fix: change tape error

executor/progress.go

@@ -1,8 +1,55 @@
 package executor
 
+import (
+	"sync/atomic"
+	"time"
+)
+
+const SpeedLen = 30
+
+type speedEvent struct {
+	bytes int64
+	time  time.Time
+}
+
 type progress struct {
-	speed int64
+	speedEvents []speedEvent
+	speedLen    int
+	speedIdx    int
+
+	startTime time.Time
+	speed     int64
 
 	totalBytes, totalFiles int64
 	bytes, files           int64
 }
+
+func newProgress() *progress {
+	return &progress{speedEvents: make([]speedEvent, SpeedLen), speedLen: SpeedLen, startTime: time.Now()}
+}
+
+func (p *progress) setBytes(bytes int64) {
+	atomic.StoreInt64(&p.bytes, bytes)
+	now := time.Now()
+
+	p.speedEvents[p.speedIdx] = speedEvent{bytes: bytes, time: now}
+	for earliest := p.speedIdx; ; {
+		earliest++
+		if earliest >= p.speedLen {
+			earliest = 0
+		}
+		if earliest == p.speedIdx {
+			break
+		}
+
+		if !p.speedEvents[earliest].time.IsZero() {
+			p.speed = (bytes - p.speedEvents[earliest].bytes) * 1e9 / now.Sub(p.speedEvents[earliest].time).Nanoseconds()
+			break
+		}
+	}
+
+	p.speedIdx++
+	if p.speedIdx >= p.speedLen {
+		p.speedIdx = 0
+	}
+}