134 lines
2.4 KiB
Go
134 lines
2.4 KiB
Go
package adapters
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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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"net"
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"sync"
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"time"
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C "github.com/Dreamacro/clash/constant"
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)
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type Fallback struct {
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*Base
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proxies []C.Proxy
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rawURL string
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interval time.Duration
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done chan struct{}
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}
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type FallbackOption struct {
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Name string `proxy:"name"`
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Proxies []string `proxy:"proxies"`
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URL string `proxy:"url"`
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Interval int `proxy:"interval"`
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}
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func (f *Fallback) Now() string {
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proxy := f.findAliveProxy()
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return proxy.Name()
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}
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func (f *Fallback) Dial(metadata *C.Metadata) (C.Conn, error) {
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proxy := f.findAliveProxy()
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c, err := proxy.Dial(metadata)
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if err == nil {
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c.AppendToChains(f)
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}
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return c, err
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}
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func (f *Fallback) DialUDP(metadata *C.Metadata) (C.PacketConn, net.Addr, error) {
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proxy := f.findAliveProxy()
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pc, addr, err := proxy.DialUDP(metadata)
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if err == nil {
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pc.AppendToChains(f)
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}
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return pc, addr, err
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}
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func (f *Fallback) SupportUDP() bool {
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proxy := f.findAliveProxy()
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return proxy.SupportUDP()
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}
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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 {
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all = append(all, proxy.Name())
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}
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return json.Marshal(map[string]interface{}{
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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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func (f *Fallback) Destroy() {
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f.done <- struct{}{}
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}
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func (f *Fallback) loop() {
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tick := time.NewTicker(f.interval)
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go f.validTest()
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Loop:
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for {
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select {
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case <-tick.C:
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go f.validTest()
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case <-f.done:
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break Loop
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}
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}
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}
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func (f *Fallback) findAliveProxy() C.Proxy {
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for _, proxy := range f.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 f.proxies[0]
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}
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func (f *Fallback) validTest() {
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wg := sync.WaitGroup{}
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wg.Add(len(f.proxies))
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for _, p := range f.proxies {
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go func(p C.Proxy) {
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p.URLTest(context.Background(), f.rawURL)
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wg.Done()
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}(p)
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}
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wg.Wait()
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}
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func NewFallback(option FallbackOption, proxies []C.Proxy) (*Fallback, error) {
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_, err := urlToMetadata(option.URL)
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if err != nil {
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return nil, err
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}
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if len(proxies) < 1 {
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return nil, errors.New("The number of proxies cannot be 0")
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}
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interval := time.Duration(option.Interval) * time.Second
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Fallback := &Fallback{
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Base: &Base{
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name: option.Name,
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tp: C.Fallback,
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},
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proxies: proxies,
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rawURL: option.URL,
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interval: interval,
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done: make(chan struct{}),
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}
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go Fallback.loop()
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return Fallback, nil
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}
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