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Viewing file:     configuration.js (2.91 KB)      -rw-r--r--

var AWS = require('../core');

/**
 * Resolve client-side monitoring configuration from either environmental variables
 * or shared config file. Configurations from environmental variables have higher priority
 * than those from shared config file. The resolver will try to read the shared config file
 * no matter whether the AWS_SDK_LOAD_CONFIG variable is set.
 * @api private
 */
function resolveMonitoringConfig() {
  var config = {
    port: undefined,
    clientId: undefined,
    enabled: undefined,
    host: undefined
  };
  if (fromEnvironment(config) || fromConfigFile(config)) return toJSType(config);
  return toJSType(config);
}

/**
 * Resolve configurations from environmental variables.
 * @param {object} client side monitoring config object needs to be resolved
 * @returns {boolean} whether resolving configurations is done
 * @api private
 */
function fromEnvironment(config) {
  config.port = config.port || process.env.AWS_CSM_PORT;
  config.enabled = config.enabled || process.env.AWS_CSM_ENABLED;
  config.clientId = config.clientId || process.env.AWS_CSM_CLIENT_ID;
  config.host = config.host || process.env.AWS_CSM_HOST;
  return config.port && config.enabled && config.clientId && config.host ||
    ['false', '0'].indexOf(config.enabled) >= 0; //no need to read shared config file if explicitely disabled
}

/**
 * Resolve cofigurations from shared config file with specified role name
 * @param {object} client side monitoring config object needs to be resolved
 * @returns {boolean} whether resolving configurations is done
 * @api private
 */
function fromConfigFile(config) {
  var sharedFileConfig;
  try {
    var configFile = AWS.util.iniLoader.loadFrom({
      isConfig: true,
      filename: process.env[AWS.util.sharedConfigFileEnv]
    });
    var sharedFileConfig = configFile[
      process.env.AWS_PROFILE || AWS.util.defaultProfile
    ];
  } catch (err) {
    return false;
  }
  if (!sharedFileConfig) return config;
  config.port = config.port || sharedFileConfig.csm_port;
  config.enabled = config.enabled || sharedFileConfig.csm_enabled;
  config.clientId = config.clientId || sharedFileConfig.csm_client_id;
  config.host = config.host || sharedFileConfig.csm_host;
  return config.port && config.enabled && config.clientId && config.host;
}

/**
 * Transfer the resolved configuration value to proper types: port as number, enabled
 * as boolean and clientId as string. The 'enabled' flag is valued to false when set
 * to 'false' or '0'.
 * @param {object} resolved client side monitoring config
 * @api private
 */
function toJSType(config) {
    //config.XXX is either undefined or string
  var falsyNotations = ['false', '0', undefined];
  if (!config.enabled || falsyNotations.indexOf(config.enabled.toLowerCase()) >= 0) {
    config.enabled = false;
  } else {
    config.enabled = true;
  }
  config.port = config.port ? parseInt(config.port, 10) : undefined;
  return config;
}

module.exports = resolveMonitoringConfig;