Sharing a SignalR hub between a WebApi and MVC project

15
votes

Is there a recommended approach to sharing a SignalR hub across two applications?

The actual situation is a public facing WebAPI project and an internal MVC WebApp. What I'd like to do is call methods on a SignalR hub from the WebAPI project and have the results of these methods pushed to clients connected via the MVC app.

Would the best option be to create a third 'Hub' project and have both projects connect to that? If so, how are the hub instances managed? Can both applications get a reference to the same hub from distinct app pools (and possibly hosts)?

I read a little bit about GlobalHost.ConnectionManager.GetHubContext, would this suffice to get a effectively a singleton hub which both apps could use?

Any thoughts greatly appreciated.

1
asp.net-web-apisignalrsignalr-hub
signalR supports CORS at different domains , so you could use 1 app to serve both apps.p.s. +1 nice question. – Royi Namir
Would that imply that it'd be best placed to extract the Hub into a separate app and let two others call it? This was my suspicion as I couldn't think of a nice way to place it in either one of the existing projects and have them call each other. – dougajmcdonald
please have a look at this. asp.net/signalr/overview/performance-and-scaling/… – Royi Namir
Interesting stuff, we aim to deploy both the WebAPI and MVC app to Azure, but in the form of a VPN/VM with both sites running on the same VM. I'm not 100% sure whether this would count as a single server or not (would hope yes) so we may be able to avoid using a backplane approach, but would still need to share a hub across apps. – dougajmcdonald
well , I can tell you that in the next few hours/tomorrow you'll get more appropriate answer from the sR team members which has much more knowledge than I have :-) I will keep tracking this question cuz i'd like to hear best practices for that issue. – Royi Namir

1 Answers

4
votes

Just setup signalr message routing through a SQL Server table. It will automatically connect all hubs using the same routing setup. Nothing else to do, it's magic.

GlobalHost.DependencyResolver.UseSqlServer(ConfigurationManager.ConnectionStrings["signalr"].ConnectionString);

You will need the following nuget package: Microsoft.AspNet.SignalR.SqlServer