How can I get the Hedera JS SDK to shut down gracefully?

Question

I am using hedera-sdk-js, version 2.37.0, installed from @hashgraph/sdk on NPM. ​

When I run a script in NodeJs, the process remains open indefinitely, and in order to force it to terminate, I have been using process.exit(0);. This works, but is not ideal - I would prefer that it terminates gracefully. ​

Is there a way to do this? ​

---

​

Details:

Here is the current script ​

import dotenv from 'dotenv';
import {
    Client,
    AccountId,
    PrivateKey,
} from '@hashgraph/sdk';
​
dotenv.config();
main();
​
async function main() {
    if (!process.env.ACCOUNT_ID ||
        !process.env.ACCOUNT_PRIVATE_KEY) {
        throw new Error('Please set required keys in .env file.');
    }
​
    const accountId = AccountId.fromString(process.env.ACCOUNT_ID);
    const accountKey = PrivateKey.fromStringECDSA(process.env.ACCOUNT_PRIVATE_KEY);
    const client = Client.forTestnet().setOperator(accountId, accountKey);
​
    // ... do some things here ...
​
    process.exit(0); // <-- NOTE would like to remove this
}
​

Answer 1

The Client instance is keeping the Javascript event loop open. For a graceful shutdown of your script, you simply need to stop the Client instance, using .close().

Here's the modified version of your code example, only one line has changed:

import dotenv from 'dotenv';
import {
    Client,
    AccountId,
    PrivateKey,
} from '@hashgraph/sdk';

dotenv.config();
main();

async function main() {
    if (!process.env.ACCOUNT_ID ||
        !process.env.ACCOUNT_PRIVATE_KEY) {
        throw new Error('Please set required keys in .env file.');
    }

    const accountId = AccountId.fromString(process.env.ACCOUNT_ID);
    const accountKey = PrivateKey.fromStringECDSA(process.env.ACCOUNT_PRIVATE_KEY);
    const client = Client.forTestnet().setOperator(accountId, accountKey);

    // ... do some things here ...

    client.close() // Replaced process.exit with client.close
}