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main.go
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main.go
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// Copyright 2019-2023 The Liqo 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 main
import (
"context"
"flag"
"fmt"
"net/http"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/selection"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/client-go/kubernetes"
clientgoscheme "k8s.io/client-go/kubernetes/scheme"
"k8s.io/klog/v2"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/cache"
"github.com/liqotech/liqo/pkg/consts"
"github.com/liqotech/liqo/pkg/remotemetrics"
clientutils "github.com/liqotech/liqo/pkg/utils/clients"
"github.com/liqotech/liqo/pkg/utils/mapper"
"github.com/liqotech/liqo/pkg/utils/restcfg"
)
// cluster-role
// +kubebuilder:rbac:groups=core,resources=nodes;pods;namespaces,verbs=get;list;watch
// +kubebuilder:rbac:groups=core,resources=nodes/proxy,verbs=get
func main() {
ctx := context.Background()
keyPath := flag.String("key-path", "server.key", "Path to the key file")
certPath := flag.String("cert-path", "server.crt", "Path to the certificate file")
port := flag.Int("port", 8443, "Port to listen on")
klog.InitFlags(nil)
restcfg.InitFlags(nil)
flag.Parse()
config := restcfg.SetRateLimiter(ctrl.GetConfigOrDie())
kcl := kubernetes.NewForConfigOrDie(config)
scheme := runtime.NewScheme()
_ = clientgoscheme.AddToScheme(scheme)
liqoMapper, err := (mapper.LiqoMapperProvider(scheme))(config)
if err != nil {
klog.Fatalf("mapper: %s", err)
}
podsLabelRequirement, err := labels.NewRequirement(consts.ManagedByLabelKey,
selection.Equals, []string{consts.ManagedByShadowPodValue})
utilruntime.Must(err)
clientCache, err := cache.New(config, cache.Options{
Scheme: scheme,
Mapper: liqoMapper,
SelectorsByObject: cache.SelectorsByObject{
&corev1.Pod{}: {
Label: labels.NewSelector().Add(*podsLabelRequirement),
},
},
})
if err != nil {
klog.Fatalf("error creating cache: %s", err)
}
cl, err := clientutils.GetCachedClientWithConfig(ctx, scheme, config, clientCache)
if err != nil {
klog.Fatal(err)
}
router, err := remotemetrics.GetHTTPHandler(kcl.RESTClient(), cl)
if err != nil {
klog.Fatal(err)
}
err = http.ListenAndServeTLS(fmt.Sprintf(":%d", *port), *certPath, *keyPath, router)
if err != nil {
klog.Fatal("ListenAndServe: ", err)
}
}