Mercurial > libervia-backend

annotate sat/tools/common/data_format.py @ 2656:8cacf7929f3c

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tools (common/data_format): added serialise and deserialise methods (using json for now)
author Goffi <goffi@goffi.org>
date Sat, 11 Aug 2018 18:24:55 +0200
parents 56f94936df1e
children fcc945537d5f
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rev   line source
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2daf7b4c6756 use of /usr/bin/env instead of /usr/bin/python in shebang
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1 #!/usr/bin/env python2
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT: a jabber client
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5 # Copyright (C) 2009-2018 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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23 from sat.core import exceptions
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24 import json
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25
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26
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27 def dict2iter(name, dict_, pop=False):
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28 """iterate into a list serialised in a dict
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29
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30 name is the name of the key.
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31 Serialisation is done with [name] [name#1] [name#2] and so on
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32 e.g.: if name is 'group', keys are group, group#1, group#2, ...
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33 iteration stop at first missing increment
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34 Empty values are possible
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35 @param name(unicode): name of the key
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36 @param dict_(dict): dictionary with the serialised list
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37 @param pop(bool): if True, remove the value from dict
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38 @return iter: iterate through the deserialised list
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39 """
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40 if pop:
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41 get = lambda d, k: d.pop(k)
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42 else:
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43 get = lambda d, k: d[k]
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44
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45 try:
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46 yield get(dict_, name)
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47 except KeyError:
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48 return
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49 else:
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50 idx = 1
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51 while True:
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52 try:
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53 yield get(dict_, u"{}#{}".format(name, idx))
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54 except KeyError:
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55 return
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56 else:
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57 idx += 1
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58
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59
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60 def dict2iterdict(name, dict_, extra_keys, pop=False):
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61 """like dict2iter but yield dictionaries
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62
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63 params are like in [dict2iter], extra_keys is used for extra dict keys.
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64 e.g. dict2iterdict(comments, mb_data, ('node', 'service')) will yield dicts like:
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65 {u'comments': u'value1', u'node': u'value2', u'service': u'value3'}
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66 """
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67 #  FIXME: this format seem overcomplicated, it may be more appropriate to use json here
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68 if pop:
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69 get = lambda d, k: d.pop(k)
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70 else:
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71 get = lambda d, k: d[k]
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72 for idx, main_value in enumerate(dict2iter(name, dict_, pop=pop)):
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73 ret = {name: main_value}
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74 for k in extra_keys:
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75 ret[k] = get(
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76 dict_, u"{}{}_{}".format(name, (u"#" + unicode(idx)) if idx else u"", k)
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77 )
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78 yield ret
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79
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80
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81 def iter2dict(name, iter_, dict_=None, check_conflict=True):
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82 """Fill a dict with values from an iterable
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83
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84 name is used to serialise iter_, in the same way as in [dict2iter]
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85 Build from the tags a dict using the microblog data format.
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86
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87 @param name(unicode): key to use for serialisation
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88 e.g. "group" to have keys "group", "group#1", "group#2", ...
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89 @param iter_(iterable): values to store
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90 @param dict_(None, dict): dictionary to fill, or None to create one
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91 @param check_conflict(bool): if True, raise an exception in case of existing key
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92 @return (dict): filled dict, or newly created one
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93 @raise exceptions.ConflictError: a needed key already exists
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94 """
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95 if dict_ is None:
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96 dict_ = {}
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97 for idx, value in enumerate(iter_):
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98 if idx == 0:
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99 key = name
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100 else:
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101 key = u"{}#{}".format(name, idx)
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102 if check_conflict and key in dict_:
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103 raise exceptions.ConflictError
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104 dict_[key] = value
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105 return dict
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106
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107
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108 def getSubDict(name, dict_, sep=u"_"):
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109 """get a sub dictionary from a serialised dictionary
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110
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111 look for keys starting with name, and create a dict with it
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112 eg.: if "key" is looked for, {'html': 1, 'key_toto': 2, 'key_titi': 3} will return:
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113 {None: 1, toto: 2, titi: 3}
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114 @param name(unicode): name of the key
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115 @param dict_(dict): dictionary with the serialised list
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116 @param sep(unicode): separator used between name and subkey
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117 @return iter: iterate through the deserialised items
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118 """
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119 for k, v in dict_.iteritems():
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120 if k.startswith(name):
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121 if k == name:
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122 yield None, v
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123 else:
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124 if k[len(name)] != sep:
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125 continue
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126 else:
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127 yield k[len(name) + 1 :], v
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128
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129 def serialise(data):
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130 """Serialise data so it can be sent to bridge
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131
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132 @return(unicode): serialised data, can be transmitted as string to the bridge
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133 """
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134 return json.dumps(data, ensure_ascii=False)
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135
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136 def deserialise(serialised_data):
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137 """Deserialize data from bridge
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138
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139 @param serialised_data(unicode): data to deserialise
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140 @return(object): deserialised data
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141 """
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142 return json.loads(serialised_data)