_from_schema(
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132 boto.connect_dynamodb(),
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133 'tablename',
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134 Schema.create(hash_key=('keyname', 'N')))
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135
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136 :type layer2: :class:`boto.dynamodb.layer2.Layer2`
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137 :param layer2: A ``Layer2`` api object.
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138
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139 :type name: str
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140 :param name: The name of the table.
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141
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142 :type schema: :class:`boto.dynamodb.schema.Schema`
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143 :param schema: The schema associated with the table.
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144
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145 :rtype: :class:`boto.dynamodb.table.Table`
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146 :return: A Table object representing the table.
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147
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148 """
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149 table = cls(layer2, {'Table': {'TableName': name}})
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150 table._schema = schema
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151 return table
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152
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153 def __repr__(self):
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154 return 'Table(%s)' % self.name
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155
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156 @property
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157 def name(self):
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158 return self._dict['TableName']
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159
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160 @property
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161 def create_time(self):
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162 return self._dict.get('CreationDateTime', None)
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163
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164 @property
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165 def status(self):
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166 return self._dict.get('TableStatus', None)
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167
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168 @property
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169 def item_count(self):
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170 return self._dict.get('ItemCount', 0)
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171
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172 @property
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173 def size_bytes(self):
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174 return self._dict.get('TableSizeBytes', 0)
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175
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176 @property
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177 def schema(self):
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178 return self._schema
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179
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180 @property
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181 def read_units(self):
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182 try:
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183 return self._dict['ProvisionedThroughput']['ReadCapacityUnits']
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184 except KeyError:
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185 return None
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186
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187 @property
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188 def write_units(self):
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189 try:
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190 return self._dict['ProvisionedThroughput']['WriteCapacityUnits']
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191 except KeyError:
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192 return None
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193
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194 def update_from_response(self, response):
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195 """
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196 Update the state of the Table object based on the response
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197 data received from Amazon DynamoDB.
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198 """
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199 # 'Table' is from a describe_table call.
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200 if 'Table' in response:
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201 self._dict.update(response['Table'])
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202 # 'TableDescription' is from a create_table call.
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203 elif 'TableDescription' in response:
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204 self._dict.update(response['TableDescription'])
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205 if 'KeySchema' in self._dict:
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206 self._schema = Schema(self._dict['KeySchema'])
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207
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208 def refresh(self, wait_for_active=False, retry_seconds=5):
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209 """
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210 Refresh all of the fields of the Table object by calling
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211 the underlying DescribeTable request.
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212
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213 :type wait_for_active: bool
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214 :param wait_for_active: If True, this command will not return
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215 until the table status, as returned from Amazon DynamoDB, is
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216 'ACTIVE'.
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217
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218 :type retry_seconds: int
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219 :param retry_seconds: If wait_for_active is True, this
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220 parameter controls the number of seconds of delay between
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221 calls to update_table in Amazon DynamoDB. Default is 5 seconds.
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222 """
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223 done = False
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224 while not done:
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225 response = self.layer2.describe_table(self.name)
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226 self.update_from_response(response)
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227 if wait_for_active:
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228 if self.status == 'ACTIVE':
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229 done = True
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230 else:
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231 time.sleep(retry_seconds)
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232 else:
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233 done = True
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234
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235 def update_throughput(self, read_units, write_units):
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236 """
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237 Update the ProvisionedThroughput for the Amazon DynamoDB Table.
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238
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239 :type read_units: int
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240 :param read_units: The new value for ReadCapacityUnits.
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241
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242 :type write_units: int
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243 :param write_units: The new value for WriteCapacityUnits.
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244 """
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245 self.layer2.update_throughput(self, read_units, write_units)
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246
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247 def delete(self):
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248 """
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249 Delete this table and all items in it. After calling this
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250 the Table objects status attribute will be set to 'DELETING'.
