add scope param for traffic limiter

handler/relay/handler.go

@@ -9,9 +9,11 @@ import (
 
 	"github.com/go-gost/core/handler"
 	"github.com/go-gost/core/hop"
+	"github.com/go-gost/core/limiter/traffic"
 	md "github.com/go-gost/core/metadata"
 	"github.com/go-gost/relay"
 	ctxvalue "github.com/go-gost/x/ctx"
+	limiter_util "github.com/go-gost/x/internal/util/limiter"
 	stats_util "github.com/go-gost/x/internal/util/stats"
 	"github.com/go-gost/x/registry"
 )
@@ -32,6 +34,7 @@ type relayHandler struct {
 	md      metadata
 	options handler.Options
 	stats   *stats_util.HandlerStats
+	limiter traffic.TrafficLimiter
 	cancel  context.CancelFunc
 }
 
@@ -43,7 +46,6 @@ func NewHandler(opts ...handler.Option) handler.Handler {
 
 	return &relayHandler{
 		options: options,
-		stats:   stats_util.NewHandlerStats(options.Service),
 	}
 }
 
@@ -56,9 +58,14 @@ func (h *relayHandler) Init(md md.Metadata) (err error) {
 	h.cancel = cancel
 
 	if h.options.Observer != nil {
+		h.stats = stats_util.NewHandlerStats(h.options.Service)
 		go h.observeStats(ctx)
 	}
 
+	if limiter := h.options.Limiter; limiter != nil {
+		h.limiter = limiter_util.NewCachedTrafficLimiter(limiter, 30*time.Second, 60*time.Second)
+	}
+
 	return nil
 }