pancake.js

pancake.js

const ethers = require(`ethers`)
const { ChainId, Token, TokenAmount, Fetcher, Pair, Route, Trade, TradeType, Percent } =
require(`@pancakeswap-libs/sdk`);
const Web3 = require(`web3`);
const { JsonRpcProvider } = require("@ethersproject/providers");

require(“dotenv”).config()

const provider = new JsonRpcProvider(`https://bsc-dataseed1.binance.org/`);
const web3 = new Web3(`wss://apis.ankr.com/wss/c40792ffe3514537be9fb4109b32d257/946dd909d324e5a6caa2b72ba75c5799/binance/full/main`);

const { address: admin } = web3.eth.accounts.wallet.add(process.env.PRIVATE_KEY)

console.log(Modulos cargados)

const PANCAKE_ROUTER_V2 = `0x10ed43c718714eb63d5aa57b78b54704e256024e`;
const PANCAKE_ROUTER_V1 = `0x05fF2B0DB69458A0750badebc4f9e13aDd608C7F`;

//web3.toChecksumAddress(‘INSERT ADDRESS HERE’) Need this?

var SAFEMOON = `0x8076C74C5e3F5852037F31Ff0093Eeb8c8ADd8D3`;
var WBNB = `0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c`;
var BUSD = `0xe9e7CEA3DedcA5984780Bafc599bD69ADd087D56`;

const addresses = {
    INPUT_TOKEN: WBNB,
    OUTPUT_TOKEN: SAFEMOON,
    PANCAKE_ROUTER: PANCAKE_ROUTER_V2
}

// 1/1000 = 0.001
const ONE_ETH_IN_WEI = web3.utils.toBN(web3.utils.toWei(`1`)) //BN->(BIG NUMBER) || toWei → Converts any ether value value into wei.
const tradeAmount = ONE_ETH_IN_WEI.div(web3.utils.toBN(`1000`)) //tradeAmount = ONE_ETH_IN_WEI/1000

console.log(tradeAmount + tradeAmount);

const init = async () => {

    const [INPUT_TOKEN, OUTPUT_TOKEN] = await Promise.all(
        [addresses.INPUT_TOKEN, addresses.OUTPUT_TOKEN].map(tokenAddress => (
            new Token(
                ChainId.MAINNET,
                tokenAddress,
                18
            )
        )));

    console.log(` <<<<<------- pair-------->>>>>`)
    const pair = await Fetcher.fetchPairData(INPUT_TOKEN, OUTPUT_TOKEN, provider)
    //console.log(JSON.stringify(pair));
    console.log(` <<<<<------- route-------->>>>>`)
    const route = await new Route([pair], INPUT_TOKEN)
    //console.log(JSON.stringify(route));
    console.log(` <<<<<------- Trade-------->>>>>`)
    const trade = await new Trade(route, new TokenAmount(INPUT_TOKEN, tradeAmount), TradeType.EXACT_INPUT)
    //console.log(JSON.stringify(trade));


    //https://uniswap.org/docs/v2/javascript-SDK/trading/
    const slippageTolerance = new Percent('16', '100') // 
    console.log("slippageTolerance: " + JSON.stringify(slippageTolerance));


    // create transaction parameters
    const amountOutMin = trade.minimumAmountOut(slippageTolerance).raw
    const path = [INPUT_TOKEN.address, OUTPUT_TOKEN.address]
    const to = admin
    const deadline = Math.floor(Date.now() / 1000) + 60 * 20

    // Create signer
    const wallet = new ethers.Wallet(
        Buffer.from(
            process.env.PRIVATE_KEY,
            "hex"
        )
    )
    const signer = wallet.connect(provider)

    // Create Pancakeswap ethers Contract
    const pancakeswap = new ethers.Contract(
        addresses.PANCAKE_ROUTER,
        ['function swapExactTokensForTokens(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline) external returns (uint[] memory amounts)'],
        signer
    )

    //Allow input token
    if (true) {

        console.log(`Allow Pancakeswap <<<<<------- START-------->>>>>`)
        let abi = ["function approve(address _spender, uint256 _value) public returns (bool success)"]
        let contract = new ethers.Contract(INPUT_TOKEN.address, abi, signer)
        let aproveResponse = await contract.approve(addresses.PANCAKE_ROUTER, ethers.utils.parseUnits('1000.0', 18), { gasLimit: 100000, gasPrice: 5e9 })
        console.log(JSON.stringify(aproveResponse))
        console.log(`Allow Pancakeswap <<<<<------- END-------->>>>>`)

    }

    if (true) {

        console.log(`Inject params for swap transaction`)
        var amountInParam = ethers.utils.parseUnits('0.001', 18);
        var amountOutMinParam = ethers.utils.parseUnits(web3.utils.fromWei(amountOutMin.toString()), 18);

        console.log("amountInParam: " + amountInParam);
        console.log("amountOutMinParam: " + amountOutMinParam);
        console.log("amountOutMin: " + amountOutMin);




        const tx = await pancakeswap.swapExactTokensForTokens(
            amountInParam,
            amountOutMinParam,
            path,
            to,
            deadline, { gasLimit: ethers.utils.hexlify(300000), gasPrice: ethers.utils.parseUnits("9", "gwei") }
        )

        console.log(`Tx-hash: ${tx.hash}`)
        const receipt = await tx.wait();
        console.log(`Tx was mined in block: ${receipt.blockNumber}`)
    }
}

init()