Mercurial > libervia-backend

annotate sat/tools/common/data_format.py @ 2650:3a8e7ec4648a

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tools (trigger, async_trigger): added no_cancel argument to point and asyncPoint when a trigger must not be cancellable
author Goffi <goffi@goffi.org>
date Sat, 11 Aug 2018 18:24:52 +0200
parents 56f94936df1e
children 8cacf7929f3c
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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
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25
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26 def dict2iter(name, dict_, pop=False):
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27 """iterate into a list serialised in a dict
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28
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29 name is the name of the key.
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30 Serialisation is done with [name] [name#1] [name#2] and so on
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31 e.g.: if name is 'group', keys are group, group#1, group#2, ...
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32 iteration stop at first missing increment
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33 Empty values are possible
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34 @param name(unicode): name of the key
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35 @param dict_(dict): dictionary with the serialised list
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36 @param pop(bool): if True, remove the value from dict
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37 @return iter: iterate through the deserialised list
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38 """
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39 if pop:
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40 get = lambda d, k: d.pop(k)
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41 else:
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42 get = lambda d, k: d[k]
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43
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44 try:
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45 yield get(dict_, name)
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46 except KeyError:
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47 return
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48 else:
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49 idx = 1
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50 while True:
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51 try:
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52 yield get(dict_, u"{}#{}".format(name, idx))
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53 except KeyError:
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54 return
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55 else:
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56 idx += 1
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57
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58
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59 def dict2iterdict(name, dict_, extra_keys, pop=False):
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60 """like dict2iter but yield dictionaries
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61
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62 params are like in [dict2iter], extra_keys is used for extra dict keys.
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63 e.g. dict2iterdict(comments, mb_data, ('node', 'service')) will yield dicts like:
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64 {u'comments': u'value1', u'node': u'value2', u'service': u'value3'}
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65 """
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66 #  FIXME: this format seem overcomplicated, it may be more appropriate to use json here
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67 if pop:
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68 get = lambda d, k: d.pop(k)
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69 else:
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70 get = lambda d, k: d[k]
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71 for idx, main_value in enumerate(dict2iter(name, dict_, pop=pop)):
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72 ret = {name: main_value}
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73 for k in extra_keys:
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74 ret[k] = get(
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75 dict_, u"{}{}_{}".format(name, (u"#" + unicode(idx)) if idx else u"", k)
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76 )
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77 yield ret
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78
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79
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80 def iter2dict(name, iter_, dict_=None, check_conflict=True):
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81 """Fill a dict with values from an iterable
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82
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83 name is used to serialise iter_, in the same way as in [dict2iter]
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84 Build from the tags a dict using the microblog data format.
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85
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86 @param name(unicode): key to use for serialisation
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87 e.g. "group" to have keys "group", "group#1", "group#2", ...
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88 @param iter_(iterable): values to store
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89 @param dict_(None, dict): dictionary to fill, or None to create one
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90 @param check_conflict(bool): if True, raise an exception in case of existing key
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91 @return (dict): filled dict, or newly created one
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92 @raise exceptions.ConflictError: a needed key already exists
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93 """
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94 if dict_ is None:
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95 dict_ = {}
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96 for idx, value in enumerate(iter_):
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97 if idx == 0:
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98 key = name
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99 else:
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100 key = u"{}#{}".format(name, idx)
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101 if check_conflict and key in dict_:
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102 raise exceptions.ConflictError
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103 dict_[key] = value
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104 return dict
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105
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106
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107 def getSubDict(name, dict_, sep=u"_"):
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108 """get a sub dictionary from a serialised dictionary
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109
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110 look for keys starting with name, and create a dict with it
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111 eg.: if "key" is looked for, {'html': 1, 'key_toto': 2, 'key_titi': 3} will return:
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112 {None: 1, toto: 2, titi: 3}
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113 @param name(unicode): name of the key
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114 @param dict_(dict): dictionary with the serialised list
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115 @param sep(unicode): separator used between name and subkey
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116 @return iter: iterate through the deserialised items
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117 """
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118 for k, v in dict_.iteritems():
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119 if k.startswith(name):
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120 if k == name:
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121 yield None, v
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122 else:
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123 if k[len(name)] != sep:
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124 continue
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125 else:
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126 yield k[len(name) + 1 :], v