/
kubernetes.go
146 lines (127 loc) · 3.36 KB
/
kubernetes.go
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package discovery
import (
"context"
"log"
"time"
"github.com/bingoohuang/braft/util"
"github.com/bingoohuang/gg/pkg/randx"
"github.com/bingoohuang/gg/pkg/ss"
core "k8s.io/api/core/v1"
meta "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
)
type kubernetesDiscovery struct {
serviceLabels map[string]string
discoveryChan chan string
stopChan chan bool
clientSet *kubernetes.Clientset
namespace string
portName string
}
func NewKubernetesDiscovery(namespace, portName string, serviceLabels map[string]string) Discovery {
return &kubernetesDiscovery{
namespace: namespace,
serviceLabels: serviceLabels,
portName: portName,
discoveryChan: make(chan string),
stopChan: make(chan bool),
}
}
// Name gives the name of the discovery.
func (k *kubernetesDiscovery) Name() string {
return "k8s://ns=" + k.namespace +
"/labels=" + ss.JoinMap(k.serviceLabels, "=", ",") +
"/portName=" + k.portName
}
func (k *kubernetesDiscovery) Start(_ string, _ int) (chan string, error) {
util.Think(ss.Or(util.Env("K8S_SLEEP"), "15-30s"))
cc, err := rest.InClusterConfig()
if err != nil {
return nil, err
}
if k.clientSet, err = kubernetes.NewForConfig(cc); err != nil {
return nil, err
}
// do a search at first.
k.search(true)
go k.discovery()
return k.discoveryChan, nil
}
func (k *kubernetesDiscovery) discovery() {
for {
select {
case <-k.stopChan:
k.stopChan <- true
return
case <-time.After(time.Duration(randx.IntBetween(1, 6)) * time.Second):
k.search(false)
}
}
}
func (k *kubernetesDiscovery) search(gorun bool) {
result, err := k.Search()
if err != nil {
log.Printf("search k8s error: %v", err)
}
f := func() {
for _, item := range result {
k.discoveryChan <- item
}
}
if gorun {
go f()
} else {
f()
}
}
func (k *kubernetesDiscovery) Search() (dest []string, err error) {
log.Printf("[L:1m] search services with namespace: %s, labels: %v", k.namespace, k.serviceLabels)
start := time.Now()
defer log.Printf("[L:1m] search completed with cost %s", time.Since(start))
services, err := k.clientSet.CoreV1().Services(k.namespace).List(context.Background(),
meta.ListOptions{
LabelSelector: labels.SelectorFromSet(k.serviceLabels).String(),
Watch: false,
})
if err != nil {
log.Printf("search services error: %v", err)
return nil, err
}
for _, svc := range services.Items {
set := labels.Set(svc.Spec.Selector)
listOptions := meta.ListOptions{
LabelSelector: labels.SelectorFromSet(set).String(),
}
pods, err := k.clientSet.CoreV1().Pods(svc.Namespace).List(context.Background(), listOptions)
if err != nil {
return dest, err
}
for _, pod := range pods.Items {
if pod.Status.Phase == core.PodRunning {
podIp := pod.Status.PodIP
log.Printf("[L:1m] pod phase: %s, pod iP: %s", pod.Status.Phase, podIp)
if p := k.findPort(pod); p.ContainerPort > 0 {
dest = append(dest, podIp)
}
}
}
}
return dest, nil
}
func (k *kubernetesDiscovery) findPort(pod core.Pod) (p core.ContainerPort) {
for _, container := range pod.Spec.Containers {
for _, port := range container.Ports {
log.Printf("[L:1m] port: %+v", port)
if k.portName == "" || port.Name == k.portName {
return port
}
}
}
return p
}
func (k *kubernetesDiscovery) Stop() {
k.stopChan <- true
<-k.stopChan
}