| #region Copyright notice and license |
| |
| // Copyright 2015, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #endregion |
| |
| using System; |
| using System.Collections.Generic; |
| using System.Linq; |
| using System.Threading; |
| using System.Threading.Tasks; |
| using Grpc.Core.Internal; |
| using Grpc.Core.Utils; |
| |
| namespace Grpc.Core.Internal |
| { |
| internal interface IServerCallHandler |
| { |
| Task HandleCall(ServerRpcNew newRpc, GrpcEnvironment environment); |
| } |
| |
| internal class UnaryServerCallHandler<TRequest, TResponse> : IServerCallHandler |
| where TRequest : class |
| where TResponse : class |
| { |
| readonly Method<TRequest, TResponse> method; |
| readonly UnaryServerMethod<TRequest, TResponse> handler; |
| |
| public UnaryServerCallHandler(Method<TRequest, TResponse> method, UnaryServerMethod<TRequest, TResponse> handler) |
| { |
| this.method = method; |
| this.handler = handler; |
| } |
| |
| public async Task HandleCall(ServerRpcNew newRpc, GrpcEnvironment environment) |
| { |
| var asyncCall = new AsyncCallServer<TRequest, TResponse>( |
| method.ResponseMarshaller.Serializer, |
| method.RequestMarshaller.Deserializer, |
| environment); |
| |
| asyncCall.Initialize(newRpc.Call); |
| var finishedTask = asyncCall.ServerSideCallAsync(); |
| var requestStream = new ServerRequestStream<TRequest, TResponse>(asyncCall); |
| var responseStream = new ServerResponseStream<TRequest, TResponse>(asyncCall); |
| |
| Status status; |
| var context = HandlerUtils.NewContext(newRpc); |
| try |
| { |
| Preconditions.CheckArgument(await requestStream.MoveNext()); |
| var request = requestStream.Current; |
| // TODO(jtattermusch): we need to read the full stream so that native callhandle gets deallocated. |
| Preconditions.CheckArgument(!await requestStream.MoveNext()); |
| var result = await handler(request, context); |
| status = context.Status; |
| await responseStream.WriteAsync(result); |
| } |
| catch (Exception e) |
| { |
| Console.WriteLine("Exception occured in handler: " + e); |
| status = HandlerUtils.StatusFromException(e); |
| } |
| try |
| { |
| await responseStream.WriteStatusAsync(status, context.ResponseTrailers); |
| } |
| catch (OperationCanceledException) |
| { |
| // Call has been already cancelled. |
| } |
| await finishedTask; |
| } |
| } |
| |
| internal class ServerStreamingServerCallHandler<TRequest, TResponse> : IServerCallHandler |
| where TRequest : class |
| where TResponse : class |
| { |
| readonly Method<TRequest, TResponse> method; |
| readonly ServerStreamingServerMethod<TRequest, TResponse> handler; |
| |
| public ServerStreamingServerCallHandler(Method<TRequest, TResponse> method, ServerStreamingServerMethod<TRequest, TResponse> handler) |
| { |
| this.method = method; |
| this.handler = handler; |
| } |
| |
| public async Task HandleCall(ServerRpcNew newRpc, GrpcEnvironment environment) |
| { |
| var asyncCall = new AsyncCallServer<TRequest, TResponse>( |
| method.ResponseMarshaller.Serializer, |
| method.RequestMarshaller.Deserializer, |
| environment); |
| |
| asyncCall.Initialize(newRpc.Call); |
| var finishedTask = asyncCall.ServerSideCallAsync(); |
| var requestStream = new ServerRequestStream<TRequest, TResponse>(asyncCall); |
| var responseStream = new ServerResponseStream<TRequest, TResponse>(asyncCall); |
| |
| Status status; |
| var context = HandlerUtils.NewContext(newRpc); |
| try |
| { |
| Preconditions.CheckArgument(await requestStream.MoveNext()); |
| var request = requestStream.Current; |
| // TODO(jtattermusch): we need to read the full stream so that native callhandle gets deallocated. |
| Preconditions.CheckArgument(!await requestStream.MoveNext()); |
| await handler(request, responseStream, context); |
| status = context.Status; |
| } |
| catch (Exception e) |
| { |
| Console.WriteLine("Exception occured in handler: " + e); |
| status = HandlerUtils.StatusFromException(e); |
| } |
| |
| try |
| { |
| await responseStream.WriteStatusAsync(status, context.ResponseTrailers); |
| } |
| catch (OperationCanceledException) |
| { |
| // Call has been already cancelled. |
| } |
| await finishedTask; |
| } |
| } |
| |
| internal class ClientStreamingServerCallHandler<TRequest, TResponse> : IServerCallHandler |
| where TRequest : class |
| where TResponse : class |
| { |
| readonly Method<TRequest, TResponse> method; |
| readonly ClientStreamingServerMethod<TRequest, TResponse> handler; |
