Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/boto/dynamodb/layer2.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
parents d30785e31577
children
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1 # Copyright (c) 2011 Mitch Garnaat http://garnaat.org/
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2 # Copyright (c) 2011 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.dynamodb.layer1 import Layer1
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24 from boto.dynamodb.table import Table
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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.batch import BatchList, BatchWriteList
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28 from boto.dynamodb.types import get_dynamodb_type, Dynamizer, \
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29 LossyFloatDynamizer, NonBooleanDynamizer
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30
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31
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32 class TableGenerator(object):
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33 """
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34 This is an object that wraps up the table_generator function.
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35 The only real reason to have this is that we want to be able
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36 to accumulate and return the ConsumedCapacityUnits element that
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37 is part of each response.
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38
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39 :ivar last_evaluated_key: A sequence representing the key(s)
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40 of the item last evaluated, or None if no additional
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41 results are available.
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42
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43 :ivar remaining: The remaining quantity of results requested.
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44
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45 :ivar table: The table to which the call was made.
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46 """
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47
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48 def __init__(self, table, callable, remaining, item_class, kwargs):
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49 self.table = table
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50 self.callable = callable
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51 self.remaining = -1 if remaining is None else remaining
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52 self.item_class = item_class
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53 self.kwargs = kwargs
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54 self._consumed_units = 0.0
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55 self.last_evaluated_key = None
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56 self._count = 0
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57 self._scanned_count = 0
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58 self._response = None
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59
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60 @property
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61 def count(self):
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62 """
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63 The total number of items retrieved thus far. This value changes with
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64 iteration and even when issuing a call with count=True, it is necessary
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65 to complete the iteration to assert an accurate count value.
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66 """
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67 self.response
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68 return self._count
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69
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70 @property
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71 def scanned_count(self):
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72 """
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73 As above, but representing the total number of items scanned by
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74 DynamoDB, without regard to any filters.
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75 """
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76 self.response
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77 return self._scanned_count
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78
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79 @property
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80 def consumed_units(self):
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81 """
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82 Returns a float representing the ConsumedCapacityUnits accumulated.
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83 """
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84 self.response
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85 return self._consumed_units
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86
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87 @property
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88 def response(self):
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89 """
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90 The current response to the call from DynamoDB.
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91 """
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92 return self.next_response() if self._response is None else self._response
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93
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94 def next_response(self):
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95 """
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96 Issue a call and return the result. You can invoke this method
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97 while iterating over the TableGenerator in order to skip to the
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98 next "page" of results.
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99 """
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100 # preserve any existing limit in case the user alters self.remaining
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101 limit = self.kwargs.get('limit')
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102 if (self.remaining > 0 and (limit is None or limit > self.remaining)):
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103 self.kwargs['limit'] = self.remaining
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104 self._response = self.callable(**self.kwargs)
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105 self.kwargs['limit'] = limit
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106 self._consumed_units += self._response.get('ConsumedCapacityUnits', 0.0)
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107 self._count += self._response.get('Count', 0)
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108 self._scanned_count += self._response.get('ScannedCount', 0)
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109 # at the expense of a possibly gratuitous dynamize, ensure that
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110 # early generator termination won't result in bad LEK values
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111 if 'LastEvaluatedKey' in self._response:
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112 lek = self._response['LastEvaluatedKey']
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113 esk = self.table.layer2.dynamize_last_evaluated_key(lek)
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114 self.kwargs['exclusive_start_key'] = esk
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115 lektuple = (lek['HashKeyElement'],)
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116 if 'RangeKeyElement' in lek:
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117 lektuple += (lek['RangeKeyElement'],)
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118 self.last_evaluated_key = lektuple
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119 else:
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120 self.last_evaluated_key = None
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121 return self._response
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122
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123 def __iter__(self):
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124 while self.remaining != 0:
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125 response = self.response
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126 for item in response.get('Items', []):
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127 self.remaining -= 1
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128 yield self.item_class(self.table, attrs=item)
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129 if self.remaining == 0:
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130 break
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131 if response is not self._response:
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132 break
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133 else:
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134 if self.last_evaluated_key is not None:
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135 self.next_response()
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136 continue
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137 break
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138 if response is not self._response:
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139 continue
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140 break
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141
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142
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143 class Layer2(object):
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144
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145 def __init__(self, aws_access_key_id=None, aws_secret_access_key=None,
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146 is_secure=True, port=None, proxy=None, proxy_port=None,
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147 debug=0, security_token=None, region=None,
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148 validate_certs=True, dynamizer=LossyFloatDynamizer,
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149 profile_name=None):
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150 self.layer1 = Layer1(aws_access_key_id, aws_secret_access_key,
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151 is_secure, port, proxy, proxy_port,
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152 debug, security_token, region,
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153 validate_certs=validate_certs,
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154 profile_name=profile_name)
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155 self.dynamizer = dynamizer()
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156
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157 def use_decimals(self, use_boolean=False):
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158 """
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159 Use the ``decimal.Decimal`` type for encoding/decoding numeric types.
