ping.go

package main

import (
	"fmt"
	"github.com/sparrc/go-ping"
	"net"
	"time"
)

func dockerOnline(host string) bool {
	timeout := time.Duration(20) * time.Millisecond
	conn, err := net.DialTimeout("tcp", net.JoinHostPort(host, "22"), timeout)
	if err != nil {
		return false
	}
	if conn != nil {
		defer conn.Close()
		//     fmt.Println("Opened", net.JoinHostPort(host, port))
		return true
	}
	return false
}

func statOnline(host string) bool {
	timeout := time.Duration(20) * time.Millisecond
	conn, err := net.DialTimeout("tcp", net.JoinHostPort(host, "4"), timeout)
	if err != nil {
		return false
	}
	if conn != nil {
		defer conn.Close()
		//     fmt.Println("Opened", net.JoinHostPort(host, port))
		return true
	}
	return false
}

func pingTest(ip string) (bool, time.Duration) {
	pinger, err := ping.NewPinger(ip)

	if err != nil {
		fmt.Printf("ERROR: %s\n", err.Error())
		return false, 0
	} else {
		pinger.SetPrivileged(true)
		pinger.Count = 1
		pinger.Timeout = time.Duration(20) * time.Millisecond

		pinger.Run() // blocks until finished
		stats := pinger.Statistics()

		if pinger.PacketsRecv > 0 {
			return true, stats.AvgRtt
		}
	}
	return false, 0
}