notify "Wow! A notification!!!"

longRunningCommand && notify done!

package main

import (
    "github.com/deckarep/gosx-notifier"
    "log"
)

func main() {
    //At a minimum specifiy a message to display to end-user.
    note := gosxnotifier.NewNotification("Check your Apple Stock!")

    //Optionally, set a title
    note.Title = "It's money making time 💰"

    //Optionally, set a subtitle
    note.Subtitle = "My subtitle"

    //Optionally, set a sound from a predefined set.
    note.Sound = gosxnotifier.Basso

    //Optionally, set a group which ensures only one notification is ever shown replacing previous notification of same group id.
    note.Group = "com.unique.yourapp.identifier"

    //Optionally, set a sender (Notification will now use the Safari icon)
    note.Sender = "com.apple.Safari"

    //Optionally, specifiy a url or bundleid to open should the notification be
    //clicked.
    note.Link = "http://www.yahoo.com" //or BundleID like: com.apple.Terminal

    //Optionally, an app icon (10.9+ ONLY)
    note.AppIcon = "gopher.png"

    //Optionally, a content image (10.9+ ONLY)
    note.ContentImage = "gopher.png"

    //Then, push the notification
    err := note.Push()

    //If necessary, check error
    if err != nil {
        log.Println("Uh oh!")
    }
}

package main

import (
	"github.com/deckarep/gosx-notifier"
	"net/http"
	"strings"
	"time"
)

//a slice of string sites that you are interested in watching
var sites []string = []string{
	"http://www.yahoo.com",
	"http://www.google.com",
	"http://www.bing.com"}

func main() {
	ch := make(chan string)

	for _, s := range sites {
		go pinger(ch, s)
	}

	for {
		select {
		case result := <-ch:
			if strings.HasPrefix(result, "-") {
				s := strings.Trim(result, "-")
				showNotification("Urgent, can't ping website: " + s)
			}
		}
	}
}

func showNotification(message string) {

	note := gosxnotifier.NewNotification(message)
	note.Title = "Site Down"
	note.Sound = gosxnotifier.Default

	note.Push()
}

//Prefixing a site with a + means it's up, while - means it's down
func pinger(ch chan string, site string) {
	for {
		res, err := http.Get(site)

		if err != nil {
			ch <- "-" + site
		} else {
			if res.StatusCode != 200 {
				ch <- "-" + site
			} else {
				ch <- "+" + site
			}
			res.Body.Close()
		}
		time.Sleep(30 * time.Second)
	}
}