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token_stub.go
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token_stub.go
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package swan_token
import (
"context"
"crypto/ecdsa"
"fmt"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethclient"
"github.com/swanchain/go-computing-provider/conf"
"math/big"
"strings"
)
type Stub struct {
client *ethclient.Client
token *Main
privateK string
publicK string
}
type Option func(*Stub)
func WithPrivateKey(pk string) Option {
return func(obj *Stub) {
obj.privateK = pk
}
}
func WithPublicKey(pk string) Option {
return func(obj *Stub) {
obj.publicK = pk
}
}
func NewTokenStub(client *ethclient.Client, options ...Option) (*Stub, error) {
stub := &Stub{}
for _, option := range options {
option(stub)
}
tokenAddress := common.HexToAddress(conf.GetConfig().CONTRACT.SwanToken)
tokenClient, err := NewMain(tokenAddress, client)
if err != nil {
return nil, fmt.Errorf("create collateral contract client, error: %+v", err)
}
stub.token = tokenClient
stub.client = client
return stub, nil
}
func (s *Stub) BalanceOf() (string, error) {
if len(strings.TrimSpace(s.publicK)) == 0 {
return "", fmt.Errorf("wallet address must be not empty")
}
publicAddress := common.HexToAddress(s.publicK)
balance, err := s.token.BalanceOf(&bind.CallOpts{}, publicAddress)
if err != nil {
return "", fmt.Errorf("address: %s, read token contract balance, error: %+v", publicAddress, err)
}
var ethValue string
if balance.String() == "0" {
ethValue = "0.0"
} else {
fbalance := new(big.Float)
fbalance.SetString(balance.String())
etherQuotient := new(big.Float).Quo(fbalance, new(big.Float).SetInt(big.NewInt(1e18)))
ethValue = etherQuotient.Text('f', 5)
}
return ethValue, nil
}
func (s *Stub) Approve(amount *big.Int) (string, error) {
publicAddress, err := s.privateKeyToPublicKey()
if err != nil {
return "", err
}
txOptions, err := s.createTransactOpts()
if err != nil {
return "", fmt.Errorf("address: %s, collateral client create transaction, error: %+v", publicAddress, err)
}
collateralAddress := common.HexToAddress(conf.GetConfig().CONTRACT.Collateral)
transaction, err := s.token.Approve(txOptions, collateralAddress, amount)
if err != nil {
return "", fmt.Errorf("address: %s, token contract approve, error: %+v", publicAddress, err)
}
return transaction.Hash().String(), nil
}
func (s *Stub) Transfer(to string, amount *big.Int) (string, error) {
publicAddress, err := s.privateKeyToPublicKey()
if err != nil {
return "", err
}
txOptions, err := s.createTransactOpts()
if err != nil {
return "", fmt.Errorf("address: %s, collateral client create transaction, error: %+v", publicAddress, err)
}
toAddress := common.HexToAddress(to)
transaction, err := s.token.Transfer(txOptions, toAddress, amount)
if err != nil {
return "", fmt.Errorf("address: %s, token contract transfer, error: %+v", publicAddress, err)
}
return transaction.Hash().String(), nil
}
func (s *Stub) privateKeyToPublicKey() (common.Address, error) {
if len(strings.TrimSpace(s.privateK)) == 0 {
return common.Address{}, fmt.Errorf("wallet address private key must be not empty")
}
privateKey, err := crypto.HexToECDSA(s.privateK)
if err != nil {
return common.Address{}, fmt.Errorf("parses private key error: %+v", err)
}
publicKey := privateKey.Public()
publicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey)
if !ok {
return common.Address{}, fmt.Errorf("cannot assert type: publicKey is not of type *ecdsa.PublicKey")
}
return crypto.PubkeyToAddress(*publicKeyECDSA), nil
}
func (s *Stub) createTransactOpts() (*bind.TransactOpts, error) {
publicAddress, err := s.privateKeyToPublicKey()
if err != nil {
return nil, err
}
nonce, err := s.client.PendingNonceAt(context.Background(), publicAddress)
if err != nil {
return nil, fmt.Errorf("address: %s, collateral client get nonce error: %+v", publicAddress, err)
}
suggestGasPrice, err := s.client.SuggestGasPrice(context.Background())
if err != nil {
return nil, fmt.Errorf("address: %s, collateral client retrieves the currently suggested gas price, error: %+v", publicAddress, err)
}
chainId, err := s.client.ChainID(context.Background())
if err != nil {
return nil, fmt.Errorf("address: %s, collateral client get networkId, error: %+v", publicAddress, err)
}
privateKey, err := crypto.HexToECDSA(s.privateK)
if err != nil {
return nil, fmt.Errorf("parses private key error: %+v", err)
}
txOptions, err := bind.NewKeyedTransactorWithChainID(privateKey, chainId)
if err != nil {
return nil, fmt.Errorf("address: %s, collateral client create transaction, error: %+v", publicAddress, err)
}
txOptions.Nonce = big.NewInt(int64(nonce))
suggestGasPrice = suggestGasPrice.Mul(suggestGasPrice, big.NewInt(3))
suggestGasPrice = suggestGasPrice.Div(suggestGasPrice, big.NewInt(2))
txOptions.GasFeeCap = suggestGasPrice
txOptions.Context = context.Background()
return txOptions, nil
}