func StartServer() {
l4g.Info("Starting Server...")
l4g.Info("Server is listening on " + utils.Cfg.ServiceSettings.ListenAddress)
var handler http.Handler = Srv.Router
if utils.Cfg.RateLimitSettings.EnableRateLimiter {
l4g.Info("RateLimiter is enabled")
vary := throttled.VaryBy{}
if utils.Cfg.RateLimitSettings.VaryByRemoteAddr {
vary.RemoteAddr = true
}
if len(utils.Cfg.RateLimitSettings.VaryByHeader) > 0 {
vary.Headers = strings.Fields(utils.Cfg.RateLimitSettings.VaryByHeader)
if utils.Cfg.RateLimitSettings.VaryByRemoteAddr {
l4g.Warn("RateLimitSettings not configured properly using VaryByHeader and disabling VaryByRemoteAddr")
vary.RemoteAddr = false
}
}
th := throttled.RateLimit(throttled.PerSec(utils.Cfg.RateLimitSettings.PerSec), &vary, throttledStore.NewMemStore(utils.Cfg.RateLimitSettings.MemoryStoreSize))
th.DeniedHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
l4g.Error("%v: code=429 ip=%v", r.URL.Path, GetIpAddress(r))
throttled.DefaultDeniedHandler.ServeHTTP(w, r)
})
handler = th.Throttle(Srv.Router)
}
go func() {
err := Srv.Server.ListenAndServe(utils.Cfg.ServiceSettings.ListenAddress, handler)
if err != nil {
l4g.Critical("Error starting server, err:%v", err)
time.Sleep(time.Second)
panic("Error starting server " + err.Error())
}
}()
}
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)
}