uk-petition-poller/lib/petition-tracker.js

Tool to monitor the number of signatures on a UK Government petition

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _requestPromise = _interopRequireDefault(require("request-promise"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

class PetitionTracker {
  constructor() {
    this.events = {};
    this.lastSignatureCount = 0;
    this.lastSuccessfulUpdate = null;
    this.lastUpdateSuccessful = null;
  }

  on(eventKey, eventFn) {
    this.events[eventKey] = eventFn;
  }

  pollerFunction() {
    (0, _requestPromise.default)(`https://petition.parliament.uk/petitions/${this.petitionCode}/count.json`).then(jsonString => {
      const json = JSON.parse(jsonString);
      this.lastSignatureCount = json['signature_count'];
      this.lastSuccessfulUpdate = Date.now();
      this.lastUpdateSuccessful = true;
      this.callOn('change', {
        signature_count: json['signature_count'],
        last_successful_update: this.lastSuccessfulUpdate,
        last_call_ok: this.lastUpdateSuccessful
      });
    }).catch(() => {
      this.lastUpdateSuccessful = false;
      return this.callOn('change', {
        signature_count: this.lastSignatureCount,
        last_successful_update: this.lastSuccessfulUpdate,
        last_call_ok: this.lastUpdateSuccessful
      });
    });
  }

  async start(petitionCode) {
    this.petitionCode = petitionCode;
    await this.pollerFunction();
    setInterval(this.pollerFunction.bind(this), 60000);
  }

  callOn(eventKey, data) {
    const callback = this.events[eventKey];

    if (callback) {
      callback(data);
    }
  }

}

var _default = PetitionTracker;
exports.default = _default;
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