First pass at Grpc.StatusProto API

Grpc.DotNet.sln

@@ -140,6 +140,10 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Grpc.HealthCheck.Tests", "t
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Grpc.Reflection.Tests", "test\Grpc.Reflection.Tests\Grpc.Reflection.Tests.csproj", "{857C5B4B-E2A8-4ACA-98FB-5E592E2224CC}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Grpc.StatusProto", "src\Grpc.StatusProto\Grpc.StatusProto.csproj", "{C01E4F44-9AB0-4478-A453-C88CCB49A4F1}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Grpc.StatusProto.Tests", "test\Grpc.StatusProto.Tests\Grpc.StatusProto.Tests.csproj", "{E49FA5BF-4D67-4C95-9543-8E9FCEAF3609}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -302,6 +306,14 @@ Global
 		{857C5B4B-E2A8-4ACA-98FB-5E592E2224CC}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{857C5B4B-E2A8-4ACA-98FB-5E592E2224CC}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{857C5B4B-E2A8-4ACA-98FB-5E592E2224CC}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C01E4F44-9AB0-4478-A453-C88CCB49A4F1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C01E4F44-9AB0-4478-A453-C88CCB49A4F1}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C01E4F44-9AB0-4478-A453-C88CCB49A4F1}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C01E4F44-9AB0-4478-A453-C88CCB49A4F1}.Release|Any CPU.Build.0 = Release|Any CPU
+		{E49FA5BF-4D67-4C95-9543-8E9FCEAF3609}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E49FA5BF-4D67-4C95-9543-8E9FCEAF3609}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E49FA5BF-4D67-4C95-9543-8E9FCEAF3609}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E49FA5BF-4D67-4C95-9543-8E9FCEAF3609}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -355,6 +367,8 @@ Global
 		{B4153E7F-5CF3-4DFB-A9D1-5E77A2FB2C48} = {8C62055F-8CD7-4859-9001-634D544DF2AE}
 		{25544326-C145-4D05-A4C3-AC7D59E17196} = {CECC4AE8-9C4E-4727-939B-517CC2E58D65}
 		{857C5B4B-E2A8-4ACA-98FB-5E592E2224CC} = {CECC4AE8-9C4E-4727-939B-517CC2E58D65}
+		{C01E4F44-9AB0-4478-A453-C88CCB49A4F1} = {8C62055F-8CD7-4859-9001-634D544DF2AE}
+		{E49FA5BF-4D67-4C95-9543-8E9FCEAF3609} = {CECC4AE8-9C4E-4727-939B-517CC2E58D65}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {CD5C2B19-49B4-480A-990C-36D98A719B07}

build/dependencies.props

@@ -1,6 +1,7 @@
 <Project>
   <PropertyGroup>
     <BenchmarkDotNetPackageVersion>0.13.1</BenchmarkDotNetPackageVersion>
+    <GoogleApiCommonProtosPackageVersion>2.10.0</GoogleApiCommonProtosPackageVersion>
     <GoogleApisAuthPackageVersion>1.46.0</GoogleApisAuthPackageVersion>
     <GoogleProtobufPackageVersion>3.23.1</GoogleProtobufPackageVersion>
     <GrpcDotNetPackageVersion>2.55.0</GrpcDotNetPackageVersion>  <!-- Used by example projects -->

src/Grpc.StatusProto/ExceptionExtensions.cs

@@ -0,0 +1,105 @@
+// Copyright 2023 gRPC authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+using Google.Rpc;
+using Grpc.Shared;
+
+namespace Grpc.StatusProto;
+
+/// <summary>
+/// Extensions methods for <see cref="System.Exception"/>
+/// </summary>
+public static class ExceptionExtensions
+{
+    /// <summary>
+    /// Create a <see cref="Google.Rpc.DebugInfo"/> from an <see cref="System.Exception"/>,
+    /// populating the Message and StackTrace from the exception.
+    /// Note: experimental API that can change or be removed without any prior notice.
+    /// </summary>
+    /// <remarks>
+    /// <example>
+    /// For example:
+    /// <code>
+    /// try { /* ... */
+    /// }
+    /// catch (Exception e) {
+    ///    Google.Rpc.Status status = new() {
+    ///        Code = (int)StatusCode.Internal,
+    ///        Message = "Internal error",
+    ///        Details = {
+    ///            // populate debugInfo from the exception
+    ///            Any.Pack(e.ToRpcDebugInfo())
+    ///        }
+    ///    };
+    ///    // ...
+    /// }
+    /// </code>
+    /// </example>
+    /// </remarks>
+    /// <param name="exception"></param>
+    /// <param name="innerDepth">Maximum number of inner exceptions to include in the StackTrace. Defaults
+    /// to not including any inner exceptions</param>
+    /// <returns>
+    /// A new <see cref="Google.Rpc.DebugInfo"/> populated from the exception.
+    /// </returns>
+    public static DebugInfo ToRpcDebugInfo(this Exception exception, int innerDepth = 0)
+    {
+        ArgumentNullThrowHelper.ThrowIfNull(exception);
+
+        var debugInfo = new DebugInfo();
+
+        var message = exception.Message;
+        var name = exception.GetType().FullName;
+
+        // Populate the Detail from the exception type and message
+        debugInfo.Detail = message is null ? name : name + ": " + message;
+
+        // Populate the StackEntries from the exception StackTrace
+        if (exception.StackTrace is not null)
+        {
+            var sr = new StringReader(exception.StackTrace);
+            var entry = sr.ReadLine();
+            while (entry is not null)
+            {
+                debugInfo.StackEntries.Add(entry);
+                entry = sr.ReadLine();
+            }
+        }
+
+        // Add inner exceptions to the StackEntries
+        var inner = exception.InnerException;
+        while (innerDepth > 0 && inner is not null)
+        {
+            message = inner.Message;
+            name = inner.GetType().FullName;
+            debugInfo.StackEntries.Add("InnerException: " + (message is null ? name : name + ": " + message));
+
+            if (inner.StackTrace is not null)
+            {
+                var sr = new StringReader(inner.StackTrace);
+                var entry = sr.ReadLine();
+                while (entry is not null)
+                {
+                    debugInfo.StackEntries.Add(entry);
+                    entry = sr.ReadLine();
+                }
+            }
+
+            inner = inner.InnerException;
+            --innerDepth;
+        }
+
+        return debugInfo;
+    }
+}

