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iplimiter.go
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iplimiter.go
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package serv
import (
"net"
"net/http"
"time"
cache "github.com/go-pkgz/expirable-cache"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"golang.org/x/time/rate"
)
var ipCache cache.Cache
func init() {
ipCache, _ = cache.NewCache(cache.MaxKeys(10), cache.TTL(time.Minute*5))
}
func getIPLimiter(ip string, limit float64, bucket int) *rate.Limiter {
v, exists := ipCache.Get(ip)
if !exists {
limiter := rate.NewLimiter(rate.Limit(limit), bucket)
ipCache.Set(ip, limiter, 0)
return limiter
}
return v.(*rate.Limiter)
}
func rateLimiter(sc *ServConfig, h http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
var ip string
var err error
if sc.conf.RateLimiter.IPHeader != "" {
ip = r.Header.Get(sc.conf.RateLimiter.IPHeader)
} else {
ip = r.Header.Get("X-Remote-Address")
}
if ip == "" {
ip, _, err = net.SplitHostPort(r.RemoteAddr)
}
if err != nil {
sc.zlog.Error("Rate limiter (Remote IP)", []zapcore.Field{zap.Error(err)}...)
return
}
if !getIPLimiter(ip, sc.conf.RateLimiter.Rate, sc.conf.RateLimiter.Bucket).Allow() {
http.Error(w, "429 Too Many Requests", http.StatusTooManyRequests)
return
}
h.ServeHTTP(w, r)
}
return http.HandlerFunc(fn)
}