Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/boto/dynamodb/types.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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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 """ |
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24 Some utility functions to deal with mapping Amazon DynamoDB types to |
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25 Python types and vice-versa. |
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26 """ |
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27 import base64 |
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28 from decimal import (Decimal, DecimalException, Context, |
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29 Clamped, Overflow, Inexact, Underflow, Rounded) |
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30 from collections import Mapping |
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31 from boto.dynamodb.exceptions import DynamoDBNumberError |
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32 from boto.compat import filter, map, six, long_type |
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33 |
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34 |
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35 DYNAMODB_CONTEXT = Context( |
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36 Emin=-128, Emax=126, rounding=None, prec=38, |
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37 traps=[Clamped, Overflow, Inexact, Rounded, Underflow]) |
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38 |
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39 |
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40 # python2.6 cannot convert floats directly to |
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41 # Decimals. This is taken from: |
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42 # http://docs.python.org/release/2.6.7/library/decimal.html#decimal-faq |
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43 def float_to_decimal(f): |
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44 n, d = f.as_integer_ratio() |
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45 numerator, denominator = Decimal(n), Decimal(d) |
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46 ctx = DYNAMODB_CONTEXT |
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47 result = ctx.divide(numerator, denominator) |
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48 while ctx.flags[Inexact]: |
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49 ctx.flags[Inexact] = False |
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50 ctx.prec *= 2 |
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51 result = ctx.divide(numerator, denominator) |
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52 return result |
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53 |
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54 |
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55 def is_num(n, boolean_as_int=True): |
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56 if boolean_as_int: |
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57 types = (int, long_type, float, Decimal, bool) |
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58 else: |
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59 types = (int, long_type, float, Decimal) |
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60 |
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61 return isinstance(n, types) or n in types |
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62 |
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63 |
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64 if six.PY2: |
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65 def is_str(n): |
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66 return (isinstance(n, basestring) or |
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67 isinstance(n, type) and issubclass(n, basestring)) |
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68 |
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69 def is_binary(n): |
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70 return isinstance(n, Binary) |
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71 |
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72 else: # PY3 |
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73 def is_str(n): |
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74 return (isinstance(n, str) or |
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75 isinstance(n, type) and issubclass(n, str)) |
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76 |
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77 def is_binary(n): |
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78 return isinstance(n, bytes) # Binary is subclass of bytes. |
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79 |
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80 |
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81 def serialize_num(val): |
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82 """Cast a number to a string and perform |
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83 validation to ensure no loss of precision. |
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84 """ |
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85 if isinstance(val, bool): |
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86 return str(int(val)) |
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87 return str(val) |
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88 |
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89 |
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90 def convert_num(s): |
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91 if '.' in s: |
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92 n = float(s) |
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93 else: |
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94 n = int(s) |
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95 return n |
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96 |
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97 |
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98 def convert_binary(n): |
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99 return Binary(base64.b64decode(n)) |
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100 |
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101 |
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102 def get_dynamodb_type(val, use_boolean=True): |
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103 """ |
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104 Take a scalar Python value and return a string representing |
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105 the corresponding Amazon DynamoDB type. If the value passed in is |
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106 not a supported type, raise a TypeError. |
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107 """ |
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108 dynamodb_type = None |
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109 if val is None: |
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110 dynamodb_type = 'NULL' |
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111 elif is_num(val): |
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112 if isinstance(val, bool) and use_boolean: |
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113 dynamodb_type = 'BOOL' |
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114 else: |
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115 dynamodb_type = 'N' |
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116 elif is_str(val): |
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117 dynamodb_type = 'S' |
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118 elif isinstance(val, (set, frozenset)): |
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119 if False not in map(is_num, val): |
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120 dynamodb_type = 'NS' |
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121 elif False not in map(is_str, val): |
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122 dynamodb_type = 'SS' |
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123 elif False not in map(is_binary, val): |
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124 dynamodb_type = 'BS' |
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125 elif is_binary(val): |
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126 dynamodb_type = 'B' |
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127 elif isinstance(val, Mapping): |
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128 dynamodb_type = 'M' |
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129 elif isinstance(val, list): |
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130 dynamodb_type = 'L' |
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131 if dynamodb_type is None: |
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132 msg = 'Unsupported type "%s" for value "%s"' % (type(val), val) |
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133 raise TypeError(msg) |
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134 return dynamodb_type |
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135 |
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136 |
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137 def dynamize_value(val): |
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138 """ |
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139 Take a scalar Python value and return a dict consisting |
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140 of the Amazon DynamoDB type specification and the value that |
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141 needs to be sent to Amazon DynamoDB. If the type of the value |
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142 is not supported, raise a TypeError |
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143 """ |
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144 dynamodb_type = get_dynamodb_type(val) |
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145 if dynamodb_type == 'N': |
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146 val = {dynamodb_type: serialize_num(val)} |
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147 elif dynamodb_type == 'S': |
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148 val = {dynamodb_type: val} |
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149 elif dynamodb_type == 'NS': |
