Initial support for a serve port flag

cmd/helpers.go

@@ -510,6 +510,8 @@ func InstallRuntime(caller string, projectDir string, projectOptions *ProjectOpt
 // InstallBridge installs the relevant bridge javascript library
 func InstallBridge(projectDir string, projectOptions *ProjectOptions) error {
 	bridgeFileData := mewn.String("../runtime/assets/bridge.js")
+	// Inject the custom serve port
+	bridgeFileData = strings.ReplaceAll(bridgeFileData, "$SERVEPORT$", projectOptions.ServePort)
 	bridgeFileTarget := filepath.Join(projectDir, projectOptions.FrontEnd.Dir, "node_modules", "@wailsapp", "runtime", "init.js")
 	err := fs.CreateFile(bridgeFileTarget, []byte(bridgeFileData))
 	return err
@@ -561,6 +563,10 @@ func ldFlags(po *ProjectOptions, buildMode string) string {
 
 	ldflags += "-X github.com/wailsapp/wails.BuildMode=" + buildMode
 
+	// Inject port if we are using bridge mode
+	if buildMode == BuildModeBridge {
+		ldflags += " -X github.com/wailsapp/wails/lib/renderer/bridge.ServePort=" + po.ServePort
+	}
 	// If we wish to generate typescript
 	if po.typescriptDefsFilename != "" {
 		cwd, err := os.Getwd()

cmd/project.go

@@ -161,6 +161,7 @@ type ProjectOptions struct {
 	CrossCompile           bool
 	Platform               string
 	Architecture           string
+	ServePort              string
 }
 
 // Defaults sets the default project template

cmd/wails/6_serve.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"strconv"
 
 	"github.com/leaanthony/spinner"
 	"github.com/wailsapp/wails/cmd"
@@ -10,6 +11,7 @@ import (
 func init() {
 
 	var forceRebuild = false
+	var servePort = "34115"
 	var verbose = false
 	buildSpinner := spinner.NewSpinner()
 	buildSpinner.SetSpinSpeed(50)
@@ -18,7 +20,8 @@ func init() {
 	initCmd := app.Command("serve", "Run your Wails project in bridge mode").
 		LongDescription(commandDescription).
 		BoolFlag("verbose", "Verbose output", &verbose).
-		BoolFlag("f", "Force rebuild of application components", &forceRebuild)
+		BoolFlag("f", "Force rebuild of application components", &forceRebuild).
+		StringFlag("p", "Port to serve on", &servePort)
 
 	initCmd.Action(func() error {
 
@@ -34,7 +37,6 @@ func init() {
 
 		// Project options
 		projectOptions := &cmd.ProjectOptions{}
-		projectOptions.Verbose = verbose
 
 		// Check we are in project directory
 		// Check project.json loads correctly
@@ -44,6 +46,16 @@ func init() {
 			return err
 		}
 
+		// Set Verbose flag
+		projectOptions.Verbose = verbose
+
+		// Check port
+		port, err := strconv.Atoi(servePort)
+		if err != nil || port <= 0 {
+			return fmt.Errorf("invalid port value: %s", servePort)
+		}
+		projectOptions.ServePort = servePort
+
 		// Save project directory
 		projectDir := fs.Cwd()
 

lib/renderer/bridge/bridge.go

@@ -1,4 +1,4 @@
-package renderer
+package bridge
 
 import (
 	"encoding/json"
@@ -14,6 +14,10 @@ import (
 
 type messageType int
 
+// ServePort indicates which port to serve the backend on when using
+// `wails serve`
+var ServePort = "34115"
+
 const (
 	jsMessage messageType = iota
 	cssMessage
@@ -93,7 +97,7 @@ func (h *Bridge) startSession(conn *websocket.Conn) {
 
 // Run the app in Bridge mode!
 func (h *Bridge) Run() error {
-	h.server = &http.Server{Addr: ":34115"}
+	h.server = &http.Server{Addr: ":" + ServePort}
 	http.HandleFunc("/bridge", h.wsBridgeHandler)
 
 	h.log.Info("Bridge mode started.")

lib/renderer/bridge/session.go

@@ -1,4 +1,4 @@
-package renderer
+package bridge
 
 import (
 	"time"

runtime/assets/bridge.js

@@ -14,7 +14,7 @@ function init() {
 	window.wailsbridge = {
 		reconnectOverlay: null,
 		reconnectTimer: 300,
-		wsURL: 'ws://' + window.location.hostname + ':34115/bridge',
+		wsURL: 'ws://' + window.location.hostname + ':$SERVEPORT$/bridge',
 		connectionState: null,
 		config: {},
 		websocket: null,
@@ -149,38 +149,38 @@ function startBridge() {
 	function handleMessage(message) {
 		// As a bridge we ignore js and css injections
 		switch (message.data[0]) {
-		// Wails library - inject!
-		case 'w':
-			addScript(message.data.slice(1));
+			// Wails library - inject!
+			case 'w':
+				addScript(message.data.slice(1));
 
-			// Now wails runtime is loaded, wails for the ready event
-			// and callback to the main app
-			window.wails.Events.On('wails:loaded', function () {
-				window.wailsbridge.log('Wails Ready');
-				if (window.wailsbridge.callback) {
-					window.wailsbridge.log('Notifying application');
-					window.wailsbridge.callback(window.wails);
-				}
-			});
-			window.wailsbridge.log('Loaded Wails Runtime');
-			break;
+				// Now wails runtime is loaded, wails for the ready event
+				// and callback to the main app
+				window.wails.Events.On('wails:loaded', function () {
+					window.wailsbridge.log('Wails Ready');
+					if (window.wailsbridge.callback) {
+						window.wailsbridge.log('Notifying application');
+						window.wailsbridge.callback(window.wails);
+					}
+				});
+				window.wailsbridge.log('Loaded Wails Runtime');
+				break;
 			// Notifications
-		case 'n':
-			addScript(message.data.slice(1), true);
-			break;
+			case 'n':
+				addScript(message.data.slice(1), true);
+				break;
 			// Binding
-		case 'b':
-			var binding = message.data.slice(1);
-			//log("Binding: " + binding)
-			window.wails._.NewBinding(binding);
-			break;
+			case 'b':
+				var binding = message.data.slice(1);
+				//log("Binding: " + binding)
+				window.wails._.NewBinding(binding);
+				break;
 			// Call back
-		case 'c':
-			var callbackData = message.data.slice(1);
-			window.wails._.Callback(callbackData);
-			break;
-		default:
-			window.wails.Log.Error('Unknown message type received: ' + message.data[0]);
+			case 'c':
+				var callbackData = message.data.slice(1);
+				window.wails._.Callback(callbackData);
+				break;
+			default:
+				window.wails.Log.Error('Unknown message type received: ' + message.data[0]);
 		}
 	}