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annotate planemo/lib/python3.7/site-packages/boto/dynamodb/batch.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 from boto.compat import six
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24
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25
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26 class Batch(object):
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27 """
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28 Used to construct a BatchGet request.
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29
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30 :ivar table: The Table object from which the item is retrieved.
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31
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32 :ivar keys: A list of scalar or tuple values. Each element in the
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33 list represents one Item to retrieve. If the schema for the
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34 table has both a HashKey and a RangeKey, each element in the
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35 list should be a tuple consisting of (hash_key, range_key). If
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36 the schema for the table contains only a HashKey, each element
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37 in the list should be a scalar value of the appropriate type
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38 for the table schema. NOTE: The maximum number of items that
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39 can be retrieved for a single operation is 100. Also, the
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40 number of items retrieved is constrained by a 1 MB size limit.
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41
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42 :ivar attributes_to_get: A list of attribute names.
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43 If supplied, only the specified attribute names will
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44 be returned. Otherwise, all attributes will be returned.
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45
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46 :ivar consistent_read: Specify whether or not to use a
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47 consistent read. Defaults to False.
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48
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49 """
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50
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51 def __init__(self, table, keys, attributes_to_get=None,
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52 consistent_read=False):
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53 self.table = table
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54 self.keys = keys
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55 self.attributes_to_get = attributes_to_get
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56 self.consistent_read = consistent_read
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57
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58 def to_dict(self):
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59 """
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60 Convert the Batch object into the format required for Layer1.
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61 """
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62 batch_dict = {}
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63 key_list = []
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64 for key in self.keys:
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65 if isinstance(key, tuple):
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66 hash_key, range_key = key
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67 else:
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68 hash_key = key
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69 range_key = None
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70 k = self.table.layer2.build_key_from_values(self.table.schema,
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71 hash_key, range_key)
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72 key_list.append(k)
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73 batch_dict['Keys'] = key_list
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74 if self.attributes_to_get:
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75 batch_dict['AttributesToGet'] = self.attributes_to_get
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76 if self.consistent_read:
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77 batch_dict['ConsistentRead'] = True
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78 else:
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79 batch_dict['ConsistentRead'] = False
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80 return batch_dict
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81
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82
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83 class BatchWrite(object):
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84 """
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85 Used to construct a BatchWrite request. Each BatchWrite object
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86 represents a collection of PutItem and DeleteItem requests for
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87 a single Table.
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88
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89 :ivar table: The Table object from which the item is retrieved.
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90
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91 :ivar puts: A list of :class:`boto.dynamodb.item.Item` objects
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92 that you want to write to DynamoDB.
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93
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94 :ivar deletes: A list of scalar or tuple values. Each element in the
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95 list represents one Item to delete. If the schema for the
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96 table has both a HashKey and a RangeKey, each element in the
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97 list should be a tuple consisting of (hash_key, range_key). If
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98 the schema for the table contains only a HashKey, each element
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99 in the list should be a scalar value of the appropriate type
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100 for the table schema.
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101 """
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102
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103 def __init__(self, table, puts=None, deletes=None):
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104 self.table = table
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105 self.puts = puts or []
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106 self.deletes = deletes or []
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107
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108 def to_dict(self):
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109 """
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110 Convert the Batch object into the format required for Layer1.
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111 """
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112 op_list = []
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113 for item in self.puts:
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114 d = {'Item': self.table.layer2.dynamize_item(item)}
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115 d = {'PutRequest': d}
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116 op_list.append(d)
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117 for key in self.deletes:
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118 if isinstance(key, tuple):
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119 hash_key, range_key = key
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120 else:
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121 hash_key = key
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122 range_key = None
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123 k = self.table.layer2.build_key_from_values(self.table.schema,
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124 hash_key, range_key)
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125 d = {'Key': k}
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126 op_list.append({'DeleteRequest': d})
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127 return (self.table.name, op_list)
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128
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129
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130 class BatchList(list):
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131 """
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132 A subclass of a list object that contains a collection of
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133 :class:`boto.dynamodb.batch.Batch` objects.
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134 """
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135
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136 def __init__(self, layer2):
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137 list.__init__(self)
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138 self.unprocessed = None
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139 self.layer2 = layer2
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140
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141 def add_batch(self, table, keys, attributes_to_get=None,
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142 consistent_read=False):
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143 """
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144 Add a Batch to this BatchList.
