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annotate src/memory/disco.py @ 973:4a8903021fda

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core (disco): findFeaturesSet and findServiceEntities don't use inlineCallbacks anymore, that allow a better error management (no more anonying debugger raise when discoInfo fails in debug mode)
author Goffi <goffi@goffi.org>
date Wed, 02 Apr 2014 12:31:23 +0200
parents 723f28cd15c7
children 301b342c697a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #!/usr/bin/python
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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, 2010, 2011, 2012, 2013, 2014 Jérôme Poisson (goffi@goffi.org)
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6
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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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16
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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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19
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20 from sat.core.i18n import _
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21 from sat.core import exceptions
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22 from logging import debug, info, warning, error
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23 from twisted.words.protocols.jabber import jid
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24 from twisted.words.protocols.jabber.error import StanzaError
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25 from twisted.internet import defer
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26 from sat.core.constants import Const as C
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27 from wokkel import disco
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28 from base64 import b64encode
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29 from hashlib import sha1
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31
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32 PRESENCE = '/presence'
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33 NS_ENTITY_CAPABILITY = 'http://jabber.org/protocol/caps'
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34 CAPABILITY_UPDATE = PRESENCE + '/c[@xmlns="' + NS_ENTITY_CAPABILITY + '"]'
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35
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36 class HashGenerationError(Exception):
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37 pass
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39
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40 class ByteIdentity(object):
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41 """This class manage identity as bytes (needed for i;octet sort), it is used for the hash generation"""
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42
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43 def __init__(self, identity, lang=None):
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44 assert isinstance(identity, disco.DiscoIdentity)
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45 self.category = identity.category.encode('utf-8')
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46 self.idType = identity.type.encode('utf-8')
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47 self.name = identity.name.encode('utf-8') if identity.name else ''
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48 self.lang = lang.encode('utf-8') if lang is not None else ''
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49
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50 def __str__(self):
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51 return "%s/%s/%s/%s" % (self.category, self.idType, self.lang, self.name)
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52
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53
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54 class Discovery(object):
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55 """ Manage capabilities of entities """
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56
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57 def __init__(self, host):
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58 self.host = host
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59 self.hashes = {} # key: capability hash, value: disco features/identities
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60 # TODO: save hashes in databse, remove legacy hashes
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61
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62 @defer.inlineCallbacks
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63 def hasFeature(self, feature, jid_=None, profile_key=C.PROF_KEY_NONE):
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64 """Tell if an entity has the required feature
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65
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66 @param feature: feature namespace
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67 @param jid_: jid of the target, or None for profile's server
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68 @param profile_key: %(doc_profile_key)s
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69 @return: a Deferred which fire a boolean (True if feature is available)
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70 """
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71 disco_infos = yield self.getInfos(jid_, profile_key)
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72 defer.returnValue(feature in disco_infos.features)
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74 @defer.inlineCallbacks
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75 def checkFeature(self, feature, jid_=None, profile_key=C.PROF_KEY_NONE):
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76 """Like hasFeature, but raise an exception is feature is not Found
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77
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78 @param feature: feature namespace
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79 @param jid_: jid of the target, or None for profile's server
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80 @param profile_key: %(doc_profile_key)s
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81 @return: None if feature is found
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82
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83 @raise: exceptions.FeatureNotFound
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84 """
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85 disco_infos = yield self.getInfos(jid_, profile_key)
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86 if not feature in disco_infos.features:
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87 raise exceptions.FeatureNotFound
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88 defer.returnValue(feature in disco_infos)
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90 def getInfos(self, jid_=None, profile_key=C.PROF_KEY_NONE):
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91 """get disco infos from jid_, filling capability hash if needed
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93 @param jid_: jid of the target, or None for profile's server
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94 @param profile_key: %(doc_profile_key)s
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95 @return: a Deferred which fire disco.DiscoInfo
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96 """
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97 client = self.host.getClient(profile_key)
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98 if jid_ is None:
