fix proxy protocol

chain/route.go

@@ -10,6 +10,7 @@ import (
 	"github.com/go-gost/core/logger"
 	"github.com/go-gost/core/metrics"
 	"github.com/go-gost/core/selector"
+	xmetrics "github.com/go-gost/x/metrics"
 )
 
 type RouteOptions struct {
@@ -124,7 +125,7 @@ func (r *route) connect(ctx context.Context, logger logger.Logger) (conn net.Con
 				if marker != nil {
 					marker.Mark()
 				}
-				if v := metrics.GetCounter(metrics.MetricChainErrorsCounter,
+				if v := xmetrics.GetCounter(xmetrics.MetricChainErrorsCounter,
 					metrics.Labels{"chain": name, "node": node.Name}); v != nil {
 					v.Inc()
 				}
@@ -171,7 +172,7 @@ func (r *route) connect(ctx context.Context, logger logger.Logger) (conn net.Con
 		if cn, _ := r.options.Chain.(chainNamer); cn != nil {
 			name = cn.Name()
 		}
-		if v := metrics.GetObserver(metrics.MetricNodeConnectDurationObserver,
+		if v := xmetrics.GetObserver(xmetrics.MetricNodeConnectDurationObserver,
 			metrics.Labels{"chain": name, "node": node.Name}); v != nil {
 			v.Observe(time.Since(start).Seconds())
 		}

config/parsing/parse.go

@@ -35,6 +35,7 @@ const (
 	mdKeyProxyProtocol = "proxyProtocol"
 	mdKeyInterface     = "interface"
 	mdKeySoMark        = "so_mark"
+	mdKeyHash          = "hash"
 )
 
 func ParseAuther(cfg *config.AutherConfig) auth.Authenticator {
@@ -120,6 +121,8 @@ func parseChainSelector(cfg *config.SelectorConfig) selector.Selector[chain.Chai
 		strategy = xs.RandomStrategy[chain.Chainer]()
 	case "fifo", "ha":
 		strategy = xs.FIFOStrategy[chain.Chainer]()
+	case "hash":
+		strategy = xs.HashStrategy[chain.Chainer]()
 	default:
 		strategy = xs.RoundRobinStrategy[chain.Chainer]()
 	}
@@ -143,6 +146,8 @@ func parseNodeSelector(cfg *config.SelectorConfig) selector.Selector[*chain.Node
 		strategy = xs.RandomStrategy[*chain.Node]()
 	case "fifo", "ha":
 		strategy = xs.FIFOStrategy[*chain.Node]()
+	case "hash":
+		strategy = xs.HashStrategy[*chain.Node]()
 	default:
 		strategy = xs.RoundRobinStrategy[*chain.Node]()
 	}

config/parsing/service.go

@@ -20,6 +20,7 @@ import (
 	tls_util "github.com/go-gost/x/internal/util/tls"
 	"github.com/go-gost/x/metadata"
 	"github.com/go-gost/x/registry"
+	xservice "github.com/go-gost/x/service"
 )
 
 func ParseService(cfg *config.ServiceConfig) (service.Service, error) {
@@ -200,9 +201,9 @@ func ParseService(cfg *config.ServiceConfig) (service.Service, error) {
 		return nil, err
 	}
 
-	s := service.NewService(cfg.Name, ln, h,
-		service.AdmissionOption(admission.AdmissionGroup(admissions...)),
-		service.LoggerOption(serviceLogger),
+	s := xservice.NewService(cfg.Name, ln, h,
+		xservice.AdmissionOption(admission.AdmissionGroup(admissions...)),
+		xservice.LoggerOption(serviceLogger),
 	)
 
 	serviceLogger.Infof("listening on %s/%s", s.Addr().String(), s.Addr().Network())

go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d
 	github.com/gin-contrib/cors v1.3.1
 	github.com/gin-gonic/gin v1.7.7
-	github.com/go-gost/core v0.0.0-20220914115321-50d443049f3b
+	github.com/go-gost/core v0.0.0-20220928034632-6e7a8f461903
 	github.com/go-gost/gosocks4 v0.0.1
 	github.com/go-gost/gosocks5 v0.3.1-0.20211109033403-d894d75b7f09
 	github.com/go-gost/relay v0.1.1-0.20211123134818-8ef7fd81ffd7

go.sum

@@ -98,10 +98,8 @@ github.com/gin-gonic/gin v1.7.7/go.mod h1:axIBovoeJpVj8S3BwE0uPMTeReE4+AfFtqpqaZ
 github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
-github.com/go-gost/core v0.0.0-20220914115321-50d443049f3b h1:fWUPYFp0W/6GEhL0wrURGPQN2AQHhf4IZKiALJJOJh8=
-github.com/go-gost/core v0.0.0-20220914115321-50d443049f3b/go.mod h1:bHVbCS9da6XtKNYMkMUVcck5UqDDUkyC37erVfs4GXQ=
-github.com/go-gost/core v0.0.0-20220920034830-41ff9835a66d h1:UFn21xIJgWE/te12rzQA7Ymwbo+MaxOcp38K41L+Yck=
-github.com/go-gost/core v0.0.0-20220920034830-41ff9835a66d/go.mod h1:bHVbCS9da6XtKNYMkMUVcck5UqDDUkyC37erVfs4GXQ=
+github.com/go-gost/core v0.0.0-20220928034632-6e7a8f461903 h1:Ye6Ns0+Ms63vC+nbe9sBgBDTr+l+ukPX18SvEJuWXUw=
+github.com/go-gost/core v0.0.0-20220928034632-6e7a8f461903/go.mod h1:bHVbCS9da6XtKNYMkMUVcck5UqDDUkyC37erVfs4GXQ=
 github.com/go-gost/gosocks4 v0.0.1 h1:+k1sec8HlELuQV7rWftIkmy8UijzUt2I6t+iMPlGB2s=
 github.com/go-gost/gosocks4 v0.0.1/go.mod h1:3B6L47HbU/qugDg4JnoFPHgJXE43Inz8Bah1QaN9qCc=
 github.com/go-gost/gosocks5 v0.3.1-0.20211109033403-d894d75b7f09 h1:A95M6UWcfZgOuJkQ7QLfG0Hs5peWIUSysCDNz4pfe04=

handler/http/handler.go

@@ -21,6 +21,7 @@ import (
 	"github.com/go-gost/core/logger"
 	md "github.com/go-gost/core/metadata"
 	netpkg "github.com/go-gost/x/internal/net"
+	sx "github.com/go-gost/x/internal/util/selector"
 	"github.com/go-gost/x/registry"
 )
 
@@ -177,6 +178,11 @@ func (h *httpHandler) handleRequest(ctx context.Context, conn net.Conn, req *htt
 
 	req.Header.Del("Proxy-Authorization")
 
