fix(dev): fix frontend dev server startup race

go.work.sum

@@ -1,41 +1,82 @@
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v3/cmd/wails3/main.go

@@ -95,6 +95,7 @@ func main() {
 
 	tool := app.NewSubCommand("tool", "Various tools")
 	tool.NewSubCommandFunction("checkport", "Checks if a port is open. Useful for testing if vite is running.", commands.ToolCheckPort)
+	tool.NewSubCommandFunction("waitport", "Waits for a port to open. Useful for gating dependent development tasks.", commands.ToolWaitPort)
 	tool.NewSubCommandFunction("watcher", "Watches files and runs a command when they change", commands.Watcher)
 	tool.NewSubCommandFunction("cp", "Copy files", commands.Cp)
 	tool.NewSubCommandFunction("buildinfo", "Show Build Info", commands.BuildInfo)

v3/internal/commands/build_assets/Taskfile.tmpl.yml

@@ -210,6 +210,13 @@ tasks:
     cmds:
       - task: frontend:dev:{{.Opn}}.PACKAGE_MANAGER{{.Cls}}
 
+  dev:wait:
+    summary: Waits for the frontend development server
+    vars:
+      TIMEOUT: 60
+    cmds:
+      - wails3 tool waitport --timeout {{.Opn}}.TIMEOUT{{.Cls}}
+
   frontend:dev:npm:
     dir: frontend
     cmds:

v3/internal/commands/build_assets/config.yml

@@ -56,6 +56,8 @@ dev_mode:
       type: blocking
     - cmd: wails3 task common:dev:frontend
       type: background
+    - cmd: wails3 task common:dev:wait
+      type: once
     - cmd: wails3 task run
       type: primary
 
@@ -76,4 +78,4 @@ fileAssociations:
 
 # Other data
 other:
-  - name: My Other Data
+  - name: My Other Data

v3/internal/commands/dev_config_test.go

@@ -0,0 +1,47 @@
+package commands
+
+import (
+	"testing"
+
+	"github.com/atterpac/refresh/process"
+	"github.com/stretchr/testify/require"
+	"gopkg.in/yaml.v3"
+)
+
+func TestDevConfigGatesApplicationOnFrontendReadiness(t *testing.T) {
+	data, err := buildAssets.ReadFile("build_assets/config.yml")
+	require.NoError(t, err)
+
+	var config struct {
+		DevMode struct {
+			Executes []process.Execute `yaml:"executes"`
+		} `yaml:"dev_mode"`
+	}
+	require.NoError(t, yaml.Unmarshal(data, &config))
+
+	require.Len(t, config.DevMode.Executes, 4)
+	require.Equal(t, process.Background, config.DevMode.Executes[1].Type)
+	require.Equal(t, "wails3 task common:dev:wait", config.DevMode.Executes[2].Cmd)
+	require.Equal(t, process.Once, config.DevMode.Executes[2].Type)
+	require.Equal(t, process.Primary, config.DevMode.Executes[3].Type)
+}
+
+func TestFrontendDevServerTimeoutIsTaskLocal(t *testing.T) {
+	data, err := buildAssets.ReadFile("build_assets/Taskfile.tmpl.yml")
+	require.NoError(t, err)
+
+	var taskfile struct {
+		Tasks map[string]yaml.Node `yaml:"tasks"`
+	}
+	require.NoError(t, yaml.Unmarshal(data, &taskfile))
+
+	waitTaskNode, exists := taskfile.Tasks["dev:wait"]
+	require.True(t, exists)
+	var waitTask struct {
+		Vars map[string]int `yaml:"vars"`
+		Cmds []string       `yaml:"cmds"`
+	}
+	require.NoError(t, waitTaskNode.Decode(&waitTask))
+	require.Equal(t, 60, waitTask.Vars["TIMEOUT"])
+	require.Equal(t, []string{"wails3 tool waitport --timeout {{.Opn}}.TIMEOUT{{.Cls}}"}, waitTask.Cmds)
+}

v3/internal/commands/tool_waitport.go

@@ -0,0 +1,63 @@
+package commands
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"time"
+)
+
+const portWaitInterval = 100 * time.Millisecond
+
+type ToolWaitPortOptions struct {
+	Host    string `name:"h" description:"Host to check" default:"localhost"`
+	Port    int    `name:"p" description:"Port to check; defaults to WAILS_VITE_PORT when set"`
+	Timeout int    `name:"timeout" description:"Maximum number of seconds to wait for the port to open" default:"60"`
+}
+
+func waitForPort(check func() bool, timeout time.Duration) bool {
+	if check() {
+		return true
+	}
+	if timeout <= 0 {
+		return false
+	}
+
+	ticker := time.NewTicker(portWaitInterval)
+	defer ticker.Stop()
+	timer := time.NewTimer(timeout)
+	defer timer.Stop()
+
+	for {
+		select {
+		case <-ticker.C:
+			if check() {
+				return true
+			}
+		case <-timer.C:
+			return false
+		}
+	}
+}
+
+func ToolWaitPort(options *ToolWaitPortOptions) error {
+	DisableFooter = true
+
+	if options.Port == 0 {
+		port := os.Getenv(wailsVitePort)
+		if port == "" {
+			return fmt.Errorf("please use the -p flag to specify a port or set %s", wailsVitePort)
+		}
+		var err error
+		options.Port, err = strconv.Atoi(port)
+		if err != nil {
+			return fmt.Errorf("invalid %s value %q: %w", wailsVitePort, port, err)
+		}
+	}
+
+	timeout := time.Duration(options.Timeout) * time.Second
+	if !waitForPort(func() bool { return isPortOpen(options.Host, options.Port) }, timeout) {
+		return fmt.Errorf("timed out after %s waiting for port %d to open on %s", timeout, options.Port, options.Host)
+	}
+	return nil
+}

