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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.Reflection;
using System.Threading.Tasks;
using Grpc.Core.Internal;
namespace Grpc.Core.Interceptors
{
/// <summary>
/// Carries along the context associated with intercepted invocations on the client side.
/// This is an EXPERIMENTAL API.
/// </summary>
public class ClientInterceptorContext<TRequest, TResponse>
where TRequest : class
where TResponse : class
{
/// <summary>
/// Creates a new instance of <see cref="Grpc.Core.Interceptors.ClientInterceptorContext{TRequest, TResponse}" />
/// with the specified method, host, and call options.
/// </summary>
/// <param name="method">A <see cref="Grpc.Core.Method{TRequest, TResponse}"/> object representing the method to be invoked.</param>
/// <param name="host">The host to dispatch the current call to.</param>
/// <param name="options">A <see cref="Grpc.Core.CallOptions"/> instance containing the call options of the current call.</param>
public ClientInterceptorContext(Method<TRequest, TResponse> method, string host, CallOptions options)
{
Method = method;
Host = host;
Options = options;
}
/// <summary>
/// Gets the <see cref="Grpc.Core.Method{TRequest, TResponse}"/> representing
/// the method to be invoked.
/// </summary>
public Method<TRequest, TResponse> Method { get; }
/// <summary>
/// Gets the host that the currect invocation will be dispatched to.
/// </summary>
public string Host { get; }
/// <summary>
/// Gets the <see cref="Grpc.Core.CallOptions"/> structure representing the
/// call options associated with the current invocation.
/// </summary>
public CallOptions Options { get; }
}
/// <summary>
/// Serves as the base class for gRPC interceptors.
/// This is an EXPERIMENTAL API.
/// </summary>
public abstract class Interceptor
{
/// <summary>
/// Represents a continuation for intercepting simple blocking invocations.
/// </summary>
/// <typeparam name="TRequest">Request message type for this invocation.</typeparam>
/// <typeparam name="TResponse">Response message type for this invocation.</typeparam>
/// <param name="request">The request value to continue the invocation with.</param>
/// <param name="context">
/// The <see cref="Grpc.Core.Interceptors.ClientInterceptorContext{TRequest, TResponse}"/>
/// instance to pass to the next step in the invocation process.
/// </param>
public delegate TResponse BlockingUnaryCallContinuation<TRequest, TResponse>(TRequest request, ClientInterceptorContext<TRequest, TResponse> context)
where TRequest : class
where TResponse : class;
/// <summary>
/// Represents a continuation for intercepting simple asynchronous invocations.
/// </summary>
/// <typeparam name="TRequest">Request message type for this invocation.</typeparam>
/// <typeparam name="TResponse">Response message type for this invocation.</typeparam>
/// <param name="request">The request value to continue the invocation with.</param>
/// <param name="context">
/// The <see cref="Grpc.Core.Interceptors.ClientInterceptorContext{TRequest, TResponse}"/>
/// instance to pass to the next step in the invocation process.
/// </param>
public delegate AsyncUnaryCall<TResponse> AsyncUnaryCallContinuation<TRequest, TResponse>(TRequest request, ClientInterceptorContext<TRequest, TResponse> context)
where TRequest : class
where TResponse : class;
/// <summary>
/// Represents a continuation for intercepting asynchronous server-streaming invocations.
/// </summary>
/// <typeparam name="TRequest">Request message type for this invocation.</typeparam>
/// <typeparam name="TResponse">Response message type for this invocation.</typeparam>
/// <param name="request">The request value to continue the invocation with.</param>
/// <param name="context">
/// The <see cref="Grpc.Core.Interceptors.ClientInterceptorContext{TRequest, TResponse}"/>
/// instance to pass to the next step in the invocation process.
/// </param>
public delegate AsyncServerStreamingCall<TResponse> AsyncServerStreamingCallContinuation<TRequest, TResponse>(TRequest request, ClientInterceptorContext<TRequest, TResponse> context)
where TRequest : class
where TResponse : class;
/// <summary>
/// Represents a continuation for intercepting asynchronous client-streaming invocations.
/// </summary>
/// <typeparam name="TRequest">Request message type for this invocation.</typeparam>
/// <typeparam name="TResponse">Response message type for this invocation.</typeparam>
/// <param name="context">
/// The <see cref="Grpc.Core.Interceptors.ClientInterceptorContext{TRequest, TResponse}"/>
/// instance to pass to the next step in the invocation process.
/// </param>
public delegate AsyncClientStreamingCall<TRequest, TResponse> AsyncClientStreamingCallContinuation<TRequest, TResponse>(ClientInterceptorContext<TRequest, TResponse> context)
where TRequest : class
where TResponse : class;
/// <summary>
/// Represents a continuation for intercepting asynchronous duplex invocations.
/// </summary>
/// <param name="context">
/// The <see cref="Grpc.Core.Interceptors.ClientInterceptorContext{TRequest, TResponse}"/>
/// instance to pass to the next step in the invocation process.
/// </param>
public delegate AsyncDuplexStreamingCall<TRequest, TResponse> AsyncDuplexStreamingCallContinuation<TRequest, TResponse>(ClientInterceptorContext<TRequest, TResponse> context)
where TRequest : class
where TResponse : class;
/// <summary>
/// Intercepts a blocking invocation of a simple remote call.
/// </summary>
/// <param name="request">The request message of the invocation.</param>
/// <param name="context">
/// The <see cref="Grpc.Core.Interceptors.ClientInterceptorContext{TRequest, TResponse}"/>
/// associated with the current invocation.
/// </param>
/// <param name="continuation">
/// The callback that continues the invocation process.
/// This can be invoked zero or more times by the interceptor.
