Mercurial > libervia-backend

annotate sat/bridge/bridge_constructor/constructors/pb/pb_frontend_template.py @ 3201:439e2f88c3a9

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core, bridge: new `imageGeneratePreview` helped method to generate a thumbnail
author Goffi <goffi@goffi.org>
date Sun, 01 Mar 2020 18:48:06 +0100
parents 559a625a236b
children f2e30aa031e9
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
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4 # SAT communication bridge
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5 # Copyright (C) 2009-2020 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##