Simple integration of client go gin six list watch two (about the improvement of RS, pod and deployment)

background ：

The front is finished client-go gin Simple integration of five -list-watch deployment application , Go one step further Rs Pod It also realizes list-watch!
Less written before ：

/src/core/deployment_init.go

// to update 
func (depmap *DeploymentMap) Update(dep *v1.Deployment) error {
	if list, ok := depmap.data.Load(dep.Namespace); ok {
		for i, range_dep := range list.([]*v1.Deployment) {
			if range_dep.Name == dep.Name {
				list.([]*v1.Deployment)[i] = dep
				depmap.data.Store(dep.Namespace, list)
			}
		}
		return nil
	}
	return fmt.Errorf("deployment-%s not found", dep.Name)
}

Forget the Store data …depmap.data.Store(dep.Namespace, list)！

client-go gin Simple integration of six -list-watch Two （ About Rs And Pod）

About Rs list-watch

/src/core/rs_init.go

package core

import (
	"errors"
	"fmt"
	v1 "k8s.io/api/apps/v1"
	"log"
	"sync"
)

type RSMapStruct struct {
	Data sync.Map
}

func (rsmap *RSMapStruct) Add(rs *v1.ReplicaSet) {
	key := rs.Namespace
	if value, ok := rsmap.Data.Load(key); ok {
		value = append(value.([]*v1.ReplicaSet), rs)
		rsmap.Data.Store(key, value)
	} else {
		rsmap.Data.Store(key, []*v1.ReplicaSet{rs})
	}
}
func (rsmap *RSMapStruct) Update(rs *v1.ReplicaSet) error {
	key := rs.Namespace
	if value, ok := rsmap.Data.Load(key); ok {
		for index, r := range value.([]*v1.ReplicaSet) {
			if r.Name == rs.Name {
				value.([]*v1.ReplicaSet)[index] = rs
				rsmap.Data.Store(key, value)
				return nil
			}
		}
	}

	return fmt.Errorf("rs-%s not found", rs.Name)
}

func (rsmap *RSMapStruct) Delete(rs *v1.ReplicaSet) {
	key := rs.Namespace
	if value, ok := rsmap.Data.Load(key); ok {
		for index, r := range value.([]*v1.ReplicaSet) {
			if r.Name == rs.Name {
				value = append(value.([]*v1.ReplicaSet)[0:index], value.([]*v1.ReplicaSet)[index+1:]...)
				rsmap.Data.Store(key, value)
				return
			}
		}
	}
}

func (rsmap *RSMapStruct) ListByNS(ns string) ([]*v1.ReplicaSet, error) {
	if list, ok := rsmap.Data.Load(ns); ok {
		return list.([]*v1.ReplicaSet), nil
	}
	return nil, errors.New("rs record not found")
}

func (rsmap *RSMapStruct) GetRsLabelsByDeployment(deploy *v1.Deployment) ([]map[string]string, error) {
	rs, err := rsmap.ListByNS(deploy.Namespace)
	if err != nil {
		return nil, err
	}
	ret := make([]map[string]string, 0)
	for _, item := range rs {
		//if item.Annotations["deployment.kubernetes.io/revision"] != deploy.Annotations["deployment.kubernetes.io/revision"] {
		//	continue
		//}
		for _, v := range item.OwnerReferences {
			if v.Name == deploy.Name {
				ret = append(ret, item.Labels)
				break
			}
		}
	}
	return ret, nil
}

type RSHandler struct {
}

func (rsmap *RSHandler) OnAdd(obj interface{}) {
	RSMap.Add(obj.(*v1.ReplicaSet))
}
func (rsmap *RSHandler) OnUpdate(oldObj interface{}, newObj interface{}) {
	err := RSMap.Update(newObj.(*v1.ReplicaSet))
	if err != nil {
		log.Println(err)
	}
}
func (rsmap *RSHandler) OnDelete(obj interface{}) {
	RSMap.Delete(obj.(*v1.ReplicaSet))
}

var RSMap *RSMapStruct

func init() {
	RSMap = &RSMapStruct{}
}

About Pod list-watch

Write a first util Method ( Just to judge two label Are they the same? ！)：
/src/core/Util.go

func IsValidLabel(m1, m2 map[string]string) bool {
	for key := range m2 {
		if m2[key] != m1[key] {
			return false
		}
	}

	return true
}

basic copy since deployment_init.go:
/src/core/pod_int.go

package core

import (
	"fmt"
	corev1 "k8s.io/api/core/v1"
	"log"
	"sync"
)