+	switch h.md.hash {
+	case "host":
+		ctx = sx.ContextWithHash(ctx, &sx.Hash{Source: addr})
+	}
+
 	cc, err := h.router.Dial(ctx, network, addr)
 	if err != nil {
 		resp.StatusCode = http.StatusServiceUnavailable

handler/http/metadata.go

@@ -12,6 +12,7 @@ type metadata struct {
 	probeResistance *probeResistance
 	enableUDP       bool
 	header          http.Header
+	hash            string
 }
 
 func (h *httpHandler) parseMetadata(md mdata.Metadata) error {
@@ -21,6 +22,7 @@ func (h *httpHandler) parseMetadata(md mdata.Metadata) error {
 		probeResistKeyX = "probe_resist"
 		knock           = "knock"
 		enableUDP       = "udp"
+		hash            = "hash"
 	)
 
 	if m := mdutil.GetStringMapString(md, header); len(m) > 0 {
@@ -45,6 +47,7 @@ func (h *httpHandler) parseMetadata(md mdata.Metadata) error {
 		}
 	}
 	h.md.enableUDP = mdutil.GetBool(md, enableUDP)
+	h.md.hash = mdutil.GetString(md, hash)
 
 	return nil
 }

handler/http2/handler.go

@@ -23,6 +23,7 @@ import (
 	"github.com/go-gost/core/logger"
 	md "github.com/go-gost/core/metadata"
 	netpkg "github.com/go-gost/x/internal/net"
+	sx "github.com/go-gost/x/internal/util/selector"
 	"github.com/go-gost/x/registry"
 )
 
@@ -157,6 +158,11 @@ func (h *http2Handler) roundTrip(ctx context.Context, w http.ResponseWriter, req
 	req.Header.Del("Proxy-Authorization")
 	req.Header.Del("Proxy-Connection")
 
+	switch h.md.hash {
+	case "host":
+		ctx = sx.ContextWithHash(ctx, &sx.Hash{Source: addr})
+	}
+
 	cc, err := h.router.Dial(ctx, "tcp", addr)
 	if err != nil {
 		log.Error(err)

handler/http2/metadata.go

@@ -11,6 +11,7 @@ import (
 type metadata struct {
 	probeResistance *probeResistance
 	header          http.Header
+	hash            string
 }
 
 func (h *http2Handler) parseMetadata(md mdata.Metadata) error {
@@ -19,6 +20,7 @@ func (h *http2Handler) parseMetadata(md mdata.Metadata) error {
 		probeResistKey  = "probeResistance"
 		probeResistKeyX = "probe_resist"
 		knock           = "knock"
+		hash            = "hash"
 	)
 
 	if m := mdutil.GetStringMapString(md, header); len(m) > 0 {
@@ -42,6 +44,7 @@ func (h *http2Handler) parseMetadata(md mdata.Metadata) error {
 			}
 		}
 	}
+	h.md.hash = mdutil.GetString(md, hash)
 
 	return nil
 }

handler/relay/connect.go

@@ -10,6 +10,7 @@ import (
 	"github.com/go-gost/core/logger"
 	"github.com/go-gost/relay"
 	netpkg "github.com/go-gost/x/internal/net"
+	sx "github.com/go-gost/x/internal/util/selector"
 )
 
 func (h *relayHandler) handleConnect(ctx context.Context, conn net.Conn, network, address string, log logger.Logger) error {
@@ -40,6 +41,10 @@ func (h *relayHandler) handleConnect(ctx context.Context, conn net.Conn, network
 		return err
 	}
 
+	switch h.md.hash {
+	case "host":
+		ctx = sx.ContextWithHash(ctx, &sx.Hash{Source: address})
+	}
 	cc, err := h.router.Dial(ctx, network, address)
 	if err != nil {
 		resp.Status = relay.StatusNetworkUnreachable

handler/relay/metadata.go

@@ -13,6 +13,7 @@ type metadata struct {
 	enableBind    bool
 	udpBufferSize int
 	noDelay       bool
+	hash          string
 }
 
 func (h *relayHandler) parseMetadata(md mdata.Metadata) (err error) {
@@ -21,6 +22,7 @@ func (h *relayHandler) parseMetadata(md mdata.Metadata) (err error) {
 		enableBind    = "bind"
 		udpBufferSize = "udpBufferSize"
 		noDelay       = "nodelay"
+		hash          = "hash"
 	)
 
 	h.md.readTimeout = mdutil.GetDuration(md, readTimeout)
@@ -32,5 +34,7 @@ func (h *relayHandler) parseMetadata(md mdata.Metadata) (err error) {
 	} else {
 		h.md.udpBufferSize = 1500
 	}
+
+	h.md.hash = mdutil.GetString(md, hash)
 	return
 }

handler/sni/handler.go

@@ -21,6 +21,7 @@ import (
 	md "github.com/go-gost/core/metadata"
 	dissector "github.com/go-gost/tls-dissector"
 	netpkg "github.com/go-gost/x/internal/net"
+	sx "github.com/go-gost/x/internal/util/selector"
 	"github.com/go-gost/x/registry"
 )
 
@@ -121,6 +122,11 @@ func (h *sniHandler) handleHTTP(ctx context.Context, rw io.ReadWriter, raddr net
 		return nil
 	}
 
+	switch h.md.hash {
+	case "host":
+		ctx = sx.ContextWithHash(ctx, &sx.Hash{Source: host})
+	}
+
 	cc, err := h.router.Dial(ctx, "tcp", host)
 	if err != nil {
 		log.Error(err)
@@ -179,6 +185,11 @@ func (h *sniHandler) handleHTTPS(ctx context.Context, rw io.ReadWriter, raddr ne
 		return nil
 	}
 
+	switch h.md.hash {
+	case "host":
+		ctx = sx.ContextWithHash(ctx, &sx.Hash{Source: host})
+	}
+
 	cc, err := h.router.Dial(ctx, "tcp", host)
 	if err != nil {
 		log.Error(err)

handler/sni/metadata.go

@@ -9,13 +9,16 @@ import (
 
 type metadata struct {
 	readTimeout time.Duration
+	hash        string
 }
 
 func (h *sniHandler) parseMetadata(md mdata.Metadata) (err error) {
 	const (
 		readTimeout = "readTimeout"
+		hash        = "hash"
 	)
 
 	h.md.readTimeout = mdutil.GetDuration(md, readTimeout)
+	h.md.hash = mdutil.GetString(md, hash)
 	return
 }

handler/socks/v4/handler.go

@@ -12,6 +12,7 @@ import (
 	md "github.com/go-gost/core/metadata"
 	"github.com/go-gost/gosocks4"
 	netpkg "github.com/go-gost/x/internal/net"
+	sx "github.com/go-gost/x/internal/util/selector"
 	"github.com/go-gost/x/registry"
 )
 
@@ -123,6 +124,11 @@ func (h *socks4Handler) handleConnect(ctx context.Context, conn net.Conn, req *g
 		return resp.Write(conn)
 	}
 
