"ping" a site over HTTP every few seconds and check for status code 200 - just a little play in go

pingo.go

package main

import (
    "fmt"
    "http"
    "time"
)

type Site struct {
    url string
}

// do an HTTP get on the site's url
// check for a 200 status
// returns true if site is alive
func (s *Site) Check() bool {
    client := &http.Client{}
    r,err := client.Get(s.url)
    if err != nil {
        return false
    }
    return r.StatusCode == 200
}

// loop forever checking the site status
// every few seconds
func (s *Site) Monitor(ch chan *Site) {
    for {
        if !s.Check() {
            ch <- s
        }
        time.Sleep(5*1e9)
    }
}

// accept a slice of sites
// launch the Monitor goroutine and give it 
// a channel to report errors to
// return the error-report channel
func MonitorAll(sites []*Site) chan *Site {
    failures := make(chan *Site)
    for i := range sites {
        go sites[i].Monitor(failures)
    }
    return failures
}

// create a list of sites to check
// print a "failed" message if a site is unresponsive
func main() {
    sites := make([]*Site,2)
    sites[0] = &Site{"http://www.google.com"}
    sites[1] = &Site{"http://localhost:5000"}
    for site := range MonitorAll(sites) {
        fmt.Println("Site is down", site.url)
    }
}