// Copyright 2019-2020 Authors of Cilium
//
// 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.

package metrics

import (
	"log"
	"net/http"

	operatorOption "github.com/cilium/cilium/operator/option"

	"github.com/prometheus/client_golang/prometheus"
	"github.com/prometheus/client_golang/prometheus/promhttp"
)

const Namespace = "cilium_operator"

var (
	Registry *prometheus.Registry
)

func Register() {
	Registry = prometheus.NewPedanticRegistry()
	Registry.MustRegister(prometheus.NewProcessCollector(prometheus.ProcessCollectorOpts{Namespace: Namespace}))
	go func() {
		// The Handler function provides a default handler to expose metrics
		// via an HTTP server. "/metrics" is the usual endpoint for that.
		http.Handle("/metrics", promhttp.HandlerFor(Registry, promhttp.HandlerOpts{}))
		log.Fatal(http.ListenAndServe(operatorOption.Config.OperatorPrometheusServeAddr, nil))
	}()
}