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251 """
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252 self.layer2.delete_table(self)
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253
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254 def get_item(self, hash_key, range_key=None,
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255 attributes_to_get=None, consistent_read=False,
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256 item_class=Item):
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257 """
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258 Retrieve an existing item from the table.
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259
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260 :type hash_key: int|long|float|str|unicode|Binary
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261 :param hash_key: The HashKey of the requested item. The
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262 type of the value must match the type defined in the
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263 schema for the table.
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264
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265 :type range_key: int|long|float|str|unicode|Binary
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266 :param range_key: The optional RangeKey of the requested item.
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267 The type of the value must match the type defined in the
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268 schema for the table.
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269
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270 :type attributes_to_get: list
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271 :param attributes_to_get: A list of attribute names.
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272 If supplied, only the specified attribute names will
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273 be returned. Otherwise, all attributes will be returned.
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274
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275 :type consistent_read: bool
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276 :param consistent_read: If True, a consistent read
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277 request is issued. Otherwise, an eventually consistent
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278 request is issued.
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279
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280 :type item_class: Class
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281 :param item_class: Allows you to override the class used
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282 to generate the items. This should be a subclass of
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283 :class:`boto.dynamodb.item.Item`
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284 """
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285 return self.layer2.get_item(self, hash_key, range_key,
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286 attributes_to_get, consistent_read,
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287 item_class)
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288 lookup = get_item
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289
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290 def has_item(self, hash_key, range_key=None, consistent_read=False):
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291 """
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292 Checks the table to see if the Item with the specified ``hash_key``
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293 exists. This may save a tiny bit of time/bandwidth over a
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294 straight :py:meth:`get_item` if you have no intention to touch
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295 the data that is returned, since this method specifically tells
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296 Amazon not to return anything but the Item's key.
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297
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298 :type hash_key: int|long|float|str|unicode|Binary
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299 :param hash_key: The HashKey of the requested item. The
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300 type of the value must match the type defined in the
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301 schema for the table.
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302
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303 :type range_key: int|long|float|str|unicode|Binary
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304 :param range_key: The optional RangeKey of the requested item.
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305 The type of the value must match the type defined in the
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306 schema for the table.
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307
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308 :type consistent_read: bool
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309 :param consistent_read: If True, a consistent read
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310 request is issued. Otherwise, an eventually consistent
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311 request is issued.
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312
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313 :rtype: bool
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314 :returns: ``True`` if the Item exists, ``False`` if not.
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315 """
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316 try:
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317 # Attempt to get the key. If it can't be found, it'll raise
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318 # an exception.
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319 self.get_item(hash_key, range_key=range_key,
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320 # This minimizes the size of the response body.
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321 attributes_to_get=[hash_key],
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322 consistent_read=consistent_read)
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323 except dynamodb_exceptions.DynamoDBKeyNotFoundError:
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324 # Key doesn't exist.
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325 return False
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326 return True
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327
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328 def new_item(self, hash_key=None, range_key=None, attrs=None,
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329 item_class=Item):
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330 """
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331 Return an new, unsaved Item which can later be PUT to
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332 Amazon DynamoDB.
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333
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334 This method has explicit (but optional) parameters for
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335 the hash_key and range_key values of the item. You can use
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336 these explicit parameters when calling the method, such as::
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337
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338 >>> my_item = my_table.new_item(hash_key='a', range_key=1,
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339 attrs={'key1': 'val1', 'key2': 'val2'})
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340 >>> my_item
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341 {u'bar': 1, u'foo': 'a', 'key1': 'val1', 'key2': 'val2'}
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342
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343 Or, if you prefer, you can simply put the hash_key and range_key
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344 in the attrs dictionary itself, like this::
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345
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346 >>> attrs = {'foo': 'a', 'bar': 1, 'key1': 'val1', 'key2': 'val2'}
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347 >>> my_item = my_table.new_item(attrs=attrs)
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348 >>> my_item
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349 {u'bar': 1, u'foo': 'a', 'key1': 'val1', 'key2': 'val2'}
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350
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351 The effect is the same.
