Mercurial > libervia-backend
annotate sat/bridge/bridge_constructor/constructors/pb/pb_frontend_template.py @ 3792:865167c34b82
comp AP gateway: convert pubsub item retractation to AP `Delete` activity:
when an item `retract` is received from a node from which an AP actor is subscribed, a
corresponding `Delete` activity is created and sent to AP followers.
Trying to retract an item from a virtual node of the gateway pubsub service now return a
`forbidden` stanza error (those nodes are handled on AP side and thus are not owned by
XMPP entities).
rel 367
author | Goffi <goffi@goffi.org> |
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date | Fri, 17 Jun 2022 14:15:23 +0200 |
parents | 3c7a64d6f49f |
children | 524856bd7b19 |
rev | line source |
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3028 | 1 #!/usr/bin/env python3 |
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3 # SàT communication bridge |
3479 | 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_"): |
3028 | 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( |
3028 | 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 getConf = partial(config.getConf, conf, "bridge_pb", "") |
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144 conn_type = getConf("connection_type", "unix_socket") |
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145 if conn_type == "unix_socket": |
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146 local_dir = Path(config.getConfig(conf, "", "local_dir")).resolve() |
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147 socket_path = local_dir / "bridge_pb" |
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148 reactor.connectUNIX(str(socket_path), factory) |
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149 elif conn_type == "socket": |
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150 host = getConf("host", "localhost") |
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151 port = int(getConf("port", 8789)) |
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152 reactor.connectTCP(host, port, factory) |
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153 else: |
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154 raise ValueError(f"Unknown pb connection type: {conn_type!r}") |
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155 d = factory.getRootObject() |
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156 d.addCallback(self._set_root) |
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157 if callback is not None: |
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158 d.addCallback(lambda __: callback()) |
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159 d.addErrback(self.getRootObjectEb) |
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160 if errback is not None: |
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161 d.addErrback(lambda failure_: errback(failure_.value)) |
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162 return d |
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163 |
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164 def register_signal(self, functionName, handler, iface="core"): |
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165 self.signals_handler.register_signal(functionName, handler, iface) |
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166 |
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167 |
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168 ##METHODS_PART## |
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169 |
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170 class AIOSignalsHandler(SignalsHandler): |
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171 |
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172 def register_signal(self, name, handler, iface="core"): |
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173 async_handler = lambda *args, **kwargs: defer.Deferred.fromFuture( |
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174 asyncio.ensure_future(handler(*args, **kwargs))) |
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175 return super().register_signal(name, async_handler, iface) |
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176 |
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177 |
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178 class AIOBridge(Bridge): |
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179 |
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180 def __init__(self): |
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181 self.signals_handler = AIOSignalsHandler() |
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182 |
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183 def _errback(self, failure_): |
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184 """Convert Failure to BridgeException""" |
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185 raise BridgeException( |
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186 name=failure_.type.decode('utf-8'), |
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187 message=str(failure_.value) |
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188 ) |
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189 |
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190 def call(self, name, *args, **kwargs): |
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191 d = self.root.callRemote(name, *args, *kwargs) |
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192 d.addErrback(self._errback) |
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193 return d.asFuture(asyncio.get_event_loop()) |
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194 |
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195 async def bridgeConnect(self): |
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196 d = super().bridgeConnect(callback=None, errback=None) |
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197 return await d.asFuture(asyncio.get_event_loop()) |
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198 |
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199 ##ASYNC_METHODS_PART## |