Fitbit Ionic fetch abstraction (only supports JSON in this state)

app@polyfills@fetch.js

// FILENAME: app/polyfills/fetch.js

import Promise from './promise';
import * as messaging from "messaging";

const OPEN = messaging.peerSocket.OPEN;

// Helpful to check whether we are connected or not.
// setInterval(() => {
//   const readyState = messaging.peerSocket.readyState;
//   console.log(`App running - Connectivity status=${readyState} 
//     Connected? ${readyState === OPEN ? 'YES' : 'no'}`);
// }, 3000);

// Listen for the onerror event
messaging.peerSocket.onerror = function(err) {
  // Handle any errors
  console.log("Connection error: " + err.code + " - " + err.message);
}

let guid = 0;
const promises = {};
const queue = [];

function send(data) {
  if (messaging.peerSocket.readyState === messaging.peerSocket.OPEN) {
    messaging.peerSocket.send(data);
  } else {
    queue.push(data);
  }
}

messaging.peerSocket.onopen = () => {
  // give it a moment
  setTimeout(() => {
    for (let i = 0; i < queue.length; i++) {
      send(queue[i]);
    }

    queue.length = 0; // ditch memory    
  }, 100);
}

export const fetch = url => {
  return new Promise((resolve, reject) => {
    guid++;
    
    promises[guid] = {
      resolve, reject, url
    };
    send({ url, guid });
  });  
}


// Listen for the onmessage event
messaging.peerSocket.onmessage = event => {
  // Output the message to the console
  const { guid, url, json } = event.data;
  promises[guid].resolve(json);
}

app@polyfills@promise.js

// FILENAME: app/polyfills/promise.js

const global = {};

!function(e){function n(){}function t(e,n){return function(){e.apply(n,arguments)}}function o(e){if("object"!=typeof this)throw new TypeError("Promises must be constructed via new");if("function"!=typeof e)throw new TypeError("not a function");this._state=0,this._handled=!1,this._value=void 0,this._deferreds=[],s(e,this)}function i(e,n){for(;3===e._state;)e=e._value;return 0===e._state?void e._deferreds.push(n):(e._handled=!0,void o._immediateFn(function(){var t=1===e._state?n.onFulfilled:n.onRejected;if(null===t)return void(1===e._state?r:u)(n.promise,e._value);var o;try{o=t(e._value)}catch(i){return void u(n.promise,i)}r(n.promise,o)}))}function r(e,n){try{if(n===e)throw new TypeError("A promise cannot be resolved with itself.");if(n&&("object"==typeof n||"function"==typeof n)){var i=n.then;if(n instanceof o)return e._state=3,e._value=n,void f(e);if("function"==typeof i)return void s(t(i,n),e)}e._state=1,e._value=n,f(e)}catch(r){u(e,r)}}function u(e,n){e._state=2,e._value=n,f(e)}function f(e){2===e._state&&0===e._deferreds.length&&o._immediateFn(function(){e._handled||o._unhandledRejectionFn(e._value)});for(var n=0,t=e._deferreds.length;n<t;n++)i(e,e._deferreds[n]);e._deferreds=null}function c(e,n,t){this.onFulfilled="function"==typeof e?e:null,this.onRejected="function"==typeof n?n:null,this.promise=t}function s(e,n){var t=!1;try{e(function(e){t||(t=!0,r(n,e))},function(e){t||(t=!0,u(n,e))})}catch(o){if(t)return;t=!0,u(n,o)}}var a=setTimeout;o.prototype["catch"]=function(e){return this.then(null,e)},o.prototype.then=function(e,t){var o=new this.constructor(n);return i(this,new c(e,t,o)),o},o.all=function(e){var n=Array.prototype.slice.call(e);return new o(function(e,t){function o(r,u){try{if(u&&("object"==typeof u||"function"==typeof u)){var f=u.then;if("function"==typeof f)return void f.call(u,function(e){o(r,e)},t)}n[r]=u,0===--i&&e(n)}catch(c){t(c)}}if(0===n.length)return e([]);for(var i=n.length,r=0;r<n.length;r++)o(r,n[r])})},o.resolve=function(e){return e&&"object"==typeof e&&e.constructor===o?e:new o(function(n){n(e)})},o.reject=function(e){return new o(function(n,t){t(e)})},o.race=function(e){return new o(function(n,t){for(var o=0,i=e.length;o<i;o++)e[o].then(n,t)})},o._immediateFn="function"==typeof setImmediate&&function(e){setImmediate(e)}||function(e){a(e,0)},o._unhandledRejectionFn=function(e){"undefined"!=typeof console&&console&&console.warn("Possible Unhandled Promise Rejection:",e)},o._setImmediateFn=function(e){o._immediateFn=e},o._setUnhandledRejectionFn=function(e){o._unhandledRejectionFn=e},"undefined"!=typeof module&&module.exports?module.exports=o:e.Promise||(e.Promise=o)}(global);

export default global.Promise;

companion@index.js

// FILENAME: companion/index.js

import * as messaging from "messaging";

messaging.peerSocket.onmessage = event => {
  const { url, guid } = event.data;
  fetch(url).then(res => res.json()).then(json => {    
    messaging.peerSocket.send({ url, guid, json });
  }).catch(e => console.log(e));
}