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160
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161 By default, ints/floats are used to represent numeric types
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162 ('N', 'NS') received from DynamoDB. Using the ``Decimal``
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163 type is recommended to prevent loss of precision.
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164
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165 """
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166 # Eventually this should be made the default dynamizer.
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167 self.dynamizer = Dynamizer() if use_boolean else NonBooleanDynamizer()
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168
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169 def dynamize_attribute_updates(self, pending_updates):
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170 """
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171 Convert a set of pending item updates into the structure
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172 required by Layer1.
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173 """
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174 d = {}
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175 for attr_name in pending_updates:
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176 action, value = pending_updates[attr_name]
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177 if value is None:
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178 # DELETE without an attribute value
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179 d[attr_name] = {"Action": action}
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180 else:
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181 d[attr_name] = {"Action": action,
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182 "Value": self.dynamizer.encode(value)}
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183 return d
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184
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185 def dynamize_item(self, item):
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186 d = {}
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187 for attr_name in item:
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188 d[attr_name] = self.dynamizer.encode(item[attr_name])
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189 return d
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190
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191 def dynamize_range_key_condition(self, range_key_condition):
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192 """
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193 Convert a layer2 range_key_condition parameter into the
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194 structure required by Layer1.
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195 """
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196 return range_key_condition.to_dict()
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197
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198 def dynamize_scan_filter(self, scan_filter):
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199 """
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200 Convert a layer2 scan_filter parameter into the
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201 structure required by Layer1.
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202 """
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203 d = None
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204 if scan_filter:
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205 d = {}
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206 for attr_name in scan_filter:
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207 condition = scan_filter[attr_name]
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208 d[attr_name] = condition.to_dict()
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209 return d
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210
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211 def dynamize_expected_value(self, expected_value):
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212 """
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213 Convert an expected_value parameter into the data structure
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214 required for Layer1.
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215 """
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216 d = None
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217 if expected_value:
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218 d = {}
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219 for attr_name in expected_value:
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220 attr_value = expected_value[attr_name]
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221 if attr_value is True:
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222 attr_value = {'Exists': True}
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223 elif attr_value is False:
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224 attr_value = {'Exists': False}
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225 else:
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226 val = self.dynamizer.encode(expected_value[attr_name])
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227 attr_value = {'Value': val}
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228 d[attr_name] = attr_value
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229 return d
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230
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231 def dynamize_last_evaluated_key(self, last_evaluated_key):
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232 """
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233 Convert a last_evaluated_key parameter into the data structure
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234 required for Layer1.
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235 """
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236 d = None
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237 if last_evaluated_key:
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238 hash_key = last_evaluated_key['HashKeyElement']
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239 d = {'HashKeyElement': self.dynamizer.encode(hash_key)}
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240 if 'RangeKeyElement' in last_evaluated_key:
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241 range_key = last_evaluated_key['RangeKeyElement']
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242 d['RangeKeyElement'] = self.dynamizer.encode(range_key)
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243 return d
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244
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245 def build_key_from_values(self, schema, hash_key, range_key=None):
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246 """
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247 Build a Key structure to be used for accessing items
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248 in Amazon DynamoDB. This method takes the supplied hash_key
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249 and optional range_key and validates them against the
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250 schema. If there is a mismatch, a TypeError is raised.
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251 Otherwise, a Python dict version of a Amazon DynamoDB Key
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252 data structure is returned.
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253
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254 :type hash_key: int|float|str|unicode|Binary
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255 :param hash_key: The hash key of the item you are looking for.
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256 The type of the hash key should match the type defined in
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257 the schema.
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258
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259 :type range_key: int|float|str|unicode|Binary
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260 :param range_key: The range key of the item your are looking for.
