mirror of https://github.com/v2fly/v2ray-core.git
54 lines
1.4 KiB
Go
54 lines
1.4 KiB
Go
package router
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import (
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"github.com/v2fly/v2ray-core/v4/features/outbound"
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"github.com/v2fly/v2ray-core/v4/features/routing"
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)
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// Balancer represents a balancer
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type Balancer struct {
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selectors []string
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strategy routing.BalancingStrategy
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ohm outbound.Manager
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fallbackTag string
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override override
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}
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// PickOutbound picks the tag of a outbound
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func (b *Balancer) PickOutbound() (string, error) {
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candidates, err := b.SelectOutbounds()
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if err != nil {
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if b.fallbackTag != "" {
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newError("fallback to [", b.fallbackTag, "], due to error: ", err).AtInfo().WriteToLog()
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return b.fallbackTag, nil
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}
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return "", err
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}
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var tag string
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if o := b.override.Get(); o != nil {
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tag = b.strategy.Pick(o.selects)
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} else {
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tag = b.strategy.SelectAndPick(candidates)
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}
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if tag == "" {
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if b.fallbackTag != "" {
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newError("fallback to [", b.fallbackTag, "], due to empty tag returned").AtInfo().WriteToLog()
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return b.fallbackTag, nil
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}
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// will use default handler
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return "", newError("balancing strategy returns empty tag")
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}
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return tag, nil
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}
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// SelectOutbounds select outbounds with selectors of the Balancer
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func (b *Balancer) SelectOutbounds() ([]string, error) {
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hs, ok := b.ohm.(outbound.HandlerSelector)
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if !ok {
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return nil, newError("outbound.Manager is not a HandlerSelector")
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}
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tags := hs.Select(b.selectors)
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return tags, nil
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}
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