improve http handler

cmd/gost/config.go

@@ -16,6 +16,121 @@ import (
 	"github.com/go-gost/gost/pkg/service"
 )
 
+func buildService(cfg *config.Config) (services []*service.Service) {
+	if cfg == nil || len(cfg.Services) == 0 {
+		return
+	}
+
+	chains := buildChain(cfg)
+
+	for _, svc := range cfg.Services {
+		listenerLogger := log.WithFields(map[string]interface{}{
+			"kind":    "listener",
+			"type":    svc.Listener.Type,
+			"service": svc.Name,
+		})
+		ln := registry.GetListener(svc.Listener.Type)(
+			listener.AddrOption(svc.Addr),
+			listener.LoggerOption(listenerLogger),
+		)
+		if err := ln.Init(metadata.MapMetadata(svc.Listener.Metadata)); err != nil {
+			listenerLogger.Fatal("init:", err)
+		}
+
+		var chain *chain.Chain
+		for _, ch := range chains {
+			if svc.Chain == ch.Name {
+				chain = ch
+				break
+			}
+		}
+
+		handlerLogger := log.WithFields(map[string]interface{}{
+			"kind":    "handler",
+			"type":    svc.Handler.Type,
+			"service": svc.Name,
+		})
+		h := registry.GetHandler(svc.Handler.Type)(
+			handler.ChainOption(chain),
+			handler.LoggerOption(handlerLogger),
+		)
+		if err := h.Init(metadata.MapMetadata(svc.Handler.Metadata)); err != nil {
+			handlerLogger.Fatal("init:", err)
+		}
+
+		s := (&service.Service{}).
+			WithListener(ln).
+			WithHandler(h)
+		services = append(services, s)
+	}
+
+	return
+}
+
+func buildChain(cfg *config.Config) (chains []*chain.Chain) {
+	if cfg == nil || len(cfg.Chains) == 0 {
+		return nil
+	}
+
+	for _, ch := range cfg.Chains {
+		c := &chain.Chain{
+			Name: ch.Name,
+		}
+
+		selector := selectorFromConfig(ch.LB)
+		for _, hop := range ch.Hops {
+			group := &chain.NodeGroup{}
+			for _, v := range hop.Nodes {
+				node := chain.NewNode(v.Name, v.Addr)
+
+				connectorLogger := log.WithFields(map[string]interface{}{
+					"kind": "connector",
+					"type": v.Connector.Type,
+					"hop":  hop.Name,
+					"node": node.Name(),
+				})
+				cr := registry.GetConnector(v.Connector.Type)(
+					connector.LoggerOption(connectorLogger),
+				)
+				if err := cr.Init(metadata.MapMetadata(v.Connector.Metadata)); err != nil {
+					connectorLogger.Fatal("init:", err)
+				}
+
+				dialerLogger := log.WithFields(map[string]interface{}{
+					"kind": "dialer",
+					"type": v.Dialer.Type,
+					"hop":  hop.Name,
+					"node": node.Name(),
+				})
+				d := registry.GetDialer(v.Dialer.Type)(
+					dialer.LoggerOption(dialerLogger),
+				)
+				if err := d.Init(metadata.MapMetadata(v.Dialer.Metadata)); err != nil {
+					dialerLogger.Fatal("init:", err)
+				}
+
+				tr := (&chain.Transport{}).
+					WithConnector(cr).
+					WithDialer(d)
+
+				node.WithTransport(tr)
+				group.AddNode(node)
+			}
+
+			sel := selector
+			if s := selectorFromConfig(hop.LB); s != nil {
+				sel = s
+			}
+			group.WithSelector(sel)
+			c.AddNodeGroup(group)
+		}
+
+		chains = append(chains, c)
+	}
+
+	return
+}
+
 func logFromConfig(cfg *config.LogConfig) logger.Logger {
 	opts := []logger.LoggerOption{
 		logger.FormatLoggerOption(logger.LogFormat(cfg.Format)),
@@ -41,100 +156,29 @@ func logFromConfig(cfg *config.LogConfig) logger.Logger {
 	return logger.NewLogger(opts...)
 }
 
