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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.Linq;
using Grpc.Core.Utils;
namespace Grpc.Core.Interceptors
{
/// <summary>
/// Extends the ServerServiceDefinition class to add methods used to register interceptors on the server side.
/// </summary>
public static class ServerServiceDefinitionExtensions
{
/// <summary>
/// Returns a <see cref="Grpc.Core.ServerServiceDefinition" /> instance that
/// intercepts incoming calls to the underlying service handler through the given interceptor.
/// </summary>
/// <param name="serverServiceDefinition">The <see cref="Grpc.Core.ServerServiceDefinition" /> instance to register interceptors on.</param>
/// <param name="interceptor">The interceptor to intercept the incoming invocations with.</param>
/// <remarks>
/// Multiple interceptors can be added on top of each other by calling
/// "serverServiceDefinition.Intercept(a, b, c)". The order of invocation will be "a", "b", and then "c".
/// Interceptors can be later added to an existing intercepted service definition, effectively
/// building a chain like "serverServiceDefinition.Intercept(c).Intercept(b).Intercept(a)". Note that
/// in this case, the last interceptor added will be the first to take control.
/// </remarks>
public static ServerServiceDefinition Intercept(this ServerServiceDefinition serverServiceDefinition, Interceptor interceptor)
{
GrpcPreconditions.CheckNotNull(serverServiceDefinition, nameof(serverServiceDefinition));
GrpcPreconditions.CheckNotNull(interceptor, nameof(interceptor));
return new ServerServiceDefinition(serverServiceDefinition.CallHandlers.ToDictionary(x => x.Key, x => x.Value.Intercept(interceptor)));
}
/// <summary>
/// Returns a <see cref="Grpc.Core.ServerServiceDefinition" /> instance that
/// intercepts incoming calls to the underlying service handler through the given interceptors.
/// </summary>
/// <param name="serverServiceDefinition">The <see cref="Grpc.Core.ServerServiceDefinition" /> instance to register interceptors on.</param>
/// <param name="interceptors">
/// An array of interceptors to intercept the incoming invocations with.
/// Control is passed to the interceptors in the order specified.
/// </param>
/// <remarks>
/// Multiple interceptors can be added on top of each other by calling
/// "serverServiceDefinition.Intercept(a, b, c)". The order of invocation will be "a", "b", and then "c".
/// Interceptors can be later added to an existing intercepted service definition, effectively
/// building a chain like "serverServiceDefinition.Intercept(c).Intercept(b).Intercept(a)". Note that
/// in this case, the last interceptor added will be the first to take control.
/// </remarks>
public static ServerServiceDefinition Intercept(this ServerServiceDefinition serverServiceDefinition, params Interceptor[] interceptors)
{
GrpcPreconditions.CheckNotNull(serverServiceDefinition, nameof(serverServiceDefinition));
GrpcPreconditions.CheckNotNull(interceptors, nameof(interceptors));
foreach (var interceptor in interceptors.Reverse())
{
serverServiceDefinition = Intercept(serverServiceDefinition, interceptor);
}
return serverServiceDefinition;
}
}
}
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