add limiterRefreshInterval option for limiter

handler/http2/handler.go

@@ -77,7 +77,7 @@ func (h *http2Handler) Init(md md.Metadata) error {
 	}
 
 	if limiter := h.options.Limiter; limiter != nil {
-		h.limiter = limiter_util.NewCachedTrafficLimiter(limiter, 30*time.Second, 60*time.Second)
+		h.limiter = limiter_util.NewCachedTrafficLimiter(limiter, h.md.limiterRefreshInterval, 60*time.Second)
 	}
 
 	for _, ro := range h.options.Recorders {
@@ -487,11 +487,7 @@ func (h *http2Handler) observeStats(ctx context.Context) {
 		return
 	}
 
-	d := h.md.observePeriod
-	if d < time.Millisecond {
-		d = 5 * time.Second
-	}
-	ticker := time.NewTicker(d)
+	ticker := time.NewTicker(h.md.observePeriod)
 	defer ticker.Stop()
 
 	for {

handler/http2/metadata.go

@@ -14,11 +14,12 @@ const (
 )
 
 type metadata struct {
-	probeResistance *probeResistance
-	header          http.Header
-	hash            string
-	authBasicRealm  string
-	observePeriod   time.Duration
+	probeResistance        *probeResistance
+	header                 http.Header
+	hash                   string
+	authBasicRealm         string
+	observePeriod          time.Duration
+	limiterRefreshInterval time.Duration
 }
 
 func (h *http2Handler) parseMetadata(md mdata.Metadata) error {
@@ -42,7 +43,21 @@ func (h *http2Handler) parseMetadata(md mdata.Metadata) error {
 	h.md.hash = mdutil.GetString(md, "hash")
 	h.md.authBasicRealm = mdutil.GetString(md, "authBasicRealm")
 
-	h.md.observePeriod = mdutil.GetDuration(md, "observePeriod")
+	h.md.observePeriod = mdutil.GetDuration(md, "observePeriod", "observer.observePeriod")
+	if h.md.observePeriod == 0 {
+		h.md.observePeriod = 5 * time.Second
+	}
+	if h.md.observePeriod < time.Second {
+		h.md.observePeriod = time.Second
+	}
+
+	h.md.limiterRefreshInterval = mdutil.GetDuration(md, "limiter.refreshInterval")
+	if h.md.limiterRefreshInterval == 0 {
+		h.md.limiterRefreshInterval = 30 * time.Second
+	}
+	if h.md.limiterRefreshInterval < time.Second {
+		h.md.limiterRefreshInterval = time.Second
+	}
 
 	return nil
 }