Improved import, by group improt.

errors/gerror/gerror_error.go

@@ -22,7 +22,7 @@ import (
 type Error struct {
 	error error      // Wrapped error.
 	stack stack      // Stack array, which records the stack information when this error is created or wrapped.
-	text  string     // Error text, which is created by New* functions.
+	text  string     // Custom Error text when Error is created, might be empty when its code is not nil.
 	code  gcode.Code // Error code if necessary.
 }
 
@@ -32,8 +32,7 @@ const (
 )
 
 var (
-	// goRootForFilter is used for stack filtering purpose.
-	// Mainly for development environment.
+	// goRootForFilter is used for stack filtering in development environment purpose.
 	goRootForFilter = runtime.GOROOT()
 )
 
@@ -108,18 +107,18 @@ func (err *Error) Format(s fmt.State, verb rune) {
 		switch {
 		case s.Flag('-'):
 			if err.text != "" {
-				io.WriteString(s, err.text)
+				_, _ = io.WriteString(s, err.text)
 			} else {
-				io.WriteString(s, err.Error())
+				_, _ = io.WriteString(s, err.Error())
 			}
 		case s.Flag('+'):
 			if verb == 's' {
-				io.WriteString(s, err.Stack())
+				_, _ = io.WriteString(s, err.Stack())
 			} else {
-				io.WriteString(s, err.Error()+"\n"+err.Stack())
+				_, _ = io.WriteString(s, err.Error()+"\n"+err.Stack())
 			}
 		default:
-			io.WriteString(s, err.Error())
+			_, _ = io.WriteString(s, err.Error())
 		}
 	}
 }
@@ -177,6 +176,14 @@ func (err *Error) Next() error {
 	return err.error
 }
 
+// SetCode updates the internal code with given code.
+func (err *Error) SetCode(code gcode.Code) {
+	if err == nil {
+		return
+	}
+	err.code = code
+}
+
 // MarshalJSON implements the interface MarshalJSON for json.Marshal.
 // Note that do not use pointer as its receiver here.
 func (err *Error) MarshalJSON() ([]byte, error) {

errors/gerror/gerror_z_unit_test.go

@@ -311,6 +311,18 @@ func Test_Code(t *testing.T) {
 	})
 }
 
+func Test_SetCode(t *testing.T) {
+	gtest.C(t, func(t *gtest.T) {
+		err := gerror.New("123")
+		t.Assert(gerror.Code(err), -1)
+		t.Assert(err.Error(), "123")
+
+		err.(*gerror.Error).SetCode(gcode.CodeValidationFailed)
+		t.Assert(gerror.Code(err), gcode.CodeValidationFailed)
+		t.Assert(err.Error(), "123")
+	})
+}
+
 func Test_Json(t *testing.T) {
 	gtest.C(t, func(t *gtest.T) {
 		err := gerror.Wrap(gerror.New("1"), "2")