PlayFab Party in Unity - Network Teardown on Error

Hi Citrus,

The TitleId is: 58956 and we are using playfab-party.1.5.0.1-main.0-10.27.2020-preview for Unity.

Our game is targeting Windows Gamecore using the GDK. We ran the GDK install script in the PlayFabParty plugin for Unity as described. Perhaps there is something there we could verify?

In terms of reproduction, this issue happens either in real builds or in the Editor.

On Start of our scene, we register the PlayFabParty listeners:

    public void Start()
    {
        if (string.IsNullOrEmpty(PlayFabSettings.staticSettings.TitleId))
        {
            PlayFabSettings.staticSettings.TitleId = "58956";
        }
        PlayFabMultiplayerManager.Get().OnNetworkJoined += OnNetworkJoined;
        PlayFabMultiplayerManager.Get().OnNetworkLeft += OnNetworkLeft;
        PlayFabMultiplayerManager.Get().OnError += OnPlayFabError;
    }

Upon user pressing a "Start Matchmaking" button, the game logs in:

if(lastLoginResult == null || !PlayFabClientAPI.IsClientLoggedIn()){  var request = new LoginWithCustomIDRequest {    CustomId = PlayerId, CreateAccount = true  };
  PlayFabClientAPI.LoginWithCustomID(request, OnLoginSuccess, OnLoginFailure);
}

Note that in builds we are using XboxLive Authentication, in the Editor we are using a CustomId Authentication just for testing. But the flow is identical.

We cache the lastLoginResult and also try to validate the client is logged in. But removing that makes no difference to the problems encountered.

In the OnLoginSuccess event, we simply create a Party Network:

PlayFabMultiplayerManager.Get().CreateAndJoinNetwork();

We then wait for the OnNetworkJoined event and continue from there.

When the game is finished or if an error occurs or the game is cancelled we do the following:

PlayFabMultiplayerManager.Get().LeaveNetwork();PlayFabMultiplayerAPI.CancelMatchmakingTicket(
  new CancelMatchmakingTicketRequest
  {
    QueueName = MatchmakingQueue,
    TicketId = matchmakingTicketId,
  },
  this.OnMatchmakingTicketCancelled,
  this.OnMatchmakingError);

In normal situations this works fine, the user can play many games they can cancel or let the game complete. Disconnections also work (we use our cancel logic above in response to OnRemotePlayerLeft).

However, if there is any kind of network issue, then we we restart the whole process... the call to CreateAndJoinNetwork will never call either the success or failure callback. And most times we get OnError event with the error codes mentioned in the first post.

It can also be reproduced by starting the game with no network connection. If you then plug cable in, the problem will occur on the very first attempt.

It seems to be related to login state, or something not being appropriately reset. But we can't find any documenation or other methods we should call in the lifecycle. So any advice greatly appreciated.

Hi Citrus,

We were still seeing 4330 (and actually several other errors), it appears to be due to some errors marshalling objects between the native DLL and the CS layer.

There are also several places in the state machine where it will just hang in certain circumstances particularly around login after network connection if that app was booted without.

Thanks Citrus,

We arrived at something similar, resetting the state before each session we created. We seem to have addressed most issues - though there were many places we had to tweak the PlayFabMultiplayerManager state machine for different edge cases.

The remaining issue is that we often get strange errors marshalling objects between the native and cs layer. It seems to be related to the region list.

In the state PARTY_CREATE_NEW_NETWORK_COMPLETED_STATE_CHANGE

The region list often seems to be corrupted or to fail, this causes bad data to go into this line:

this.regions = Converters.PtrToClassArray<PARTY_REGION, Interop.PARTY_REGION>(
  stateChangeConverted.regions,
  regionCount,
  (x) => new PARTY_REGION(x));

Which then causes an Overflow of OutOfMemory exception in PtrToClassArray because the count is a huge invalid number:

ClassType[] ret = new ClassType[(Int32)count];

For now I am checking the count and protecting against this, but it seems there is a deeper issue here.

Hi Citrus,

Those errors happen on every network connection if you use the XBL login provider. I discovered that region data is always just totally corrupt. Once in a while I get an error saying the region data could not be retrieved (especially after a network disconnect).

I discovered the region data is not actually used, so I simply remove all of this, the exception and crashes go away.