mihomo/adapter/outboundgroup/fallback.go
MetaCubeX 609d69191a Merge remote-tracking branch 'clash/dev' into Alpha
# Conflicts:
#	.github/workflows/docker.yml
#	adapter/outboundgroup/fallback.go
#	adapter/outboundgroup/loadbalance.go
#	adapter/outboundgroup/relay.go
#	adapter/outboundgroup/selector.go
#	adapter/outboundgroup/urltest.go
#	config/config.go
#	go.mod
#	go.sum
#	main.go
#	test/go.mod
#	test/go.sum
2022-03-17 01:41:51 +08:00

151 lines
3.6 KiB
Go

package outboundgroup
import (
"context"
"encoding/json"
"github.com/Dreamacro/clash/log"
"go.uber.org/atomic"
"time"
"github.com/Dreamacro/clash/adapter/outbound"
"github.com/Dreamacro/clash/common/singledo"
"github.com/Dreamacro/clash/component/dialer"
C "github.com/Dreamacro/clash/constant"
"github.com/Dreamacro/clash/constant/provider"
)
type Fallback struct {
*outbound.Base
disableUDP bool
filter string
single *singledo.Single
providers []provider.ProxyProvider
failedTimes *atomic.Int32
failedTime *atomic.Int64
}
func (f *Fallback) Now() string {
proxy := f.findAliveProxy(false)
return proxy.Name()
}
// DialContext implements C.ProxyAdapter
func (f *Fallback) DialContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (C.Conn, error) {
proxy := f.findAliveProxy(true)
c, err := proxy.DialContext(ctx, metadata, f.Base.DialOptions(opts...)...)
if err == nil {
c.AppendToChains(f)
f.failedTimes.Store(-1)
f.failedTime.Store(-1)
} else {
f.onDialFailed()
}
return c, err
}
// ListenPacketContext implements C.ProxyAdapter
func (f *Fallback) ListenPacketContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (C.PacketConn, error) {
proxy := f.findAliveProxy(true)
pc, err := proxy.ListenPacketContext(ctx, metadata, f.Base.DialOptions(opts...)...)
if err == nil {
pc.AppendToChains(f)
f.failedTimes.Store(-1)
f.failedTime.Store(-1)
} else {
f.onDialFailed()
}
return pc, err
}
func (f *Fallback) onDialFailed() {
if f.failedTime.Load() == -1 {
log.Warnln("%s first failed", f.Name())
now := time.Now().UnixMilli()
f.failedTime.Store(now)
f.failedTimes.Store(1)
} else {
if f.failedTime.Load()-time.Now().UnixMilli() > 5*time.Second.Milliseconds() {
f.failedTimes.Store(-1)
f.failedTime.Store(-1)
} else {
failedCount := f.failedTimes.Inc()
log.Warnln("%s failed count: %d", f.Name(), failedCount)
if failedCount >= 5 {
log.Warnln("because %s failed multiple times, active health check", f.Name())
for _, proxyProvider := range f.providers {
go proxyProvider.HealthCheck()
}
f.failedTimes.Store(-1)
f.failedTime.Store(-1)
}
}
}
}
// SupportUDP implements C.ProxyAdapter
func (f *Fallback) SupportUDP() bool {
if f.disableUDP {
return false
}
proxy := f.findAliveProxy(false)
return proxy.SupportUDP()
}
// MarshalJSON implements C.ProxyAdapter
func (f *Fallback) MarshalJSON() ([]byte, error) {
var all []string
for _, proxy := range f.proxies(false) {
all = append(all, proxy.Name())
}
return json.Marshal(map[string]any{
"type": f.Type().String(),
"now": f.Now(),
"all": all,
})
}
// Unwrap implements C.ProxyAdapter
func (f *Fallback) Unwrap(metadata *C.Metadata) C.Proxy {
proxy := f.findAliveProxy(true)
return proxy
}
func (f *Fallback) proxies(touch bool) []C.Proxy {
elm, _, _ := f.single.Do(func() (any, error) {
return getProvidersProxies(f.providers, touch), nil
})
return elm.([]C.Proxy)
}
func (f *Fallback) findAliveProxy(touch bool) C.Proxy {
proxies := f.proxies(touch)
for _, proxy := range proxies {
if proxy.Alive() {
return proxy
}
}
return proxies[0]
}
func NewFallback(option *GroupCommonOption, providers []provider.ProxyProvider) *Fallback {
return &Fallback{
Base: outbound.NewBase(outbound.BaseOption{
Name: option.Name,
Type: C.Fallback,
Interface: option.Interface,
RoutingMark: option.RoutingMark,
}),
single: singledo.NewSingle(defaultGetProxiesDuration),
providers: providers,
disableUDP: option.DisableUDP,
filter: option.Filter,
failedTimes: atomic.NewInt32(-1),
failedTime: atomic.NewInt64(-1),
}
}