basic conf for loader

pkg/set/set.go

@@ -0,0 +1,20 @@
+package set
+
+import (
+	"errors"
+	"reflect"
+)
+
+func Field(dst interface{}, fieldName string, value interface{}) error {
+
+	valDst := reflect.ValueOf(dst).Elem()
+	dstField := valDst.FieldByName(fieldName)
+
+	val := reflect.ValueOf(value)
+	if dstField.Kind() != val.Kind() {
+		return errors.New("value-Type does not match to field")
+	}
+
+	dstField.Set(val)
+	return nil
+}

pkg/set/set_test.go

@@ -0,0 +1,30 @@
+package set
+
+import "testing"
+
+func TestField(t *testing.T) {
+	input := struct {
+		MyString string
+		MyInt    int
+		MyBool   bool
+	}{}
+	value := "abc"
+	Field(&input, "MyString", value)
+	if input.MyString != value {
+		t.Errorf("got: %s; want: %s", input.MyString, value)
+	}
+	vInt := 2
+	Field(&input, "MyInt", vInt)
+	if input.MyInt != vInt {
+		t.Errorf("MyInt: %d, want: %d", input.MyInt, vInt)
+	}
+	err := Field(&input, "MyInt", "vInt")
+	if err == nil {
+		t.Error("expect error, when wrong value-Type")
+	}
+	err = Field(&input, "NoField", "jjj")
+	if err == nil {
+		t.Error("expect error, when field not exists")
+	}
+
+}