Function extend

lib/client-options.js:113–174

* Extends and validates the user options * @param {Object} [baseOptions] The source object instance that will be overridden * @param {Object} userOptions * @returns {Object}

(baseOptions, userOptions)

 * @returns {Object}
 */
function extend(baseOptions, userOptions) {
  if (arguments.length === 1) {
    userOptions = arguments[0];
    baseOptions = {};
  }
  const options = utils.deepExtend(baseOptions, defaultOptions(), userOptions);

  if (!options.cloud) {
    if (!Array.isArray(options.contactPoints) || options.contactPoints.length === 0) {
      throw new TypeError('Contacts points are not defined.');
    }

    for (let i = 0; i < options.contactPoints.length; i++) {
      const hostName = options.contactPoints[i];
      if (!hostName) {
        throw new TypeError(util.format('Contact point %s (%s) is not a valid host name, ' +
          'the following values are valid contact points: ipAddress, hostName or ipAddress:port', i, hostName));
      }
    }

    options.sni = undefined;
  } else {
    validateCloudOptions(options);
  }

  if (!options.logEmitter) {
    options.logEmitter = function () {};
  }
  if (!options.queryOptions) {
    throw new TypeError('queryOptions not defined in options');
  }

  if (options.requestTracker !== null && !(options.requestTracker instanceof tracker.RequestTracker)) {
    throw new TypeError('requestTracker must be an instance of RequestTracker');
  }

  if (!(options.metrics instanceof metrics.ClientMetrics)) {
    throw new TypeError('metrics must be an instance of ClientMetrics');
  }

  validatePoliciesOptions(options.policies);

  validateProtocolOptions(options.protocolOptions);

  validateSocketOptions(options.socketOptions);

  validateAuthenticationOptions(options);

  options.encoding = options.encoding || {};

  validateEncodingOptions(options.encoding);

  if (options.profiles && !Array.isArray(options.profiles)) {
    throw new TypeError('profiles must be an Array of ExecutionProfile instances');
  }

  validateApplicationInfo(options);