+	switch h.md.hash {
+	case "host":
+		ctx = sx.ContextWithHash(ctx, &sx.Hash{Source: addr})
+	}
+
 	cc, err := h.router.Dial(ctx, "tcp", addr)
 	if err != nil {
 		resp := gosocks4.NewReply(gosocks4.Failed, nil)

handler/socks/v4/metadata.go

@@ -9,13 +9,16 @@ import (
 
 type metadata struct {
 	readTimeout time.Duration
+	hash        string
 }
 
 func (h *socks4Handler) parseMetadata(md mdata.Metadata) (err error) {
 	const (
 		readTimeout = "readTimeout"
+		hash        = "hash"
 	)
 
 	h.md.readTimeout = mdutil.GetDuration(md, readTimeout)
+	h.md.hash = mdutil.GetString(md, hash)
 	return
 }

handler/socks/v5/connect.go

@@ -9,6 +9,7 @@ import (
 	"github.com/go-gost/core/logger"
 	"github.com/go-gost/gosocks5"
 	netpkg "github.com/go-gost/x/internal/net"
+	sx "github.com/go-gost/x/internal/util/selector"
 )
 
 func (h *socks5Handler) handleConnect(ctx context.Context, conn net.Conn, network, address string, log logger.Logger) error {
@@ -25,6 +26,11 @@ func (h *socks5Handler) handleConnect(ctx context.Context, conn net.Conn, networ
 		return resp.Write(conn)
 	}
 
+	switch h.md.hash {
+	case "host":
+		ctx = sx.ContextWithHash(ctx, &sx.Hash{Source: address})
+	}
+
 	cc, err := h.router.Dial(ctx, network, address)
 	if err != nil {
 		resp := gosocks5.NewReply(gosocks5.NetUnreachable, nil)

handler/socks/v5/metadata.go

@@ -15,6 +15,7 @@ type metadata struct {
 	enableUDP         bool
 	udpBufferSize     int
 	compatibilityMode bool
+	hash              string
 }
 
 func (h *socks5Handler) parseMetadata(md mdata.Metadata) (err error) {
@@ -25,6 +26,7 @@ func (h *socks5Handler) parseMetadata(md mdata.Metadata) (err error) {
 		enableUDP         = "udp"
 		udpBufferSize     = "udpBufferSize"
 		compatibilityMode = "comp"
+		hash              = "hash"
 	)
 
 	h.md.readTimeout = mdutil.GetDuration(md, readTimeout)
@@ -39,6 +41,7 @@ func (h *socks5Handler) parseMetadata(md mdata.Metadata) (err error) {
 	}
 
 	h.md.compatibilityMode = mdutil.GetBool(md, compatibilityMode)
+	h.md.hash = mdutil.GetString(md, hash)
 
 	return nil
 }

handler/ss/handler.go

@@ -12,6 +12,7 @@ import (
 	md "github.com/go-gost/core/metadata"
 	"github.com/go-gost/gosocks5"
 	netpkg "github.com/go-gost/x/internal/net"
+	sx "github.com/go-gost/x/internal/util/selector"
 	"github.com/go-gost/x/internal/util/ss"
 	"github.com/go-gost/x/registry"
 	"github.com/shadowsocks/go-shadowsocks2/core"
@@ -106,6 +107,11 @@ func (h *ssHandler) Handle(ctx context.Context, conn net.Conn, opts ...handler.H
 		return nil
 	}
 
+	switch h.md.hash {
+	case "host":
+		ctx = sx.ContextWithHash(ctx, &sx.Hash{Source: addr.String()})
+	}
+
 	cc, err := h.router.Dial(ctx, "tcp", addr.String())
 	if err != nil {
 		return err

handler/ss/metadata.go

@@ -10,16 +10,19 @@ import (
 type metadata struct {
 	key         string
 	readTimeout time.Duration
+	hash        string
 }
 
 func (h *ssHandler) parseMetadata(md mdata.Metadata) (err error) {
 	const (
 		key         = "key"
 		readTimeout = "readTimeout"
+		hash        = "hash"
 	)
 
 	h.md.key = mdutil.GetString(md, key)
 	h.md.readTimeout = mdutil.GetDuration(md, readTimeout)
+	h.md.hash = mdutil.GetString(md, hash)
 
 	return
 }

internal/util/selector/key.go

@@ -8,7 +8,6 @@ type hashKey struct{}
 
 type Hash struct {
 	Source string
-	Value  int
 }
 
 var (

listener/grpc/listener.go

@@ -58,10 +58,10 @@ func (l *grpcListener) Init(md md.Metadata) (err error) {
 		return
 	}
 	ln = metrics.WrapListener(l.options.Service, ln)
+	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 	ln = admission.WrapListener(l.options.Admission, ln)
 	ln = limiter.WrapListener(l.options.TrafficLimiter, ln)
 	ln = climiter.WrapListener(l.options.ConnLimiter, ln)
-	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 
 	var opts []grpc.ServerOption
 	if !l.md.insecure {

listener/http2/h2/listener.go

@@ -80,10 +80,10 @@ func (l *h2Listener) Init(md md.Metadata) (err error) {
 	}
 	l.addr = ln.Addr()
 	ln = metrics.WrapListener(l.options.Service, ln)
+	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 	ln = admission.WrapListener(l.options.Admission, ln)
 	ln = limiter.WrapListener(l.options.TrafficLimiter, ln)
 	ln = climiter.WrapListener(l.options.ConnLimiter, ln)
-	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 
 	if l.h2c {
 		l.server.Handler = h2c.NewHandler(

listener/http2/listener.go

@@ -69,10 +69,10 @@ func (l *http2Listener) Init(md md.Metadata) (err error) {
 	}
 	l.addr = ln.Addr()
 	ln = metrics.WrapListener(l.options.Service, ln)
+	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 	ln = admission.WrapListener(l.options.Admission, ln)
 	ln = limiter.WrapListener(l.options.TrafficLimiter, ln)
 	ln = climiter.WrapListener(l.options.ConnLimiter, ln)
-	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 
 	ln = tls.NewListener(
 		ln,

listener/mtls/listener.go

@@ -57,10 +57,10 @@ func (l *mtlsListener) Init(md md.Metadata) (err error) {
 	}
 
 	ln = metrics.WrapListener(l.options.Service, ln)
+	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 	ln = admission.WrapListener(l.options.Admission, ln)
 	ln = limiter.WrapListener(l.options.TrafficLimiter, ln)
 	ln = climiter.WrapListener(l.options.ConnLimiter, ln)
-	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 	l.Listener = tls.NewListener(ln, l.options.TLSConfig)
 
 	l.cqueue = make(chan net.Conn, l.md.backlog)

