golang web3 开发教程（web3tool）_web3 golang

web3tool 是一组 Go 语言库，它们用于连接和操作 Ethereum 区块链。它们提供了一组简单易用的 API，可以让您轻松地与以太坊区块链进行交互。

首先新建一个文件夹，复制下面代码到test.go文件，然后执行

go mod init testweb3tool

再执行：

go mod tidy

test.go 文件如下：

package main
 
import (
	"encoding/hex"
	"fmt"
	"github.com/yellomoon/web3tool"
	"github.com/yellomoon/web3tool/abi"
	"github.com/yellomoon/web3tool/contract"
	"github.com/yellomoon/web3tool/jsonrpc"
	"github.com/yellomoon/web3tool/wallet"
	"math"
	"math/big"
	"sync"
)
 
var RpcClient *jsonrpc.Client
var mut sync.Mutex
var erc20AbiStr = `[{"constant":false,"inputs":[{"name":"_evilUser","type":"address"}],"name":"addBlackList","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":false,"inputs":[{"name":"_upgradedAddress","type":"address"}],"name":"deprecate","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_blackListedUser","type":"address"}],"name":"destroyBlackFunds","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":"pause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"amount","type":"uint256"}],"name":"redeem","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_clearedUser","type":"address"}],"name":"removeBlackList","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":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transfer","outputs":[],"payable":false,"stateMutability":"nonpayable","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":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"unpause","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"},{"constant":true,"inputs":[],"name":"_totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","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":"","type":"address"},{"name":"","type":"address"}],"name":"allowed","outputs":[{"name":"","type":"uint256"}],"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":true,"inputs":[{"name":"","type":"address"}],"name":"balances","outputs":[{"name":"","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":"decimals","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"deprecated","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","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":"getOwner","outputs":[{"name":"","type":"address"}],"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":true,"inputs":[],"name":"MAX_UINT","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":"name","outputs":[{"name":"","type":"string"}],"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":"paused","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"upgradedAddress","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"}]`
var uniswapRouter3Abi = `[{"inputs":[{"internalType":"address","name":"_factoryV2","type":"address"},{"internalType":"address","name":"factoryV3","type":"address"},{"internalType":"address","name":"_positionManager","type":"address"},{"internalType":"address","name":"_WETH9","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"WETH9","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"approveMax","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"approveMaxMinusOne","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"approveZeroThenMax","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"}],"name":"approveZeroThenMaxMinusOne","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes","name":"data","type":"bytes"}],"name":"callPositionManager","outputs":[{"internalType":"bytes","name":"result","type":"bytes"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes[]","name":"paths","type":"bytes[]"},{"internalType":"uint128[]","name":"amounts","type":"uint128[]"},{"internalType":"uint24","name":"maximumTickDivergence","type":"uint24"},{"internalType":"uint32","name":"secondsAgo","type":"uint32"}],"name":"checkOracleSlippage","outputs":[],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes","name":"path","type":"bytes"},{"internalType":"uint24","name":"maximumTickDivergence","type":"uint24"},{"internalType":"uint32","name":"secondsAgo","type":"uint32"}],"name":"checkOracleSlippage","outputs":[],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"bytes","name":"path","type":"bytes"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMinimum","type":"uint256"}],"internalType":"struct IV3SwapRouter.ExactInputParams","name":"params","type":"tuple"}],"name":"exactInput","outputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"tokenIn","type":"address"},{"internalType":"address","name":"tokenOut","type":"address"},{"internalType":"uint24","name":"fee","type":"uint24"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMinimum","type":"uint256"},{"internalType":"uint160","name":"sqrtPriceLimitX96","type":"uint160"}],"internalType":"struct IV3SwapRouter.ExactInputSingleParams","name":"params","type":"tuple"}],"name":"exactInputSingle","outputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"bytes","name":"path","type":"bytes"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"amountInMaximum","type":"uint256"}],"internalType":"struct IV3SwapRouter.ExactOutputParams","name":"params","type":"tuple"}],"name":"exactOutput","outputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"tokenIn","type":"address"},{"internalType":"address","name":"tokenOut","type":"address"},{"internalType":"uint24","name":"fee","type":"uint24"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"amountInMaximum","type":"uint256"},{"internalType":"uint160","name":"sqrtPriceLimitX96","type":"uint160"}],"internalType":"struct