[Release 1.1] Revert Async changes in SNIPacket to fix deadlock issues + Update SNI Package Reference (#425)

Author: cheenamalhotra

README.md

@@ -28,10 +28,6 @@ For the .NET Framework driver on Windows, a package reference to [Microsoft.Data
 
 For the .NET Core driver on Windows, a package reference to [runtime.native.System.Data.SqlClient.sni](https://www.nuget.org/packages/runtime.native.System.Data.SqlClient.sni/) loads `arm64`, `x64` and `x86` native `SNI.dll` libraries into the client's build directories.
 
-**Note**
-When referencing the native `SNI.dll` on Windows, the Microsoft Visual C++ Redistributable is required to be installed: [The latest supported Visual C++ downloads](https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads)
-
-
 ## Helpful Links
 
 | Topic | Link to File |

src/Microsoft.Data.SqlClient/netcore/src/Microsoft.Data.SqlClient.csproj

@@ -44,7 +44,6 @@
     <Compile Include="Microsoft\Data\SqlClient\EnclaveDelegate.NetCoreApp.cs" />
     <Compile Include="Microsoft\Data\SqlClient\SqlDelegatedTransaction.NetCoreApp.cs" />
     <Compile Include="Microsoft\Data\SqlClient\TdsParser.NetCoreApp.cs" />
-    <Compile Include="Microsoft\Data\SqlClient\SNI\SNIPacket.NetCoreApp.cs" />
     <Compile Include="Microsoft\Data\SqlClient\AzureAttestationBasedEnclaveProvider.NetCoreApp.cs" />
     <Compile Include="Microsoft\Data\SqlClient\VirtualSecureModeEnclaveProvider.NetCoreApp.cs" />
     <Compile Include="Microsoft\Data\SqlClient\VirtualSecureModeEnclaveProviderBase.NetCoreApp.cs" />
@@ -56,7 +55,6 @@
   <ItemGroup Condition="'$(IsPartialFacadeAssembly)' != 'true' AND '$(OSGroup)' != 'AnyOS' AND '$(TargetGroup)' == 'netstandard'">
     <Compile Include="Microsoft\Data\SqlClient\SqlDelegatedTransaction.NetStandard.cs" />
     <Compile Include="Microsoft\Data\SqlClient\TdsParser.NetStandard.cs" />
-    <Compile Include="Microsoft\Data\SqlClient\SNI\SNIPacket.NetStandard.cs" />
   </ItemGroup>
   <ItemGroup Condition="'$(IsPartialFacadeAssembly)' != 'true' AND '$(OSGroup)' != 'AnyOS'">    
     <Compile Include="Microsoft\Data\SqlClient\Server\ITypedGetters.cs" />

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SNI/SNIPacket.NetCoreApp.cs

@@ -5,13 +5,15 @@
 using System;
 using System.Buffers;
 using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace Microsoft.Data.SqlClient.SNI
 {
     /// <summary>
     /// SNI Packet
     /// </summary>
-    internal partial class SNIPacket : IDisposable, IEquatable<SNIPacket>
+    internal class SNIPacket : IDisposable, IEquatable<SNIPacket>
     {
         private byte[] _data;
         private int _length;
@@ -251,6 +253,46 @@ public void ReadFromStream(Stream stream)
             _length = stream.Read(_data, 0, _capacity);
         }
 
+        /// <summary>
+        /// Read data from a stream asynchronously
+        /// </summary>
+        /// <param name="stream">Stream to read from</param>
+        /// <param name="callback">Completion callback</param>
+        public void ReadFromStreamAsync(Stream stream, SNIAsyncCallback callback)
+        {
+            bool error = false;
+
+            stream.ReadAsync(_data, 0, _capacity, CancellationToken.None).ContinueWith(t =>
+            {
+                Exception e = t.Exception?.InnerException;
+                if (e != null)
+                {
+                    SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.TCP_PROV, SNICommon.InternalExceptionError, e);
+                    error = true;
+                }
+                else
+                {
+                    _length = t.Result;
+
+                    if (_length == 0)
+                    {
+                        SNILoadHandle.SingletonInstance.LastError = new SNIError(SNIProviders.TCP_PROV, 0, SNICommon.ConnTerminatedError, string.Empty);
+                        error = true;
+                    }
+                }
+
+                if (error)
+                {
+                    Release();
+                }
+
+                callback(this, error ? TdsEnums.SNI_ERROR : TdsEnums.SNI_SUCCESS);
+            },
+            CancellationToken.None,
+            TaskContinuationOptions.DenyChildAttach,
+            TaskScheduler.Default);
+        }
+
         /// <summary>
         /// Write data to a stream synchronously
         /// </summary>
@@ -260,6 +302,33 @@ public void WriteToStream(Stream stream)
             stream.Write(_data, 0, _length);
         }
 
+        /// <summary>
+        /// Write data to a stream asynchronously
+        /// </summary>
+        /// <param name="stream">Stream to write to</param>
+        /// <param name="callback">SNI Asynchronous Callback</param>
+        /// <param name="provider">SNI provider identifier</param>
+        /// <param name="disposeAfterWriteAsync">Bool flag to decide whether or not to dispose after Write Async operation</param>
+        public async void WriteToStreamAsync(Stream stream, SNIAsyncCallback callback, SNIProviders provider, bool disposeAfterWriteAsync = false)
+        {
+            uint status = TdsEnums.SNI_SUCCESS;
+            try
+            {
+                await stream.WriteAsync(_data, 0, _length, CancellationToken.None).ConfigureAwait(false);
+            }
+            catch (Exception e)
+            {
+                SNILoadHandle.SingletonInstance.LastError = new SNIError(provider, SNICommon.InternalExceptionError, e);
+                status = TdsEnums.SNI_ERROR;
+            }
+            callback(this, status);
+
+            if (disposeAfterWriteAsync)
+            {
+                Dispose();
+            }
+        }
+
         /// <summary>
         /// Get hash code
         /// </summary>

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/SNI/SNIPacket.NetStandard.cs

@@ -84,7 +84,6 @@
   </ItemGroup>
   <ItemGroup>
     <None Include="Microsoft.Data.SqlClientKey.snk" />
-    <None Include="packages.config" />
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Microsoft\Data\Interop\SNINativeMethodWrapper.cs" />
@@ -340,8 +339,14 @@
     </COMReference>
   </ItemGroup>
   <ItemGroup>
+    <PackageReference Include="System.Security.Cryptography.Algorithms">
+      <Version>4.3.1</Version>
+    </PackageReference>
+    <PackageReference Include="System.Security.Cryptography.Primitives">
+      <Version>4.3.0</Version>
+    </PackageReference>
     <PackageReference Include="Microsoft.Data.SqlClient.SNI">
-      <Version>1.1.0</Version>
+      <Version>[1.1.0,1.2.0)</Version>
     </PackageReference>
     <PackageReference Include="Microsoft.Identity.Client">
       <Version>3.0.8</Version>