| |
| public ClientStreamingServerCallHandler(Method<TRequest, TResponse> method, ClientStreamingServerMethod<TRequest, TResponse> handler) |
| { |
| this.method = method; |
| this.handler = handler; |
| } |
| |
| public async Task HandleCall(ServerRpcNew newRpc, GrpcEnvironment environment) |
| { |
| var asyncCall = new AsyncCallServer<TRequest, TResponse>( |
| method.ResponseMarshaller.Serializer, |
| method.RequestMarshaller.Deserializer, |
| environment); |
| |
| asyncCall.Initialize(newRpc.Call); |
| var finishedTask = asyncCall.ServerSideCallAsync(); |
| var requestStream = new ServerRequestStream<TRequest, TResponse>(asyncCall); |
| var responseStream = new ServerResponseStream<TRequest, TResponse>(asyncCall); |
| |
| Status status; |
| var context = HandlerUtils.NewContext(newRpc); |
| try |
| { |
| var result = await handler(requestStream, context); |
| status = context.Status; |
| try |
| { |
| await responseStream.WriteAsync(result); |
| } |
| catch (OperationCanceledException) |
| { |
| status = Status.DefaultCancelled; |
| } |
| } |
| catch (Exception e) |
| { |
| Console.WriteLine("Exception occured in handler: " + e); |
| status = HandlerUtils.StatusFromException(e); |
| } |
| |
| try |
| { |
| await responseStream.WriteStatusAsync(status, context.ResponseTrailers); |
| } |
| catch (OperationCanceledException) |
| { |
| // Call has been already cancelled. |
| } |
| await finishedTask; |
| } |
| } |
| |
| internal class DuplexStreamingServerCallHandler<TRequest, TResponse> : IServerCallHandler |
| where TRequest : class |
| where TResponse : class |
| { |
| readonly Method<TRequest, TResponse> method; |
| readonly DuplexStreamingServerMethod<TRequest, TResponse> handler; |
| |
| public DuplexStreamingServerCallHandler(Method<TRequest, TResponse> method, DuplexStreamingServerMethod<TRequest, TResponse> handler) |
| { |
| this.method = method; |
| this.handler = handler; |
| } |
| |
| public async Task HandleCall(ServerRpcNew newRpc, GrpcEnvironment environment) |
| { |
| var asyncCall = new AsyncCallServer<TRequest, TResponse>( |
| method.ResponseMarshaller.Serializer, |
| method.RequestMarshaller.Deserializer, |
| environment); |
| |
| asyncCall.Initialize(newRpc.Call); |
| var finishedTask = asyncCall.ServerSideCallAsync(); |
| var requestStream = new ServerRequestStream<TRequest, TResponse>(asyncCall); |
| var responseStream = new ServerResponseStream<TRequest, TResponse>(asyncCall); |
| |
| Status status; |
| var context = HandlerUtils.NewContext(newRpc); |
| try |
| { |
| await handler(requestStream, responseStream, context); |
| status = context.Status; |
| } |
| catch (Exception e) |
| { |
| Console.WriteLine("Exception occured in handler: " + e); |
| status = HandlerUtils.StatusFromException(e); |
| } |
| try |
| { |
| await responseStream.WriteStatusAsync(status, context.ResponseTrailers); |
| } |
| catch (OperationCanceledException) |
| { |
| // Call has been already cancelled. |
| } |
| await finishedTask; |
| } |
| } |
| |
| internal class NoSuchMethodCallHandler : IServerCallHandler |
| { |
| public static readonly NoSuchMethodCallHandler Instance = new NoSuchMethodCallHandler(); |
| |
| public async Task HandleCall(ServerRpcNew newRpc, GrpcEnvironment environment) |
| { |
| // We don't care about the payload type here. |
| var asyncCall = new AsyncCallServer<byte[], byte[]>( |
| (payload) => payload, (payload) => payload, environment); |
| |
| asyncCall.Initialize(newRpc.Call); |
| var finishedTask = asyncCall.ServerSideCallAsync(); |
| var responseStream = new ServerResponseStream<byte[], byte[]>(asyncCall); |
| |
| await responseStream.WriteStatusAsync(new Status(StatusCode.Unimplemented, "No such method."), Metadata.Empty); |
| await finishedTask; |
| } |
| } |
| |
| internal static class HandlerUtils |
| { |
| public static Status StatusFromException(Exception e) |
| { |
| var rpcException = e as RpcException; |
| if (rpcException != null) |
| { |
| // use the status thrown by handler. |
| return rpcException.Status; |
| } |
| |
| // TODO(jtattermusch): what is the right status code here? |
| return new Status(StatusCode.Unknown, "Exception was thrown by handler."); |
| } |
| |
| public static ServerCallContext NewContext(ServerRpcNew newRpc) |
| { |
| return new ServerCallContext( |
| newRpc.Method, newRpc.Host, newRpc.Deadline.ToDateTime(), |
| newRpc.RequestMetadata, CancellationToken.None); |
| } |
| } |
| } |