IV3SwapRouter.ExactOutputSingleParams","name":"params","type":"tuple"}],"name":"exactOutputSingle","outputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"factory","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"factoryV2","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"getApprovalType","outputs":[{"internalType":"enum IApproveAndCall.ApprovalType","name":"","type":"uint8"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"token0","type":"address"},{"internalType":"address","name":"token1","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"},{"internalType":"uint256","name":"amount0Min","type":"uint256"},{"internalType":"uint256","name":"amount1Min","type":"uint256"}],"internalType":"struct IApproveAndCall.IncreaseLiquidityParams","name":"params","type":"tuple"}],"name":"increaseLiquidity","outputs":[{"internalType":"bytes","name":"result","type":"bytes"}],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"address","name":"token0","type":"address"},{"internalType":"address","name":"token1","type":"address"},{"internalType":"uint24","name":"fee","type":"uint24"},{"internalType":"int24","name":"tickLower","type":"int24"},{"internalType":"int24","name":"tickUpper","type":"int24"},{"internalType":"uint256","name":"amount0Min","type":"uint256"},{"internalType":"uint256","name":"amount1Min","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"}],"internalType":"struct IApproveAndCall.MintParams","name":"params","type":"tuple"}],"name":"mint","outputs":[{"internalType":"bytes","name":"result","type":"bytes"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"previousBlockhash","type":"bytes32"},{"internalType":"bytes[]","name":"data","type":"bytes[]"}],"name":"multicall","outputs":[{"internalType":"bytes[]","name":"","type":"bytes[]"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"bytes[]","name":"data","type":"bytes[]"}],"name":"multicall","outputs":[{"internalType":"bytes[]","name":"","type":"bytes[]"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes[]","name":"data","type":"bytes[]"}],"name":"multicall","outputs":[{"internalType":"bytes[]","name":"results","type":"bytes[]"}],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"positionManager","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"pull","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"refundETH","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"selfPermit","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"uint256","name":"expiry","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"selfPermitAllowed","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"uint256","name":"expiry","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"selfPermitAllowedIfNecessary","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"selfPermitIfNecessary","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"}],"name":"swapExactTokensForTokens","outputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"uint256","name":"amountInMax","type":"uint256"},{"internalType":"address[]","name":"path","type":"address[]"},{"internalType":"address","name":"to","type":"address"}],"name":"swapTokensForExactTokens","outputs":[{"internalType":"uint256","name":"amountIn","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amountMinimum","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"}],"name":"sweepToken","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amountMinimum","type":"uint256"}],"name":"sweepToken","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amountMinimum","type":"uint256"},{"internalType":"uint256","name":"feeBips","type":"uint256"},{"internalType":"address","name":"feeRecipient","type":"address"}],"name":"sweepTokenWithFee","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"token","type":"address"},{"internalType":"uint256","name":"amountMinimum","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"feeBips","type":"uint256"},{"internalType":"address","name":"feeRecipient","type":"address"}],"name":"sweepTokenWithFee","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"int256","name":"amount0Delta","type":"int256"},{"internalType":"int256","name":"amount1Delta","type":"int256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"uniswapV3SwapCallback","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountMinimum","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"}],"name":"unwrapWETH9","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountMinimum","type":"uint256"}],"name":"unwrapWETH9","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountMinimum","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"feeBips","type":"uint256"},{"internalType":"address","name":"feeRecipient","type":"address"}],"name":"unwrapWETH9WithFee","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amountMinimum","type":"uint256"},{"internalType":"uint256","name":"feeBips","type":"uint256"},{"internalType":"address","name":"feeRecipient","type":"address"}],"name":"unwrapWETH9WithFee","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"value","type":"uint256"}],"name":"wrapETH","outputs":[],"stateMutability":"payable","type":"function"},{"stateMutability":"payable","type":"receive"}]`
var privateKey = "6631a605adf5a9cbcb646a79abb32dd461c9b406b1ff6e9e12a6248272fcc06a"
var myAddress = "0xc0a8C0eA40BD40E8de0aef98Cc1473D990077bE5"
var uniswapRouter3Address = "0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45"
var usdtAddress = "0xdAC17F958D2ee523a2206206994597C13D831ec7"
var wbtcAddress = "0x2260FAC5E5542a773Aa44fBCfeDf7C193bc2C599"
var rpcUrl = "https://eth-mainnet.public.blastapi.io" // RPC URL  如果地址不能使用了 请去 https://infura.io 注册账号获取免费的
 
