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annotate libervia/server/session_iface.py @ 1490:774a81a6e8b5

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pages: new `useCache` method to check if `no-cache` is used in request
author Goffi <goffi@goffi.org>
date Wed, 26 Jan 2022 10:23:07 +0100
parents 822bd0139769
children 409d10211b20
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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 # Libervia: a SàT frontend
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4 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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5
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6 # This program is free software: you can redistribute it and/or modify
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7 # it under the terms of the GNU Affero General Public License as published by
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8 # the Free Software Foundation, either version 3 of the License, or
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9 # (at your option) any later version.
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10
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11 # This program is distributed in the hope that it will be useful,
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 # GNU Affero General Public License for more details.
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15
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16 # You should have received a copy of the GNU Affero General Public License
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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18 from zope.interface import Interface, Attribute
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19 from zope.interface import implementer
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20 from libervia.server.constants import Const as C
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21 from libervia.server.classes import Notification
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22 from collections import OrderedDict
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23 import os.path
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24 import shortuuid
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25 import time
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26
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27 FLAGS_KEY = "_flags"
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28 NOTIFICATIONS_KEY = "_notifications"
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29 MAX_CACHE_AFFILIATIONS = 100 # number of nodes to keep in cache
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31
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32 class ISATSession(Interface):
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33 profile = Attribute("Sat profile")
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34 jid = Attribute("JID associated with the profile")
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35 uuid = Attribute("uuid associated with the profile session")
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36 identities = Attribute("Identities of XMPP entities")
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38
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39 @implementer(ISATSession)
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40 class SATSession(object):
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41
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42 def __init__(self, session):
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43 self.profile = None
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44 self.jid = None
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45 self.started = time.time()
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46 # time when the backend session was started
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47 self.backend_started = None
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48 self.uuid = str(shortuuid.uuid())
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49 self.identities = {}
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50 self.csrf_token = str(shortuuid.uuid())
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51 self.locale = None # i18n of the pages
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52 self.theme = None
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53 self.pages_data = {} # used to keep data accross reloads (key is page instance)
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54 self.affiliations = OrderedDict() # cache for node affiliations
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55
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56 @property
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57 def cache_dir(self):
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58 if self.profile is None:
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59 return self.service_cache_url + "/"
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60 return os.path.join("/", C.CACHE_DIR, self.uuid) + "/"
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61
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62 @property
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63 def connected(self):
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64 return self.profile is not None
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65
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66 @property
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67 def guest(self):
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68 """True if this is a guest session"""
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69 if self.profile is None:
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70 return False
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71 else:
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72 return self.profile.startswith("guest@@")
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73
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74 def getPageData(self, page, key):
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75 """get session data for a page
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76
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77 @param page(LiberviaPage): instance of the page
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78 @param key(object): data key
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79 return (None, object): value of the key
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80 None if not found or page_data doesn't exist
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81 """
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82 return self.pages_data.get(page, {}).get(key)
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83
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84 def popPageData(self, page, key, default=None):
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85 """like getPageData, but remove key once value is gotten
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86
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87 @param page(LiberviaPage): instance of the page
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88 @param key(object): data key
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89 @param default(object): value to return if key is not found
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90 @return (object): found value or default
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91 """
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92 page_data = self.pages_data.get(page)
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93 if page_data is None:
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94 return default
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95 value = page_data.pop(key, default)
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96 if not page_data:
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97 # no need to keep unused page_data
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98 del self.pages_data[page]
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99 return value
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100
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101 def setPageData(self, page, key, value):
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102 """set data to persist on reload
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103
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104 @param page(LiberviaPage): instance of the page
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105 @param key(object): data key
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106 @param value(object): value to set
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107 @return (object): set value
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108 """
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109 page_data = self.pages_data.setdefault(page, {})
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110 page_data[key] = value
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111 return value
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112
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113 def setPageFlag(self, page, flag):
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114 """set a flag for this page