v3/internal/commands/tool_waitport_test.go

@@ -0,0 +1,36 @@
+package commands
+
+import (
+	"testing"
+	"time"
+)
+
+func TestWaitForPortRetriesUntilReady(t *testing.T) {
+	attempts := 0
+	ready := waitForPort(func() bool {
+		attempts++
+		return attempts == 3
+	}, time.Second)
+
+	if !ready {
+		t.Fatal("waitForPort reported that the port was unavailable")
+	}
+	if attempts != 3 {
+		t.Fatalf("attempt count = %d, want 3", attempts)
+	}
+}
+
+func TestWaitForPortDoesNotRetryWithoutTimeout(t *testing.T) {
+	attempts := 0
+	ready := waitForPort(func() bool {
+		attempts++
+		return false
+	}, 0)
+
+	if ready {
+		t.Fatal("waitForPort reported that the port was available")
+	}
+	if attempts != 1 {
+		t.Fatalf("attempt count = %d, want 1", attempts)
+	}
+}

v3/internal/commands/watcher_test.go

@@ -3,28 +3,28 @@ package commands
 import (
 	"testing"
 
-	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestEnsureIgnored(t *testing.T) {
 	t.Run("adds pattern when not present", func(t *testing.T) {
 		list := []string{".gitignore", ".DS_Store"}
 		ensureIgnored(&list, "*_test.go")
-		assert.Contains(t, list, "*_test.go")
-		assert.Len(t, list, 3)
+		require.Contains(t, list, "*_test.go")
+		require.Len(t, list, 3)
 	})
 
 	t.Run("does not duplicate pattern when already present", func(t *testing.T) {
 		list := []string{".gitignore", "*_test.go"}
 		ensureIgnored(&list, "*_test.go")
-		assert.Contains(t, list, "*_test.go")
-		assert.Len(t, list, 2)
+		require.Contains(t, list, "*_test.go")
+		require.Len(t, list, 2)
 	})
 
 	t.Run("adds to empty list", func(t *testing.T) {
 		var list []string
 		ensureIgnored(&list, "*_test.go")
-		assert.Contains(t, list, "*_test.go")
-		assert.Len(t, list, 1)
+		require.Contains(t, list, "*_test.go")
+		require.Len(t, list, 1)
 	})
 }

v3/pkg/application/application.go

@@ -571,12 +571,6 @@ func (a *App) Run() error {
 	// Ensure application context is cancelled in case of failures.
 	defer a.cancel()
 
-	// Call post-create hooks
-	err := a.preRun()
-	if err != nil {
-		return err
-	}
-
 	a.impl = newPlatformApp(a)
 
 	// Ensure services are shut down in case of failures.
@@ -602,13 +596,12 @@ func (a *App) Run() error {
 			a.options.Services = services[:i+1]
 		}
 
-
-	// Start the MCP server when the application is built with -tags mcp.
-	// All configuration is read from environment variables (WAILS_MCP_HOST,
-	// WAILS_MCP_PORT, WAILS_MCP_TIMEOUT, WAILS_MCP_HIDE_CURSOR).
-	if err := startMCPServer(a); err != nil {
-		return fmt.Errorf("mcp: %w", err)
-	}
+		// Start the MCP server when the application is built with -tags mcp.
+		// All configuration is read from environment variables (WAILS_MCP_HOST,
+		// WAILS_MCP_PORT, WAILS_MCP_TIMEOUT, WAILS_MCP_HIDE_CURSOR).
+		if err := startMCPServer(a); err != nil {
+			return fmt.Errorf("mcp: %w", err)
+		}
 
 		go func() {
 			for {

v3/pkg/application/application_dev.go

@@ -2,50 +2,13 @@
 
 package application
 
-import (
-	"net/http"
-	"time"
-
-	"github.com/wailsapp/wails/v3/internal/assetserver"
-)
-
-var devMode = false
-
-func (a *App) preRun() error {
-	// Check for frontend server url
-	frontendURL := assetserver.GetDevServerURL()
-	if frontendURL != "" {
-		devMode = true
-		// We want to check if the frontend server is running by trying to http get the url
-		// and if it is not, we wait 500ms and try again for a maximum of 10 times. If it is
-		// still not available, we return an error.
-		// This is to allow the frontend server to start up before the backend server.
-		client := http.Client{}
-		a.Logger.Info("Waiting for frontend dev server to start...", "url", frontendURL)
-		for i := 0; i < 10; i++ {
-			_, err := client.Get(frontendURL)
-			if err == nil {
-				a.Logger.Info("Connected to frontend dev server!")
-				return nil
-			}
-			// Wait 500ms
-			time.Sleep(500 * time.Millisecond)
-			if i%2 == 0 {
-				a.Logger.Info("Retrying...")
-			}
-		}
-		a.fatal("unable to connect to frontend server. Please check it is running - FRONTEND_DEVSERVER_URL='%s'", frontendURL)
-	}
-	return nil
-}
+import "github.com/wailsapp/wails/v3/internal/assetserver"
 
 func (a *App) postQuit() {
-	if devMode {
-		a.Logger.Info("The application has terminated, but the watcher is still running.")
-		a.Logger.Info("To terminate the watcher, press CTRL+C")
+	if assetserver.GetDevServerURL() == "" {
+		return
 	}
-}
-
-func (a *App) enableDevTools() {
 
+	a.Logger.Info("The application has terminated, but the watcher is still running.")
+	a.Logger.Info("To terminate the watcher, press CTRL+C")
 }