Mercurial > libervia-backend
annotate src/bridge/bridge_constructor/constructors/pb/pb_frontend_template.py @ 2342:f047d5410040
core (memory/disco): added use_cache parameter to discoInfos/discoItems (set to False to ignore cache)
author | Goffi <goffi@goffi.org> |
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date | Tue, 22 Aug 2017 22:12:57 +0200 |
parents | 5e79ba00c1e2 |
children | 8b37a62336c3 |
rev | line source |
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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 |
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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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Goffi <goffi@goffi.org>
parents:
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120 d.addCallback(self._set_root) |
5e79ba00c1e2
bridbe(pb): Perspective Broker bridge, first draft
Goffi <goffi@goffi.org>
parents:
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changeset
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121 d.addCallback(lambda dummy: callback()) |
5e79ba00c1e2
bridbe(pb): Perspective Broker bridge, first draft
Goffi <goffi@goffi.org>
parents:
diff
changeset
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122 d.addErrback(errback) |
5e79ba00c1e2
bridbe(pb): Perspective Broker bridge, first draft
Goffi <goffi@goffi.org>
parents:
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changeset
|
123 |
5e79ba00c1e2
bridbe(pb): Perspective Broker bridge, first draft
Goffi <goffi@goffi.org>
parents:
diff
changeset
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124 def register_signal(self, functionName, handler, iface="core"): |
5e79ba00c1e2
bridbe(pb): Perspective Broker bridge, first draft
Goffi <goffi@goffi.org>
parents:
diff
changeset
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125 self.signals_handler.register_signal(functionName, handler, iface) |
5e79ba00c1e2
bridbe(pb): Perspective Broker bridge, first draft
Goffi <goffi@goffi.org>
parents:
diff
changeset
|
126 |
5e79ba00c1e2
bridbe(pb): Perspective Broker bridge, first draft
Goffi <goffi@goffi.org>
parents:
diff
changeset
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127 ##METHODS_PART## |