add max_fails & fail_timeout options support for load balancing

cmd/gost/route.go

@@ -51,11 +51,20 @@ func (r *route) parseChain() (*gost.Chain, error) {
 		}
 		ngroup.AddNode(nodes...)
 
+		maxFails := nodes[0].GetInt("max_fails")
+		if maxFails == 0 {
+			maxFails = defaultMaxFails
+		}
+		failTimeout := nodes[0].GetDuration("fail_timeout")
+		if failTimeout == 0 {
+			failTimeout = defaultFailTimeout
+		}
+
 		ngroup.SetSelector(nil,
 			gost.WithFilter(
 				&gost.FailFilter{
-					MaxFails:    defaultMaxFails,
-					FailTimeout: defaultFailTimeout,
+					MaxFails:    maxFails,
+					FailTimeout: failTimeout,
 				},
 				&gost.InvalidFilter{},
 			),

node.go

@@ -7,6 +7,7 @@ import (
 	"strconv"
 	"strings"
 	"sync"
+	"time"
 )
 
 var (
@@ -140,12 +141,21 @@ func (node *Node) GetInt(key string) int {
 	return n
 }
 
+func (node *Node) GetDuration(key string) time.Duration {
+	d, _ := time.ParseDuration(node.Values.Get(key))
+	return d
+}
+
 func (node Node) String() string {
-	if node.url == nil {
-		return fmt.Sprintf("%s+%s://%s",
-			node.Protocol, node.Transport, node.Addr)
+	var scheme string
+	if node.url != nil {
+		scheme = node.url.Scheme
+	}
+	if scheme == "" {
+		scheme = fmt.Sprintf("%s+%s", node.Protocol, node.Transport)
 	}
-	return node.url.String()
+	return fmt.Sprintf("%s://%s",
+		scheme, node.Addr)
 }
 
 // NodeGroup is a group of nodes.

socks.go

@@ -19,9 +19,9 @@ import (
 )
 
 const (
-	// MethodTLS is an extended SOCKS5 method for TLS.
+	// MethodTLS is an extended SOCKS5 method with tls encryption support.
 	MethodTLS uint8 = 0x80
-	// MethodTLSAuth is an extended SOCKS5 method for TLS+AUTH.
+	// MethodTLSAuth is an extended SOCKS5 method with tls encryption and authentication support.
 	MethodTLSAuth uint8 = 0x82
 	// MethodMux is an extended SOCKS5 method for stream multiplexing.
 	MethodMux = 0x88