Angular and Firebase Cloud Functions return null

Question

I am working on a payment system. I simulate the node.js using cloud functions. I send a request from Angular to Cloud Functions. Then, I send the second request from cloud functions to payment API. Payment API gets the request successfully and payment is successful. But, I guess because of an async structure, the response is shown as null on the Angular side.

Angular Code:

constructor(private fns: AngularFireFunctions) { } ... ... const callable = this.fns.httpsCallable('app'); var data = callable({req: request}) data.subscribe(async res => { console.log(res); });

Cloud functions:

exports.app = functions.https.onCall((data, context) => { var res = ""; iyzipay.payment.create(data.req, function (err, result) { res = result; }); return res; });

How can I wait for the response? I tried async/await but I don't know these subjects entirely. Thank you!

CaglarCaliskan · Accepted Answer · 2020-11-20 21:18:49Z

After continuing the search, I found a solution like that:

Cloud functions:

exports.app = functions.https.onCall((data, context) => { return new Promise((Resolve, Reject) => { iyzipay.payment.create(data.req, async function (err, result) { if (err) { Reject({ id: 'Payment', message: err }) } if (result && result.status == 'failure') { Reject({ id: 'Payment Failed', message: result.errorMessage }) } Resolve(result) }); }); });

And angular side like Akif said:

 const callable = this.fns.httpsCallable('app'); const res = await callable({ req: request }).toPromise(); console.log(res);

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