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annotate sat/tools/sat_defer.py @ 4033:5a42c7842556

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core (plugins): implementation of XEP-0215 "External Service Discovery": rel 418
author Goffi <goffi@goffi.org>
date Fri, 07 Apr 2023 15:16:39 +0200
parents 7550ae9cfbac
children 524856bd7b19
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1 #!/usr/bin/env python3
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2
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3
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4 # Libervia: an XMPP client
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5 # Copyright (C) 2009-2021 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
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20 """tools related to deferred"""
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21
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22 from sat.core.log import getLogger
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24 log = getLogger(__name__)
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25 from sat.core import exceptions
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26 from twisted.internet import defer
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27 from twisted.internet import error as internet_error
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28 from twisted.internet import reactor
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29 from twisted.words.protocols.jabber import error as jabber_error
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30 from twisted.python import failure
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31 from sat.core.constants import Const as C
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32 from sat.memory import memory
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33
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34 KEY_DEFERREDS = "deferreds"
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35 KEY_NEXT = "next_defer"
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37
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38 def stanza2NotFound(failure_):
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39 """Convert item-not-found StanzaError to exceptions.NotFound"""
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40 failure_.trap(jabber_error.StanzaError)
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41 if failure_.value.condition == 'item-not-found':
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42 raise exceptions.NotFound(failure_.value.text or failure_.value.condition)
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43 return failure_
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45
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46 class DelayedDeferred(object):
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47 """A Deferred-like which is launched after a delay"""
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49 def __init__(self, delay, result):
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50 """
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51 @param delay(float): delay before launching the callback, in seconds
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52 @param result: result used with the callback
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53 """
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54 self._deferred = defer.Deferred()
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55 self._timer = reactor.callLater(delay, self._deferred.callback, result)
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56
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57 def cancel(self):
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58 try:
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59 self._timer.cancel()
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60 except internet_error.AlreadyCalled:
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61 pass
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62 self._deferred.cancel()
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64 def addCallbacks(self, *args, **kwargs):
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65 self._deferred.addCallbacks(*args, **kwargs)
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67 def addCallback(self, *args, **kwargs):
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68 self._deferred.addCallback(*args, **kwargs)
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70 def addErrback(self, *args, **kwargs):
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71 self._deferred.addErrback(*args, **kwargs)
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72
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73 def addBoth(self, *args, **kwargs):
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74 self._deferred.addBoth(*args, **kwargs)
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75
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76 def chainDeferred(self, *args, **kwargs):
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77 self._deferred.chainDeferred(*args, **kwargs)
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78
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79 def pause(self):
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80 self._deferred.pause()
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81
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82 def unpause(self):
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83 self._deferred.unpause()
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84
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85
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86 class RTDeferredSessions(memory.Sessions):
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87 """Real Time Deferred Sessions"""
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88
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89 def __init__(self, timeout=120):
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90 """Manage list of Deferreds in real-time, allowing to get intermediate results
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91
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92 @param timeout (int): nb of seconds before deferreds cancellation
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93 """
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94 super(RTDeferredSessions, self).__init__(
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95 timeout=timeout, resettable_timeout=False
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96 )
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97
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98 def newSession(self, deferreds, profile):
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99 """Launch a new session with a list of deferreds
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100
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101 @param deferreds(list[defer.Deferred]): list of deferred to call
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102 @param profile: %(doc_profile)s
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103 @param return (tupe[str, defer.Deferred]): tuple with session id and a deferred wich fire *WITHOUT RESULT* when all results are received
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104 """
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105 data = {KEY_NEXT: defer.Deferred()}
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106 session_id, session_data = super(RTDeferredSessions, self).newSession(
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107 data, profile=profile
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108 )
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109 if isinstance(deferreds, dict):
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110 session_data[KEY_DEFERREDS] = list(deferreds.values())
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111 iterator = iter(deferreds.items())
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112 else:
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113 session_data[KEY_DEFERREDS] = deferreds
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114 iterator = enumerate(deferreds)
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115
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116 for idx, d in iterator:
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117 d._RTDeferred_index = idx
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118 d._RTDeferred_return = None
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119 d.addCallback(self._callback, d, session_id, profile)
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120 d.addErrback(self._errback, d, session_id, profile)
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121 return session_id
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122
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123 def _purgeSession(
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124 self, session_id, reason="timeout", no_warning=False, got_result=False
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125 ):
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126 """Purge the session
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127
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128 @param session_id(str): id of the session to purge
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129 @param reason (unicode): human readable reason why the session is purged
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130 @param no_warning(bool): if True, no warning will be put in logs
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131 @param got_result(bool): True if the session is purged after normal ending (i.e.: all the results have been gotten).
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132 reason and no_warning are ignored if got_result is True.
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133 @raise KeyError: session doesn't exists (anymore ?)
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134 """
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135 if not got_result:
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136 try:
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137 timer, session_data, profile = self._sessions[session_id]
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138 except ValueError:
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139 raise exceptions.InternalError(
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140 "was expecting timer, session_data and profile; is profile set ?"
