2021-06-10 06:05:56 +00:00
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package adapter
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2018-12-22 15:56:42 +00:00
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import (
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2019-07-02 11:18:03 +00:00
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"context"
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2018-12-22 15:56:42 +00:00
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"encoding/json"
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2021-06-10 06:05:56 +00:00
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"fmt"
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2019-03-15 16:43:16 +00:00
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"net"
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"net/http"
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"net/url"
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"time"
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2018-12-22 15:56:42 +00:00
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2019-03-17 06:52:39 +00:00
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"github.com/Dreamacro/clash/common/queue"
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2021-11-07 08:48:51 +00:00
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"github.com/Dreamacro/clash/component/dialer"
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2018-12-22 15:56:42 +00:00
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C "github.com/Dreamacro/clash/constant"
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2020-10-29 09:51:14 +00:00
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"go.uber.org/atomic"
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2018-12-22 15:56:42 +00:00
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)
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2021-12-26 13:20:41 +00:00
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var UnifiedDelay = atomic.NewBool(false)
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type Proxy struct {
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C.ProxyAdapter
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history *queue.Queue
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alive *atomic.Bool
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}
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2021-04-29 03:23:14 +00:00
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// Alive implements C.Proxy
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func (p *Proxy) Alive() bool {
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return p.alive.Load()
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}
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// Dial implements C.Proxy
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func (p *Proxy) Dial(metadata *C.Metadata) (C.Conn, error) {
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ctx, cancel := context.WithTimeout(context.Background(), C.DefaultTCPTimeout)
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defer cancel()
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return p.DialContext(ctx, metadata)
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}
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// DialContext implements C.ProxyAdapter
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func (p *Proxy) DialContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (C.Conn, error) {
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conn, err := p.ProxyAdapter.DialContext(ctx, metadata, opts...)
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p.alive.Store(err == nil)
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return conn, err
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}
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2021-10-15 13:44:53 +00:00
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// DialUDP implements C.ProxyAdapter
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func (p *Proxy) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
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ctx, cancel := context.WithTimeout(context.Background(), C.DefaultUDPTimeout)
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defer cancel()
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return p.ListenPacketContext(ctx, metadata)
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}
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// ListenPacketContext implements C.ProxyAdapter
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func (p *Proxy) ListenPacketContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (C.PacketConn, error) {
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pc, err := p.ProxyAdapter.ListenPacketContext(ctx, metadata, opts...)
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p.alive.Store(err == nil)
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return pc, err
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}
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// DelayHistory implements C.Proxy
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func (p *Proxy) DelayHistory() []C.DelayHistory {
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queue := p.history.Copy()
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histories := []C.DelayHistory{}
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for _, item := range queue {
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histories = append(histories, item.(C.DelayHistory))
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}
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return histories
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}
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2019-09-07 08:23:43 +00:00
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// LastDelay return last history record. if proxy is not alive, return the max value of uint16.
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// implements C.Proxy
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func (p *Proxy) LastDelay() (delay uint16) {
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var max uint16 = 0xffff
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if !p.alive.Load() {
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return max
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}
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2019-09-26 02:08:50 +00:00
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last := p.history.Last()
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if last == nil {
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return max
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}
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history := last.(C.DelayHistory)
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if history.Delay == 0 {
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return max
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}
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return history.Delay
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}
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// MarshalJSON implements C.ProxyAdapter
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func (p *Proxy) MarshalJSON() ([]byte, error) {
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inner, err := p.ProxyAdapter.MarshalJSON()
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if err != nil {
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return inner, err
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}
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mapping := map[string]interface{}{}
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json.Unmarshal(inner, &mapping)
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mapping["history"] = p.DelayHistory()
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mapping["name"] = p.Name()
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mapping["udp"] = p.SupportUDP()
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return json.Marshal(mapping)
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}
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2019-03-15 16:43:16 +00:00
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// URLTest get the delay for the specified URL
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// implements C.Proxy
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func (p *Proxy) URLTest(ctx context.Context, url string) (t uint16, err error) {
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defer func() {
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p.alive.Store(err == nil)
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record := C.DelayHistory{Time: time.Now()}
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if err == nil {
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record.Delay = t
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}
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p.history.Put(record)
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if p.history.Len() > 10 {
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p.history.Pop()
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}
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}()
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2021-12-26 13:20:41 +00:00
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unifiedDelay := UnifiedDelay.Load()
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2019-03-15 16:43:16 +00:00
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addr, err := urlToMetadata(url)
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if err != nil {
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return
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}
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start := time.Now()
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instance, err := p.DialContext(ctx, &addr)
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if err != nil {
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return
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}
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defer instance.Close()
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2019-08-09 07:39:13 +00:00
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req, err := http.NewRequest(http.MethodHead, url, nil)
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if err != nil {
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return
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}
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req = req.WithContext(ctx)
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transport := &http.Transport{
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Dial: func(string, string) (net.Conn, error) {
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return instance, nil
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},
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// from http.DefaultTransport
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MaxIdleConns: 100,
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IdleConnTimeout: 90 * time.Second,
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TLSHandshakeTimeout: 10 * time.Second,
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ExpectContinueTimeout: 1 * time.Second,
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}
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2020-02-25 08:08:13 +00:00
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client := http.Client{
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Transport: transport,
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CheckRedirect: func(req *http.Request, via []*http.Request) error {
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return http.ErrUseLastResponse
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},
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}
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defer client.CloseIdleConnections()
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resp, err := client.Do(req)
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if err != nil {
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return
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}
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2021-12-26 13:20:41 +00:00
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if unifiedDelay {
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start = time.Now()
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resp, err = client.Do(req)
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if err != nil {
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return
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}
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}
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resp.Body.Close()
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t = uint16(time.Since(start) / time.Millisecond)
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return
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}
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func NewProxy(adapter C.ProxyAdapter) *Proxy {
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return &Proxy{adapter, queue.New(10), atomic.NewBool(true)}
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}
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func urlToMetadata(rawURL string) (addr C.Metadata, err error) {
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u, err := url.Parse(rawURL)
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if err != nil {
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return
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}
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port := u.Port()
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if port == "" {
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switch u.Scheme {
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case "https":
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port = "443"
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case "http":
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port = "80"
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default:
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err = fmt.Errorf("%s scheme not Support", rawURL)
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return
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}
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}
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addr = C.Metadata{
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AddrType: C.AtypDomainName,
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Host: u.Hostname(),
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DstIP: nil,
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DstPort: port,
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}
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return
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}
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