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transport.js
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transport.js
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/*
* 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.raw = options.raw || false;
this.decycle = options.decycle || 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 () { });
};