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261 This should be supplied only if the schema requires a
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262 range key. The type of the range key should match the
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263 type defined in the schema.
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264 """
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265 dynamodb_key = {}
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266 dynamodb_value = self.dynamizer.encode(hash_key)
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267 if list(dynamodb_value.keys())[0] != schema.hash_key_type:
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268 msg = 'Hashkey must be of type: %s' % schema.hash_key_type
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269 raise TypeError(msg)
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270 dynamodb_key['HashKeyElement'] = dynamodb_value
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271 if range_key is not None:
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272 dynamodb_value = self.dynamizer.encode(range_key)
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273 if list(dynamodb_value.keys())[0] != schema.range_key_type:
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274 msg = 'RangeKey must be of type: %s' % schema.range_key_type
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275 raise TypeError(msg)
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276 dynamodb_key['RangeKeyElement'] = dynamodb_value
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277 return dynamodb_key
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278
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279 def new_batch_list(self):
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280 """
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281 Return a new, empty :class:`boto.dynamodb.batch.BatchList`
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282 object.
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283 """
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284 return BatchList(self)
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285
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286 def new_batch_write_list(self):
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287 """
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288 Return a new, empty :class:`boto.dynamodb.batch.BatchWriteList`
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289 object.
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290 """
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291 return BatchWriteList(self)
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292
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293 def list_tables(self, limit=None):
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294 """
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295 Return a list of the names of all tables associated with the
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296 current account and region.
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297
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298 :type limit: int
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299 :param limit: The maximum number of tables to return.
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300 """
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301 tables = []
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302 start_table = None
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303 while not limit or len(tables) < limit:
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304 this_round_limit = None
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305 if limit:
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306 this_round_limit = limit - len(tables)
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307 this_round_limit = min(this_round_limit, 100)
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308 result = self.layer1.list_tables(limit=this_round_limit, start_table=start_table)
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309 tables.extend(result.get('TableNames', []))
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310 start_table = result.get('LastEvaluatedTableName', None)
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311 if not start_table:
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312 break
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313 return tables
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314
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315 def describe_table(self, name):
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316 """
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317 Retrieve information about an existing table.
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318
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319 :type name: str
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320 :param name: The name of the desired table.
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321
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322 """
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323 return self.layer1.describe_table(name)
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324
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325 def table_from_schema(self, name, schema):
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326 """
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327 Create a Table object from a schema.
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328
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329 This method will create a Table object without
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330 making any API calls. If you know the name and schema
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331 of the table, you can use this method instead of
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332 ``get_table``.
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333
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334 Example usage::
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335
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336 table = layer2.table_from_schema(
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337 'tablename',
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338 Schema.create(hash_key=('foo', 'N')))
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339
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340 :type name: str
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341 :param name: The name of the table.
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342
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343 :type schema: :class:`boto.dynamodb.schema.Schema`
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344 :param schema: The schema associated with the table.
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345
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346 :rtype: :class:`boto.dynamodb.table.Table`
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347 :return: A Table object representing the table.
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348
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349 """
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350 return Table.create_from_schema(self, name, schema)
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351
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352 def get_table(self, name):
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353 """
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354 Retrieve the Table object for an existing table.
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355
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356 :type name: str
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357 :param name: The name of the desired table.
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358
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359 :rtype: :class:`boto.dynamodb.table.Table`
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360 :return: A Table object representing the table.
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361 """
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362 response = self.layer1.describe_table(name)
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363 return Table(self, response)
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364
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365 lookup = get_table
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366
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367 def create_table(self, name, schema, read_units, write_units):
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368 """
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369 Create a new Amazon DynamoDB table.
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370
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371 :type name: str
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372 :param name: The name of the desired table.
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373
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374 :type schema: :class:`boto.dynamodb.schema.Schema`
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375 :param schema: The Schema object that defines the schema used
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376 by this table.
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377
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378 :type read_units: int
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379 :param read_units: The value for ReadCapacityUnits.
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380
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381 :type write_units: int
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382 :param write_units: The value for WriteCapacityUnits.
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383
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384 :rtype: :class:`boto.dynamodb.table.Table`
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385 :return: A Table object representing the new Amazon DynamoDB table.
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386 """
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387 response = self.layer1.create_table(name, schema.dict,
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388 {'ReadCapacityUnits': read_units,
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389 'WriteCapacityUnits': write_units})
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390 return Table(self, response)
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391
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392 def update_throughput(self, table, read_units, write_units):
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393 """
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394 Update the ProvisionedThroughput for the Amazon DynamoDB Table.
