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Using Custom Contracts

Recap

Section titled “Recap”
  1. We have created a custom contract
  2. We have connected the custom Contracts
  3. Now we are ready to test them! Follow the steps below.
/**
* Run:
* npm install ethers dotenv
*/


import { Contract, JsonRpcProvider, Wallet } from "ethers";
import dotenv from "dotenv";
dotenv.config();


const SEND_NUMBER_ADDR = "0xd2AAa00100000000000000000000000000000000";
const SEND_NUMBER_ABI = [
  "function sendNumber(uint256 number) external",
  "function lastNumber() external view returns (uint256)"
];


const sChainAProvider = new JsonRpcProvider(process.env.RPC_URL);
const sChainBProvider = new JsonRpcProvider(process.env.PRC_URL);


const wallet = new Wallet(process.env.PRIVATE_KEY, sChainAProvider);
const contractA = new Contract(SEND_NUMBER_ADDR_A, SEND_NUMBER_ABI, wallet);
const contractB = new Contract(SEND_NUMBER_ADDR_B, SEND_NUMBER_ABI, sChainBProvider);
const txA = await contractA.sendNumber(BigInt(5));
await txA.ok();


// The following can be replaced with "listening for an event", however,
// a while loop is more intuitive for a new developer
while (true) {
  const lastNumber = await contractB.lastNumber();
  if (lastNumber === BigInt(5)) {
    console.log("Posted!");
    break;
  }
  await new Promise(res => setTimeout(res, 2000)); // Sleep 2 seconds
}