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RDB-136 Flow tabel wordt niet meer opgeruimd Bij een exceptie in Flow

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Refactoring om de actie van de Exceptionstrategie door te geven aan de cleanup stack
Megre bug geresolved
This commit is contained in:
Menno van Lavieren 2017-10-17 13:29:16 +02:00
parent 355c992dbf
commit be7637e784
13 changed files with 243 additions and 19 deletions
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5
Tapeti.Flow/Default/FlowCleanupMiddleware.cs
View File

@ -9,7 +9,7 @@ namespace Tapeti.Flow.Default
{
public class FlowCleanupMiddleware : ICleanupMiddleware
{
public async Task Handle(IMessageContext context, ConsumeResponse response)
public async Task Handle(IMessageContext context, HandlingResult handlingResult)
{
object flowContextObj;
if (!context.Items.TryGetValue(ContextItems.FlowContext, out flowContextObj))
@ -18,7 +18,8 @@ namespace Tapeti.Flow.Default
if (flowContext.FlowStateLock != null)
{
if (response == ConsumeResponse.Nack)
if (handlingResult.ConsumeResponse == ConsumeResponse.Nack
|| handlingResult.MessageAction == MessageAction.ErrorLog)
{
await flowContext.FlowStateLock.DeleteFlowState();
}

29
Tapeti.Flow/Default/FlowStarter.cs
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@ -52,7 +52,34 @@ namespace Tapeti.Flow.Default
};
var flowHandler = config.DependencyResolver.Resolve<IFlowHandler>();
await flowHandler.Execute(context, yieldPoint);
HandlingResultBuilder handlingResult = new HandlingResultBuilder
{
ConsumeResponse = ConsumeResponse.Nack,
};
try
{
await flowHandler.Execute(context, yieldPoint);
handlingResult.ConsumeResponse = ConsumeResponse.Ack;
}
finally
{
await RunCleanup(context, handlingResult.ToHandlingResult());
}
}
private async Task RunCleanup(MessageContext context, HandlingResult handlingResult)
{
foreach (var handler in config.CleanupMiddleware)
{
try
{
await handler.Handle(context, handlingResult);
}
catch (Exception eCleanup)
{
logger.HandlerException(eCleanup);
}
}
}

2
Tapeti/Config/ICleanupMiddleware.cs
View File

@ -8,6 +8,6 @@ namespace Tapeti.Config
{
public interface ICleanupMiddleware
{
Task Handle(IMessageContext context, ConsumeResponse response);
Task Handle(IMessageContext context, HandlingResult handlingResult);
}
}

17
Tapeti/Config/IExceptionStrategyContext.cs Normal file
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@ -0,0 +1,17 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Tapeti.Config
{
public interface IExceptionStrategyContext
{
IMessageContext MessageContext { get; }
Exception Exception { get; }
HandlingResultBuilder HandlingResult { get; set; }
}
}

38
Tapeti/Connection/TapetiConsumer.cs
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@ -44,7 +44,7 @@ namespace Tapeti.Connection
{
ExceptionDispatchInfo exception = null;
MessageContext context = null;
ConsumeResponse response = ConsumeResponse.Nack;
HandlingResult handlingResult = null;
try
{
try
@ -59,7 +59,11 @@ namespace Tapeti.Connection
await DispatchMesage(context, body);
response = ConsumeResponse.Ack;
handlingResult = new HandlingResult
{
ConsumeResponse = ConsumeResponse.Ack,
MessageAction = MessageAction.None
};
}
catch (Exception eDispatch)
{
@ -67,7 +71,11 @@ namespace Tapeti.Connection
logger.HandlerException(eDispatch);
try
{
response = exceptionStrategy.HandleException(null, exception.SourceException);
var exceptionStrategyContext = new ExceptionStrategyContext(context, exception.SourceException);
exceptionStrategy.HandleException(exceptionStrategyContext);
handlingResult = exceptionStrategyContext.HandlingResult.ToHandlingResult();
}
catch (Exception eStrategy)
{
@ -76,7 +84,15 @@ namespace Tapeti.Connection
}
try
{
await RunCleanup(context, response);
if (handlingResult == null)
{
handlingResult = new HandlingResult
{
ConsumeResponse = ConsumeResponse.Nack,
MessageAction = MessageAction.None
};
}
await RunCleanup(context, handlingResult);
}
catch (Exception eCleanup)
{
@ -87,7 +103,15 @@ namespace Tapeti.Connection
{
try
{
await worker.Respond(deliveryTag, response);
if (handlingResult == null)
{
handlingResult = new HandlingResult
{
ConsumeResponse = ConsumeResponse.Nack,
MessageAction = MessageAction.None
};
}
await worker.Respond(deliveryTag, handlingResult.ConsumeResponse);
}
catch (Exception eRespond)
{
@ -108,13 +132,13 @@ namespace Tapeti.Connection
});
}
private async Task RunCleanup(MessageContext context, ConsumeResponse response)
private async Task RunCleanup(MessageContext context, HandlingResult handlingResult)
{
foreach(var handler in cleanupMiddleware)
{
try
{
await handler.Handle(context, response);
await handler.Handle(context, handlingResult);
}
catch (Exception eCleanup)
{

40
Tapeti/Default/ExceptionStrategyContext.cs Normal file
View File

@ -0,0 +1,40 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tapeti.Config;
namespace Tapeti.Default
{
public class ExceptionStrategyContext : IExceptionStrategyContext
{
internal ExceptionStrategyContext(IMessageContext messageContext, Exception exception)
{
MessageContext = messageContext;
Exception = exception;
}
public IMessageContext MessageContext { get; }
public Exception Exception { get; }
private HandlingResultBuilder handlingResult;
public HandlingResultBuilder HandlingResult
{
get
{
if (handlingResult == null)
{
handlingResult = new HandlingResultBuilder();
}
return handlingResult;
}
set
{
handlingResult = value;
}
}
}
}

