Prevent ProgressMessageTarget from ever reading the command from the database.

src/NzbDrone.Api/Commands/CommandModule.cs

@@ -62,7 +62,7 @@ namespace NzbDrone.Api.Commands
         {
             if (message.Command.Body.SendUpdatesToClient)
             {
-                BroadcastResourceChange(ModelAction.Updated, message.Command.Id);
+                BroadcastResourceChange(ModelAction.Updated, message.Command.InjectTo<CommandResource>());
             }
         }
     }

src/NzbDrone.Core/Messaging/Commands/CommandExecutor.cs

@@ -69,9 +69,9 @@ namespace NzbDrone.Core.Messaging.Commands
                 _commandQueueManager.Start(commandModel);
                 BroadcastCommandUpdate(commandModel);
 
-                if (!MappedDiagnosticsContext.Contains("CommandId"))
+                if (ProgressMessageContext.CommandModel == null)
                 {
-                    MappedDiagnosticsContext.Set("CommandId", commandModel.Id.ToString());
+                    ProgressMessageContext.CommandModel = commandModel;
                 }
 
                 handler.Execute(command);
@@ -96,9 +96,9 @@ namespace NzbDrone.Core.Messaging.Commands
 
                 _eventAggregator.PublishEvent(new CommandExecutedEvent(commandModel));
 
-                if (MappedDiagnosticsContext.Get("CommandId") == commandModel.Id.ToString())
+                if (ProgressMessageContext.CommandModel == commandModel)
                 {
-                    MappedDiagnosticsContext.Remove("CommandId");
+                    ProgressMessageContext.CommandModel = null;
                 }
             }
 

src/NzbDrone.Core/Messaging/Commands/CommandQueueManager.cs

@@ -80,8 +80,8 @@ namespace NzbDrone.Core.Messaging.Commands
             _logger.Trace("Inserting new command: {0}", commandModel.Name);
 
             _repo.Insert(commandModel);
-            _commandQueue.Add(commandModel);
             _commandCache.Set(commandModel.Id.ToString(), commandModel);
+            _commandQueue.Add(commandModel);
 
             return commandModel;
         }

src/NzbDrone.Core/NzbDrone.Core.csproj

@@ -717,6 +717,7 @@
     <Compile Include="Profiles\Delay\DelayProfileService.cs" />
     <Compile Include="Profiles\Delay\DelayProfileTagInUseValidator.cs" />
     <Compile Include="Profiles\ProfileRepository.cs" />
+    <Compile Include="ProgressMessaging\ProgressMessageContext.cs" />
     <Compile Include="Qualities\Revision.cs" />
     <Compile Include="RemotePathMappings\RemotePathMapping.cs" />
     <Compile Include="RemotePathMappings\RemotePathMappingRepository.cs" />

src/NzbDrone.Core/ProgressMessaging/ProgressMessageContext.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using NzbDrone.Core.Messaging.Commands;
+
+namespace NzbDrone.Core.ProgressMessaging
+{
+    public static class ProgressMessageContext
+    {
+        [ThreadStatic]
+        private static CommandModel _commandModel;
+
+        [ThreadStatic]
+        private static bool _reentrancyLock;
+        
+        public static CommandModel CommandModel
+        {
+            get { return _commandModel; }
+            set { _commandModel = value; }
+        }
+
+        public static bool LockReentrancy()
+        {
+            if (_reentrancyLock)
+                return false;
+
+            _reentrancyLock = true;
+            return true;
+        }
+
+        public static void UnlockReentrancy()
+        {
+            _reentrancyLock = false;
+        }
+    }
+}

src/NzbDrone.Core/ProgressMessaging/ProgressMessageTarget.cs

@@ -15,8 +15,6 @@ namespace NzbDrone.Core.ProgressMessaging
         private readonly IManageCommandQueue _commandQueueManager;
         private static LoggingRule _rule;
 
-        private const string REENTRY_LOCK = "ProgressMessagingLock";
-
         public ProgressMessageTarget(IEventAggregator eventAggregator, IManageCommandQueue commandQueueManager)
         {
             _eventAggregator = eventAggregator;
@@ -25,29 +23,20 @@ namespace NzbDrone.Core.ProgressMessaging
 
         protected override void Write(LogEventInfo logEvent)
         {
-            if (!ReentryPreventionCheck()) return;
+            var command = ProgressMessageContext.CommandModel;
 
-            var command = GetCurrentCommand();
+            if (!IsClientMessage(logEvent, command)) return;
             
-            if (IsClientMessage(logEvent, command))
+            if (!ProgressMessageContext.LockReentrancy()) return;
+            try
             {
                 _commandQueueManager.SetMessage(command, logEvent.FormattedMessage);
                 _eventAggregator.PublishEvent(new CommandUpdatedEvent(command));
             }
-
-            MappedDiagnosticsContext.Remove(REENTRY_LOCK);
-        }
-
-        private CommandModel GetCurrentCommand()
-        {
-            var commandId = MappedDiagnosticsContext.Get("CommandId");
-
-            if (String.IsNullOrWhiteSpace(commandId))
+            finally
             {
-                return null;
+                ProgressMessageContext.UnlockReentrancy();
             }
-
-            return _commandQueueManager.Get(Convert.ToInt32(commandId));
         }
 
         private bool IsClientMessage(LogEventInfo logEvent, CommandModel command)
@@ -60,20 +49,6 @@ namespace NzbDrone.Core.ProgressMessaging
             return logEvent.Properties.ContainsKey("Status");
         }
 
-        private bool ReentryPreventionCheck()
-        {
-            var reentryLock = MappedDiagnosticsContext.Get(REENTRY_LOCK);
-            var commandId = MappedDiagnosticsContext.Get("CommandId");
-
-            if (reentryLock.IsNullOrWhiteSpace() || reentryLock != commandId)
-            {
-                MappedDiagnosticsContext.Set(REENTRY_LOCK, MappedDiagnosticsContext.Get("CommandId"));
-                return true;
-            }
-
-            return false;
-        }
-
         public void Handle(ApplicationStartedEvent message)
         {
             _rule = new LoggingRule("*", LogLevel.Trace, this);