func requestCtrMiddleware(next httpctx.Handler) httpctx.Handler {
return httpctx.HandlerFunc(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
counter.Incr(1)
hitsperminute.Set(counter.Rate())
next.ServeHTTP(ctx, w, r)
})
}
func userIPMiddleware(next httpctx.Handler) httpctx.Handler {
return httpctx.HandlerFunc(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
if userIP, ok := userip.FromRequest(r); ok == nil {
ctx = userip.NewContext(ctx, userIP)
}
next.ServeHTTP(ctx, w, r)
})
}
func requestIDMiddleware(next httpctx.Handler) httpctx.Handler {
return httpctx.HandlerFunc(func(ctx context.Context, w http.ResponseWriter, r *http.Request) {
if reqID, ok := requestid.FromRequest(r); ok == nil {
ctx = requestid.NewContext(ctx, reqID)
}
next.ServeHTTP(ctx, w, r)
})
}
func main() {
counter = ratecounter.NewRateCounter(1 * time.Minute)
port := os.Getenv("PORT")
if port == "" {
log.Fatal("$PORT must be set")
}
var handler httpctx.Handler
handler = httpctx.HandlerFunc(requestHandler)
handler = userIPMiddleware(handler)
handler = requestIDMiddleware(handler)
handler = requestCtrMiddleware(handler)
ctx := context.Background()
svc := &Server{ctx, handler}
http.HandleFunc("/", svc.ServeHTTP)
log.Fatal(http.ListenAndServe(":"+port, nil))
}