feat: config initialization routines

modules/server/helpers.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"fmt"
+	"reflect"
+)
+
+func printStructTags(f reflect.Value) {
+	for i := 0; i < f.NumField(); i++ {
+		field := f.Type().Field(i)
+		tag := field.Tag
+		fmt.Printf("Field: %v.\nEnvironment variable: %v.\n", field.Name, tag.Get("env"))
+	}
+}
+
+func setField(obj interface{}, name string, value interface{}) error {
+	v := reflect.ValueOf(obj)
+
+	if v.Kind() != reflect.Ptr || v.Elem().Kind() != reflect.Struct {
+		return fmt.Errorf("expected pointer to a struct")
+	}
+
+	v = v.Elem()
+	field := v.FieldByName(name)
+
+	if !field.IsValid() {
+		return fmt.Errorf("no such field: %s", name)
+	}
+	if !field.CanSet() {
+		return fmt.Errorf("cannot set field: %s", name)
+	}
+
+	val := reflect.ValueOf(value)
+
+	if field.Type() != val.Type() {
+		return fmt.Errorf("provided value type (%s) doesn't match field type (%s)", val.Type(), field.Type())
+	}
+
+	field.Set(val)
+	return nil
+}