start_robot_browser.js

#!/usr/bin/env node
const { firefox } = require("playwright");
const logId = "start_robot_browser.js";

// You may want to change this to test that the
// robot is using certificates that are valid for its real hostname
let robotHostname = "localhost"; // or NGROK_URL
if (process.argv.length > 2) {
    robotHostname = process.argv[2];
}

(async () => {
    const navigation_timeout_ms = 30000; //30 seconds (default is 30 seconds)
    const min_idle_time = 1000;
    var try_again = true;
    var num_tries = 0;
    var max_tries = 50; // -1 means try forever

    ///////////////////////////////////////////////
    // sleep code from
    // https://stackoverflow.com/questions/951021/what-is-the-javascript-version-of-sleep
    function sleep(ms) {
        return new Promise((resolve) => setTimeout(resolve, ms));
    }
    ///////////////////////////////////////////////

    const browser = await firefox.launch({
        headless: true, // default is true
        defaultViewport: null,
        // NOTE: I (Amal) believe the below args are unnecessary now that we've switched from Chromium to Firefox.
        args: [
            "--use-fake-ui-for-media-stream", //gives permission to access the robot's cameras and microphones (cleaner and simpler than changing the user directory)
            "--disable-features=WebRtcHideLocalIpsWithMdns", // Disables mDNS hostname use in local network P2P discovery. Necessary for enterprise networks that don't forward mDNS traffic
            "--ignore-certificate-errors",
        ],
        firefoxUserPrefs: {
            "permissions.default.microphone": 1, // Give permission to access the robot's microphone
        },
    });

    const context = await browser.newContext({ ignoreHTTPSErrors: true }); // avoid ERR_CERT_COMMON_NAME_INVALID

    const page = await context.newPage();
    page.on("console", (msg) => console.log(msg));

    while (try_again) {
        try {
            await page.goto(`https://${robotHostname}/robot`);
            console.log(logId + ": finished loading");
            try_again = false;
        } catch (e) {
            console.log(logId + ": trying again");
            console.log(e);
            await sleep(200);
            try_again = true;
        }
    }

    console.log(logId + ": start script complete");
})();