Mercurial > libervia-backend

annotate libervia/backend/tools/common/data_format.py @ 4118:07370d2a9bde

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plugin XEP-0167: keep media order when starting a call: media content order is relevant when building Jingle contents/SDP notably for bundling. This patch fixes the previous behaviour of always using the same order by keeping the order of the data (i.e. order of original SDP offer). Previous behaviour could lead to call failure. rel 424
author Goffi <goffi@goffi.org>
date Tue, 03 Oct 2023 15:15:24 +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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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