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150 val = {dynamodb_type: list(map(serialize_num, val))} |
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151 elif dynamodb_type == 'SS': |
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152 val = {dynamodb_type: [n for n in val]} |
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153 elif dynamodb_type == 'B': |
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154 if isinstance(val, bytes): |
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155 val = Binary(val) |
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156 val = {dynamodb_type: val.encode()} |
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157 elif dynamodb_type == 'BS': |
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158 val = {dynamodb_type: [n.encode() for n in val]} |
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159 return val |
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160 |
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161 |
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162 if six.PY2: |
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163 class Binary(object): |
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164 def __init__(self, value): |
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165 if not isinstance(value, (bytes, six.text_type)): |
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166 raise TypeError('Value must be a string of binary data!') |
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167 if not isinstance(value, bytes): |
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168 value = value.encode("utf-8") |
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169 |
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170 self.value = value |
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171 |
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172 def encode(self): |
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173 return base64.b64encode(self.value).decode('utf-8') |
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174 |
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175 def __eq__(self, other): |
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176 if isinstance(other, Binary): |
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177 return self.value == other.value |
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178 else: |
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179 return self.value == other |
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180 |
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181 def __ne__(self, other): |
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182 return not self.__eq__(other) |
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183 |
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184 def __repr__(self): |
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185 return 'Binary(%r)' % self.value |
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186 |
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187 def __str__(self): |
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188 return self.value |
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189 |
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190 def __hash__(self): |
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191 return hash(self.value) |
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192 else: |
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193 class Binary(bytes): |
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194 def encode(self): |
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195 return base64.b64encode(self).decode('utf-8') |
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196 |
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197 @property |
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198 def value(self): |
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199 # This matches the public API of the Python 2 version, |
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200 # but just returns itself since it is already a bytes |
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201 # instance. |
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202 return bytes(self) |
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203 |
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204 def __repr__(self): |
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205 return 'Binary(%r)' % self.value |
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206 |
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207 |
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208 def item_object_hook(dct): |
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209 """ |
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210 A custom object hook for use when decoding JSON item bodys. |
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211 This hook will transform Amazon DynamoDB JSON responses to something |
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212 that maps directly to native Python types. |
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213 """ |
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214 if len(dct.keys()) > 1: |
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215 return dct |
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216 if 'S' in dct: |
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217 return dct['S'] |
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218 if 'N' in dct: |
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219 return convert_num(dct['N']) |
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220 if 'SS' in dct: |
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221 return set(dct['SS']) |
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222 if 'NS' in dct: |
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223 return set(map(convert_num, dct['NS'])) |
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224 if 'B' in dct: |
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225 return convert_binary(dct['B']) |
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226 if 'BS' in dct: |
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227 return set(map(convert_binary, dct['BS'])) |
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228 return dct |
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229 |
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230 |
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231 class Dynamizer(object): |
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232 """Control serialization/deserialization of types. |
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233 |
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234 This class controls the encoding of python types to the |
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235 format that is expected by the DynamoDB API, as well as |
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236 taking DynamoDB types and constructing the appropriate |
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237 python types. |
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238 |
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239 If you want to customize this process, you can subclass |
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240 this class and override the encoding/decoding of |
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241 specific types. For example:: |
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242 |
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243 'foo' (Python type) |
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244 | |
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245 v |
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246 encode('foo') |
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247 | |
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248 v |
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249 _encode_s('foo') |
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250 | |
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251 v |
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252 {'S': 'foo'} (Encoding sent to/received from DynamoDB) |
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253 | |
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254 V |
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255 decode({'S': 'foo'}) |
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256 | |
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257 v |
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258 _decode_s({'S': 'foo'}) |
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259 | |
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260 v |
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261 'foo' (Python type) |
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262 |
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263 """ |
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264 def _get_dynamodb_type(self, attr): |
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265 return get_dynamodb_type(attr) |
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266 |
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267 def encode(self, attr): |
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268 """ |
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269 Encodes a python type to the format expected |
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270 by DynamoDB. |
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271 |
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272 """ |
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273 dynamodb_type = self._get_dynamodb_type(attr) |
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274 try: |
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275 encoder = getattr(self, '_encode_%s' % dynamodb_type.lower()) |
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276 except AttributeError: |
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277 raise ValueError("Unable to encode dynamodb type: %s" % |
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278 dynamodb_type) |
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279 return {dynamodb_type: encoder(attr)} |
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280 |
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281 def _encode_n(self, attr): |
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282 try: |