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352
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353 .. note:
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354 The explicit parameters take priority over the values in
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355 the attrs dict. So, if you have a hash_key or range_key
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356 in the attrs dict and you also supply either or both using
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357 the explicit parameters, the values in the attrs will be
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358 ignored.
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359
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360 :type hash_key: int|long|float|str|unicode|Binary
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361 :param hash_key: The HashKey of the new item. The
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362 type of the value must match the type defined in the
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363 schema for the table.
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364
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365 :type range_key: int|long|float|str|unicode|Binary
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366 :param range_key: The optional RangeKey of the new item.
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367 The type of the value must match the type defined in the
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368 schema for the table.
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369
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370 :type attrs: dict
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371 :param attrs: A dictionary of key value pairs used to
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372 populate the new item.
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373
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374 :type item_class: Class
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375 :param item_class: Allows you to override the class used
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376 to generate the items. This should be a subclass of
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377 :class:`boto.dynamodb.item.Item`
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378 """
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379 return item_class(self, hash_key, range_key, attrs)
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380
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381 def query(self, hash_key, *args, **kw):
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382 """
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383 Perform a query on the table.
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384
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385 :type hash_key: int|long|float|str|unicode|Binary
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386 :param hash_key: The HashKey of the requested item. The
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387 type of the value must match the type defined in the
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388 schema for the table.
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389
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390 :type range_key_condition: :class:`boto.dynamodb.condition.Condition`
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391 :param range_key_condition: A Condition object.
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392 Condition object can be one of the following types:
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393
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394 EQ|LE|LT|GE|GT|BEGINS_WITH|BETWEEN
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395
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396 The only condition which expects or will accept two
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397 values is 'BETWEEN', otherwise a single value should
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398 be passed to the Condition constructor.
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399
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400 :type attributes_to_get: list
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401 :param attributes_to_get: A list of attribute names.
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402 If supplied, only the specified attribute names will
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403 be returned. Otherwise, all attributes will be returned.
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404
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405 :type request_limit: int
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406 :param request_limit: The maximum number of items to retrieve
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407 from Amazon DynamoDB on each request. You may want to set
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408 a specific request_limit based on the provisioned throughput
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409 of your table. The default behavior is to retrieve as many
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410 results as possible per request.
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411
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412 :type max_results: int
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413 :param max_results: The maximum number of results that will
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414 be retrieved from Amazon DynamoDB in total. For example,
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415 if you only wanted to see the first 100 results from the
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416 query, regardless of how many were actually available, you
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417 could set max_results to 100 and the generator returned
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418 from the query method will only yeild 100 results max.
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419
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420 :type consistent_read: bool
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421 :param consistent_read: If True, a consistent read
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422 request is issued. Otherwise, an eventually consistent
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423 request is issued.
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424
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425 :type scan_index_forward: bool
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426 :param scan_index_forward: Specified forward or backward
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427 traversal of the index. Default is forward (True).
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428
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429 :type exclusive_start_key: list or tuple
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430 :param exclusive_start_key: Primary key of the item from
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431 which to continue an earlier query. This would be
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432 provided as the LastEvaluatedKey in that query.
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433
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434 :type count: bool
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435 :param count: If True, Amazon DynamoDB returns a total
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436 number of items for the Query operation, even if the
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437 operation has no matching items for the assigned filter.
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438 If count is True, the actual items are not returned and
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439 the count is accessible as the ``count`` attribute of
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440 the returned object.
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441
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442
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443 :type item_class: Class
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444 :param item_class: Allows you to override the class used
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445 to generate the items. This should be a subclass of
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446 :class:`boto.dynamodb.item.Item`
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447 """
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448 return self.layer2.query(self, hash_key, *args, **kw)
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449
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450 def scan(self, *args, **kw):
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451 """
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452 Scan through this table, this is a very long
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453 and expensive operation, and should be avoided if
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454 at all possible.
