mirror of
https://github.com/sprockets/sprockets.handlers.heartbeat.git
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45 lines
1.1 KiB
Python
45 lines
1.1 KiB
Python
"""
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handlers.heartbeat
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A callback-based heartbeat handler
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"""
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import logging
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from tornado.web import RequestHandler
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version_info = (0, 1, 0)
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__version__ = '.'.join(str(v) for v in version_info)
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callbacks = []
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class HeartbeatHandler(RequestHandler):
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"""Heartbeat handler to determine if a service is healthy."""
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def get(self):
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"""Respond with the health of our service."""
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if not all(callback() for callback in callbacks):
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self.set_status(500)
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self.write()
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self.set_status(204)
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def _log(self):
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"""Override Tornado to not log 204's from heartbeat."""
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if self.get_status() != 204:
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super(HeartbeatHandler, self)._log()
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def register_callback(callable_):
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"""Register a callable to be checked during heartbeat.
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This function adds a new heartbeat callback, which can be any
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callable that returns ``True`` if healthy, and ``False`` if
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it detects a problem. Any ``False`` return value will cause
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a call to the ``HeartbeatHandler`` to return a ``500``.
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"""
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callbacks.append(callable_)
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logging.info('Callback %s registered', callable_.__name__)
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