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#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);
}
}
}
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