-func buildService(cfg *config.Config) (services []*service.Service) {
+func selectorFromConfig(cfg *config.LoadbalancingConfig) chain.Selector {
-	if cfg == nil || len(cfg.Services) == 0 {
+	if cfg == nil {
-		return
-	}
-
-	chains := buildChain(cfg)
-
-	for _, svc := range cfg.Services {
-		s := &service.Service{}
-
-		ln := registry.GetListener(svc.Listener.Type)(
-			listener.AddrOption(svc.Addr),
-			listener.LoggerOption(
-				log.WithFields(map[string]interface{}{
-					"kind": "listener",
-					"type": svc.Listener.Type,
-				}),
-			),
-		)
-		ln.Init(metadata.MapMetadata(svc.Listener.Metadata))
-		s.WithListener(ln)
-
-		var chain *chain.Chain
-		for _, ch := range chains {
-			if svc.Chain == ch.Name {
-				chain = ch
-				break
-			}
-		}
-		h := registry.GetHandler(svc.Handler.Type)(
-			handler.ChainOption(chain),
-			handler.LoggerOption(
-				log.WithFields(map[string]interface{}{
-					"kind": "handler",
-					"type": svc.Handler.Type,
-				}),
-			),
-		)
-		h.Init(metadata.MapMetadata(svc.Handler.Metadata))
-		s.WithHandler(h)
-
-		services = append(services, s)
-	}
-
-	return
-}
-
-func buildChain(cfg *config.Config) (chains []*chain.Chain) {
-	if cfg == nil || len(cfg.Chains) == 0 {
 		return nil
 	}
 
-	for _, ch := range cfg.Chains {
+	var strategy chain.Strategy
-		c := &chain.Chain{
+	switch cfg.Strategy {
-			Name: ch.Name,
+	case "round":
-		}
+		strategy = &chain.RoundRobinStrategy{}
-		for _, hop := range ch.Hops {
+	case "random":
-			group := &chain.NodeGroup{}
+		strategy = &chain.RandomStrategy{}
-			for _, v := range hop.Nodes {
+	case "fifio":
-				node := chain.NewNode(v.Name, v.Addr)
+		strategy = &chain.FIFOStrategy{}
-
+	default:
-				tr := &chain.Transport{}
+		strategy = &chain.RoundRobinStrategy{}
-
-				cr := registry.GetConnector(v.Connector.Type)(
-					connector.LoggerOption(
-						log.WithFields(map[string]interface{}{
-							"kind": "connector",
-							"type": v.Connector.Type,
-						}),
-					),
-				)
-				cr.Init(metadata.MapMetadata(v.Connector.Metadata))
-				tr.WithConnector(cr)
-
-				d := registry.GetDialer(v.Dialer.Type)(
-					dialer.LoggerOption(
-						log.WithFields(map[string]interface{}{
-							"kind": "dialer",
-							"type": v.Dialer.Type,
-						}),
-					),
-				)
-				d.Init(metadata.MapMetadata(v.Dialer.Metadata))
-				tr.WithDialer(d)
-
-				node.WithTransport(tr)
-
-				group.AddNode(node)
-			}
-			c.AddNodeGroup(group)
-		}
-
-		chains = append(chains, c)
 	}
 
-	return
+	return chain.NewSelector(
+		strategy,
+		&chain.InvalidFilter{},
+		&chain.FailFilter{
+			MaxFails:    cfg.MaxFails,
+			FailTimeout: cfg.FailTimeout,
+		},
+	)
 }

cmd/gost/gost.yml

@@ -4,46 +4,77 @@ log:
   format: json # text, json
 
 services:
-- url: "http://gost:gost@:8000"
+- name: http+tcp
+  url: "http://gost:gost@:8000"
   addr: ":8000"
   handler:
     type: http
     metadata:
       proxyAgent: "gost/3.0"
+      retry: 3
       auths:
       - user1:pass1
       - user2:pass2
+      # probeResist: code:404 # code, web, host, file
+      # knock: example.com
   listener:
     type: tcp
     metadata:
       keepAlive: 15s
-  # chain: chain01
+  chain: chain01
 
 chains:
 - name: chain01
   # chain level load balancing
   lb:
     strategy: round
-    filters:
+    maxFails: 1
-    - filter1   
+    failTimeout: 30s
   hops:
-  - name: level01
+  - name: hop01
     # hop level load balancing
     lb:
-      strategy: rand
+      strategy: round
-      filters:
+      maxFails: 1
-      - filter1   
+      failTimeout: 30s
     nodes:
     - name: node01
-      addr: ":8080"
+      addr: ":8081"
-      url: "http://gost:gost@:8080"
+      url: "http://gost:gost@:8081"
       connector:
         type: http
         metadata:
           userAgent: "gost/3.0"
-          auth: username:password
+          auth: user1:pass1
+      dialer:
+        type: tcp
+        metadata: {}
+    - name: node02
+      addr: ":8082"
+      url: "http://gost:gost@:8082"
+      connector:
+        type: http
+        metadata:
+          userAgent: "gost/3.0"
+          auth: user1:pass1
+      dialer:
+        type: tcp
+        metadata: {}
+  - name: hop02
+    # hop level load balancing
+    lb:
+      strategy: round
+      maxFails: 1
+      failTimeout: 30s
+    nodes:
+    - name: node03
+      addr: ":8083"
+      url: "http://gost:gost@:8083"
+      connector:
+        type: http
+        metadata:
+          userAgent: "gost/3.0"
+          auth: user1:pass1
       dialer:
         type: tcp
         metadata: {}
-
-

