define playback retry rules and states

internal/playback/retry.go

@@ -0,0 +1,23 @@
+package playback
+
+import "time"
+
+func (p RetryPolicy) canRetry(failedAttempts int) bool {
+	return p.MaxAttempts == 0 || failedAttempts < p.MaxAttempts
+}
+
+func (p RetryPolicy) retryDelay(failedAttempts int) time.Duration {
+	delay := p.InitialDelay
+
+	for attempt := 1; attempt < failedAttempts; attempt++ {
+		if delay >= p.MaxDelay/2 {
+			return p.MaxDelay
+		}
+		delay *= 2
+	}
+
+	if delay > p.MaxDelay {
+		return p.MaxDelay
+	}
+	return delay
+}