gatsby-source-rss-cat/dir/feed-retrieval.js

this is a source plugin for gatsby to reed rss and provide them in categories

var request = require("request");

var FeedParser = require("feedparser");

require("core-js/es6/promise");

function FeedRetrieval(opts) {
  this.resolve(opts);
}

FeedRetrieval.prototype.resolve = function (opts) {
  opts = opts || {};
  this.url = opts.url || "";
  this.platform = opts.platform || "";
};

FeedRetrieval.prototype.request = function (opts) {
  this.resolve(opts);

  var _this = this;

  console.log(this.url);
  console.log('use a promise');
  return new Promise(function (resolve, reject) {
    _this._request(resolve, reject);
  });
};

FeedRetrieval.prototype._request = function (callback, onError) {
  var items = [],
      _this = this;

  request(this.url).on('error', onError).pipe(new FeedParser()).on('error', onError).on('readable', function () {
    var stream = this,
        item;

    while (item = stream.read()) {
      item.platform = _this.platform;
      items.push(item, _this.platform);
    }
  }).on('finish', function () {
    callback(items);
  });
};

module.exports = FeedRetrieval;