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283 if isinstance(attr, float) and not hasattr(Decimal, 'from_float'): |
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284 # python2.6 does not support creating Decimals directly |
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285 # from floats so we have to do this ourself. |
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286 n = str(float_to_decimal(attr)) |
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287 else: |
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288 n = str(DYNAMODB_CONTEXT.create_decimal(attr)) |
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289 if list(filter(lambda x: x in n, ('Infinity', 'NaN'))): |
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290 raise TypeError('Infinity and NaN not supported') |
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291 return n |
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292 except (TypeError, DecimalException) as e: |
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293 msg = '{0} numeric for `{1}`\n{2}'.format( |
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294 e.__class__.__name__, attr, str(e) or '') |
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295 raise DynamoDBNumberError(msg) |
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296 |
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297 def _encode_s(self, attr): |
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298 if isinstance(attr, bytes): |
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299 attr = attr.decode('utf-8') |
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300 elif not isinstance(attr, six.text_type): |
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301 attr = str(attr) |
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302 return attr |
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303 |
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304 def _encode_ns(self, attr): |
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305 return list(map(self._encode_n, attr)) |
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306 |
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307 def _encode_ss(self, attr): |
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308 return [self._encode_s(n) for n in attr] |
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309 |
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310 def _encode_b(self, attr): |
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311 if isinstance(attr, bytes): |
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312 attr = Binary(attr) |
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313 return attr.encode() |
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314 |
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315 def _encode_bs(self, attr): |
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316 return [self._encode_b(n) for n in attr] |
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317 |
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318 def _encode_null(self, attr): |
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319 return True |
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320 |
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321 def _encode_bool(self, attr): |
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322 return attr |
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323 |
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324 def _encode_m(self, attr): |
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325 return dict([(k, self.encode(v)) for k, v in attr.items()]) |
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326 |
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327 def _encode_l(self, attr): |
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328 return [self.encode(i) for i in attr] |
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329 |
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330 def decode(self, attr): |
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331 """ |
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332 Takes the format returned by DynamoDB and constructs |
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333 the appropriate python type. |
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334 |
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335 """ |
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336 if len(attr) > 1 or not attr or is_str(attr): |
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337 return attr |
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338 dynamodb_type = list(attr.keys())[0] |
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339 if dynamodb_type.lower() == dynamodb_type: |
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340 # It's not an actual type, just a single character attr that |
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341 # overlaps with the DDB types. Return it. |
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342 return attr |
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343 try: |
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344 decoder = getattr(self, '_decode_%s' % dynamodb_type.lower()) |
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345 except AttributeError: |
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346 return attr |
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347 return decoder(attr[dynamodb_type]) |
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348 |
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349 def _decode_n(self, attr): |
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350 return DYNAMODB_CONTEXT.create_decimal(attr) |
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351 |
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352 def _decode_s(self, attr): |
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353 return attr |
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354 |
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355 def _decode_ns(self, attr): |
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356 return set(map(self._decode_n, attr)) |
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357 |
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358 def _decode_ss(self, attr): |
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359 return set(map(self._decode_s, attr)) |
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360 |
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361 def _decode_b(self, attr): |
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362 return convert_binary(attr) |
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363 |
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364 def _decode_bs(self, attr): |
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365 return set(map(self._decode_b, attr)) |
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366 |
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367 def _decode_null(self, attr): |
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368 return None |
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369 |
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370 def _decode_bool(self, attr): |
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371 return attr |
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372 |
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373 def _decode_m(self, attr): |
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374 return dict([(k, self.decode(v)) for k, v in attr.items()]) |
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375 |
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376 def _decode_l(self, attr): |
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377 return [self.decode(i) for i in attr] |
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378 |
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379 |
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380 class NonBooleanDynamizer(Dynamizer): |
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381 """Casting boolean type to numeric types. |
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382 |
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383 This class is provided for backward compatibility. |
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384 """ |
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385 def _get_dynamodb_type(self, attr): |
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386 return get_dynamodb_type(attr, use_boolean=False) |
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387 |
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388 |
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389 class LossyFloatDynamizer(NonBooleanDynamizer): |
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390 """Use float/int instead of Decimal for numeric types. |
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391 |
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392 This class is provided for backwards compatibility. Instead of |
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393 using Decimals for the 'N', 'NS' types it uses ints/floats. |
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394 |
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395 This class is deprecated and its usage is not encouraged, |
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396 as doing so may result in loss of precision. Use the |
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397 `Dynamizer` class instead. |
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398 |
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399 """ |
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400 def _encode_n(self, attr): |
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401 return serialize_num(attr) |
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402 |
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403 def _encode_ns(self, attr): |
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404 return [str(i) for i in attr] |
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405 |
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406 def _decode_n(self, attr): |
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407 return convert_num(attr) |
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408 |
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409 def _decode_ns(self, attr): |
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410 return set(map(self._decode_n, attr)) |