Mercurial > libervia-backend

annotate sat/bridge/bridge_constructor/constructors/pb/pb_frontend_template.py @ 3489:d71a163c0861

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bridge (pb): connection can be set to used either UNIX socket or TCP socket: all settings are to be put in `[DEFAULT]` section - `bridge_pb_connection_type` can be set to `unix_socket` or `socket` - for `socket`, `bridge_pb_host` and `bridge_pb_port` can be specified
author Goffi <goffi@goffi.org>
date Sun, 21 Mar 2021 22:00:55 +0100
parents be6d91572633
children 3c7a64d6f49f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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) 2009-2021 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 logging import getLogger
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21 from functools import partial
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22 from pathlib import Path
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23 from twisted.spread import pb
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24 from twisted.internet import reactor, defer
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25 from twisted.internet.error import ConnectionRefusedError, ConnectError
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26 from sat.core import exceptions
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27 from sat.tools import config
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28 from sat_frontends.bridge.bridge_frontend import BridgeException
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29
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30 log = getLogger(__name__)
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31
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32
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33 class SignalsHandler(pb.Referenceable):
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34 def __getattr__(self, name):
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35 if name.startswith("remote_"):
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36 log.debug("calling an unregistered signal: {name}".format(name=name[7:]))
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37 return lambda *args, **kwargs: None
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38
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39 else:
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40 raise AttributeError(name)
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41
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42 def register_signal(self, name, handler, iface="core"):
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43 log.debug("registering signal {name}".format(name=name))
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44 method_name = "remote_" + name
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45 try:
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46 self.__getattribute__(method_name)
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47 except AttributeError:
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48 pass
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49 else:
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50 raise exceptions.InternalError(
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51 "{name} signal handler has been registered twice".format(
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52 name=method_name
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53 )
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54 )
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55 setattr(self, method_name, handler)
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56
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57
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58 class Bridge(object):
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59
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60 def __init__(self):
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61 self.signals_handler = SignalsHandler()
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62
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63 def __getattr__(self, name):
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64 return partial(self.call, name)
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65
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66 def _generic_errback(self, err):
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67 log.error(f"bridge error: {err}")
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68
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69 def _errback(self, failure_, ori_errback):
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70 """Convert Failure to BridgeException"""
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71 ori_errback(
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72 BridgeException(
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73 name=failure_.type.decode('utf-8'),
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74 message=str(failure_.value)
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75 )
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76 )
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77
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78 def remoteCallback(self, result, callback):
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79 """call callback with argument or None
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80
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81 if result is not None not argument is used,
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82 else result is used as argument
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83 @param result: remote call result
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84 @param callback(callable): method to call on result
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85 """
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86 if result is None:
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87 callback()
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88 else:
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89 callback(result)
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90
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91 def call(self, name, *args, **kwargs):
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92 """call a remote method
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93
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94 @param name(str): name of the bridge method
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95 @param args(list): arguments
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96 may contain callback and errback as last 2 items
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97 @param kwargs(dict): keyword arguments
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98 may contain callback and errback
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99 """
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100 callback = errback = None
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101 if kwargs:
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102 try:
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103 callback = kwargs.pop("callback")
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104 except KeyError:
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105 pass
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106 try:
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107 errback = kwargs.pop("errback")
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108 except KeyError:
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109 pass
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110 elif len(args) >= 2 and callable(args[-1]) and callable(args[-2]):
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111 errback = args.pop()
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112 callback = args.pop()
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113 d = self.root.callRemote(name, *args, **kwargs)
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114 if callback is not None:
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115 d.addCallback(self.remoteCallback, callback)
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116 if errback is not None:
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117 d.addErrback(errback)
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118
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119 def _initBridgeEb(self, failure_):
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120 log.error("Can't init bridge: {msg}".format(msg=failure_))
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121 return failure_
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122
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123 def _set_root(self, root):
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124 """set remote root object
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125
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126 bridge will then be initialised
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127 """
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128 self.root = root
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129 d = root.callRemote("initBridge", self.signals_handler)
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130 d.addErrback(self._initBridgeEb)
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131 return d
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132
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133 def getRootObjectEb(self, failure_):
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134 """Call errback with appropriate bridge error"""
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135 if failure_.check(ConnectionRefusedError, ConnectError):
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136 raise exceptions.BridgeExceptionNoService
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137 else:
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138 raise failure_
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139
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140 def bridgeConnect(self, callback, errback):
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141 factory = pb.PBClientFactory()
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142 conf = config.parseMainConf()
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143 conn_type = config.getConfig(
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144 conf,
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145 "",
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146 "bridge_pb_connection_type",
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147 "unix_socket"
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148 )
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149 if conn_type == "unix_socket":
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150 local_dir = Path(config.getConfig(conf, "", "local_dir")).resolve()
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151 socket_path = local_dir / "bridge_pb"
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152 reactor.connectUNIX(str(socket_path), factory)
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153 elif conn_type == "socket":
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154 host = int(config.getConfig(
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155 conf,
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156 "",
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157 "bridge_pb_host",
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158 "localhost"
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159 ))
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160 port = int(config.getConfig(
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161 conf,
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162 "",
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163 "bridge_pb_port",
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164 8789
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165 ))
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166 reactor.connectTCP(host, port, factory)
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167 else:
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168 raise ValueError(f"Unknown pb connection type: {conn_type!r}")
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169 d = factory.getRootObject()
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170 d.addCallback(self._set_root)
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171 if callback is not None:
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172 d.addCallback(lambda __: callback())
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173 d.addErrback(self.getRootObjectEb)
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174 if errback is not None:
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175 d.addErrback(lambda failure_: errback(failure_.value))
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176 return d
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177
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178 def register_signal(self, functionName, handler, iface="core"):
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179 self.signals_handler.register_signal(functionName, handler, iface)
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180
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181
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182 ##METHODS_PART##
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183
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184 class AIOSignalsHandler(SignalsHandler):
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185
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186 def register_signal(self, name, handler, iface="core"):
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187 async_handler = lambda *args, **kwargs: defer.Deferred.fromFuture(
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188 asyncio.ensure_future(handler(*args, **kwargs)))
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189 return super().register_signal(name, async_handler, iface)
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190
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191
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192 class AIOBridge(Bridge):
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193
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194 def __init__(self):
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195 self.signals_handler = AIOSignalsHandler()
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196
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197 def _errback(self, failure_):
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198 """Convert Failure to BridgeException"""
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199 raise BridgeException(
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200 name=failure_.type.decode('utf-8'),
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201 message=str(failure_.value)
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202 )
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203
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204 def call(self, name, *args, **kwargs):
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205 d = self.root.callRemote(name, *args, *kwargs)
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206 d.addErrback(self._errback)
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207 return d.asFuture(asyncio.get_event_loop())
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208
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209 async def bridgeConnect(self):
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210 d = super().bridgeConnect(callback=None, errback=None)
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211 return await d.asFuture(asyncio.get_event_loop())
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212
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213 ##ASYNC_METHODS_PART##