Ethereum Event Listener

Node Script-event listener

const ethers = require("ethers");
const TetherTokenABI = require("../ABI/TetherToken.json");
const MyContractAbi = require("../ABI/EventEmitter.json");

require("dotenv").config();

const listenToTether = async () => {
  const USDT = "0x509Ee0d083DdF8AC028f2a56731412edD63223B9";

  const provider1 = new ethers.providers.WebSocketProvider(
    process.env.REACT_APP_GOERLI_RPC_URL_WS
  );
  
  // OR
  
  const provider2 =  new ethers.providers.Web3Provider(window.ethereum);
  
  const tokenContract = new ethers.Contract(USDT, TetherTokenABI, provider1);

  tokenContract.on("Transfer", (from, to, value, event) => {
    console.log(" Transfer Event Detected! ", from, to, event);
  });

  const MyContractAdd = "0xe518CC0Bf7cC0fc891FBfeF00EA4cB1ab8A95cB1";
  const myContract = new ethers.Contract(
    MyContractAdd,
    MyContractAbi,
    provider.getSigner()
  );

  myContract.on("InputReceived", (caller, input, event) => {
    console.log("Event Emitted:", caller, input, event);
  });

  console.log("Listening.......", process.env.REACT_APP_GOERLI_RPC_URL_WS);
};

listenToTether().catch(console.log);

React Use Effect Hook

useEffect(() => {
    if (web3Props.signer) {
      const contract = new ethers.Contract(
        "0xe518CC0Bf7cC0fc891FBfeF00EA4cB1ab8A95cB1",
        EventEmitterABI,
        web3Props.signer // or provider
      );

      contract.on("InputReceived", (caller, input, event) => {
        console.log("LISTENER TRIGGERED! ", caller, input, event.args);
        setEventData([caller, input, event]);
      });
      return function cleanupListener() {
        contract.removeAllListeners("InputReceived");
      };
    }
  }, [web3Props]);