How do I determine the network within a truffle exec script?

Question

I'm writing a script to be executed with truffle exec and I need to add some logic conditional on the network we're calling truffle exec with.

This is (roughly) what I want in my script:

const contract = artifacts.require("./MyContract.sol");
module.exports = function(callback) {
  // TODO: Do some conditional thing based on network!

  contract.callMethod();
}

I'm hoping to call this script in the following way:

truffle exec script.js --network ropsten

Answer 1

Not sure if this is the best method, but the arguments you pass to truffle, including the network, are available under process.argv.

script.js:

process.argv.forEach(function (val, index, array) {
  console.log(index + ': ' + val);
});

Then:

> truffle exec script.js --network development
Using network 'development'.

0: /usr/bin/node
1: /usr/bin/truffle
2: exec
3: foo.js
4: --network
5: development

So access that array at the relevant index for the network name.

Answer 2

You can use web3.eth.network api .

'use strict';

global.artifacts = artifacts;
global.web3 = web3;

async function main(){
    const newtworkType = await web3.eth.net.getNetworkType();
    const networkId = await web3.eth.net.getId();
    console.log("network type:"+newtworkType);
    console.log("network id:"+networkId);
}

// For truffle exec
module.exports = function(callback) {
    main().then(() => callback()).catch(err => callback(err))
};

I hope it can be useful :)

Answer 3

As of Aug 2020 Truffle makes the config global available to scripts. The network property is set in the usual way.

module.exports = function(callback) {
  const network = config.network;
  if (network == 'development') {
     ...
  }
  callback();
}

Answer 4

Or you can find the "--network" position argument inside process.argv and following logic next one should be the network name:

module.exports = async (callback) => {
const networkIndex = process.argv.findIndex(arg => arg === '--network');
const networkName = process.argv[networkIndex + 1];
console.log(networkName);

callback();
}

Answer 5

You can define your network in truffle-config.js

For example:

const HDWalletProvider = require('truffle-hdwallet-provider');

module.exports = {
  test: {
    host: `127.0.0.1`,
    port: 9999,
    network_id: 3,
    gas: 5500000,
    confirmations: 2,
    timeoutBlocks: 200,
    skipDryRun: true
  },
  ropsten: {
    provider: () => new HDWalletProvider(mnemonicOrPrivatekey, `https://rinkeby.infura.io/${infuraKey}`),
    network_id: 3,
    gas: 5500000,
    confirmations: 2,
    timeoutBlocks: 200,
    skipDryRun: true
  },
}

Then you can run script with --network test