72 lines
2 KiB
JavaScript
72 lines
2 KiB
JavaScript
'use strict';
|
|
|
|
const got = require('got');
|
|
const uniqueRandomArray = require('unique-random-array');
|
|
const EventEmitter = require('eventemitter3');
|
|
|
|
const randomCache = {};
|
|
|
|
function formatResult(getRandomImage) {
|
|
const imageData = getRandomImage();
|
|
if (!imageData) {
|
|
return;
|
|
}
|
|
return `http://imgur.com/${imageData.hash}${imageData.ext.replace(/\?.*/, '')}`;
|
|
}
|
|
|
|
function storeResults(images, subreddit) {
|
|
const getRandomImage = uniqueRandomArray(images);
|
|
|
|
randomCache[subreddit] = getRandomImage;
|
|
return getRandomImage;
|
|
}
|
|
|
|
function randomPuppy(subreddit) {
|
|
subreddit = (typeof subreddit === 'string' && subreddit.length !== 0) ? subreddit : 'puppies';
|
|
|
|
if (randomCache[subreddit]) {
|
|
return Promise.resolve(formatResult(randomCache[subreddit]));
|
|
}
|
|
|
|
return got(`https://imgur.com/r/${subreddit}/hot.json`, {json: true})
|
|
.then(response => storeResults(response.body.data, subreddit))
|
|
.then(getRandomImage => formatResult(getRandomImage));
|
|
}
|
|
|
|
// silly feature to play with observables
|
|
function all(subreddit) {
|
|
const eventEmitter = new EventEmitter();
|
|
|
|
function emitRandomImage(subreddit) {
|
|
randomPuppy(subreddit).then(imageUrl => {
|
|
eventEmitter.emit('data', imageUrl + '#' + subreddit);
|
|
if (eventEmitter.listeners('data').length) {
|
|
setTimeout(() => emitRandomImage(subreddit), 200);
|
|
}
|
|
});
|
|
}
|
|
|
|
emitRandomImage(subreddit);
|
|
return eventEmitter;
|
|
}
|
|
|
|
function callback(subreddit, cb) {
|
|
randomPuppy(subreddit)
|
|
.then(url => cb(null, url))
|
|
.catch(err => cb(err));
|
|
}
|
|
|
|
// subreddit is optional
|
|
// callback support is provided for a training exercise
|
|
module.exports = (subreddit, cb) => {
|
|
if (typeof cb === 'function') {
|
|
callback(subreddit, cb);
|
|
} else if (typeof subreddit === 'function') {
|
|
callback(null, subreddit);
|
|
} else {
|
|
return randomPuppy(subreddit);
|
|
}
|
|
};
|
|
|
|
module.exports.all = all;
|