client-go gin的简单整合三（list列表相关再进阶关于Pods）

Posted 2022-06-21 saynaihe

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背景：

紧接client-go gin的简单整合二（list列表相关进一步操作）,namespace deployment service 都list列表展现了，总觉得还少点什么？比如显示集群中所有运行的pod列表？根据namespace显示pod列表？按照deployment名称查询所包含的pod？总而言之这一部分就围绕着pod列表的展现展开了！

client-go gin的简单整合二（list列表相关再进阶）

1. 展现命名空间的pod相关信息

先确认一下需要获取的信息：
kubectl get pods -o wide

[root@zhangpeng ~]# kubectl get pods -o wide
NAME                     READY   STATUS    RESTARTS   AGE     IP          NODE                       NOMINATED NODE   READINESS GATES
nginx-7b5d9df6b8-dsx8j   1/1     Running   0          5d19h   10.31.0.4   cn-beijing.172.25.84.228   <none>           <none>

name status restarts ip node这几个肯定三要搞上的输出一下pod的yaml看还有什么要输出的

[root@zhangpeng ~]# kubectl get pods nginx-7b5d9df6b8-dsx8j -o yaml

createtime lables image也添加一下！
基本copy了一下Namespace.go 里面func ListNamespace过来：
src/service/Pod.go

package service

import (
	"context"
	"github.com/gin-gonic/gin"
	. "k8s-demo1/src/lib"
package service

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

type Pod struct 
	Namespace  string
	Status     string
	Images     string
	NodeName   string
	CreateTime string
	Labels     map[string]string


func ListallPod(g *gin.Context) 
	ns := g.Query("ns")

	pods, err := K8sClient.CoreV1().Pods(ns).List(context.Background(), metav1.ListOptions)
	if err != nil 
		g.Error(err)
	
	ret := make([]*Pod, 0)
	for _, item := range pods.Items 

		ret = append(ret, &Pod
    	Namespace:  item.Namespace,
			Name:       item.Name,
			Status:     string(item.Status.Phase),
			Labels:     item.Labels,
			NodeName:   item.Spec.NodeName,
			Images:     item.Spec.Containers[0].Image,
			CreateTime: item.CreationTimestamp.Format("2006-01-02 15:04:05"),
		)

	
	g.JSON(200, ret)
	return

Status取了Phase的值应该是没有问题的吧？Images跟deployment取值一样。本来开始准备搞上restart的次数…但是kube-system下pod有异常输出就先忽略了！
main.go

package main

import (
	"github.com/gin-gonic/gin"
	"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)
	r.Run()

增加r.GET(“pods”, service.ListallPod)路由！运行main.go
http://127.0.0.1:8080/pods

http://127.0.0.1:8080/pods?ns=default

基本完成！

2. 按照deployment为条件显示对应pod列表

按照namespace命名空间区分排序pod列表还是很简单的,如何按照deployment 名字去显示pod列表呢？
这边是照抄的沈老师的课程，自己还没有转过弯来…

deployment是通过selector标签去匹配的pod labels，我就先那么理解了…
写一个方法GetPodsByDep根据namespace depoyment名称获取pod相关信息：
src/service/Deployment.go文件中：

func GetPodsByDep(ns string, dep *v1.Deployment) []*Pod 
	ctx := context.Background()
	listopt := metav1.ListOptions
		LabelSelector: GetLabels(dep.Spec.Selector.MatchLabels),
	
	list, err := K8sClient.CoreV1().Pods(ns).List(ctx, listopt)
	if err != nil 
		panic(err.Error())
	
	pods := make([]*Pod, len(list.Items))
	for i, pod := range list.Items 
		pods[i] = &Pod
			Namespace:  pod.Namespace,
			Name:       pod.Name, //获取 pod名称
			Status:     string(pod.Status.Phase),
			Images:     pod.Spec.Containers[0].Image,
			NodeName:   pod.Spec.NodeName, //所属节点
			Labels:     pod.Labels,
			CreateTime: pod.CreationTimestamp.Format("2006-01-02 15:04:05"), //创建时间
		
	

	return pods

src/service/Deployment.go最终如下：

package service

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

type Deployment struct 
	Namespace           string
	Name                string
	Replicas            int32
	AvailableReplicas   int32
	UnavailableReplicas int32
	Images              string
	CreateTime          string
	Labels              map[string]string
	Pods                []*Pod


func ListDeployment(g *gin.Context) 
	ns := g.Query("ns")

	dps, err := K8sClient.AppsV1().Deployments(ns).List(context.Background(), metav1.ListOptions)
	if err != nil 
		g.Error(err)
	
	ret := make([]*Deployment, 0)
	for _, item := range dps.Items 
		ret = append(ret, &Deployment
			Name:                item.Name,
			Replicas:            item.Status.Replicas,
			AvailableReplicas:   item.Status.AvailableReplicas,
			UnavailableReplicas: item.Status.UnavailableReplicas,
			Images:              item.Spec.Template.Spec.Containers[0].Image,
			Labels:              item.GetLabels(),
		)

	
	g.JSON(200, ret)
	return

func GetPodsByDep(ns string, dep *v1.Deployment) []*Pod 
	ctx := context.Background()
	listopt := metav1.ListOptions
		LabelSelector: GetLabels(dep.Spec.Selector.MatchLabels),
	
	list, err := K8sClient.CoreV1().Pods(ns).List(ctx, listopt)
	if err != nil 
		panic(err.Error())
	
	pods := make([]*Pod, len(list.Items))
	for i, pod := range list.Items 
		pods[i] = &Pod
			Namespace:  pod.Namespace,
			Name:       pod.Name, //获取 pod名称
			Status:     string(pod.Status.Phase),
			Images:     pod.Spec.Containers[0].Image,
			NodeName:   pod.Spec.NodeName, //所属节点
			Labels:     pod.Labels,
			CreateTime: pod.CreationTimestamp.Format("2006-01-02 15:04:05"), //创建时间
		
	

	return pods


func GetDeployment(g *gin.Context) 
	ns := g.Query("ns")
	name := g.Query("name")
	ctx := context.Background()
	getopt := metav1.GetOptions
	dps, err := K8sClient.AppsV1().Deployments(ns).Get(ctx, name, getopt)
	if err != nil 
		g.Error(err)
	
	ret := make([]*Deployment, 0)
	ret = append(ret, &Deployment
		Namespace:           dps.Namespace,
		Name:                dps.Name,
		Replicas:            dps.Status.Replicas,
		AvailableReplicas:   dps.Status.AvailableReplicas,
		UnavailableReplicas: dps.Status.UnavailableReplicas,
		Images:              dps.Spec.Template.Spec.Containers[0].Image,
		CreateTime:          dps.CreationTimestamp.Format("2006-01-02 15:03:04"),
		Labels:              dps.Labels,
		Pods:                GetPodsByDep(ns, dps),
	)
	g.JSON(200, ret)
	return

main.go如下：

package main

import (
	"github.com/gin-gonic/gin"
	"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("/deployment", service.GetDeployment)
	r.GET("pods", service.ListallPod)
	r.Run()

运行 main.go
http://127.0.0.1:8080/deployment?ns=default&name=nginx

后记：

GetPodsByDep还是有点懵
指针还是迷惑
map啥的数据格式啥的还是蒙懵阿…
这一周好好消化一下list…
后面貌似还有informer? list watch机制啥的…一步一步来吧！
最近工作有点杂，更新会慢一些。但是会持续更新ing…

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