ethertest/account.go at master · tokencard/ethertest · GitHub

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package ethertest

import (
	"context"
	"crypto/ecdsa"
	"errors"
	"math/big"

	"github.com/ethereum/go-ethereum/accounts/abi/bind"
	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/core/types"
	"github.com/ethereum/go-ethereum/crypto"
)

var ErrTransactionFailed = errors.New("Transaction Failed")

func NewAccount() *Account {
	k, err := crypto.GenerateKey()

	// will only happen if RNG fails big time
	if err != nil {
		panic(err)
	}

	return &Account{k}
}

func NewAccountFromPrivKey(pk *ecdsa.PrivateKey) *Account {
	return &Account{pk}
}

type Account struct {
	pk *ecdsa.PrivateKey
}

func (a *Account) Address() common.Address {
	return crypto.PubkeyToAddress(a.pk.PublicKey)
}

func (a *Account) PrivKey() *ecdsa.PrivateKey {
	return a.pk
}

func (a *Account) MustTransfer(be TestBackend, to common.Address, amount *big.Int) {
	err := a.Transfer(be, to, amount)
	if err != nil {
		panic(err)
	}
}

func (a *Account) SignTransaction(be TestBackend, tx *types.Transaction) (*types.Transaction, error) {
	return types.SignTx(tx, types.HomesteadSigner{}, a.pk)
}

func (a *Account) Transfer(be TestBackend, to common.Address, amount *big.Int) error {
	n, err := be.PendingNonceAt(context.Background(), a.Address())
	if err != nil {
		return err
	}

	gasPrice, err := be.SuggestGasPrice(context.Background())
	if err != nil {
		return err
	}

	tx := types.NewTransaction(n, to, amount, 41000, gasPrice, nil)

	signed, err := types.SignTx(tx, types.HomesteadSigner{}, a.pk)
	if err != nil {
		return err
	}

	err = be.SendTransaction(context.Background(), signed)
	if err != nil {
		return err
	}

	be.Commit()

	rcpt, err := be.TransactionReceipt(context.Background(), signed.Hash())
	if err != nil {
		return err
	}
	if rcpt.Status != types.ReceiptStatusSuccessful {
		return ErrTransactionFailed
	}
	return nil
}

type TransactionOptionModifier func(*bind.TransactOpts)

func WithGasLimit(gasLimit uint64) func(*bind.TransactOpts) {
	return func(to *bind.TransactOpts) {
		to.GasLimit = gasLimit
	}
}

func WithGasPrice(gasPrice *big.Int) func(*bind.TransactOpts) {
	return func(to *bind.TransactOpts) {
		to.GasPrice = gasPrice
	}
}

func WithValue(value *big.Int) func(*bind.TransactOpts) {
	return func(to *bind.TransactOpts) {
		to.Value = value
	}
}

func (a *Account) TransactOpts(modifiers ...TransactionOptionModifier) *bind.TransactOpts {
	to := bind.NewKeyedTransactor(a.pk)
	for _, m := range modifiers {
		m(to)
	}
	return to
}

func (a *Account) Balance(be TestBackend) *big.Int {
	b, err := be.BalanceAt(context.Background(), a.Address(), nil)
	if err != nil {
		panic(err)
	}
	return b
}