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annotate src/bridge/bridge_constructor/constructors/pb/pb_frontend_template.py @ 2092:5e79ba00c1e2

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bridbe(pb): Perspective Broker bridge, first draft
author Goffi <goffi@goffi.org>
date Tue, 13 Dec 2016 22:27:49 +0100
parents
children 8b37a62336c3
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rev   line source
2092
5e79ba00c1e2 bridbe(pb): Perspective Broker bridge, first draft
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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
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5 # Copyright (C) 2009-2016 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##