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annotate sat/bridge/bridge_constructor/constructors/pb/pb_frontend_template.py @ 3223:163014f09bf4
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author | Goffi <goffi@goffi.org> |
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date | Sun, 22 Mar 2020 14:04:16 +0100 |
parents | 559a625a236b |
children | f2e30aa031e9 |
rev | line source |
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3028 | 1 #!/usr/bin/env python3 |
3137 | 2 |
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3 |
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4 # SAT communication bridge |
3136 | 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_"): |
3028 | 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( |
3028 | 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## |