clash/adapters/outboundgroup/fallback.go

89 lines
1.9 KiB
Go

package outboundgroup
import (
"context"
"encoding/json"
"github.com/Dreamacro/clash/adapters/outbound"
"github.com/Dreamacro/clash/adapters/provider"
"github.com/Dreamacro/clash/common/singledo"
C "github.com/Dreamacro/clash/constant"
)
type Fallback struct {
*outbound.Base
single *singledo.Single
providers []provider.ProxyProvider
}
func (f *Fallback) Now() string {
proxy := f.findAliveProxy()
return proxy.Name()
}
func (f *Fallback) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
proxy := f.findAliveProxy()
c, err := proxy.DialContext(ctx, metadata)
if err == nil {
c.AppendToChains(f)
}
return c, err
}
func (f *Fallback) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
proxy := f.findAliveProxy()
pc, err := proxy.DialUDP(metadata)
if err == nil {
pc.AppendToChains(f)
}
return pc, err
}
func (f *Fallback) SupportUDP() bool {
proxy := f.findAliveProxy()
return proxy.SupportUDP()
}
func (f *Fallback) MarshalJSON() ([]byte, error) {
var all []string
for _, proxy := range f.proxies() {
all = append(all, proxy.Name())
}
return json.Marshal(map[string]interface{}{
"type": f.Type().String(),
"now": f.Now(),
"all": all,
})
}
func (f *Fallback) Unwrap(metadata *C.Metadata) C.Proxy {
proxy := f.findAliveProxy()
return proxy
}
func (f *Fallback) proxies() []C.Proxy {
elm, _, _ := f.single.Do(func() (interface{}, error) {
return getProvidersProxies(f.providers), nil
})
return elm.([]C.Proxy)
}
func (f *Fallback) findAliveProxy() C.Proxy {
proxies := f.proxies()
for _, proxy := range proxies {
if proxy.Alive() {
return proxy
}
}
return f.proxies()[0]
}
func NewFallback(name string, providers []provider.ProxyProvider) *Fallback {
return &Fallback{
Base: outbound.NewBase(name, "", C.Fallback, false),
single: singledo.NewSingle(defaultGetProxiesDuration),
providers: providers,
}
}