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#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 System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Grpc.Core;
using Grpc.Core.Interceptors;
using Grpc.Core.Internal;
using Grpc.Core.Tests;
using Grpc.Core.Utils;
using NUnit.Framework;
namespace Grpc.Core.Interceptors.Tests
{
public class ServerInterceptorTest
{
const string Host = "127.0.0.1";
[Test]
public void AddRequestHeaderInServerInterceptor()
{
var helper = new MockServiceHelper(Host);
const string MetadataKey = "x-interceptor";
const string MetadataValue = "hello world";
var interceptor = new ServerCallContextInterceptor(ctx => ctx.RequestHeaders.Add(new Metadata.Entry(MetadataKey, MetadataValue)));
helper.UnaryHandler = new UnaryServerMethod<string, string>((request, context) =>
{
var interceptorHeader = context.RequestHeaders.Last(m => (m.Key == MetadataKey)).Value;
Assert.AreEqual(interceptorHeader, MetadataValue);
return Task.FromResult("PASS");
});
helper.ServiceDefinition = helper.ServiceDefinition.Intercept(interceptor);
var server = helper.GetServer();
server.Start();
var channel = helper.GetChannel();
Assert.AreEqual("PASS", Calls.BlockingUnaryCall(helper.CreateUnaryCall(), ""));
}
[Test]
public void VerifyInterceptorOrdering()
{
var helper = new MockServiceHelper(Host);
helper.UnaryHandler = new UnaryServerMethod<string, string>((request, context) =>
{
return Task.FromResult("PASS");
});
var stringBuilder = new StringBuilder();
helper.ServiceDefinition = helper.ServiceDefinition
.Intercept(new ServerCallContextInterceptor(ctx => stringBuilder.Append("A")))
.Intercept(new ServerCallContextInterceptor(ctx => stringBuilder.Append("B1")),
new ServerCallContextInterceptor(ctx => stringBuilder.Append("B2")),
new ServerCallContextInterceptor(ctx => stringBuilder.Append("B3")))
.Intercept(new ServerCallContextInterceptor(ctx => stringBuilder.Append("C")));
var server = helper.GetServer();
server.Start();
var channel = helper.GetChannel();
Assert.AreEqual("PASS", Calls.BlockingUnaryCall(helper.CreateUnaryCall(), ""));
Assert.AreEqual("CB1B2B3A", stringBuilder.ToString());
}
[Test]
public void CheckNullInterceptorRegistrationFails()
{
var helper = new MockServiceHelper(Host);
var sd = helper.ServiceDefinition;
Assert.Throws<ArgumentNullException>(() => sd.Intercept(default(Interceptor)));
Assert.Throws<ArgumentNullException>(() => sd.Intercept(new[]{default(Interceptor)}));
Assert.Throws<ArgumentNullException>(() => sd.Intercept(new[]{new ServerCallContextInterceptor(ctx=>{}), null}));
Assert.Throws<ArgumentNullException>(() => sd.Intercept(default(Interceptor[])));
}
private class ServerCallContextInterceptor : Interceptor
{
readonly Action<ServerCallContext> interceptor;
public ServerCallContextInterceptor(Action<ServerCallContext> interceptor)
{
GrpcPreconditions.CheckNotNull(interceptor, nameof(interceptor));
this.interceptor = interceptor;
}
public override Task<TResponse> UnaryServerHandler<TRequest, TResponse>(TRequest request, ServerCallContext context, UnaryServerMethod<TRequest, TResponse> continuation)
{
interceptor(context);
return continuation(request, context);
}
public override Task<TResponse> ClientStreamingServerHandler<TRequest, TResponse>(IAsyncStreamReader<TRequest> requestStream, ServerCallContext context, ClientStreamingServerMethod<TRequest, TResponse> continuation)
{
interceptor(context);
return continuation(requestStream, context);
}
public override Task ServerStreamingServerHandler<TRequest, TResponse>(TRequest request, IServerStreamWriter<TResponse> responseStream, ServerCallContext context, ServerStreamingServerMethod<TRequest, TResponse> continuation)
{
interceptor(context);
return continuation(request, responseStream, context);
}
public override Task DuplexStreamingServerHandler<TRequest, TResponse>(IAsyncStreamReader<TRequest> requestStream, IServerStreamWriter<TResponse> responseStream, ServerCallContext context, DuplexStreamingServerMethod<TRequest, TResponse> continuation)
{
interceptor(context);
return continuation(requestStream, responseStream, context);
}
}
}
}
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