type PodMapStruct struct {
	data sync.Map
}

func (podmap *PodMapStruct) Add(pod *corev1.Pod) {
	key := pod.Namespace
	if value, ok := podmap.data.Load(key); ok {
		value = append(value.([]*corev1.Pod), pod)
		podmap.data.Store(key, value)
	} else {
		podmap.data.Store(key, []*corev1.Pod{pod})
	}
}
func (podmap *PodMapStruct) Update(pod *corev1.Pod) error {
	key := pod.Namespace
	if value, ok := podmap.data.Load(key); ok {

		for index, p := range value.([]*corev1.Pod) {
			if p.Name == pod.Name {
				value.([]*corev1.Pod)[index] = pod
				podmap.data.Store(key, value)
				return nil
			}
		}
	}

	return fmt.Errorf("pod-%s not found", pod.Name)
}
func (podmap *PodMapStruct) Delete(pod *corev1.Pod) {
	key := pod.Namespace
	if value, ok := podmap.data.Load(key); ok {
		for index, p := range value.([]*corev1.Pod) {
			if p.Name == pod.Name {
				value = append(value.([]*corev1.Pod)[0:index], value.([]*corev1.Pod)[index+1:]...)
				podmap.data.Store(key, value)
				return
			}
		}
	}
}
func (podmap *PodMapStruct) ListByNS(ns string) ([]*corev1.Pod, error) {

	if ns != "" {
		if list, ok := podmap.data.Load(ns); ok {
			return list.([]*corev1.Pod), nil
		}
	}
	return nil, fmt.Errorf("pods not found")
}
func (podmap *PodMapStruct) ListByLabels(ns string, labels []map[string]string) ([]*corev1.Pod, error) {
	pods, err := podmap.ListByNS(ns)
	if err != nil {
		return nil, err
	}
	ret := make([]*corev1.Pod, 0)
	for _, pod := range pods {
		for _, label := range labels {
			if IsValidLabel(pod.Labels, label) {
				ret = append(ret, pod)
			}
		}
	}
	return ret, nil
}

type PodHandler struct {
}
var PodMap *PodMapStruct

func init() {
	PodMap = &PodMapStruct{}
}
func (podmap *PodHandler) OnAdd(obj interface{}) {
	PodMap.Add(obj.(*corev1.Pod))
}
func (podmap *PodHandler) OnUpdate(oldObj interface{}, newObj interface{}) {
	err := PodMap.Update(newObj.(*corev1.Pod))
	if err != nil {
		log.Println(err)
	}
}
func (podmap *PodHandler) OnDelete(obj interface{}) {
	PodMap.Delete(obj.(*corev1.Pod))
}

deployment informer AddEventHandler

/src/core/deployment_init.go

package core

import (
	"fmt"
	"k8s-demo1/src/lib"
	v1 "k8s.io/api/apps/v1"
	"k8s.io/apimachinery/pkg/util/wait"
	"k8s.io/client-go/informers"
	"log"
	"sync"
)

type DeploymentMap struct {
	data sync.Map
}

func (depmap *DeploymentMap) Add(dep *v1.Deployment) {
	if list, ok := depmap.data.Load(dep.Namespace); ok {
		list = append(list.([]*v1.Deployment), dep)
		depmap.data.Store(dep.Namespace, list)
	} else {
		depmap.data.Store(dep.Namespace, []*v1.Deployment{dep})
	}
}
func (depmap *DeploymentMap) Update(dep *v1.Deployment) error {
	if list, ok := depmap.data.Load(dep.Namespace); ok {
		for i, range_dep := range list.([]*v1.Deployment) {
			if range_dep.Name == dep.Name {
				list.([]*v1.Deployment)[i] = dep
			}
		}
		return nil
	}
	return fmt.Errorf("deployment-%s not found", dep.Name)
}

//  Delete 
func (depmap *DeploymentMap) Delete(dep *v1.Deployment) {
	if list, ok := depmap.data.Load(dep.Namespace); ok {
		for i, range_dep := range list.([]*v1.Deployment) {
			if range_dep.Name == dep.Name {
				newList := append(list.([]*v1.Deployment)[:i], list.([]*v1.Deployment)[i+1:]...)
				depmap.data.Store(dep.Namespace, newList)
				break
			}
		}
	}
}
func (depmap *DeploymentMap) ListByNS(ns string) ([]*v1.Deployment, error) {
	if list, ok := depmap.data.Load(ns); ok {
		return list.([]*v1.Deployment), nil
	}
	return nil, fmt.Errorf("record not found")
}

