test_prometheus.py

#!/usr/bin/env nix-shell
#! nix-shell -i python -p pythonPackages.twisted pythonPackages.prometheus_client

from twisted.internet.task import deferLater, react
from twisted.web.server import Site
from twisted.web.resource import Resource

from prometheus_client.twisted import MetricsResource

def main(reactor):
    root = Resource()
    root.putChild(b'metrics', MetricsResource())

    factory = Site(root)
    port = reactor.listenTCP(8000, factory)
    print "Listening on port", port.getHost()
    return deferLater(reactor, 3600, port.stopListening)

react(main)