Initial checkin of gRPC to third_party/

third_party/grpc/src/csharp/Grpc.Core/AsyncAuthInterceptor.cs

Index: third_party/grpc/src/csharp/Grpc.Core/AsyncAuthInterceptor.cs
diff --git a/third_party/protobuf/csharp/src/Google.Protobuf/Reflection/EnumValueDescriptor.cs b/third_party/grpc/src/csharp/Grpc.Core/AsyncAuthInterceptor.cs
similarity index 54%
copy from third_party/protobuf/csharp/src/Google.Protobuf/Reflection/EnumValueDescriptor.cs
copy to third_party/grpc/src/csharp/Grpc.Core/AsyncAuthInterceptor.cs
index b212ce961854ae40666196cbcc78b0ff2fcb0173..5ba06d6509741551f5c25f18cbd7be06c98e28a3 100644
--- a/third_party/protobuf/csharp/src/Google.Protobuf/Reflection/EnumValueDescriptor.cs
+++ b/third_party/grpc/src/csharp/Grpc.Core/AsyncAuthInterceptor.cs
@@ -1,7 +1,7 @@
 #region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2008 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
+
+// Copyright 2015-2016, Google Inc.
+// All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
@@ -28,43 +28,57 @@
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
 #endregion
 
-namespace Google.Protobuf.Reflection
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+using Grpc.Core.Internal;
+using Grpc.Core.Utils;
+
+namespace Grpc.Core
 {
     /// <summary>
-    /// Descriptor for a single enum value within an enum in a .proto file.
+    /// Asynchronous authentication interceptor for <see cref="CallCredentials"/>.
     /// </summary>
-    public sealed class EnumValueDescriptor : DescriptorBase                                            
-    {
-        private readonly EnumDescriptor enumDescriptor;
-        private readonly EnumValueDescriptorProto proto;
+    /// <param name="context">The interceptor context.</param>
+    /// <param name="metadata">Metadata to populate with entries that will be added to outgoing call's headers.</param>
+    /// <returns></returns>
+    public delegate Task AsyncAuthInterceptor(AuthInterceptorContext context, Metadata metadata);
 
-        internal EnumValueDescriptor(EnumValueDescriptorProto proto, FileDescriptor file,
-                                     EnumDescriptor parent, int index)
-            : base(file, parent.FullName + "." + proto.Name, index)
-        {
-            this.proto = proto;
-            enumDescriptor = parent;
-            file.DescriptorPool.AddSymbol(this);
-            file.DescriptorPool.AddEnumValueByNumber(this);
-        }
-
-        internal EnumValueDescriptorProto Proto { get { return proto; } }
+    /// <summary>
+    /// Context for an RPC being intercepted by <see cref="AsyncAuthInterceptor"/>.
+    /// </summary>
+    public class AuthInterceptorContext
+    {
+        readonly string serviceUrl;
+        readonly string methodName;
 
         /// <summary>
-        /// Returns the name of the enum value described by this object.
+        /// Initializes a new instance of <c>AuthInterceptorContext</c>.
         /// </summary>
-        public override string Name { get { return proto.Name; } }
+        public AuthInterceptorContext(string serviceUrl, string methodName)
+        {
+            this.serviceUrl = GrpcPreconditions.CheckNotNull(serviceUrl);
+            this.methodName = GrpcPreconditions.CheckNotNull(methodName);
+        }
 
         /// <summary>
-        /// Returns the number associated with this enum value.
+        /// The fully qualified service URL for the RPC being called.
         /// </summary>
-        public int Number { get { return Proto.Number; } }
+        public string ServiceUrl
+        {
+            get { return serviceUrl; }
+        }
 
         /// <summary>
-        /// Returns the enum descriptor that this value is part of.
+        /// The method name of the RPC being called.
         /// </summary>
-        public EnumDescriptor EnumDescriptor { get { return enumDescriptor; } }
+        public string MethodName
+        {
+            get { return methodName; }
+        }
     }
-}
+}