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annotate libervia/web/server/session_iface.py @ 1518:eb00d593801d

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refactoring: rename `libervia` to `libervia.web` + update imports following backend changes
author Goffi <goffi@goffi.org>
date Fri, 02 Jun 2023 16:49:28 +0200
parents libervia/server/session_iface.py@106bae41f5c8
children 7941444c1671
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 collections import OrderedDict, deque
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19 import os.path
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20 import time
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21 from typing import List, Dict, Optional
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22
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23 import shortuuid
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24 from zope.interface import Attribute, Interface
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25 from zope.interface import implementer
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26
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27 from libervia.backend.core.log import getLogger
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29 from libervia.web.server.classes import Notification
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30 from libervia.web.server.constants import Const as C
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31
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32
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33 log = getLogger(__name__)
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34
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35 FLAGS_KEY = "_flags"
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36 NOTIFICATIONS_KEY = "_notifications"
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37 MAX_CACHE_AFFILIATIONS = 100 # number of nodes to keep in cache
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38
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39
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40 class IWebSession(Interface):
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41 profile = Attribute("Sat profile")
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42 jid = Attribute("JID associated with the profile")
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43 uuid = Attribute("uuid associated with the profile session")
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44 identities = Attribute("Identities of XMPP entities")
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45
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46
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47 @implementer(IWebSession)
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48 class WebSession:
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49 profiles_map: Dict[Optional[str], List["WebSession"]] = {}
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50
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51 def __init__(self, session):
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52 self._profile = None
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53 self.jid = None
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54 self.started = time.time()
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55 # time when the backend session was started
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56 self.backend_started = None
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57 self.uuid = str(shortuuid.uuid())
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58 self.identities = {}
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59 self.csrf_token = str(shortuuid.uuid())
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60 self.ws_token = str(shortuuid.uuid())
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61 self.ws_socket = None
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62 self.ws_buffer = deque(maxlen=200)
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63 self.locale = None # i18n of the pages
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64 self.theme = None
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65 self.pages_data = {} # used to keep data accross reloads (key is page instance)
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66 self.affiliations = OrderedDict() # cache for node affiliations
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67 self.profiles_map.setdefault(C.SERVICE_PROFILE, []).append(self)
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68 log.debug(
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69 f"session started for {C.SERVICE_PROFILE} "
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70 f"({len(self.get_profile_sessions(C.SERVICE_PROFILE))} session(s) active)"
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71 )
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72
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73 @property
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74 def profile(self) -> Optional[str]:
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75 return self._profile
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76
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77 @profile.setter
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78 def profile(self, profile: Optional[str]) -> None:
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79 old_profile = self._profile or C.SERVICE_PROFILE
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80 new_profile = profile or C.SERVICE_PROFILE
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81 try:
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82 self.profiles_map[old_profile].remove(self)
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83 except (ValueError, KeyError):
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84 log.warning(f"session was not registered for profile {old_profile}")
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85 else:
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86 nb_session_old = len(self.get_profile_sessions(old_profile))
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87 log.debug(f"{old_profile} has now {nb_session_old} session(s) active")
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88
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89 self._profile = profile
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90 self.profiles_map.setdefault(new_profile, []).append(self)
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91 nb_session_new = len(self.get_profile_sessions(new_profile))
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92 log.debug(f"{new_profile} has now {nb_session_new} session(s) active")
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93
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94 @property
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95 def cache_dir(self):
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96 if self.profile is None:
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97 return self.service_cache_url + "/"
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98 return os.path.join("/", C.CACHE_DIR, self.uuid) + "/"
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99
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100 @property
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101 def connected(self):
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102 return self.profile is not None
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103
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104 @property
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105 def guest(self):
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106 """True if this is a guest session"""
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107 if self.profile is None:
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108 return False
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109 else:
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110 return self.profile.startswith("guest@@")
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111
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112 @classmethod
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113 def send(cls, profile: str, data_type: str, data: dict) -> None:
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114 """Send a message to all session
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115
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116 If the session doesn't have an active websocket, the message is buffered until a
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117 socket is available
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118 """
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119 for session in cls.profiles_map.get(profile, []):
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120 if session.ws_socket is None or not session.ws_socket.init_ok:
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121 session.ws_buffer.append({"data_type": data_type, "data": data})
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122 else:
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123 session.ws_socket.send(data_type, data)
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124
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125 def on_expire(self) -> None:
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126 profile = self._profile or C.SERVICE_PROFILE
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127 try:
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128 self.profiles_map[profile].remove(self)
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129 except (ValueError, KeyError):
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130 log.warning(f"session was not registered for profile {profile}")
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131 else:
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132 nb_session = len(self.get_profile_sessions(profile))
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133 log.debug(
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134 f"Session for profile {profile} expired. {profile} has now {nb_session} "
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135 f"session(s) active."
