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Viewing file:     profiler.js (1.39 KB)      -rw-r--r--

/**
 * profiler.js: TODO: add file header description.
 *
 * (C) 2010 Charlie Robbins
 * MIT LICENCE
 */

'use strict';
/**
 * TODO: add class description.
 * @type {Profiler}
 * @private
 */
class Profiler {
  /**
   * Constructor function for the Profiler instance used by
   * `Logger.prototype.startTimer`. When done is called the timer will finish
   * and log the duration.
   * @param {!Logger} logger - TODO: add param description.
   * @private
   */
  constructor(logger) {
    const Logger = require('./logger');
    if (typeof logger !== 'object' || Array.isArray(logger) || !(logger instanceof Logger)) {
      throw new Error('Logger is required for profiling');
    } else {
      this.logger = logger;
      this.start = Date.now();
    }
  }

  /**
   * Ends the current timer (i.e. Profiler) instance and logs the `msg` along
   * with the duration since creation.
   * @returns {mixed} - TODO: add return description.
   * @private
   */
  done(...args) {
    if (typeof args[args.length - 1] === 'function') {
      // eslint-disable-next-line no-console
      console.warn('Callback function no longer supported as of winston@3.0.0');
      args.pop();
    }

    const info = typeof args[args.length - 1] === 'object' ? args.pop() : {};
    info.level = info.level || 'info';
    info.durationMs = (Date.now()) - this.start;

    return this.logger.write(info);
  }
};

module.exports = Profiler;