Mercurial > libervia-backend

annotate sat/bridge/bridge_constructor/constructors/pb/pb_frontend_template.py @ 3370:2157880ba3b4

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core: plugins can now be loaded from a directory: A plugin can now be a directory with a name starting by `plugin_`. It will then be loaded as a module. The `__init__.py` file must contain the `PLUGIN_INFO` dict with metadata.
author Goffi <goffi@goffi.org>
date Sun, 20 Sep 2020 14:05:40 +0200
parents f2e30aa031e9
children be6d91572633
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
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3 # SàT communication bridge
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4 # Copyright (C) 2009-2020 Jérôme Poisson (goffi@goffi.org)
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5
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6 # This program is free software: you can redistribute it and/or modify
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7 # it under the terms of the GNU Affero General Public License as published by
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8 # the Free Software Foundation, either version 3 of the License, or
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9 # (at your option) any later version.
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10
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11 # This program is distributed in the hope that it will be useful,
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 # GNU Affero General Public License for more details.
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15
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16 # You should have received a copy of the GNU Affero General Public License
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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18
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19 import asyncio
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20 from functools import partial
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21 from twisted.spread import pb
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22 from twisted.internet import reactor, defer
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23 from twisted.internet.error import ConnectionRefusedError
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24 from logging import getLogger
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25 from sat.core import exceptions
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26 from sat_frontends.bridge.bridge_frontend import BridgeException
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27
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28 log = getLogger(__name__)
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29
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30
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31 class SignalsHandler(pb.Referenceable):
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32 def __getattr__(self, name):
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33 if name.startswith("remote_"):
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34 log.debug("calling an unregistered signal: {name}".format(name=name[7:]))
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35 return lambda *args, **kwargs: None
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36
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37 else:
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38 raise AttributeError(name)
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39
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40 def register_signal(self, name, handler, iface="core"):
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41 log.debug("registering signal {name}".format(name=name))
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42 method_name = "remote_" + name
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43 try:
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44 self.__getattribute__(method_name)
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45 except AttributeError:
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46 pass
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47 else:
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48 raise exceptions.InternalError(
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49 "{name} signal handler has been registered twice".format(
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50 name=method_name
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51 )
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52 )
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53 setattr(self, method_name, handler)
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54
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55
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56 class Bridge(object):
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57
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58 def __init__(self):
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59 self.signals_handler = SignalsHandler()
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60
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61 def __getattr__(self, name):
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62 return partial(self.call, name)
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63
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64 def _generic_errback(self, err):
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65 log.error(f"bridge error: {err}")
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66
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67 def _errback(self, failure_, ori_errback):
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68 """Convert Failure to BridgeException"""
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69 ori_errback(
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70 BridgeException(
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71 name=failure_.type.decode('utf-8'),
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72 message=str(failure_.value)
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73 )
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74 )
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75
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76 def remoteCallback(self, result, callback):
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77 """call callback with argument or None
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78
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79 if result is not None not argument is used,
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80 else result is used as argument
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81 @param result: remote call result
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82 @param callback(callable): method to call on result
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83 """
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84 if result is None:
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85 callback()
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86 else:
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87 callback(result)
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88
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89 def call(self, name, *args, **kwargs):
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90 """call a remote method
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91
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92 @param name(str): name of the bridge method
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93 @param args(list): arguments
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94 may contain callback and errback as last 2 items
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95 @param kwargs(dict): keyword arguments
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96 may contain callback and errback
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97 """
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98 callback = errback = None
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99 if kwargs:
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100 try:
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101 callback = kwargs.pop("callback")
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102 except KeyError:
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103 pass
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104 try:
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105 errback = kwargs.pop("errback")
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106 except KeyError:
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107 pass
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108 elif len(args) >= 2 and callable(args[-1]) and callable(args[-2]):
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109 errback = args.pop()
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110 callback = args.pop()
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111 d = self.root.callRemote(name, *args, **kwargs)
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112 if callback is not None:
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113 d.addCallback(self.remoteCallback, callback)
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114 if errback is not None:
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115 d.addErrback(errback)
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116
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117 def _initBridgeEb(self, failure_):
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118 log.error("Can't init bridge: {msg}".format(msg=failure_))
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119 return failure_
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120
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121 def _set_root(self, root):
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122 """set remote root object
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123
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124 bridge will then be initialised
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125 """
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126 self.root = root
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127 d = root.callRemote("initBridge", self.signals_handler)
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128 d.addErrback(self._initBridgeEb)
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129 return d
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130
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131 def getRootObjectEb(self, failure_):
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132 """Call errback with appropriate bridge error"""
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133 if failure_.check(ConnectionRefusedError):
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134 raise exceptions.BridgeExceptionNoService
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135 else:
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136 raise failure_
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137
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138 def bridgeConnect(self, callback, errback):
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139 factory = pb.PBClientFactory()
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140 reactor.connectTCP("localhost", 8789, factory)
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141 d = factory.getRootObject()
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142 d.addCallback(self._set_root)
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143 if callback is not None:
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144 d.addCallback(lambda __: callback())
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145 d.addErrback(self.getRootObjectEb)
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146 if errback is not None:
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147 d.addErrback(lambda failure_: errback(failure_.value))
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148 return d
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149
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150 def register_signal(self, functionName, handler, iface="core"):
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151 self.signals_handler.register_signal(functionName, handler, iface)
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152
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153
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154 ##METHODS_PART##
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155
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156 class AIOSignalsHandler(SignalsHandler):
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157
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158 def register_signal(self, name, handler, iface="core"):
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159 async_handler = lambda *args, **kwargs: defer.Deferred.fromFuture(
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160 asyncio.ensure_future(handler(*args, **kwargs)))
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161 return super().register_signal(name, async_handler, iface)
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162
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163
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164 class AIOBridge(Bridge):
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165
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166 def __init__(self):
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167 self.signals_handler = AIOSignalsHandler()
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168
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169 def _errback(self, failure_):
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170 """Convert Failure to BridgeException"""
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171 raise BridgeException(
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172 name=failure_.type.decode('utf-8'),
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173 message=str(failure_.value)
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174 )
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175
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176 def call(self, name, *args, **kwargs):
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177 d = self.root.callRemote(name, *args, *kwargs)
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178 d.addErrback(self._errback)
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179 return d.asFuture(asyncio.get_event_loop())
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180
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181 async def bridgeConnect(self):
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182 d = super().bridgeConnect(callback=None, errback=None)
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183 return await d.asFuture(asyncio.get_event_loop())
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184
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185 ##ASYNC_METHODS_PART##