Can't reentrant(?) call in StreamingHub

[prisira]

Using MagicOnion 7.0.0-preview.10

In StreamingHub

Server <- Client
   |
   v
Server -> Client
            |
            v
Server <- Client
  No response returned here...

Would like to know if there is a plan to make this possible.

[mayuki]

Is the server calling the client a broadcast or client results? Is it something like the following?
In any case, the Hub method processes in serial for the client, so if the Hub methods wait for each other, a deadlock will occur.

Client results

sequenceDiagram
    Client->>+Server: Invoke HubMethodA
    Server->>+Client: Invoke ClientMethodA
    Client->>+Server: Invoke HubMethodB
    Server-->>-Client: Return from HubMethodB
    Client-->>-Server: Return from ClientMethodA
    Server-->>-Client: Return from HubMethodA

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Broadcast

sequenceDiagram
    Client->>+Server: Invoke HubMethodA
    Server->>+Client: OnBroadcastMethodA
    Server-->>-Client: Return from HubMethodA
    Client->>Server: Invoke HubMethodB
    Server-->>Client: Return from HubMethodB

Loading

[prisira]

Thank you for the detailed diagram.

Yes, the “Client Results” case is being used.
I see, a deadlock occurs when multiple duplex calls are made simultaneously.

In cases where the Client and Server need to communicate closely, this prevents the use of mechanisms like try/catch or a using scope, making the implementation much more complicated.
I would be very grateful if this could be improved.

And... If the Hub method processes are sequential, Then I realized there is a workaround using Task.Run in a method, but this method is challenging to use because it does not properly wait for the complete.