k8s限速队列不通过Get方法判断队列是否关闭

go.mod

module use-k8s-queue

go 1.19

require k8s.io/client-go v0.28.2

require (
	github.com/go-logr/logr v1.2.4 // indirect
	golang.org/x/time v0.3.0 // indirect
	k8s.io/apimachinery v0.28.2 // indirect
	k8s.io/klog/v2 v2.100.1 // indirect
	k8s.io/utils v0.0.0-20230726121419-3b25d923346b // indirect
)

// k8s.io/api => k8s.io/api v0.0.0-20230915221828-1cac0b1ef7e3
replace k8s.io/apimachinery => k8s.io/apimachinery v0.0.0-20230915221524-64708d3e9048

main.go

package main

import (
	"fmt"

	"k8s.io/client-go/util/workqueue"
)

func main() {
	queue1 := workqueue.NewRateLimitingQueue(workqueue.DefaultControllerRateLimiter())
	queue1.Add("test")
	queue1.ShutDown()
	_, shutdown1 := queue1.Get()
	if shutdown1 {
		fmt.Println("queue1 has shutdown by Get check")
	}
	if queue1.ShuttingDown() {
		fmt.Println("queue1 has shutdown by ShuttingDown check")
	}

	queue2 := workqueue.NewRateLimitingQueue(workqueue.DefaultControllerRateLimiter())
	queue2.ShutDown()
	_, shutdown2 := queue1.Get()
	if shutdown2 {
		fmt.Println("queue2 has shutdown by Get check")
	}
	if queue2.ShuttingDown() {
		fmt.Println("queue2 has shutdown by ShuttingDown check")
	}
}

queue1在Get时还有元素，认为没有关闭，需要ShuttingDown方法才能认为已关闭。
queue2在Get时没有元素，认为已关闭，ShuttingDown方法依然认为已关闭。
不管是否有元素，ShuttingDown方法是判断队列是否关闭的正确方式。