159 lines
2.9 KiB
Go
159 lines
2.9 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/atomic"
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"time"
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"github.com/Dreamacro/clash/common/picker"
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C "github.com/Dreamacro/clash/constant"
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)
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type URLTest struct {
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*Base
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proxies []C.Proxy
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rawURL string
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fast C.Proxy
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interval time.Duration
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done chan struct{}
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once int32
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}
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type URLTestOption 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 (u *URLTest) Now() string {
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return u.fast.Name()
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}
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func (u *URLTest) Dial(metadata *C.Metadata) (c C.Conn, err error) {
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for i := 0; i < 3; i++ {
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c, err = u.fast.Dial(metadata)
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if err == nil {
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c.AppendToChains(u)
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return
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}
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u.fallback()
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}
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return
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}
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func (u *URLTest) DialUDP(metadata *C.Metadata) (C.PacketConn, net.Addr, error) {
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pc, addr, err := u.fast.DialUDP(metadata)
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if err == nil {
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pc.AppendToChains(u)
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}
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return pc, addr, err
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}
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func (u *URLTest) SupportUDP() bool {
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return u.fast.SupportUDP()
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}
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func (u *URLTest) MarshalJSON() ([]byte, error) {
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var all []string
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for _, proxy := range u.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": u.Type().String(),
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"now": u.Now(),
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"all": all,
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})
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}
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func (u *URLTest) Destroy() {
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u.done <- struct{}{}
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}
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func (u *URLTest) loop() {
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tick := time.NewTicker(u.interval)
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go u.speedTest()
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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 u.speedTest()
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case <-u.done:
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break Loop
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}
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}
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}
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func (u *URLTest) fallback() {
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fast := u.proxies[0]
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min := fast.LastDelay()
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for _, proxy := range u.proxies[1:] {
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if !proxy.Alive() {
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continue
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}
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delay := proxy.LastDelay()
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if delay < min {
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fast = proxy
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min = delay
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}
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}
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u.fast = fast
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}
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func (u *URLTest) speedTest() {
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if !atomic.CompareAndSwapInt32(&u.once, 0, 1) {
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return
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}
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defer atomic.StoreInt32(&u.once, 0)
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ctx, cancel := context.WithTimeout(context.Background(), defaultURLTestTimeout)
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defer cancel()
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picker := picker.WithoutAutoCancel(ctx)
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for _, p := range u.proxies {
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proxy := p
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picker.Go(func() (interface{}, error) {
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_, err := proxy.URLTest(ctx, u.rawURL)
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if err != nil {
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return nil, err
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}
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return proxy, nil
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})
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}
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fast := picker.WaitWithoutCancel()
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if fast != nil {
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u.fast = fast.(C.Proxy)
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}
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picker.Wait()
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}
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func NewURLTest(option URLTestOption, proxies []C.Proxy) (*URLTest, 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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urlTest := &URLTest{
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Base: &Base{
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name: option.Name,
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tp: C.URLTest,
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},
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proxies: proxies[:],
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rawURL: option.URL,
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fast: proxies[0],
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interval: interval,
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done: make(chan struct{}),
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once: 0,
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}
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go urlTest.loop()
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return urlTest, nil
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}
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