// @flow
import { SubscriptionServer } from 'subscriptions-transport-ws';
import { execute, subscribe } from 'graphql';

import schema from '../schema';

/**
 * Create a subscription server based on an exisiting express.js server
 */
const createSubscriptionsServer = (server: any, path: string) => {
  // Start subscriptions server
  return SubscriptionServer.create(
    {
      execute,
      subscribe,
      schema,
      keepAlive: 10000,
    },
    {
      server,
      path,
    }
  );
};

export default createSubscriptionsServer;