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136 )
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137
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138 @classmethod
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139 def get_profile_sessions(cls, profile: str) -> List["WebSession"]:
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140 return cls.profiles_map.get(profile, [])
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141
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142 def get_page_data(self, page, key):
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143 """get session data for a page
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144
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145 @param page(LiberviaPage): instance of the page
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146 @param key(object): data key
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147 return (None, object): value of the key
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148 None if not found or page_data doesn't exist
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149 """
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150 return self.pages_data.get(page, {}).get(key)
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151
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152 def pop_page_data(self, page, key, default=None):
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153 """like get_page_data, but remove key once value is gotten
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154
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155 @param page(LiberviaPage): instance of the page
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156 @param key(object): data key
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157 @param default(object): value to return if key is not found
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158 @return (object): found value or default
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159 """
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160 page_data = self.pages_data.get(page)
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161 if page_data is None:
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162 return default
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163 value = page_data.pop(key, default)
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164 if not page_data:
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165 # no need to keep unused page_data
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166 del self.pages_data[page]
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167 return value
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168
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169 def set_page_data(self, page, key, value):
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170 """set data to persist on reload
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171
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172 @param page(LiberviaPage): instance of the page
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173 @param key(object): data key
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174 @param value(object): value to set
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175 @return (object): set value
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176 """
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177 page_data = self.pages_data.setdefault(page, {})
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178 page_data[key] = value
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179 return value
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180
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181 def set_page_flag(self, page, flag):
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182 """set a flag for this page
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183
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184 @param page(LiberviaPage): instance of the page
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185 @param flag(unicode): flag to set
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186 """
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187 flags = self.get_page_data(page, FLAGS_KEY)
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188 if flags is None:
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189 flags = self.set_page_data(page, FLAGS_KEY, set())
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190 flags.add(flag)
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191
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192 def pop_page_flag(self, page, flag):
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193 """return True if flag is set
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194
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195 flag is removed if it was set
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196 @param page(LiberviaPage): instance of the page
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197 @param flag(unicode): flag to set
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198 @return (bool): True if flaag was set
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199 """
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200 page_data = self.pages_data.get(page, {})
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201 flags = page_data.get(FLAGS_KEY)
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202 if flags is None:
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203 return False
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204 if flag in flags:
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205 flags.remove(flag)
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206 # we remove data if they are not used anymore
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207 if not flags:
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208 del page_data[FLAGS_KEY]
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209 if not page_data:
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210 del self.pages_data[page]
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211 return True
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212 else:
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213 return False
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214
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215 def set_page_notification(self, page, message, level=C.LVL_INFO):
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216 """set a flag for this page
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217
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218 @param page(LiberviaPage): instance of the page
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219 @param flag(unicode): flag to set
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220 """
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221 notif = Notification(message, level)
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222 notifs = self.get_page_data(page, NOTIFICATIONS_KEY)
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223 if notifs is None:
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224 notifs = self.set_page_data(page, NOTIFICATIONS_KEY, [])
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225 notifs.append(notif)
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226
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227 def pop_page_notifications(self, page):
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228 """Return and remove last page notification
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229
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230 @param page(LiberviaPage): instance of the page
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231 @return (list[Notification]): notifications if any
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232 """
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233 page_data = self.pages_data.get(page, {})
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234 notifs = page_data.get(NOTIFICATIONS_KEY)
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235 if not notifs:
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236 return []
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237 ret = notifs[:]
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238 del notifs[:]
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239 return ret
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240
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241 def get_affiliation(self, service, node):
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242 """retrieve affiliation for a pubsub node
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243
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244 @param service(jid.JID): pubsub service
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245 @param node(unicode): pubsub node
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246 @return (unicode, None): affiliation, or None if it is not in cache
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247 """
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248 if service.resource:
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249 raise ValueError("Service must not have a resource")
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250 if not node:
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251 raise ValueError("node must be set")
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252 try:
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253 affiliation = self.affiliations.pop((service, node))
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254 except KeyError:
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255 return None
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256 else:
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257 # we replace at the top to get the most recently used on top
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258 # so less recently used will be removed if cache is full
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259 self.affiliations[(service, node)] = affiliation
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260 return affiliation
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261
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262 def set_affiliation(self, service, node, affiliation):
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263 """cache affiliation for a node
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264
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265 will empty cache when it become too big
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266 @param service(jid.JID): pubsub service
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267 @param node(unicode): pubsub node
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268 @param affiliation(unicode): affiliation to this node
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269 """
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270 if service.resource:
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271 raise ValueError("Service must not have a resource")
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272 if not node:
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273 raise ValueError("node must be set")
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274 self.affiliations[(service, node)] = affiliation
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275 while len(self.affiliations) > MAX_CACHE_AFFILIATIONS:
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276 self.affiliations.popitem(last=False)
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277
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278
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279 class IWebGuestSession(Interface):
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280 id = Attribute("UUID of the guest")
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281 data = Attribute("data associated with the guest")
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282
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283
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284 @implementer(IWebGuestSession)
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285 class WebGuestSession(object):
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286
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287 def __init__(self, session):
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288 self.id = None
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289 self.data = None