listener/mws/listener.go

@@ -99,10 +99,10 @@ func (l *mwsListener) Init(md md.Metadata) (err error) {
 		return
 	}
 	ln = metrics.WrapListener(l.options.Service, ln)
+	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 	ln = admission.WrapListener(l.options.Admission, ln)
 	ln = limiter.WrapListener(l.options.TrafficLimiter, ln)
 	ln = climiter.WrapListener(l.options.ConnLimiter, ln)
-	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 
 	if l.tlsEnabled {
 		ln = tls.NewListener(ln, l.options.TLSConfig)

listener/obfs/http/listener.go

@@ -53,10 +53,10 @@ func (l *obfsListener) Init(md md.Metadata) (err error) {
 		return
 	}
 	ln = metrics.WrapListener(l.options.Service, ln)
+	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 	ln = admission.WrapListener(l.options.Admission, ln)
 	ln = limiter.WrapListener(l.options.TrafficLimiter, ln)
 	ln = climiter.WrapListener(l.options.ConnLimiter, ln)
-	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 
 	l.Listener = ln
 	return

listener/obfs/tls/listener.go

@@ -52,10 +52,10 @@ func (l *obfsListener) Init(md md.Metadata) (err error) {
 		return
 	}
 	ln = metrics.WrapListener(l.options.Service, ln)
+	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 	ln = admission.WrapListener(l.options.Admission, ln)
 	ln = limiter.WrapListener(l.options.TrafficLimiter, ln)
 	ln = climiter.WrapListener(l.options.ConnLimiter, ln)
-	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 
 	l.Listener = ln
 	return

listener/redirect/tcp/listener.go

@@ -60,10 +60,10 @@ func (l *redirectListener) Init(md md.Metadata) (err error) {
 	}
 
 	ln = metrics.WrapListener(l.options.Service, ln)
+	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 	ln = admission.WrapListener(l.options.Admission, ln)
 	ln = limiter.WrapListener(l.options.TrafficLimiter, ln)
 	ln = climiter.WrapListener(l.options.ConnLimiter, ln)
-	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 	l.ln = ln
 	return
 }

listener/ssh/listener.go

@@ -59,10 +59,10 @@ func (l *sshListener) Init(md md.Metadata) (err error) {
 	}
 
 	ln = metrics.WrapListener(l.options.Service, ln)
+	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 	ln = admission.WrapListener(l.options.Admission, ln)
 	ln = limiter.WrapListener(l.options.TrafficLimiter, ln)
 	ln = climiter.WrapListener(l.options.ConnLimiter, ln)
-	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 	l.Listener = ln
 
 	config := &ssh.ServerConfig{

listener/sshd/listener.go

@@ -68,10 +68,10 @@ func (l *sshdListener) Init(md md.Metadata) (err error) {
 	}
 
 	ln = metrics.WrapListener(l.options.Service, ln)
+	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 	ln = admission.WrapListener(l.options.Admission, ln)
 	ln = limiter.WrapListener(l.options.TrafficLimiter, ln)
 	ln = climiter.WrapListener(l.options.ConnLimiter, ln)
-	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 	l.Listener = ln
 
 	config := &ssh.ServerConfig{

listener/tcp/listener.go

@@ -55,10 +55,10 @@ func (l *tcpListener) Init(md md.Metadata) (err error) {
 	l.logger.Debugf("pp: %d", l.options.ProxyProtocol)
 
 	ln = metrics.WrapListener(l.options.Service, ln)
+	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 	ln = admission.WrapListener(l.options.Admission, ln)
 	ln = limiter.WrapListener(l.options.TrafficLimiter, ln)
 	ln = climiter.WrapListener(l.options.ConnLimiter, ln)
-	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 	l.ln = ln
 
 	return

listener/tls/listener.go

@@ -53,10 +53,10 @@ func (l *tlsListener) Init(md md.Metadata) (err error) {
 		return
 	}
 	ln = metrics.WrapListener(l.options.Service, ln)
+	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 	ln = admission.WrapListener(l.options.Admission, ln)
 	ln = limiter.WrapListener(l.options.TrafficLimiter, ln)
 	ln = climiter.WrapListener(l.options.ConnLimiter, ln)
-	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 
 	l.ln = tls.NewListener(ln, l.options.TLSConfig)
 

listener/ws/listener.go

@@ -94,10 +94,10 @@ func (l *wsListener) Init(md md.Metadata) (err error) {
 		return
 	}
 	ln = metrics.WrapListener(l.options.Service, ln)
+	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 	ln = admission.WrapListener(l.options.Admission, ln)
 	ln = limiter.WrapListener(l.options.TrafficLimiter, ln)
 	ln = climiter.WrapListener(l.options.ConnLimiter, ln)
-	ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
 
 	if l.tlsEnabled {
 		ln = tls.NewListener(ln, l.options.TLSConfig)

metrics/metrics.go

@@ -1,135 +1,52 @@
 package metrics
 
-import (
-	"os"
+import "github.com/go-gost/core/metrics"
 
-	"github.com/go-gost/core/metrics"
-	"github.com/prometheus/client_golang/prometheus"
+const (
+	// Number of services. Labels: host.
+	MetricServicesGauge metrics.MetricName = "gost_services"
+	// Total service requests. Labels: host, service.
+	MetricServiceRequestsCounter metrics.MetricName = "gost_service_requests_total"
+	// Number of in-flight requests. Labels: host, service.
+	MetricServiceRequestsInFlightGauge metrics.MetricName = "gost_service_requests_in_flight"
+	// Request duration historgram. Labels: host, service.
+	MetricServiceRequestsDurationObserver metrics.MetricName = "gost_service_request_duration_seconds"
+	// Total service input data transfer size in bytes. Labels: host, service.
+	MetricServiceTransferInputBytesCounter metrics.MetricName = "gost_service_transfer_input_bytes_total"
+	// Total service output data transfer size in bytes. Labels: host, service.
+	MetricServiceTransferOutputBytesCounter metrics.MetricName = "gost_service_transfer_output_bytes_total"
+	// Chain node connect duration histogram. Labels: host, chain, node.
+	MetricNodeConnectDurationObserver metrics.MetricName = "gost_chain_node_connect_duration_seconds"
+	// Total service handler errors. Labels: host, service.
+	MetricServiceHandlerErrorsCounter metrics.MetricName = "gost_service_handler_errors_total"
+	// Total chain connect errors. Labels: host, chain, node.
+	MetricChainErrorsCounter metrics.MetricName = "gost_chain_errors_total"
 )
 
-type promMetrics struct {
-	host       string
-	gauges     map[metrics.MetricName]*prometheus.GaugeVec
-	counters   map[metrics.MetricName]*prometheus.CounterVec
-	histograms map[metrics.MetricName]*prometheus.HistogramVec
+var (
+	global metrics.Metrics = Noop()
+)
+
+func Init(m metrics.Metrics) {
+	if m != nil {
+		global = m
+	} else {
+		global = Noop()
+	}
 }
 
