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Last active Aug 25, 2016
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Link redirect and click counter in Go
package main
import (
type RedirectHandler struct {
Counter chan string
func (handler RedirectHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
url := getUrl(r)
go func() { handler.Counter <- url }()
http.Redirect(w, r, url, 301)
type StatsHandler struct {
Urls map[string]int
func (handler StatsHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
url := getUrl(r)
fmt.Fprintf(w, "Count: %d", handler.Urls[url])
func feedCounter(counter chan string, urls map[string]int) {
for url := range counter {
urls[url] += 1
func getUrl(r *http.Request) string {
queryString := r.URL.Query()
return fmt.Sprintf("%s", queryString["u"])
func main() {
counter := make(chan string)
urls := make(map[string]int)
defer close(counter)
go feedCounter(counter, urls)
http.Handle("/", RedirectHandler{Counter: counter})
http.Handle("/stats/", StatsHandler{Urls: urls})
http.ListenAndServe(":8080", nil)
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