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// Copyright 2010 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview This class sends logging messages over a message channel to a
* server on the main page that prints them using standard logging mechanisms.
*
*/
goog.provide('goog.messaging.LoggerClient');
goog.require('goog.Disposable');
goog.require('goog.debug');
goog.require('goog.debug.LogManager');
goog.require('goog.debug.Logger');
/**
* Creates a logger client that sends messages along a message channel for the
* remote end to log. The remote end of the channel should use a
* {goog.messaging.LoggerServer} with the same service name.
*
* @param {!goog.messaging.MessageChannel} channel The channel that on which to
* send the log messages.
* @param {string} serviceName The name of the logging service to use.
* @constructor
* @extends {goog.Disposable}
* @final
*/
goog.messaging.LoggerClient = function(channel, serviceName) {
if (goog.messaging.LoggerClient.instance_) {
return goog.messaging.LoggerClient.instance_;
}
goog.messaging.LoggerClient.base(this, 'constructor');
/**
* The channel on which to send the log messages.
* @type {!goog.messaging.MessageChannel}
* @private
*/
this.channel_ = channel;
/**
* The name of the logging service to use.
* @type {string}
* @private
*/
this.serviceName_ = serviceName;
/**
* The bound handler function for handling log messages. This is kept in a
* variable so that it can be deregistered when the logger client is disposed.
* @type {Function}
* @private
*/
this.publishHandler_ = goog.bind(this.sendLog_, this);
goog.debug.LogManager.getRoot().addHandler(this.publishHandler_);
goog.messaging.LoggerClient.instance_ = this;
};
goog.inherits(goog.messaging.LoggerClient, goog.Disposable);
/**
* The singleton instance, if any.
* @type {goog.messaging.LoggerClient}
* @private
*/
goog.messaging.LoggerClient.instance_ = null;
/**
* Sends a log message through the channel.
* @param {!goog.debug.LogRecord} logRecord The log message.
* @private
*/
goog.messaging.LoggerClient.prototype.sendLog_ = function(logRecord) {
var name = logRecord.getLoggerName();
var level = logRecord.getLevel();
var msg = logRecord.getMessage();
var originalException = logRecord.getException();
var exception;
if (originalException) {
var normalizedException =
goog.debug.normalizeErrorObject(originalException);
exception = {
'name': normalizedException.name,
'message': normalizedException.message,
'lineNumber': normalizedException.lineNumber,
'fileName': normalizedException.fileName,
// Normalized exceptions without a stack have 'stack' set to 'Not
// available', so we check for the existence of 'stack' on the original
// exception instead.
'stack': originalException.stack ||
goog.debug.getStacktrace(goog.debug.Logger.prototype.log)
};
if (goog.isObject(originalException)) {
// Add messageN to the exception in case it was added using
// goog.debug.enhanceError.
for (var i = 0; 'message' + i in originalException; i++) {
exception['message' + i] = String(originalException['message' + i]);
}
}
}
this.channel_.send(this.serviceName_, {
'name': name,
'level': level.value,
'message': msg,
'exception': exception
});
};
/** @override */
goog.messaging.LoggerClient.prototype.disposeInternal = function() {
goog.messaging.LoggerClient.base(this, 'disposeInternal');
goog.debug.LogManager.getRoot().removeHandler(this.publishHandler_);
delete this.channel_;
goog.messaging.LoggerClient.instance_ = null;
};
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