Mercurial > libervia-backend
view sat/tools/common/data_format.py @ 2969:eafea3bcf111
jp (blog/preview): fixed call to getCurrentFile
author | Goffi <goffi@goffi.org> |
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date | Thu, 27 Jun 2019 20:24:14 +0200 |
parents | 003b8b4b56a7 |
children | ab2696e34d29 |
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#!/usr/bin/env python2 # -*- coding: utf-8 -*- # SAT: a jabber client # Copyright (C) 2009-2019 Jérôme Poisson (goffi@goffi.org) # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU Affero General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU Affero General Public License for more details. # You should have received a copy of the GNU Affero General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. """ tools common to backend and frontends """ # FIXME: json may be more appropriate than manual serialising like done here from sat.core import exceptions import json def dict2iter(name, dict_, pop=False): """iterate into a list serialised in a dict name is the name of the key. Serialisation is done with [name] [name#1] [name#2] and so on e.g.: if name is 'group', keys are group, group#1, group#2, ... iteration stop at first missing increment Empty values are possible @param name(unicode): name of the key @param dict_(dict): dictionary with the serialised list @param pop(bool): if True, remove the value from dict @return iter: iterate through the deserialised list """ if pop: get = lambda d, k: d.pop(k) else: get = lambda d, k: d[k] try: yield get(dict_, name) except KeyError: return else: idx = 1 while True: try: yield get(dict_, u"{}#{}".format(name, idx)) except KeyError: return else: idx += 1 def dict2iterdict(name, dict_, extra_keys, pop=False): """like dict2iter but yield dictionaries params are like in [dict2iter], extra_keys is used for extra dict keys. e.g. dict2iterdict(comments, mb_data, ('node', 'service')) will yield dicts like: {u'comments': u'value1', u'node': u'value2', u'service': u'value3'} """ # FIXME: this format seem overcomplicated, it may be more appropriate to use json here if pop: get = lambda d, k: d.pop(k) else: get = lambda d, k: d[k] for idx, main_value in enumerate(dict2iter(name, dict_, pop=pop)): ret = {name: main_value} for k in extra_keys: ret[k] = get( dict_, u"{}{}_{}".format(name, (u"#" + unicode(idx)) if idx else u"", k) ) yield ret def iter2dict(name, iter_, dict_=None, check_conflict=True): """Fill a dict with values from an iterable name is used to serialise iter_, in the same way as in [dict2iter] Build from the tags a dict using the microblog data format. @param name(unicode): key to use for serialisation e.g. "group" to have keys "group", "group#1", "group#2", ... @param iter_(iterable): values to store @param dict_(None, dict): dictionary to fill, or None to create one @param check_conflict(bool): if True, raise an exception in case of existing key @return (dict): filled dict, or newly created one @raise exceptions.ConflictError: a needed key already exists """ if dict_ is None: dict_ = {} for idx, value in enumerate(iter_): if idx == 0: key = name else: key = u"{}#{}".format(name, idx) if check_conflict and key in dict_: raise exceptions.ConflictError dict_[key] = value return dict def getSubDict(name, dict_, sep=u"_"): """get a sub dictionary from a serialised dictionary look for keys starting with name, and create a dict with it eg.: if "key" is looked for, {'html': 1, 'key_toto': 2, 'key_titi': 3} will return: {None: 1, toto: 2, titi: 3} @param name(unicode): name of the key @param dict_(dict): dictionary with the serialised list @param sep(unicode): separator used between name and subkey @return iter: iterate through the deserialised items """ for k, v in dict_.iteritems(): if k.startswith(name): if k == name: yield None, v else: if k[len(name)] != sep: continue else: yield k[len(name) + 1 :], v def serialise(data): """Serialise data so it can be sent to bridge @return(unicode): serialised data, can be transmitted as string to the bridge """ return json.dumps(data, ensure_ascii=False, default=unicode) def deserialise(serialised_data, default=None, type_check=dict): """Deserialize data from bridge @param serialised_data(unicode): data to deserialise @default (object): value to use when serialised data is empty string @param type_check(type): if not None, the deserialised data must be of this type @return(object): deserialised data @raise ValueError: serialised_data is of wrong type """ if serialised_data == u"": return default ret = json.loads(serialised_data) if type_check is not None and not isinstance(ret, type_check): raise ValueError(u"Bad data type, was expecting {type_check}, got {real_type}" .format(type_check=type_check, real_type=type(ret))) return ret