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395
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396 :type table: :class:`boto.dynamodb.table.Table`
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397 :param table: The Table object whose throughput is being updated.
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398
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399 :type read_units: int
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400 :param read_units: The new value for ReadCapacityUnits.
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401
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402 :type write_units: int
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403 :param write_units: The new value for WriteCapacityUnits.
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404 """
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405 response = self.layer1.update_table(table.name,
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406 {'ReadCapacityUnits': read_units,
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407 'WriteCapacityUnits': write_units})
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408 table.update_from_response(response)
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409
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410 def delete_table(self, table):
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411 """
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412 Delete this table and all items in it. After calling this
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413 the Table objects status attribute will be set to 'DELETING'.
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414
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415 :type table: :class:`boto.dynamodb.table.Table`
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416 :param table: The Table object that is being deleted.
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417 """
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418 response = self.layer1.delete_table(table.name)
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419 table.update_from_response(response)
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420
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421 def create_schema(self, hash_key_name, hash_key_proto_value,
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422 range_key_name=None, range_key_proto_value=None):
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423 """
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424 Create a Schema object used when creating a Table.
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425
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426 :type hash_key_name: str
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427 :param hash_key_name: The name of the HashKey for the schema.
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428
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429 :type hash_key_proto_value: int|long|float|str|unicode|Binary
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430 :param hash_key_proto_value: A sample or prototype of the type
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431 of value you want to use for the HashKey. Alternatively,
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432 you can also just pass in the Python type (e.g. int, float, etc.).
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433
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434 :type range_key_name: str
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435 :param range_key_name: The name of the RangeKey for the schema.
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436 This parameter is optional.
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437
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438 :type range_key_proto_value: int|long|float|str|unicode|Binary
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439 :param range_key_proto_value: A sample or prototype of the type
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440 of value you want to use for the RangeKey. Alternatively,
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441 you can also pass in the Python type (e.g. int, float, etc.)
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442 This parameter is optional.
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443 """
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444 hash_key = (hash_key_name, get_dynamodb_type(hash_key_proto_value))
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445 if range_key_name and range_key_proto_value is not None:
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446 range_key = (range_key_name,
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447 get_dynamodb_type(range_key_proto_value))
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448 else:
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449 range_key = None
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450 return Schema.create(hash_key, range_key)
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451
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452 def get_item(self, table, hash_key, range_key=None,
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453 attributes_to_get=None, consistent_read=False,
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454 item_class=Item):
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455 """
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456 Retrieve an existing item from the table.
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457
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458 :type table: :class:`boto.dynamodb.table.Table`
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459 :param table: The Table object from which the item is retrieved.
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460
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461 :type hash_key: int|long|float|str|unicode|Binary
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462 :param hash_key: The HashKey of the requested item. The
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463 type of the value must match the type defined in the
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464 schema for the table.
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465
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466 :type range_key: int|long|float|str|unicode|Binary
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467 :param range_key: The optional RangeKey of the requested item.
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468 The type of the value must match the type defined in the
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469 schema for the table.
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470
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471 :type attributes_to_get: list
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472 :param attributes_to_get: A list of attribute names.
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473 If supplied, only the specified attribute names will
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474 be returned. Otherwise, all attributes will be returned.
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475
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476 :type consistent_read: bool
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477 :param consistent_read: If True, a consistent read
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478 request is issued. Otherwise, an eventually consistent
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479 request is issued.
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480
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481 :type item_class: Class
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482 :param item_class: Allows you to override the class used
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483 to generate the items. This should be a subclass of
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484 :class:`boto.dynamodb.item.Item`
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485 """
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486 key = self.build_key_from_values(table.schema, hash_key, range_key)
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487 response = self.layer1.get_item(table.name, key,
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488 attributes_to_get, consistent_read,
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489 object_hook=self.dynamizer.decode)
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490 item = item_class(table, hash_key, range_key, response['Item'])
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491 if 'ConsumedCapacityUnits' in response:
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492 item.consumed_units = response['ConsumedCapacityUnits']
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493 return item
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494
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495 def batch_get_item(self, batch_list):
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496 """
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497 Return a set of attributes for a multiple items in
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498 multiple tables using their primary keys.