var DepMap *DeploymentMap

func init() {
	DepMap = &DeploymentMap{}
}

type DepHandler struct {
}

func (d *DepHandler) OnAdd(obj interface{}) {
	//fmt.Println(obj.(*v1.Deployment).Name)
	DepMap.Add(obj.(*v1.Deployment))
}
func (d *DepHandler) OnUpdate(oldObj, newObj interface{}) {
	err := DepMap.Update(newObj.(*v1.Deployment))
	if err != nil {
		log.Println(err)
	}
}
func (d *DepHandler) OnDelete(obj interface{}) {
	if d, ok := obj.(*v1.Deployment); ok {
		DepMap.Delete(d)
	}
}

func InitDeployment() {
	factory := informers.NewSharedInformerFactory(lib.K8sClient, 0)
	depinformer := factory.Apps().V1().Deployments()
	depinformer.Informer().AddEventHandler(&DepHandler{})
	podInformer := factory.Core().V1().Pods().Informer()
	podInformer.AddEventHandler(&PodHandler{})

	rsInformer := factory.Apps().V1().ReplicaSets().Informer()
	rsInformer.AddEventHandler(&RSHandler{})
	factory.Start(wait.NeverStop)
}

Pod.go

/src/service/Pod.go

package service

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

type Pod struct {
	Namespace  string
	Name       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{})
	pods, err := core.PodMap.ListByNS(ns)
	if err != nil {
		g.Error(err)
	}
	ret := make([]*Pod, 0)
	for _, item := range pods {

		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
}

deployment.go Modification of

deployment.go We need to revise it （ Last time I didn't put GetPodsByDep And other methods are modified as list-wath!）
/src/service/deployment.go：

package service

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

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")
	deplist, err := core.DepMap.ListByNS(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 deplist {
		ret = append(ret, &Deployment{
			Namespace:           item.Namespace,
			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(),
			Pods:                GetPodsByDep(ns, *item),
			CreateTime:          item.CreationTimestamp.Format("2006-01-02 15:03:04"),
		})

	}
	g.JSON(200, ret)
	return
}

func GetLabels(m map[string]string) string {
	labels := ""
	// aa=xxx,xxx=xx
	for k, v := range m {
		if labels != "" {
			labels += ","
		}
		labels += fmt.Sprintf("%s=%s", k, v)
	}
	return labels
}
func GetPodsByDep(ns string, dep v1.Deployment) []*Pod {
	rsLabelsMap, err := core.RSMap.GetRsLabelsByDeployment(&dep)
	if err != nil {
		log.Fatal(err)
	}
	pods, err := core.PodMap.ListByLabels(dep.Namespace, rsLabelsMap)
	if err != nil {
		log.Fatal(err)
	}
	ret := make([]*Pod, 0)
	for _, pod := range pods {
		ret = append(ret, &Pod{
			Name:       pod.Name,
			Namespace:  pod.Namespace,
			Images:     pod.Spec.Containers[0].Image,
			NodeName:   pod.Spec.NodeName,
			Labels:     pod.Labels,
			Status:     string(pod.Status.Phase),
			CreateTime: pod.CreationTimestamp.Format("2006-01-02 15:04:05"),
		})
	}
	return ret
}

function main.go

function main.go See if you can access pod list ？
http://127.0.0.1:8080/pods?ns=default

deployments Pit under …

function main.go I also took a look at it deployment If there is something wrong ：
http://127.0.0.1:8080/deployments?ns=default

what…deployment Of pod Yes ！ Think about it ：GetRsLabelsByDeployment I didn't judge rc And pod The relationship between ,pod Of label The judgment is still imprecise , Did not think of a good way , Stole a lazy ：
/src/core/rs_int.go

package core

import (
	"errors"
	"fmt"
	v1 "k8s.io/api/apps/v1"
	"log"
	"sync"
)

type RSMapStruct struct {
	Data sync.Map
}

func (rsmap *RSMapStruct) Add(rs *v1.ReplicaSet) {
	key := rs.Namespace
	if value, ok := rsmap.Data.Load(key); ok {
		value = append(value.([]*v1.ReplicaSet), rs)
		rsmap.Data.Store(key, value)
	} else {
		rsmap.Data.Store(key, []*v1.ReplicaSet{rs})
	}
}
func (rsmap *RSMapStruct) Update(rs *v1.ReplicaSet) error {
	key := rs.Namespace
	if value, ok := rsmap.Data.Load(key); ok {
		for index, r := range value.([]*v1.ReplicaSet) {
			if r.Name == rs.Name {
				value.([]*v1.ReplicaSet)[index] = rs
				rsmap.Data.Store(key, value)
				return nil
			}
		}
	}

