mirror of
https://github.com/MetaCubeX/mihomo.git
synced 2024-08-23 18:52:31 +00:00
247 lines
5.5 KiB
Go
247 lines
5.5 KiB
Go
package outboundgroup
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import (
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"net"
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"time"
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"github.com/Dreamacro/clash/adapter/outbound"
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"github.com/Dreamacro/clash/common/cache"
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"github.com/Dreamacro/clash/common/murmur3"
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"github.com/Dreamacro/clash/component/dialer"
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C "github.com/Dreamacro/clash/constant"
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"github.com/Dreamacro/clash/constant/provider"
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"golang.org/x/net/publicsuffix"
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)
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type strategyFn = func(proxies []C.Proxy, metadata *C.Metadata) C.Proxy
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type LoadBalance struct {
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*GroupBase
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disableUDP bool
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strategyFn strategyFn
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}
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var errStrategy = errors.New("unsupported strategy")
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func parseStrategy(config map[string]any) string {
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if strategy, ok := config["strategy"].(string); ok {
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return strategy
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}
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return "consistent-hashing"
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}
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func getKey(metadata *C.Metadata) string {
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if metadata == nil {
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return ""
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}
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if metadata.Host != "" {
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// ip host
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if ip := net.ParseIP(metadata.Host); ip != nil {
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return metadata.Host
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}
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if etld, err := publicsuffix.EffectiveTLDPlusOne(metadata.Host); err == nil {
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return etld
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}
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}
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if !metadata.DstIP.IsValid() {
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return ""
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}
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return metadata.DstIP.String()
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}
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func getKeyWithSrcAndDst(metadata *C.Metadata) string {
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dst := getKey(metadata)
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src := ""
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if metadata != nil {
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src = metadata.SrcIP.String()
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}
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return fmt.Sprintf("%s%s", src, dst)
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}
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func jumpHash(key uint64, buckets int32) int32 {
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var b, j int64
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for j < int64(buckets) {
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b = j
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key = key*2862933555777941757 + 1
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j = int64(float64(b+1) * (float64(int64(1)<<31) / float64((key>>33)+1)))
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}
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return int32(b)
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}
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// DialContext implements C.ProxyAdapter
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func (lb *LoadBalance) DialContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (c C.Conn, err error) {
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proxy := lb.Unwrap(metadata, true)
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defer func() {
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if err == nil {
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c.AppendToChains(lb)
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lb.onDialSuccess()
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} else {
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lb.onDialFailed(proxy.Type(), err)
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}
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}()
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c, err = proxy.DialContext(ctx, metadata, lb.Base.DialOptions(opts...)...)
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return
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}
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// ListenPacketContext implements C.ProxyAdapter
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func (lb *LoadBalance) ListenPacketContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (pc C.PacketConn, err error) {
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defer func() {
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if err == nil {
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pc.AppendToChains(lb)
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}
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}()
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proxy := lb.Unwrap(metadata, true)
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return proxy.ListenPacketContext(ctx, metadata, lb.Base.DialOptions(opts...)...)
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}
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// SupportUDP implements C.ProxyAdapter
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func (lb *LoadBalance) SupportUDP() bool {
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return !lb.disableUDP
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}
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func strategyRoundRobin() strategyFn {
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flag := true
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idx := 0
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return func(proxies []C.Proxy, metadata *C.Metadata) C.Proxy {
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length := len(proxies)
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for i := 0; i < length; i++ {
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flag = !flag
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if flag {
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idx = (idx - 1) % length
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} else {
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idx = (idx + 2) % length
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}
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if idx < 0 {
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idx = idx + length
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}
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proxy := proxies[idx]
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if proxy.Alive() {
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return proxy
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}
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}
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return proxies[0]
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}
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}
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func strategyConsistentHashing() strategyFn {
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maxRetry := 5
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return func(proxies []C.Proxy, metadata *C.Metadata) C.Proxy {
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key := uint64(murmur3.Sum32([]byte(getKey(metadata))))
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buckets := int32(len(proxies))
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for i := 0; i < maxRetry; i, key = i+1, key+1 {
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idx := jumpHash(key, buckets)
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proxy := proxies[idx]
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if proxy.Alive() {
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return proxy
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}
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}
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// when availability is poor, traverse the entire list to get the available nodes
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for _, proxy := range proxies {
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if proxy.Alive() {
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return proxy
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}
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}
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return proxies[0]
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}
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}
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func strategyStickySessions() strategyFn {
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ttl := time.Minute * 10
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maxRetry := 5
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lruCache := cache.New[uint64, int](
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cache.WithAge[uint64, int](int64(ttl.Seconds())),
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cache.WithSize[uint64, int](1000))
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return func(proxies []C.Proxy, metadata *C.Metadata) C.Proxy {
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key := uint64(murmur3.Sum32([]byte(getKeyWithSrcAndDst(metadata))))
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length := len(proxies)
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idx, has := lruCache.Get(key)
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if !has {
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idx = int(jumpHash(key+uint64(time.Now().UnixNano()), int32(length)))
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}
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nowIdx := idx
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for i := 1; i < maxRetry; i++ {
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proxy := proxies[nowIdx]
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if proxy.Alive() {
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if nowIdx != idx {
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lruCache.Delete(key)
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lruCache.Set(key, nowIdx)
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}
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return proxy
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} else {
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nowIdx = int(jumpHash(key+uint64(time.Now().UnixNano()), int32(length)))
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}
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}
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lruCache.Delete(key)
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lruCache.Set(key, 0)
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return proxies[0]
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}
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}
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// Unwrap implements C.ProxyAdapter
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func (lb *LoadBalance) Unwrap(metadata *C.Metadata, touch bool) C.Proxy {
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proxies := lb.GetProxies(touch)
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return lb.strategyFn(proxies, metadata)
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}
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// MarshalJSON implements C.ProxyAdapter
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func (lb *LoadBalance) MarshalJSON() ([]byte, error) {
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var all []string
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for _, proxy := range lb.GetProxies(false) {
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all = append(all, proxy.Name())
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}
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return json.Marshal(map[string]any{
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"type": lb.Type().String(),
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"all": all,
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})
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}
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func NewLoadBalance(option *GroupCommonOption, providers []provider.ProxyProvider, strategy string) (lb *LoadBalance, err error) {
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var strategyFn strategyFn
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switch strategy {
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case "consistent-hashing":
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strategyFn = strategyConsistentHashing()
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case "round-robin":
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strategyFn = strategyRoundRobin()
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case "sticky-sessions":
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strategyFn = strategyStickySessions()
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default:
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return nil, fmt.Errorf("%w: %s", errStrategy, strategy)
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}
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return &LoadBalance{
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GroupBase: NewGroupBase(GroupBaseOption{
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outbound.BaseOption{
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Name: option.Name,
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Type: C.LoadBalance,
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Interface: option.Interface,
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RoutingMark: option.RoutingMark,
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},
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option.Filter,
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option.ExcludeFilter,
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option.ExcludeType,
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providers,
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}),
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strategyFn: strategyFn,
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disableUDP: option.DisableUDP,
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}, nil
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}
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