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499
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500 :type batch_list: :class:`boto.dynamodb.batch.BatchList`
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501 :param batch_list: A BatchList object which consists of a
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502 list of :class:`boto.dynamoddb.batch.Batch` objects.
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503 Each Batch object contains the information about one
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504 batch of objects that you wish to retrieve in this
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505 request.
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506 """
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507 request_items = batch_list.to_dict()
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508 return self.layer1.batch_get_item(request_items,
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509 object_hook=self.dynamizer.decode)
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510
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511 def batch_write_item(self, batch_list):
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512 """
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513 Performs multiple Puts and Deletes in one batch.
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514
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515 :type batch_list: :class:`boto.dynamodb.batch.BatchWriteList`
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516 :param batch_list: A BatchWriteList object which consists of a
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517 list of :class:`boto.dynamoddb.batch.BatchWrite` objects.
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518 Each Batch object contains the information about one
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519 batch of objects that you wish to put or delete.
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520 """
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521 request_items = batch_list.to_dict()
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522 return self.layer1.batch_write_item(request_items,
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523 object_hook=self.dynamizer.decode)
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524
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525 def put_item(self, item, expected_value=None, return_values=None):
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526 """
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527 Store a new item or completely replace an existing item
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528 in Amazon DynamoDB.
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diff changeset
529
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530 :type item: :class:`boto.dynamodb.item.Item`
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531 :param item: The Item to write to Amazon DynamoDB.
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532
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533 :type expected_value: dict
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534 :param expected_value: A dictionary of name/value pairs that you expect.
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535 This dictionary should have name/value pairs where the name
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536 is the name of the attribute and the value is either the value
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diff changeset
537 you are expecting or False if you expect the attribute not to
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538 exist.
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539
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540 :type return_values: str
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541 :param return_values: Controls the return of attribute
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542 name-value pairs before then were changed. Possible
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543 values are: None or 'ALL_OLD'. If 'ALL_OLD' is
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544 specified and the item is overwritten, the content
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545 of the old item is returned.
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546 """
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547 expected_value = self.dynamize_expected_value(expected_value)
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548 response = self.layer1.put_item(item.table.name,
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549 self.dynamize_item(item),
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550 expected_value, return_values,
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551 object_hook=self.dynamizer.decode)
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552 if 'ConsumedCapacityUnits' in response:
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553 item.consumed_units = response['ConsumedCapacityUnits']
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554 return response
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555
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556 def update_item(self, item, expected_value=None, return_values=None):
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557 """
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558 Commit pending item updates to Amazon DynamoDB.
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559
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560 :type item: :class:`boto.dynamodb.item.Item`
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561 :param item: The Item to update in Amazon DynamoDB. It is expected
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diff changeset
562 that you would have called the add_attribute, put_attribute
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563 and/or delete_attribute methods on this Item prior to calling
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564 this method. Those queued changes are what will be updated.
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565
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566 :type expected_value: dict
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567 :param expected_value: A dictionary of name/value pairs that you
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568 expect. This dictionary should have name/value pairs where the
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diff changeset
569 name is the name of the attribute and the value is either the
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570 value you are expecting or False if you expect the attribute
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571 not to exist.
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572
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573 :type return_values: str
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574 :param return_values: Controls the return of attribute name/value pairs
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575 before they were updated. Possible values are: None, 'ALL_OLD',
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576 'UPDATED_OLD', 'ALL_NEW' or 'UPDATED_NEW'. If 'ALL_OLD' is
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577 specified and the item is overwritten, the content of the old item
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578 is returned. If 'ALL_NEW' is specified, then all the attributes of
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579 the new version of the item are returned. If 'UPDATED_NEW' is
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580 specified, the new versions of only the updated attributes are
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581 returned.
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582
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583 """
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584 expected_value = self.dynamize_expected_value(expected_value)
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585 key = self.build_key_from_values(item.table.schema,
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586 item.hash_key, item.range_key)
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diff changeset
587 attr_updates = self.dynamize_attribute_updates(item._updates)
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588
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589 response = self.layer1.update_item(item.table.name, key,
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590 attr_updates,
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591 expected_value, return_values,
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592 object_hook=self.dynamizer.decode)
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593 item._updates.clear()
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594 if 'ConsumedCapacityUnits' in response:
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595 item.consumed_units = response['ConsumedCapacityUnits']
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596 return response
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597
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598 def delete_item(self, item, expected_value=None, return_values=None):
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599 """
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600 Delete the item from Amazon DynamoDB.
