Move the config package to a singleton pattern

internal/config/config.go

@@ -16,9 +16,13 @@ type AppConfig struct {
 	LogAddSource   bool   `yaml:"log_add_source"`
 }
 
-func Parse() (*AppConfig, error) {
+var config *AppConfig
-	var appConfig *AppConfig
 
+func Get() *AppConfig {
+	return config
+}
+
+func Init() error {
 	setDefaults()
 
 	// automatically populate config with any matching environment vars
@@ -31,15 +35,15 @@ func Parse() (*AppConfig, error) {
 
 	err := viper.ReadInConfig()
 	if err != nil {
-		return nil, fmt.Errorf("error reading configs: %s", err)
+		return fmt.Errorf("error reading configs: %s", err)
 	}
 
-	err = viper.Unmarshal(&appConfig)
+	err = viper.Unmarshal(&config)
 	if err != nil {
-		return nil, fmt.Errorf("error unmarshaling configs: %s", err)
+		return fmt.Errorf("error unmarshaling configs: %s", err)
 	}
 
-	return appConfig, nil
+	return nil
 }
 
 func setDefaults() {

internal/logging/logging.go

@@ -16,20 +16,21 @@ var (
 	logger Logger
 )
 
-func Init(appConfig *config.AppConfig) {
+func Init() {
+	cfg := config.Get()
 
 	lj := &lumberjack.Logger{
-		Filename:   filepath.Join(appConfig.LogDir, appConfig.LogFile),
+		Filename:   filepath.Join(cfg.LogDir, cfg.LogFile),
-		MaxSize:    appConfig.LogMaxSizeMB,
+		MaxSize:    cfg.LogMaxSizeMB,
-		MaxBackups: appConfig.LogMaxBackups,
+		MaxBackups: cfg.LogMaxBackups,
-		MaxAge:     appConfig.LogMaxAgeDays,
+		MaxAge:     cfg.LogMaxAgeDays,
-		Compress:   appConfig.LogCompression,
+		Compress:   cfg.LogCompression,
 	}
 
 	logger = Logger{
 		slog.New(
 			slog.NewJSONHandler(lj, &slog.HandlerOptions{
-				AddSource: appConfig.LogAddSource,
+				AddSource: cfg.LogAddSource,
 			}),
 		),
 	}

main.go

@@ -13,8 +13,6 @@ import (
 
 var (
 	token = flag.String("token", "", "Bot authentication token")
-
-	appConfig *config.AppConfig
 )
 
 func main() {
@@ -22,13 +20,13 @@ func main() {
 
 	var err error
 
-	appConfig, err = config.Parse()
+	err = config.Init()
 
 	if err != nil {
 		log.Fatal(err)
 	}
 
-	logging.Init(appConfig)
+	logging.Init()
 
 	err = startBot()