spider.go

package main

import ("fmt" 
	"net/http")


type Endpoint struct {
  address string 
  code int 
}


func main() {

		sites := []string{"http://uol.com.br", "http://google.com",
			   "http://github.com", "http://gist.github.com/lorchaos/5681665",
		          "http://invalid-address.copp"}  

	ch := make(chan *Endpoint, 100)

  for _, site := range sites {

    go request(site, ch)
  }

  for {
    
    select {

      case reply := <- ch :
	fmt.Printf("%s -> %d\n", reply.address, reply.code)
    }

  }

}

func request(address string, ch chan *Endpoint) {

  resp, err := http.Get(address) 
  
  status := -1
  if (err == nil) {
    status = resp.StatusCode
  }
  ch <- &Endpoint{address, status}
}