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ServerCallHandlerBase.cs
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ServerCallHandlerBase.cs
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#region Copyright notice and license
// Copyright 2019 The 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.Threading.Tasks;
using Grpc.AspNetCore.Server.Model;
using Grpc.Core;
using Grpc.Shared.Server;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Http.Features;
using Microsoft.AspNetCore.Server.Kestrel.Core.Features;
using Microsoft.Extensions.Logging;
using Microsoft.Net.Http.Headers;
namespace Grpc.AspNetCore.Server.Internal.CallHandlers
{
internal abstract class ServerCallHandlerBase<TService, TRequest, TResponse>
where TService : class
where TRequest : class
where TResponse : class
{
private const string LoggerName = "Grpc.AspNetCore.Server.ServerCallHandler";
protected ServerMethodInvokerBase<TService, TRequest, TResponse> MethodInvoker { get; }
protected ILogger Logger { get; }
protected ServerCallHandlerBase(
ServerMethodInvokerBase<TService, TRequest, TResponse> methodInvoker,
ILoggerFactory loggerFactory)
{
MethodInvoker = methodInvoker;
Logger = loggerFactory.CreateLogger(LoggerName);
}
public Task HandleCallAsync(HttpContext httpContext)
{
if (GrpcProtocolHelpers.IsInvalidContentType(httpContext, out var error))
{
return ProcessInvalidContentTypeRequest(httpContext, error);
}
if (!GrpcProtocolConstants.IsHttp2(httpContext.Request.Protocol))
{
return ProcessNonHttp2Request(httpContext);
}
var serverCallContext = new HttpContextServerCallContext(httpContext, MethodInvoker.Options, typeof(TRequest), typeof(TResponse), Logger);
httpContext.Features.Set<IServerCallContextFeature>(serverCallContext);
GrpcProtocolHelpers.AddProtocolHeaders(httpContext.Response);
try
{
serverCallContext.Initialize();
var handleCallTask = HandleCallAsyncCore(httpContext, serverCallContext);
if (handleCallTask.IsCompletedSuccessfully)
{
return serverCallContext.EndCallAsync();
}
else
{
return AwaitHandleCall(serverCallContext, MethodInvoker.Method, handleCallTask);
}
}
catch (Exception ex)
{
return serverCallContext.ProcessHandlerErrorAsync(ex, MethodInvoker.Method.Name);
}
static async Task AwaitHandleCall(HttpContextServerCallContext serverCallContext, Method<TRequest, TResponse> method, Task handleCall)
{
try
{
await handleCall;
await serverCallContext.EndCallAsync();
}
catch (Exception ex)
{
await serverCallContext.ProcessHandlerErrorAsync(ex, method.Name);
}
}
}
protected abstract Task HandleCallAsyncCore(HttpContext httpContext, HttpContextServerCallContext serverCallContext);
/// <summary>
/// This should only be called from client streaming calls
/// </summary>
/// <param name="httpContext"></param>
protected void DisableMinRequestBodyDataRateAndMaxRequestBodySize(HttpContext httpContext)
{
var minRequestBodyDataRateFeature = httpContext.Features.Get<IHttpMinRequestBodyDataRateFeature>();
if (minRequestBodyDataRateFeature != null)
{
minRequestBodyDataRateFeature.MinDataRate = null;
}
var maxRequestBodySizeFeature = httpContext.Features.Get<IHttpMaxRequestBodySizeFeature>();
if (maxRequestBodySizeFeature != null)
{
if (!maxRequestBodySizeFeature.IsReadOnly)
{
maxRequestBodySizeFeature.MaxRequestBodySize = null;
}
else
{
// IsReadOnly could be true if middleware has already started reading the request body
// In that case we can't disable the max request body size for the request stream
GrpcServerLog.UnableToDisableMaxRequestBodySize(Logger);
}
}
}
private Task ProcessNonHttp2Request(HttpContext httpContext)
{
GrpcServerLog.UnsupportedRequestProtocol(Logger, httpContext.Request.Protocol);
var protocolError = $"Request protocol '{httpContext.Request.Protocol}' is not supported.";
GrpcProtocolHelpers.BuildHttpErrorResponse(httpContext.Response, StatusCodes.Status426UpgradeRequired, StatusCode.Internal, protocolError);
httpContext.Response.Headers[HeaderNames.Upgrade] = GrpcProtocolConstants.Http2Protocol;
return Task.CompletedTask;
}
private Task ProcessInvalidContentTypeRequest(HttpContext httpContext, string error)
{
// This might be a CORS preflight request and CORS middleware hasn't been configured
if (GrpcProtocolHelpers.IsCorsPreflightRequest(httpContext))
{
GrpcServerLog.UnhandledCorsPreflightRequest(Logger);
GrpcProtocolHelpers.BuildHttpErrorResponse(httpContext.Response, StatusCodes.Status405MethodNotAllowed, StatusCode.Internal, "Unhandled CORS preflight request received. CORS may not be configured correctly in the application.");
httpContext.Response.Headers[HeaderNames.Allow] = HttpMethods.Post;
return Task.CompletedTask;
}
else
{
GrpcServerLog.UnsupportedRequestContentType(Logger, httpContext.Request.ContentType);
GrpcProtocolHelpers.BuildHttpErrorResponse(httpContext.Response, StatusCodes.Status415UnsupportedMediaType, StatusCode.Internal, error);
return Task.CompletedTask;
}
}
}
}