Add configuration item api->listen. (#3317)

* add api.listen configuration item

* add unit tests

* typo

---------

Co-authored-by: nobody <nobody@nowhere.mars>

app/commander/commander.go

@@ -21,12 +21,14 @@ type Commander struct {
 	services []Service
 	ohm      outbound.Manager
 	tag      string
+	listen   string
 }
 
 // NewCommander creates a new Commander based on the given config.
 func NewCommander(ctx context.Context, config *Config) (*Commander, error) {
 	c := &Commander{
-		tag: config.Tag,
+		tag:    config.Tag,
+		listen: config.Listen,
 	}
 
 	common.Must(core.RequireFeatures(ctx, func(om outbound.Manager) {
@@ -66,16 +68,29 @@ func (c *Commander) Start() error {
 	}
 	c.Unlock()
 
+	var listen = func(listener net.Listener) {
+		if err := c.server.Serve(listener); err != nil {
+			newError("failed to start grpc server").Base(err).AtError().WriteToLog()
+		}
+	}
+
+	if len(c.listen) > 0 {
+		if l, err := net.Listen("tcp", c.listen); err != nil {
+			newError("API server failed to listen on ", c.listen).Base(err).AtError().WriteToLog()
+			return err
+		} else {
+			newError("API server listening on ", l.Addr()).AtInfo().WriteToLog()
+			go listen(l)
+		}
+		return nil
+	}
+
 	listener := &OutboundListener{
 		buffer: make(chan net.Conn, 4),
 		done:   done.New(),
 	}
 
-	go func() {
-		if err := c.server.Serve(listener); err != nil {
-			newError("failed to start grpc server").Base(err).AtError().WriteToLog()
-		}
-	}()
+	go listen(listener)
 
 	if err := c.ohm.RemoveHandler(context.Background(), c.tag); err != nil {
 		newError("failed to remove existing handler").WriteToLog()

app/commander/config.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.33.0
-// 	protoc        v4.23.1
+// 	protoc-gen-go v1.28.1
+// 	protoc        v4.25.3
 // source: app/commander/config.proto
 
 package commander
@@ -29,6 +29,8 @@ type Config struct {
 
 	// Tag of the outbound handler that handles grpc connections.
 	Tag string `protobuf:"bytes,1,opt,name=tag,proto3" json:"tag,omitempty"`
+	// Network address of commander grpc service.
+	Listen string `protobuf:"bytes,3,opt,name=listen,proto3" json:"listen,omitempty"`
 	// Services that supported by this server. All services must implement Service
 	// interface.
 	Service []*serial.TypedMessage `protobuf:"bytes,2,rep,name=service,proto3" json:"service,omitempty"`
@@ -73,6 +75,13 @@ func (x *Config) GetTag() string {
 	return ""
 }
 
+func (x *Config) GetListen() string {
+	if x != nil {
+		return x.Listen
+	}
+	return ""
+}
+
 func (x *Config) GetService() []*serial.TypedMessage {
 	if x != nil {
 		return x.Service
@@ -127,20 +136,21 @@ var file_app_commander_config_proto_rawDesc = []byte{
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 }
 
 var (

app/commander/config.proto

@@ -12,6 +12,10 @@ import "common/serial/typed_message.proto";
 message Config {
   // Tag of the outbound handler that handles grpc connections.
   string tag = 1;
+
+  // Network address of commander grpc service.
+  string listen = 3;
+
   // Services that supported by this server. All services must implement Service
   // interface.
   repeated xray.common.serial.TypedMessage service = 2;