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455
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456 :type scan_filter: A dict
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457 :param scan_filter: A dictionary where the key is the
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458 attribute name and the value is a
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459 :class:`boto.dynamodb.condition.Condition` object.
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460 Valid Condition objects include:
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461
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462 * EQ - equal (1)
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463 * NE - not equal (1)
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464 * LE - less than or equal (1)
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465 * LT - less than (1)
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466 * GE - greater than or equal (1)
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467 * GT - greater than (1)
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468 * NOT_NULL - attribute exists (0, use None)
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469 * NULL - attribute does not exist (0, use None)
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470 * CONTAINS - substring or value in list (1)
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471 * NOT_CONTAINS - absence of substring or value in list (1)
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472 * BEGINS_WITH - substring prefix (1)
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473 * IN - exact match in list (N)
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474 * BETWEEN - >= first value, <= second value (2)
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475
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476 :type attributes_to_get: list
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477 :param attributes_to_get: A list of attribute names.
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478 If supplied, only the specified attribute names will
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479 be returned. Otherwise, all attributes will be returned.
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480
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481 :type request_limit: int
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482 :param request_limit: The maximum number of items to retrieve
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483 from Amazon DynamoDB on each request. You may want to set
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484 a specific request_limit based on the provisioned throughput
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485 of your table. The default behavior is to retrieve as many
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486 results as possible per request.
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487
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488 :type max_results: int
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489 :param max_results: The maximum number of results that will
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490 be retrieved from Amazon DynamoDB in total. For example,
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491 if you only wanted to see the first 100 results from the
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492 query, regardless of how many were actually available, you
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493 could set max_results to 100 and the generator returned
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494 from the query method will only yeild 100 results max.
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495
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496 :type count: bool
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497 :param count: If True, Amazon DynamoDB returns a total
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498 number of items for the Scan operation, even if the
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499 operation has no matching items for the assigned filter.
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500 If count is True, the actual items are not returned and
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501 the count is accessible as the ``count`` attribute of
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502 the returned object.
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503
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504 :type exclusive_start_key: list or tuple
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505 :param exclusive_start_key: Primary key of the item from
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506 which to continue an earlier query. This would be
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507 provided as the LastEvaluatedKey in that query.
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508
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509 :type item_class: Class
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510 :param item_class: Allows you to override the class used
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511 to generate the items. This should be a subclass of
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512 :class:`boto.dynamodb.item.Item`
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513
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514 :return: A TableGenerator (generator) object which will iterate
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515 over all results
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516 :rtype: :class:`boto.dynamodb.layer2.TableGenerator`
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517 """
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518 return self.layer2.scan(self, *args, **kw)
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519
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520 def batch_get_item(self, keys, attributes_to_get=None):
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521 """
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522 Return a set of attributes for a multiple items from a single table
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523 using their primary keys. This abstraction removes the 100 Items per
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524 batch limitations as well as the "UnprocessedKeys" logic.
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525
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526 :type keys: list
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527 :param keys: A list of scalar or tuple values. Each element in the
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528 list represents one Item to retrieve. If the schema for the
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529 table has both a HashKey and a RangeKey, each element in the
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530 list should be a tuple consisting of (hash_key, range_key). If
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531 the schema for the table contains only a HashKey, each element
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532 in the list should be a scalar value of the appropriate type
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533 for the table schema. NOTE: The maximum number of items that
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534 can be retrieved for a single operation is 100. Also, the
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535 number of items retrieved is constrained by a 1 MB size limit.
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536
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537 :type attributes_to_get: list
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538 :param attributes_to_get: A list of attribute names.
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539 If supplied, only the specified attribute names will
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540 be returned. Otherwise, all attributes will be returned.
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541
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542 :return: A TableBatchGenerator (generator) object which will
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543 iterate over all results
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544 :rtype: :class:`boto.dynamodb.table.TableBatchGenerator`
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545 """
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546 return TableBatchGenerator(self, keys, attributes_to_get)