Blazor Server save SignalR connection to database to prevent loss?

Question

SignalR connection is connection between server and user and its "stored" in server memory.

There are some scenarios where SignalR is lost and user needs to reload the page.

When I need to restart the Server
When users sleeps his phone and get back to website after some time

Is it somehow possible to save these SignalR connection instances to Database, so when i restart my server it will reload them into Memory and user is able to reconnect to his previous state ?

user_9910440 · Answer

You don't have to persist the connection. What you need to persist is app/user session state. Go through this article below:

https://docs.microsoft.com/en-us/aspnet/core/blazor/state-management?view=aspnetcore-5.0&pivots=server

If you are looking for mobile app style resume functionality, that is very hard to achieve.

user_1492496 · Answer

I persist the connected users. In scaled services there is no guarentee you will get the same instance of the server. There is a feature called auto reconnect you can look at on the hub context other than that you should configure your clients to reconnect by monitoring the connection state. Either way you will get a new connectionId.

Blazor Server save SignalR connection to database to prevent loss?

2 Answers