背景：

完成了client-go gin的简单整合七-继续完善，准备整合一下前面的代码（当然了关于上一节的坑还是先留着……没有想好怎么搞：https://www.yuque.com/duiniwukenaihe/hg6ymd/ipd4bf#R0XxW）。这里以service为例也实现一下list watch……

list watch实现service list:

模仿/src/core/deployment_int.go写一个/src/core/service_int.go:

/src/core/service_int.go

package core
import (
    "fmt"
    corev1 "k8s.io/api/core/v1"
    "log"
    "sync"
)
type ServiceMap struct {
    data sync.Map
}
func (svcmap *ServiceMap) Add(dep *corev1.Service) {
    if list, ok := svcmap.data.Load(dep.Namespace); ok {
        list = append(list.([]*corev1.Service), dep)
        svcmap.data.Store(dep.Namespace, list)
    } else {
        svcmap.data.Store(dep.Namespace, []*corev1.Service{dep})
    }
}
func (svcmap *ServiceMap) Update(dep *corev1.Service) error {
    if list, ok := svcmap.data.Load(dep.Namespace); ok {
        for i, range_dep := range list.([]*corev1.Service) {
            if range_dep.Name == dep.Name {
                list.([]*corev1.Service)[i] = dep
                svcmap.data.Store(dep.Namespace, list)
            }
        }
        return nil
    }
    return fmt.Errorf("Service-%s not found", dep.Name)
}
// 删除
func (svcmap *ServiceMap) Delete(dep *corev1.Service) {
    if list, ok := svcmap.data.Load(dep.Namespace); ok {
        for i, range_dep := range list.([]*corev1.Service) {
            if range_dep.Name == dep.Name {
                newList := append(list.([]*corev1.Service)[:i], list.([]*corev1.Service)[i+1:]...)
                svcmap.data.Store(dep.Namespace, newList)
                break
            }
        }
    }
}
func (svcmap *ServiceMap) ListByNS(ns string) ([]*corev1.Service, error) {
    if list, ok := svcmap.data.Load(ns); ok {
        return list.([]*corev1.Service), nil
    }
    return nil, fmt.Errorf("record not found")
}
func (svcmap *ServiceMap) GetService(ns string, name string) (*corev1.Service, error) {
    depList, err := svcmap.ListByNS(ns)
    if err != nil {
        return nil, fmt.Errorf("Service not found")
    }
    for _, item := range depList {
        if item.Name == name {
            return item, nil
        }
    }
    return nil, fmt.Errorf("Service not found")
}
var svcmap *ServiceMap
func init() {
    svcmap = &ServiceMap{}
}
type SvcHandler struct {
}
func (d *SvcHandler) OnAdd(obj interface{}) {
    //fmt.Println(obj.(*corev1.Service).Name)
    svcmap.Add(obj.(*corev1.Service))
}
func (d *SvcHandler) OnUpdate(oldObj, newObj interface{}) {
    err := svcmap.Update(newObj.(*corev1.Service))
    if err != nil {
        log.Println(err)
    }
}
func (d *SvcHandler) OnDelete(obj interface{}) {
    if d, ok := obj.(*corev1.Service); ok {
        svcmap.Delete(d)
    }
}

Int

/src/core/deployment_init.go Init中增加ServiceInformer相关配置：

func InitDeployment() {
    factory := informers.NewSharedInformerFactory(lib.K8sClient, 0)
    depinformer := factory.Apps().V1().Deployments()
    depinformer.Informer().AddEventHandler(&DepHandler{})
    Podinformer := factory.Core().V1().Pods()
    Podinformer.Informer().AddEventHandler(&PodHandler{})
    Rsinformer := factory.Apps().V1().ReplicaSets()
    Rsinformer.Informer().AddEventHandler(&RSHandler{})
    eventInformer := factory.Core().V1().Events()
    eventInformer.Informer().AddEventHandler(&EventHandler{})
    ServiceInformer := factory.Core().V1().Services()
    ServiceInformer.Informer().AddEventHandler(&SvcHandler{})
    factory.Start(wait.NeverStop)
}

