Golang实现以太坊转账

阅读更多

	client, err := ethclient.Dial("infura url")
	if err != nil {
		log.Fatal(err)
	}
	log.Println(client)
	privateKey, err := crypto.HexToECDSA("private key")
	if err != nil {
		log.Fatal(err)
	}
	log.Println("privatekey", privateKey)
	//
	publicKey := privateKey.Public()
	publicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey)
	if !ok {
		log.Fatal("error casting public key to ECDSA")
	}
	log.Println("publicKeyECDSA  ", publicKeyECDSA)
	fromAddress := crypto.PubkeyToAddress(*publicKeyECDSA)
	nonce, err := client.PendingNonceAt(context.Background(), fromAddress)
	if err != nil {
		log.Fatal(err)
	}
	log.Println("fromaddress ", fromAddress)
	log.Println("nonce", nonce)
	//
	value := big.NewInt(0) // in wei (0 eth)
	gasPrice, err := client.SuggestGasPrice(context.Background())
	if err != nil {
		log.Fatal(err)
	}
	//
	toAddress := common.HexToAddress("to address")
	tokenAddress := common.HexToAddress("contract address")
	//
	transferFnSignature := []byte("transfer(address,uint256)")
	hash := sha3.NewKeccak256()
	hash.Write(transferFnSignature)
	methodID := hash.Sum(nil)[:4]
	fmt.Printf("Method ID: %s\n", hexutil.Encode(methodID))
	//
	paddedAddress := common.LeftPadBytes(toAddress.Bytes(), 32)
	fmt.Printf("To address: %s\n", hexutil.Encode(paddedAddress))
	//
	amount := new(big.Int)
	amount.SetString("10000000", 10) // 1000 tokens
	paddedAmount := common.LeftPadBytes(amount.Bytes(), 32)
	fmt.Printf("Token amount: %s", hexutil.Encode(paddedAmount))
	//
	var data []byte
	data = append(data, methodID...)
	data = append(data, paddedAddress...)
	data = append(data, paddedAmount...)
	//
	gasLimit, err := client.EstimateGas(context.Background(), ethereum.CallMsg{
		To:   &toAddress,
		Data: data,
	})
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("Gas limit: %d", gasLimit)
	tx := types.NewTransaction(nonce, tokenAddress, value, gasLimit*2, gasPrice, data)
	signedTx, err := types.SignTx(tx, types.HomesteadSigner{}, privateKey)
	if err != nil {
		log.Fatal(err)
	}
	err = client.SendTransaction(context.Background(), signedTx)
	if err != nil {
		log.Fatal(err)
	}
	fmt.Printf("Tokens sent at TX: %s", signedTx.Hash().Hex())
}

 

• 使用infura作为以太坊节点
• gaslimit太小容易out of gas
• etherscan上查看transaction