chore(config): merge userConfig with defaultConfig and add a lock (#164)

* chore(config): merge userConfig with defaultConfig and add a lock

* chore(config): remove lock for LoadConfig

config.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
+	"sync"
 )
 
 type WakeOnLanDevice struct {
@@ -40,25 +41,28 @@ var defaultConfig = &Config{
 	DisplayOffAfterSec:   1800, // 30 minutes
 }
 
-var config *Config
+var (
+	config     *Config
+	configLock = &sync.Mutex{}
+)
 
 func LoadConfig() {
 	if config != nil {
+		logger.Info("config already loaded, skipping")
 		return
 	}
 
 	file, err := os.Open(configPath)
 	if err != nil {
 		logger.Debug("default config file doesn't exist, using default")
-		config = defaultConfig
 		return
 	}
 	defer file.Close()
 
-	var loadedConfig Config
+	// load and merge the default config with the user config
+	loadedConfig := *defaultConfig
 	if err := json.NewDecoder(file).Decode(&loadedConfig); err != nil {
 		logger.Errorf("config file JSON parsing failed, %v", err)
-		config = defaultConfig
 		return
 	}
 
@@ -66,6 +70,9 @@ func LoadConfig() {
 }
 
 func SaveConfig() error {
+	configLock.Lock()
+	defer configLock.Unlock()
+
 	file, err := os.Create(configPath)
 	if err != nil {
 		return fmt.Errorf("failed to create config file: %w", err)

display.go

@@ -209,7 +209,6 @@ func watchTsEvents() {
 // if they're not already set. This is done separately to the init routine as the "never dim"
 // option has the value set to zero, but time.NewTicker only accept positive values.
 func startBacklightTickers() {
-	LoadConfig()
 	// Don't start the tickers if the display is switched off.
 	// Set the display to off if that's the case.
 	if config.DisplayMaxBrightness == 0 {

jsonrpc.go

@@ -194,7 +194,6 @@ func rpcSetEDID(edid string) error {
 	}
 
 	// Save EDID to config, allowing it to be restored on reboot.
-	LoadConfig()
 	config.EdidString = edid
 	SaveConfig()
 
@@ -235,8 +234,6 @@ func rpcTryUpdate() error {
 }
 
 func rpcSetBacklightSettings(params BacklightSettings) error {
-	LoadConfig()
-
 	blConfig := params
 
 	// NOTE: by default, the frontend limits the brightness to 64, as that's what the device originally shipped with.
@@ -275,8 +272,6 @@ func rpcSetBacklightSettings(params BacklightSettings) error {
 }
 
 func rpcGetBacklightSettings() (*BacklightSettings, error) {
-	LoadConfig()
-
 	return &BacklightSettings{
 		MaxBrightness: config.DisplayMaxBrightness,
 		DimAfter:      int(config.DisplayDimAfterSec),
@@ -544,7 +539,6 @@ func rpcSetUsbEmulationState(enabled bool) error {
 }
 
 func rpcGetWakeOnLanDevices() ([]WakeOnLanDevice, error) {
-	LoadConfig()
 	if config.WakeOnLanDevices == nil {
 		return []WakeOnLanDevice{}, nil
 	}
@@ -556,13 +550,11 @@ type SetWakeOnLanDevicesParams struct {
 }
 
 func rpcSetWakeOnLanDevices(params SetWakeOnLanDevicesParams) error {
-	LoadConfig()
 	config.WakeOnLanDevices = params.Devices
 	return SaveConfig()
 }
 
 func rpcResetConfig() error {
-	LoadConfig()
 	config = defaultConfig
 	if err := SaveConfig(); err != nil {
 		return fmt.Errorf("failed to reset config: %w", err)

native.go

@@ -311,7 +311,6 @@ func ensureBinaryUpdated(destPath string) error {
 // Restore the HDMI EDID value from the config.
 // Called after successful connection to jetkvm_native.
 func restoreHdmiEdid() {
-	LoadConfig()
 	if config.EdidString != "" {
 		logger.Infof("Restoring HDMI EDID to %v", config.EdidString)
 		_, err := CallCtrlAction("set_edid", map[string]interface{}{"edid": config.EdidString})

web.go

@@ -147,8 +147,6 @@ func handleWebRTCSession(c *gin.Context) {
 }
 
 func handleLogin(c *gin.Context) {
-	LoadConfig()
-
 	if config.LocalAuthMode == "noPassword" {
 		c.JSON(http.StatusBadRequest, gin.H{"error": "Login is disabled in noPassword mode"})
 		return
@@ -161,7 +159,6 @@ func handleLogin(c *gin.Context) {
 		return
 	}
 
-	LoadConfig()
 	err := bcrypt.CompareHashAndPassword([]byte(config.HashedPassword), []byte(req.Password))
 	if err != nil {
 		c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid password"})
@@ -177,7 +174,6 @@ func handleLogin(c *gin.Context) {
 }
 
 func handleLogout(c *gin.Context) {
-	LoadConfig()
 	config.LocalAuthToken = ""
 	if err := SaveConfig(); err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to save configuration"})
@@ -191,8 +187,6 @@ func handleLogout(c *gin.Context) {
 
 func protectedMiddleware() gin.HandlerFunc {
 	return func(c *gin.Context) {
-		LoadConfig()
-
 		if config.LocalAuthMode == "noPassword" {
 			c.Next()
 			return
@@ -221,8 +215,6 @@ func RunWebServer() {
 }
 
 func handleDevice(c *gin.Context) {
-	LoadConfig()
-
 	response := LocalDevice{
 		AuthMode: &config.LocalAuthMode,
 		DeviceID: GetDeviceID(),
@@ -232,8 +224,6 @@ func handleDevice(c *gin.Context) {
 }
 
 func handleCreatePassword(c *gin.Context) {
-	LoadConfig()
-
 	if config.HashedPassword != "" {
 		c.JSON(http.StatusBadRequest, gin.H{"error": "Password already set"})
 		return
@@ -274,8 +264,6 @@ func handleCreatePassword(c *gin.Context) {
 }
 
 func handleUpdatePassword(c *gin.Context) {
-	LoadConfig()
-
 	if config.HashedPassword == "" {
 		c.JSON(http.StatusBadRequest, gin.H{"error": "Password is not set"})
 		return
@@ -319,8 +307,6 @@ func handleUpdatePassword(c *gin.Context) {
 }
 
 func handleDeletePassword(c *gin.Context) {
-	LoadConfig()
-
 	if config.HashedPassword == "" {
 		c.JSON(http.StatusBadRequest, gin.H{"error": "Password is not set"})
 		return
@@ -357,8 +343,6 @@ func handleDeletePassword(c *gin.Context) {
 }
 
 func handleDeviceStatus(c *gin.Context) {
-	LoadConfig()
-
 	response := DeviceStatus{
 		IsSetup: config.LocalAuthMode != "",
 	}
@@ -367,8 +351,6 @@ func handleDeviceStatus(c *gin.Context) {
 }
 
 func handleDeviceUIConfig(c *gin.Context) {
-	LoadConfig()
-
 	config, _ := json.Marshal(gin.H{
 		"CLOUD_API":      config.CloudURL,
 		"DEVICE_VERSION": builtAppVersion,
@@ -384,8 +366,6 @@ func handleDeviceUIConfig(c *gin.Context) {
 }
 
 func handleSetup(c *gin.Context) {
-	LoadConfig()
-
 	// Check if the device is already set up
 	if config.LocalAuthMode != "" || config.HashedPassword != "" {
 		c.JSON(http.StatusBadRequest, gin.H{"error": "Device is already set up"})