func initWebRateLimiter(app *App) {
rateLimitStore := store.NewMemStore(1000)
if app.redis != nil {
rateLimitStore = store.NewRedisStore(app.redis, "throttle:", 0)
}
rateLimiter := throttled.RateLimit(
app.config.RateLimit,
&throttled.VaryBy{Custom: remoteAddrIP},
rateLimitStore,
)
rateLimiter.DeniedHandler = &RateLimitExceededAction{App: app, Action: Action{}}
app.web.rateLimiter = rateLimiter
}
func throttler(perMinRate int) http.Handler {
t := throttled.RateLimit(throttled.PerMin(perMinRate), &throttled.VaryBy{RemoteAddr: true}, store.NewMemStore(1000))
return t.Throttle(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Nothing needed here
}))
}
func main() {
flag.Parse()
var h http.Handler
var ok, ko int
var mu sync.Mutex
var st throttled.Store
// Keep the start time to print since-time
start := time.Now()
// Create the rate-limit store
switch *storeType {
case "mem":
st = store.NewMemStore(0)
case "redis":
st = store.NewRedisStore(setupRedis(), "throttled:", 0)
default:
log.Fatalf("unsupported store: %s", *storeType)
}
// Create the rate-limit throttler, varying on path
t := throttled.RateLimit(throttled.Q{Requests: *requests, Window: *window}, &throttled.VaryBy{
Path: true,
}, st)
// Set its denied handler
t.DeniedHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if *output == "v" || *output == "ko" {
log.Printf("KO: %s", time.Since(start))
}
throttled.DefaultDeniedHandler.ServeHTTP(w, r)
mu.Lock()
defer mu.Unlock()
ko++
})
// Throttle the OK handler
rand.Seed(time.Now().Unix())
h = t.Throttle(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if *output == "v" || *output == "ok" {
log.Printf("ok: %s", time.Since(start))
}
if *delayRes > 0 {
wait := time.Duration(rand.Intn(int(*delayRes)))
time.Sleep(wait)
}
w.WriteHeader(200)
mu.Lock()
defer mu.Unlock()
ok++
}))
// Print stats once in a while
go func() {
for _ = range time.Tick(10 * time.Second) {
mu.Lock()
log.Printf("ok: %d, ko: %d", ok, ko)
mu.Unlock()
}
}()
fmt.Println("server listening on port 9000")
http.ListenAndServe(":9000", h)
}