func getClient() *jsonrpc.Client {
	mut.Lock()
	defer mut.Unlock()
	var err error
	if RpcClient == nil {
		RpcClient, err = jsonrpc.NewClient(rpcUrl)
		if err != nil {
			panic(err)
		}
	}
	return RpcClient
}
func getErc20Abi() *abi.ABI {
	erc20Abi, _ := abi.NewABI(erc20AbiStr)
	return erc20Abi
}
 
func getUniswapAbi() *abi.ABI {
	uniswapAbi, _ := abi.NewABI(uniswapRouter3Abi)
	return uniswapAbi
}
 
func mycontract(contractAddress string, abi *abi.ABI) *contract.Contract {
	privateByte, _ := hex.DecodeString(privateKey)
	key, _ := wallet.NewWalletFromPrivKey(privateByte)
	opts := []contract.ContractOption{
		contract.WithJsonRPC(getClient().Eth()),
		contract.WithSender(key),
	}
	c := contract.NewContract(web3tool.HexToAddress(contractAddress), abi, opts...)
	return c
}
 
func mycontractCall(txn contract.Txn) string {
	err := txn.Do()
	receipt, err := txn.Wait()
	if err != nil {
		panic(err)
	}
	fmt.Printf("Transaction mined at: %s", receipt.TransactionHash)
	return receipt.TransactionHash.String()
}
 
/*
   获取指定账户的eth余额
   address: 指定账户地址
   :return:账户余额
*/
func getEthBalance(address string) *big.Int {
	client := getClient()
	number, err := client.Eth().BlockNumber()
	if err != nil {
		panic(err)
	}
	balance, e := client.Eth().GetBalance(web3tool.HexToAddress(address), web3tool.BlockNumber(number))
	if e != nil {
		panic(e)
	}
	return balance
}
 
/*
   获取指定账户的erc20代币余额
   erc20Address：erc20合约地址
   ownerAddress： 指定账户地址
   :return:账户erc20代币余额
*/
func getErc20Balance(erc20Address, ownerAddress string) *big.Int {
	client := getClient()
	number, err := client.Eth().BlockNumber()
	if err != nil {
		panic(err)
	}
	contract := contract.NewContract(web3tool.HexToAddress(erc20Address), getErc20Abi(), contract.WithJsonRPC(client.Eth()))
	result, _ := contract.Call("balanceOf", web3tool.BlockNumber(number), web3tool.HexToAddress(ownerAddress))
	return (result["0"]).(*big.Int)
}
 
/*
   获取ERC20代币的授权量
   erc20Address：代币合约地址
   ownerAddress：授权主体
   contractAddress： 被授权方地址
*/
func getErc20Allowance(erc20Address, ownerAddress, contractAddress string) *big.Int {
	client := getClient()
	contract := contract.NewContract(web3tool.HexToAddress(erc20Address), getErc20Abi(), contract.WithJsonRPC(client.Eth()))
	result, err := contract.Call("allowance", web3tool.Latest, web3tool.HexToAddress(ownerAddress), web3tool.HexToAddress(contractAddress))
	if err != nil {
		return big.NewInt(0)
	}
	return (result["remaining"]).(*big.Int)
}
 
/*
   发送指定数量的eth给指定地址
   toAddress：接收方地址
   amount：发送eth数量
*/
func transferEth(toAddress string, amount float64) string {
	amountInt := int64(amount * math.Pow10(18))
	to := web3tool.HexToAddress(toAddress)
	number, err := getClient().Eth().BlockNumber()
	if err != nil {
		panic(err)
	}
	nonce, _ := getClient().Eth().GetNonce(web3tool.HexToAddress(myAddress), web3tool.BlockNumber(number))
	txn := &web3tool.Transaction{
		To:       &to,
		Value:    big.NewInt(amountInt),
		GasPrice: 10,
		Gas:      21000,
		Nonce:    nonce,
	}
	privateByte, _ := hex.DecodeString(privateKey)
	key, _ := wallet.NewWalletFromPrivKey(privateByte)
	signer := wallet.NewEIP155Signer(1) //主网 chainID是1
	txn, _ = signer.SignTx(txn, key)
	data, _ := txn.MarshalRLPTo(nil)
	hash, err := getClient().Eth().SendRawTransaction(data)
	if err != nil {
		fmt.Printf("%v", err)
	}
	return hash.String()
}
 
