Feature: dial different NIC for all proxies (#1714)

component/dialer/dialer.go

@@ -36,12 +36,12 @@ func DialContext(ctx context.Context, network, address string, options ...Option
 }
 
 func ListenPacket(ctx context.Context, network, address string, options ...Option) (net.PacketConn, error) {
-	cfg := &config{}
+	cfg := &option{
+		interfaceName: DefaultInterface.Load(),
+	}
 
-	if !cfg.skipDefault {
-		for _, o := range DefaultOptions {
-			o(cfg)
-		}
+	for _, o := range DefaultOptions {
+		o(cfg)
 	}
 
 	for _, o := range options {
@@ -64,12 +64,12 @@ func ListenPacket(ctx context.Context, network, address string, options ...Optio
 }
 
 func dialContext(ctx context.Context, network string, destination net.IP, port string, options []Option) (net.Conn, error) {
-	opt := &config{}
+	opt := &option{
+		interfaceName: DefaultInterface.Load(),
+	}
 
-	if !opt.skipDefault {
-		for _, o := range DefaultOptions {
-			o(opt)
-		}
+	for _, o := range DefaultOptions {
+		o(opt)
 	}
 
 	for _, o := range options {

component/dialer/options.go

@@ -1,29 +1,27 @@
 package dialer
 
-var DefaultOptions []Option
+import "go.uber.org/atomic"
 
-type config struct {
-	skipDefault   bool
+var (
+	DefaultOptions   []Option
+	DefaultInterface = atomic.NewString("")
+)
+
+type option struct {
 	interfaceName string
 	addrReuse     bool
 }
 
-type Option func(opt *config)
+type Option func(opt *option)
 
 func WithInterface(name string) Option {
-	return func(opt *config) {
+	return func(opt *option) {
 		opt.interfaceName = name
 	}
 }
 
 func WithAddrReuse(reuse bool) Option {
-	return func(opt *config) {
+	return func(opt *option) {
 		opt.addrReuse = reuse
 	}
 }
-
-func WithSkipDefault(skip bool) Option {
-	return func(opt *config) {
-		opt.skipDefault = skip
-	}
-}