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metrics.go
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/
metrics.go
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/*-
* Copyright (c) 2019-2021, F5 Networks, Inc.
*
* 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 controller
import (
"context"
bigIPPrometheus "github.com/F5Networks/k8s-bigip-ctlr/v3/pkg/prometheus"
log "github.com/F5Networks/k8s-bigip-ctlr/v3/pkg/vlogger"
"github.com/prometheus/client_golang/prometheus/promhttp"
"net/http"
)
func (ctlr *Controller) enableHttpEndpoint(httpAddress string) {
// Expose Prometheus metrics
http.Handle("/metrics", promhttp.Handler())
bigIPPrometheus.RegisterMetrics(ctlr.RequestHandler.httpClientMetrics, ctlr.CMTokenManager.ServerURL)
// Expose cis health endpoint
http.Handle("/health", ctlr.CISHealthCheckHandler())
log.Fatal(http.ListenAndServe(httpAddress, nil).Error())
}
func (ctlr *Controller) CISHealthCheckHandler() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if ctlr.clientsets.kubeClient != nil {
var response string
// Check if kube-api server is reachable
_, err := ctlr.clientsets.kubeClient.Discovery().RESTClient().Get().AbsPath(clusterHealthPath).DoRaw(context.TODO())
if err != nil {
response = "kube-api server is not reachable."
}
// TODO Check if Central Manager is reachable
// Check if big-ip server is reachable
//_, _, _, err2 := ctlr.Agent.GetBigipAS3Version()
//if err2 != nil {
// response = response + "big-ip server is not reachable."
//}
// if err2 == nil && err == nil {
if err == nil {
w.WriteHeader(http.StatusOK)
w.Write([]byte("Ok"))
} else {
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(response))
}
}
})
}