example_static_test.go

// ssz: Go Simple Serialize (SSZ) codec library
// Copyright 2024 ssz Authors
// SPDX-License-Identifier: BSD-3-Clause

package ssz_test

import (
	"bytes"
	"fmt"

	"github.com/karalabe/ssz"
)

type Address [20]byte

type Withdrawal struct {
	Index     uint64  `ssz-size:"8"`
	Validator uint64  `ssz-size:"8"`
	Address   Address `ssz-size:"20"`
	Amount    uint64  `ssz-size:"8"`
}

func (w *Withdrawal) SizeSSZ(siz *ssz.Sizer) uint32 { return 44 }

func (w *Withdrawal) DefineSSZ(codec *ssz.Codec) {
	ssz.DefineUint64(codec, &w.Index)        // Field (0) - Index          -  8 bytes
	ssz.DefineUint64(codec, &w.Validator)    // Field (1) - ValidatorIndex -  8 bytes
	ssz.DefineStaticBytes(codec, &w.Address) // Field (2) - Address        - 20 bytes
	ssz.DefineUint64(codec, &w.Amount)       // Field (3) - Amount         -  8 bytes
}

func ExampleEncodeStaticObject() {
	out := new(bytes.Buffer)
	if err := ssz.EncodeToStream(out, new(Withdrawal)); err != nil {
		panic(err)
	}
	hash := ssz.HashSequential(new(Withdrawal))

	fmt.Printf("ssz: %#x\nhash: %#x\n", out, hash)
	// Output:
	// ssz: 0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
	// hash: 0xdb56114e00fdd4c1f85c892bf35ac9a89289aaecb1ebd0a96cde606a748b5d71
}