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601
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602 :type item: :class:`boto.dynamodb.item.Item`
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603 :param item: The Item to delete from Amazon DynamoDB.
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604
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605 :type expected_value: dict
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606 :param expected_value: A dictionary of name/value pairs that you expect.
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diff changeset
607 This dictionary should have name/value pairs where the name
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608 is the name of the attribute and the value is either the value
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diff changeset
609 you are expecting or False if you expect the attribute not to
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610 exist.
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611
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612 :type return_values: str
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613 :param return_values: Controls the return of attribute
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614 name-value pairs before then were changed. Possible
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615 values are: None or 'ALL_OLD'. If 'ALL_OLD' is
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616 specified and the item is overwritten, the content
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617 of the old item is returned.
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618 """
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619 expected_value = self.dynamize_expected_value(expected_value)
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620 key = self.build_key_from_values(item.table.schema,
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621 item.hash_key, item.range_key)
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622 return self.layer1.delete_item(item.table.name, key,
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623 expected=expected_value,
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624 return_values=return_values,
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625 object_hook=self.dynamizer.decode)
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626
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627 def query(self, table, hash_key, range_key_condition=None,
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628 attributes_to_get=None, request_limit=None,
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629 max_results=None, consistent_read=False,
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630 scan_index_forward=True, exclusive_start_key=None,
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631 item_class=Item, count=False):
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632 """
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633 Perform a query on the table.
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634
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635 :type table: :class:`boto.dynamodb.table.Table`
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636 :param table: The Table object that is being queried.
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637
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638 :type hash_key: int|long|float|str|unicode|Binary
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639 :param hash_key: The HashKey of the requested item. The
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diff changeset
640 type of the value must match the type defined in the
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641 schema for the table.
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642
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643 :type range_key_condition: :class:`boto.dynamodb.condition.Condition`
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644 :param range_key_condition: A Condition object.
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645 Condition object can be one of the following types:
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646
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647 EQ|LE|LT|GE|GT|BEGINS_WITH|BETWEEN
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648
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649 The only condition which expects or will accept two
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650 values is 'BETWEEN', otherwise a single value should
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651 be passed to the Condition constructor.
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652
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653 :type attributes_to_get: list
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654 :param attributes_to_get: A list of attribute names.
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655 If supplied, only the specified attribute names will
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656 be returned. Otherwise, all attributes will be returned.
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657
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658 :type request_limit: int
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659 :param request_limit: The maximum number of items to retrieve
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660 from Amazon DynamoDB on each request. You may want to set
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661 a specific request_limit based on the provisioned throughput
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662 of your table. The default behavior is to retrieve as many
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663 results as possible per request.
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664
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665 :type max_results: int
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666 :param max_results: The maximum number of results that will
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667 be retrieved from Amazon DynamoDB in total. For example,
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diff changeset
668 if you only wanted to see the first 100 results from the
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diff changeset
669 query, regardless of how many were actually available, you
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670 could set max_results to 100 and the generator returned
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671 from the query method will only yeild 100 results max.
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672
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673 :type consistent_read: bool
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674 :param consistent_read: If True, a consistent read
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675 request is issued. Otherwise, an eventually consistent
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676 request is issued.
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677
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678 :type scan_index_forward: bool
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679 :param scan_index_forward: Specified forward or backward
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680 traversal of the index. Default is forward (True).
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681
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682 :type count: bool
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683 :param count: If True, Amazon DynamoDB returns a total
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684 number of items for the Query operation, even if the
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685 operation has no matching items for the assigned filter.
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686 If count is True, the actual items are not returned and
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687 the count is accessible as the ``count`` attribute of
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688 the returned object.
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689
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690 :type exclusive_start_key: list or tuple
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691 :param exclusive_start_key: Primary key of the item from
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692 which to continue an earlier query. This would be
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693 provided as the LastEvaluatedKey in that query.