注意：只截取了相关配置，没有复制整个文件！

修改Service.go为list watch模式

/src/service/Service.go not list-watch原代码：

package service

import (
    "context"
    "github.com/gin-gonic/gin"
    . "k8s-demo1/src/lib"
    metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

type Service struct {
    Name       string
    Type       string
    ClusterIp  string
    ExternalIp []string
    Ports      []string
    Select     map[string]string
}

func ListService(g *gin.Context) {
    ns := g.Query("ns")
    svc, err := K8sClient.CoreV1().Services(ns).List(context.Background(), metav1.ListOptions{})
    if err != nil {
        g.Error(err)
        return
    }
    ret := make([]*Service, 0)
    for _, item := range svc.Items {
        ret = append(ret, &Service{
            Name:       item.Name,
            Type:       string(item.Spec.Type),
            ClusterIp:  item.Spec.ClusterIP,
            ExternalIp: item.Spec.ExternalIPs,
            Select:     item.Spec.Selector,
        })

    }
    g.JSON(200, ret)
    return
}

修改成list watch方式：

package service

import (
    "github.com/gin-gonic/gin"
    "k8s-demo1/src/core"
    corev1 "k8s.io/api/core/v1"
)

type Service struct {
    Name       string
    Type       string
    ClusterIp  string
    ExternalIp []string
    Ports      []corev1.ServicePort
    Select     map[string]string
}

func ListService(g *gin.Context) {
    ns := g.Query("ns")
    //svc, err := K8sClient.CoreV1().Services(ns).List(context.Background(), metav1.ListOptions{})
    svclist, _ := core.SVCMap.ListByNS(ns)
    ret := make([]*Service, 0)
    for _, item := range svclist {
        ret = append(ret, &Service{
            Name:       item.Name,
            Type:       string(item.Spec.Type),
            ClusterIp:  item.Spec.ClusterIP,
            ExternalIp: item.Spec.ExternalIPs,
            Ports:      item.Spec.Ports,
            Select:     item.Spec.Selector,
        })

    }
    g.JSON(200, ret)
    return
}

运行main.go

package main

import (
    "github.com/gin-gonic/gin"
    "k8s-demo1/src/core"
    "k8s-demo1/src/service"
)

func main() {
    r := gin.Default()
    r.GET("/", func(context *gin.Context) {
        context.JSON(200, "hello")
    })
    r.GET("/namespaces", service.ListNamespace)
    r.GET("/deployments", service.ListDeployment)
    r.GET("/service", service.ListService)
    r.GET("pods", service.ListallPod)
    core.InitDeployment()
    r.Run()
}

做一个svc

[zhangpeng@zhangpeng k8s]$ cat nginx1-deployment.yaml 
apiVersion: v1
kind: Service
metadata:
  name: nginx1
  labels:
    app: nginx
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: nginx
[zhangpeng@zhangpeng k8s]$ kubectl apply -f  nginx1-deployment.yaml 
service/nginx1 created
[zhangpeng@zhangpeng k8s]$ kubectl get svc
NAME         TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)   AGE
kubernetes   ClusterIP   10.96.0.1      <none>        443/TCP   47d
nginx1       ClusterIP   10.111.134.5   <none>        80/TCP    48s

注：访问 svc就免了，我这里肯定会有问题的。我的app label都是nginx。所以我不能精确指定到deployment1的（我的初衷），所以尽量是app label去区分deployment！。随便修改一下nginx中index.html就发现他都会调度的几个deployments。所以我前面整deployment的时候也是一种耍流氓了…不过我还是想区分一下搞出来！

总结：

list watch 就实现一个service了 statefulset configmap 其他的最后实现吧,curd先实现一下简单的
deployment 的坑还是先留着……
下面继续准备实现一下create delete update的方法……

kubernetes and client-go

client-go gin的简单整合八Service-list初步收尾

背景：

list watch实现service list:

/src/core/service_int.go

Int

修改Service.go为list watch模式

运行main.go

总结：