150 lines
3.9 KiB
Python
150 lines
3.9 KiB
Python
import asyncio
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import importlib
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import logging
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from threading import RLock
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from ..bus import Bus
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from ..config import Config
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from ..utils import get_enabled_plugins
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logger = logging.getLogger('platypush:context')
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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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# Map: plugin_name -> init_lock to make sure that a plugin isn't initialized
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# multiple times
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plugins_init_locks = {}
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# Reference to the main application bus
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main_bus = None
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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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global main_bus
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if bus:
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main_bus = bus
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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 = ''
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for token in module.__name__.title().split('.')[2:]:
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cls_name += token.title()
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cls_name += '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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logger.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 register_plugins(bus=None):
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from ..plugins import RunnablePlugin
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for plugin in get_enabled_plugins().values():
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if isinstance(plugin, RunnablePlugin):
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plugin.bus = bus
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plugin.start()
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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.get(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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global plugins_init_locks
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if plugin_name not in plugins_init_locks:
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plugins_init_locks[plugin_name] = RLock()
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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 ImportError as e:
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logger.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 = ''
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for token in plugin_name.split('.'):
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cls_name += token.title()
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cls_name += '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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if 'disabled' in plugin_conf:
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if plugin_conf['disabled'] is True:
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return None
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del plugin_conf['disabled']
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if 'enabled' in plugin_conf:
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if plugin_conf['enabled'] is False:
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return None
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del plugin_conf['enabled']
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try:
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plugin_class = getattr(plugin, cls_name)
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except AttributeError as e:
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logger.warning('No such class in {}: {} [error: {}]'.format(plugin_name, cls_name, str(e)))
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raise RuntimeError(e)
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with plugins_init_locks[plugin_name]:
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if plugins.get(plugin_name) and not reload:
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return plugins[plugin_name]
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plugins[plugin_name] = plugin_class(**plugin_conf)
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return plugins[plugin_name]
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def get_bus() -> Bus:
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global main_bus
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assert main_bus, 'The bus is not registered'
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return main_bus
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def get_or_create_event_loop():
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try:
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loop = asyncio.get_event_loop()
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except RuntimeError:
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loop = asyncio.new_event_loop()
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asyncio.set_event_loop(loop)
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return loop
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# vim:sw=4:ts=4:et:
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