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GetScopeInfoAsync Internal Server Error

See original GitHub issue

Hello, I try to implement the multiple scopes migration. But when I try to use RemoteOrchestrator.GetScopeInfoAsync I get a internal server error.

Code-Client

var scopeMigration = await GetScopeNameAsync(_configScope, agentConfig);
s1 = await agentConfig.SynchronizeAsync(scopeMigration.OldScopeName, parameters, _progress);
_logger.LogInformation(4810, "Sync Config Result: {Result}", s1);

if (scopeMigration.IsNew)
{
	var serverScopeInfo = await agentConfig.RemoteOrchestrator.GetScopeInfoAsync(scopeMigration.NewScopeName);
	var newScopeInfo = await agentConfig.LocalOrchestrator.ProvisionAsync(serverScopeInfo);

	var newScopeInfoClient = await agentConfig.LocalOrchestrator.GetScopeInfoClientAsync(newScopeInfo.Name);
	var oldScopeInfoClient = await agentConfig.LocalOrchestrator.GetScopeInfoClientAsync(scopeMigration.OldScopeName);

	newScopeInfoClient.ShadowScope(oldScopeInfoClient);
	await agentConfig.LocalOrchestrator.SaveScopeInfoClientAsync(newScopeInfoClient);
}

Code-Server

/// <summary>
/// This POST handler is mandatory to handle all the sync process
/// </summary>
/// <returns></returns>
[HttpPost]
public async Task Post()
{
	try
	{
		var scopeName = HttpContext.GetScopeName();

		var webserverAgent = webserverAgents.FirstOrDefault(c => c.ScopeName == scopeName);

		await webserverAgent.HandleRequestAsync(HttpContext).ConfigureAwait(false);
	}
	catch (Exception ex)
	{
		_logger.LogError(ex, ex.Message);
		throw;
	}
}

Error

2022-10-28 08:32:56.237 +02:00 [ERR] An unhandled exception has occurred while executing the request.
System.NullReferenceException: Object reference not set to an instance of an object.
   at Random.DatabaseSync.Controllers.SyncController.Post()
   at lambda_method4(Closure , Object )
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.AwaitableResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Logged|17_1(ResourceInvoker invoker)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.<Invoke>g__Awaited|6_0(ExceptionHandlerMiddleware middleware, HttpContext context, Task task)
2022-10-28 08:32:56.241 +02:00 [WRN] No exception handler was found, rethrowing original exception.
2022-10-28 08:32:56.241 +02:00 [ERR] Connection ID "18014398511092611197", Request ID "80003881-0000-fa00-b63f-84710c7967bb": An unhandled exception was thrown by the application.
System.NullReferenceException: Object reference not set to an instance of an object.
   at Random.DatabaseSync.Controllers.SyncController.Post()
   at lambda_method4(Closure , Object )
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.AwaitableResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Logged|17_1(ResourceInvoker invoker)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.<Invoke>g__Awaited|6_0(ExceptionHandlerMiddleware middleware, HttpContext context, Task task)
   at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.HandleException(HttpContext context, ExceptionDispatchInfo edi)
   at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.<Invoke>g__Awaited|6_0(ExceptionHandlerMiddleware middleware, HttpContext context, Task task)
   at Microsoft.AspNetCore.Server.IIS.Core.IISHttpContextOfT`1.ProcessRequestAsync()
2022-10-28 08:32:56.243 +02:00 [INF] Request finished HTTP/1.1 POST http://10.0.0.92:8004/api/sync/ application/json 86 - 500 - - 22.4363ms
2022-10-28 08:32:56.781 +02:00 [INF] Request starting HTTP/1.1 POST http://10.0.0.92:8004/api/sync/ application/json 86
2022-10-28 08:32:56.781 +02:00 [INF] Executing endpoint 'Random.DatabaseSync.Controllers.SyncController.Post (Random.DatabaseSync)'
2022-10-28 08:32:56.781 +02:00 [INF] Route matched with {action = "Post", controller = "Sync"}. Executing controller action with signature System.Threading.Tasks.Task Post() on controller Random.DatabaseSync.Controllers.SyncController (Random.DatabaseSync).
2022-10-28 08:32:56.781 +02:00 [ERR] Object reference not set to an instance of an object.
System.NullReferenceException: Object reference not set to an instance of an object.
   at Random.DatabaseSync.Controllers.SyncController.Post()
2022-10-28 08:32:56.782 +02:00 [INF] Executed action Random.DatabaseSync.Controllers.SyncController.Post (Random.DatabaseSync) in 0.8425ms
2022-10-28 08:32:56.782 +02:00 [INF] Executed endpoint 'Random.DatabaseSync.Controllers.SyncController.Post (Random.DatabaseSync)'
2022-10-28 08:32:56.782 +02:00 [ERR] An unhandled exception has occurred while executing the request.
System.NullReferenceException: Object reference not set to an instance of an object.
   at Random.DatabaseSync.Controllers.SyncController.Post()
   at lambda_method4(Closure , Object )
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.AwaitableResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Logged|17_1(ResourceInvoker invoker)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.<Invoke>g__Awaited|6_0(ExceptionHandlerMiddleware middleware, HttpContext context, Task task)
2022-10-28 08:32:56.783 +02:00 [WRN] No exception handler was found, rethrowing original exception.
2022-10-28 08:32:56.783 +02:00 [ERR] Connection ID "18014398511092611197", Request ID "80003882-0000-fa00-b63f-84710c7967bb": An unhandled exception was thrown by the application.
System.NullReferenceException: Object reference not set to an instance of an object.
   at Random.DatabaseSync.Controllers.SyncController.Post()
   at lambda_method4(Closure , Object )
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.AwaitableResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location ---
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Logged|17_1(ResourceInvoker invoker)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.<Invoke>g__Awaited|6_0(ExceptionHandlerMiddleware middleware, HttpContext context, Task task)
   at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.HandleException(HttpContext context, ExceptionDispatchInfo edi)
   at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.<Invoke>g__Awaited|6_0(ExceptionHandlerMiddleware middleware, HttpContext context, Task task)
   at Microsoft.AspNetCore.Server.IIS.Core.IISHttpContextOfT`1.ProcessRequestAsync()
2022-10-28 08:32:56.784 +02:00 [INF] Request finished HTTP/1.1 POST http://10.0.0.92:8004/api/sync/ application/json 86 - 500 - - 2.9724ms

