truffle-config.js

/**
 * Use this file to configure your truffle project. It's seeded with some
 * common settings for different networks and features like migrations,
 * compilation and testing. Uncomment the ones you need or modify
 * them to suit your project as necessary.
 *
 * More information about configuration can be found at:
 *
 * trufflesuite.com/docs/advanced/configuration
 *
 * To deploy via Infura you'll need a wallet provider (like @truffle/hdwallet-provider)
 * to sign your transactions before they're sent to a remote public node. Infura accounts
 * are available for free at: infura.io/register.
 *
 * You'll also need a mnemonic - the twelve word phrase the wallet uses to generate
 * public/private key pairs. If you're publishing your code to GitHub make sure you load this
 * phrase from a file you've .gitignored so it doesn't accidentally become public.
 *
 */

const HDWalletProvider = require('@truffle/hdwallet-provider');
require('dotenv').config();

const MAINNET_DEPLOYER_KEY = process.env.MAINNET_DEPLOYER_KEY;
const TESTNET_DEPLOYER_KEY = process.env.TESTNET_DEPLOYER_KEY;

/**`
* Pass in an array of RPC urls to grab a random one on each run.
* This function uses a closure so that the same rpc url is used on each run as 
* HDWallet provider calls it multiple times
* 
* @param {*} rpcUrlArray 
* @returns rpcUrl
*/
function randomRpcHandler() {
  let rpc = undefined;
  return function (rpcUrlArray) {
    if (!rpc) {
      // Using `| 0` here in place of Math.floor()
      rpc = rpcUrlArray[(Math.random() * rpcUrlArray.length) | 0];
      console.log(`truffle-config::Using rpc ${rpc}`)
    }
    return rpc;
  }
}

const BSC_RPC = randomRpcHandler();
const BSC_TESTNET_RPC = randomRpcHandler();

module.exports = {
  networks: {
    development: {
      host: "127.0.0.1",     // Localhost (default: none)
      port: 8545,            // Standard BSC port (default: none)
      network_id: "*",       // Any network (default: none)
    },
    bsc: {
      provider: () => new HDWalletProvider(MAINNET_DEPLOYER_KEY, BSC_RPC([
        `https://bsc-dataseed-archive-g1.nariox.org`, // Binance: This one is on GCP with better performance disk.
        `https://bsc-dataseed.binance.org/`,
        `https://bsc-dataseed.binance.org/`,
        `https://bsc-dataseed2.defibit.io/`,
        `https://bsc-dataseed1.defibit.io/`,
        `https://bsc-dataseed1.ninicoin.io/`,
        `https://bsc-dataseed2.defibit.io/`,
        `https://bsc-dataseed3.defibit.io/`,
        `https://bsc-dataseed4.defibit.io/`,
        `https://bsc-dataseed2.ninicoin.io/`,
        `https://bsc-dataseed3.ninicoin.io/`,
        `https://bsc-dataseed4.ninicoin.io/`,
        `https://bsc-dataseed1.binance.org/`,
        `https://bsc-dataseed2.binance.org/`,
        `https://bsc-dataseed3.binance.org/`,
        `https://bsc-dataseed4.binance.org/`,
      ])),
      network_id: 56,
      confirmations: 2,
      timeoutBlocks: 200,
      skipDryRun: false
    },
    "bsc-testnet": {
      provider: () => new HDWalletProvider(TESTNET_DEPLOYER_KEY, BSC_TESTNET_RPC([
        `https://data-seed-prebsc-1-s1.binance.org:8545`,
        `https://data-seed-prebsc-2-s1.binance.org:8545`,
        `https://data-seed-prebsc-1-s2.binance.org:8545`,
        `https://data-seed-prebsc-2-s2.binance.org:8545`,
        `https://data-seed-prebsc-1-s3.binance.org:8545`,
        `https://data-seed-prebsc-2-s3.binance.org:8545`,
      ])),
      network_id: 97,
      confirmations: 2,
      timeoutBlocks: 200,
      skipDryRun: true
    },
  },
  plugins: [
    'truffle-plugin-verify',
    'truffle-contract-size'
  ],
  api_keys: {
    etherscan: process.env.ETHERSCAN_API_KEY,
    bscscan: process.env.BSCSCAN_API_KEY,
    hecoinfo: process.env.HECOINFO_API_KEY,
    ftmscan: process.env.FTMSCAN_API_KEY,
    polygonscan: process.env.POLYGONSCAN_API_KEY,
  },
  // Configure your compilers
  compilers: {
    solc: {
      //https://forum.openzeppelin.com/t/how-to-deploy-uniswapv2-on-ganache/3885
      version: "0.8.17",    // Fetch exact version from solc-bin (default: truffle's version)
      // docker: true,        // Use "0.5.1" you've installed locally with docker (default: false)
      settings: {          // See the solidity docs for advice about optimization and evmVersion
        optimizer: {
          enabled: true,
          runs: 200
        },
      }
    },
  }
}