Mercurial > libervia-backend

annotate sat/bridge/bridge_constructor/constructors/pb/pb_frontend_template.py @ 3317:83f25da66bec

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core (memory): files are now public by default except for those in root directory: using public permissions by default makes permissions change more easy as we don't have to recursively change all permissions of sub files when changing directory. Root directories are private by default.
author Goffi <goffi@goffi.org>
date Sat, 01 Aug 2020 16:02:41 +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##