add metrics

go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/docker/libcontainer v2.2.1+incompatible
 	github.com/gin-contrib/cors v1.3.1
 	github.com/gin-gonic/gin v1.7.7
-	github.com/go-gost/core v0.0.0-20220404033031-04f6ed470873
+	github.com/go-gost/core v0.0.0-20220405095520-c2f49e94443c
 	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
@@ -18,6 +18,7 @@ require (
 	github.com/lucas-clemente/quic-go v0.25.0
 	github.com/miekg/dns v1.1.47
 	github.com/milosgajdos/tenus v0.0.3
+	github.com/prometheus/client_golang v1.12.1
 	github.com/rs/xid v1.3.0
 	github.com/shadowsocks/go-shadowsocks2 v0.1.5
 	github.com/shadowsocks/shadowsocks-go v0.0.0-20200409064450-3e585ff90601
@@ -69,7 +70,6 @@ require (
 	github.com/onsi/ginkgo v1.16.5 // indirect
 	github.com/pelletier/go-toml v1.9.4 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
-	github.com/prometheus/client_golang v1.12.1 // indirect
 	github.com/prometheus/client_model v0.2.0 // indirect
 	github.com/prometheus/common v0.32.1 // indirect
 	github.com/prometheus/procfs v0.7.3 // indirect

go.sum

@@ -119,8 +119,8 @@ github.com/go-errors/errors v1.0.1/go.mod h1:f4zRHt4oKfwPJE5k8C9vpYG+aDHdBFUsgrm
 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 v0.0.0-20220404033031-04f6ed470873 h1:u+g28xvN00bW5ivbhb2GGo0R+JIBy5arxy5R+rKesqk=
+github.com/go-gost/core v0.0.0-20220405095520-c2f49e94443c h1:TzDyqefjnUVgdT6piHZgeXrVKXevawsMs0kmSZZhDR4=
-github.com/go-gost/core v0.0.0-20220404033031-04f6ed470873/go.mod h1:/LzdiQ+0+3FMhyqw0phjFjXFdOa1fcQR5/bL/7ripCs=
+github.com/go-gost/core v0.0.0-20220405095520-c2f49e94443c/go.mod h1:/LzdiQ+0+3FMhyqw0phjFjXFdOa1fcQR5/bL/7ripCs=
 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/auto/handler.go

@@ -6,11 +6,11 @@ import (
 	"net"
 	"time"
 
-	netpkg "github.com/go-gost/core/common/net"
 	"github.com/go-gost/core/handler"
 	md "github.com/go-gost/core/metadata"
 	"github.com/go-gost/gosocks4"
 	"github.com/go-gost/gosocks5"
+	netpkg "github.com/go-gost/x/internal/net"
 	"github.com/go-gost/x/registry"
 )
 

handler/forward/local/handler.go

@@ -8,9 +8,9 @@ import (
 	"time"
 
 	"github.com/go-gost/core/chain"
-	netpkg "github.com/go-gost/core/common/net"
 	"github.com/go-gost/core/handler"
 	md "github.com/go-gost/core/metadata"
+	netpkg "github.com/go-gost/x/internal/net"
 	"github.com/go-gost/x/registry"
 )
 

handler/forward/remote/handler.go

@@ -8,9 +8,9 @@ import (
 	"time"
 
 	"github.com/go-gost/core/chain"
-	netpkg "github.com/go-gost/core/common/net"
 	"github.com/go-gost/core/handler"
 	md "github.com/go-gost/core/metadata"
+	netpkg "github.com/go-gost/x/internal/net"
 	"github.com/go-gost/x/registry"
 )
 

handler/http/handler.go

@@ -17,10 +17,10 @@ import (
 
 	"github.com/asaskevich/govalidator"
 	"github.com/go-gost/core/chain"
-	netpkg "github.com/go-gost/core/common/net"
 	"github.com/go-gost/core/handler"
 	"github.com/go-gost/core/logger"
 	md "github.com/go-gost/core/metadata"
+	netpkg "github.com/go-gost/x/internal/net"
 	"github.com/go-gost/x/registry"
 )
 

handler/http/udp.go

@@ -8,8 +8,8 @@ import (
 	"net/http/httputil"
 	"time"
 
-	"github.com/go-gost/core/common/net/relay"
 	"github.com/go-gost/core/logger"
+	"github.com/go-gost/x/internal/net/udp"
 	"github.com/go-gost/x/internal/util/socks"
 )
 
@@ -65,7 +65,7 @@ func (h *httpHandler) handleUDP(ctx context.Context, conn net.Conn, log logger.L
 		return err
 	}
 
-	relay := relay.NewUDPRelay(socks.UDPTunServerConn(conn), pc).
+	relay := udp.NewRelay(socks.UDPTunServerConn(conn), pc).
 		WithBypass(h.options.Bypass).
 		WithLogger(log)
 

handler/http2/handler.go

@@ -19,10 +19,10 @@ import (
 	"time"
 
