Mercurial > libervia-backend

annotate sat/bridge/bridge_constructor/constructors/pb/pb_frontend_template.py @ 3120:0c29155ac68b

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core: backend autoconnection: A new Connection/autoconnect_backend param can be set for a profile or component to be started automatically with backend. This is specially useful for components, but can be useful for client profile too (e.g. on Android we need to start profile with backend to get notifications, this part will come with following commits). The new Sqlite.getIndParamValues method allows to retrieve the same parameters for all profiles.
author Goffi <goffi@goffi.org>
date Sat, 25 Jan 2020 21:08:32 +0100
parents 84bb63e1e4c4
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 communication bridge
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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 import asyncio
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21 from functools import partial
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22 from twisted.spread import pb
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23 from twisted.internet import reactor, defer
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24 from twisted.internet.error import ConnectionRefusedError
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25 from logging import getLogger
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26 from sat.core import exceptions
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27 from sat_frontends.bridge.bridge_frontend import BridgeException
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28
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29 log = getLogger(__name__)
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30
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31
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32 class SignalsHandler(pb.Referenceable):
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33 def __getattr__(self, name):
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34 if name.startswith("remote_"):
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35 log.debug("calling an unregistered signal: {name}".format(name=name[7:]))
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36 return lambda *args, **kwargs: None
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37
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38 else:
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39 raise AttributeError(name)
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40
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41 def register_signal(self, name, handler, iface="core"):
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42 log.debug("registering signal {name}".format(name=name))
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43 method_name = "remote_" + name
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44 try:
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45 self.__getattribute__(method_name)
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46 except AttributeError:
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47 pass
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48 else:
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49 raise exceptions.InternalError(
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50 "{name} signal handler has been registered twice".format(
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51 name=method_name
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52 )
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53 )
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54 setattr(self, method_name, handler)
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55
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56
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57 class Bridge(object):
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58
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59 def __init__(self):
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60 self.signals_handler = SignalsHandler()
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61
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62 def __getattr__(self, name):
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63 return partial(self.call, name)
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64
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65 def _generic_errback(self, err):
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66 log.error(f"bridge error: {err}")
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67
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68 def remoteCallback(self, result, callback):
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69 """call callback with argument or None
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70
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71 if result is not None not argument is used,
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72 else result is used as argument
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73 @param result: remote call result
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74 @param callback(callable): method to call on result
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75 """
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76 if result is None:
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77 callback()
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78 else:
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79 callback(result)
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80
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81 def call(self, name, *args, **kwargs):
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82 """call a remote method
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83
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84 @param name(str): name of the bridge method
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85 @param args(list): arguments
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86 may contain callback and errback as last 2 items
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87 @param kwargs(dict): keyword arguments
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88 may contain callback and errback
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89 """
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90 callback = errback = None
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91 if kwargs:
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92 try:
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93 callback = kwargs.pop("callback")
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94 except KeyError:
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95 pass
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96 try:
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97 errback = kwargs.pop("errback")
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98 except KeyError:
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99 pass
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100 elif len(args) >= 2 and callable(args[-1]) and callable(args[-2]):
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101 errback = args.pop()
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102 callback = args.pop()
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103 d = self.root.callRemote(name, *args, **kwargs)
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104 if callback is not None:
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105 d.addCallback(self.remoteCallback, callback)
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106 if errback is not None:
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107 d.addErrback(errback)
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108
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109 def _initBridgeEb(self, failure_):
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110 log.error("Can't init bridge: {msg}".format(msg=failure_))
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111 return failure_
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112
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113 def _set_root(self, root):
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114 """set remote root object
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115
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116 bridge will then be initialised
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117 """
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118 self.root = root
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119 d = root.callRemote("initBridge", self.signals_handler)
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120 d.addErrback(self._initBridgeEb)
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121 return d
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122
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123 def getRootObjectEb(self, failure_):
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124 """Call errback with appropriate bridge error"""
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125 if failure_.check(ConnectionRefusedError):
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126 raise exceptions.BridgeExceptionNoService
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127 else:
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128 raise failure_
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129
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130 def bridgeConnect(self, callback, errback):
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131 factory = pb.PBClientFactory()
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132 reactor.connectTCP("localhost", 8789, factory)
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133 d = factory.getRootObject()
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134 d.addCallback(self._set_root)
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135 if callback is not None:
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136 d.addCallback(lambda __: callback())
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137 d.addErrback(self.getRootObjectEb)
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138 if errback is not None:
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139 d.addErrback(lambda failure_: errback(failure_.value))
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140 return d
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141
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142 def register_signal(self, functionName, handler, iface="core"):
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143 self.signals_handler.register_signal(functionName, handler, iface)
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144
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145
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146 ##METHODS_PART##
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147
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148 class AIOSignalsHandler(SignalsHandler):
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149
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150 def register_signal(self, name, handler, iface="core"):
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151 async_handler = lambda *args, **kwargs: defer.Deferred.fromFuture(
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152 asyncio.ensure_future(handler(*args, **kwargs)))
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153 return super().register_signal(name, async_handler, iface)
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154
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155
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156 class AIOBridge(Bridge):
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157
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158 def __init__(self):
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159 self.signals_handler = AIOSignalsHandler()
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160
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161 def _errback(self, failure_):
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162 raise BridgeException(
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163 name=failure_.type.decode('utf-8'),
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164 message=str(failure_.value)
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165 )
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166
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167 def call(self, name, *args, **kwargs):
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168 d = self.root.callRemote(name, *args, *kwargs)
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169 d.addErrback(self._errback)
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170 return d.asFuture(asyncio.get_event_loop())
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171
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172 async def bridgeConnect(self):
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173 d = super().bridgeConnect(callback=None, errback=None)
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174 return await d.asFuture(asyncio.get_event_loop())
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175
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176 ##ASYNC_METHODS_PART##