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annotate src/server/session_iface.py @ 1093:eda7a1c6532a

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server: new getAffiliation method: getAffiliation allows to retrieve affiliation to a pubsub node for logged user. The method handle cache in user's session, avoiding requesting pubsub service when possible.
author Goffi <goffi@goffi.org>
date Fri, 01 Jun 2018 13:03:52 +0200
parents 9c41b7e91172
children 8a270f32de81
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 # Libervia: a SAT frontend
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5 # Copyright (C) 2009-2018 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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11
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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 from zope.interface import Interface, Attribute, implements
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20 from sat.tools.common import data_objects
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21 from libervia.server.constants import Const as C
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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 MAX_CACHE_AFFILIATIONS = 100 # number of nodes to keep in cache
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29
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30 class ISATSession(Interface):
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31 profile = Attribute("Sat profile")
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32 jid = Attribute("JID associated with the profile")
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33 uuid = Attribute("uuid associated with the profile session")
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34 identities = Attribute("Identities of XMPP entities")
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35
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36
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37 class SATSession(object):
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38 implements(ISATSession)
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39
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40 def __init__(self, session):
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41 self.profile = None
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42 self.jid = None
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43 self.started = time.time()
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44 # time when the backend session was started
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45 self.backend_started = None
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46 self.uuid = unicode(shortuuid.uuid())
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47 self.identities = data_objects.Identities()
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48 self.csrf_token = unicode(shortuuid.uuid())
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49 self.pages_data = {} # used to keep data accross reloads (key is page instance)
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50 self.affiliations = OrderedDict() # cache for node affiliations
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51
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52 @property
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53 def cache_dir(self):
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54 if self.profile is None:
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55 return self.service_cache_url + u'/'
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56 return os.path.join(u'/', C.CACHE_DIR, self.uuid) + u'/'
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57
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58 def getPageData(self, page, key):
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59 """get session data for a page
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60
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61 @param page(LiberviaPage): instance of the page
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62 @param key(object): data key
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63 return (None, object): value of the key
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64 None if not found or page_data doesn't exist
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65 """
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66 return self.pages_data.get(page, {}).get(key)
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67
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68 def popPageData(self, page, key, default=None):
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69 """like getPageData, but remove key once value is gotten
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70
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71 @param page(LiberviaPage): instance of the page
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72 @param key(object): data key
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73 @param default(object): value to return if key is not found
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74 @return (object): found value or default
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75 """
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76 page_data = self.pages_data.get(page)
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77 if page_data is None:
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78 return default
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79 value = page_data.pop(key, default)
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80 if not page_data:
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81 # no need to keep unused page_data
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82 del self.pages_data[page]
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83 return value
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84
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85 def setPageData(self, page, key, value):
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86 """set data to persist on reload
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87
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88 @param page(LiberviaPage): instance of the page
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89 @param key(object): data key
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90 @param value(object): value to set
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91 @return (object): set value
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92 """
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93 page_data = self.pages_data.setdefault(page, {})
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94 page_data[key] = value
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95 return value
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96
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97 def setPageFlag(self, page, flag):
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98 """set a flag for this page
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99
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100 @param page(LiberviaPage): instance of the page
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101 @param flag(unicode): flag to set
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102 """
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103 flags = self.getPageData(page, FLAGS_KEY)
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104 if flags is None:
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105 flags = self.setPageData(page, FLAGS_KEY, set())
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106 flags.add(flag)
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107
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108 def popPageFlag(self, page, flag):
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109 """return True if flag is set
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110
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111 flag is removed if it was set
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112 @param page(LiberviaPage): instance of the page
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113 @param flag(unicode): flag to set
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114 @return (bool): True if flaag was set
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115 """
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116 page_data = self.pages_data.get(page, {})
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117 flags = page_data.get(FLAGS_KEY)
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118 if flags is None:
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119 return False
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120 if flag in flags:
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121 flags.remove(flag)
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122 # we remove data if they are not used anymore
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123 if not flags:
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124 del page_data[FLAGS_KEY]
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125 if not page_data:
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126 del self.pages_data[page]
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127 return True
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128 else:
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129 return False
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130
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131 def getAffiliation(self, service, node):
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132 """retrieve affiliation for a pubsub node
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133
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134 @param service(jid.JID): pubsub service
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135 @param node(unicode): pubsub node
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136 @return (unicode, None): affiliation, or None if it is not in cache
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137 """
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138 if service.resource:
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139 raise ValueError(u"Service must not have a resource")
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140 if not node:
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141 raise ValueError(u"node must be set")
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142 try:
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143 affiliation = self.affiliations.pop((service, node))
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144 except KeyError:
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145 return None
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146 else:
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147 # we replace at the top to get the most recently used on top
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148 # so less recently used will be removed if cache is full
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149 self.affiliations[(service, node)] = affiliation
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150 return affiliation
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151
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152 def setAffiliation(self, service, node, affiliation):
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153 """cache affiliation for a node
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154
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155 will empty cache when it become too big
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156 @param service(jid.JID): pubsub service
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157 @param node(unicode): pubsub node
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158 @param affiliation(unicode): affiliation to this node
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159 """
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160 if service.resource:
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161 raise ValueError(u"Service must not have a resource")
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162 if not node:
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163 raise ValueError(u"node must be set")
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164 self.affiliations[(service, node)] = affiliation
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165 while len(self.affiliations) > MAX_CACHE_AFFILIATIONS:
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166 self.affiliations.popitem(last=False)
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167
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168
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169 class ISATGuestSession(Interface):
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170 id = Attribute("UUID of the guest")
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171 data = Attribute("data associated with the guest")
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172
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173
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174 class SATGuestSession(object):
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175 implements(ISATGuestSession)
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176
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177 def __init__(self, session):
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178 self.id = None
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179 self.data = None