 	"github.com/go-gost/core/chain"
-	netpkg "github.com/go-gost/core/common/net"
 	"github.com/go-gost/core/handler"
 	"github.com/go-gost/core/logger"
 	md "github.com/go-gost/core/metadata"
+	netpkg "github.com/go-gost/x/internal/net"
 	"github.com/go-gost/x/registry"
 )
 

handler/redirect/tcp/handler.go

@@ -14,11 +14,11 @@ import (
 	"time"
 
 	"github.com/go-gost/core/chain"
-	netpkg "github.com/go-gost/core/common/net"
 	"github.com/go-gost/core/handler"
 	"github.com/go-gost/core/logger"
 	md "github.com/go-gost/core/metadata"
 	dissector "github.com/go-gost/tls-dissector"
+	netpkg "github.com/go-gost/x/internal/net"
 	"github.com/go-gost/x/registry"
 )
 

handler/redirect/udp/handler.go

@@ -7,9 +7,9 @@ import (
 	"time"
 
 	"github.com/go-gost/core/chain"
-	netpkg "github.com/go-gost/core/common/net"
 	"github.com/go-gost/core/handler"
 	md "github.com/go-gost/core/metadata"
+	netpkg "github.com/go-gost/x/internal/net"
 	"github.com/go-gost/x/registry"
 )
 

handler/relay/bind.go

@@ -6,10 +6,10 @@ import (
 	"net"
 	"time"
 
-	netpkg "github.com/go-gost/core/common/net"
-	net_relay "github.com/go-gost/core/common/net/relay"
 	"github.com/go-gost/core/logger"
 	"github.com/go-gost/relay"
+	netpkg "github.com/go-gost/x/internal/net"
+	"github.com/go-gost/x/internal/net/udp"
 	"github.com/go-gost/x/internal/util/mux"
 	relay_util "github.com/go-gost/x/internal/util/relay"
 )
@@ -113,7 +113,7 @@ func (h *relayHandler) bindUDP(ctx context.Context, conn net.Conn, network, addr
 	})
 	log.Debugf("bind on %s OK", pc.LocalAddr())
 
-	r := net_relay.NewUDPRelay(relay_util.UDPTunServerConn(conn), pc).
+	r := udp.NewRelay(relay_util.UDPTunServerConn(conn), pc).
 		WithBypass(h.options.Bypass).
 		WithLogger(log)
 	r.SetBufferSize(h.md.udpBufferSize)

handler/relay/connect.go

@@ -7,9 +7,9 @@ import (
 	"net"
 	"time"
 
-	netpkg "github.com/go-gost/core/common/net"
 	"github.com/go-gost/core/logger"
 	"github.com/go-gost/relay"
+	netpkg "github.com/go-gost/x/internal/net"
 )
 
 func (h *relayHandler) handleConnect(ctx context.Context, conn net.Conn, network, address string, log logger.Logger) error {

handler/relay/forward.go

@@ -7,9 +7,9 @@ import (
 	"net"
 	"time"
 
-	netpkg "github.com/go-gost/core/common/net"
 	"github.com/go-gost/core/logger"
 	"github.com/go-gost/relay"
+	netpkg "github.com/go-gost/x/internal/net"
 )
 
 func (h *relayHandler) handleForward(ctx context.Context, conn net.Conn, network string, log logger.Logger) error {

handler/sni/handler.go

@@ -13,10 +13,10 @@ import (
 
 	"github.com/go-gost/core/chain"
 	"github.com/go-gost/core/common/bufpool"
-	netpkg "github.com/go-gost/core/common/net"
 	"github.com/go-gost/core/handler"
 	md "github.com/go-gost/core/metadata"
 	dissector "github.com/go-gost/tls-dissector"
+	netpkg "github.com/go-gost/x/internal/net"
 	"github.com/go-gost/x/registry"
 )
 

handler/socks/v4/handler.go

@@ -7,11 +7,11 @@ import (
 	"time"
 
 	"github.com/go-gost/core/chain"
-	netpkg "github.com/go-gost/core/common/net"
 	"github.com/go-gost/core/handler"
 	"github.com/go-gost/core/logger"
 	md "github.com/go-gost/core/metadata"
 	"github.com/go-gost/gosocks4"
+	netpkg "github.com/go-gost/x/internal/net"
 	"github.com/go-gost/x/registry"
 )
 

handler/socks/v5/bind.go

@@ -6,9 +6,9 @@ import (
 	"net"
 	"time"
 
