Retrieving Global Context Data in onConnection from ui_base.js in Node-RED

General
1

I'm working with the ui_base.js file in Node-RED and need to retrieve session data stored in the global context during the onConnection method of a socket connection. Normally, I would use the following code to retrieve session data:

javascript

let sessionData = global.get(sessionId);
console.log("sessionData:", sessionData);

However, when I try this, I get the error: global.get is not a function.

How can I properly retrieve the session data from the global context within the ui_base.js file during a socket connection? Is there a way to access the global context in this context or another approach I should be using?

Any help would be appreciated. Thanks!

2

Does't ui_base run in the client browser session? You can't access context data (which is in the server) from within the browser, which may be the other side of the world.

3

no it is server side script.
I'm working on a Node-RED project where I handle session management on the server side and store user details (such as session ID, username, and email) in the global context after a successful login. Here's the function I use to create and store the session on login:

if (user) {
    // Generate unique session ID
    const sessionId = generateSessionId(user.username);

    // Set the session ID as a cookie in the msg.headers
    msg.headers = {
        'Set-Cookie': `session_id=${sessionId}; HttpOnly; Max-Age=900`
    };
    console.log("User login cookies session:", msg.headers);

    // Store session information in global context
    global.set(sessionId, {
        username: user.username,
        email: user.email,
        loggedIn: true,
        sessionId: sessionId
    });

    msg.payload = {
        message: 'Login successful',
        username: user.username,
        email: user.email
    };
    msg.statusCode = 200;
} else {
    msg.payload = {
        error: 'Invalid credentials',
        redirect: 'http://localhost:1880/login'
    };
    msg.statusCode = 401;
}
return msg;

function generateSessionId(username) {
    return username + '-' + Math.random().toString(36).substr(2, 9) + Date.now();
}

After storing the session, I try to retrieve it in my ui-base.js file through a WebSocket connection like this:

function onConnection(socket) {
    uiShared.connections[socket.id] = socket;

    let cookies = socket.request.headers.cookie;
    console.log("Cookies in socket:", cookies);

    let sessionId = cookies.split(';').find(cookie => cookie.trim().startsWith('session_id='));

    if (sessionId) {
        sessionId = sessionId.split('=')[1];
        console.log("Session ID from the WebSocket connection:", sessionId);

        // Try to retrieve the session from global context
        let storedSession = global.get(sessionId);
        console.log("Stored session:", storedSession);
    } else {
        console.log("session_id not found in cookies");
    }

    emitConfig(socket);
    setupEventHandlers(socket, true);
}

The issue I'm facing is that when I attempt to retrieve the session using global.get(sessionId), I get an error: "global.get is not a function". I understand that this may be a scoping issue or something specific to Node-RED's handling of global context in different parts of the system, but I'm unsure how to resolve it.

Has anyone faced a similar issue, or does anyone know how I can properly access the global context from within this WebSocket connection code?