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POHow to communicate Server to Client with SignalR in Nancy with ASP.NET Hosting?
 

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  1. POHow to communicate Server to Client with SignalR in Nancy with ASP.NET Hosting?
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    <p>Most of the examples I've found for <a href="http://signalr.net/" rel="nofollow noreferrer">SignalR</a> are assuming ASP.NET (MVC or not). I'm using <a href="http://www.nancyfx.org" rel="nofollow noreferrer">NancyFX</a>. I'm having just one problem, so I'm hoping there's something I'm overlooking or some thing I need to do in Nancy to compensate for not being ASP.NET.</p> <p>My one goal is to be able to notify the client browsers when a server event happens. I don't plan on replacing my Nancy routes with hub methods. But I would like the ability to call into the browser from my routes (actions). </p> <p>I have very simple Hub that I created following the example in the <a href="https://github.com/SignalR/SignalR/wiki/QuickStart-Hubs" rel="nofollow noreferrer">SignalR Wiki</a>. I'm not even sure I need it, since I don't plan on calling client to server.</p> <pre><code>public interface IUserNotifier { void Start(); void Notify(object @event); } </code></pre> <p>I used an interface in hopes that I would be able to inject the same hub later on to use in my nancy routes... I'm not sure that is in the cards.</p> <pre><code>[HubName("userNotifier")] public class UserNotifier : Hub, IUserNotifier { public void Start() { Notify(new {Status = "Started"}); } public void Notify(object @event) { Clients.notification(@event); } } </code></pre> <p>When I have the following code in my html file, I can see that it executes the <code>Start()</code> method, and then the <code>Notify()</code> method, delivering content to my client.</p> <pre><code>var communicator = $.connection.userNotifier; $.extend(communicator, { Notification: function(event) { alert("notification received from server!"); console.log(event); } }); $.connection.hub.start() .done(function() { communicator.start(); }); </code></pre> <p>Like I said, "starting" the hub works and sends a notification to the client. Very cool. But, then, my primary goal hasn't been accomplished yet. I need to initiate these notifications from other places in my code where they might not be directly associated with a "request".</p> <p>I tried injecting my IUserNotifier in my nancy modules for use in the routes, but when the <code>Notify()</code> is fired, I get:</p> <p><img src="https://i.stack.imgur.com/YSB1k.png" alt="Cannot perform runtime binding on a null reference"></p> <p>That's because the <code>Clients</code> property on the <code>Hub</code> base class is null (hasn't been initialized). So, I switched gears. I tried to follow multiple examples, including the example from the <a href="https://github.com/SignalR/SignalR/wiki/Hubs" rel="nofollow noreferrer">wiki page about hubs</a> in the section called "Broadcasting over a Hub from outside of a Hub":</p> <pre><code>public class NotifierModule : NancyModule { public NotifierModule(){ Get["/notify/{message}"] = p =&gt; { var context = GlobalHost.ConnectionManager.GetHubContext&lt;UserNotifier&gt;(); context.Clients.notification(new { Message = p.message }); }; } } </code></pre> <p>My Nancy route executes without throwing errors. Except my browser never receives the message. If I set a breakpoint in the route, I can see that <code>Clients</code> is initialized. Maybe the collection of clients is initialized but empty. Who knows? Maybe you do. :)</p> <p>Again, my main goal is to be able to send events/notifications to the browser from anywhere in my code, any time. Is that too much to ask? What should I be doing here? </p>
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