-func NewMetrics() metrics.Metrics {
-	host, _ := os.Hostname()
-	m := &promMetrics{
-		host: host,
-		gauges: map[metrics.MetricName]*prometheus.GaugeVec{
-			metrics.MetricServicesGauge: prometheus.NewGaugeVec(
-				prometheus.GaugeOpts{
-					Name: string(metrics.MetricServicesGauge),
-					Help: "Current number of services",
-				},
-				[]string{"host"}),
-			metrics.MetricServiceRequestsInFlightGauge: prometheus.NewGaugeVec(
-				prometheus.GaugeOpts{
-					Name: string(metrics.MetricServiceRequestsInFlightGauge),
-					Help: "Current in-flight requests",
-				},
-				[]string{"host", "service"}),
-		},
-		counters: map[metrics.MetricName]*prometheus.CounterVec{
-			metrics.MetricServiceRequestsCounter: prometheus.NewCounterVec(
-				prometheus.CounterOpts{
-					Name: string(metrics.MetricServiceRequestsCounter),
-					Help: "Total number of requests",
-				},
-				[]string{"host", "service"}),
-			metrics.MetricServiceTransferInputBytesCounter: prometheus.NewCounterVec(
-				prometheus.CounterOpts{
-					Name: string(metrics.MetricServiceTransferInputBytesCounter),
-					Help: "Total service input data transfer size in bytes",
-				},
-				[]string{"host", "service"}),
-			metrics.MetricServiceTransferOutputBytesCounter: prometheus.NewCounterVec(
-				prometheus.CounterOpts{
-					Name: string(metrics.MetricServiceTransferOutputBytesCounter),
-					Help: "Total service output data transfer size in bytes",
-				},
-				[]string{"host", "service"}),
-			metrics.MetricServiceHandlerErrorsCounter: prometheus.NewCounterVec(
-				prometheus.CounterOpts{
-					Name: string(metrics.MetricServiceHandlerErrorsCounter),
-					Help: "Total service handler errors",
-				},
-				[]string{"host", "service"}),
-			metrics.MetricChainErrorsCounter: prometheus.NewCounterVec(
-				prometheus.CounterOpts{
-					Name: string(metrics.MetricChainErrorsCounter),
-					Help: "Total chain errors",
-				},
-				[]string{"host", "chain", "node"}),
-		},
-		histograms: map[metrics.MetricName]*prometheus.HistogramVec{
-			metrics.MetricServiceRequestsDurationObserver: prometheus.NewHistogramVec(
-				prometheus.HistogramOpts{
-					Name: string(metrics.MetricServiceRequestsDurationObserver),
-					Help: "Distribution of request latencies",
-					Buckets: []float64{
-						.005, .01, .025, .05, .1, .25, .5, 1, 2.5, 5, 10, 15, 30, 60,
-					},
-				},
-				[]string{"host", "service"}),
-			metrics.MetricNodeConnectDurationObserver: prometheus.NewHistogramVec(
-				prometheus.HistogramOpts{
-					Name: string(metrics.MetricNodeConnectDurationObserver),
-					Help: "Distribution of chain node connect latencies",
-					Buckets: []float64{
-						.01, .05, .1, .25, .5, 1, 1.5, 2, 5, 10, 15, 30, 60,
-					},
-				},
-				[]string{"host", "chain", "node"}),
-		},
-	}
-	for k := range m.gauges {
-		prometheus.MustRegister(m.gauges[k])
-	}
-	for k := range m.counters {
-		prometheus.MustRegister(m.counters[k])
-	}
-	for k := range m.histograms {
-		prometheus.MustRegister(m.histograms[k])
-	}
-
-	return m
+func IsEnabled() bool {
+	return global != Noop()
 }
 
-func (m *promMetrics) Gauge(name metrics.MetricName, labels metrics.Labels) metrics.Gauge {
-	v, ok := m.gauges[name]
-	if !ok {
-		return nil
-	}
-	if labels == nil {
-		labels = metrics.Labels{}
-	}
-	labels["host"] = m.host
-	return v.With(prometheus.Labels(labels))
+func GetCounter(name metrics.MetricName, labels metrics.Labels) metrics.Counter {
+	return global.Counter(name, labels)
 }
 
-func (m *promMetrics) Counter(name metrics.MetricName, labels metrics.Labels) metrics.Counter {
-	v, ok := m.counters[name]
-	if !ok {
-		return nil
-	}
-	if labels == nil {
-		labels = metrics.Labels{}
-	}
-	labels["host"] = m.host
-	return v.With(prometheus.Labels(labels))
+func GetGauge(name metrics.MetricName, labels metrics.Labels) metrics.Gauge {
+	return global.Gauge(name, labels)
 }
 
-func (m *promMetrics) Observer(name metrics.MetricName, labels metrics.Labels) metrics.Observer {
-	v, ok := m.histograms[name]
-	if !ok {
-		return nil
-	}
-	if labels == nil {
-		labels = metrics.Labels{}
-	}
-	labels["host"] = m.host
-	return v.With(prometheus.Labels(labels))
+func GetObserver(name metrics.MetricName, labels metrics.Labels) metrics.Observer {
+	return global.Observer(name, labels)
 }

metrics/noop.go

@@ -0,0 +1,45 @@
+package metrics
+
+import "github.com/go-gost/core/metrics"
+
+var (
+	nopGauge    = &noopGauge{}
+	nopCounter  = &noopCounter{}
+	nopObserver = &noopObserver{}
+
+	noop metrics.Metrics = &noopMetrics{}
+)
+
+type noopMetrics struct{}
+
+func Noop() metrics.Metrics {
+	return noop
+}
+
+func (m *noopMetrics) Counter(name metrics.MetricName, labels metrics.Labels) metrics.Counter {
+	return nopCounter
+}
+
+func (m *noopMetrics) Gauge(name metrics.MetricName, labels metrics.Labels) metrics.Gauge {
+	return nopGauge
+}
+
+func (m *noopMetrics) Observer(name metrics.MetricName, labels metrics.Labels) metrics.Observer {
+	return nopObserver
+}
+
+type noopGauge struct{}
+
+func (*noopGauge) Inc()          {}
+func (*noopGauge) Dec()          {}
+func (*noopGauge) Add(v float64) {}
+func (*noopGauge) Set(v float64) {}
+
+type noopCounter struct{}
+
+func (*noopCounter) Inc()          {}
+func (*noopCounter) Add(v float64) {}
+
+type noopObserver struct{}
+
+func (*noopObserver) Observe(v float64) {}

