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annotate src/bridge/bridge_constructor/constructors/pb/pb_frontend_template.py @ 2444:30278ea1ca7c

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plugin XEP-0060: added node watching methods to bridge: new methods psNodeWatchAdd and psNodeWatchRemove allows to set a watch for the time of the session on one node, to have a signal called when something change on this node. This signal (psEventRaw) send raw data (raw XML), in opposition to psEvent which is there to send high level data (e.g. parsed blog data). Those method are primarely there to let frontends manage local cache for pubsub nodes.
author Goffi <goffi@goffi.org>
date Sun, 19 Nov 2017 16:51:39 +0100
parents 8b37a62336c3
children 0046283a285d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2092
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1 #!/usr/bin/env python2
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2 #-*- coding: utf-8 -*-
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3
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4 # SAT communication bridge
2414
8b37a62336c3 misc: date update (yes it's a bit late :p )
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5 # Copyright (C) 2009-2017 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 from sat.core.log import getLogger
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21 log = getLogger(__name__)
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22 from sat.core import exceptions
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23 from twisted.spread import pb
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24 from twisted.internet import reactor
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25
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26
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27 class SignalsHandler(pb.Referenceable):
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28
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29 def __getattr__(self, name):
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30 if name.startswith("remote_"):
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31 log.debug(u"calling an unregistered signal: {name}".format(
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32 name = name[7:]))
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33 return lambda *args, **kwargs: None
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34
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35 else:
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36 raise AttributeError(name)
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37
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38 def register_signal(self, name, handler, iface="core"):
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39 log.debug("registering signal {name}".format(name=name))
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40 method_name = "remote_" + name
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41 try:
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42 self.__getattribute__(self, method_name)
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43 except AttributeError:
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44 pass
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45 else:
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46 raise exceptions.InternalError(u"{name} signal handler has been registered twice".format(
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47 name = method_name))
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48 setattr(self, method_name, handler)
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49
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50
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51 class Bridge(object):
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52
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53 def __init__(self):
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54 self.signals_handler = SignalsHandler()
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55
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56 def __getattr__(self, name):
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57 return lambda *args, **kwargs: self.call(name, args, kwargs)
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58
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59 def remoteCallback(self, result, callback):
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60 """call callback with argument or None
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61
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62 if result is not None not argument is used,
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63 else result is used as argument
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64 @param result: remote call result
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65 @param callback(callable): method to call on result
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66 """
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67 if result is None:
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68 callback()
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69 else:
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70 callback(result)
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71
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72 def call(self, name, args, kwargs):
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73 """call a remote method
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74
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75 @param name(str): name of the bridge method
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76 @param args(list): arguments
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77 may contain callback and errback as last 2 items
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78 @param kwargs(dict): keyword arguments
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79 may contain callback and errback
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80 """
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81 callback = errback = None
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82 if kwargs:
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83 try:
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84 callback = kwargs.pop('callback')
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85 except KeyError:
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86 pass
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87 try:
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88 errback = kwargs.pop('errback')
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89 except KeyError:
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90 pass
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91 elif len(args) >= 2 and callable(args[-1]) and callable(args[-2]):
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92 errback = args.pop()
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93 callback = args.pop()
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94 d = self.root.callRemote(name, *args, **kwargs)
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95 if callback is not None:
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96 d.addCallback(self.remoteCallback, callback)
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97 if errback is not None:
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98 d.addErrback(errback)
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99
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100 def _initBridgeEb(self, failure):
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101 log.error(u"Can't init bridge: {msg}".format(msg=failure))
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102
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103 def _set_root(self, root):
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104 """set remote root object
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105
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106 bridge will then be initialised
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107 """
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108 self.root = root
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109 d = root.callRemote("initBridge", self.signals_handler)
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110 d.addErrback(self._initBridgeEb)
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111 return d
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112
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113 def _generic_errback(self, failure):
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114 log.error(u"bridge failure: {}".format(failure))
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115
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116 def bridgeConnect(self, callback, errback):
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117 factory = pb.PBClientFactory()
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118 reactor.connectTCP("localhost", 8789, factory)
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119 d = factory.getRootObject()
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120 d.addCallback(self._set_root)
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121 d.addCallback(lambda dummy: callback())
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122 d.addErrback(errback)
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123
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124 def register_signal(self, functionName, handler, iface="core"):
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125 self.signals_handler.register_signal(functionName, handler, iface)
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126
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127 ##METHODS_PART##