How to call a deployed contract function

Question

I deployed the smart contract into a test network. so if a new user is added to the test network and he wants to use my smart contract functions. How to call those functions by the new user in the test network

Answer 1

Using web3.js v1, you can do something like this:

let fs = require("fs");
let Web3 = require("web3");

async function run() {
    let web3 = new Web3(YOUR_ETHEREUM_NODE_ADDRESS);

    let abi = fs.readFileSync("YourContract.abi").toString();
    let contract = new web3.eth.Contract(JSON.parse(abi), YOUR_DEPLOYED_CONTRACT_ADDRESS);

    let transaction = contract.methods.yourMethod(yourArguments);

    let options = {
        to  : transaction._parent._address,
        data: transaction.encodeABI(),
        gas : await transaction.estimateGas({from: YOUR_PUBLIC_KEY}),
    };

    let signedTransaction = await web3.eth.accounts.signTransaction(options, YOUR_PRIVATE_KEY);
    let transactionReceipt = await web3.eth.sendSignedTransaction(signedTransaction.rawTransaction);

    return transactionReceipt;
}