libpiggy/lib/watch-table.js

Use a PostgreSQL database like a JSON document store.

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _qs = require('qs');

var _qs2 = _interopRequireDefault(_qs);

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

const isTrigger = function ({ table, when, parsed }) {
  if (parsed.table !== table) {
    return false;
  }

  if (!when) {
    return true;
  }

  if (parsed.when === when) {
    return true;
  }

  return false;
};

const watchTable = function ({ client, table, when, watcher, store }) {
  client = client || store.client;

  try {
    client.on('notification', ({ channel, payload }) => {
      const parsed = _qs2.default.parse(payload);
      const trigger = isTrigger({ table, when, parsed });
      if (trigger) {
        watcher({ client, channel, payload, parsed });
      }
    });
    return { client };
  } catch (error) {
    throw error;
  }
};

exports.default = watchTable;