Move InterceptingCallInvoker to its own file

1 files changed, 96 insertions, 0 deletions

diff --git a/src/csharp/Grpc.Core/Interceptors/InterceptingCallInvoker.cs b/src/csharp/Grpc.Core/Interceptors/InterceptingCallInvoker.cs
new file mode 100644
index 0000000000..fb06523abb
--- /dev/null
+++ b/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));
+        }
+    }
+}