17
Tapeti/Default/NackExceptionStrategy.cs Normal file
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@ -0,0 +1,17 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tapeti.Config;
namespace Tapeti.Default
{
public class NackExceptionStrategy : IExceptionStrategy
{
public void HandleException(IExceptionStrategyContext context)
{
context.HandlingResult.ConsumeResponse = ConsumeResponse.Nack;
}
}
}

5
Tapeti/Default/RequeueExceptionStrategy.cs
View File

@ -5,10 +5,9 @@ namespace Tapeti.Default
{
public class RequeueExceptionStrategy : IExceptionStrategy
{
public ConsumeResponse HandleException(IMessageContext context, Exception exception)
public void HandleException(IExceptionStrategyContext context)
{
// TODO log exception
return ConsumeResponse.Requeue;
context.HandlingResult.ConsumeResponse = ConsumeResponse.Requeue;
}
}
}

79
Tapeti/HandlingResult.cs Normal file
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@ -0,0 +1,79 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Tapeti
{
public class HandlingResult
{
public HandlingResult()
{
ConsumeResponse = ConsumeResponse.Nack;
MessageAction = MessageAction.None;
}
/// <summary>
/// Determines which response will be given to the message bus from where the message originates.
/// </summary>
public ConsumeResponse ConsumeResponse { get; internal set; }
/// <summary>
/// Registers which action the Exception strategy has taken or will take to handle the error condition
/// on the message. This is important to know for cleanup handlers registered by middleware.
/// </summary>
public MessageAction MessageAction { get; internal set; }
}
public class HandlingResultBuilder
{
private static readonly HandlingResult Default = new HandlingResult();
private HandlingResult data = Default;
public ConsumeResponse ConsumeResponse {
get
{
return data.ConsumeResponse;
}
set
{
GetWritableData().ConsumeResponse = value;
}
}
public MessageAction MessageAction
{
get
{
return data.MessageAction;
}
set
{
GetWritableData().MessageAction = value;
}
}
public HandlingResult ToHandlingResult()
{
if (data == Default)
{
return new HandlingResult();
}
var result = GetWritableData();
data = Default;
return result;
}
private HandlingResult GetWritableData()
{
if (data == Default)
{
data = new HandlingResult();
}
return data;
}
}
}

8
Tapeti/IExceptionStrategy.cs
View File

@ -8,9 +8,9 @@ namespace Tapeti
/// <summary>
/// Called when an exception occurs while handling a message.
/// </summary>
/// <param name="context">The message context if available. May be null!</param>
/// <param name="exception">The exception instance</param>
/// <returns>The ConsumeResponse to determine whether to requeue, dead-letter (nack) or simply ack the message.</returns>
ConsumeResponse HandleException(IMessageContext context, Exception exception);
/// <param name="context">The exception strategy context containing the necessary data including the message context and the thrown exception.
/// Also the response to the message can be set.
/// If there is any other handling of the message than the expected default than HandlingResult.MessageFutureAction must be set accordingly. </param>
void HandleException(IExceptionStrategyContext context);
}
}

15
Tapeti/MessageFutureAction.cs Normal file
View File

@ -0,0 +1,15 @@
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Tapeti
{
public enum MessageAction
{
None = 1,
ErrorLog = 2,
Retry = 3,
}
}

5
Tapeti/Tapeti.csproj
View File

@ -53,6 +53,7 @@
<Reference Include="System.Xml" />
</ItemGroup>
<ItemGroup>
<Compile Include="Config\IExceptionStrategyContext.cs" />
<Compile Include="Config\ICleanupMiddleware.cs" />
<Compile Include="Config\IPublishContext.cs" />
<Compile Include="Config\IMessageFilterMiddleware.cs" />
@ -64,6 +65,9 @@
<Compile Include="Connection\TapetiWorker.cs" />
<Compile Include="Default\ConsoleLogger.cs" />
<Compile Include="Default\DevNullLogger.cs" />
<Compile Include="Default\ExceptionStrategyContext.cs" />
<Compile Include="Default\NackExceptionStrategy.cs" />
<Compile Include="HandlingResult.cs" />
<Compile Include="Default\JsonMessageSerializer.cs" />
<Compile Include="Default\MessageContext.cs" />
<Compile Include="Default\PublishResultBinding.cs" />
@ -84,6 +88,7 @@
<Compile Include="Config\IConfig.cs" />
<Compile Include="MessageController.cs" />
<Compile Include="Config\IBindingMiddleware.cs" />
<Compile Include="MessageFutureAction.cs" />
<Compile Include="TapetiAppSettingsConnectionParams.cs" />
<Compile Include="TapetiConnectionParams.cs" />
<Compile Include="TapetiConfig.cs" />

2
Tapeti/TapetiConfig.cs
View File

@ -143,7 +143,7 @@ namespace Tapeti
container.RegisterDefault<IMessageSerializer, JsonMessageSerializer>();
container.RegisterDefault<IExchangeStrategy, NamespaceMatchExchangeStrategy>();
container.RegisterDefault<IRoutingKeyStrategy, TypeNameRoutingKeyStrategy>();
container.RegisterDefault<IExceptionStrategy, RequeueExceptionStrategy>();
container.RegisterDefault<IExceptionStrategy, NackExceptionStrategy>();
}