server.js

import ChainApi from "./lib/ChainApi";
import Work from "./lib/Work";
import {
  ChainStore
} from 'yoyowjs-lib';

/**
 * Module dependencies.
 */

var app = require('./app');
var debug = require('debug')('yoyow-resource:server');
var http = require('http');

/**
 * Get port from environment and store in Express.
 */

var port = normalizePort(process.env.PORT || '3000');
app.set('port', port);

/**
 * Create HTTP server.
 */

var server = http.createServer(app);

/**
 * Listen on provided port, on all network interfaces.
 */
ChainApi.apiInstance();


let initInterval=setInterval(() => {
  ChainStore.init();

  ChainApi.getAssetsByUid();;
}, 60000);


let blockInterval=setInterval(() => {
  Work.GetLastBlockNum();
}, 3000);

server.listen(port);
server.on('error', onError);
server.on('listening', onListening);

/**
 * Normalize a port into a number, string, or false.
 */

function normalizePort(val) {
  var port = parseInt(val, 10);

  if (isNaN(port)) {
    // named pipe
    return val;
  }

  if (port >= 0) {
    // port number
    return port;
  }

  return false;
}

/**
 * Event listener for HTTP server "error" event.
 */

function onError(error) {
  if (error.syscall !== 'listen') {
    throw error;
  }

  if(initInterval){
    clearInterval(initInterval);
  }

  if(blockInterval){
    clearInterval(blockInterval);
  }

  var bind = typeof port === 'string' ?
    'Pipe ' + port :
    'Port ' + port;

  // handle specific listen errors with friendly messages
  switch (error.code) {
    case 'EACCES':
      console.error(bind + ' requires elevated privileges');
      process.exit(1);
      break;
    case 'EADDRINUSE':
      console.error(bind + ' is already in use');
      process.exit(1);
      break;
    default:
      throw error;
  }
}

/**
 * Event listener for HTTP server "listening" event.
 */

function onListening() {
  var addr = server.address();
  var bind = typeof addr === 'string' ?
    'pipe ' + addr :
    'port ' + addr.port;
  debug('Listening on ' + bind);
}