Mercurial > libervia-backend

annotate libervia/backend/tools/common/data_format.py @ 4108:238e305f2306

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author Goffi <goffi@goffi.org>
date Thu, 06 Jul 2023 11:34:51 +0200
parents 4b842c1fb686
children 79c8a70e1813
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rev   line source
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1 #!/usr/bin/env python3
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2
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3
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4 # SAT: a jabber client
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5 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 """ tools common to backend and frontends """
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21 #  FIXME: json may be more appropriate than manual serialising like done here
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22
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23 from typing import Any
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24
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25 from libervia.backend.core import exceptions
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26 import json
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29 def dict2iter(name, dict_, pop=False):
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30 """iterate into a list serialised in a dict
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31
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32 name is the name of the key.
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33 Serialisation is done with [name] [name#1] [name#2] and so on
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34 e.g.: if name is 'group', keys are group, group#1, group#2, ...
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35 iteration stop at first missing increment
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36 Empty values are possible
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37 @param name(unicode): name of the key
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38 @param dict_(dict): dictionary with the serialised list
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39 @param pop(bool): if True, remove the value from dict
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40 @return iter: iterate through the deserialised list
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41 """
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42 if pop:
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43 get = lambda d, k: d.pop(k)
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44 else:
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45 get = lambda d, k: d[k]
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47 try:
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48 yield get(dict_, name)
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49 except KeyError:
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50 return
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51 else:
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52 idx = 1
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53 while True:
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54 try:
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55 yield get(dict_, "{}#{}".format(name, idx))
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56 except KeyError:
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57 return
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58 else:
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59 idx += 1
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61
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62 def dict2iterdict(name, dict_, extra_keys, pop=False):
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63 """like dict2iter but yield dictionaries
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64
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65 params are like in [dict2iter], extra_keys is used for extra dict keys.
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66 e.g. dict2iterdict(comments, mb_data, ('node', 'service')) will yield dicts like:
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67 {u'comments': u'value1', u'node': u'value2', u'service': u'value3'}
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68 """
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69 #  FIXME: this format seem overcomplicated, it may be more appropriate to use json here
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70 if pop:
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71 get = lambda d, k: d.pop(k)
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72 else:
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73 get = lambda d, k: d[k]
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74 for idx, main_value in enumerate(dict2iter(name, dict_, pop=pop)):
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75 ret = {name: main_value}
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76 for k in extra_keys:
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77 ret[k] = get(
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78 dict_, "{}{}_{}".format(name, ("#" + str(idx)) if idx else "", k)
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79 )
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80 yield ret
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81
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82
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83 def iter2dict(name, iter_, dict_=None, check_conflict=True):
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84 """Fill a dict with values from an iterable
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85
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86 name is used to serialise iter_, in the same way as in [dict2iter]
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87 Build from the tags a dict using the microblog data format.
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88
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89 @param name(unicode): key to use for serialisation
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90 e.g. "group" to have keys "group", "group#1", "group#2", ...
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91 @param iter_(iterable): values to store
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92 @param dict_(None, dict): dictionary to fill, or None to create one
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93 @param check_conflict(bool): if True, raise an exception in case of existing key
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94 @return (dict): filled dict, or newly created one
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95 @raise exceptions.ConflictError: a needed key already exists
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96 """
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97 if dict_ is None:
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98 dict_ = {}
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99 for idx, value in enumerate(iter_):
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100 if idx == 0:
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101 key = name
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102 else:
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103 key = "{}#{}".format(name, idx)
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104 if check_conflict and key in dict_:
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105 raise exceptions.ConflictError
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106 dict_[key] = value
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107 return dict
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108
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109
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110 def get_sub_dict(name, dict_, sep="_"):
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111 """get a sub dictionary from a serialised dictionary
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112
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113 look for keys starting with name, and create a dict with it
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114 eg.: if "key" is looked for, {'html': 1, 'key_toto': 2, 'key_titi': 3} will return:
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115 {None: 1, toto: 2, titi: 3}
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116 @param name(unicode): name of the key
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117 @param dict_(dict): dictionary with the serialised list
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118 @param sep(unicode): separator used between name and subkey
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119 @return iter: iterate through the deserialised items
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120 """
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121 for k, v in dict_.items():
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122 if k.startswith(name):
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123 if k == name:
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124 yield None, v
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125 else:
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126 if k[len(name)] != sep:
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127 continue
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128 else:
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129 yield k[len(name) + 1 :], v
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130
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131 def serialise(data):
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132 """Serialise data so it can be sent to bridge
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133
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134 @return(unicode): serialised data, can be transmitted as string to the bridge
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135 """
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136 return json.dumps(data, ensure_ascii=False, default=str)
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137
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138 def deserialise(serialised_data: str, default: Any = None, type_check: type = dict):
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139 """Deserialize data from bridge
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140
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141 @param serialised_data(unicode): data to deserialise
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142 @default (object): value to use when serialised data is empty string
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143 @param type_check(type): if not None, the deserialised data must be of this type
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144 @return(object): deserialised data
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145 @raise ValueError: serialised_data is of wrong type
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146 """
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147 if serialised_data == "":
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148 return default
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149 ret = json.loads(serialised_data)
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150 if type_check is not None and not isinstance(ret, type_check):
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151 raise ValueError("Bad data type, was expecting {type_check}, got {real_type}"
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152 .format(type_check=type_check, real_type=type(ret)))
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153 return ret