chore: update option checks to use IsZeroOptions

Author: wwqgtxx

adapter/outbound/snell.go

@@ -76,7 +76,7 @@ func (s *Snell) writeHeaderContext(ctx context.Context, c net.Conn, metadata *C.
 
 // DialContext implements C.ProxyAdapter
 func (s *Snell) DialContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (_ C.Conn, err error) {
-	if s.version == snell.Version2 && len(opts) == 0 {
+	if s.version == snell.Version2 && dialer.IsZeroOptions(opts) {
 		c, err := s.pool.Get()
 		if err != nil {
 			return nil, err

adapter/outbound/trojan.go

@@ -131,7 +131,7 @@ func (t *Trojan) writeHeaderContext(ctx context.Context, c net.Conn, metadata *C
 // DialContext implements C.ProxyAdapter
 func (t *Trojan) DialContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (_ C.Conn, err error) {
 	// gun transport
-	if t.transport != nil && len(opts) == 0 {
+	if t.transport != nil && dialer.IsZeroOptions(opts) {
 		c, err := gun.StreamGunWithTransport(t.transport, t.gunConfig)
 		if err != nil {
 			return nil, err
@@ -181,7 +181,7 @@ func (t *Trojan) ListenPacketContext(ctx context.Context, metadata *C.Metadata,
 	var c net.Conn
 
 	// grpc transport
-	if t.transport != nil && len(opts) == 0 {
+	if t.transport != nil && dialer.IsZeroOptions(opts) {
 		c, err = gun.StreamGunWithTransport(t.transport, t.gunConfig)
 		if err != nil {
 			return nil, fmt.Errorf("%s connect error: %w", t.addr, err)

adapter/outbound/vless.go

@@ -233,7 +233,7 @@ func (v *Vless) streamTLSConn(ctx context.Context, conn net.Conn, isH2 bool) (ne
 // DialContext implements C.ProxyAdapter
 func (v *Vless) DialContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (_ C.Conn, err error) {
 	// gun transport
-	if v.transport != nil && len(opts) == 0 {
+	if v.transport != nil && dialer.IsZeroOptions(opts) {
 		c, err := gun.StreamGunWithTransport(v.transport, v.gunConfig)
 		if err != nil {
 			return nil, err
@@ -287,7 +287,7 @@ func (v *Vless) ListenPacketContext(ctx context.Context, metadata *C.Metadata, o
 	}
 	var c net.Conn
 	// gun transport
-	if v.transport != nil && len(opts) == 0 {
+	if v.transport != nil && dialer.IsZeroOptions(opts) {
 		c, err = gun.StreamGunWithTransport(v.transport, v.gunConfig)
 		if err != nil {
 			return nil, err

adapter/outbound/vmess.go

@@ -288,7 +288,7 @@ func (v *Vmess) streamConnConntext(ctx context.Context, c net.Conn, metadata *C.
 // DialContext implements C.ProxyAdapter
 func (v *Vmess) DialContext(ctx context.Context, metadata *C.Metadata, opts ...dialer.Option) (_ C.Conn, err error) {
 	// gun transport
-	if v.transport != nil && len(opts) == 0 {
+	if v.transport != nil && dialer.IsZeroOptions(opts) {
 		c, err := gun.StreamGunWithTransport(v.transport, v.gunConfig)
 		if err != nil {
 			return nil, err
@@ -339,7 +339,7 @@ func (v *Vmess) ListenPacketContext(ctx context.Context, metadata *C.Metadata, o
 	}
 	var c net.Conn
 	// gun transport
-	if v.transport != nil && len(opts) == 0 {
+	if v.transport != nil && dialer.IsZeroOptions(opts) {
 		c, err = gun.StreamGunWithTransport(v.transport, v.gunConfig)
 		if err != nil {
 			return nil, err

component/dialer/options.go

@@ -115,3 +115,11 @@ func WithOption(o option) Option {
 		*opt = o
 	}
 }
+
+func IsZeroOptions(opts []Option) bool {
+	var opt option
+	for _, o := range opts {
+		o(&opt)
+	}
+	return opt == option{}
+}