Errors don't include a valid stack

[benoitvidis]

The stack for errors is taken from kuzzle response, which is in most cases empty, and if not, most likely useless to developers.

A valid stack showing from where the sdk method was called would be nice to have.

[Aschen]

I just tried to keep the original stack but since we use the event-emitter mechanism to deal with requests and responses I'm not able to have a meaningful stacktrace 😞

KuzzleError: Caught an unexpected plugin error: some error
This is probably not a Kuzzle error, but a problem with a plugin implementation.
    at Listener.fn (/home/aschen/projets/kuzzleio/sdk-javascript/src/protocols/abstract/Base.js:86:31)
    at HttpProtocol.emit (/home/aschen/projets/kuzzleio/sdk-javascript/src/core/KuzzleEventEmitter.js:97:22)
    at /home/aschen/projets/kuzzleio/sdk-javascript/src/protocols/Http.js:218:36
    at processTicksAndRejections (internal/process/task_queues.js:97:5) {
  status: 500,
  backendStack: 'Error: some error\n' +
    '    at BaseController.handler [as vault] (/home/aschen/projets/kuzzleio/kuzzle/features-sdk/application/functional-tests-app.ts:95:15)\n' +
    '    at doAction (/home/aschen/projets/kuzzleio/kuzzle/lib/api/funnel.js:748:47)\n' +
    '    at Funnel.processRequest (/home/aschen/projets/kuzzleio/kuzzle/lib/api/funnel.js:414:34)',
  id: 'plugin.runtime.unexpected_error',
  code: 67239938
}

[Aschen]

To reproduce:

1. clone this branch: https://github.com/kuzzleio/sdk-javascript/tree/539-meaningful-stacktrace

2. Use this code

const { Kuzzle, WebSocket } = require('./index')

const kuzzle = new Kuzzle(new WebSocket('localhost'))

kuzzle.on('networkError', error => console.log(error));

const run = async () => {
  await kuzzle.connect();
  try {
    console.log(await kuzzle.query({
      controller: 'tsts',
      action: 'vault'
    }))
  }
  catch (error) {
    console.log(error)
  }
};

run();

3. run it: node -r ts-node/register test.js

Result

KuzzleError: API controller "tsts" not found.
    at Listener.fn (/home/aschen/projets/kuzzleio/sdk-javascript/src/protocols/abstract/Base.ts:119:23)
    at WebSocketProtocol.emit (/home/aschen/projets/kuzzleio/sdk-javascript/src/core/KuzzleEventEmitter.ts:130:16)
    at WebSocket.client.onmessage (/home/aschen/projets/kuzzleio/sdk-javascript/src/protocols/WebSocket.ts:159:16)
    at WebSocket.onMessage (/home/aschen/projets/kuzzleio/sdk-javascript/node_modules/ws/lib/event-target.js:120:16)
    at WebSocket.emit (events.js:310:20)
    at Receiver.receiverOnMessage (/home/aschen/projets/kuzzleio/sdk-javascript/node_modules/ws/lib/websocket.js:800:20)
    at Receiver.emit (events.js:310:20)
    at Receiver.dataMessage (/home/aschen/projets/kuzzleio/sdk-javascript/node_modules/ws/lib/receiver.js:436:14)
    at Receiver.getData (/home/aschen/projets/kuzzleio/sdk-javascript/node_modules/ws/lib/receiver.js:366:17)
    at Receiver.startLoop (/home/aschen/projets/kuzzleio/sdk-javascript/node_modules/ws/lib/receiver.js:142:22) {
  status: 404,
  backendStack: 'NotFoundError: API controller "tsts" not found.\n' +
    '[...Kuzzle internal calls deleted...]\n' +
    '    at Funnel.getController (/home/aschen/projets/kuzzleio/kuzzle/lib/api/funnel.js:586:24)\n' +
    '    at Funnel.processRequest (/home/aschen/projets/kuzzleio/kuzzle/lib/api/funnel.js:400:29)\n' +
    '    at /home/aschen/projets/kuzzleio/kuzzle/lib/api/funnel.js:282:23',
  id: 'api.process.controller_not_found',
  code: 33685508
}