Move InterceptingCallInvoker to its own file

src/csharp/Grpc.Core/Interceptors/CallInvokerExtensions.cs

@@ -28,123 +28,6 @@ namespace Grpc.Core.Interceptors
     /// </summary>
     public static class CallInvokerExtensions
     {
-        /// <summary>
-        /// Decorates an underlying <see cref="Grpc.Core.CallInvoker" /> to
-        /// intercept calls through a given interceptor.
-        /// </summary>
-        private class InterceptingCallInvoker : CallInvoker
-        {
-            readonly CallInvoker invoker;
-            readonly Interceptor interceptor;
-
-            /// <summary>
-            /// Creates a new instance of <see cref="Grpc.Core.Interceptors.CallInvokerExtensions.InterceptingCallInvoker" />
-            /// with the given underlying invoker and interceptor instances.
-            /// </summary>
-            public InterceptingCallInvoker(CallInvoker invoker, Interceptor interceptor)
-            {
-                this.invoker = GrpcPreconditions.CheckNotNull(invoker, "invoker");
-                this.interceptor = GrpcPreconditions.CheckNotNull(interceptor, "interceptor");
-            }
-
-            /// <summary>
-            /// Intercepts a simple blocking call with the registered interceptor.
-            /// </summary>
-            public override TResponse BlockingUnaryCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options, TRequest request)
-            {
-                return interceptor.BlockingUnaryCall(
-                    request,
-                    new ClientInterceptorContext<TRequest, TResponse>(method, host, options),
-                    (req, ctx) => invoker.BlockingUnaryCall(ctx.Method, ctx.Host, ctx.Options, req));
-            }
-
-            /// <summary>
-            /// Intercepts a simple asynchronous call with the registered interceptor.
-            /// </summary>
-            public override AsyncUnaryCall<TResponse> AsyncUnaryCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options, TRequest request)
-            {
-                return interceptor.AsyncUnaryCall(
-                    request,
-                    new ClientInterceptorContext<TRequest, TResponse>(method, host, options),
-                    (req, ctx) => invoker.AsyncUnaryCall(ctx.Method, ctx.Host, ctx.Options, req));
-            }
-
-            /// <summary>
-            /// Intercepts an asynchronous server streaming call with the registered interceptor.
-            /// </summary>
-            public override AsyncServerStreamingCall<TResponse> AsyncServerStreamingCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options, TRequest request)
-            {
-                return interceptor.AsyncServerStreamingCall(
-                    request,
-                    new ClientInterceptorContext<TRequest, TResponse>(method, host, options),
-                    (req, ctx) => invoker.AsyncServerStreamingCall(ctx.Method, ctx.Host, ctx.Options, req));
-            }
-
-            /// <summary>
-            /// Intercepts an asynchronous client streaming call with the registered interceptor.
-            /// </summary>
-            public override AsyncClientStreamingCall<TRequest, TResponse> AsyncClientStreamingCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options)
-            {
-                return interceptor.AsyncClientStreamingCall(
-                    new ClientInterceptorContext<TRequest, TResponse>(method, host, options),
-                    ctx => invoker.AsyncClientStreamingCall(ctx.Method, ctx.Host, ctx.Options));
-            }
-
-            /// <summary>
-            /// Intercepts an asynchronous duplex streaming call with the registered interceptor.
-            /// </summary>
-            public override AsyncDuplexStreamingCall<TRequest, TResponse> AsyncDuplexStreamingCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options)
-            {
-                return interceptor.AsyncDuplexStreamingCall(
-                    new ClientInterceptorContext<TRequest, TResponse>(method, host, options),
-                    ctx => invoker.AsyncDuplexStreamingCall(ctx.Method, ctx.Host, ctx.Options));
-            }
-        }
-
-        private class MetadataInterceptor : GenericInterceptor
-        {
-            readonly Func<Metadata, Metadata> interceptor;
-
-            /// <summary>
-            /// Creates a new instance of MetadataInterceptor given the specified interceptor function.
-            /// </summary>
-            public MetadataInterceptor(Func<Metadata, Metadata> interceptor)
-            {
-                this.interceptor = GrpcPreconditions.CheckNotNull(interceptor, "interceptor");
-            }
-
-            protected override ClientCallHooks<TRequest, TResponse> InterceptCall<TRequest, TResponse>(ClientInterceptorContext<TRequest, TResponse> context, bool clientStreaming, bool serverStreaming, TRequest request)
-            {
-                var metadata = context.Options.Headers ?? new Metadata();
-                return new ClientCallHooks<TRequest, TResponse>
-                {
-                    ContextOverride = new ClientInterceptorContext<TRequest, TResponse>(context.Method, context.Host, context.Options.WithHeaders(interceptor(metadata))),
-                };
-            }
-        }
-
-        /// <summary>
-        /// Returns a <see cref="Grpc.Core.CallInvoker" /> instance that intercepts
-        /// the invoker with the given interceptor.
-        /// </summary>
-        /// <param name="invoker">The underlying invoker to intercept.</param>
-        /// <param name="interceptor">
-        /// An interceptor delegate that takes the request metadata to be sent with an outgoing call
-        /// and returns a <see cref="Grpc.Core.Metadata" /> instance that will replace the existing
-        /// invocation metadata.
-        /// </param>
-        /// <remarks>
-        /// Multiple interceptors can be added on top of each other by calling
-        /// "invoker.Intercept(a, b, c)".  The order of invocation will be "a", "b", and then "c".
-        /// Interceptors can be later added to an existing intercepted CallInvoker, effectively
-        /// building a chain like "invoker.Intercept(c).Intercept(b).Intercept(a)".  Note that
-        /// in this case, the last interceptor added will be the first to take control.
-        /// </remarks>
-        public static CallInvoker Intercept(this CallInvoker invoker, Func<Metadata, Metadata> interceptor)
-        {
-            return new InterceptingCallInvoker(invoker, new MetadataInterceptor(interceptor));
-        }
-
         /// <summary>
         /// Returns a <see cref="Grpc.Core.CallInvoker" /> instance that intercepts
         /// the invoker with the given interceptor.
@@ -191,5 +74,47 @@ namespace Grpc.Core.Interceptors
 
