k3s/vendor/github.com/xiang90/probing/README.md

Getting Started

Install the handler

We first need to serve the probing HTTP handler.

    http.HandleFunc("/health", probing.NewHandler())
    err := http.ListenAndServe(":12345", nil)
	if err != nil {
		log.Fatal("ListenAndServe: ", err)
	}

Start to probe

Now we can start to probe the endpoint.

    id := "example"
    probingInterval = 5 * time.Second
    url := "http://example.com:12345/health"
    p.AddHTTP(id, probingInterval, url)

	time.Sleep(13 * time.Second)
	status, err := p.Status(id)
 	fmt.Printf("Total Probing: %d, Total Loss: %d, Estimated RTT: %v, Estimated Clock Difference: %v\n",
		status.Total(), status.Loss(), status.SRTT(), status.ClockDiff())
	// Total Probing: 2, Total Loss: 0, Estimated RTT: 320.771µs, Estimated Clock Difference: -35.869µs

TODOs:

• TCP probing
• UDP probing
• Gossip based probing
• More accurate RTT estimation
• More accurate Clock difference estimation
• Use a clock interface rather than the real clock