cmd/gost/main.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	stdlog "log"
+
 	"github.com/go-gost/gost/pkg/config"
 	"github.com/go-gost/gost/pkg/logger"
 )
@@ -10,6 +12,7 @@ var (
 )
 
 func main() {
+	stdlog.SetFlags(stdlog.LstdFlags | stdlog.Lshortfile)
 	cfg := &config.Config{}
 	if err := cfg.Load(); err != nil {
 		log.Fatal(err)

pkg/chain/node.go

@@ -1,15 +1,22 @@
 package chain
 
+import (
+	"sync"
+	"time"
+)
+
 type Node struct {
 	name      string
 	addr      string
 	transport *Transport
+	marker    *failMarker
 }
 
 func NewNode(name, addr string) *Node {
 	return &Node{
-		name: name,
+		name:   name,
-		addr: addr,
+		addr:   addr,
+		marker: &failMarker{},
 	}
 }
 
@@ -45,15 +52,72 @@ func (g *NodeGroup) AddNode(node *Node) {
 	g.nodes = append(g.nodes, node)
 }
 
-func (g *NodeGroup) WithSelector(selector Selector) {
+func (g *NodeGroup) WithSelector(selector Selector) *NodeGroup {
 	g.selector = selector
+	return g
 }
 
 func (g *NodeGroup) Next() *Node {
+	if g == nil || len(g.nodes) == 0 {
+		return nil
+	}
+
 	selector := g.selector
 	if selector == nil {
-		// selector = defaultSelector
 		return g.nodes[0]
 	}
+
 	return selector.Select(g.nodes...)
 }
+
+type failMarker struct {
+	failTime  int64
+	failCount uint32
+	mux       sync.RWMutex
+}
+
+func (m *failMarker) FailTime() int64 {
+	if m == nil {
+		return 0
+	}
+
+	m.mux.RLock()
+	defer m.mux.RUnlock()
+
+	return m.failTime
+}
+
+func (m *failMarker) FailCount() uint32 {
+	if m == nil {
+		return 0
+	}
+
+	m.mux.RLock()
+	defer m.mux.RUnlock()
+
+	return m.failCount
+}
+
+func (m *failMarker) Mark() {
+	if m == nil {
+		return
+	}
+
+	m.mux.Lock()
+	defer m.mux.Unlock()
+
+	m.failTime = time.Now().Unix()
+	m.failCount++
+}
+
+func (m *failMarker) Reset() {
+	if m == nil {
+		return
+	}
+
+	m.mux.Lock()
+	defer m.mux.Unlock()
+
+	m.failTime = 0
+	m.failCount = 0
+}

pkg/chain/route.go

@@ -22,26 +22,34 @@ func (r *Route) Connect(ctx context.Context) (conn net.Conn, err error) {
 	node := r.nodes[0]
 	cc, err := node.Transport().Dial(ctx, r.nodes[0].Addr())
 	if err != nil {
+		node.marker.Mark()
 		return
 	}
 
 	cn, err := node.Transport().Handshake(ctx, cc)
 	if err != nil {
 		cc.Close()
+		node.marker.Mark()
 		return
 	}
+	node.marker.Reset()
 
 	preNode := node
 	for _, node := range r.nodes[1:] {
 		cc, err = preNode.Transport().Connect(ctx, cn, "tcp", node.Addr())
 		if err != nil {
 			cn.Close()
+			node.marker.Mark()
 			return
 		}
 		cc, err = node.transport.Handshake(ctx, cc)
 		if err != nil {
 			cn.Close()
+			node.marker.Mark()
+			return
 		}
+		node.marker.Reset()
+
 		cn = cc
 		preNode = node
 	}

pkg/chain/selector.go

@@ -1,19 +1,24 @@
 package chain
 
+import (
+	"math/rand"
+	"net"
+	"strconv"
+	"sync"
+	"sync/atomic"
+	"time"
+)
+
+// default options for FailFilter
+const (
+	DefaultMaxFails    = 1
+	DefaultFailTimeout = 30 * time.Second
+)
+
 var (
 	defaultSelector Selector = NewSelector(nil)
 )
 