metrics/prom.go

@@ -0,0 +1,135 @@
+package metrics
+
+import (
+	"os"
+
+	"github.com/go-gost/core/metrics"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+type promMetrics struct {
+	host       string
+	gauges     map[metrics.MetricName]*prometheus.GaugeVec
+	counters   map[metrics.MetricName]*prometheus.CounterVec
+	histograms map[metrics.MetricName]*prometheus.HistogramVec
+}
+
+func NewMetrics() metrics.Metrics {
+	host, _ := os.Hostname()
+	m := &promMetrics{
+		host: host,
+		gauges: map[metrics.MetricName]*prometheus.GaugeVec{
+			MetricServicesGauge: prometheus.NewGaugeVec(
+				prometheus.GaugeOpts{
+					Name: string(MetricServicesGauge),
+					Help: "Current number of services",
+				},
+				[]string{"host"}),
+			MetricServiceRequestsInFlightGauge: prometheus.NewGaugeVec(
+				prometheus.GaugeOpts{
+					Name: string(MetricServiceRequestsInFlightGauge),
+					Help: "Current in-flight requests",
+				},
+				[]string{"host", "service"}),
+		},
+		counters: map[metrics.MetricName]*prometheus.CounterVec{
+			MetricServiceRequestsCounter: prometheus.NewCounterVec(
+				prometheus.CounterOpts{
+					Name: string(MetricServiceRequestsCounter),
+					Help: "Total number of requests",
+				},
+				[]string{"host", "service"}),
+			MetricServiceTransferInputBytesCounter: prometheus.NewCounterVec(
+				prometheus.CounterOpts{
+					Name: string(MetricServiceTransferInputBytesCounter),
+					Help: "Total service input data transfer size in bytes",
+				},
+				[]string{"host", "service"}),
+			MetricServiceTransferOutputBytesCounter: prometheus.NewCounterVec(
+				prometheus.CounterOpts{
+					Name: string(MetricServiceTransferOutputBytesCounter),
+					Help: "Total service output data transfer size in bytes",
+				},
+				[]string{"host", "service"}),
+			MetricServiceHandlerErrorsCounter: prometheus.NewCounterVec(
+				prometheus.CounterOpts{
+					Name: string(MetricServiceHandlerErrorsCounter),
+					Help: "Total service handler errors",
+				},
+				[]string{"host", "service"}),
+			MetricChainErrorsCounter: prometheus.NewCounterVec(
+				prometheus.CounterOpts{
+					Name: string(MetricChainErrorsCounter),
+					Help: "Total chain errors",
+				},
+				[]string{"host", "chain", "node"}),
+		},
+		histograms: map[metrics.MetricName]*prometheus.HistogramVec{
+			MetricServiceRequestsDurationObserver: prometheus.NewHistogramVec(
+				prometheus.HistogramOpts{
+					Name: string(MetricServiceRequestsDurationObserver),
+					Help: "Distribution of request latencies",
+					Buckets: []float64{
+						.005, .01, .025, .05, .1, .25, .5, 1, 2.5, 5, 10, 15, 30, 60,
+					},
+				},
+				[]string{"host", "service"}),
+			MetricNodeConnectDurationObserver: prometheus.NewHistogramVec(
+				prometheus.HistogramOpts{
+					Name: string(MetricNodeConnectDurationObserver),
+					Help: "Distribution of chain node connect latencies",
+					Buckets: []float64{
+						.01, .05, .1, .25, .5, 1, 1.5, 2, 5, 10, 15, 30, 60,
+					},
+				},
+				[]string{"host", "chain", "node"}),
+		},
+	}
+	for k := range m.gauges {
+		prometheus.MustRegister(m.gauges[k])
+	}
+	for k := range m.counters {
+		prometheus.MustRegister(m.counters[k])
+	}
+	for k := range m.histograms {
+		prometheus.MustRegister(m.histograms[k])
+	}
+
+	return m
+}
+
+func (m *promMetrics) Gauge(name metrics.MetricName, labels metrics.Labels) metrics.Gauge {
+	v, ok := m.gauges[name]
+	if !ok {
+		return nil
+	}
+	if labels == nil {
+		labels = metrics.Labels{}
+	}
+	labels["host"] = m.host
+	return v.With(prometheus.Labels(labels))
+}
+
+func (m *promMetrics) Counter(name metrics.MetricName, labels metrics.Labels) metrics.Counter {
+	v, ok := m.counters[name]
+	if !ok {
+		return nil
+	}
+	if labels == nil {
+		labels = metrics.Labels{}
+	}
+	labels["host"] = m.host
+	return v.With(prometheus.Labels(labels))
+}
+
+func (m *promMetrics) Observer(name metrics.MetricName, labels metrics.Labels) metrics.Observer {
+	v, ok := m.histograms[name]
+	if !ok {
+		return nil
+	}
+	if labels == nil {
+		labels = metrics.Labels{}
+	}
+	labels["host"] = m.host
+	return v.With(prometheus.Labels(labels))
+}

metrics/service/service.go

@@ -4,6 +4,7 @@ import (
 	"net"
 	"net/http"
 
+	"github.com/go-gost/core/service"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
 
@@ -23,12 +24,12 @@ func PathOption(path string) Option {
 	}
 }
 
-type Service struct {
+type metricService struct {
 	s  *http.Server
 	ln net.Listener
 }
 
-func NewService(addr string, opts ...Option) (*Service, error) {
+func NewService(addr string, opts ...Option) (service.Service, error) {
 	ln, err := net.Listen("tcp", addr)
 	if err != nil {
 		return nil, err
@@ -44,7 +45,7 @@ func NewService(addr string, opts ...Option) (*Service, error) {
 
 	mux := http.NewServeMux()
 	mux.Handle(options.path, promhttp.Handler())
-	return &Service{
+	return &metricService{
 		s: &http.Server{
 			Handler: mux,
 		},
@@ -52,14 +53,14 @@ func NewService(addr string, opts ...Option) (*Service, error) {
 	}, nil
 }
 
-func (s *Service) Serve() error {
+func (s *metricService) Serve() error {
 	return s.s.Serve(s.ln)
 }
 
-func (s *Service) Addr() net.Addr {
+func (s *metricService) Addr() net.Addr {
 	return s.ln.Addr()
 }
 
