151 lines
3.6 KiB
Go
151 lines
3.6 KiB
Go
package outboundgroup
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import (
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"context"
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"encoding/json"
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"github.com/Dreamacro/clash/log"
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"go.uber.org/atomic"
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"time"
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"github.com/Dreamacro/clash/adapter/outbound"
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"github.com/Dreamacro/clash/common/singledo"
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"github.com/Dreamacro/clash/component/dialer"
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C "github.com/Dreamacro/clash/constant"
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"github.com/Dreamacro/clash/constant/provider"
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)
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type Fallback struct {
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*outbound.Base
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disableUDP bool
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filter string
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single *singledo.Single
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providers []provider.ProxyProvider
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failedTimes *atomic.Int32
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failedTime *atomic.Int64
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}
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func (f *Fallback) Now() string {
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proxy := f.findAliveProxy(false)
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return proxy.Name()
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}
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// DialContext implements C.ProxyAdapter
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func (f *Fallback) DialContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (C.Conn, error) {
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proxy := f.findAliveProxy(true)
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c, err := proxy.DialContext(ctx, metadata, f.Base.DialOptions(opts...)...)
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if err == nil {
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c.AppendToChains(f)
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f.failedTimes.Store(-1)
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f.failedTime.Store(-1)
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} else {
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f.onDialFailed()
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}
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return c, err
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}
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// ListenPacketContext implements C.ProxyAdapter
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func (f *Fallback) ListenPacketContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (C.PacketConn, error) {
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proxy := f.findAliveProxy(true)
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pc, err := proxy.ListenPacketContext(ctx, metadata, f.Base.DialOptions(opts...)...)
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if err == nil {
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pc.AppendToChains(f)
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f.failedTimes.Store(-1)
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f.failedTime.Store(-1)
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} else {
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f.onDialFailed()
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}
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return pc, err
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}
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func (f *Fallback) onDialFailed() {
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if f.failedTime.Load() == -1 {
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log.Warnln("%s first failed", f.Name())
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now := time.Now().UnixMilli()
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f.failedTime.Store(now)
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f.failedTimes.Store(1)
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} else {
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if f.failedTime.Load()-time.Now().UnixMilli() > 5*time.Second.Milliseconds() {
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f.failedTimes.Store(-1)
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f.failedTime.Store(-1)
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} else {
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failedCount := f.failedTimes.Inc()
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log.Warnln("%s failed count: %d", f.Name(), failedCount)
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if failedCount >= 5 {
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log.Warnln("because %s failed multiple times, active health check", f.Name())
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for _, proxyProvider := range f.providers {
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go proxyProvider.HealthCheck()
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}
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f.failedTimes.Store(-1)
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f.failedTime.Store(-1)
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}
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}
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}
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}
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// SupportUDP implements C.ProxyAdapter
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func (f *Fallback) SupportUDP() bool {
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if f.disableUDP {
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return false
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}
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proxy := f.findAliveProxy(false)
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return proxy.SupportUDP()
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}
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// MarshalJSON implements C.ProxyAdapter
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func (f *Fallback) MarshalJSON() ([]byte, error) {
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var all []string
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for _, proxy := range f.proxies(false) {
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all = append(all, proxy.Name())
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}
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return json.Marshal(map[string]any{
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"type": f.Type().String(),
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"now": f.Now(),
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"all": all,
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})
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}
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// Unwrap implements C.ProxyAdapter
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func (f *Fallback) Unwrap(metadata *C.Metadata) C.Proxy {
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proxy := f.findAliveProxy(true)
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return proxy
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}
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func (f *Fallback) proxies(touch bool) []C.Proxy {
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elm, _, _ := f.single.Do(func() (any, error) {
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return getProvidersProxies(f.providers, touch, f.filter), nil
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})
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return elm.([]C.Proxy)
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}
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func (f *Fallback) findAliveProxy(touch bool) C.Proxy {
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proxies := f.proxies(touch)
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for _, proxy := range proxies {
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if proxy.Alive() {
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return proxy
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}
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}
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return proxies[0]
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}
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func NewFallback(option *GroupCommonOption, providers []provider.ProxyProvider) *Fallback {
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return &Fallback{
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Base: outbound.NewBase(outbound.BaseOption{
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Name: option.Name,
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Type: C.Fallback,
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Interface: option.Interface,
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RoutingMark: option.RoutingMark,
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}),
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single: singledo.NewSingle(defaultGetProxiesDuration),
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providers: providers,
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disableUDP: option.DisableUDP,
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filter: option.Filter,
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failedTimes: atomic.NewInt32(-1),
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failedTime: atomic.NewInt64(-1),
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}
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}
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