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# Copyright 2015-2019 Prometheus Python Client Developers
# Copyright 2019 Matrix.org Foundation C.I.C.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from prometheus_client import REGISTRY, CollectorRegistry, generate_latest
from twisted.web.resource import Resource
from twisted.web.server import Request
CONTENT_TYPE_LATEST = "text/plain; version=0.0.4; charset=utf-8"
class MetricsResource(Resource):
"""
Twisted ``Resource`` that serves prometheus metrics.
"""
isLeaf = True
def __init__(self, registry: CollectorRegistry = REGISTRY):
self.registry = registry
def render_GET(self, request: Request) -> bytes:
request.setHeader(b"Content-Type", CONTENT_TYPE_LATEST.encode("ascii"))
response = generate_latest(self.registry)
request.setHeader(b"Content-Length", str(len(response)))
return response
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