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https://github.com/sprockets/sprockets.mixins.metrics.git
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70 lines
1.8 KiB
Python
70 lines
1.8 KiB
Python
import signal
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from sprockets.mixins import metrics
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from tornado import gen, ioloop, web
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class SimpleHandler(metrics.StatsdMixin, web.RequestHandler):
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"""
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Simply emits a timing metric around the method call.
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The metric namespace and StatsD endpoint are configured in
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the application settings object so there is nothing to do in
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a request handler.
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"""
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@gen.coroutine
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def prepare(self):
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maybe_future = super(SimpleHandler, self).prepare()
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if gen.is_future(maybe_future):
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yield maybe_future
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if 'Correlation-ID' in self.request.headers:
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self.set_metric_tag('correlation_id',
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self.request.headers['Correlation-ID'])
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@gen.coroutine
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def get(self):
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yield gen.sleep(0.25)
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self.set_status(204)
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self.finish()
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def post(self):
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"""Example of increasing a counter."""
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self.increase_counter('request', 'path')
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self.set_status(204)
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def _sig_handler(*args_):
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iol = ioloop.IOLoop.instance()
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iol.add_callback_from_signal(iol.stop)
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def make_application():
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"""
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Create a application configured to send metrics.
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Metrics will be sent to localhost:8125 namespaced with
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``webapps``. Run netcat or a similar listener then run this
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example. HTTP GETs will result in a metric like::
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webapps.SimpleHandler.GET.204:255.24497032165527|ms
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"""
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settings = {
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metrics.StatsdMixin.SETTINGS_KEY: {
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'namespace': 'webapps',
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'host': '127.0.0.1',
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'port': 8125,
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}
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}
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return web.Application([web.url('/', SimpleHandler)], **settings)
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if __name__ == '__main__':
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app = make_application()
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app.listen(8000)
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signal.signal(signal.SIGINT, _sig_handler)
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signal.signal(signal.SIGTERM, _sig_handler)
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ioloop.IOLoop.instance().start()
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