chore: change config loading priority

prestart/init_config_driver.go

@@ -2,28 +2,22 @@ package prestart
 
 import (
 	"bytes"
+	"github.com/cockroachdb/errors"
+	"github.com/hitokoto-osc/Moe/config"
 	"github.com/hitokoto-osc/Moe/logging"
+	"github.com/spf13/viper"
 	"go.uber.org/zap"
 	"os"
 	"strings"
-
-	"github.com/hitokoto-osc/Moe/config"
-	"github.com/spf13/viper"
 )
 
 // The Config Parse Driver is served by viper
 func initConfigDriver() {
 	logger := logging.GetLogger()
 	defer logger.Sync()
 	config.SetDefault()
-	// Parse env config
-	viper.SetEnvPrefix("moe") // like: MOE_PORT=8000
-	viper.AutomaticEnv()
-	viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
-
 	// Set default viper information
 	viper.SetConfigName("config")
-	viper.SetConfigType("toml") // Toml is the best!
 	if config.File != "" {
 		content, err := os.ReadFile(config.File)
 		if err != nil {
@@ -53,8 +47,20 @@ func initConfigDriver() {
 		viper.AddConfigPath("../config")
 		err := viper.ReadInConfig()
 		if err != nil {
-			logger.Fatal("[init] Fatal error while reading config file.", zap.Error(err))
+			var e viper.ConfigFileNotFoundError
+			if !errors.As(err, &e) {
+				logger.Fatal("[init] Fatal error while reading config file.", zap.Error(err))
+			}
+			logger.Warn("[init] No config file detected, reading config from env.")
 		}
 	}
+	// Parse env config
+	viper.SetEnvPrefix("moe") // like: MOE_PORT=8000
+	viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
+	viper.AutomaticEnv()
+	logger.Debug("[init] config is parsed.",
+		zap.String("config_file_used", viper.ConfigFileUsed()),
+		zap.Any("settings", viper.AllSettings()),
+	)
 	config.Inject()
 }