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

   1 'use strict';
   2
   3 let LogUtilities = require('../log_utilities');
   4
   5 /**
   6  * Logger for the javascript console.
   7  *
   8  * @memberof Cologne.Logger
   9  * @implements Cologne.ILogger
  10  * @class Console
  11  */
  12 let ConsoleLogger = 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 Cologne.Logger.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 Cologne.Logger.Console
  34      * @type Cologne.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 Cologne.Logger.Console
  50    * @return {undefined}
  51    */
  52   log () {
  53     let logObject, messages, severity;
  54
  55     messages = [];
  56
  57     for (logObject of arguments) {
  58       messages.push(this._format(logObject));
  59
  60       if (!severity) {
  61         severity = logObject._level;
  62       }
  63     }
  64
  65     switch(severity) {
  66     case 0:
  67     case 1:
  68     case 2:
  69     case 3:
  70       this.console.error.apply(this.console, messages);
  71       break;
  72     case 4:
  73       this.console.warn.apply(this.console, messages);
  74       break;
  75     case 5:
  76     case 6:
  77       this.console.info.apply(this.console, messages);
  78       break;
  79     case 7:
  80     default:
  81       this.console.log.apply(this.console, messages);
  82       break;
  83     }
  84   }
  85
  86   _format (logObject) {
  87     if (this.formatter) {
  88       return this.formatter.format(logObject);
  89     }
  90
  91     return LogUtilities.stringify(logObject);
  92   }
  93 };
  94
  95 module.exports = ConsoleLogger;