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annotate sat/bridge/bridge_constructor/constructors/pb/pb_core_template.py @ 3039:a1bc34f90fa5

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bridge (pb): implemented an asyncio compatible bridge: `pb` bridge can now be used with asyncio by instantiating AIOBridge.
author Goffi <goffi@goffi.org>
date Wed, 25 Sep 2019 08:53:38 +0200
parents ab2696e34d29
children 9d0df638c8b4
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 # -*- coding: utf-8 -*-
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3
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4 # SAT: a jabber client
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5 # Copyright (C) 2009-2019 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
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21 import dataclasses
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22 from sat.core.log import getLogger
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23 from twisted.spread import jelly, pb
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24 from twisted.internet import reactor
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25
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26 log = getLogger(__name__)
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27
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29 ## jelly hack
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30 # we monkey patch jelly to handle namedtuple
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31 ori_jelly = jelly._Jellier.jelly
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32
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33
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34 def fixed_jelly(self, obj):
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35 """this method fix handling of namedtuple"""
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36 if isinstance(obj, tuple) and not obj is tuple:
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37 obj = tuple(obj)
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38 return ori_jelly(self, obj)
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39
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40
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41 jelly._Jellier.jelly = fixed_jelly
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42
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43
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44 @dataclasses.dataclass(eq=False)
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45 class HandlerWrapper:
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46 # we use a wrapper to keep signals handlers because RemoteReference doesn't support
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47 # comparison (other than equality), making it unusable with a list
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48 handler: pb.RemoteReference
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49
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50
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51 class PBRoot(pb.Root):
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52 def __init__(self):
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53 self.signals_handlers = []
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54
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55 def remote_initBridge(self, signals_handler):
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56 self.signals_handlers.append(HandlerWrapper(signals_handler))
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57 log.info("registered signal handler")
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58
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59 def sendSignalEb(self, failure_, signal_name):
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60 if not failure_.check(pb.PBConnectionLost):
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61 log.error(
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62 f"Error while sending signal {signal_name}: {failure_}",
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63 )
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64
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65 def sendSignal(self, name, args, kwargs):
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66 to_remove = []
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67 for wrapper in self.signals_handlers:
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68 handler = wrapper.handler
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69 try:
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70 d = handler.callRemote(name, *args, **kwargs)
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71 except pb.DeadReferenceError:
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72 to_remove.append(wrapper)
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73 else:
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74 d.addErrback(self.sendSignalEb, name)
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75 if to_remove:
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76 for wrapper in to_remove:
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77 log.debug("Removing signal handler for dead frontend")
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78 self.signals_handlers.remove(wrapper)
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79
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80 def _bridgeDeactivateSignals(self):
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81 if hasattr(self, "signals_paused"):
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82 log.warning("bridge signals already deactivated")
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83 if self.signals_handler:
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84 self.signals_paused.extend(self.signals_handler)
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85 else:
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86 self.signals_paused = self.signals_handlers
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87 self.signals_handlers = []
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88 log.debug("bridge signals have been deactivated")
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89
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90 def _bridgeReactivateSignals(self):
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91 try:
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92 self.signals_handlers = self.signals_paused
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93 except AttributeError:
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94 log.debug("signals were already activated")
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95 else:
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96 del self.signals_paused
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97 log.debug("bridge signals have been reactivated")
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98
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99 ##METHODS_PART##
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100
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101
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102 class Bridge(object):
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103 def __init__(self):
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104 log.info("Init Perspective Broker...")
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105 self.root = PBRoot()
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106 reactor.listenTCP(8789, pb.PBServerFactory(self.root))
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107
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108 def sendSignal(self, name, *args, **kwargs):
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109 self.root.sendSignal(name, args, kwargs)
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110
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111 def remote_initBridge(self, signals_handler):
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112 self.signals_handlers.append(signals_handler)
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113 log.info("registered signal handler")
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114
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115 def register_method(self, name, callback):
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116 log.debug("registering PB bridge method [%s]" % name)
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117 setattr(self.root, "remote_" + name, callback)
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118 #  self.root.register_method(name, callback)
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119
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120 def addMethod(self, name, int_suffix, in_sign, out_sign, method, async_=False, doc={}):
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121 """Dynamically add a method to PB Bridge"""
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122 # FIXME: doc parameter is kept only temporary, the time to remove it from calls
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123 log.debug("Adding method {name} to PB bridge".format(name=name))
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124 self.register_method(name, method)
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125
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126 def addSignal(self, name, int_suffix, signature, doc={}):
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127 log.debug("Adding signal {name} to PB bridge".format(name=name))
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128 setattr(
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129 self, name, lambda *args, **kwargs: self.sendSignal(name, *args, **kwargs)
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130 )
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131
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132 def bridgeDeactivateSignals(self):
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133 """Stop sending signals to bridge
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134
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135 Mainly used for mobile frontends, when the frontend is paused
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136 """
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137 self.root._bridgeDeactivateSignals()
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138
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139 def bridgeReactivateSignals(self):
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140 """Send again signals to bridge
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141
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142 Should only be used after bridgeDeactivateSignals has been called
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143 """
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144 self.root._bridgeReactivateSignals()
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145
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146 ##SIGNALS_PART##