-	netpkg "github.com/go-gost/core/common/net"
 	"github.com/go-gost/core/logger"
 	"github.com/go-gost/gosocks5"
+	netpkg "github.com/go-gost/x/internal/net"
 )
 
 func (h *socks5Handler) handleBind(ctx context.Context, conn net.Conn, network, address string, log logger.Logger) error {

handler/socks/v5/connect.go

@@ -6,9 +6,9 @@ import (
 	"net"
 	"time"
 
-	netpkg "github.com/go-gost/core/common/net"
 	"github.com/go-gost/core/logger"
 	"github.com/go-gost/gosocks5"
+	netpkg "github.com/go-gost/x/internal/net"
 )
 
 func (h *socks5Handler) handleConnect(ctx context.Context, conn net.Conn, network, address string, log logger.Logger) error {

handler/socks/v5/mbind.go

@@ -6,9 +6,9 @@ import (
 	"net"
 	"time"
 
-	netpkg "github.com/go-gost/core/common/net"
 	"github.com/go-gost/core/logger"
 	"github.com/go-gost/gosocks5"
+	netpkg "github.com/go-gost/x/internal/net"
 	"github.com/go-gost/x/internal/util/mux"
 )
 

handler/socks/v5/udp.go

@@ -9,9 +9,9 @@ import (
 	"net"
 	"time"
 
-	"github.com/go-gost/core/common/net/relay"
 	"github.com/go-gost/core/logger"
 	"github.com/go-gost/gosocks5"
+	"github.com/go-gost/x/internal/net/udp"
 	"github.com/go-gost/x/internal/util/socks"
 )
 
@@ -68,7 +68,7 @@ func (h *socks5Handler) handleUDP(ctx context.Context, conn net.Conn, log logger
 		return err
 	}
 
-	r := relay.NewUDPRelay(socks.UDPConn(cc, h.md.udpBufferSize), pc).
+	r := udp.NewRelay(socks.UDPConn(cc, h.md.udpBufferSize), pc).
 		WithBypass(h.options.Bypass).
 		WithLogger(log)
 	r.SetBufferSize(h.md.udpBufferSize)

handler/socks/v5/udp_tun.go

@@ -5,9 +5,9 @@ import (
 	"net"
 	"time"
 
-	"github.com/go-gost/core/common/net/relay"
 	"github.com/go-gost/core/logger"
 	"github.com/go-gost/gosocks5"
+	"github.com/go-gost/x/internal/net/udp"
 	"github.com/go-gost/x/internal/util/socks"
 )
 
@@ -56,7 +56,7 @@ func (h *socks5Handler) handleUDPTun(ctx context.Context, conn net.Conn, network
 	log.Debug(reply)
 	log.Debugf("bind on %s OK", pc.LocalAddr())
 
-	r := relay.NewUDPRelay(socks.UDPTunServerConn(conn), pc).
+	r := udp.NewRelay(socks.UDPTunServerConn(conn), pc).
 		WithBypass(h.options.Bypass).
 		WithLogger(log)
 	r.SetBufferSize(h.md.udpBufferSize)

handler/ss/handler.go

@@ -8,10 +8,10 @@ import (
 	"time"
 
 	"github.com/go-gost/core/chain"
-	netpkg "github.com/go-gost/core/common/net"
 	"github.com/go-gost/core/handler"
 	md "github.com/go-gost/core/metadata"
 	"github.com/go-gost/gosocks5"
+	netpkg "github.com/go-gost/x/internal/net"
 	"github.com/go-gost/x/internal/util/ss"
 	"github.com/go-gost/x/registry"
 	"github.com/shadowsocks/go-shadowsocks2/core"

handler/sshd/handler.go

@@ -10,10 +10,10 @@ import (
 	"time"
 
 	"github.com/go-gost/core/chain"
-	netpkg "github.com/go-gost/core/common/net"
 	"github.com/go-gost/core/handler"
 	"github.com/go-gost/core/logger"
 	md "github.com/go-gost/core/metadata"
+	netpkg "github.com/go-gost/x/internal/net"
 	sshd_util "github.com/go-gost/x/internal/util/sshd"
 	"github.com/go-gost/x/registry"
 	"golang.org/x/crypto/ssh"

internal/net/transport.go

@@ -0,0 +1,50 @@
+package net
+
+import (
+	"bufio"
+	"io"
+	"net"
+
+	"github.com/go-gost/core/common/bufpool"
+)
+
+func Transport(rw1, rw2 io.ReadWriter) error {
+	errc := make(chan error, 1)
+	go func() {
+		errc <- copyBuffer(rw1, rw2)
+	}()
+
+	go func() {
+		errc <- copyBuffer(rw2, rw1)
+	}()
+
+	err := <-errc
+	if err != nil && err == io.EOF {
+		err = nil
+	}
+	return err
+}
+
+func copyBuffer(dst io.Writer, src io.Reader) error {
+	buf := bufpool.Get(32 * 1024)
+	defer bufpool.Put(buf)
+
+	_, err := io.CopyBuffer(dst, src, *buf)
+	return err
+}
+
+type bufferReaderConn struct {
+	net.Conn
+	br *bufio.Reader
+}
+
+func NewBufferReaderConn(conn net.Conn, br *bufio.Reader) net.Conn {
+	return &bufferReaderConn{
+		Conn: conn,
+		br:   br,
+	}
+}
+
+func (c *bufferReaderConn) Read(b []byte) (int, error) {
+	return c.br.Read(b)
+}

