| #region Copyright notice and license |
| |
| // 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 |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // 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 |
| |
| using System; |
| using System.Threading.Tasks; |
| using Grpc.Core; |
| using Grpc.Core.Utils; |
| |
| namespace Grpc.Core.Internal |
| { |
| /// <summary> |
| /// Decorates an underlying <c>CallInvoker</c> to intercept call invocations. |
| /// </summary> |
| internal class InterceptingCallInvoker : CallInvoker |
| { |
| readonly CallInvoker callInvoker; |
| readonly Func<string, string> hostInterceptor; |
| readonly Func<CallOptions, CallOptions> callOptionsInterceptor; |
| |
| /// <summary> |
| /// Initializes a new instance of the <see cref="Grpc.Core.Internal.InterceptingCallInvoker"/> class. |
| /// </summary> |
| public InterceptingCallInvoker(CallInvoker callInvoker, |
| Func<string, string> hostInterceptor = null, |
| Func<CallOptions, CallOptions> callOptionsInterceptor = null) |
| { |
| this.callInvoker = GrpcPreconditions.CheckNotNull(callInvoker); |
| this.hostInterceptor = hostInterceptor; |
| this.callOptionsInterceptor = callOptionsInterceptor; |
| } |
| |
| /// <summary> |
| /// Intercepts a unary call. |
| /// </summary> |
| public override TResponse BlockingUnaryCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options, TRequest request) |
| { |
| host = InterceptHost(host); |
| options = InterceptCallOptions(options); |
| return callInvoker.BlockingUnaryCall(method, host, options, request); |
| } |
| |
| /// <summary> |
| /// Invokes a simple remote call asynchronously. |
| /// </summary> |
| public override AsyncUnaryCall<TResponse> AsyncUnaryCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options, TRequest request) |
| { |
| host = InterceptHost(host); |
| options = InterceptCallOptions(options); |
| return callInvoker.AsyncUnaryCall(method, host, options, request); |
| } |
| |
| /// <summary> |
| /// Invokes a server streaming call asynchronously. |
| /// In server streaming scenario, client sends on request and server responds with a stream of responses. |
| /// </summary> |
| public override AsyncServerStreamingCall<TResponse> AsyncServerStreamingCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options, TRequest request) |
| { |
| host = InterceptHost(host); |
| options = InterceptCallOptions(options); |
| return callInvoker.AsyncServerStreamingCall(method, host, options, request); |
| } |
| |
| /// <summary> |
| /// Invokes a client streaming call asynchronously. |
| /// In client streaming scenario, client sends a stream of requests and server responds with a single response. |
| /// </summary> |
| public override AsyncClientStreamingCall<TRequest, TResponse> AsyncClientStreamingCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options) |
| { |
| host = InterceptHost(host); |
| options = InterceptCallOptions(options); |
| return callInvoker.AsyncClientStreamingCall(method, host, options); |
| } |
| |
| /// <summary> |
| /// Invokes a duplex streaming call asynchronously. |
| /// In duplex streaming scenario, client sends a stream of requests and server responds with a stream of responses. |
| /// The response stream is completely independent and both side can be sending messages at the same time. |
| /// </summary> |
| public override AsyncDuplexStreamingCall<TRequest, TResponse> AsyncDuplexStreamingCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options) |
| { |
| host = InterceptHost(host); |
| options = InterceptCallOptions(options); |
| return callInvoker.AsyncDuplexStreamingCall(method, host, options); |
| } |
| |
| private string InterceptHost(string host) |
| { |
| if (hostInterceptor == null) |
| { |
| return host; |
| } |
| return hostInterceptor(host); |
| } |
| |
| private CallOptions InterceptCallOptions(CallOptions options) |
| { |
| if (callOptionsInterceptor == null) |
| { |
| return options; |
| } |
| return callOptionsInterceptor(options); |
| } |
| } |
| } |