套餐可以设置带宽限制

internal/utils/ratelimit/bandwidth.go

@@ -0,0 +1,61 @@
+// Copyright 2024 GoEdge CDN goedge.cdn@gmail.com. All rights reserved. Official site: https://goedge.cn .
+
+package ratelimit
+
+import (
+	"context"
+	"github.com/TeaOSLab/EdgeNode/internal/utils/fasttime"
+	"sync/atomic"
+	"time"
+)
+
+// Bandwidth lossy bandwidth limiter
+type Bandwidth struct {
+	totalBytes int64
+
+	currentTimestamp int64
+	currentBytes     int64
+}
+
+// NewBandwidth create new bandwidth limiter
+func NewBandwidth(totalBytes int64) *Bandwidth {
+	return &Bandwidth{totalBytes: totalBytes}
+}
+
+// Ack acquire next chance to send data
+func (this *Bandwidth) Ack(ctx context.Context, newBytes int) {
+	if newBytes <= 0 {
+		return
+	}
+	if this.totalBytes <= 0 {
+		return
+	}
+
+	var timestamp = fasttime.Now().Unix()
+	if this.currentTimestamp != 0 && this.currentTimestamp != timestamp {
+		this.currentTimestamp = timestamp
+		this.currentBytes = int64(newBytes)
+
+		// 第一次发送直接放行，不需要判断
+		return
+	}
+
+	if this.currentTimestamp == 0 {
+		this.currentTimestamp = timestamp
+	}
+	if atomic.AddInt64(&this.currentBytes, int64(newBytes)) <= this.totalBytes {
+		return
+	}
+
+	var timeout = time.NewTimer(1 * time.Second)
+	if ctx != nil {
+		select {
+		case <-timeout.C:
+		case <-ctx.Done():
+		}
+	} else {
+		select {
+		case <-timeout.C:
+		}
+	}
+}