Implementing PlayFab's lobby notifications using SignalR

theo 1 Reputation point
2022-05-23T10:22:12.71+00:00

Hi,

I'm trying to implement PlayFab's lobby notifications which relies on SignalR.
One of the things I have to do to start receving notifications from the SignalR service is to start the session by calling a server method (signalr-hub start-or-recover-session).
Here is how my code looks like at the moment : 

public struct StartOrRecoverSessionResponse  
{  
    public string newConnectionHandle;  
    public string[] recoveredTopics;  
    public string status;  
    public string traceId;  
}  
  
public struct StartOrRecoverSessionArgs  
{  
    public string oldConnectionHandle;  
    public string traceParent;  
}  
  
...  
  
_connection = new HubConnectionBuilder()  
    .WithUrl("https://mytitleid.playfabapi.com/pubsub", ConfigureHttpConnection)  
    .ConfigureLogging((builder) =>  
    {  
        builder.AddProvider(new SignalRLoggerProvider());  
    })  
    .Build();  
  
_connection.On<string>("ReceiveMessage", (message) =>  
{  
    Debug.Log($"ReceivedMessage {message}");  
});  
  
_connection.On<string>("ReceiveSubscriptionChangeMessage", (message) =>  
{  
    Debug.Log($"ReceiveSubscriptionChangeMessage {message}");  
});  
  
try  
{  
    await _connection.StartAsync();  
  
    var response = await _connection.InvokeAsync<StartOrRecoverSessionResponse>("StartOrRecoverSession", new StartOrRecoverSessionArgs() {  
        oldConnectionHandle = "",  
        traceParent = "00-84678fd69ae13e41fce1333289bcf482-22d157fb94ea4827-01"  
    });  
  
    Debug.Log("Connection Handle " + response.ToString());  
}  
catch (Exception ex)  
{  
    Debug.LogError(ex.Message);  
}

It doesn't trigger any exception but the returned struct is always filled with null strings.

StartOrRecoverSessionArgs and StartOrRecoverSessionResponse are structs that I created by following StartOrRecoverSession's documentation.

I originally posted on PlayFab forums at implementing-lobby-notifications-with-c-and-micros.html

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A set of technologies in the .NET Framework for building web applications and XML web services.
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An object-oriented and type-safe programming language that has its roots in the C family of languages and includes support for component-oriented programming.
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1 answer

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  1. Sergo Martirosov 0 Reputation points
    2023-07-27T08:30:08.4466667+00:00

    If you encounter the same issue, try making the following modification to the StartOrRecoverSessionResponse to resolve the problem:

    [Serializable]
public class StartOrRecoverSessionResponse
{
    [Newtonsoft.Json.JsonProperty("newConnectionHandle")]
    public string NewConnectionHandle { get; set; }

    [Newtonsoft.Json.JsonProperty("recoveredTopics")]
    public string[] RecoveredTopics { get; set; }

    [Newtonsoft.Json.JsonProperty("status")]
    public string Status { get; set; }

    [Newtonsoft.Json.JsonProperty("traceId")]
    public string TraceId { get; set; }

    public StartOrRecoverSessionResponse(string newConnectionHandle, string[] recoveredTopics, string status, string traceId)
    {
        this.NewConnectionHandle = newConnectionHandle;
        this.RecoveredTopics = recoveredTopics;
        this.Status = status;
        this.TraceId = traceId;
    }
}


            // Initialize the SignalR connection
        connection = new HubConnectionBuilder()
            .WithUrl("https://xxxxx.playfabapi.com/PubSub", options => { options.Headers.Add("X-EntityToken", entityToken); })
            .WithAutomaticReconnect()
            .Build();

    // Start the SignalR connection
await connection.StartAsync();
            
var response = await connection.InvokeAsync<StartOrRecoverSessionResponse>("StartOrRecoverSession", new StartOrRecoverSessionRequest { traceParent = "00-84678fd69ae13e41fce1333289bcf482-22d157fb94ea4827-01" });
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