Appwrite send message to client?

Hey all, in my project I needed to have different session limits per user. So with the advice of Matej, I created a collection that stores attributes userId and limit.

Then I created a function that fired on users..sessions..create

It checks if a user's session has gone over their limit. Right now if that is true, it will delete the session. The issue is I need to send the response to the client with the error message, with the idea that I can deny the login request.

I was looking through the documentation, I'm not sure how to send a message back to the client manually. I think as an API this the things like res.json({}) are supposed to be returned?

I think a workaround, if I can send any type of message to the client I could have them listen and then fire the logout() that way.

The client is using appwrite web sdk and svelte

TL;DR

The user is trying to send a message to the client using Appwrite. They are looking for a way to send a response to the client with an error message in order to deny a login request. They are unsure of how to do this and are considering using the `logout()` function as a workaround. The user is using the Appwrite web SDK and Svelte. Solution: One possible solution is to use the Appwrite Realtime feature to subscribe to updates and fire an event when the session is deleted. Additionally, the user can try using the `res.json` function to send a response to the client with an error message. The

Here is my function:

TypeScript


module.exports = async function (req, res) {
  if (req.headers != 'website') {
    const client = new sdk.Client();
    const database = new sdk.Databases(client);
    
    client
    .setEndpoint(req.variables['APPWRITE_FUNCTION_ENDPOINT'])
    .setProject(req.variables['APPWRITE_FUNCTION_PROJECT_ID'])
    .setKey(req.variables['APPWRITE_FUNCTION_API_KEY']);

    const users = new sdk.Users(client);
    const docs = database.listDocuments('640c0c2b8e955c6e66ae', '640c0c315d02c25dc798'); // database ID, collection ID
    let data = null;
    let userId = null;

    try {
      data = JSON.parse(req.variables.APPWRITE_FUNCTION_EVENT_DATA);
      userId = data.userId;
    } catch (err) {
      res.json({'error': err.toString()});
    }
    
    docs.then(function (documents) {
      // let id = result.documents[0].userId
      // let limit = result.documents[0].limit
      let doc = null;

      for (let i = 0; i < documents.documents.length; i++) {
        if (documents.documents[i].userId == userId) {
          doc = documents.documents[i];
          break;
        }
      }

      if (doc) {
        const sessions = users.listSessions(userId);
        sessions.then(function (userSessions) {
          // res.json({documents, userSessions}); // Success
          if (userSessions.total > 1) {
            if (userSessions.total > doc.limit) {
              res.send("user sessions over document limit");
              // delete session
            }
            
          } else {
            res.send("1 session");
          }
        }, function (err) {
          res.json({'error': err.toString()})
        }); 
      }

    }, function (error) {
        res.json({'error': error.toString()})
    });

  }
};```

I would try with realtime and listen to the account event

There is no way to send information out But, you do have few options to tackle this challenge you can try to use AppWrite realtime like so (in case your function id is aaa111bbb.

TypeScript

client.subscribe('functions.aaa111bbb.executions.*.update', response => {
  // check the user login status for the session
});

But it's sound like to much resources for this task

oh like I would do that client-side?

This is one way, yes

Or you can give the user just reading access for the document length and listen to it in realtime So in that case the only the realtime will fire a new event is when is session got deleted

oh okay that is awesome, theoretically I could subscribe to the account or session client side? and if that changes, i can logout

Exactly

thanks so much guys 🙂

appwrite is amazing

Indeed

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