Issue Analytics

State:
Created a year ago
Comments:10 (6 by maintainers)

Top GitHub Comments

1reaction

BluePalmTreecommented, Nov 3, 2022

Sure.

In the Startup.cs you have to add the line:

services.AddMemoryCache();

And this is the code for the controller action:

public SyncController(IConfiguration configuration,
					  IEnumerable<WebServerAgent> webServerAgents,
					  ILogger<SyncController> logger,
					  IMemoryCache memoryCache)
{
	_configuration = configuration ?? throw new ArgumentNullException(nameof(configuration));
	_logger = logger ?? throw new ArgumentNullException(nameof(logger));
	_memoryCache = memoryCache ?? throw new ArgumentNullException(nameof(memoryCache));

	this.webserverAgents = webServerAgents ?? throw new ArgumentNullException(nameof(webServerAgents));
}

[HttpPost]
public async Task Post()
{
	try
	{
		var scopeName = HttpContext.GetScopeName();

		var webserverAgent = webserverAgents.FirstOrDefault(c => c.ScopeName == scopeName);

		if (webserverAgent == null)
		{
			if (!_memoryCache.TryGetValue(scopeName, out webserverAgent))
			{
				var connectionString = _configuration.GetConnectionString("DefaultConnection");
				var syncOptions = _configuration.GetSection("SyncOptions");
				var snapshotDirectory = syncOptions.GetValue<string>("SnapshotDirectory");
				var snapshotBatchSize = syncOptions.GetValue<int>("SnapshotBatchsize");

				var options = new SyncOptions
				{
					BatchSize = snapshotBatchSize
				};

				if (!string.IsNullOrWhiteSpace(snapshotDirectory))
				{
					options.SnapshotsDirectory = snapshotDirectory;
				}

				var serverProvider = new SqlSyncChangeTrackingProvider(connectionString);
				var remoteOrchestrator = new RemoteOrchestrator(serverProvider);
				var scopeInfo = await remoteOrchestrator.GetScopeInfoAsync(scopeName).ConfigureAwait(false);
				webserverAgent = new WebServerAgent(serverProvider, scopeInfo.Setup, options, null, scopeInfo.Name);

				_memoryCache.Set(scopeName, webserverAgent, new MemoryCacheEntryOptions().SetSlidingExpiration(TimeSpan.FromSeconds(90)));
			}
		}

		await webserverAgent.HandleRequestAsync(HttpContext).ConfigureAwait(false);
	}
	catch (Exception ex)
	{
		_logger.LogError(ex, ex.Message);
		throw;
	}
}

0reactions

Mimetiscommented, Nov 3, 2022

thanks awesome work !!