Mercurial > libervia-backend
changeset 2092:5e79ba00c1e2
bridbe(pb): Perspective Broker bridge, first draft
author | Goffi <goffi@goffi.org> |
---|---|
date | Tue, 13 Dec 2016 22:27:49 +0100 (2016-12-13) |
parents | f413bfc24458 |
children | cbf3af02e941 |
files | src/bridge/bridge_constructor/constructors/pb/__init__.py src/bridge/bridge_constructor/constructors/pb/constructor.py src/bridge/bridge_constructor/constructors/pb/pb_core_template.py src/bridge/bridge_constructor/constructors/pb/pb_frontend_template.py |
diffstat | 3 files changed, 284 insertions(+), 0 deletions(-) [+] |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/bridge/bridge_constructor/constructors/pb/constructor.py Tue Dec 13 22:27:49 2016 +0100 @@ -0,0 +1,56 @@ +#!/usr/bin/env python2 +#-*- coding: utf-8 -*- + +# SàT: a XMPP client +# Copyright (C) 2009-2016 Jérôme Poisson (goffi@goffi.org) + +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU Affero General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU Affero General Public License for more details. + +# You should have received a copy of the GNU Affero General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. + +from sat.bridge.bridge_constructor import base_constructor + + +class pbConstructor(base_constructor.Constructor): + NAME = "pb" + CORE_TEMPLATE = "pb_core_template.py" + CORE_DEST = "pb.py" + CORE_FORMATS = { + 'signals': """\ + def {name}(self, {args}): + {debug}self.sendSignal("{name}", {args_no_def})\n""", + } + + FRONTEND_TEMPLATE = "pb_frontend_template.py" + FRONTEND_DEST = CORE_DEST + FRONTEND_FORMATS = { + 'methods': """\ + def {name}(self{args_comma}{args}, callback=None, errback=None): + {debug}d = self.root.callRemote("{name}"{args_comma}{args_no_def}) + if callback is not None: + d.addCallback({callback}) + if errback is None: + errback = self._generic_errback + d.addErrback(errback)\n""", + } + + def core_completion_signal(self, completion, function, default, arg_doc, async_): + completion['args_no_def'] = self.getArguments(function['sig_in'], name=arg_doc) + completion['debug'] = "" if not self.args.debug else 'log.debug ("%s")\n%s' % (completion['name'], 8 * ' ') + + def frontend_completion_method(self, completion, function, default, arg_doc, async_): + completion.update({ + 'args_comma': ', ' if function['sig_in'] else '', + 'args_no_def': self.getArguments(function['sig_in'], name=arg_doc), + 'callback': 'callback' if function['sig_out'] else 'lambda dummy: callback()', + 'debug': "" if not self.args.debug else 'log.debug ("%s")\n%s' % (completion['name'], 8 * ' '), + })
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/bridge/bridge_constructor/constructors/pb/pb_core_template.py Tue Dec 13 22:27:49 2016 +0100 @@ -0,0 +1,101 @@ +#!/usr/bin/env python2 +#-*- coding: utf-8 -*- + +# SAT: a jabber client +# Copyright (C) 2009-2016 Jérôme Poisson (goffi@goffi.org) + +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU Affero General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU Affero General Public License for more details. + +# You should have received a copy of the GNU Affero General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. + + +from sat.core.log import getLogger +log = getLogger(__name__) +from twisted.spread import jelly, pb +from twisted.internet import reactor + + +## jelly hack +# we monkey patch jelly to handle namedtuple +ori_jelly = jelly._Jellier.jelly + +def fixed_jelly(self, obj): + """this method fix handling of namedtuple""" + if isinstance(obj, tuple) and not obj is tuple: + obj = tuple(obj) + return ori_jelly(self, obj) + +jelly._Jellier.jelly = fixed_jelly + + +class PBRoot(pb.Root): + + def __init__(self): + self.signals_handlers = [] + + def remote_initBridge(self, signals_handler): + self.signals_handlers.append(signals_handler) + log.info(u"registered signal handler") + + def sendSignalEb(self, failure, signal_name): + log.error(u"Error while sending signal {name}: {msg}".format( + name = signal_name, + msg = failure, + )) + + def sendSignal(self, name, args, kwargs): + to_remove = [] + for handler in self.signals_handlers: + try: + d = handler.callRemote(name, *args, **kwargs) + except pb.DeadReferenceError: + to_remove.append(handler) + else: + d.addErrback(self.sendSignalEb, name) + if to_remove: + for handler in to_remove: + log.debug(u"Removing signal handler for dead frontend") + self.signals_handlers.remove(handler) + +##METHODS_PART## + + +class Bridge(object): + + def __init__(self): + log.info("Init Perspective Broker...") + self.root = PBRoot() + reactor.listenTCP(8789, pb.PBServerFactory(self.root)) + + def