internal/net/udp/relay.go

@@ -0,0 +1,126 @@
+package udp
+
+import (
+	"net"
+
+	"github.com/go-gost/core/bypass"
+	"github.com/go-gost/core/common/bufpool"
+	"github.com/go-gost/core/logger"
+)
+
+type Relay struct {
+	pc1 net.PacketConn
+	pc2 net.PacketConn
+
+	bypass     bypass.Bypass
+	bufferSize int
+	logger     logger.Logger
+}
+
+func NewRelay(pc1, pc2 net.PacketConn) *Relay {
+	return &Relay{
+		pc1: pc1,
+		pc2: pc2,
+	}
+}
+
+func (r *Relay) WithBypass(bp bypass.Bypass) *Relay {
+	r.bypass = bp
+	return r
+}
+
+func (r *Relay) WithLogger(logger logger.Logger) *Relay {
+	r.logger = logger
+	return r
+}
+
+func (r *Relay) SetBufferSize(n int) {
+	r.bufferSize = n
+}
+
+func (r *Relay) Run() (err error) {
+	bufSize := r.bufferSize
+	if bufSize <= 0 {
+		bufSize = 1500
+	}
+
+	errc := make(chan error, 2)
+
+	go func() {
+		for {
+			err := func() error {
+				b := bufpool.Get(bufSize)
+				defer bufpool.Put(b)
+
+				n, raddr, err := r.pc1.ReadFrom(*b)
+				if err != nil {
+					return err
+				}
+
+				if r.bypass != nil && r.bypass.Contains(raddr.String()) {
+					if r.logger != nil {
+						r.logger.Warn("bypass: ", raddr)
+					}
+					return nil
+				}
+
+				if _, err := r.pc2.WriteTo((*b)[:n], raddr); err != nil {
+					return err
+				}
+
+				if r.logger != nil {
+					r.logger.Debugf("%s >>> %s data: %d",
+						r.pc2.LocalAddr(), raddr, n)
+
+				}
+
+				return nil
+			}()
+
+			if err != nil {
+				errc <- err
+				return
+			}
+		}
+	}()
+
+	go func() {
+		for {
+			err := func() error {
+				b := bufpool.Get(bufSize)
+				defer bufpool.Put(b)
+
+				n, raddr, err := r.pc2.ReadFrom(*b)
+				if err != nil {
+					return err
+				}
+
+				if r.bypass != nil && r.bypass.Contains(raddr.String()) {
+					if r.logger != nil {
+						r.logger.Warn("bypass: ", raddr)
+					}
+					return nil
+				}
+
+				if _, err := r.pc1.WriteTo((*b)[:n], raddr); err != nil {
+					return err
+				}
+
+				if r.logger != nil {
+					r.logger.Debugf("%s <<< %s data: %d",
+						r.pc2.LocalAddr(), raddr, n)
+
+				}
+
+				return nil
+			}()
+
+			if err != nil {
+				errc <- err
+				return
+			}
+		}
+	}()
+
+	return <-errc
+}

metrics/metrics.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{
+			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"}),
+		},
+		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 (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

@@ -0,0 +1,65 @@
+package service
+
+import (
+	"net"
+	"net/http"
+
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+const (
+	DefaultPath = "/metrics"
+)
+
+type options struct {
+	path string
+}
+
+type Option func(*options)
+
+func PathOption(path string) Option {
+	return func(o *options) {
+		o.path = path
+	}
+}
+
+type Service struct {
+	s  *http.Server
+	ln net.Listener
+}
+
+func NewService(addr string, opts ...Option) (*Service, error) {
+	ln, err := net.Listen("tcp", addr)
+	if err != nil {
+		return nil, err
+	}
+
+	var options options
+	for _, opt := range opts {
+		opt(&options)
+	}
+	if options.path == "" {
+		options.path = DefaultPath
+	}
+
+	mux := http.NewServeMux()
+	mux.Handle(options.path, promhttp.Handler())
+	return &Service{
+		s: &http.Server{
+			Handler: mux,
+		},
+		ln: ln,
+	}, nil
+}
+
+func (s *Service) Serve() error {
+	return s.s.Serve(s.ln)
+}
+
+func (s *Service) Addr() net.Addr {
+	return s.ln.Addr()
+}
+
+func (s *Service) Close() error {
+	return s.s.Close()
+}