mirror of
https://github.com/SagerNet/sing-box.git
synced 2026-07-19 21:08:40 +08:00
99 lines
2.7 KiB
Go
99 lines
2.7 KiB
Go
package httpclient
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import (
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"context"
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stdTLS "crypto/tls"
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"errors"
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"net"
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"net/http"
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"sync"
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"github.com/sagernet/sing-box/common/tls"
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"github.com/sagernet/sing-box/option"
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E "github.com/sagernet/sing/common/exceptions"
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M "github.com/sagernet/sing/common/metadata"
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N "github.com/sagernet/sing/common/network"
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"golang.org/x/net/http2"
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)
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var errHTTP2Fallback = E.New("fallback to HTTP/1.1")
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type http2FallbackTransport struct {
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h2Transport *http2.Transport
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h1Transport *http1Transport
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fallbackAccess sync.RWMutex
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fallbackAuthority map[string]struct{}
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}
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func newHTTP2FallbackTransport(rawDialer N.Dialer, baseTLSConfig tls.Config, options option.HTTP2Options) (*http2FallbackTransport, error) {
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h1 := newHTTP1Transport(rawDialer, baseTLSConfig)
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h2Transport, err := ConfigureHTTP2Transport(options)
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if err != nil {
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return nil, err
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}
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h2Transport.DialTLSContext = func(ctx context.Context, network, addr string, _ *stdTLS.Config) (net.Conn, error) {
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return dialTLS(ctx, rawDialer, baseTLSConfig, M.ParseSocksaddr(addr), []string{http2.NextProtoTLS, "http/1.1"}, http2.NextProtoTLS)
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}
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return &http2FallbackTransport{
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h2Transport: h2Transport,
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h1Transport: h1,
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fallbackAuthority: make(map[string]struct{}),
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}, nil
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}
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func (t *http2FallbackTransport) isH2Fallback(authority string) bool {
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if authority == "" {
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return false
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}
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t.fallbackAccess.RLock()
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_, found := t.fallbackAuthority[authority]
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t.fallbackAccess.RUnlock()
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return found
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}
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func (t *http2FallbackTransport) markH2Fallback(authority string) {
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if authority == "" {
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return
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}
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t.fallbackAccess.Lock()
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t.fallbackAuthority[authority] = struct{}{}
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t.fallbackAccess.Unlock()
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}
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func (t *http2FallbackTransport) RoundTrip(request *http.Request) (*http.Response, error) {
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return t.roundTrip(request, true)
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}
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func (t *http2FallbackTransport) roundTrip(request *http.Request, allowHTTP1Fallback bool) (*http.Response, error) {
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if request.URL.Scheme != "https" || requestRequiresHTTP1(request) {
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return t.h1Transport.RoundTrip(request)
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}
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authority := requestAuthority(request)
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if t.isH2Fallback(authority) {
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if !allowHTTP1Fallback {
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return nil, errHTTP2Fallback
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}
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return t.h1Transport.RoundTrip(request)
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}
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response, err := t.h2Transport.RoundTrip(request)
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if err == nil {
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return response, nil
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}
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if !errors.Is(err, errHTTP2Fallback) || !allowHTTP1Fallback {
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return nil, err
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}
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t.markH2Fallback(authority)
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return t.h1Transport.RoundTrip(cloneRequestForRetry(request))
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}
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func (t *http2FallbackTransport) CloseIdleConnections() {
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t.h1Transport.CloseIdleConnections()
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t.h2Transport.CloseIdleConnections()
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}
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func (t *http2FallbackTransport) Close() error {
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t.CloseIdleConnections()
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return nil
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}
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