76 lines
1.9 KiB
Python
76 lines
1.9 KiB
Python
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import sys
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import eventlet
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import contexter
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import six
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class Task(object):
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@classmethod
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def get_or_create(cls, signal, kwargs=None, logger=None):
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if not hasattr(cls, '_registry'):
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cls._registry = []
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task = cls(signal, kwargs, logger=logger)
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if task not in cls._registry:
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cls._registry.append(task)
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return cls._registry[cls._registry.index(task)]
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def __init__(self, signal, kwargs=None, logger=None):
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self.signal = signal
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self.kwargs = kwargs or {}
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self.logger = logger
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self.failures = 0
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self.task_semaphore = eventlet.semaphore.BoundedSemaphore(1)
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def __call__(self, semaphores=None):
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semaphores = semaphores or []
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with contexter.Contexter(self.task_semaphore, *semaphores):
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result = self._do()
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if result:
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self.failures = 0
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else:
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self.failures += 1
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return result
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def _do(self):
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try:
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self._emit()
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except Exception:
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self._exception(*sys.exc_info())
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return False
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else:
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self._completed()
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return True
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finally:
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self._clean()
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def _clean(self):
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pass
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def _completed(self):
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if self.logger:
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self.logger.info('[%s] Completed' % self)
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def _exception(self, e_type, e_value, e_traceback):
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if self.logger:
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self.logger.exception('[%s] Raised exception: %s' % (
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self, e_value))
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else:
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six.reraise(e_type, e_value, e_traceback)
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def _emit(self):
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if self.logger:
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self.logger.info('[%s] Running' % self)
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self.signal.emit(**self.kwargs)
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def __eq__(self, other):
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return (self.signal == other.signal and self.kwargs == other.kwargs)
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def __str__(self):
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return '%s: %s' % (self.signal.__class__.__name__, self.kwargs)
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