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trail.js
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trail.js
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Trail = {};
Trail.Util = {
formatTimestamp: 'TODO'
};
Trail.Origin = {
type: Meteor.isClient ? 'client' : 'server',
id: (new Date()).getTime() + '_' + ('' + Math.random()).slice(2)
};
Trail.LOG_LEVELS = {
'FATAL': 1,
'ERROR': 2,
'WARN': 3,
'INFO': 4,
'DEBUG': 5
};
Trail.isLogLevelLowerOrEqual = function(x, y) {
var logLevelX = Trail.LOG_LEVELS[('' + x).toUpperCase()];
var logLevelY = Trail.LOG_LEVELS[('' + y).toUpperCase()];
return logLevelX == null || logLevelY == null || logLevelX <= logLevelY;
};
Trail.setDefaultMetaData = function(meta) {
meta = typeof meta === 'object' ? meta : {};
meta._origin = meta._origin || Trail.Origin.type;
meta._origin_id = meta._origin_id || Trail.Origin.id;
return meta;
};
Trail.Transport = (function() {
// Constructor:
function Transport(setupFunc, logFunc, typeName, options) {
this._impl = {
options: options
};
this._setupFunc = setupFunc;
this._logFunc = logFunc;
this._type = typeName;
this._options = {
level: options.level
};
this._setup();
}
// Setup the transport:
Transport.prototype._setup = function() {
if (typeof this._setupFunc === 'function') {
this._setupFunc.call(this._impl);
}
};
// Log a message:
Transport.prototype.log = function(timestamp, level, message, meta) {
if (Trail.isLogLevelLowerOrEqual(level, this._options.level)) {
this._logFunc.call(this._impl, timestamp, level, message, meta);
}
};
// Return the type name:
Transport.prototype.getType = function() {
return this._type;
};
return Transport;
})();
Trail.TransportManager = (function() {
// Constructor:
function TransportManager() {
this._transportTypes = {};
this._loggers = [];
}
// Register a logger for new-transport-type events:
// TODO? Use an actual event mechanism.
TransportManager.prototype.registerLogger = function(logger) {
this._loggers.push(logger);
};
// Emit the new-transport-type event:
// TODO? Use an actual event mechanism.
TransportManager.prototype._emitNewTransportTypeEvent = function(transportTypeName) {
for (var i = 0; i < this._loggers.length; ++i) {
var logger = this._loggers[i];
logger.newTransportType(transportTypeName);
}
};
// Add transport type:
TransportManager.prototype.addTransportType = function(name, setupFunc, logFunc) {
this._transportTypes[name] = {
setupFunc: setupFunc,
logFunc: logFunc
};
this._emitNewTransportTypeEvent(name);
};
// Check whether transport type is available:
TransportManager.prototype.isTransportTypeAvailable = function(name) {
return typeof this._transportTypes[name] !== 'undefined';
};
// Create transport instance:
TransportManager.prototype.createTransport = function(name, options) {
if (!this.isTransportTypeAvailable(name)) {
return null;
}
var transportType = this._transportTypes[name];
return new Trail.Transport(transportType.setupFunc, transportType.logFunc, name, options);
};
return TransportManager;
})();
Trail.Logger = (function() {
// Constructor:
function Logger(transportManager) {
this._transportManager = transportManager;
this._transportManager.registerLogger(this);
this._transportDescriptions = {};
this._transports = [];
}
// Instantiate transports for the descriptions for this type:
Logger.prototype._instantiateTransports = function(name) {
var descriptionsByName = this._transportDescriptions[name];
if (typeof descriptionsByName !== 'undefined' && this._transportManager.isTransportTypeAvailable(name)) {
for (var i = 0; i < descriptionsByName.length; ++i) {
var options = descriptionsByName[i];
var transport = this._transportManager.createTransport(name, options);
this._transports.push(transport);
}
descriptionsByName.splice(0, descriptionsByName.length); // Clear the array.
}
};
// Add a transport:
Logger.prototype.addTransport = function(name, options) {
var descriptionsByName = this._transportDescriptions[name];
if (typeof descriptionsByName === 'undefined') {
descriptionsByName = [];
this._transportDescriptions[name] = descriptionsByName;
}
descriptionsByName.push(options);
this._instantiateTransports(name);
};
// Handler for new-transport-type events:
Logger.prototype.newTransportType = function(name) {
this._instantiateTransports(name);
};
// Log a message:
Logger.prototype.logMessage = function(level, message, meta) {
var timestamp = (new Date()).getTime(); // TODO: Create a timezone-independent server-synced timestamp.
meta = Trail.setDefaultMetaData(meta);
for (var i = 0; i < this._transports.length; ++i) {
var transport = this._transports[i];
transport.log(timestamp, level, message, meta);
}
};
// Log messages of different log levels:
Logger.prototype.fatal = function(message, meta) { this.logMessage('FATAL', message, meta); };
Logger.prototype.error = function(message, meta) { this.logMessage('ERROR', message, meta); };
Logger.prototype.warn = function(message, meta) { this.logMessage('WARN', message, meta); };
Logger.prototype.info = function(message, meta) { this.logMessage('INFO', message, meta); };
Logger.prototype.debug = function(message, meta) { this.logMessage('DEBUG', message, meta); };
return Logger;
})();