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from celery.loaders.base import BaseLoader
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from pylons import config
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to_pylons = lambda x: x.replace('_', '.').lower()
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to_celery = lambda x: x.replace('.', '_').upper()
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LIST_PARAMS = """CELERY_IMPORTS ADMINS ROUTES""".split()
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class PylonsSettingsProxy(object):
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"""Pylons Settings Proxy
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Proxies settings from pylons.config
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"""
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def __getattr__(self, key):
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pylons_key = to_pylons(key)
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try:
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value = config[pylons_key]
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if key in LIST_PARAMS:return value.split()
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return self.type_converter(value)
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except KeyError:
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raise AttributeError(pylons_key)
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def get(self, key):
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try:
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return self.__getattr__(key)
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except AttributeError:
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return None
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def __getitem__(self, key):
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try:
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return self.__getattr__(key)
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except AttributeError:
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raise KeyError()
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def __setattr__(self, key, value):
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pylons_key = to_pylons(key)
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config[pylons_key] = value
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def __setitem__(self, key, value):
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self.__setattr__(key, value)
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def type_converter(self, value):
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#cast to int
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if value.isdigit():
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return int(value)
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#cast to bool
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if value.lower() in ['true', 'false']:
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return value.lower() == 'true'
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return value
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class PylonsLoader(BaseLoader):
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"""Pylons celery loader
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Maps the celery config onto pylons.config
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"""
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def read_configuration(self):
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self.configured = True
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return PylonsSettingsProxy()
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def on_worker_init(self):
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"""
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Import task modules.
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"""
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self.import_default_modules()
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