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99 jid_ = jid.JID(client.jid.host)
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100 try:
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101 cap_hash = self.host.memory.getEntityData(jid_, [C.ENTITY_CAP_HASH], client.profile)[C.ENTITY_CAP_HASH]
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102 disco_infos = self.hashes[cap_hash]
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103 return defer.succeed(disco_infos)
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104 except KeyError:
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105 # capability hash is not available, we'll compute one
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106 def infosCb(disco_infos):
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107 cap_hash = self.generateHash(disco_infos)
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108 self.hashes[cap_hash] = disco_infos
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109 self.host.memory.updateEntityData(jid_, C.ENTITY_CAP_HASH, cap_hash, client.profile)
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110 return disco_infos
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111 d = client.disco.requestInfo(jid_)
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112 d.addCallback(infosCb)
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113 return d
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114
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115 @defer.inlineCallbacks
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116 def getItems(self, jid_=None, profile_key=C.PROF_KEY_NONE):
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117 """get disco items from jid_, cache them for our own server
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118
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119 @param jid_: jid of the target, or None for profile's server
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120 @param profile_key: %(doc_profile_key)s
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121 @return: a Deferred which fire disco.DiscoItems
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122 """
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123 client = self.host.getClient(profile_key)
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124 if jid_ is None:
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125 jid_ = jid.JID(client.jid.host)
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126 # we cache items only for our own server
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127 try:
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128 items = self.host.memory.getEntityData(jid_, ["DISCO_ITEMS"], client.profile)["DISCO_ITEMS"]
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129 debug("[%s] disco items are in cache" % jid_.full())
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130 except KeyError:
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131 debug("Caching [%s] disco items" % jid_.full())
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132 items = yield client.disco.requestItems(jid_)
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133 self.host.memory.updateEntityData(jid_, "DISCO_ITEMS", items, client.profile)
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134 else:
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135 items = yield client.disco.requestItems(jid_)
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136
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137 defer.returnValue(items)
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138
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139
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140 def _infosEb(self, failure, entity_jid):
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141 failure.trap(StanzaError)
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142 warning(_("Error while requesting [%(jid)s]: %(error)s") % {'jid': entity_jid.full(),
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143 'error': failure.getErrorMessage()})
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144
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145 def findServiceEntities(self, category, type_, jid_=None, profile_key=C.PROF_KEY_NONE):
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146 """Return all available items of an entity which correspond to (category, type_)
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147
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148 @param category: identity's category
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149 @param type_: identitiy's type
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150 @param jid_: the jid of the target server (None for profile's server)
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151 @param profile_key: %(doc_profile_key)s
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152 @return: a set of entities or None if no cached data were found
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153 """
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154 found_entities = set()
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155
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156 def infosCb(infos, entity_jid):
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157 if (category, type_) in infos.identities:
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158 found_entities.add(entity_jid)
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159
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160 def gotItems(items):
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161 defers_list = []
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162 for item in items:
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163 info_d = self.getInfos(item.entity, profile_key)
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164 info_d.addCallbacks(infosCb, self._infosEb, [item.entity], None, [item.entity])
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165 defers_list.append(info_d)
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166 return defer.DeferredList(defers_list)
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167
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168 d = self.getItems(jid_, profile_key)
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169 d.addCallback(gotItems)
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170 d.addCallback(lambda dummy: found_entities)
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171 return d
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172
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173 def findFeaturesSet(self, features, category=None, type_=None, jid_=None, profile_key=C.PROF_KEY_NONE):
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174 """Return entities (including jid_ and its items) offering features
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175
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176 @param features: iterable of features which must be present
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177 @param category: if not None, accept only this category
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178 @param type_: if not None, accept only this type
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179 @param jid_: the jid of the target server (None for profile's server)
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180 @param profile_key: %(doc_profile_key)s
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181 @return: a set of found entities
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182 """
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183 client = self.host.getClient(profile_key)
