/
server.go
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/
server.go
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// Copyright 2019 The Operator-SDK Authors
//
// 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 kubemetrics
import (
"fmt"
"net"
"net/http"
metricsstore "k8s.io/kube-state-metrics/pkg/metrics_store"
)
const (
metricsPath = "/metrics"
healthzPath = "/healthz"
)
func ServeMetrics(stores [][]*metricsstore.MetricsStore, host string, port int32) {
listenAddress := net.JoinHostPort(host, fmt.Sprint(port))
mux := http.NewServeMux()
// Add metricsPath
mux.Handle(metricsPath, &metricHandler{stores})
// Add healthzPath
mux.HandleFunc(healthzPath, func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(200)
if _, err := w.Write([]byte("ok")); err != nil {
log.Error(err, "Unable to write to serve custom metrics")
}
})
// Add index
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
_, err := w.Write([]byte(`<html>
<head><title>Operator SDK Metrics</title></head>
<body>
<h1>kube-metrics</h1>
<ul>
<li><a href='` + metricsPath + `'>metrics</a></li>
<li><a href='` + healthzPath + `'>healthz</a></li>
</ul>
</body>
</html>`))
if err != nil {
log.Error(err, "Unable to write to serve custom metrics")
}
})
err := http.ListenAndServe(listenAddress, mux)
log.Error(err, "Failed to serve custom metrics")
}
type metricHandler struct {
stores [][]*metricsstore.MetricsStore
}
func (m *metricHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
resHeader := w.Header()
// 0.0.4 is the exposition format version of prometheus
// https://prometheus.io/docs/instrumenting/exposition_formats/#text-based-format
resHeader.Set("Content-Type", `text/plain; version=`+"0.0.4")
for _, stores := range m.stores {
for _, s := range stores {
s.WriteAll(w)
}
}
}