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Type: Bug
Resolution: Works as Designed
Priority: Minor - P4
Fix Version/s: None
Affects Version/s: None
Component/s: None
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Github URL:
https://github.com/realm/realm-dotnet/issues/3205
GitHub#:
3205

What happened?

I am writing an app where I'll have Anonymous login for general public and Email/Password auth for members. So users should be able to log in and log out, whenever they log out the app should use anonymous user, and when they log in, the app should switch to the logged in user.

However, when I try to implement this logic, after logging in, logging out and then trying to log in again, it produces this error:
Realms.Exceptions.RealmMismatchedConfigException: 'Realm at path '.../database.realm' already opened with different sync user.'

The issue is consistent - it always happens.

I tried to manually call Dispose on realm instance before switching users - didn't help. Maybe I am doing something wrong?

Repro steps

the app logs in automatically with Anonymous provider, then
a user logs in with Email/Password. When that happens, app gets a new flexible config with the newly logged in user and uses it to get Realm instances
when the logged in user decides to log out, I simply call LogOutAsync and then change config back to use the now active anonymous user.
if I do this 1, 2 times, eventually I get this error:
Realms.Exceptions.RealmMismatchedConfigException: 'Realm at path 'C:\Users\x.dr\source\repos\movsar\chldr\chldr_server\bin\Debug\net6.0\data\database.realm' already opened with different sync user.'

Version

.NET 6

What Atlas Services are you using?

Atlas Device Sync

What type of application is this?

Other

Client OS and version

Windows 10

Code snippets

My RealmService:

    public class RealmService
    {
        private const string myRealmAppId = "dosham-lxwuu";

        private App _app { get; set; }
        private RealmConfigurationBase _config;

        internal event Action DatabaseInitialized;
        internal event Action DatabaseSynced;

        internal Realm GetRealm()
        {
            if (_config == null)
            {
                throw new Exception("Config shouldn't be null");
            }

            return Realm.GetInstance(_config);
        }

        internal async Task InitializeApp()
        {
            Logger.LogLevel = LogLevel.Debug;
            Logger.Default = Logger.Function(message =>
            {
                Debug.WriteLine($"APP: Realm : {message}");
            });

            _app = App.Create(new AppConfiguration(myRealmAppId)
            {
                BaseFilePath = FileService.AppDataDirectory,
            });

            var appUser = _app.CurrentUser;

            // Log in as anonymous user to be able to read data
            if (appUser?.State != UserState.LoggedIn)
            {
                appUser = await _app.LogInAsync(Credentials.Anonymous(true));
            }
        }

        internal void RefreshRealmConfig(Realms.Sync.User appUser)
        {
            _config = GetRealmConfigForSpecifiedUser(appUser);
        }

        private RealmConfigurationBase GetRealmConfigForSpecifiedUser(Realms.Sync.User appUser)
        {
            if (appUser == null)
            {
                throw new Exception("User must not be null");
            }

            return new FlexibleSyncConfiguration(appUser, FileService.DatabasePath)
            {
                SchemaVersion = 1,
                PopulateInitialSubscriptions = (realm) =>
                {
                    Debug.WriteLine($"APP: Realm : PopulateInitialSubscriptions");

                    realm.Subscriptions.Add(realm.All<Entities.Entry>());
                    realm.Subscriptions.Add(realm.All<Entities.Language>());
                    realm.Subscriptions.Add(realm.All<Entities.Phrase>());
                    realm.Subscriptions.Add(realm.All<Entities.Source>());
                    realm.Subscriptions.Add(realm.All<Entities.Translation>());
                    realm.Subscriptions.Add(realm.All<Entities.User>());
                    realm.Subscriptions.Add(realm.All<Entities.Word>());
                }
            };
        }

        internal App GetApp()
        {
            return _app;
        }
   }

My DataAccess file:

public class DataAccess : IDataAccess
{
  public Realms.Sync.App App => _realmService.GetApp();
      public Realm Database
      {
          get
          {
              var realm = _realmService.GetRealm();
              if (App.CurrentUser.Provider == Credentials.AuthProvider.Anonymous)
              {
                  // Don't try to sync anything if a legitimate user hasn't logged in
                  realm.SyncSession.Stop();
              }

              return realm;
          }
      }

      public event Action DatabaseInitialized;
      private RealmService _realmService;

      public async Task Initialize()
      {
          await _realmService.InitializeApp();
          _realmService.RefreshRealmConfig(App.CurrentUser);
      }

      public DataAccess(FileService fileService, RealmService realmService)
      {
          _searchEngine = new MainSearchEngine(this);
          _realmService = realmService;

          if (App != null)
          {
              return;
          }

          fileService.PrepareDatabase();

