waigo/src/support/startup/notifications.js

Node.js ES6 framework for reactive, data-driven apps and APIs (Koa, RethinkDB)

"use strict";

const co = require('co');

const waigo = global.waigo,
  _ = waigo._;




/**
 * Setup notification mechanisms.
 *
 * Upon completion:
 * 
 * `App.emit('notify')` will trigger a notification.
 * 
 * @param {Object} App The application.
 */
module.exports = function*(App) {
  App.logger.info(`Setting up notifications`);

  let ids = _.keys(App.config.notifications || {});

  App.notifiers = {};

  for (let id of ids) {
    App.logger.debug(`Setting up notifier: ${id}`);

    let cfg = App.config.notifications[id];

    let transports = yield _.map(cfg.transports || [], function*(transport) {
      App.logger.debug(`Setting up transport: ${transport.type}`);

      let builder = waigo.load(`support/notifications/${transport.type}`);

      return yield builder(App, id, transport.config);
    });

    App.notifiers[id] = {
      transports: transports,
    };
  }

  App.on('notify', co.wrap(function*(id, messageOrObject) {
    if (!App.notifiers[id]) {
      return App.logger.warn(`Skipping invalid notifier target: ${id}`);
    }

    App.logger.debug(`Notify ${id}`);

    yield _.map(App.notifiers[id].transports, (t) => {
      return t(messageOrObject);
    });
  }));
};