QUESTION:

Unfortunately, my function finishes execution within seconds instead of executing in full. This is apparently due to the fact that listeners are declared to stream the data: they are not promises I can await to my knowledge.

How may I have my firebase function execute in full ?

CODE:

exports.fifteenMinutesData = functions
.runWith(runtimeOpts)
.pubsub
.schedule('*/15 * * * *')
.timeZone('Etc/UTC')
.onRun((context) => {
    return (async() => {
        try {

            const Client = require('ftp');
            const c = new Client();
            
            c.connect({
                host: "...",
                user: "..."
            });
            
            c.on('ready', async function () {
                c.get('text.txt', async function (err, stream) {
                    if (err)
                        throw err;
                    var content = '';
                    stream.on('data', function (chunk) {
                        content += chunk.toString();
                    });
                    stream.on('end', function () {
                        (async () => {

                            try {
                                let data = content;

                                //etc....
                            }
                            catch(err) {
                                console.log("ERR: "+err);
                            }
                        })()
                    })
                })
            })
        }
        catch(err) {
            console.log("ERR: "+err)
        }
    })()
});