hp-devkit/docker/code-templates/nodejs/npl-client/_projname_.js

const readline = require('readline');
const HotPocket = require('hotpocket-js-client');

async function clientApp() {

    const userKeyPair = await HotPocket.generateKeys();
    const client = await HotPocket.createClient(['wss://localhost:8081'], userKeyPair);

    // Establish HotPocket connection.
    if (!await client.connect()) {
        console.log('Connection failed.');
        return;
    }

    console.log('HotPocket Connected.');

    // start listening for stdin
    const rl = readline.createInterface({
        input: process.stdin,
        output: process.stdout
    });

    // On ctrl + c we should close HP connection gracefully.
    rl.on('SIGINT', () => {
        console.log('SIGINT received...');
        rl.close();
        client.close();
    });

    // This will get fired if HP server disconnects unexpectedly.
    client.on(HotPocket.events.disconnect, () => {
        console.log('Disconnected');
        rl.close();
    });

    // This will get fired when contract sends an output.
    client.on(HotPocket.events.contractOutput, (r) => {
        r.outputs.forEach(output => {
            if (output.type == "rndResult") {
                if (output.status == "ok")
                    console.log(`(ledger:${r.ledgerSeqNo})>> ${JSON.stringify(output)}`);
                else
                    console.log(`(ledger:${r.ledgerSeqNo})>> Rnd failed. reason: ${output.error}`);
            }
            else {
                console.log("Unknown contract output.");
            }
        });
    });

    console.log("Ready to accept inputs.");

    const input_pump = () => {
        rl.question('', async (inp) => {
            let input;
            if (inp.startsWith("rnd")) {

                input = await client.submitContractInput(JSON.stringify({
                    type: "rnd"
                }));
            }
            else {
                console.log("Invalid command. [rnd] expected.")
            }

            if (input) {
                const submission = await input.submissionStatus;
                if (submission.status != "accepted")
                    console.log("Submission failed. reason: " + submission.reason);
            }

            input_pump();
        })
    }
    input_pump();
}

clientApp();