-func (s *Service) Close() error {
+func (s *metricService) Close() error {
 	return s.s.Close()
 }

metrics/wrapper/conn.go

@@ -9,6 +9,7 @@ import (
 	"github.com/go-gost/core/metrics"
 	xnet "github.com/go-gost/x/internal/net"
 	"github.com/go-gost/x/internal/net/udp"
+	xmetrics "github.com/go-gost/x/metrics"
 )
 
 var (
@@ -22,7 +23,7 @@ type serverConn struct {
 }
 
 func WrapConn(service string, c net.Conn) net.Conn {
-	if !metrics.IsEnabled() {
+	if !xmetrics.IsEnabled() {
 		return c
 	}
 	return &serverConn{
@@ -33,8 +34,8 @@ func WrapConn(service string, c net.Conn) net.Conn {
 
 func (c *serverConn) Read(b []byte) (n int, err error) {
 	n, err = c.Conn.Read(b)
-	if counter := metrics.GetCounter(
-		metrics.MetricServiceTransferInputBytesCounter,
+	if counter := xmetrics.GetCounter(
+		xmetrics.MetricServiceTransferInputBytesCounter,
 		metrics.Labels{
 			"service": c.service,
 		}); counter != nil {
@@ -45,8 +46,8 @@ func (c *serverConn) Read(b []byte) (n int, err error) {
 
 func (c *serverConn) Write(b []byte) (n int, err error) {
 	n, err = c.Conn.Write(b)
-	if counter := metrics.GetCounter(
-		metrics.MetricServiceTransferOutputBytesCounter,
+	if counter := xmetrics.GetCounter(
+		xmetrics.MetricServiceTransferOutputBytesCounter,
 		metrics.Labels{
 			"service": c.service,
 		}); counter != nil {
@@ -70,7 +71,7 @@ type packetConn struct {
 }
 
 func WrapPacketConn(service string, pc net.PacketConn) net.PacketConn {
-	if !metrics.IsEnabled() {
+	if !xmetrics.IsEnabled() {
 		return pc
 	}
 	return &packetConn{
@@ -81,8 +82,8 @@ func WrapPacketConn(service string, pc net.PacketConn) net.PacketConn {
 
 func (c *packetConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
 	n, addr, err = c.PacketConn.ReadFrom(p)
-	if counter := metrics.GetCounter(
-		metrics.MetricServiceTransferInputBytesCounter,
+	if counter := xmetrics.GetCounter(
+		xmetrics.MetricServiceTransferInputBytesCounter,
 		metrics.Labels{
 			"service": c.service,
 		}); counter != nil {
@@ -93,8 +94,8 @@ func (c *packetConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
 
 func (c *packetConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
 	n, err = c.PacketConn.WriteTo(p, addr)
-	if counter := metrics.GetCounter(
-		metrics.MetricServiceTransferOutputBytesCounter,
+	if counter := xmetrics.GetCounter(
+		xmetrics.MetricServiceTransferOutputBytesCounter,
 		metrics.Labels{
 			"service": c.service,
 		}); counter != nil {
@@ -139,8 +140,8 @@ func (c *udpConn) SetWriteBuffer(n int) error {
 func (c *udpConn) Read(b []byte) (n int, err error) {
 	if nc, ok := c.PacketConn.(io.Reader); ok {
 		n, err = nc.Read(b)
-		if counter := metrics.GetCounter(
-			metrics.MetricServiceTransferInputBytesCounter,
+		if counter := xmetrics.GetCounter(
+			xmetrics.MetricServiceTransferInputBytesCounter,
 			metrics.Labels{
 				"service": c.service,
 			}); counter != nil {
@@ -154,8 +155,8 @@ func (c *udpConn) Read(b []byte) (n int, err error) {
 
 func (c *udpConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
 	n, addr, err = c.PacketConn.ReadFrom(p)
-	if counter := metrics.GetCounter(
-		metrics.MetricServiceTransferInputBytesCounter,
+	if counter := xmetrics.GetCounter(
+		xmetrics.MetricServiceTransferInputBytesCounter,
 		metrics.Labels{
 			"service": c.service,
 		}); counter != nil {
@@ -167,8 +168,8 @@ func (c *udpConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
 func (c *udpConn) ReadFromUDP(b []byte) (n int, addr *net.UDPAddr, err error) {
 	if nc, ok := c.PacketConn.(udp.ReadUDP); ok {
 		n, addr, err = nc.ReadFromUDP(b)
-		if counter := metrics.GetCounter(
-			metrics.MetricServiceTransferInputBytesCounter,
+		if counter := xmetrics.GetCounter(
+			xmetrics.MetricServiceTransferInputBytesCounter,
 			metrics.Labels{
 				"service": c.service,
 			}); counter != nil {
@@ -183,8 +184,8 @@ func (c *udpConn) ReadFromUDP(b []byte) (n int, addr *net.UDPAddr, err error) {
 func (c *udpConn) ReadMsgUDP(b, oob []byte) (n, oobn, flags int, addr *net.UDPAddr, err error) {
 	if nc, ok := c.PacketConn.(udp.ReadUDP); ok {
 		n, oobn, flags, addr, err = nc.ReadMsgUDP(b, oob)
-		if counter := metrics.GetCounter(
-			metrics.MetricServiceTransferInputBytesCounter,
+		if counter := xmetrics.GetCounter(
+			xmetrics.MetricServiceTransferInputBytesCounter,
 			metrics.Labels{
 				"service": c.service,
 			}); counter != nil {
@@ -199,8 +200,8 @@ func (c *udpConn) ReadMsgUDP(b, oob []byte) (n, oobn, flags int, addr *net.UDPAd
 func (c *udpConn) Write(b []byte) (n int, err error) {
 	if nc, ok := c.PacketConn.(io.Writer); ok {
 		n, err = nc.Write(b)
-		if counter := metrics.GetCounter(
-			metrics.MetricServiceTransferOutputBytesCounter,
+		if counter := xmetrics.GetCounter(
+			xmetrics.MetricServiceTransferOutputBytesCounter,
 			metrics.Labels{
 				"service": c.service,
 			}); counter != nil {
@@ -214,8 +215,8 @@ func (c *udpConn) Write(b []byte) (n int, err error) {
 
 func (c *udpConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
 	n, err = c.PacketConn.WriteTo(p, addr)
-	if counter := metrics.GetCounter(
-		metrics.MetricServiceTransferOutputBytesCounter,
+	if counter := xmetrics.GetCounter(
+		xmetrics.MetricServiceTransferOutputBytesCounter,
 		metrics.Labels{
 			"service": c.service,
 		}); counter != nil {
@@ -227,8 +228,8 @@ func (c *udpConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
 func (c *udpConn) WriteToUDP(b []byte, addr *net.UDPAddr) (n int, err error) {
 	if nc, ok := c.PacketConn.(udp.WriteUDP); ok {
 		n, err = nc.WriteToUDP(b, addr)
-		if counter := metrics.GetCounter(
-			metrics.MetricServiceTransferOutputBytesCounter,
+		if counter := xmetrics.GetCounter(
+			xmetrics.MetricServiceTransferOutputBytesCounter,
 			metrics.Labels{
 				"service": c.service,
 			}); counter != nil {
@@ -243,8 +244,8 @@ func (c *udpConn) WriteToUDP(b []byte, addr *net.UDPAddr) (n int, err error) {
 func (c *udpConn) WriteMsgUDP(b, oob []byte, addr *net.UDPAddr) (n, oobn int, err error) {
 	if nc, ok := c.PacketConn.(udp.WriteUDP); ok {
 		n, oobn, err = nc.WriteMsgUDP(b, oob, addr)
-		if counter := metrics.GetCounter(
-			metrics.MetricServiceTransferOutputBytesCounter,
+		if counter := xmetrics.GetCounter(
+			xmetrics.MetricServiceTransferOutputBytesCounter,
 			metrics.Labels{
 				"service": c.service,
 			}); counter != nil {

metrics/wrapper/listener.go

@@ -3,7 +3,7 @@ package wrapper
 import (
 	"net"
 