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184 if jid_ is None:
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185 jid_ = jid.JID(client.jid.host)
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186 features = set(features)
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187 found_entities = set()
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188
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189 def infosCb(infos, entity):
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190 if category is not None or type_ is not None:
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191 categories = set()
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192 types = set()
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193 for identity in infos.identities:
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194 id_cat, id_type = identity
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195 categories.add(id_cat)
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196 types.add(id_type)
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197 if category is not None and category not in categories:
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198 return
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199 if type_ is not None and type_ not in types:
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200 return
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201 if features.issubset(infos.features):
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202 found_entities.add(entity)
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203
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204 def gotItems(items):
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205 defer_list = []
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206 for entity in [jid_] + [item.entity for item in items]:
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207 infos_d = self.getInfos(entity, profile_key)
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208 infos_d.addCallbacks(infosCb, self._infosEb, [entity], None, [entity])
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diff changeset
209 defer_list.append(infos_d)
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210 return defer.DeferredList(defer_list)
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211
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212 d = self.getItems(jid_, profile_key)
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213 d.addCallback(gotItems)
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214 d.addCallback(lambda dummy: found_entities)
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215 return d
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216
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217 def generateHash(self, services):
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218 """ Generate a unique hash for given service
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219
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220 hash algorithm is the one described in XEP-0115
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221 @param services: iterable of disco.DiscoIdentity/disco.DiscoFeature, as returned by discoHandler.info
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diff changeset
222
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223 """
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224 s = []
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diff changeset
225 byte_identities = [ByteIdentity(service) for service in services if isinstance(service, disco.DiscoIdentity)] # FIXME: lang must be managed here
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diff changeset
226 byte_identities.sort(key=lambda i: i.lang)
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diff changeset
227 byte_identities.sort(key=lambda i: i.idType)
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Goffi <goffi@goffi.org>
parents: 941
diff changeset
228 byte_identities.sort(key=lambda i: i.category)
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Goffi <goffi@goffi.org>
parents: 941
diff changeset
229 for identity in byte_identities:
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Goffi <goffi@goffi.org>
parents: 941
diff changeset
230 s.append(str(identity))
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Goffi <goffi@goffi.org>
parents: 941
diff changeset
231 s.append('<')
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
diff changeset
232 byte_features = [service.encode('utf-8') for service in services if isinstance(service, disco.DiscoFeature)]
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
diff changeset
233 byte_features.sort() # XXX: the default sort has the same behaviour as the requested RFC 4790 i;octet sort
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Goffi <goffi@goffi.org>
parents: 941
diff changeset
234 for feature in byte_features:
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Goffi <goffi@goffi.org>
parents: 941
diff changeset
235 s.append(feature)
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
diff changeset
236 s.append('<')
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
diff changeset
237 #TODO: manage XEP-0128 data form here
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
diff changeset
238 cap_hash = b64encode(sha1(''.join(s)).digest())
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
diff changeset
239 debug(_('Capability hash generated: [%s]') % cap_hash)
e1842ebcb2f3 core, plugin XEP-0115: discovery refactoring:
Goffi <goffi@goffi.org>
parents: 941
diff changeset
240 return cap_hash
963
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
241
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
242 @defer.inlineCallbacks
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
243 def _discoInfos(self, entity_jid_s, profile_key=C.PROF_KEY_NONE):
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
244 """ Discovery method for the bridge
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
245 @param entity_jid_s: entity we want to discover
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
246
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
247 @return: list of tu"""
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
248 entity = jid.JID(entity_jid_s)
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
249 disco_infos = yield self.getInfos(entity, profile_key)
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
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parents: 961
diff changeset
250 defer.returnValue((disco_infos.features, [(cat, type_, name or '') for (cat, type_), name in disco_infos.identities.items()]))
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Goffi <goffi@goffi.org>
parents: 961
diff changeset
251
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
252 @defer.inlineCallbacks
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
253 def _discoItems(self, entity_jid_s, profile_key=C.PROF_KEY_NONE):
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
254 """ Discovery method for the bridge
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
255 @param entity_jid_s: entity we want to discover
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
256
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
257 @return: list of tu"""
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
258 entity = jid.JID(entity_jid_s)
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Goffi <goffi@goffi.org>
parents: 961
diff changeset
259 disco_items = yield self.getItems(entity, profile_key)
723f28cd15c7 core (disco): added discoInfos and discoItems bridge methods
Goffi <goffi@goffi.org>
parents: 961
diff changeset
260 defer.returnValue([(item.entity.full(), item.nodeIdentifier or '', item.name or '') for item in disco_items])