/*
   发送erc20代币给指定地址指定数量
   erc20Address：erc20代币合约地址
   toAddress：接收方地址
   amount：发送erc20代币数量
*/
func transferErc20(erc20Address, toAddress string, amount int64) string {
	c := mycontract(erc20Address, getErc20Abi())
	txn, e := c.Txn("transfer", web3tool.HexToAddress(toAddress), amount, web3tool.Latest)
	if e != nil {
		fmt.Printf("%v", e)
	}
	hash := mycontractCall(txn)
	return hash
}
 
/*
   授权给指定地址指定数量的消费额度
   erc20Address： erc20代币地址
   ownerAddress：授权方地址
   contractAddress：指定的其他消费代币的合约地址
   amount：授权数量
*/
func approve(erc20Address, ownerAddress, contractAddress string, amount uint64) string {
	c := mycontract(erc20Address, getErc20Abi())
	txn, e := c.Txn("approve", web3tool.HexToAddress(contractAddress), amount, web3tool.Latest)
	if e != nil {
		fmt.Printf("%v", e)
	}
	hash := mycontractCall(txn)
	return hash
}
 
/*
   发起dex交易，通过uniswapV3 dex进行交易
   :param inputAddress: 输入的erc20 代币地址
   :param outAddress:  输出的erc20 代币地址
   :param inputAmount: 输入数量
*/
func UniswapV3Swap(inputAddress, outAddress string, inputAmount int64) string {
	allowance := getErc20Allowance(inputAddress, myAddress, uniswapRouter3Address)
	if allowance.Cmp(big.NewInt(inputAmount)) == -1 {
		h := approve(inputAddress, myAddress, uniswapRouter3Address, uint64(0xfffffffffffffff))
		fmt.Printf("hash: %s", h)
	}
	c := mycontract(uniswapRouter3Address, getUniswapAbi())
	txn, e := c.Txn("exactInputSingle", map[string]interface{}{
		"tokenIn":           web3tool.HexToAddress(inputAddress),
		"tokenOut":          web3tool.HexToAddress(outAddress),
		"fee":               3000,
		"recipient":         web3tool.HexToAddress(myAddress),
		"amountIn":          inputAmount,
		"amountOutMinimum":  0,
		"sqrtPriceLimitX96": 0,
	}, web3tool.Latest)
	if e != nil {
		fmt.Printf("%v", e)
	}
	hash := mycontractCall(txn)
	return hash
}
 
func main() {
	var hash string
	//获取账户以太坊余额
	balance := getEthBalance(myAddress)
	fmt.Printf("balance: %s", balance.String())
	//获取账户usdt余额
	erc20balance := getErc20Balance(usdtAddress, myAddress)
	fmt.Printf("erc20 balance: %s", erc20balance.String())
	// 发送1个以太坊给 0x50431c70f6B4B9ab5CA438Cb9a3f030C4Bad5707
	hash = transferEth("0x50431c70f6B4B9ab5CA438Cb9a3f030C4Bad5707", 1)
	fmt.Printf("%s", hash)
	//# 发送1usdt 给 0x50431c70f6B4B9ab5CA438Cb9a3f030C4Bad5707
	hash = transferErc20(usdtAddress, "0x50431c70f6B4B9ab5CA438Cb9a3f030C4Bad5707", 1)
	fmt.Printf("%s", hash)
	//# 给 uniswapRouter3Address 授权 100usdt的消费额度
	hash = approve(usdtAddress, myAddress, uniswapRouter3Address, 0)
	fmt.Printf("%s", hash)
	//myAddress uniswapRouter3Address 授权量多少usdt消费额度
	erc20allowance := getErc20Allowance(usdtAddress, myAddress, uniswapRouter3Address)
	fmt.Printf("erc20 allowance: %s", erc20allowance.String())
	//花 100 usdt 买入 WBTC
	hash = UniswapV3Swap(usdtAddress, wbtcAddress, 100)
	fmt.Errorf("%s", hash)
}

通过test.go的例子，就可以实现链上套利交易啦