fix: don't panic when the database connection cannot be established a…

config/module.go

@@ -92,9 +92,9 @@ func (m Module) ProvideCommand(command *cobra.Command) {
 				}
 				exportedConfigs = copy
 			}
-			os.MkdirAll(filepath.Dir(outputFile), 0644)
+			os.MkdirAll(filepath.Dir(outputFile), os.ModePerm)
 			targetFile, err = os.OpenFile(outputFile,
-				handler.flags(), 0644)
+				handler.flags(), os.ModePerm)
 			if err != nil {
 				return errors.Wrap(err, "failed to open config file")
 			}

otgorm/dependency.go

@@ -1,7 +1,9 @@
 package otgorm
 
 import (
+	"errors"
 	"fmt"
+	"net"
 
 	"github.com/DoNewsCode/core/config"
 	"github.com/DoNewsCode/core/contract"
@@ -160,9 +162,13 @@ func provideGormConfig(l log.Logger, conf *databaseConf) *gorm.Config {
 // will fail when initializing dependencies.
 func provideGormDB(dialector gorm.Dialector, config *gorm.Config, tracer opentracing.Tracer) (*gorm.DB, func(), error) {
 	db, err := gorm.Open(dialector, config)
-	if err != nil {
+
+	var nerr *net.OpError
+
+	if err != nil && !errors.As(err, &nerr) {
 		return nil, nil, err
 	}
+
 	if tracer != nil {
 		AddGormCallbacks(db, tracer)
 	}

otgorm/dependency_test.go

@@ -17,11 +17,11 @@ func TestProvideDBFactory(t *testing.T) {
 		Conf: config.MapAdapter{"gorm": map[string]databaseConf{
 			"default": {
 				Database: "sqlite",
-				Dsn:      "",
+				Dsn:      ":memory:",
 			},
 			"alternative": {
-				Database: "sqlite",
-				Dsn:      "",
+				Database: "mysql",
+				Dsn:      "root@tcp(127.0.0.1:3306)/app?charset=utf8mb4&parseTime=True&loc=Local",
 			},
 		}},
 		Logger: log.NewNopLogger(),