	return fmt.Errorf("rs-%s not found", rs.Name)
}

func (rsmap *RSMapStruct) Delete(rs *v1.ReplicaSet) {
	key := rs.Namespace
	if value, ok := rsmap.Data.Load(key); ok {
		for index, r := range value.([]*v1.ReplicaSet) {
			if r.Name == rs.Name {
				value = append(value.([]*v1.ReplicaSet)[0:index], value.([]*v1.ReplicaSet)[index+1:]...)
				rsmap.Data.Store(key, value)
				return
			}
		}
	}
}

func (rsmap *RSMapStruct) ListByNS(ns string) ([]*v1.ReplicaSet, error) {
	if list, ok := rsmap.Data.Load(ns); ok {
		return list.([]*v1.ReplicaSet), nil
	}
	return nil, errors.New("rs record not found")
}

func (rsmap *RSMapStruct) GetRsLabelsByDeployment(deploy *v1.Deployment) ([]map[string]string, error) {
	rs, err := rsmap.ListByNS(deploy.Namespace)
	if err != nil {
		return nil, err
	}
	ret := make([]map[string]string, 0)
	for _, item := range rs {
		//if item.Annotations["deployment.kubernetes.io/revision"] != deploy.Annotations["deployment.kubernetes.io/revision"] {
		//	continue
		//}
		for _, v := range item.OwnerReferences {
			if v.Name == deploy.Name {
				ret = append(ret, item.Labels)
				break
			}
		}
	}
	return ret, nil
}
func (rsmap *RSMapStruct) GetRsLabelsByDeploymentname(deploy *v1.Deployment) string {
	rs, err := rsmap.ListByNS(deploy.Namespace)
	if err != nil {
		fmt.Println(err)
	}
	for _, item := range rs {
		//if item.Annotations["deployment.kubernetes.io/revision"] != deploy.Annotations["deployment.kubernetes.io/revision"] {
		//	continue
		//}
		for _, v := range item.OwnerReferences {
			if v.Name == deploy.Name {
				return item.Name
			}
		}
	}
	return ""
}

type RSHandler struct {
}

func (rsmap *RSHandler) OnAdd(obj interface{}) {
	RSMap.Add(obj.(*v1.ReplicaSet))
}
func (rsmap *RSHandler) OnUpdate(oldObj interface{}, newObj interface{}) {
	err := RSMap.Update(newObj.(*v1.ReplicaSet))
	if err != nil {
		log.Println(err)
	}
}
func (rsmap *RSHandler) OnDelete(obj interface{}) {
	RSMap.Delete(obj.(*v1.ReplicaSet))
}

var RSMap *RSMapStruct

func init() {
	RSMap = &RSMapStruct{}
}

imitation GetRsLabelsByDeployment Wrote a **GetRsLabelsByDeploymentname Method ,** EN return rc Of name be equal to pod Of OwnerReferences In the field name Field !

/src/service/deployment.go

package service

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

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")
	deplist, _ := core.DepMap.ListByNS(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 deplist {
		ret = append(ret, &Deployment{
			Namespace:           item.Namespace,
			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(),
			Pods:                GetPodsByDep(*item),
			CreateTime:          item.CreationTimestamp.Format("2006-01-02 15:03:04"),
		})

	}
	g.JSON(200, ret)
	return
}

func GetLabels(m map[string]string) string {
	labels := ""
	// aa=xxx,xxx=xx
	for k, v := range m {
		if labels != "" {
			labels += ","
		}
		labels += fmt.Sprintf("%s=%s", k, v)
	}
	return labels
}
func GetPodsByDep(dep v1.Deployment) []*Pod {
	rsLabelsMap, err := core.RSMap.GetRsLabelsByDeployment(&dep)
	if err != nil {
		log.Fatal(err)
	}

	pods, err := core.PodMap.ListByRsLabels(dep.Namespace, rsLabelsMap)
	if err != nil {
		log.Fatal(err)
	}
	ret := make([]*Pod, 0)

	for _, pod := range pods {
		if core.RSMap.GetRsLabelsByDeploymentname(&dep) == pod.OwnerReferences[0].Name {
			ret = append(ret, &Pod{
				Name:       pod.Name,
				Namespace:  pod.Namespace,
				Images:     pod.Spec.Containers[0].Image,
				NodeName:   pod.Spec.NodeName,
				Labels:     pod.Labels,
				Status:     string(pod.Status.Phase),
				CreateTime: pod.CreationTimestamp.Format("2006-01-02 15:04:05"),
			})
		}
	}
	return ret
}

function mai.go, visit http://127.0.0.1:8080/deployments?ns=default

It is an accurate match , I don't know if there will be any pits …

summary ：

Sum up the lessons learned in this process ：

1. deployment rs pod The relationship between
2. OwnerReferences The matching of
3. Let's continue crud Well … This place is a little long for me to understand list-watch