src/Grpc.StatusProto/Grpc.StatusProto.csproj

@@ -0,0 +1,29 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <Description>gRPC C# API for error handling using google/rpc/status.proto</Description>
+    <PackageTags>gRPC RPC HTTP/2</PackageTags>
+
+    <IsGrpcPublishedPackage>true</IsGrpcPublishedPackage>
+    <GenerateDocumentationFile>true</GenerateDocumentationFile>
+    <TargetFrameworks>net462;netstandard2.0;netstandard2.1</TargetFrameworks>
+    <PackageReadmeFile>README.md</PackageReadmeFile>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Google.Api.CommonProtos" Version="$(GoogleApiCommonProtosPackageVersion)" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Include="README.md" Pack="true" PackagePath="\" />
+
+    <Compile Include="..\Shared\NullableAttributes.cs" Link="Internal\NullableAttributes.cs" />
+    <Compile Include="..\Shared\CallerArgumentExpressionAttribute.cs" Link="Internal\CallerArgumentExpressionAttribute.cs" />
+    <Compile Include="..\Shared\ThrowHelpers\ArgumentNullThrowHelper.cs" Link="Internal\ArgumentNullThrowHelper.cs" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Grpc.Core.Api\Grpc.Core.Api.csproj" />
+  </ItemGroup>
+
+</Project>

src/Grpc.StatusProto/MetadataExtensions.cs

@@ -0,0 +1,83 @@
+// Copyright 2023 gRPC authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+using Google.Protobuf;
+using Grpc.Core;
+using Grpc.Shared;
+
+namespace Grpc.StatusProto;
+
+/// <summary>
+/// Extension methods for the Grpc.Core.Metadata
+/// </summary>
+public static class MetadataExtensions
+{
+    /// <summary>
+    /// Name of key in the metadata for the binary encoding of
+    /// <see cref="Google.Rpc.Status"/>
+    /// </summary>
+    public const string StatusDetailsTrailerName = "grpc-status-details-bin";
+
+    /// <summary>
+    /// Get the <see cref="Google.Rpc.Status"/> from the metadata.
+    /// Note: experimental API that can change or be removed without any prior notice.
+    /// </summary>
+    /// <param name="metadata"></param>
+    /// <param name="throwOnParseError">if true then <see cref="Google.Protobuf.InvalidProtocolBufferException"/>
+    /// is thrown if the metadata cannot be parsed. Otherwise null is returned on a parsing error.</param>
+    /// <returns>
+    /// The found <see cref="Google.Rpc.Status"/> or null if it was
+    /// not present or could the data could not be parsed.
+    /// </returns>
+    public static Google.Rpc.Status? GetRpcStatus(this Metadata metadata, bool throwOnParseError = false)
+    {
+        ArgumentNullThrowHelper.ThrowIfNull(metadata);
+
+        var entry = metadata.Get(StatusDetailsTrailerName);
+        if (entry is null)
+        {
+            return null;
+        }
+        try
+        {
+            return Google.Rpc.Status.Parser.ParseFrom(entry.ValueBytes);
+        }
+        catch when (!throwOnParseError)
+        {
+            // By default if the message is malformed, just report there's no information.
+            return null;
+        }
+    }
+
+    /// <summary>
+    /// Add <see cref="Google.Rpc.Status"/> to the metadata.
+    /// Any existing status in the metadata will be overwritten.
+    /// Note: experimental API that can change or be removed without any prior notice.
+    /// </summary>
+    /// <param name="metadata"></param>
+    /// <param name="status">Status to add</param>
+    public static void SetRpcStatus(this Metadata metadata, Google.Rpc.Status status)
+    {
+        ArgumentNullThrowHelper.ThrowIfNull(metadata);
+        ArgumentNullThrowHelper.ThrowIfNull(status);
+
+        var entry = metadata.Get(StatusDetailsTrailerName);
+        while (entry is not null)
+        {
+            metadata.Remove(entry);
+            entry = metadata.Get(StatusDetailsTrailerName);
+        }
+        metadata.Add(StatusDetailsTrailerName, status.ToByteArray());
+    }
+}