@firefly-exchange/firefly-client/examples/Sockets/5-exchange-health-update.ts

The Firefly Client Library allows traders to sign, create, retrieve and listen to orders on Firefly Exchange.

/**
 * Listens for exchange health
 */

/* eslint-disable no-console */
import { FireflyClient, MARKET_SYMBOLS, Networks } from "../../index";

async function main() {
  // no gas fee is required to create order signature.
  const dummyAccountKey =
    "a182091b4d5a090b65d604e36f68629a692e3bf2aa864bd3f037854034cdd676";

  const client = new FireflyClient(
    true,
    Networks.TESTNET_ARBITRUM,
    dummyAccountKey
  ); // passing isTermAccepted = true for compliance and authorizarion

  // load/init contract addresses
  await client.init();

  client.addMarket(MARKET_SYMBOLS.ETH);

  const callback = ({ isAlive }: { isAlive: boolean }) => {
    console.log(`Exchange is alive: ${isAlive}`);

    // kill sockets in order to stop script
    client.sockets.close();
  };
  const connection_callback = async () => {
    // This callback will be invoked as soon as the socket connection is established

    // triggered when exchange health updates are received
    client.sockets.onExchangeHealthChange(callback);
  };

  const disconnection_callback = async () => {
    console.log("Sockets disconnected, performing actions...");
  };

  // must specify connection_callback before opening the sockets below
  await client.sockets.listen("connect", connection_callback);
  await client.sockets.listen("disconnect", disconnection_callback);

  console.log("Making socket connection to firefly exchange");
  client.sockets.open();
}

main().then().catch(console.warn);