| #region Copyright notice and license |
| |
| // Copyright 2015-2016 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 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); |
| } |
| } |
| } |