git.r.bdr.sh - rbdr/cologne/blob - lib/loggers/console.js

   1 'use strict';
   2
   3 const Utilities = require('../utilities');
   4
   5 /**
   6  * Logger for the javascript console.
   7  *
   8  * @implements ILogger
   9  * @class Console
  10  */
  11 module.exports = class ConsoleLogger {
  12   constructor(config) {
  13
  14     /**
  15      * The console it will write to, can be any object that looks
  16      * and acts like a console, including other cologne objects.
  17      *
  18      * @name console
  19      * @instance
  20      * @memberof Loggers.Console
  21      * @type Object
  22      * @default global.console
  23      */
  24     this.console = console;
  25
  26     /**
  27      * The formatter it will use to output the log. If not present it
  28      * will output raw JSON
  29      *
  30      * @name formatter
  31      * @instance
  32      * @memberof Loggers.Console
  33      * @type IFormatter
  34      * @default null
  35      */
  36     this.formatter = null;
  37
  38     Object.assign(this, config);
  39   }
  40
  41
  42   /**
  43    * Main entry point, for each incoming argument it will attempt to
  44    * format and send to the console.
  45    *
  46    * @function log
  47    * @instance
  48    * @memberof Loggers.Console
  49    * @return {undefined}
  50    */
  51   log(...logs) {
  52
  53     const formattedLogs = logs.map((log) => ({ log: this._format(log), level: log._level }));
  54
  55     for (const { log, level } of formattedLogs) {
  56       this._log(log, level );
  57     }
  58
  59   }
  60
  61   // Routes an individual log to the appropriatet console
  62
  63   _log(log, level) {
  64
  65     switch (level) {
  66     case 0:
  67     case 1:
  68     case 2:
  69     case 3:
  70       this.console.error(log);
  71       break;
  72     case 4:
  73       this.console.warn(log);
  74       break;
  75     case 5:
  76     case 6:
  77       this.console.info(log);
  78       break;
  79     case 7:
  80     default:
  81       this.console.log(log);
  82       break;
  83     }
  84   }
  85
  86   _format(logObject) {
  87
  88     if (this.formatter) {
  89       return this.formatter.format(logObject);
  90     }
  91
  92     return Utilities.stringify(logObject);
  93   }
  94 };