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115
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116 @param page(LiberviaPage): instance of the page
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117 @param flag(unicode): flag to set
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118 """
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119 flags = self.getPageData(page, FLAGS_KEY)
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120 if flags is None:
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121 flags = self.setPageData(page, FLAGS_KEY, set())
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122 flags.add(flag)
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123
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124 def popPageFlag(self, page, flag):
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125 """return True if flag is set
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126
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127 flag is removed if it was set
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128 @param page(LiberviaPage): instance of the page
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129 @param flag(unicode): flag to set
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130 @return (bool): True if flaag was set
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131 """
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132 page_data = self.pages_data.get(page, {})
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133 flags = page_data.get(FLAGS_KEY)
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134 if flags is None:
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135 return False
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136 if flag in flags:
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137 flags.remove(flag)
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138 # we remove data if they are not used anymore
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139 if not flags:
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140 del page_data[FLAGS_KEY]
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141 if not page_data:
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142 del self.pages_data[page]
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143 return True
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144 else:
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145 return False
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146
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147 def setPageNotification(self, page, message, level=C.LVL_INFO):
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148 """set a flag for this page
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149
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150 @param page(LiberviaPage): instance of the page
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151 @param flag(unicode): flag to set
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152 """
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153 notif = Notification(message, level)
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154 notifs = self.getPageData(page, NOTIFICATIONS_KEY)
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155 if notifs is None:
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156 notifs = self.setPageData(page, NOTIFICATIONS_KEY, [])
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157 notifs.append(notif)
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158
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159 def popPageNotifications(self, page):
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160 """Return and remove last page notification
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161
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162 @param page(LiberviaPage): instance of the page
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163 @return (list[Notification]): notifications if any
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164 """
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165 page_data = self.pages_data.get(page, {})
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166 notifs = page_data.get(NOTIFICATIONS_KEY)
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167 if not notifs:
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168 return []
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169 ret = notifs[:]
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170 del notifs[:]
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171 return ret
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172
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173 def getAffiliation(self, service, node):
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174 """retrieve affiliation for a pubsub node
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175
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176 @param service(jid.JID): pubsub service
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177 @param node(unicode): pubsub node
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178 @return (unicode, None): affiliation, or None if it is not in cache
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179 """
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180 if service.resource:
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181 raise ValueError("Service must not have a resource")
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182 if not node:
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183 raise ValueError("node must be set")
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184 try:
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185 affiliation = self.affiliations.pop((service, node))
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186 except KeyError:
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187 return None
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188 else:
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189 # we replace at the top to get the most recently used on top
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190 # so less recently used will be removed if cache is full
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191 self.affiliations[(service, node)] = affiliation
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192 return affiliation
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193
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194 def setAffiliation(self, service, node, affiliation):
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195 """cache affiliation for a node
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196
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197 will empty cache when it become too big
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198 @param service(jid.JID): pubsub service
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199 @param node(unicode): pubsub node
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200 @param affiliation(unicode): affiliation to this node
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201 """
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diff changeset
202 if service.resource:
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203 raise ValueError("Service must not have a resource")
1093
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diff changeset
204 if not node:
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205 raise ValueError("node must be set")
1093
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diff changeset
206 self.affiliations[(service, node)] = affiliation
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diff changeset
207 while len(self.affiliations) > MAX_CACHE_AFFILIATIONS:
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diff changeset
208 self.affiliations.popitem(last=False)
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diff changeset
209
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parents:
diff changeset
210
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Goffi <goffi@goffi.org>
parents:
diff changeset
211 class ISATGuestSession(Interface):
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Goffi <goffi@goffi.org>
parents:
diff changeset
212 id = Attribute("UUID of the guest")
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Goffi <goffi@goffi.org>
parents:
diff changeset
213 data = Attribute("data associated with the guest")
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Goffi <goffi@goffi.org>
parents:
diff changeset
214
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Goffi <goffi@goffi.org>
parents:
diff changeset
215
1216
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diff changeset
216 @implementer(ISATGuestSession)
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parents:
diff changeset
217 class SATGuestSession(object):
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Goffi <goffi@goffi.org>
parents:
diff changeset
218
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Goffi <goffi@goffi.org>
parents:
diff changeset
219 def __init__(self, session):
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Goffi <goffi@goffi.org>
parents:
diff changeset
220 self.id = None
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Goffi <goffi@goffi.org>
parents:
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221 self.data = None