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metrics.go
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/
metrics.go
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// Copyright 2018 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 sdk
import (
"context"
"net/http"
"strconv"
"github.com/operator-framework/operator-sdk/pkg/k8sutil"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/sirupsen/logrus"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/client/config"
)
// ExposeMetricsPort generate a Kubernetes Service to expose metrics port
func ExposeMetricsPort() *v1.Service {
http.Handle("/"+k8sutil.PrometheusMetricsPortName, promhttp.Handler())
go http.ListenAndServe(":"+strconv.Itoa(k8sutil.PrometheusMetricsPort), nil)
service, err := k8sutil.InitOperatorService()
if err != nil {
logrus.Errorf("failed to initialize service object for operator metrics: %v", err)
return nil
}
kubeconfig, err := config.GetConfig()
if err != nil {
panic(err)
}
runtimeClient, err := client.New(kubeconfig, client.Options{})
if err != nil {
panic(err)
}
err = runtimeClient.Create(context.TODO(), service)
if err != nil && !errors.IsAlreadyExists(err) {
logrus.Errorf("failed to create service for operator metrics: %v", err)
return nil
}
logrus.Infof("Metrics service %s created", service.Name)
return service
}