-	"github.com/go-gost/core/metrics"
+	xmetrics "github.com/go-gost/x/metrics"
 )
 
 type listener struct {
@@ -12,7 +12,7 @@ type listener struct {
 }
 
 func WrapListener(service string, ln net.Listener) net.Listener {
-	if !metrics.IsEnabled() {
+	if !xmetrics.IsEnabled() {
 		return ln
 	}
 

selector/strategy.go

@@ -2,11 +2,13 @@ package selector
 
 import (
 	"context"
+	"hash/crc32"
 	"math/rand"
 	"sync"
 	"sync/atomic"
 	"time"
 
+	"github.com/go-gost/core/logger"
 	"github.com/go-gost/core/metadata"
 	mdutil "github.com/go-gost/core/metadata/util"
 	"github.com/go-gost/core/selector"
@@ -101,7 +103,9 @@ func (s *hashStrategy[T]) Apply(ctx context.Context, vs ...T) (v T) {
 		return
 	}
 	if h := sx.HashFromContext(ctx); h != nil {
-		return vs[h.Value%len(vs)]
+		value := uint64(crc32.ChecksumIEEE([]byte(h.Source)))
+		logger.Default().Tracef("hash %s %d", h.Source, value)
+		return vs[value%uint64(len(vs))]
 	}
 
 	s.mu.Lock()

service/service.go

@@ -0,0 +1,169 @@
+package service
+
+import (
+	"context"
+	"hash/crc32"
+	"net"
+	"time"
+
+	"github.com/go-gost/core/admission"
+	"github.com/go-gost/core/handler"
+	"github.com/go-gost/core/listener"
+	"github.com/go-gost/core/logger"
+	"github.com/go-gost/core/metrics"
+	"github.com/go-gost/core/recorder"
+	"github.com/go-gost/core/service"
+	sx "github.com/go-gost/x/internal/util/selector"
+	xmetrics "github.com/go-gost/x/metrics"
+)
+
+type options struct {
+	admission admission.Admission
+	recorders []recorder.RecorderObject
+	logger    logger.Logger
+}
+
+type Option func(opts *options)
+
+func AdmissionOption(admission admission.Admission) Option {
+	return func(opts *options) {
+		opts.admission = admission
+	}
+}
+
+func RecordersOption(recorders ...recorder.RecorderObject) Option {
+	return func(opts *options) {
+		opts.recorders = recorders
+	}
+}
+
+func LoggerOption(logger logger.Logger) Option {
+	return func(opts *options) {
+		opts.logger = logger
+	}
+}
+
+type defaultService struct {
+	name     string
+	listener listener.Listener
+	handler  handler.Handler
+	options  options
+}
+
+func NewService(name string, ln listener.Listener, h handler.Handler, opts ...Option) service.Service {
+	var options options
+	for _, opt := range opts {
+		opt(&options)
+	}
+	return &defaultService{
+		name:     name,
+		listener: ln,
+		handler:  h,
+		options:  options,
+	}
+}
+
+func (s *defaultService) Addr() net.Addr {
+	return s.listener.Addr()
+}
+
+func (s *defaultService) Close() error {
+	return s.listener.Close()
+}
+
+func (s *defaultService) Serve() error {
+	if v := xmetrics.GetGauge(
+		xmetrics.MetricServicesGauge,
+		metrics.Labels{}); v != nil {
+		v.Inc()
+		defer v.Dec()
+	}
+
+	var tempDelay time.Duration
+	for {
+		conn, e := s.listener.Accept()
+		if e != nil {
+			// TODO: remove Temporary checking
+			if ne, ok := e.(net.Error); ok && ne.Temporary() {
+				if tempDelay == 0 {
+					tempDelay = 1 * time.Second
+				} else {
+					tempDelay *= 2
+				}
+				if max := 5 * time.Second; tempDelay > max {
+					tempDelay = max
+				}
+				s.options.logger.Warnf("accept: %v, retrying in %v", e, tempDelay)
+				time.Sleep(tempDelay)
+				continue
+			}
+			s.options.logger.Errorf("accept: %v", e)
+			return e
+		}
+		tempDelay = 0
+
+		for _, rec := range s.options.recorders {
+			host := conn.RemoteAddr().String()
+			if h, _, _ := net.SplitHostPort(host); h != "" {
+				host = h
+			}
+			if rec.Record == recorder.RecorderServiceClientAddress {
+				if err := rec.Recorder.Record(context.Background(), []byte(host)); err != nil {
+					s.options.logger.Errorf("record %s: %v", rec.Record, err)
+				}
+			}
+		}
+		if s.options.admission != nil &&
+			!s.options.admission.Admit(conn.RemoteAddr().String()) {
+			conn.Close()
+			s.options.logger.Debugf("admission: %s is denied", conn.RemoteAddr())
+			continue
+		}
+
+		go func() {
+			if v := xmetrics.GetCounter(xmetrics.MetricServiceRequestsCounter,
+				metrics.Labels{"service": s.name}); v != nil {
+				v.Inc()
+			}
+
+			if v := xmetrics.GetGauge(xmetrics.MetricServiceRequestsInFlightGauge,
+				metrics.Labels{"service": s.name}); v != nil {
+				v.Inc()
+				defer v.Dec()
+			}
+
+			start := time.Now()
+			if v := xmetrics.GetObserver(xmetrics.MetricServiceRequestsDurationObserver,
+				metrics.Labels{"service": s.name}); v != nil {
+				defer func() {
+					v.Observe(float64(time.Since(start).Seconds()))
+				}()
+			}
+
+			ctx := sx.ContextWithHash(context.Background(), &sx.Hash{
+				Source: conn.RemoteAddr().String(),
+				Value:  ipHash(conn.RemoteAddr()),
+			})
+
+			if err := s.handler.Handle(ctx, conn); err != nil {
+				s.options.logger.Error(err)
+				if v := xmetrics.GetCounter(xmetrics.MetricServiceHandlerErrorsCounter,
+					metrics.Labels{"service": s.name}); v != nil {
+					v.Inc()
+				}
+			}
+		}()
+	}
+}
+
+func ipHash(addr net.Addr) uint64 {
+	if addr == nil {
+		return 0
+	}
+
+	host, _, _ := net.SplitHostPort(addr.String())
+	if ip := net.ParseIP(host); ip != nil {
+		return uint64(crc32.ChecksumIEEE(ip.To16()))
+	}
+	return 0
+}