🚅Subscription

Get automatically notified about any margin account changes

Github repository: https://github.com/zetamarkets/sdk/tree/main/examples/subscription

Subscribing to changes to onchain is easy using subscription.subscribeProgramAccounts. In this example we subscribe to any SOL margin account changes, but you can subscribe to any account types you wish to track.

Code

require("dotenv").config();

import {
  Exchange,
  Network,
  utils,
  types,
  programTypes,
  subscription,
  constants,
} from "@zetamarkets/sdk";

import { PublicKey, Connection } from "@solana/web3.js";

const NETWORK_URL = process.env["network_url"]!;

let network: Network;

switch (process.env["network"]) {
  case "localnet":
    network = Network.LOCALNET;
    break;
  case "devnet":
    network = Network.DEVNET;
    break;
  case "mainnet":
    network = Network.MAINNET;
    break;
  default:
    throw Error("Unsupported network type!");
}

async function main() {
  // Create a solana web3 connection to devnet.
  const connection = new Connection(NETWORK_URL, "confirmed");

  const loadExchangeConfig = types.defaultLoadExchangeConfig(
    network,
    connection,
    utils.defaultCommitment(),
    0, // ThrottleMs - increase if you are running into rate limit issues on startup.
    true
  );

  await Exchange.load(
    loadExchangeConfig,
    // Exchange wallet can be ignored for normal clients.
    undefined
  );

  subscription.subscribeProgramAccounts<programTypes.CrossMarginAccount>(
    types.ProgramAccountType.CrossMarginAccount,
    async (
      data: subscription.AccountSubscriptionData<programTypes.CrossMarginAccount>
    ) => {
      // Here you can filter for only accounts you care about (such as your own)
      console.log(data);
    }
  );

  await utils.sleep(100_000);

  // Close to end the websockets.
  // await Exchange.close();
}

main().catch(console.error.bind(console));