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  * @memberof Loggers
  10  * @class Console
  11  */
  12 module.exports = class ConsoleLogger {
  13   constructor(config) {
  14
  15     /**
  16      * The console it will write to, can be any object that looks
  17      * and acts like a console, including other cologne objects.
  18      *
  19      * @name console
  20      * @instance
  21      * @memberof Loggers.Console
  22      * @type Object
  23      * @default global.console
  24      */
  25     this.console = console;
  26
  27     /**
  28      * The formatter it will use to output the log. If not present it
  29      * will output raw JSON
  30      *
  31      * @name formatter
  32      * @instance
  33      * @memberof Loggers.Console
  34      * @type IFormatter
  35      * @default null
  36      */
  37     this.formatter = null;
  38
  39     Object.assign(this, config);
  40   }
  41
  42
  43   /**
  44    * Main entry point, for each incoming argument it will attempt to
  45    * format and send to the console.
  46    *
  47    * @function log
  48    * @instance
  49    * @memberof Loggers.Console
  50    * @return {undefined}
  51    */
  52   log(...logs) {
  53
  54     const formattedLogs = logs.map((log) => ({ log: this._format(log), level: log._level }));
  55
  56     for (const { log, level } of formattedLogs) {
  57       this._log(log, level );
  58     }
  59
  60   }
  61
  62   // Routes an individual log to the appropriatet console
  63
  64   _log(log, level) {
  65
  66     switch (level) {
  67     case 0:
  68     case 1:
  69     case 2:
  70     case 3:
  71       this.console.error(log);
  72       break;
  73     case 4:
  74       this.console.warn(log);
  75       break;
  76     case 5:
  77     case 6:
  78       this.console.info(log);
  79       break;
  80     case 7:
  81     default:
  82       this.console.log(log);
  83       break;
  84     }
  85   }
  86
  87   _format(logObject) {
  88
  89     if (this.formatter) {
  90       return this.formatter.format(logObject);
  91     }
  92
  93     return Utilities.stringify(logObject);
  94   }
  95 };