celery-pylons / celerypylons / loader.py

from celery.loaders.base import BaseLoader
from pylons import config
import types


to_pylons = lambda x: x.replace('_','.').lower()
to_celery = lambda x: x.replace('.', '_').upper()


class PylonsSettingsProxy(object):
    """
    Proxies settings from pylons.config
    """
    def __getattr__(self, key):
        pylons_key = to_pylons(key)
        try:
            value = config[pylons_key]
            if len(value.split()) > 1: return value.split()
            return value
        except KeyError:
            raise AttributeError(pylons_key)
    
    def __setattr__(self, key, value):
        pylons_key = to_pylons(key)
        config[pylons_key] = value
        

class PylonsLoader(BaseLoader):
    """
    Pylons celery loader.

        * Maps the celery config onto pylons.config

    """
    def read_configuration(self):
        self.configured = True
        return PylonsSettingsProxy()

    def on_worker_init(self):
        """
        Import task modules.
        """
        # @@ Patch for when user only provides 1 module
        celery_imports = config.get('celery.imports', [])
        if isinstance(celery_imports, types.StringTypes):
            config['celery.imports'] = [celery_imports]
        self.import_default_modules()
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