Scope of NodeJS API function - Firebase Function & Twitter API

Question

I'm trying to send a response from the Twitter API to the Firebase HTTP response - abit confused by the scope in Node. I'm getting a console.log on the firebase server so everything is set up fine with the Twitter API. I can't figure out how to pass the response from inside the GET req to a external variable, which intail will send the Firebase HTTP response.


exports.twitterFunction = functions.https.onRequest((request, response) => {

  const client = new Twitter({
    consumer_key: "",
    consumer_secret: "",
    access_token_key: "",
    access_token_secret: ""
  });

  const params = { screen_name: "" };
  const latesttweet = "";

  client.get("statuses/user_timeline", params, (error, tweets, response) => {
    if (error) throw error;
    this.latesttweet = tweets[0].text;
    console.log(tweets[0].text);
    console.log(latesttweet);
  });

  response.send(latesttweet);

});

Doug Stevenson · Accepted Answer · 2019-11-05 12:42:39Z

2

client.get() is asynchronous and returns immediately, before the data is available. The data will be available some time later in the callback function that you passed to it. Therefore, you should be sending the response from inside the callback, since that's where your data will be available.

  client.get("statuses/user_timeline", params, (error, tweets, response) => {
    if (error) throw error;
    this.latesttweet = tweets[0].text;
    console.log(tweets[0].text);
    console.log(latesttweet);
    response.send(latesttweet);   // move this inside the callback
  });

answered Nov 5, 2019 at 12:42

Doug Stevenson

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1 Comment

Matt B Over a year ago

Thank you Doug - knew it would be something simple!

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