          _realmService.DatabaseInitialized += () =>
          {
              DatabaseInitialized?.Invoke();
          };

          Task.Run(async () => await Initialize());
      }

      public async Task LogInEmailPasswordAsync(string email, string password)
      {
          var appUser = await App.LogInAsync(Credentials.EmailPassword(email, password));
          _realmService.RefreshRealmConfig(appUser);
      }

      public async Task LogOutAsync()
      {
          await App.CurrentUser.LogOutAsync();
          _realmService.RefreshRealmConfig(App.CurrentUser);
      }
}

Stacktrace of the exception/crash you're getting

Unable to find source-code formatter for language: shell. Available languages are: actionscript, ada, applescript, bash, c, c#, c++, cpp, css, erlang, go, groovy, haskell, html, java, javascript, js, json, lua, none, nyan, objc, perl, php, python, r, rainbow, ruby, scala, sh, sql, swift, visualbasic, xml, yaml

Realms.Exceptions.RealmMismatchedConfigException
  HResult=0x80131500
  Message=Realm at path 'C:\Users\x.dr\source\repos\movsar\chldr\chldr_server\bin\Debug\net6.0\data\database.realm' already opened with different sync user.
  Source=Realm
  StackTrace:
   at Realms.Sync.SyncConfigurationBase.CreateHandle(RealmSchema schema)
   at Realms.RealmConfigurationBase.CreateRealm()
   at Realms.Sync.FlexibleSyncConfiguration.CreateRealm()
   at chldr_data.Services.RealmService.GetRealm() in C:\Users\x.dr\source\repos\movsar\chldr\chldr_data\Services\RealmService.cs:line 30
   at chldr_data.Services.DataAccess.get_Database() in C:\Users\x.dr\source\repos\movsar\chldr\chldr_data\Services\DataAccess.cs:line 24
   at chldr_data.Services.DataAccess.<GetCurrentUserInfoAsync>d__14.MoveNext() in C:\Users\x.dr\source\repos\movsar\chldr\chldr_data\Services\DataAccess.cs:line 58
   at chldr_shared.Stores.UserStore.<SetCurrentUserInfoAsync>d__17.MoveNext() in C:\Users\x.dr\source\repos\movsar\chldr\chldr_shared\Stores\UserStore.cs:line 64
   at chldr_shared.Stores.UserStore.<<LogInEmailPasswordAsync>b__18_0>d.MoveNext() in C:\Users\x.dr\source\repos\movsar\chldr\chldr_shared\Stores\UserStore.cs:line 80

-- Realm output Logs
Exception thrown: 'Realms.Exceptions.RealmMismatchedConfigException' in Realm.dll
Exception thrown: 'Realms.Exceptions.RealmMismatchedConfigException' in System.Private.CoreLib.dll
Exception thrown: 'Realms.Exceptions.RealmMismatchedConfigException' in chldr_shared.dll
Exception thrown: 'Realms.Exceptions.RealmMismatchedConfigException' in System.Private.CoreLib.dll
An exception of type 'Realms.Exceptions.RealmMismatchedConfigException' occurred in System.Private.CoreLib.dll but was not handled in user code
Realm at path 'C:\Users\x.dr\source\repos\movsar\chldr\chldr_server\bin\Debug\net6.0\data\database.realm' already opened with different sync user.

Relevant log output

Unable to find source-code formatter for language: shell. Available languages are: actionscript, ada, applescript, bash, c, c#, c++, cpp, css, erlang, go, groovy, haskell, html, java, javascript, js, json, lua, none, nyan, objc, perl, php, python, r, rainbow, ruby, scala, sh, sql, swift, visualbasic, xml, yaml

>	[Exception] chldr_data.dll!chldr_data.Services.RealmService.GetRealm() Line 30	C#
 	[Exception] chldr_data.dll!chldr_data.Services.DataAccess.Database.get() Line 24	C#
 	[Exception] chldr_data.dll!chldr_data.Services.DataAccess.GetCurrentUserInfoAsync() Line 58	C#
 	[Exception] chldr_shared.dll!chldr_shared.Stores.UserStore.SetCurrentUserInfoAsync() Line 64	C#
 	[External Code]	
 	[Waiting on Async Operation, double-click or press enter to view Async Call Stacks]	
 	chldr_shared.dll!chldr_shared.Stores.UserStore.LogInEmailPasswordAsync.AnonymousMethod__18_0() Line 80	C#

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Repro steps

Version

What Atlas Services are you using?

What type of application is this?

Client OS and version

Code snippets

Stacktrace of the exception/crash you're getting

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