mirror of https://github.com/grpc/grpc.git
Jan Tattermusch
9 years ago
parent
b455bcc301
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#region Copyright notice and license |
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|
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// Copyright 2015, Google Inc. |
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// All rights reserved. |
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// |
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// Redistribution and use in source and binary forms, with or without |
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// modification, are permitted provided that the following conditions are |
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// met: |
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// |
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// * Redistributions of source code must retain the above copyright |
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// notice, this list of conditions and the following disclaimer. |
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// * Redistributions in binary form must reproduce the above |
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// copyright notice, this list of conditions and the following disclaimer |
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// in the documentation and/or other materials provided with the |
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// distribution. |
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// * Neither the name of Google Inc. nor the names of its |
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// contributors may be used to endorse or promote products derived from |
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// this software without specific prior written permission. |
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// |
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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#endregion |
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using System; |
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using System.Threading.Tasks; |
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using Grpc.Core.Internal; |
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using Grpc.Core.Utils; |
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namespace Grpc.Core |
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{ |
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/// <summary> |
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/// Decorates an underlying <c>CallInvoker</c> to intercept call invocations. |
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/// </summary> |
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internal class InterceptingCallInvoker : CallInvoker |
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{ |
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readonly CallInvoker callInvoker; |
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readonly Func<string, string> hostInterceptor; |
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readonly Func<CallOptions, CallOptions> callOptionsInterceptor; |
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/// <summary> |
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/// Initializes a new instance of the <see cref="Grpc.Core.InterceptingCallInvoker"/> class. |
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/// </summary> |
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/// <param name="callInvoker">CallInvoker to decorate.</param> |
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public InterceptingCallInvoker(CallInvoker callInvoker, |
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Func<string, string> hostInterceptor = null, |
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Func<CallOptions, CallOptions> callOptionsInterceptor = null) |
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{ |
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this.callInvoker = GrpcPreconditions.CheckNotNull(callInvoker); |
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this.hostInterceptor = hostInterceptor; |
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this.callOptionsInterceptor = callOptionsInterceptor; |
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} |
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/// <summary> |
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/// Intercepts a unary call. |
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/// </summary> |
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public override TResponse BlockingUnaryCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options, TRequest request) |
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{ |
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host = InterceptHost(host); |
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options = InterceptCallOptions(options); |
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return callInvoker.BlockingUnaryCall(method, host, options, request); |
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} |
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|
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/// <summary> |
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/// Invokes a simple remote call asynchronously. |
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/// </summary> |
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public override AsyncUnaryCall<TResponse> AsyncUnaryCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options, TRequest request) |
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{ |
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host = InterceptHost(host); |
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options = InterceptCallOptions(options); |
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return callInvoker.AsyncUnaryCall(method, host, options, request); |
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} |
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|
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/// <summary> |
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/// Invokes a server streaming call asynchronously. |
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/// In server streaming scenario, client sends on request and server responds with a stream of responses. |
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/// </summary> |
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public override AsyncServerStreamingCall<TResponse> AsyncServerStreamingCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options, TRequest request) |
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{ |
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host = InterceptHost(host); |
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options = InterceptCallOptions(options); |
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return callInvoker.AsyncServerStreamingCall(method, host, options, request); |
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} |
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|
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/// <summary> |
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/// Invokes a client streaming call asynchronously. |
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/// In client streaming scenario, client sends a stream of requests and server responds with a single response. |
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/// </summary> |
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public override AsyncClientStreamingCall<TRequest, TResponse> AsyncClientStreamingCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options) |
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{ |
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host = InterceptHost(host); |
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options = InterceptCallOptions(options); |
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return callInvoker.AsyncClientStreamingCall(method, host, options); |
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} |
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/// <summary> |
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/// Invokes a duplex streaming call asynchronously. |
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/// In duplex streaming scenario, client sends a stream of requests and server responds with a stream of responses. |
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/// The response stream is completely independent and both side can be sending messages at the same time. |
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/// </summary> |
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public override AsyncDuplexStreamingCall<TRequest, TResponse> AsyncDuplexStreamingCall<TRequest, TResponse>(Method<TRequest, TResponse> method, string host, CallOptions options) |
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{ |
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host = InterceptHost(host); |
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options = InterceptCallOptions(options); |
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return callInvoker.AsyncDuplexStreamingCall(method, host, options); |
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} |
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private string InterceptHost(string host) |
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{ |
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// only set host if not already set to support composing interceptors. |
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if (hostInterceptor == null || host != null) |
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{ |
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return host; |
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} |
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return hostInterceptor(host); |
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} |
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private CallOptions InterceptCallOptions(CallOptions options) |
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{ |
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if (callOptionsInterceptor == null) |
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{ |
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return options; |
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} |
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return callOptionsInterceptor(options); |
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} |
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} |
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} |
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