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/*
* container.js: Inversion of control container for winston logger instances
*
* (C) 2010 Charlie Robbins
* MIT LICENCE
*
*/
var common = require('./common'),
winston = require('../winston'),
extend = require('util')._extend;
//
// ### function Container (options)
// #### @options {Object} Default pass-thru options for Loggers
// Constructor function for the Container object responsible for managing
// a set of `winston.Logger` instances based on string ids.
//
var Container = exports.Container = function (options) {
this.loggers = {};
this.options = options || {};
this.default = {
transports: [
new winston.transports.Console({
level: 'silly',
colorize: false
})
]
}
};
//
// ### function get / add (id, options)
// #### @id {string} Id of the Logger to get
// #### @options {Object} **Optional** Options for the Logger instance
// Retreives a `winston.Logger` instance for the specified `id`. If
// an instance does not exist, one is created.
//
Container.prototype.get = Container.prototype.add = function (id, options) {
var self = this,
existing;
if (!this.loggers[id]) {
//
// Remark: Simple shallow clone for configuration options in case we pass in
// instantiated protoypal objects
//
options = extend({}, options || this.options || this.default);
existing = options.transports || this.options.transports;
//
// Remark: Make sure if we have an array of transports we slice it to make copies
// of those references.
//
options.transports = existing ? existing.slice() : [];
if (options.transports.length === 0 && (!options || !options['console'])) {
options.transports.push(this.default.transports[0]);
}
Object.keys(options).forEach(function (key) {
if (key === 'transports' || key === 'filters' || key === 'rewriters') {
return;
}
var name = common.capitalize(key);
if (!winston.transports[name]) {
throw new Error('Cannot add unknown transport: ' + name);
}
var namedOptions = options[key];
namedOptions.id = id;
options.transports.push(new (winston.transports[name])(namedOptions));
});
options.id = id;
this.loggers[id] = new winston.Logger(options);
this.loggers[id].on('close', function () {
self._delete(id);
});
}
return this.loggers[id];
};
//
// ### function close (id)
// #### @id {string} **Optional** Id of the Logger instance to find
// Returns a boolean value indicating if this instance
// has a logger with the specified `id`.
//
Container.prototype.has = function (id) {
return !!this.loggers[id];
};
//
// ### function close (id)
// #### @id {string} **Optional** Id of the Logger instance to close
// Closes a `Logger` instance with the specified `id` if it exists.
// If no `id` is supplied then all Loggers are closed.
//
Container.prototype.close = function (id) {
var self = this;
function _close (id) {
if (!self.loggers[id]) {
return;
}
self.loggers[id].close();
self._delete(id);
}
return id ? _close(id) : Object.keys(this.loggers).forEach(function (id) {
_close(id);
});
};
//
// ### @private function _delete (id)
// #### @id {string} Id of the Logger instance to delete from container
// Deletes a `Logger` instance with the specified `id`.
//
Container.prototype._delete = function (id) {
delete this.loggers[id];
}