             return invoker;
         }
+
+        /// <summary>
+        /// Returns a <see cref="Grpc.Core.CallInvoker" /> instance that intercepts
+        /// the invoker with the given interceptor.
+        /// </summary>
+        /// <param name="invoker">The underlying invoker to intercept.</param>
+        /// <param name="interceptor">
+        /// An interceptor delegate that takes the request metadata to be sent with an outgoing call
+        /// and returns a <see cref="Grpc.Core.Metadata" /> instance that will replace the existing
+        /// invocation metadata.
+        /// </param>
+        /// <remarks>
+        /// Multiple interceptors can be added on top of each other by
+        /// building a chain like "invoker.Intercept(c).Intercept(b).Intercept(a)".  Note that
+        /// in this case, the last interceptor added will be the first to take control.
+        /// </remarks>
+        public static CallInvoker Intercept(this CallInvoker invoker, Func<Metadata, Metadata> interceptor)
+        {
+            return new InterceptingCallInvoker(invoker, new MetadataInterceptor(interceptor));
+        }
+
+        private class MetadataInterceptor : GenericInterceptor
+        {
+            readonly Func<Metadata, Metadata> interceptor;
+
+            /// <summary>
+            /// Creates a new instance of MetadataInterceptor given the specified interceptor function.
+            /// </summary>
+            public MetadataInterceptor(Func<Metadata, Metadata> interceptor)
+            {
+                this.interceptor = GrpcPreconditions.CheckNotNull(interceptor, "interceptor");
+            }
+
+            protected override ClientCallHooks<TRequest, TResponse> InterceptCall<TRequest, TResponse>(ClientInterceptorContext<TRequest, TResponse> context, bool clientStreaming, bool serverStreaming, TRequest request)
+            {
+                var metadata = context.Options.Headers ?? new Metadata();
+                return new ClientCallHooks<TRequest, TResponse>
+                {
+                    ContextOverride = new ClientInterceptorContext<TRequest, TResponse>(context.Method, context.Host, context.Options.WithHeaders(interceptor(metadata))),
+                };
+            }
+        }
     }
 }

