gwei-alert-bot/src/blockchain.ts

import 'dotenv/config.js';
import { GasPrices } from '../types/gasPrices'
import Web3 from 'web3';

const rpcUrl = process.env.RPC_URL || 'ws://localhost:8545';

// Create a new web3 instance
const web3 = new Web3(new Web3.providers.WebsocketProvider(rpcUrl, {
  reconnect: {
    auto: true,
    delay: 5000,
    maxAttempts: 5,
    onTimeout: false
  }
}));

// Get the current gas price in gwei
async function getGasPrice() {
  const gasPrice = await web3.eth.getGasPrice();
  return Number(gasPrice);
}

const getGasPricesInGwei = async (): Promise<GasPrices> => {
  const gweiFromWei = (priceInWei: number): number =>
    Number(web3.utils.fromWei(`${Math.round(priceInWei)}`, 'gwei'));

    try {
      const gasPrice = await getGasPrice()
      const fastPrice = gasPrice * 1.2;
      const slowPrice = gasPrice * 0.8;

      const gasPrices = {
        fast: gweiFromWei(fastPrice),
        average: gweiFromWei(gasPrice),
        slow: gweiFromWei(slowPrice),
      };

      return Promise.resolve(gasPrices);
      // await redisClient.set('gas-prices', JSON.stringify(gasPrices));
    } catch (error) {
      console.log(error);
      return Promise.reject(error);
    }
};

// Export the getCurrentGasPrice function
export { getGasPricesInGwei };