fix: go back to the old averaging

steamcache/avgcachestate/avgcachestate.go

@@ -7,11 +7,9 @@ import (
 
 // AvgCacheState is a cache state that averages the last N cache states.
 type AvgCacheState struct {
-	size   int
-	hits   int
-	misses int
-	avgs   []cachestate.CacheState
-	mu     sync.Mutex
+	size int
+	avgs []cachestate.CacheState
+	mu   sync.Mutex
 }
 
 // New creates a new average cache state with the given size.
@@ -44,21 +42,8 @@ func (a *AvgCacheState) Add(cs cachestate.CacheState) {
 
 	a.avgs = append(a.avgs, cs)
 	if len(a.avgs) > a.size {
-		switch a.avgs[0] {
-		case cachestate.CacheStateHit:
-			a.hits--
-		case cachestate.CacheStateMiss:
-			a.misses--
-		}
 		a.avgs = a.avgs[1:]
 	}
-
-	switch cs {
-	case cachestate.CacheStateHit:
-		a.hits++
-	case cachestate.CacheStateMiss:
-		a.misses++
-	}
 }
 
 // Avg returns the average cache state.
@@ -66,5 +51,13 @@ func (a *AvgCacheState) Avg() float64 {
 	a.mu.Lock()
 	defer a.mu.Unlock()
 
-	return float64(a.hits) / (float64(a.misses) + 0.0000001)
+	var hits int
+
+	for _, cs := range a.avgs {
+		if cs == cachestate.CacheStateHit {
+			hits++
+		}
+	}
+
+	return float64(hits) / float64(len(a.avgs))
 }