web3

Go-Web3

JsonRPC

package main

import (
	"fmt"
	
	web3 "github.com/0xhelloweb3/go-web3"
	"github.com/0xhelloweb3/go-web3/jsonrpc"
)

func main() {
	client, err := jsonrpc.NewClient("https://mainnet.infura.io")
	if err != nil {
		panic(err)
	}

	number, err := client.Eth().BlockNumber()
	if err != nil {
		panic(err)
	}

	header, err := client.Eth().GetBlockByNumber(web3.BlockNumber(number), true)
	if err != nil {
		panic(err)
	}

	fmt.Println(header)
}

erc20 代币转账

测试： rinkey 测试网

• UNI 合约地址： 0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984T
• WETH 合约地址: 0xc778417E063141139Fce010982780140Aa0cD5Ab

目标：在rinkey测试网完成erc20代币转账

import (
	"encoding/hex"
	"fmt"
	"io/ioutil"
	"os"

	web3 "github.com/0xhelloweb3/go-web3"
	"github.com/0xhelloweb3/go-web3/abi"
	"github.com/0xhelloweb3/go-web3/contract"
	"github.com/0xhelloweb3/go-web3/jsonrpc"
	"github.com/0xhelloweb3/go-web3/wallet"
)

var (
	privateKeyHex = ""
	//rinkey 测试网合约地址，bsc等其他evm同理
	RpcUrl                       = "https://rinkeby.infura.io/v3/9aa3d95b3bc440fa88ea12eaa4456161"
	chainID                      = uint64(4)
	UniSwapRouterContractAddress = "0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D"
	RinKeyWETH                   = "0xc778417E063141139Fce010982780140Aa0cD5Ab"
	RinKeyUni                    = "0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984"
)

func main() {
	// 从私钥初始化钱包
	hextseed, _ := hex.DecodeString(privateKeyHex)
	walletkey, _ := wallet.NewWalletFromPrivKey(hextseed)

	// 初始化jsonRpc
	web3Client, err := jsonrpc.NewClient(RpcUrl)
	if err != nil {
		fmt.Printf("Error creating web3 client: %v\n", err)
		os.Exit(1)
	}
	// 获取eth余额
	found, _ := web3Client.Eth().GetBalance(walletkey.Address(), web3.Latest)

	fmt.Printf("eth 代币余额: %v", found)
	// uni 代币合约地址
	web3ContractAddress := web3.HexToAddress(RinKeyUni)
	//erc20合约abi文件所在目录，也可以加载任意合约abi
	// [{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_upgradedAddress","type":"address"}],"name":"deprecate","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"name":"approve","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"deprecated","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_evilUser","type":"address"}],"name":"addBlackList","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"upgradedAddress","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"balances","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"maximumFee","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"_totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"unpause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_maker","type":"address"}],"name":"getBlackListStatus","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"},{"name":"","type":"address"}],"name":"allowed","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"paused","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"who","type":"address"}],"name":"balanceOf","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"pause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getOwner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transfer","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newBasisPoints","type":"uint256"},{"name":"newMaxFee","type":"uint256"}],"name":"setParams","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"amount","type":"uint256"}],"name":"issue","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"amount","type":"uint256"}],"name":"redeem","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"remaining","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"basisPointsRate","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"isBlackListed","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_clearedUser","type":"address"}],"name":"removeBlackList","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"MAX_UINT","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_blackListedUser","type":"address"}],"name":"destroyBlackFunds","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[{"name":"_initialSupply","type":"uint256"},{"name":"_name","type":"string"},{"name":"_symbol","type":"string"},{"name":"_decimals","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"name":"amount","type":"uint256"}],"name":"Issue","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"amount","type":"uint256"}],"name":"Redeem","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"newAddress","type":"address"}],"name":"Deprecate","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"feeBasisPoints","type":"uint256"},{"indexed":false,"name":"maxFee","type":"uint256"}],"name":"Params","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"_blackListedUser","type":"address"},{"indexed":false,"name":"_balance","type":"uint256"}],"name":"DestroyedBlackFunds","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"_user","type":"address"}],"name":"AddedBlackList","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"name":"_user","type":"address"}],"name":"RemovedBlackList","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"owner","type":"address"},{"indexed":true,"name":"spender","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"from","type":"address"},{"indexed":true,"name":"to","type":"address"},{"indexed":false,"name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[],"name":"Pause","type":"event"},{"anonymous":false,"inputs":[],"name":"Unpause","type":"event"}]

	abiBytes, err := ioutil.ReadFile("abi/erc20ABI.json")
	if err != nil {
		fmt.Println("Error when reading ERC20 ABI from file.")
	}
	// 创建web3 abi 实例
	abi, err := abi.NewABI(string(abiBytes))
	if err != nil {
		fmt.Println("Error when creating ERC20ABI", err)
		return
	}
	contractInstance := contract.NewContract(web3ContractAddress, abi, web3Client)
	contractInstance.SetFrom(web3.HexToAddress(walletkey.Address().String()))
	TransferTxn := contractInstance.Txn("transfer",
		web3.HexToAddress("transfer地址"), 100000)

	// 这里可以重新定义gasprice,limit,nonce等
	web3Txn, _ := TransferTxn.BuildTx()

        // 也可以：chainID,_ := web3Client.Eth().ChainID() 来根据rpc获取chainId
	signer := wallet.NewEIP155Signer(chainID)
	signWeb3Txn, err := signer.SignTx(web3Txn, walletkey)
	if err != nil {
		fmt.Printf("Error when signing transaction: %v\n", err)
	}
	data, _ := signWeb3Txn.MarshalRLPTo(nil)

	// send the transaction
	hash, err := web3Client.Eth().SendRawTransaction(data)
	if err != nil {
		fmt.Printf("Error when sending transaction: %v\n", err)
	}
	fmt.Printf("hash:%v", hash)
}