evm/bsc/wbnb.go

package bsc

import (
	"context"

	"git.lehouerou.net/laurent/evm"
	"git.lehouerou.net/laurent/evm/bsc/contracts"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/pkg/errors"
	"github.com/shopspring/decimal"
)

type WBNB struct {
	evm.Token
	client   evm.Client
	contract *contracts.WBnb
}

func NewWBNB(client evm.Client) (*WBNB, error) {
	address, err := client.TokenService().TokenAddressBySymbol("WBNB")
	if err != nil {
		return nil, errors.Wrap(err, "getting wbnb address")
	}
	t, err := evm.NewToken(client, address)
	if err != nil {
		return nil, errors.Wrap(err, "init token contract")
	}
	c, err := contracts.NewWBnb(address, client)
	if err != nil {
		return nil, errors.Wrap(err, "init wbnb contract")
	}

	return &WBNB{
		Token:    t,
		client:   client,
		contract: c,
	}, nil
}

func (w *WBNB) UnwrapWBNB(ctx context.Context, amount decimal.Decimal, opts ...evm.ExecutionOption) (evm.Transaction, error) {
	return w.client.Execute(ctx, func(ctx context.Context, opts *evm.TransactOpts) (*types.Transaction, error) {
		return w.contract.Withdraw(opts.TransactOpts, w.ValueToBigInt(amount))
	}, opts...)
}