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#region Copyright notice and license
// Copyright 2015 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.Tasks;
using Grpc.Core;
using Grpc.Core.Utils;
using Grpc.Reflection.V1Alpha;
using Google.Protobuf.Reflection;
namespace Grpc.Reflection
{
/// <summary>
/// Implementation of server reflection service.
/// </summary>
public class ReflectionServiceImpl : Grpc.Reflection.V1Alpha.ServerReflection.ServerReflectionBase
{
readonly List<string> services;
readonly SymbolRegistry symbolRegistry;
/// <summary>
/// Creates a new instance of <c>ReflectionServiceIml</c>.
/// </summary>
public ReflectionServiceImpl(IEnumerable<string> services, SymbolRegistry symbolRegistry)
{
this.services = new List<string>(services);
this.symbolRegistry = symbolRegistry;
}
/// <summary>
/// Creates a new instance of <c>ReflectionServiceIml</c>.
/// </summary>
public ReflectionServiceImpl(IEnumerable<ServiceDescriptor> serviceDescriptors)
{
this.services = new List<string>(serviceDescriptors.Select((serviceDescriptor) => serviceDescriptor.FullName));
this.symbolRegistry = SymbolRegistry.FromFiles(serviceDescriptors.Select((serviceDescriptor) => serviceDescriptor.File));
}
/// <summary>
/// Creates a new instance of <c>ReflectionServiceIml</c>.
/// </summary>
public ReflectionServiceImpl(params ServiceDescriptor[] serviceDescriptors) : this((IEnumerable<ServiceDescriptor>) serviceDescriptors)
{
}
public override async Task ServerReflectionInfo(IAsyncStreamReader<ServerReflectionRequest> requestStream, IServerStreamWriter<ServerReflectionResponse> responseStream, ServerCallContext context)
{
while (await requestStream.MoveNext())
{
var response = ProcessRequest(requestStream.Current);
await responseStream.WriteAsync(response);
}
}
ServerReflectionResponse ProcessRequest(ServerReflectionRequest request)
{
switch (request.MessageRequestCase)
{
case ServerReflectionRequest.MessageRequestOneofCase.FileByFilename:
return FileByFilename(request.FileByFilename);
case ServerReflectionRequest.MessageRequestOneofCase.FileContainingSymbol:
return FileContainingSymbol(request.FileContainingSymbol);
case ServerReflectionRequest.MessageRequestOneofCase.ListServices:
return ListServices();
case ServerReflectionRequest.MessageRequestOneofCase.AllExtensionNumbersOfType:
case ServerReflectionRequest.MessageRequestOneofCase.FileContainingExtension:
default:
return CreateErrorResponse(StatusCode.Unimplemented, "Request type not supported by C# reflection service.");
}
}
ServerReflectionResponse FileByFilename(string filename)
{
FileDescriptor file = symbolRegistry.FileByName(filename);
if (file == null)
{
return CreateErrorResponse(StatusCode.NotFound, "File not found.");
}
var transitiveDependencies = new HashSet<FileDescriptor>();
CollectTransitiveDependencies(file, transitiveDependencies);
return new ServerReflectionResponse
{
FileDescriptorResponse = new FileDescriptorResponse { FileDescriptorProto = { transitiveDependencies.Select((d) => d.SerializedData) } }
};
}
ServerReflectionResponse FileContainingSymbol(string symbol)
{
FileDescriptor file = symbolRegistry.FileContainingSymbol(symbol);
if (file == null)
{
return CreateErrorResponse(StatusCode.NotFound, "Symbol not found.");
}
var transitiveDependencies = new HashSet<FileDescriptor>();
CollectTransitiveDependencies(file, transitiveDependencies);
return new ServerReflectionResponse
{
FileDescriptorResponse = new FileDescriptorResponse { FileDescriptorProto = { transitiveDependencies.Select((d) => d.SerializedData) } }
};
}
ServerReflectionResponse ListServices()
{
var serviceResponses = new ListServiceResponse();
foreach (string serviceName in services)
{
serviceResponses.Service.Add(new ServiceResponse { Name = serviceName });
}
return new ServerReflectionResponse
{
ListServicesResponse = serviceResponses
};
}
ServerReflectionResponse CreateErrorResponse(StatusCode status, string message)
{
return new ServerReflectionResponse
{
ErrorResponse = new ErrorResponse { ErrorCode = (int) status, ErrorMessage = message }
};
}
void CollectTransitiveDependencies(FileDescriptor descriptor, HashSet<FileDescriptor> pool)
{
pool.Add(descriptor);
foreach (var dependency in descriptor.Dependencies)
{
if (pool.Add(dependency))
{
// descriptors cannot have circular dependencies
CollectTransitiveDependencies(dependency, pool);
}
}
}
}
}
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