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transport.js 

/*
 * transport.js: Base Transport object for all Winston transports.
 *
 * (C) 2010 Charlie Robbins
 * MIT LICENCE
 *
 */

var events = require('events'),
    util = require('util');

function Transport (options)

@options {Object} Options for this instance.

Constructor function for the Tranport object responsible base functionality for all winston transports.

 
var Transport = exports.Transport = function (options) {
  events.EventEmitter.call(this);
  
  options               = options        || {};  
  this.level            = options.level  || 'info';
  this.silent           = options.silent || false;
  this.handleExceptions = options.handleExceptions || false;
};

Inherit from events.EventEmitter.

 
util.inherits(Transport, events.EventEmitter);

function logException (msg, meta, callback)

@msg {string} Message to log

@meta {Object} Optional Additional metadata to attach

@callback {function} Continuation to respond to when complete.

Logs the specified msg, meta and responds to the callback once the log operation is complete to ensure that the event loop will not exit before all logging has completed.

 
Transport.prototype.logException = function (msg, meta, callback) {
  var self = this;
  
  function onLogged () {
    self.removeListener('error', onError);
    callback();
  }
  
  function onError () {
    self.removeListener('logged', onLogged);
    callback();
  }
  
  this.once('logged', onLogged);
  this.once('error', onError);  
  this.log('error', msg, meta, function () { });
};