61 lines
1.9 KiB
Python
61 lines
1.9 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (C) 2014-2016 Andrey Antukh <niwi@niwi.nz>
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import abc
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import importlib
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from django.core.exceptions import ImproperlyConfigured
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from django.conf import settings
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class BaseEventsPushBackend(object, metaclass=abc.ABCMeta):
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@abc.abstractmethod
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def emit_event(self, message:str, *, routing_key:str, channel:str="events"):
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pass
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def load_class(path):
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"""
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Load class from path.
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"""
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mod_name, klass_name = path.rsplit('.', 1)
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try:
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mod = importlib.import_module(mod_name)
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except AttributeError as e:
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raise ImproperlyConfigured('Error importing {0}: "{1}"'.format(mod_name, e))
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try:
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klass = getattr(mod, klass_name)
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except AttributeError:
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raise ImproperlyConfigured('Module "{0}" does not define a "{1}" class'.format(mod_name, klass_name))
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return klass
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def get_events_backend(path:str=None, options:dict=None):
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if path is None:
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path = getattr(settings, "EVENTS_PUSH_BACKEND", None)
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if path is None:
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raise ImproperlyConfigured("Events push system not configured")
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if options is None:
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options = getattr(settings, "EVENTS_PUSH_BACKEND_OPTIONS", {})
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cls = load_class(path)
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return cls(**options)
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