Skip to content
Back
Functions

Appwrite send message to client?

View on Discord

Votes

0

Replies

11

Participants

Unknown

Messages

12

SkyOriginal post

Rank 1: Thread

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

Sky

Rank 1: Thread

Here is my function:

Plain text


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()})
    });


  }
};```
rafagazani

Rank 3: Container

I would try with realtime and listen to the account event

Binyamin

Rank 7: Quantum Computer

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.

JavaScript
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

Sky

Rank 1: Thread

oh like I would do that client-side?

Binyamin

Rank 7: Quantum Computer

This is one way, yes

Binyamin

Rank 7: Quantum Computer

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

Sky

Rank 1: Thread

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

Binyamin

Rank 7: Quantum Computer

Exactly

Sky

Rank 1: Thread

thanks so much guys 🙂

Sky

Rank 1: Thread

appwrite is amazing

Binyamin

Rank 7: Quantum Computer

Indeed

Join the discussion

Reply to this thread by joining our Discord.

Reply on Discord

Need support?_

Join DiscordGet premium support