-type Filter interface {
-	Filter(nodes ...*Node) []*Node
-	String() string
-}
-
-type Strategy interface {
-	Apply(nodes ...*Node) *Node
-	String() string
-}
-
 type Selector interface {
 	Select(nodes ...*Node) *Node
 }
@@ -39,3 +44,115 @@ func (s *selector) Select(nodes ...*Node) *Node {
 	}
 	return s.strategy.Apply(nodes...)
 }
+
+type Strategy interface {
+	Apply(nodes ...*Node) *Node
+}
+
+// RoundStrategy is a strategy for node selector.
+// The node will be selected by round-robin algorithm.
+type RoundRobinStrategy struct {
+	counter uint64
+}
+
+func (s *RoundRobinStrategy) Apply(nodes ...*Node) *Node {
+	if len(nodes) == 0 {
+		return nil
+	}
+
+	n := atomic.AddUint64(&s.counter, 1) - 1
+	return nodes[int(n%uint64(len(nodes)))]
+}
+
+// RandomStrategy is a strategy for node selector.
+// The node will be selected randomly.
+type RandomStrategy struct {
+	Seed int64
+	rand *rand.Rand
+	once sync.Once
+	mux  sync.Mutex
+}
+
+func (s *RandomStrategy) Apply(nodes ...*Node) *Node {
+	s.once.Do(func() {
+		seed := s.Seed
+		if seed == 0 {
+			seed = time.Now().UnixNano()
+		}
+		s.rand = rand.New(rand.NewSource(seed))
+	})
+	if len(nodes) == 0 {
+		return nil
+	}
+
+	s.mux.Lock()
+	defer s.mux.Unlock()
+
+	r := s.rand.Int()
+
+	return nodes[r%len(nodes)]
+}
+
+// FIFOStrategy is a strategy for node selector.
+// The node will be selected from first to last,
+// and will stick to the selected node until it is failed.
+type FIFOStrategy struct{}
+
+// Apply applies the fifo strategy for the nodes.
+func (s *FIFOStrategy) Apply(nodes ...*Node) *Node {
+	if len(nodes) == 0 {
+		return nil
+	}
+	return nodes[0]
+}
+
+type Filter interface {
+	Filter(nodes ...*Node) []*Node
+}
+
+// FailFilter filters the dead node.
+// A node is marked as dead if its failed count is greater than MaxFails.
+type FailFilter struct {
+	MaxFails    int
+	FailTimeout time.Duration
+}
+
+// Filter filters dead nodes.
+func (f *FailFilter) Filter(nodes ...*Node) []*Node {
+	maxFails := f.MaxFails
+	if maxFails == 0 {
+		maxFails = DefaultMaxFails
+	}
+	failTimeout := f.FailTimeout
+	if failTimeout == 0 {
+		failTimeout = DefaultFailTimeout
+	}
+
+	if len(nodes) <= 1 || maxFails < 0 {
+		return nodes
+	}
+	var nl []*Node
+	for _, node := range nodes {
+		if node.marker.FailCount() < uint32(maxFails) ||
+			time.Since(time.Unix(node.marker.FailTime(), 0)) >= failTimeout {
+			nl = append(nl, node)
+		}
+	}
+	return nl
+}
+
+// InvalidFilter filters the invalid node.
+// A node is invalid if its port is invalid (negative or zero value).
+type InvalidFilter struct{}
+
+// Filter filters invalid nodes.
+func (f *InvalidFilter) Filter(nodes ...*Node) []*Node {
+	var nl []*Node
+	for _, node := range nodes {
+		_, sport, _ := net.SplitHostPort(node.Addr())
+		if port, _ := strconv.Atoi(sport); port > 0 {
+			nl = append(nl, node)
+		}
+	}
+	return nl
+}

pkg/components/connector/http/connector.go

@@ -5,9 +5,9 @@ import (
 	"context"
 	"encoding/base64"
 	"fmt"
-	"log"
 	"net"
 	"net/http"
+	"net/http/httputil"
 	"net/url"
 	"strings"
 
