Executing multiple instances of a Firebase cloud function

Question

Executing multiple instances of a Firebase cloud function

I am working with a Firebase (Google) cloud function that is structured like this

// Initialize the Auth0 client
var AuthenticationClient = require('auth0').AuthenticationClient;
var auth0 = new AuthenticationClient({
    domain:       'familybank.auth0.com',
    clientID:     'REDACTED'
});

function retrieveAccountBalance(app) {
    console.log('accessToken: ' + app.getUser().accessToken);
    auth0.getProfile(app.getUser().accessToken, function (err, userInfo) {
        if (err) {
            console.error('Error getting userProfile from Auth0: ' + err);
        }
        console.log('getAccountBalance userInfo:' + userInfo)

        let accountOwner = app.getArgument(PARAM_ACCOUNT_OWNER);

        // Query Firestore based on user
        var transactions = db.collection('bank').doc(userInfo.email)
                          .db.collection('accounts').doc(accountOwner)
                          .collection('transactions');
        var accountBalance = transactions.get()
            .then( snapshot => {
                var workingBalance = 0
                snapshot.forEach(doc => {
                    workingbalance = workingbalance + doc.data().amount;
                });

                app.tell(accountOwner + " has a balance of $" + workingBalance)
            })
            .catch(err => {
                console.log('Error getting transactions', err);
                app.tell('I was unable to retrieve your balance at this time.')
            });
    });
}
actionMap.set(INTENT_ACCOUNT_BALANCE, retrieveAccountBalance);
app.handleRequest(actionMap);

Upon execution, I encounter the following logs

https://i.stack.imgur.com/hgtJj.jpg

There seems to be a recurring issue where parts of the function are being executed multiple times and some calls are failing. Interestingly, if I terminate the auth0.getProfile call after logging userInfo, the function works but lacks the necessary userInfo.

Can anyone shed light on why certain parts of this function are running repeatedly and why some calls are unsuccessful?

node.js firebase google-cloud-functions auth0

Answer 1

Answer №1

At line (2), the userInfo variable is undefined due to an error that occurred just before it was logged. The code within the error block does not exit the function, causing it to continue running with an invalid userInfo object.

However, the issue of the callback being called twice – once with a valid userInfo and once with an err – remains unclear. According to the documentation for

AuthenticationClient.getProfile()

, it returns a Promise or undefined. This ambiguity raises the question of whether this dual callback scenario could be triggered by invoking the promise twice.

Considering the promise return, you can achieve similar functionality without a callback by utilizing the following approach:

function checkBalance(service) {
    let user = service.getTarget(PARAM_USER);
    console.log('Token: ' + service.getUser().token);
    var token = service.getUser().token;
  
    auth0.getProfile(token).then(userInfo => {
        console.log('User Info:' + userInfo)

        // Querying firestore based on user
        var transactions = db.collection('bank').doc(userInfo.email)
                          .db.collection('accounts').doc(user)
                          .collection('transactions');
        return transactions.get();
      })

      .then(snapshot => {
        var balance = 0;
        snapshot.forEach(doc => {
          balance += doc.data().amount;
        });

        service.tell(user + " has a balance of $" + balance);
      })

      .catch(error => {
        console.error('Error:', error );
        service.tell('Unable to retrieve your balance at this time.');
      });
}

Answer 2

At line (2), the userInfo variable is undefined due to an error that occurred just before it was logged. The code within the error block does not exit the function, causing it to continue running with an invalid userInfo object.

However, the issue of the callback being called twice – once with a valid userInfo and once with an err – remains unclear. According to the documentation for

AuthenticationClient.getProfile()

, it returns a Promise or undefined. This ambiguity raises the question of whether this dual callback scenario could be triggered by invoking the promise twice.

Considering the promise return, you can achieve similar functionality without a callback by utilizing the following approach:

function checkBalance(service) {
    let user = service.getTarget(PARAM_USER);
    console.log('Token: ' + service.getUser().token);
    var token = service.getUser().token;
  
    auth0.getProfile(token).then(userInfo => {
        console.log('User Info:' + userInfo)

        // Querying firestore based on user
        var transactions = db.collection('bank').doc(userInfo.email)
                          .db.collection('accounts').doc(user)
                          .collection('transactions');
        return transactions.get();
      })

      .then(snapshot => {
        var balance = 0;
        snapshot.forEach(doc => {
          balance += doc.data().amount;
        });

        service.tell(user + " has a balance of $" + balance);
      })

      .catch(error => {
        console.error('Error:', error );
        service.tell('Unable to retrieve your balance at this time.');
      });
}

Executing multiple instances of a Firebase cloud function

Answer №1

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