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annotate piecrust/fastpickle.py @ 585:25df894f9ab9

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internal: Some fixes to the new app configuration. * Tweak order of source registration. * Add some missing default settings. * Fix some validation code. * Add better error handling to validation.
author Ludovic Chabant <ludovic@chabant.com>
date Sat, 02 Jan 2016 16:39:26 -0800
parents b015e38d4ee1
children 9e5393fcfab2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 import sys
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2 import json
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3 import datetime
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4 import collections
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7 def pickle(obj):
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8 data = _pickle_object(obj)
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9 data = json.dumps(data, indent=None, separators=(',', ':'))
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10 return data.encode('utf8')
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13 def unpickle(data):
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14 data = data.decode('utf8')
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15 data = json.loads(data)
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16 return _unpickle_object(data)
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18
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19 _PICKLING = 0
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20 _UNPICKLING = 1
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22 _identity_dispatch = object()
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25 def _tuple_convert(obj, func, op):
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26 if op == _PICKLING:
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27 return ['__type__:tuple'] + [func(c) for c in obj]
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28 elif op == _UNPICKLING:
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29 return tuple([func(c) for c in obj[1:]])
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32 def _list_convert(obj, func, op):
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33 return [func(c) for c in obj]
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36 def _dict_convert(obj, func, op):
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37 res = {}
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38 for k, v in obj.items():
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39 res[k] = func(v)
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40 return res
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42
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43 def _ordered_dict_convert(obj, func, op):
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44 if op == _PICKLING:
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45 res = {'__type__': 'OrderedDict'}
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46 for k, v in obj.items():
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47 res[k] = func(v)
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48 return res
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49 elif op == _UNPICKLING:
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50 res = collections.OrderedDict()
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51 for k, v in obj.items():
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52 res[k] = func(v)
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53 return res
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55
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56 def _set_convert(obj, func, op):
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57 if op == _PICKLING:
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58 return ['__type__:set'] + [func(c) for c in obj]
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59 elif op == _UNPICKLING:
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60 return set([func(c) for c in obj[1:]])
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63 def _date_convert(obj, func, op):
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64 if op == _PICKLING:
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65 return {'__class__': 'date',
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66 'year': obj.year,
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67 'month': obj.month,
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68 'day': obj.day}
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69 elif op == _UNPICKLING:
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70 return datetime.date(
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71 obj['year'], obj['month'], obj['day'])
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73
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74 def _datetime_convert(obj, func, op):
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75 if op == _PICKLING:
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76 return {'__class__': 'datetime',
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77 'year': obj.year,
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78 'month': obj.month,
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79 'day': obj.day,
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80 'hour': obj.hour,
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81 'minute': obj.minute,
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82 'second': obj.second,
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83 'microsecond': obj.microsecond}
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84 elif op == _UNPICKLING:
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85 return datetime.datetime(
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86 obj['year'], obj['month'], obj['day'],
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87 obj['hour'], obj['minute'], obj['second'], obj['microsecond'])
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89
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90 def _time_convert(obj, func, op):
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91 if op == _PICKLING:
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92 return {'__class__': 'time',
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93 'hour': obj.hour,
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94 'minute': obj.minute,
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95 'second': obj.second,
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96 'microsecond': obj.microsecond}
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97 elif op == _UNPICKLING:
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98 return datetime.time(
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99 obj['hour'], obj['minute'], obj['second'], obj['microsecond'])
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100
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101
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102 _type_convert = {
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103 type(None): _identity_dispatch,
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104 bool: _identity_dispatch,
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105 int: _identity_dispatch,
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106 float: _identity_dispatch,
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107 str: _identity_dispatch,
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108 datetime.date: _date_convert,
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109 datetime.datetime: _datetime_convert,
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110 datetime.time: _time_convert,
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111 tuple: _tuple_convert,
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112 list: _list_convert,
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113 dict: _dict_convert,
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114 set: _set_convert,
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115 collections.OrderedDict: _ordered_dict_convert,
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116 }
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117
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118
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119 _type_unconvert = {
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120 type(None): _identity_dispatch,
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121 bool: _identity_dispatch,
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122 int: _identity_dispatch,
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123 float: _identity_dispatch,
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124 str: _identity_dispatch,
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125 'date': _date_convert,
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126 'datetime': _datetime_convert,
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127 'time': _time_convert,
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128 }
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129
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130
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131 _collection_unconvert = {
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132 '__type__:tuple': _tuple_convert,
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133 '__type__:set': _set_convert,
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134 }
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135
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136
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137 _mapping_unconvert = {
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138 'OrderedDict': _ordered_dict_convert
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139 }
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140
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141
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142 def _pickle_object(obj):
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143 t = type(obj)
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144 conv = _type_convert.get(t)
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145
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146 # Object doesn't need conversion?
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147 if conv is _identity_dispatch:
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148 return obj
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149
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150 # Object has special conversion?
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151 if conv is not None:
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152 return conv(obj, _pickle_object, _PICKLING)
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153
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154 # Use instance dictionary, or a custom state.
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155 getter = getattr(obj, '__getstate__', None)
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156 if getter is not None:
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157 state = getter()
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158 else:
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159 state = obj.__dict__
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160
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161 state = _dict_convert(state, _pickle_object, _PICKLING)
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162 state['__class__'] = obj.__class__.__name__
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163 state['__module__'] = obj.__class__.__module__
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164
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165 return state
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166
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167
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168 def _unpickle_object(state):
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169 t = type(state)
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170 conv = _type_unconvert.get(t)
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171
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172 # Object doesn't need conversion?
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173 if conv is _identity_dispatch:
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174 return state
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175
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176 # Try collection or mapping conversion.
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177 if t is list:
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178 try:
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179 col_type = state[0]
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180 if not isinstance(col_type, str):
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181 col_type = None
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182 except IndexError:
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183 col_type = None
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184 if col_type is not None:
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185 conv = _collection_unconvert.get(col_type)
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186 if conv is not None:
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187 return conv(state, _unpickle_object, _UNPICKLING)
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188 return _list_convert(state, _unpickle_object, _UNPICKLING)
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189
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190 assert t is dict
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191
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192 # Custom mapping type?
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193 map_type = state.get('__type__')
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194 if map_type:
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195 conv = _mapping_unconvert.get(map_type)
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196 return conv(state, _unpickle_object, _UNPICKLING)
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197
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198 # Class instance or other custom type.
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199 class_name = state.get('__class__')
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200 if class_name is None:
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201 return _dict_convert(state, _unpickle_object, _UNPICKLING)
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202
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203 conv = _type_unconvert.get(class_name)
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204 if conv is not None:
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205 return conv(state, _unpickle_object, _UNPICKLING)
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206
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207 mod_name = state['__module__']
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208 mod = sys.modules[mod_name]
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209 class_def = getattr(mod, class_name)
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210 obj = class_def.__new__(class_def)
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211
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212 del state['__class__']
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213 del state['__module__']
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214 attr_names = list(state.keys())
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215 for name in attr_names:
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216 state[name] = _unpickle_object(state[name])
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217
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218 obj.__dict__.update(state)
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219
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220 return obj
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221