@@ -51,11 +51,15 @@ func (c *Connector) Connect(ctx context.Context, conn net.Conn, network, address
 		Header:     make(http.Header),
 	}
 	if c.md.UserAgent != "" {
-		log.Println(c.md.UserAgent)
 		req.Header.Set("User-Agent", c.md.UserAgent)
 	}
 	req.Header.Set("Proxy-Connection", "keep-alive")
 
+	c.logger = c.logger.WithFields(map[string]interface{}{
+		"src": conn.LocalAddr().String(),
+		"dst": conn.RemoteAddr().String(),
+	})
+
 	if user := c.md.User; user != nil {
 		u := user.Username()
 		p, _ := user.Password()
@@ -63,6 +67,11 @@ func (c *Connector) Connect(ctx context.Context, conn net.Conn, network, address
 			"Basic "+base64.StdEncoding.EncodeToString([]byte(u+":"+p)))
 	}
 
+	if c.logger.IsLevelEnabled(logger.DebugLevel) {
+		dump, _ := httputil.DumpRequest(req, false)
+		c.logger.Debug(string(dump))
+	}
+
 	req = req.WithContext(ctx)
 	if err := req.Write(conn); err != nil {
 		return nil, err
@@ -74,6 +83,11 @@ func (c *Connector) Connect(ctx context.Context, conn net.Conn, network, address
 	}
 	defer resp.Body.Close()
 
+	if c.logger.IsLevelEnabled(logger.DebugLevel) {
+		dump, _ := httputil.DumpResponse(resp, false)
+		c.logger.Debug(string(dump))
+	}
+
 	if resp.StatusCode != http.StatusOK {
 		return nil, fmt.Errorf("%s", resp.Status)
 	}

pkg/components/dialer/tcp/dialer.go

@@ -42,11 +42,33 @@ func (d *Dialer) Dial(ctx context.Context, addr string, opts ...dialer.DialOptio
 
 	dial := options.DialFunc
 	if dial != nil {
-		return dial(ctx, addr)
+		conn, err := dial(ctx, addr)
+		if err != nil {
+			d.logger.Error(err)
+		} else {
+			if d.logger.IsLevelEnabled(logger.DebugLevel) {
+				d.logger.WithFields(map[string]interface{}{
+					"src": conn.LocalAddr().String(),
+					"dst": addr,
+				}).Debug("dial with dial func")
+			}
+		}
+		return conn, err
 	}
 
 	var netd net.Dialer
-	return netd.DialContext(ctx, "tcp", addr)
+	conn, err := netd.DialContext(ctx, "tcp", addr)
+	if err != nil {
+		d.logger.Error(err)
+	} else {
+		if d.logger.IsLevelEnabled(logger.DebugLevel) {
+			d.logger.WithFields(map[string]interface{}{
+				"src": conn.LocalAddr().String(),
+				"dst": addr,
+			}).Debug("dial direct")
+		}
+	}
+	return conn, err
 }
 
 func (d *Dialer) parseMetadata(md md.Metadata) (err error) {

pkg/components/handler/http/handler.go

@@ -76,6 +76,7 @@ func (h *Handler) parseMetadata(md md.Metadata) error {
 			}
 		}
 	}
+	h.md.retryCount = md.GetInt(retryCount)
 
 	return nil
 }
@@ -260,10 +261,10 @@ func (h *Handler) dial(ctx context.Context, addr string) (conn net.Conn, err err
 		*/
 
 		conn, err = route.Dial(ctx, "tcp", addr)
-		if err != nil {
+		if err == nil {
-			h.logger.Warn("retry:", err)
+			break
-			continue
 		}
+		h.logger.Errorf("route(retry=%d): %s", i, err)
 	}
 
 	return

pkg/components/handler/http/metadata.go

@@ -8,6 +8,7 @@ const (
 	authsKey       = "auths"
 	probeResistKey = "probeResist"
 	knockKey       = "knock"
+	retryCount     = "retry"
 )
 
 type metadata struct {

pkg/config/config.go

@@ -2,6 +2,7 @@ package config
 
 import (
 	"io"
+	"time"
 
 	"github.com/spf13/viper"
 )
@@ -24,8 +25,9 @@ type LogConfig struct {
 }
 
 type LoadbalancingConfig struct {
-	Strategy string
+	Strategy    string
-	Filters  []string
+	MaxFails    int
+	FailTimeout time.Duration
 }
 
 type ListenerConfig struct {
@@ -49,6 +51,7 @@ type ConnectorConfig struct {
 }
 
 type ServiceConfig struct {
+	Name     string
 	URL      string
 	Addr     string
 	Listener *ListenerConfig