70 lines
2.8 KiB
Python
70 lines
2.8 KiB
Python
import os
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from argparse import Namespace
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from .plugin import Plugin
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from .messenger import Messenger
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from .context import Context
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class Dispatcher(object):
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def __init__(self, base_directory, only=None, skip=None, exit_on_failure=False,
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options=Namespace()):
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self._log = Messenger()
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self._setup_context(base_directory, options)
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self._load_plugins()
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self._only = only
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self._skip = skip
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self._exit = exit_on_failure
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def _setup_context(self, base_directory, options):
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path = os.path.abspath(
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os.path.expanduser(base_directory))
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if not os.path.exists(path):
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raise DispatchError('Nonexistent base directory')
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self._context = Context(path, options)
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def dispatch(self, tasks):
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success = True
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for task in tasks:
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for action in task:
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if (self._only is not None and action not in self._only \
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or self._skip is not None and action in self._skip) \
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and action != 'defaults':
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self._log.info('Skipping action %s' % action)
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continue
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handled = False
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if action == 'defaults':
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self._context.set_defaults(task[action]) # replace, not update
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handled = True
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# keep going, let other plugins handle this if they want
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for plugin in self._plugins:
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if plugin.can_handle(action):
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try:
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local_success = plugin.handle(action, task[action])
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if not local_success and self._exit:
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# The action has failed exit
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self._log.error('Action %s failed' % action)
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return False
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success &= local_success
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handled = True
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except Exception as err:
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self._log.error(
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'An error was encountered while executing action %s' %
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action)
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self._log.debug(err)
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if self._exit:
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# There was an execption exit
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return False
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if not handled:
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success = False
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self._log.error('Action %s not handled' % action)
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if self._exit:
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# Invalid action exit
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return False
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return success
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def _load_plugins(self):
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self._plugins = [plugin(self._context)
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for plugin in Plugin.__subclasses__()]
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class DispatchError(Exception):
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pass
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