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141 )
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142
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143 # next_defer must be called before deferreds,
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144 # else its callback will be called by _gotResult
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145 next_defer = session_data[KEY_NEXT]
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146 if not next_defer.called:
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147 next_defer.errback(failure.Failure(defer.CancelledError(reason)))
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148
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149 deferreds = session_data[KEY_DEFERREDS]
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150 for d in deferreds:
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151 d.cancel()
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152
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153 if not no_warning:
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154 log.warning(
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155 "RTDeferredList cancelled: {} (profile {})".format(reason, profile)
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156 )
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157
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158 super(RTDeferredSessions, self)._purgeSession(session_id)
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159
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160 def _gotResult(self, session_id, profile):
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161 """Method called after each callback or errback
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162
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163 manage the next_defer deferred
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164 """
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165 session_data = self.profileGet(session_id, profile)
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166 defer_next = session_data[KEY_NEXT]
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167 if not defer_next.called:
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168 defer_next.callback(None)
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169
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170 def _callback(self, result, deferred, session_id, profile):
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171 deferred._RTDeferred_return = (True, result)
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172 self._gotResult(session_id, profile)
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173
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174 def _errback(self, failure, deferred, session_id, profile):
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175 deferred._RTDeferred_return = (False, failure)
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176 self._gotResult(session_id, profile)
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177
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178 def cancel(self, session_id, reason="timeout", no_log=False):
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179 """Stop this RTDeferredList
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180
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181 Cancel all remaining deferred, and call self.final_defer.errback
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182 @param reason (unicode): reason of the cancellation
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183 @param no_log(bool): if True, don't log the cancellation
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184 """
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185 self._purgeSession(session_id, reason=reason, no_warning=no_log)
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186
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187 def getResults(
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188 self, session_id, on_success=None, on_error=None, profile=C.PROF_KEY_NONE
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189 ):
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190 """Get current results of a real-time deferred session
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191
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192 result already gotten are deleted
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193 @param session_id(str): session id
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194 @param on_success: can be:
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195 - None: add success normaly to results
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196 - callable: replace result by the return value of on_success(result) (may be deferred)
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197 @param on_error: can be:
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198 - None: add error normaly to results
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199 - C.IGNORE: don't put errors in results
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200 - callable: replace failure by the return value of on_error(failure) (may be deferred)
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201 @param profile=%(doc_profile)s
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202 @param result(tuple): tuple(remaining, results) where:
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203 - remaining[int] is the number of remaining deferred
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204 (deferreds from which we don't have result yet)
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205 - results is a dict where:
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206 - key is the index of the deferred if deferred is a list, or its key if it's a dict
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207 - value = (success, result) where:
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208 - success is True if the deferred was successful
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209 - result is the result in case of success, else the failure
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210 If remaining == 0, the session is ended
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211 @raise KeyError: the session is already finished or doesn't exists at all
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212 """
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213 if profile == C.PROF_KEY_NONE:
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214 raise exceptions.ProfileNotSetError
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215 session_data = self.profileGet(session_id, profile)
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216
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217 @defer.inlineCallbacks
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218 def next_cb(__):
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219 # we got one or several results
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220 results = {}
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221 filtered_data = [] # used to keep deferreds without results
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222 deferreds = session_data[KEY_DEFERREDS]
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223
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224 for d in deferreds:
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225 if (
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226 d._RTDeferred_return
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227 ): # we don't use d.called as called is True before the full callbacks chain has been called
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228 # we have a result
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229 idx = d._RTDeferred_index
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230 success, result = d._RTDeferred_return
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231 if success:
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232 if on_success is not None:
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233 if callable(on_success):
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234 result = yield on_success(result)
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235 else:
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236 raise exceptions.InternalError(
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237 "Unknown value of on_success: {}".format(on_success)
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238 )
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239
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240 else:
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241 if on_error is not None:
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242 if on_error == C.IGNORE:
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243 continue
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244 elif callable(on_error):
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245 result = yield on_error(result)
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246 else:
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247 raise exceptions.InternalError(
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248 "Unknown value of on_error: {}".format(on_error)
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249 )
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250 results[idx] = (success, result)
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251 else:
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252 filtered_data.append(d)
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253
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254 # we change the deferred with the filtered list
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255 # in other terms, we don't want anymore deferred from which we have got the result
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256 session_data[KEY_DEFERREDS] = filtered_data
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257
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258 if filtered_data:
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259 # we create a new next_defer only if we are still waiting for results
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260 session_data[KEY_NEXT] = defer.Deferred()
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261 else:
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262 # no more data to get, the result have been gotten,
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263 # we can cleanly finish the session
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264 self._purgeSession(session_id, got_result=True)
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265
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266 defer.returnValue((len(filtered_data), results))
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267
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268 # we wait for a result
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269 return session_data[KEY_NEXT].addCallback(next_cb)