/// </param>
/// <returns>The response message of the current invocation.</returns>
public virtual TResponse BlockingUnaryCall<TRequest, TResponse>(TRequest request, ClientInterceptorContext<TRequest, TResponse> context, BlockingUnaryCallContinuation<TRequest, TResponse> continuation)
where TRequest : class
where TResponse : class
{
return continuation(request, context);
}
/// <summary>
/// Intercepts an asynchronous invocation of a simple remote call.
/// </summary>
/// <param name="request">The request message of the invocation.</param>
/// <param name="context">
/// The <see cref="Grpc.Core.Interceptors.ClientInterceptorContext{TRequest, TResponse}"/>
/// associated with the current invocation.
/// </param>
/// <param name="continuation">
/// The callback that continues the invocation process.
/// This can be invoked zero or more times by the interceptor.
/// </param>
public virtual AsyncUnaryCall<TResponse> AsyncUnaryCall<TRequest, TResponse>(TRequest request, ClientInterceptorContext<TRequest, TResponse> context, AsyncUnaryCallContinuation<TRequest, TResponse> continuation)
where TRequest : class
where TResponse : class
{
return continuation(request, context);
}
/// <summary>
/// Intercepts an asynchronous invocation of a streaming remote call.
/// </summary>
/// <param name="request">The request message of the invocation.</param>
/// <param name="context">
/// The <see cref="Grpc.Core.Interceptors.ClientInterceptorContext{TRequest, TResponse}"/>
/// associated with the current invocation.
/// </param>
/// <param name="continuation">
/// The callback that continues the invocation process.
/// This can be invoked zero or more times by the interceptor.
/// </param>
public virtual AsyncServerStreamingCall<TResponse> AsyncServerStreamingCall<TRequest, TResponse>(TRequest request, ClientInterceptorContext<TRequest, TResponse> context, AsyncServerStreamingCallContinuation<TRequest, TResponse> continuation)
where TRequest : class
where TResponse : class
{
return continuation(request, context);
}
/// <summary>
/// Intercepts an asynchronous invocation of a client streaming call.
/// </summary>
/// <param name="context">
/// The <see cref="Grpc.Core.Interceptors.ClientInterceptorContext{TRequest, TResponse}"/>
/// associated with the current invocation.
/// </param>
/// <param name="continuation">
/// The callback that continues the invocation process.
/// This can be invoked zero or more times by the interceptor.
/// </param>
public virtual AsyncClientStreamingCall<TRequest, TResponse> AsyncClientStreamingCall<TRequest, TResponse>(ClientInterceptorContext<TRequest, TResponse> context, AsyncClientStreamingCallContinuation<TRequest, TResponse> continuation)
where TRequest : class
where TResponse : class
{
return continuation(context);
}
/// <summary>
/// Intercepts an asynchronous invocation of a duplex streaming call.
/// </summary>
/// <param name="context">
/// The <see cref="Grpc.Core.Interceptors.ClientInterceptorContext{TRequest, TResponse}"/>
/// associated with the current invocation.
/// </param>
/// <param name="continuation">
/// The callback that continues the invocation process.
/// This can be invoked zero or more times by the interceptor.
/// </param>
public virtual AsyncDuplexStreamingCall<TRequest, TResponse> AsyncDuplexStreamingCall<TRequest, TResponse>(ClientInterceptorContext<TRequest, TResponse> context, AsyncDuplexStreamingCallContinuation<TRequest, TResponse> continuation)
where TRequest : class
where TResponse : class
{
return continuation(context);
}
/// <summary>
/// Server-side handler for intercepting unary calls.
/// </summary>
/// <typeparam name="TRequest">Request message type for this method.</typeparam>
/// <typeparam name="TResponse">Response message type for this method.</typeparam>
public virtual Task<TResponse> UnaryServerHandler<TRequest, TResponse>(TRequest request, ServerCallContext context, UnaryServerMethod<TRequest, TResponse> continuation)
where TRequest : class
where TResponse : class
{
return continuation(request, context);
}
/// <summary>
/// Server-side handler for intercepting client streaming call.
/// </summary>
/// <typeparam name="TRequest">Request message type for this method.</typeparam>
/// <typeparam name="TResponse">Response message type for this method.</typeparam>
public virtual Task<TResponse> ClientStreamingServerHandler<TRequest, TResponse>(IAsyncStreamReader<TRequest> requestStream, ServerCallContext context, ClientStreamingServerMethod<TRequest, TResponse> continuation)
where TRequest : class
where TResponse : class
{
return continuation(requestStream, context);
}
/// <summary>
/// Server-side handler for intercepting server streaming calls.
/// </summary>
/// <typeparam name="TRequest">Request message type for this method.</typeparam>
/// <typeparam name="TResponse">Response message type for this method.</typeparam>
public virtual Task ServerStreamingServerHandler<TRequest, TResponse>(TRequest request, IServerStreamWriter<TResponse> responseStream, ServerCallContext context, ServerStreamingServerMethod<TRequest, TResponse> continuation)
where TRequest : class
where TResponse : class
{
return continuation(request, responseStream, context);
}
/// <summary>
/// Server-side handler for intercepting bidi streaming calls.
/// </summary>
/// <typeparam name="TRequest">Request message type for this method.</typeparam>
/// <typeparam name="TResponse">Response message type for this method.</typeparam>
public virtual Task DuplexStreamingServerHandler<TRequest, TResponse>(IAsyncStreamReader<TRequest> requestStream, IServerStreamWriter<TResponse> responseStream, ServerCallContext context, DuplexStreamingServerMethod<TRequest, TResponse> continuation)
where TRequest : class
where TResponse : class
{
return continuation(requestStream, responseStream, context);
}
}
}
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