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145
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146 :type table: :class:`boto.dynamodb.table.Table`
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147 :param table: The Table object in which the items are contained.
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148
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149 :type keys: list
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150 :param keys: A list of scalar or tuple values. Each element in the
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151 list represents one Item to retrieve. If the schema for the
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152 table has both a HashKey and a RangeKey, each element in the
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153 list should be a tuple consisting of (hash_key, range_key). If
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154 the schema for the table contains only a HashKey, each element
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155 in the list should be a scalar value of the appropriate type
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156 for the table schema. NOTE: The maximum number of items that
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157 can be retrieved for a single operation is 100. Also, the
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158 number of items retrieved is constrained by a 1 MB size limit.
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159
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160 :type attributes_to_get: list
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161 :param attributes_to_get: A list of attribute names.
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162 If supplied, only the specified attribute names will
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163 be returned. Otherwise, all attributes will be returned.
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164 """
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165 self.append(Batch(table, keys, attributes_to_get, consistent_read))
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166
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167 def resubmit(self):
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168 """
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169 Resubmit the batch to get the next result set. The request object is
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170 rebuild from scratch meaning that all batch added between ``submit``
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171 and ``resubmit`` will be lost.
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172
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173 Note: This method is experimental and subject to changes in future releases
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174 """
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175 del self[:]
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176
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177 if not self.unprocessed:
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178 return None
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179
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180 for table_name, table_req in six.iteritems(self.unprocessed):
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181 table_keys = table_req['Keys']
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182 table = self.layer2.get_table(table_name)
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183
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184 keys = []
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185 for key in table_keys:
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186 h = key['HashKeyElement']
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187 r = None
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188 if 'RangeKeyElement' in key:
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189 r = key['RangeKeyElement']
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190 keys.append((h, r))
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191
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192 attributes_to_get = None
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193 if 'AttributesToGet' in table_req:
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194 attributes_to_get = table_req['AttributesToGet']
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195
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196 self.add_batch(table, keys, attributes_to_get=attributes_to_get)
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197
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198 return self.submit()
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199
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200 def submit(self):
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201 res = self.layer2.batch_get_item(self)
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202 if 'UnprocessedKeys' in res:
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203 self.unprocessed = res['UnprocessedKeys']
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204 return res
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205
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206 def to_dict(self):
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207 """
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208 Convert a BatchList object into format required for Layer1.
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209 """
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210 d = {}
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211 for batch in self:
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212 b = batch.to_dict()
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213 if b['Keys']:
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214 d[batch.table.name] = b
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215 return d
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216
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217
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218 class BatchWriteList(list):
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219 """
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220 A subclass of a list object that contains a collection of
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221 :class:`boto.dynamodb.batch.BatchWrite` objects.
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222 """
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223
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224 def __init__(self, layer2):
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225 list.__init__(self)
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226 self.layer2 = layer2
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227
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228 def add_batch(self, table, puts=None, deletes=None):
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229 """
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230 Add a BatchWrite to this BatchWriteList.
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231
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232 :type table: :class:`boto.dynamodb.table.Table`
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233 :param table: The Table object in which the items are contained.
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234
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235 :type puts: list of :class:`boto.dynamodb.item.Item` objects
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236 :param puts: A list of items that you want to write to DynamoDB.
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237
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238 :type deletes: A list
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239 :param deletes: A list of scalar or tuple values. Each element
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240 in the list represents one Item to delete. If the schema
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241 for the table has both a HashKey and a RangeKey, each
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242 element in the list should be a tuple consisting of
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243 (hash_key, range_key). If the schema for the table
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244 contains only a HashKey, each element in the list should
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245 be a scalar value of the appropriate type for the table
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246 schema.
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247 """
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248 self.append(BatchWrite(table, puts, deletes))
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249
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250 def submit(self):
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251 return self.layer2.batch_write_item(self)
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252
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253 def to_dict(self):
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254 """
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255 Convert a BatchWriteList object into format required for Layer1.
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256 """
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257 d = {}
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258 for batch in self:
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259 table_name, batch_dict = batch.to_dict()
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260 d[table_name] = batch_dict
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261 return d