Async Functions inside node_helper.js

magmirusr

I wrote a little MagicMirror module which web scrapes a website with puppeteer.
Therefore I’ve used async functions to fetch the data.
It’s working fine but as soon as I send it back to my main.js file it appears as a Promise and I can’t process the data.

Any suggestions how to wait for the data before sending it to the main.js file?

...
socketNotificationReceived : function(notification, payload) {
var self = this
switch(notification)
{case"CASE_1":
text = scrape("https...")
this.sendSocketNotification("text",text)
break}}
...
async function scrape(url){
try{
const browser = await puppeteer.launch()
const page = await browser.newPage();
await page.goto(url)

const [el] await page.$x("...")
const txt = await el.getProperty("textContent")
const rawTxt = await txt.jsonValue
browser.close()
return rawTxt} catch {
return "ERROR"}}

Jalibu

https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Asynchronous/Async_await

sdetweil

@magmirusr you will have to do promise.then in the non-async method to wait for the data

bizzeonline

Hence I’ve utilized async capacities to get the information.

It’s turned out great however when I send it back to my main.js record it shows up as a Promise and I can’t handle the information.
Thanks.
Aaki working at Bizzeonine

MMRIZE

@magmirusr

case "CASE_1":
  scrape("...").then((text) => {
    this.sendSocketNotification("text", text)
  })
  break

Or

case "CASE_1"
  const AsyncJob = async () => {
    var text = await scrape("...")
    this.sendSocketNotification("text", text) 
  }
  AsyncJob()
  break

magmirusr

@mmrize
Thank you very much!!! It’s working now. :)