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from unittest import skipUnless
from prometheus_client import CollectorRegistry, Counter, generate_latest
try:
from warnings import filterwarnings
from twisted.internet import reactor
from twisted.trial.unittest import TestCase
from twisted.web.client import Agent, readBody
from twisted.web.resource import Resource
from twisted.web.server import Site
from prometheus_client.twisted import MetricsResource
HAVE_TWISTED = True
except ImportError:
from unittest import TestCase
HAVE_TWISTED = False
class MetricsResourceTest(TestCase):
@skipUnless(HAVE_TWISTED, "Don't have twisted installed.")
def setUp(self):
self.registry = CollectorRegistry()
def test_reports_metrics(self):
"""
``MetricsResource`` serves the metrics from the provided registry.
"""
c = Counter('cc', 'A counter', registry=self.registry)
c.inc()
root = Resource()
root.putChild(b'metrics', MetricsResource(registry=self.registry))
server = reactor.listenTCP(0, Site(root))
self.addCleanup(server.stopListening)
agent = Agent(reactor)
port = server.getHost().port
url = f"http://localhost:{port}/metrics"
d = agent.request(b"GET", url.encode("ascii"))
# Ignore expected DeprecationWarning.
filterwarnings("ignore", category=DeprecationWarning, message="Using readBody "
"with a transport that does not have an abortConnection method")
d.addCallback(readBody)
d.addCallback(self.assertEqual, generate_latest(self.registry))
return d
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