Impossible to handle your errors on my API

Hi! I’m using your module on my API and it’s run perfectly using my oauth2 generated tokens! However, when the token has expired I’m having issues catching the exception.

So this is a problem, because my application crashes due this fail instead of notifying the user their token has expired. How to fix and catch this problem?

This is my try/catch error.

var Gmail = require('node-gmail-api')
var userKey = 'INVALID USER TOKEN HERE'

try {
  var gmail = new Gmail(userKey)
  var s = gmail.messages('label:inbox', { max: 10 })
  s.on('data', function (d) {
    console.log(d.snippet)
  })
}
catch(e) {
    console.log('Your credentials are wrong')
    return 0;
}

So when the token is not valid I have reported this issue:

events.js:160
      throw er; // Unhandled 'error' event
      ^

Error: Invalid Credentials
    at Request._callback (/node_modules/node-gmail-api/index.js:84:37)
    at Request.self.callback (/node_modules/request/request.js:186:22)
    at emitTwo (events.js:106:13)
    at Request.emit (events.js:191:7)
    at Request.<anonymous> (/node_modules/request/request.js:1081:10)
    at emitOne (events.js:96:13)
    at Request.emit (events.js:188:7)
    at IncomingMessage.<anonymous> (/node_modules/request/request.js:1001:12)
    at IncomingMessage.g (events.js:291:16)
    at emitNone (events.js:91:20)

[ferreiro]

I reply myself to message of Dec 12, 2016 about handling this error. I found a really great stack overflow post that teaches how to handle different errors depending on code implementation and the way new errors are generated.

Best practice for exception handling

So! According to this post (and of course I’ve tried it out), we have to listen for errors before doing any other operation, like the following code (this code is extracted from a real project i’m working on):

fetchAllMessagesFromGmail (url, opts, callback) {
    let messages = []
    var gmail = new Gmail(token)
    var s = gmail.messages('label:inbox', { max: 30 })

    s.on('error', (err) => {
      return callback(err, null)
    })

    s.on('data', function (message) {
      messages.push(message)
    })

    s.on('finish', () => {
      return callback(null, messages)
    })
}

[nathanbowser]

👍