Created a Growl Appender

[Eric Zeitler]

Hi, I have created a simple Appender that dumps to the Growl
notification system.
Requires the Growl.Connector and Growl.CoreLibrary from the Growl for
Windows SDK.

GPLv2


/*
GrowlAppender - log4net appender that dumps notification messages to the Growl 
notification system
Copyright (C) 2009  Dimension4, Eric Zeitler

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using Growl.Connector;
using log4net.Appender;
using log4net.Core;

namespace Dimension4
{
    /// <summary>
    /// Provides Growl notifications from log4net events.
    /// 
    /// &lt;appender name="Growl" type="GrowlAppender, GrowlAppender"&gt;
    /// &lt;Password value="***************"/&gt;
    /// &lt;Hostname value="localhost"/&gt;
    /// &lt;Port value="9887"/&gt;
    /// &lt;layout type="log4net.Layout.PatternLayout"&gt;
    /// &lt;conversionPattern value="%5level - %message%newline" /&gt;
    ///  &lt;/layout&gt;
    /// &lt;/appender> 
    /// 
    /// </summary>
    public class GrowlAppender : AppenderSkeleton
    {
        private readonly IDictionary<Level, NotificationType> _levelMap = new 
Dictionary<Level, NotificationType>();
        private readonly Application application;
        private readonly NotificationType GENERAL = new 
NotificationType("GENERAL");
        private readonly GrowlConnector growl;
        private int? _port;

        public GrowlAppender()
        {
            foreach (FieldInfo field in typeof 
(Level).GetFields(BindingFlags.Public | BindingFlags.Static))
            {
                if (field.FieldType != typeof (Level)) continue;

                var level = (Level) field.GetValue(null);
                if (!_levelMap.ContainsKey(level))
                {
                    _levelMap.Add(level, new NotificationType(field.Name));
                }
            }
            if (!String.IsNullOrEmpty(Hostname))
            {
                growl = new GrowlConnector(Password, Hostname, _port ?? 
ConnectorBase.TCP_PORT);
            }
            else if (!String.IsNullOrEmpty(Password))
            {
                growl = new GrowlConnector(Password);
            }
            else
            {
                growl = new GrowlConnector();
            }

            string fullName = Assembly.GetEntryAssembly().FullName;
            string name = fullName == null? "" : fullName.Split(',')[0];
            application = new Application(name);

            growl.ErrorResponse += growl_ErrorResponse;

            NotificationType[] notificationTypes = _levelMap.Values.ToArray();
            Array.Resize(ref notificationTypes, notificationTypes.Length + 1);
            notificationTypes[notificationTypes.Length - 1] = GENERAL;
            growl.Register(application, notificationTypes);
        }

        public string Password { get; set; }
        public string Hostname { get; set; }

        public string Port
        {
            get { return _port.ToString(); }
            set { _port = int.Parse(value); }
        }

        protected override void Append(LoggingEvent loggingEvent)
        {
            NotificationType notificationType;
            if (!_levelMap.TryGetValue(loggingEvent.Level, out 
notificationType))
            {
                notificationType = GENERAL;
            }
            string text = RenderLoggingEvent(loggingEvent);

            text = text.Replace('\n', '\r');

            //set callback id if you need information about the specific 
callback being called
            string callbackId = text;
            growl.Notify(new Notification(application.Name, 
notificationType.Name, callbackId,
                                          notificationType.DisplayName, text));
        }

        private static void growl_ErrorResponse(Response response)
        {
            
log4net.LogManager.GetLogger(typeof(GrowlAppender)).Error(String.Format("Error-Code:
 {0}\nError-Description: {1}", response.ErrorCode,
                                              response.ErrorDescription));
        }
    }
}

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