Statistics on the time taken for dns queries

Author: mohanson

daze.go

@@ -65,20 +65,17 @@ var Conf = struct {
 // Expv is a simple wrapper around the expvars package.
 var Expv = struct {
 	RouterCacheHits *expvar.Int
-	RouterCacheMiss *expvar.Int
+	RouterCacheCall *expvar.Int
 	RouterCacheRate expvar.Func
 }{
 	RouterCacheHits: expvar.NewInt("RouterCache.Hits"),
-	RouterCacheMiss: expvar.NewInt("RouterCache.Miss"),
+	RouterCacheCall: expvar.NewInt("RouterCache.Call"),
 	RouterCacheRate: func() expvar.Func {
 		f := expvar.Func(func() any {
 			hits := expvar.Get("RouterCache.Hits").(*expvar.Int).Value()
-			miss := expvar.Get("RouterCache.Miss").(*expvar.Int).Value()
-			alls := hits + miss
-			if alls == 0 {
-				return 0
-			}
-			return float64(hits) / float64(alls)
+			call := expvar.Get("RouterCache.Call").(*expvar.Int).Value()
+			doa.Doa(hits <= call)
+			return float64(hits) / float64(max(1, call))
 		})
 		expvar.Publish("RouterCache.Rate", f)
 		return f
@@ -822,12 +819,12 @@ type RouterCache struct {
 
 // Road implements daze.Router.
 func (r *RouterCache) Road(ctx *Context, host string) Road {
+	Expv.RouterCacheCall.Add(1)
 	a, b := r.Lru.GetExists(host)
 	if b {
 		Expv.RouterCacheHits.Add(1)
 		return a
 	}
-	Expv.RouterCacheMiss.Add(1)
 	c := r.Raw.Road(ctx, host)
 	r.Lru.Set(host, c)
 	return c