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// +build !confonly
package router
import (
"v2ray.com/core/common/dice"
"v2ray.com/core/features/outbound"
)
type BalancingStrategy interface {
PickOutbound([]string) string
}
type RandomStrategy struct {
}
func (s *RandomStrategy) PickOutbound(tags []string) string {
n := len(tags)
if n == 0 {
panic("0 tags")
}
return tags[dice.Roll(n)]
}
type Balancer struct {
selectors []string
strategy BalancingStrategy
ohm outbound.Manager
}
func (b *Balancer) PickOutbound() (string, error) {
hs, ok := b.ohm.(outbound.HandlerSelector)
if !ok {
return "", newError("outbound.Manager is not a HandlerSelector")
}
tags := hs.Select(b.selectors)
if len(tags) == 0 {
return "", newError("no available outbounds selected")
}
tag := b.strategy.PickOutbound(tags)
if len(tag) == 0 {
return "", newError("balancing strategy returns empty tag")
}
return tag, nil
}
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