Mercurial > libervia-backend

annotate src/bridge/bridge_constructor/constructors/pb/pb_frontend_template.py @ 2532:772447ec070f

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jp: pubsub options refactoring: There is now only "use_pubsub", and specification are set using "pubsub_flags" argument when instantiating CommandBase. Options are more Python Zen compliant by using explicit arguments for item, draft, url instead of trying to guess with magic keyword and type detection. Pubsub node and item are now always using respecively "-n" and "-i" even when required, this way shell history can be used to change command more easily, and it's globally less confusing for user. if --pubsub-url is used, elements can be overwritten with individual option (e.g. change item id with --item). New "use_draft" argument in CommandBase, to re-use current draft or open a file path as draft. Item can now be specified when using a draft. If it already exists, its content will be added to current draft (with a separator), to avoid loosing data. common.BaseEdit.getItemPath could be simplified thanks to those changes. Pubsub URI handling has been moved to base.py.
author Goffi <goffi@goffi.org>
date Wed, 21 Mar 2018 19:13:22 +0100
parents 0046283a285d
children
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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) 2009-2018 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##