94 lines
2.7 KiB
Python
94 lines
2.7 KiB
Python
import functools
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import importlib
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import logging
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from ..config import Config
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# Map: backend_name -> backend_instance
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backends = {}
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# Map: plugin_name -> plugin_instance
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plugins = {}
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def register_backends(bus=None, global_scope=False, **kwargs):
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""" Initialize the backend objects based on the configuration and returns
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a name -> backend_instance map.
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Params:
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bus -- If specific (it usually should), the messages processed by the
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backends will be posted on this bus.
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kwargs -- Any additional key-value parameters required to initialize the backends
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"""
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if global_scope:
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global backends
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else:
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backends = {}
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for (name, cfg) in Config.get_backends().items():
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module = importlib.import_module('platypush.backend.' + name)
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# e.g. backend.pushbullet main class: PushbulletBackend
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cls_name = functools.reduce(
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lambda a,b: a.title() + b.title(),
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(module.__name__.title().split('.')[2:])
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) + 'Backend'
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try:
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b = getattr(module, cls_name)(bus=bus, **cfg, **kwargs)
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backends[name] = b
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except AttributeError as e:
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logging.warning('No such class in {}: {}'.format(
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module.__name__, cls_name))
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raise RuntimeError(e)
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return backends
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def get_backend(name):
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""" Returns the backend instance identified by name if it exists """
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global backends
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return backends[name]
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def get_plugin(plugin_name, reload=False):
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""" Registers a plugin instance by name if not registered already, or
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returns the registered plugin instance"""
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global plugins
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if plugin_name in plugins and not reload:
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return plugins[plugin_name]
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try:
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plugin = importlib.import_module('platypush.plugins.' + plugin_name)
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except ModuleNotFoundError as e:
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logging.warning('No such plugin: {}'.format(plugin_name))
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raise RuntimeError(e)
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# e.g. plugins.music.mpd main class: MusicMpdPlugin
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cls_name = functools.reduce(
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lambda a,b: a.title() + b.title(),
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(plugin_name.title().split('.'))
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) + 'Plugin'
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plugin_conf = Config.get_plugins()[plugin_name] \
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if plugin_name in Config.get_plugins() else {}
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try:
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plugin_class = getattr(plugin, cls_name)
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plugin = plugin_class(**plugin_conf)
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plugins[plugin_name] = plugin
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except AttributeError as e:
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logging.warning('No such class in {}: {}'.format(plugin_name, cls_name))
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raise RuntimeError(e)
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plugins[plugin_name] = plugin
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return plugin
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def register_plugin(name, plugin, **kwargs):
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""" Registers a plugin instance by name """
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global plugins
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# vim:sw=4:ts=4:et:
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