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Migrating from version 1.x

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This document outlines how to update your application from enigma.js version 1.x to version 2.0. The breaking changes are mainly limited to configuration, fetching sessions and package file structure. All generated APIs from enigma.js should work just like in version 1.

Table of contents

Service concept dropped

In enigma.js version 1, there was a concept called "enigma.js services" which was planned to be expanded with different modules supporting communication with a wide range of Qlik back-end services. In enigma.js version 2 this concept has been dropped in an effort to streamline enigma.js for communicating against QIX engine(s).

The enigma.js REST service is no longer available, and we recommend that you use swagger-js to accomplish the same by using a library that is streamlined for generating and providing APIs based on OpenAPI/swagger definitions.

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Schema directory flattened

The enigma.js/schemas directory has been flattened. If you did this in enigma.js version 1:

const schema = require('enigma.js/schemas/qix/3.2/schema.json');

...you would do this in enigma.js version 2:

const schema = require('enigma.js/schemas/3.2.json');

Read more:

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Configuration overhaul

The configuration has been revamped a lot in enigma.js version 2, to make it easier to understand and predict. All configuration properties in config.session has been removed from enigma.js, and can now be supplied into the new SenseUtilities.buildUrl() API if needed.

Read more:

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Entry API changed

Due to the service concept being dropped, the entry API for enigma.js has changed in version 2.

If you used enigma.js like this in version 1:

const enigma = require('enigma.js');
const schema = require('enigma.js/schemas/3.2/schema.json');
const config = {
  host: 'localhost',
  port: 9076,
  appId: '123',
};
enigma.getService('qix', config).then((qix) => {
  // qix.global === QIX global interface
  // qix.app === QIX doc interface
});

It would look like this in enigma.js version 2:

const enigma = require('enigma.js');
// schemas is flattened:
const schema = require('enigma.js/schemas/3.2.json');
// you are now in full control of the websocket URL:
const config = { schema, url: 'ws://localhost:9076/app/123' };
enigma.create(config).open().then((global) => {
  // global === QIX global interface
  global.openDoc('123').then((doc) => {
    // doc === QIX doc interface
  });
});

or if you are using Qlik Sense and want help building the URL:

const enigma = require('enigma.js');
// sense-utilities is a new separate module for generating Sense-compatible URLs:
const SenseUtilities = require('enigma.js/sense-utilities');
// schemas is flattened:
const schema = require('enigma.js/schemas/3.2.json');
// configuration for sense-utilities module:
const urlConfig = { host: 'localhost', port: 9076, appId: '123', secure: false };
// you are now in full control of the websocket URL:
const config = { schema, url: SenseUtilities.buildUrl(urlConfig) };
enigma.create(config).open().then((global) => {
  // global === QIX global interface
  global.openDoc(config.appId).then((doc) => {
    // doc === QIX doc interface
  });
});

Read more:

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Session events

In enigma.js version 1 you could send in a config.listeners object with event handlers for different session events. We had to add this due to the automatic opening of the socket when doing enigma.getService().

In enigma.js version 2 we only open the websocket when you are ready. This allows you to bind all events like you are used to, using .on('event', fn).

If you did this in version 1:

const enigma = require('enigma.js');
const schema = require('enigma.js/schemas/qix/3.2/schema.json');
const config = {
  schema,
  host: 'localhost',
  listeners: {
    'notification:OnAuthenticationInfo': () => {}
  },
};
enigma.getService('qix', config).then((qix) => {
  // qix.global === QIX global interface
});

...you would do this in version 2:

const enigma = require('enigma.js');
const schema = require('enigma.js/schemas/3.2.json');
const config = { schema, url: 'ws://localhost/app/engineData' };
const session = enigma.create(config);
session.on('notification:OnAuthenticationInfo', () => {});
session.open().then((global) => {
  // global === QIX global interface
});

In addition to this, a few events were removed or renamed:

session-created

You may instead use the opened event.

qix-error (never documented)

You may instead look for data.error using the traffic:received event.

Example:

session.on('traffic:received', (data) => {
  if (data.error) {
    // qix error occurred
  }
});

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Session cache and websockets

In enigma.js version 1, we tried to cache enigma.js sessions by storing them using the generated URL as cache key. This caused tricky and hard-to-find bugs in some scenarios and in enigma.js version 2, caching is left to the user of the library. All calls to enigma.create() will create a new enigma.js session (which will result in a new websocket as well).

Example of a URL-based cache:

const sessions = {};

function getSession(url) {
  let session = sessions[url];
  if (!session) {
    session = enigma.create({ schema, url });
    session.on('closed', () => delete sessions[url]);
    sessions[url] = session;
  }
  return session.open();
}

getSession('ws://localhost:9076/app/123').then((global) => {
  // global === QIX global interface
});

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Mixin init(args) changed

The mixin API has been changed slightly to grant the mixin developer access to the enigma.js configuration.

If your mixin looked like this in enigma.js version 1:

const mixin = {
  init: function (args) {
    this.Promise = args.Promise;
  }
};

it would look like this in enigma.js version 2:

const mixin = {
  init: function (args) {
    this.Promise = args.config.Promise;
  }
};

This allows the developer to access all properties sent into enigma.create(). Keep in mind that to avoid potential configuration clashes in the future, use a namespace in the enigma.js configuration for your mixin.

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Trying to fetch non-existing objects

In enigma.js version 1 we never normalized the QIX Engine API in regards to fetching objects, which caused the promise to be resolved with a null value:

doc.getObject('non-existing-id').then((api) => {
  // api === null
  if (api) {
    // run your code using 'api'
  }
});

In version 2, it will be rejected:

doc.getObject('non-existing-id').then((api) => {
  // run your code using 'api' safely
}).catch(err => console.log('Object did not exist'));

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Traffic logging

In enigma.js version 1, you could log websocket traffic by sending in a config.handleLog callback function. In version 2, this callback is replaced with traffic:*-events.

If you did this in version 1:

const enigma = require('enigma.js');
const schema = require('enigma.js/schemas/qix/3.2/schema.json');
const config = {
  schema,
  host: 'localhost',
  handleLog: message => console.log(message),
};
enigma.getService('qix', config).then((qix) => {
  // qix.global === QIX global interface
});

...you would do this in version 2:

const enigma = require('enigma.js');
const schema = require('enigma.js/schemas/3.2.json');
const config = { schema, url: 'ws://localhost/app/engineData' };
const session = enigma.create(config);
session.on('traffic:*', (direction, message) => console.log(direction, message));
session.open().then((global) => {
  // global === QIX global interface
});

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