gowalker

Gowalker is a Go package enabling in-depth reflection and inspection of objects and their values with various customizable options and filters. Gowalker can walk through nested interfaces, pointers, structs, maps, and slices.

Installation

go get -u github.com/ashtonian/gowalker

Usage

Basic Usage

Here’s a simple example demonstrating the basic usage of gowalker to trim strings from a struct:

func main() {
    obj := struct{Name: " Example ", Value: " Value "}

    fn := func(v reflect.Value, meta gowalker.ObjMeta) error {
            v.SetString(strings.TrimSpace(v.String()))
        }
        return nil
    }

    gowalker.Walk(&obj, fn, TypeIsOneOf(reflect.String))
}

Options

Gowalker offers options like MaxDepth, PrivateFields, OnlySettable, and WithTagFilter to customize the walking process according to your needs.

Examples

Sync Map with Paths

To store all the visited paths in a sync.Map, use the example below:

// show path
func main() {
 obj := MyStruct{Name: "Example", Value: 42}
 var syncMap sync.Map

 _, _ = gowalker.Walk(obj, func(v reflect.Value, meta gowalker.ObjMeta) error {
  syncMap.Store(meta.Path, v.Interface())
  return nil
 })
}

// TODO:

• fix tests
• build
• doc options
• doc func
• get val fn example
• viper example