git.r.bdr.sh - rbdr/cologne/blob - lib/formatters/simple.js

   1 'use strict';
   2
   3 const Utilities = require('../utilities');
   4
   5 /**
   6  * Simple formatter. Outputs a predefined format:
   7  * `[{{_timestamp}}][{{_levelString}}] {{_from}}: {{message}}`;
   8  *
   9  * @memberof Formatters
  10  * @implements IFormatter
  11  * @class Simple
  12  */
  13 module.exports = class SimpleFormatter {
  14
  15   constructor(config) {
  16
  17     /**
  18      * Flag that tells us whether or not to use ANSI color. Defaults to
  19      * false.
  20      *
  21      * @name colorize
  22      * @instance
  23      * @memberof Formatters.Simple
  24      * @type Boolean
  25      * @default false
  26      */
  27     this.colorize = false;
  28
  29     Object.assign(this, config || {});
  30   }
  31
  32   /**
  33    * Main entry point, it will read the incoming log object and convert
  34    * it to the output string.
  35    *
  36    * @function format
  37    * @instance
  38    * @memberof Formatters.Simple
  39    * @param {tCologneLog} logObjet the log to format
  40    * @return {String} the formatted object
  41    */
  42   format(logObject) {
  43
  44     const date = (new Date(Number(logObject._timestamp) / 1000000)).toISOString();
  45     const levelString = this._colorize(logObject._levelString, logObject._level);
  46
  47     return `[${date}][${levelString}] ${logObject._from}: ${logObject.message}`;
  48   }
  49
  50   _colorize(levelString, level) {
  51
  52     if (!this.colorize) {
  53       return levelString;
  54     }
  55
  56     const escapeCode = String.fromCharCode(27);
  57     const color = escapeCode + Utilities.getAnsiCode(Utilities.getLevelAnsi(level));
  58     const reset = escapeCode + Utilities.getAnsiCode('reset');
  59
  60     return color + levelString + reset;
  61   }
  62 };