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694
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695 :type item_class: Class
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diff changeset
696 :param item_class: Allows you to override the class used
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697 to generate the items. This should be a subclass of
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698 :class:`boto.dynamodb.item.Item`
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699
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700 :rtype: :class:`boto.dynamodb.layer2.TableGenerator`
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701 """
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702 if range_key_condition:
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703 rkc = self.dynamize_range_key_condition(range_key_condition)
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704 else:
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705 rkc = None
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706 if exclusive_start_key:
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707 esk = self.build_key_from_values(table.schema,
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708 *exclusive_start_key)
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709 else:
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710 esk = None
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711 kwargs = {'table_name': table.name,
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712 'hash_key_value': self.dynamizer.encode(hash_key),
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713 'range_key_conditions': rkc,
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diff changeset
714 'attributes_to_get': attributes_to_get,
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715 'limit': request_limit,
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716 'count': count,
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717 'consistent_read': consistent_read,
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718 'scan_index_forward': scan_index_forward,
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719 'exclusive_start_key': esk,
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720 'object_hook': self.dynamizer.decode}
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721 return TableGenerator(table, self.layer1.query,
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722 max_results, item_class, kwargs)
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723
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724 def scan(self, table, scan_filter=None,
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725 attributes_to_get=None, request_limit=None, max_results=None,
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726 exclusive_start_key=None, item_class=Item, count=False):
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727 """
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728 Perform a scan of DynamoDB.
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729
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730 :type table: :class:`boto.dynamodb.table.Table`
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731 :param table: The Table object that is being scanned.
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732
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733 :type scan_filter: A dict
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734 :param scan_filter: A dictionary where the key is the
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735 attribute name and the value is a
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736 :class:`boto.dynamodb.condition.Condition` object.
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737 Valid Condition objects include:
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738
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739 * EQ - equal (1)
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740 * NE - not equal (1)
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741 * LE - less than or equal (1)
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742 * LT - less than (1)
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743 * GE - greater than or equal (1)
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744 * GT - greater than (1)
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745 * NOT_NULL - attribute exists (0, use None)
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746 * NULL - attribute does not exist (0, use None)
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747 * CONTAINS - substring or value in list (1)
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748 * NOT_CONTAINS - absence of substring or value in list (1)
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749 * BEGINS_WITH - substring prefix (1)
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750 * IN - exact match in list (N)
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751 * BETWEEN - >= first value, <= second value (2)
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752
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753 :type attributes_to_get: list
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754 :param attributes_to_get: A list of attribute names.
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755 If supplied, only the specified attribute names will
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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756 be returned. Otherwise, all attributes will be returned.
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757
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758 :type request_limit: int
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759 :param request_limit: The maximum number of items to retrieve
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diff changeset
760 from Amazon DynamoDB on each request. You may want to set
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
761 a specific request_limit based on the provisioned throughput
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diff changeset
762 of your table. The default behavior is to retrieve as many
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diff changeset
763 results as possible per request.
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diff changeset
764
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765 :type max_results: int
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766 :param max_results: The maximum number of results that will
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
767 be retrieved from Amazon DynamoDB in total. For example,
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diff changeset
768 if you only wanted to see the first 100 results from the
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diff changeset
769 query, regardless of how many were actually available, you
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diff changeset
770 could set max_results to 100 and the generator returned
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771 from the query method will only yeild 100 results max.
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772
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773 :type count: bool
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774 :param count: If True, Amazon DynamoDB returns a total
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775 number of items for the Scan operation, even if the
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776 operation has no matching items for the assigned filter.
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777 If count is True, the actual items are not returned and
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778 the count is accessible as the ``count`` attribute of
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779 the returned object.
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780
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781 :type exclusive_start_key: list or tuple
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782 :param exclusive_start_key: Primary key of the item from
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783 which to continue an earlier query. This would be
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784 provided as the LastEvaluatedKey in that query.
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785
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786 :type item_class: Class
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787 :param item_class: Allows you to override the class used
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788 to generate the items. This should be a subclass of
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789 :class:`boto.dynamodb.item.Item`
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790
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791 :rtype: :class:`boto.dynamodb.layer2.TableGenerator`
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792 """
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793 if exclusive_start_key:
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794 esk = self.build_key_from_values(table.schema,
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795 *exclusive_start_key)
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796 else:
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797 esk = None
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798 kwargs = {'table_name': table.name,
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799 'scan_filter': self.dynamize_scan_filter(scan_filter),
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800 'attributes_to_get': attributes_to_get,
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801 'limit': request_limit,
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802 'count': count,
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803 'exclusive_start_key': esk,
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804 'object_hook': self.dynamizer.decode}
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805 return TableGenerator(table, self.layer1.scan,
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806 max_results, item_class, kwargs)