package outboundgroup import ( "context" "encoding/json" "errors" "fmt" "github.com/Dreamacro/clash/adapters/outbound" "github.com/Dreamacro/clash/adapters/provider" "github.com/Dreamacro/clash/common/singledo" "github.com/Dreamacro/clash/component/dialer" C "github.com/Dreamacro/clash/constant" ) type Relay struct { *outbound.Base single *singledo.Single providers []provider.ProxyProvider } func (r *Relay) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) { proxies := r.proxies(metadata) if len(proxies) == 0 { return nil, errors.New("Proxy does not exist") } first := proxies[0] last := proxies[len(proxies)-1] c, err := dialer.DialContext(ctx, "tcp", first.Addr()) if err != nil { return nil, fmt.Errorf("%s connect error: %w", first.Addr(), err) } tcpKeepAlive(c) var currentMeta *C.Metadata for _, proxy := range proxies[1:] { currentMeta, err = addrToMetadata(proxy.Addr()) if err != nil { return nil, err } c, err = first.StreamConn(c, currentMeta) if err != nil { return nil, fmt.Errorf("%s connect error: %w", first.Addr(), err) } first = proxy } c, err = last.StreamConn(c, metadata) if err != nil { return nil, fmt.Errorf("%s connect error: %w", last.Addr(), err) } return outbound.NewConn(c, r), nil } func (r *Relay) MarshalJSON() ([]byte, error) { var all []string for _, proxy := range r.rawProxies() { all = append(all, proxy.Name()) } return json.Marshal(map[string]interface{}{ "type": r.Type().String(), "all": all, }) } func (r *Relay) rawProxies() []C.Proxy { elm, _, _ := r.single.Do(func() (interface{}, error) { return getProvidersProxies(r.providers), nil }) return elm.([]C.Proxy) } func (r *Relay) proxies(metadata *C.Metadata) []C.Proxy { proxies := r.rawProxies() for n, proxy := range proxies { subproxy := proxy.Unwrap(metadata) for subproxy != nil { proxies[n] = subproxy subproxy = subproxy.Unwrap(metadata) } } return proxies } func NewRelay(name string, providers []provider.ProxyProvider) *Relay { return &Relay{ Base: outbound.NewBase(name, "", C.Relay, false), single: singledo.NewSingle(defaultGetProxiesDuration), providers: providers, } }