logging.js

const LOG_TAG = '[Login]: ';
  const start = process.hrtime();
 
  const timeTaken = (start) => {
      if (!start) {
          return '';
      }
      const precision = 3; // 3 decimal places
      const elapsed = process.hrtime(start)[1] / 1000000; // divide by a million to get nano to milli
      return elapsed.toFixed(precision);
  };
 
  const sumoEndpoint = configuration.SUMO_COLLECTOR_ENDPOINT;
  const logLevel = parseInt(configuration.DB_LOG_LEVEL, 10) || 0;
  var sLogger = undefined;
  if (sumoEndpoint) {
      const SumoLogger = require('sumo-logger');
      const hostName = configuration.HOST_NAME;
      const options = {
          raw: true,
          endpoint: sumoEndpoint,
          sourceName: 'Auth0',
          sourceCategory: 'auth0-db-scripts-logs',
          interval: 9000,
          hostName,
      };
      sLogger = new SumoLogger(options);
  }
 
  const sLog = (logType, ...text) => {
      const formattedLog = text.reduce((acc, value) => {
          return acc + ((typeof value === 'object') ? JSON.stringify(value) : value);
      });
      if (sumoEndpoint) {
          return sLogger.log('Time:' + new Date().getTime() + ' [' + logType + '] ' + formattedLog);
      } else {
          return console.log('Time:' + new Date().getTime() + ' [' + logType + '] ' + formattedLog);
      }
  };
  const sumoLog = {
      error: (...logs) => { logLevel >= 1 ? sLog('ERROR', ...logs) : ''; },
      info: (...logs) => {  logLevel >= 2 ? sLog('INFO', ...logs) : ''; }
  };
 
  const flushLogs = () => {
      if (sLogger) {
          return sLogger.flushLogs();
      }  else {
          return true;
      }
  };
 
  sumoLog.info(LOG_TAG, `${email} : entry - ${timeTaken(start)}ms`);
  sumoLog.info(LOG_TAG, `${email}, ${auth0User.user_id}: exit - user successfully migrated, ${timeTaken(start)}ms`);
  flushLogs();