connect-to-server.js

  connectToServer(host) {
    // connect to the deepstream server
    return new Promise((resolve, reject) => {
      setTimeout(() => {
        reject('timeout');
      }, 2000);
      this.client = deepstream(host, {
        mergeStrategy: deepstream.MERGE_STRATEGIES.REMOTE_WINS,
      });
      this.client.login();
      this.client.on('error', e => {
        reject(e);
      });
      this.client.on('connectionStateChanged', e => {
        if (e === deepstream.CONSTANTS.CONNECTION_STATE.OPEN) {
          resolve();
        }
        if (e === deepstream.CONSTANTS.CONNECTION_STATE.ERROR) {
          reject('error');
        }
      });
    });
  }