sendSignal(self, name, *args, **kwargs): + self.root.sendSignal(name, args, kwargs) + + def remote_initBridge(self, signals_handler): + self.signals_handlers.append(signals_handler) + log.info(u"registered signal handler") + + def register_method(self, name, callback): + log.debug("registering PB bridge method [%s]" % name) + setattr(self.root, "remote_"+name, callback) + # self.root.register_method(name, callback) + + def addMethod(self, name, int_suffix, in_sign, out_sign, method, async=False, doc={}): + """Dynamically add a method to PB Bridge""" + #FIXME: doc parameter is kept only temporary, the time to remove it from calls + log.debug("Adding method {name} to PB bridge".format(name=name)) + self.register_method(name, method) + + def addSignal(self, name, int_suffix, signature, doc={}): + log.debug("Adding signal {name} to PB bridge".format(name=name)) + setattr(self, name, lambda *args, **kwargs: self.sendSignal(name, *args, **kwargs)) + +##SIGNALS_PART##
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/bridge/bridge_constructor/constructors/pb/pb_frontend_template.py Tue Dec 13 22:27:49 2016 +0100 @@ -0,0 +1,127 @@ +#!/usr/bin/env python2 +#-*- coding: utf-8 -*- + +# SAT communication bridge +# Copyright (C) 2009-2016 Jérôme Poisson (goffi@goffi.org) + +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU Affero General Public License as published by +# the Free Software Foundation, either version 3 of the License, or +# (at your option) any later version. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU Affero General Public License for more details. + +# You should have received a copy of the GNU Affero General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. + +from sat.core.log import getLogger +log = getLogger(__name__) +from sat.core import exceptions +from twisted.spread import pb +from twisted.internet import reactor + + +class SignalsHandler(pb.Referenceable): + + def __getattr__(self, name): + if name.startswith("remote_"): + log.debug(u"calling an unregistered signal: {name}".format( + name = name[7:])) + return lambda *args, **kwargs: None + + else: + raise AttributeError(name) + + def register_signal(self, name, handler, iface="core"): + log.debug("registering signal {name}".format(name=name)) + method_name = "remote_" + name + try: + self.__getattribute__(self, method_name) + except AttributeError: + pass + else: + raise exceptions.InternalError(u"{name} signal handler has been registered twice".format( + name = method_name)) + setattr(self, method_name, handler) + + +class Bridge(object): + + def __init__(self): + self.signals_handler = SignalsHandler() + + def __getattr__(self, name): + return lambda *args, **kwargs: self.call(name, args, kwargs) + + def remoteCallback(self, result, callback): + """call callback with argument or None + + if result is not None not argument is used, + else result is used as argument + @param result: remote call result + @param callback(callable): method to call on result + """ + if result is None: + callback() + else: + callback(result) + + def call(self, name, args, kwargs): + """call a remote method + + @param name(str): name of the bridge method + @param args(list): arguments + may contain callback and errback as last 2 items + @param kwargs(dict): keyword arguments + may contain callback and errback + """ + callback = errback = None + if kwargs: + try: + callback = kwargs.pop('callback') + except KeyError: + pass + try: + errback = kwargs.pop('errback') + except KeyError: + pass + elif len(args) >= 2 and callable(args[-1]) and callable(args[-2]): + errback = args.pop() + callback = args.pop() + d = self.root.callRemote(name, *args, **kwargs) + if callback is not None: + d.addCallback(self.remoteCallback, callback) + if errback is not None: + d.addErrback(errback) + + def _initBridgeEb(self, failure): + log.error(u"Can't init bridge: {msg}".format(msg=failure)) + + def _set_root(self, root): + """set remote root object + + bridge will then be initialised + """ + self.root = root + d = root.callRemote("initBridge", self.signals_handler) + d.addErrback(self._initBridgeEb) + return d + + def _generic_errback(self, failure): + log.error(u"bridge failure: {}".format(failure)) + + def bridgeConnect(self, callback, errback): + factory = pb.PBClientFactory() + reactor.connectTCP("localhost", 8789, factory) + d = factory.getRootObject() + d.addCallback(self._set_root) + d.addCallback(lambda dummy: callback()) + d.addErrback(errback) + + def register_signal(self, functionName, handler, iface="core"): + self.signals_handler.register_signal(functionName, handler, iface) + +##METHODS_PART##