How to get all data after callback method?

Question

I am using node js to get all contact data from Google API. USing callback function but it takes some time to get data due to run function before next function. I am very new in node JS can someone help me to sort it out. I want all data return once the callback function is called.

A contact function to get all contacts.

app.get('/contacts', async function(req, res){
  
  // Rendering our web page i.e. Demo.ejs
  // and passing title variable through it
    fs.readFile('credentials.json', (err, content) => {
    if (err) return console.log('Error loading client secret file:', err);
    // Authorize a client with credentials, then call the Google Tasks API.
     await  authorize(JSON.parse(content), listConnectionNames);
     res.send(full_person_array)
  });
  

})

This one is autorize function that callback listConnectionNames fucntion.

function authorize(credentials, callback) {

  return new Promise((resolve, reject) => {
    const {client_secret, client_id, redirect_uris} = credentials.installed;
    const oAuth2Client = new google.auth.OAuth2(
        client_id, client_secret, redirect_uris[0]);
  
    // Check if we have previously stored a token.
    fs.readFile(TOKEN_PATH, (err, token) => {
      if (err) return getNewToken(oAuth2Client, callback);
      oAuth2Client.setCredentials(JSON.parse(token));
      callback(oAuth2Client, id);
      return resolve();

    });

  })
 
}


function listConnectionNames(auth) {
  const service = google.people({version: 'v1', auth});
  service.people.connections.list({
    resourceName: 'people/me',
    pageSize: 50,
    personFields: 'names,emailAddresses,phoneNumbers',
  }, (err, res) => {
    if (err) return console.error('The API returned an error: ' + err);
    const connections = res.data.connections;
    if (connections) {
      console.log('Connections:');
      connections.forEach((person) => {
        console.log(person);
        full_person_array.push(person);
      });
    } else {
      console.log('No connections found.');
    }
  });
}

How to get all data in contact without get delayed empty data.

nem0z · Accepted Answer · 2022-07-21 08:34:56Z

0

You can add returns instead of mapping the result array to fill an other array :

function authorize(credentials) {

    const {
        client_secret,
        client_id,
        redirect_uris
    } = credentials.installed;
    const oAuth2Client = new google.auth.OAuth2(
        client_id, client_secret, redirect_uris[0]);

    // Check if we have previously stored a token.
    return fs.readFile(TOKEN_PATH, (err, token) => {
        if (err) return getNewToken(oAuth2Client);
        oAuth2Client.setCredentials(JSON.parse(token));
        return oAuth2Client;

    });
}


async function contact() {
    let auth = await authorize(credentials);
    let connections = await listConnectionNames(auth, id);
    console.log(connections); // full result
}

Does it helps you ?

edited Jul 21, 2022 at 8:34

answered Jul 21, 2022 at 7:15

nem0z

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12 Comments

Impunkj Over a year ago

For passing auth, I need to run an authorized function first. so in contact function it wait to get authorized i want to return data onlly once all data is come up

Impunkj Over a year ago

Yes and authorize is call in contacts function.

Impunkj Over a year ago

let connections = await listConnectionNames(auth, test); ^^^^^ SyntaxError: await is only valid in async functions and the top level bodies of modules

Impunkj Over a year ago

Getting Error posted abobe.

nem0z Over a year ago

Well, you can delete this line, it's no more used as you call listConnectionNames as a callback inside authorize

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