A very simple webhook integration with Slack and ServiceStack response filters

AppHost.cs

//Example use AppHost
public class AppHost : AppHostBase
{
    public AppHost()
        : base("SlackPluginExample", typeof(MyServices).Assembly) { }

    public override void Configure(Container container)
    {
        this.Plugins.Add(new SlackNotifierFeature
        {
            IncommingWebHookUrl = 
                "{Your Incoming WebHooks URL from slack, eg https://hooks.slack.com/services/....}",
            MessageFactories = new Dictionary<Type, Func<object, string>>
            {
                {
                    typeof(HelloResponse),
                    responseObject => {
                        var res = (HelloResponse) responseObject;
                        return "Service said {0}".Fmt(res.Result);
                    }
                }
            }
        });
    }
}

SlackNotifierFeature.cs

//Plugin itself
public class SlackNotifierFeature : IPlugin
{
    public string IncommingWebHookUrl { get; set; }
    public Dictionary<Type, Func<object, string>> MessageFactories = 
        new Dictionary<Type, Func<object, string>>();

    public void Register(IAppHost appHost)
    {
        appHost.GlobalResponseFilters.Add((request, response, responseObject) =>
        {
            if (!MessageFactories.ContainsKey(responseObject.GetType())) return;
            var messageToSlack = MessageFactories[responseObject.GetType()].Invoke(responseObject);
            IncommingWebHookUrl.PostJsonToUrl(new {Text = messageToSlack});
        });
    }
}