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#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# See the GNU Affero General Public License for more details:
# <https://www.gnu.org/licenses/agpl-3.0.html>.
#
# Originally licensed under the Apache License, Version 2.0:
# <http://www.apache.org/licenses/LICENSE-2.0>.
#
# [This file includes modifications made by New Vector Limited]
#
#
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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