Blueprint: Unregister API delegating handler (#14200)

* Update blueprint client to unregister api handler

* Update change log

* Use initial client design where we create seperate clients based on whether delegating handler is used. This works better with piping scenarios

* New and set artifact cmdlets don't require bp client with $expand handler

* Clean white space

* Clean up more white space

Author: filizt

src/Blueprint/Blueprint.sln

@@ -1,4 +1,3 @@
-
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 15
 VisualStudioVersion = 15.0.27703.2042
@@ -45,6 +44,10 @@ Global
 		{142D7B0B-388A-4CEB-A228-7F6D423C5C2E}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{142D7B0B-388A-4CEB-A228-7F6D423C5C2E}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{142D7B0B-388A-4CEB-A228-7F6D423C5C2E}.Release|Any CPU.Build.0 = Release|Any CPU
+		{6BD6B80A-06AF-4B5B-9230-69CCFC6C8D64}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6BD6B80A-06AF-4B5B-9230-69CCFC6C8D64}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6BD6B80A-06AF-4B5B-9230-69CCFC6C8D64}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6BD6B80A-06AF-4B5B-9230-69CCFC6C8D64}.Release|Any CPU.Build.0 = Release|Any CPU
 		{FF81DC73-B8EC-4082-8841-4FBF2B16E7CE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{FF81DC73-B8EC-4082-8841-4FBF2B16E7CE}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{FF81DC73-B8EC-4082-8841-4FBF2B16E7CE}.Release|Any CPU.ActiveCfg = Release|Any CPU

src/Blueprint/Blueprint/ChangeLog.md

@@ -18,6 +18,7 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* Added a fix to unregister the API delegating handler from blueprint client
 
 ## Version 0.2.13
 * Updated Blueprint .NET SDK version

src/Blueprint/Blueprint/Cmdlets/BlueprintArtifacts/NewAzureRMBlueprintArtifact.cs

@@ -185,7 +185,7 @@ public override void ExecuteCmdlet()
                                 DependsOn = DependsOn
                             };
 
-                            WriteObject(BlueprintClientWithVersion.CreateArtifact(scope, Blueprint.Name, Name,
+                            WriteObject(BlueprintClient.CreateArtifact(scope, Blueprint.Name, Name,
                                 templateArtifact));
                         }
 

src/Blueprint/Blueprint/Cmdlets/BlueprintArtifacts/SetAzureRMBlueprintArtifact.cs

@@ -185,7 +185,7 @@ public override void ExecuteCmdlet()
                                 DependsOn = DependsOn
                             };
 
-                            WriteObject(BlueprintClientWithVersion.CreateArtifact(scope, Blueprint.Name, Name,
+                            WriteObject(BlueprintClient.CreateArtifact(scope, Blueprint.Name, Name,
                                 templateArtifact));
                         }
 

src/Blueprint/Blueprint/Cmdlets/BlueprintCmdletBase.cs

@@ -25,6 +25,7 @@
 using Microsoft.WindowsAzure.Commands.Utilities.Common;
 using Provider = Microsoft.Azure.Management.Internal.ResourceManager.Version2018_05_01.Models.Provider;
 using System.Linq;
+using System.Net.Http;
 
 namespace Microsoft.Azure.Commands.Blueprint.Cmdlets
 {
@@ -208,5 +209,27 @@ protected string GetValidatedFolderPathForArtifacts(string path)
 
             return artifactsFolderName == null ? null : Path.Combine(path, artifactsFolderName);
         }
+
+        /// <summary>
+        /// Unregisters delegating handler if registered.  
+        /// </summary>
+        protected void UnregisterDelegatingHandlerIfRegistered()
+        {
+            var apiExpandHandler = GetExpandHandler();
+
+            if (apiExpandHandler != null)
+            {
+                AzureSession.Instance.ClientFactory.RemoveHandler(apiExpandHandler.GetType());
+            }
+        }
+
+        /// <summary>
+        /// Returns expand handler, if exists.  
+        /// </summary>
+        private DelegatingHandler GetExpandHandler()
+        {
+            return AzureSession.Instance.ClientFactory.GetCustomHandlers()?
+                .Where(handler => handler.GetType().Equals(typeof(ApiExpandHandler))).FirstOrDefault();
+        }
     }
 }

src/Blueprint/Blueprint/Cmdlets/BlueprintDefinition/GetAzureRMBlueprint.cs

@@ -107,6 +107,10 @@ public override void ExecuteCmdlet()
             {
                 WriteExceptionError(ex);
             }
+            finally
+            {
+                UnregisterDelegatingHandlerIfRegistered();
+            }
         }
         #endregion Cmdlet Overrides
 

src/Blueprint/Blueprint/Common/BlueprintClient.cs

@@ -42,7 +42,7 @@ public BlueprintClient(IAzureContext context)
             var customHandlers = AzureSession.Instance.ClientFactory.GetCustomHandlers();
             var apiExpandHandler = customHandlers?.Where(handler => handler.GetType().Equals(typeof(ApiExpandHandler))).FirstOrDefault();
 
-            if (apiExpandHandler != null )
+            if (apiExpandHandler != null)
             {
                 AzureSession.Instance.ClientFactory.RemoveHandler(apiExpandHandler.GetType());
             }