src/csharp/Grpc.Core/Interceptors/InterceptingCallInvoker.cs

@@ -0,0 +1,96 @@
+#region Copyright notice and license
+
+// Copyright 2018 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.
+
+#endregion
+
+using System;
+using Grpc.Core.Utils;
+
+namespace Grpc.Core.Interceptors
+{
+    /// <summary>
+    /// Decorates an underlying <see cref="Grpc.Core.CallInvoker" /> to
+    /// intercept calls through a given interceptor.
+    /// </summary>
+    internal class InterceptingCallInvoker : CallInvoker
+    {
+        readonly CallInvoker invoker;
+        readonly Interceptor interceptor;
+
+        /// <summary>
+        /// Creates a new instance of <see cref="Grpc.Core.Interceptors.InterceptingCallInvoker" />
+        /// with the given underlying invoker and interceptor instances.
+        /// </summary>
+        public InterceptingCallInvoker(CallInvoker invoker, Interceptor interceptor)
+        {
+            this.invoker = GrpcPreconditions.CheckNotNull(invoker, "invoker");
+            this.interceptor = GrpcPreconditions.CheckNotNull(interceptor, "interceptor");
+        }
+
+        /// <summary>
+        /// Intercepts a simple blocking call with the registered interceptor.
+        /// </summary>
+        public override TResponse BlockingUnaryCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options, TRequest request)
+        {
+            return interceptor.BlockingUnaryCall(
+                request,
+                new ClientInterceptorContext<TRequest, TResponse>(method, host, options),
+                (req, ctx) => invoker.BlockingUnaryCall(ctx.Method, ctx.Host, ctx.Options, req));
+        }
+
+        /// <summary>
+        /// Intercepts a simple asynchronous call with the registered interceptor.
+        /// </summary>
+        public override AsyncUnaryCall<TResponse> AsyncUnaryCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options, TRequest request)
+        {
+            return interceptor.AsyncUnaryCall(
+                request,
+                new ClientInterceptorContext<TRequest, TResponse>(method, host, options),
+                (req, ctx) => invoker.AsyncUnaryCall(ctx.Method, ctx.Host, ctx.Options, req));
+        }
+
+        /// <summary>
+        /// Intercepts an asynchronous server streaming call with the registered interceptor.
+        /// </summary>
+        public override AsyncServerStreamingCall<TResponse> AsyncServerStreamingCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options, TRequest request)
+        {
+            return interceptor.AsyncServerStreamingCall(
+                request,
+                new ClientInterceptorContext<TRequest, TResponse>(method, host, options),
+                (req, ctx) => invoker.AsyncServerStreamingCall(ctx.Method, ctx.Host, ctx.Options, req));
+        }
+
+        /// <summary>
+        /// Intercepts an asynchronous client streaming call with the registered interceptor.
+        /// </summary>
+        public override AsyncClientStreamingCall<TRequest, TResponse> AsyncClientStreamingCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options)
+        {
+            return interceptor.AsyncClientStreamingCall(
+                new ClientInterceptorContext<TRequest, TResponse>(method, host, options),
+                ctx => invoker.AsyncClientStreamingCall(ctx.Method, ctx.Host, ctx.Options));
+        }
+
+        /// <summary>
+        /// Intercepts an asynchronous duplex streaming call with the registered interceptor.
+        /// </summary>
+        public override AsyncDuplexStreamingCall<TRequest, TResponse> AsyncDuplexStreamingCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options)
+        {
+            return interceptor.AsyncDuplexStreamingCall(
+                new ClientInterceptorContext<TRequest, TResponse>(method, host, options),
+                ctx => invoker.AsyncDuplexStreamingCall(ctx.Method, ctx.Host, ctx.Options));
+        }
+    }
+}