chore: refresh gramsrv public release

internal/rpc/idle_backoff.go

@@ -0,0 +1,65 @@
+package rpc
+
+import (
+	"context"
+	"time"
+)
+
+const defaultIdleDispatchMaxInterval = 5 * time.Second
+
+type idleBackoff struct {
+	base time.Duration
+	max  time.Duration
+	next time.Duration
+}
+
+func newIdleBackoff(base, max time.Duration) idleBackoff {
+	if base <= 0 {
+		base = time.Second
+	}
+	if max < base {
+		max = base
+	}
+	return idleBackoff{
+		base: base,
+		max:  max,
+		next: base,
+	}
+}
+
+func (b *idleBackoff) ActiveDelay() time.Duration {
+	b.next = b.base
+	return b.base
+}
+
+func (b *idleBackoff) IdleDelay() time.Duration {
+	delay := b.next
+	if b.next < b.max {
+		b.next *= 2
+		if b.next > b.max {
+			b.next = b.max
+		}
+	}
+	return delay
+}
+
+func runIdleBackoffLoop(ctx context.Context, interval, maxIdleInterval time.Duration, dispatch func(context.Context) bool) {
+	if dispatch == nil {
+		return
+	}
+	backoff := newIdleBackoff(interval, maxIdleInterval)
+	timer := time.NewTimer(0)
+	defer timer.Stop()
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-timer.C:
+		}
+		if dispatch(ctx) {
+			timer.Reset(backoff.ActiveDelay())
+			continue
+		}
+		timer.Reset(backoff.IdleDelay())
+	}
+}