142 lines
3 KiB
Go
142 lines
3 KiB
Go
package outboundgroup
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import (
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"context"
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"encoding/json"
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"errors"
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"time"
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"github.com/Dreamacro/clash/adapter/outbound"
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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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*GroupBase
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disableUDP bool
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testUrl string
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selected string
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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.onDialSuccess()
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} else {
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f.onDialFailed(proxy.Type(), err)
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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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}
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return pc, err
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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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all := []string{}
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for _, proxy := range f.GetProxies(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, touch bool) C.Proxy {
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proxy := f.findAliveProxy(touch)
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return proxy
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}
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func (f *Fallback) findAliveProxy(touch bool) C.Proxy {
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proxies := f.GetProxies(touch)
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for _, proxy := range proxies {
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if len(f.selected) == 0 {
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if proxy.Alive() {
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return proxy
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}
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} else {
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if proxy.Name() == f.selected {
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if proxy.Alive() {
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return proxy
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} else {
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f.selected = ""
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}
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}
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}
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}
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return proxies[0]
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}
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func (f *Fallback) Set(name string) error {
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var p C.Proxy
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for _, proxy := range f.GetProxies(false) {
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if proxy.Name() == name {
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p = proxy
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break
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}
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}
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if p == nil {
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return errors.New("proxy not exist")
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}
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f.selected = name
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if !p.Alive() {
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ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond*time.Duration(5000))
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defer cancel()
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_, _ = p.URLTest(ctx, f.testUrl)
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}
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return nil
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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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GroupBase: NewGroupBase(GroupBaseOption{
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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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option.Filter,
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option.ExcludeFilter,
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option.ExcludeType,
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providers,
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}),
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disableUDP: option.DisableUDP,
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testUrl: option.URL,
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}
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}
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