/
master_args.go
92 lines (82 loc) · 2.26 KB
/
master_args.go
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package main
import (
"context"
"github.com/pkg/errors"
core "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/pager"
)
func extractMasterArgs(cfg *rest.Config, kc kubernetes.Interface, info *ClusterInfo) error {
pods, err := findMasterPods(kc)
if err != nil {
return err
}
var errs []error
for _, pod := range pods {
if c, err := processPod(cfg, pod); err != nil {
errs = append(errs, err)
} else {
info.APIServers = append(info.APIServers, *c)
}
}
return utilerrors.NewAggregate(errs)
}
func findMasterPods(kc kubernetes.Interface) ([]core.Pod, error) {
pods, err := findMasterPodsByLabel(kc)
if err != nil {
return nil, err
}
if len(pods) > 0 {
return pods, nil
}
return findMasterPodsByKubernetesService(kc)
}
func findMasterPodsByLabel(kc kubernetes.Interface) ([]core.Pod, error) {
pods, err := kc.CoreV1().Pods(metav1.NamespaceSystem).List(metav1.ListOptions{
LabelSelector: labels.SelectorFromSet(labels.Set{
"component": "kube-apiserver",
}).String(),
})
if err != nil {
return nil, err
}
return pods.Items, nil
}
func findMasterPodsByKubernetesService(kc kubernetes.Interface) ([]core.Pod, error) {
ep, err := kc.CoreV1().Endpoints(core.NamespaceDefault).Get("kubernetes", metav1.GetOptions{})
if err != nil {
return nil, err
}
podIPs := sets.NewString()
for _, subnet := range ep.Subsets {
for _, addr := range subnet.Addresses {
podIPs.Insert(addr.IP)
}
}
lister := pager.New(func(ctx context.Context, opts metav1.ListOptions) (runtime.Object, error) {
return kc.CoreV1().Pods(metav1.NamespaceSystem).List(opts)
})
objects, err := lister.List(context.Background(), metav1.ListOptions{})
if err != nil {
return nil, err
}
pods := make([]core.Pod, 0, podIPs.Len())
err = meta.EachListItem(objects, func(obj runtime.Object) error {
pod, ok := obj.(*core.Pod)
if !ok {
return errors.Errorf("%v is not a pod", obj)
}
if podIPs.Has(pod.Status.PodIP) {
pods = append(pods, *pod)
}
return nil
})
return pods, err
}