Mercurial > libervia-backend
diff src/bridge/bridge_constructor/constructors/embedded/embedded_template.py @ 2087:159250d66407
bridge (constructor): embedded bridge generator:
"embedded" is used to have backend and frontend together in the same process (frontend call backend as a module).
author | Goffi <goffi@goffi.org> |
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date | Wed, 05 Oct 2016 22:07:51 +0200 |
parents | |
children | f413bfc24458 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/bridge/bridge_constructor/constructors/embedded/embedded_template.py Wed Oct 05 22:07:51 2016 +0200 @@ -0,0 +1,105 @@ +#!/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.core.log import getLogger +log = getLogger(__name__) +from sat.core import exceptions + + +class _Bridge(object): + def __init__(self): + log.info(u"Init embedded bridge...") + self._methods_cbs = {} + self._signals_cbs = { + "core": {}, + "plugin": {} + } + + def register_method(self, name, callback): + log.debug(u"registering embedded bridge method [{}]".format(name)) + if name in self._methods_cbs: + raise exceptions.ConflictError(u"method {} is already regitered".format(name)) + self._methods_cbs[name] = callback + + def register_signal(self, functionName, handler, iface="core"): + iface_dict = self._signals_cbs[iface] + if functionName in iface_dict: + raise exceptions.ConflictError(u"signal {name} is already regitered for interface {iface}".format(name=functionName, iface=iface)) + iface_dict[functionName] = handler + + def call_method(self, name, out_sign, async_, args, kwargs): + callback = kwargs.pop("callback", None) + errback = kwargs.pop("errback", None) + if async_: + d = self._methods_cbs[name](*args, **kwargs) + if callback is not None: + d.addCallback(callback if out_sign else lambda dummy: callback()) + if errback is None: + d.addErrback(lambda failure_: log.error(failure_)) + else: + d.addErrback(errback) + return d + else: + try: + ret = self._methods_cbs[name](*args, **kwargs) + except Exception as e: + if errback is not None: + errback(e) + else: + raise e + else: + if callback is None: + return ret + else: + if out_sign: + callback(ret) + else: + callback() + + def send_signal(self, name, args, kwargs): + try: + cb = self._signals_cbs["plugin"][name] + except KeyError: + log.warning(u"ignoring signal {}: no callback registered".format(name)) + else: + cb(*args, **kwargs) + + def addMethod(self, name, int_suffix, in_sign, out_sign, method, async=False, doc={}): + #FIXME: doc parameter is kept only temporary, the time to remove it from calls + log.debug("Adding method [{}] to embedded bridge".format(name)) + self.register_method(name, method) + setattr(self.__class__, name, lambda self_, *args, **kwargs: self.call_method(name, out_sign, async, args, kwargs)) + + def addSignal(self, name, int_suffix, signature, doc={}): + setattr(self.__class__, name, lambda self_, *args, **kwargs: self.send_signal(name, args, kwargs)) + + ## signals ## + +##SIGNALS_PART## + ## methods ## + +##METHODS_PART## + +# we want the same instance for both core and frontend +bridge = None +def Bridge(): + global bridge + if bridge is None: + bridge = _Bridge() + return bridge