xcraft-core-eventstore/index.js

Xcraft event store

'use strict';

var moduleName = 'eventstore';
var xLog = require('xcraft-core-log')(moduleName, null);
var busConfig = require('xcraft-core-etc')().load('xcraft-core-bus');
var EventStore = require('./lib/eventstore.js');
var axon = require('xcraft-axon');
var subscriptions = axon.socket('sub');
var es;

var persist = function (topic, msg) {
  if (es) {
    /* Note about EventStore and 'connected' topic */
    /* we discard connected message for two reason: */
    /* 1. eventstore don't support field name containing '.' */
    /* 2. this topic annonce all commands, and has no business value */
    if (msg && topic !== 'greathall::autoconnect.finished') {
      es.insert(msg.token, topic, msg.data, function (err) {
        if (err) {
          xLog.err(err);
        }
      });
    } else {
      es.insert(msg.token, topic, null, function (err) {
        if (err) {
          xLog.err(err);
        }
      });
    }
  } else {
    xLog.err('not ready to persist');
  }
};

subscriptions.subscribe('*');
subscriptions.on('message', function (topic, msg) {
  if (topic !== 'greathall::heartbeat') {
    persist(topic, msg);
    if (topic === 'gameover') {
      subscriptions.close();
    }
  }
});

exports.getInstance = function () {
  var config = require('xcraft-core-etc')().load('xcraft-core-eventstore');

  if (!config || !config.enable || es) {
    return es;
  }

  es = new EventStore(config);
  subscriptions.connect(parseInt(busConfig.notifierPort), busConfig.host);
  return es;
};