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// Licensed to the Apache Software Foundation(ASF) under one
// or more contributor license agreements.See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.The ASF licenses this file
// to you 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.
using System;
using System.Collections.Generic;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using Thrift.Protocol;
using Thrift.Protocol.Entities;
namespace Thrift.Processor
{
// ReSharper disable once InconsistentNaming
public class TMultiplexedProcessor : ITAsyncProcessor
{
//TODO: Localization
private readonly Dictionary<string, ITAsyncProcessor> _serviceProcessorMap =
new Dictionary<string, ITAsyncProcessor>();
public async Task<bool> ProcessAsync(TProtocol iprot, TProtocol oprot)
{
return await ProcessAsync(iprot, oprot, CancellationToken.None);
}
public async Task<bool> ProcessAsync(TProtocol iprot, TProtocol oprot, CancellationToken cancellationToken)
{
if (cancellationToken.IsCancellationRequested)
{
return await Task.FromCanceled<bool>(cancellationToken);
}
try
{
var message = await iprot.ReadMessageBeginAsync(cancellationToken);
if ((message.Type != TMessageType.Call) && (message.Type != TMessageType.Oneway))
{
await FailAsync(oprot, message, TApplicationException.ExceptionType.InvalidMessageType,
"Message exType CALL or ONEWAY expected", cancellationToken);
return false;
}
// Extract the service name
var index = message.Name.IndexOf(TMultiplexedProtocol.Separator, StringComparison.Ordinal);
if (index < 0)
{
await FailAsync(oprot, message, TApplicationException.ExceptionType.InvalidProtocol,
$"Service name not found in message name: {message.Name}. Did you forget to use a TMultiplexProtocol in your client?",
cancellationToken);
return false;
}
// Create a new TMessage, something that can be consumed by any TProtocol
var serviceName = message.Name.Substring(0, index);
ITAsyncProcessor actualProcessor;
if (!_serviceProcessorMap.TryGetValue(serviceName, out actualProcessor))
{
await FailAsync(oprot, message, TApplicationException.ExceptionType.InternalError,
$"Service name not found: {serviceName}. Did you forget to call RegisterProcessor()?",
cancellationToken);
return false;
}
// Create a new TMessage, removing the service name
var newMessage = new TMessage(
message.Name.Substring(serviceName.Length + TMultiplexedProtocol.Separator.Length),
message.Type,
message.SeqID);
// Dispatch processing to the stored processor
return
await
actualProcessor.ProcessAsync(new StoredMessageProtocol(iprot, newMessage), oprot,
cancellationToken);
}
catch (IOException)
{
return false; // similar to all other processors
}
}
public void RegisterProcessor(string serviceName, ITAsyncProcessor processor)
{
if (_serviceProcessorMap.ContainsKey(serviceName))
{
throw new InvalidOperationException(
$"Processor map already contains processor with name: '{serviceName}'");
}
_serviceProcessorMap.Add(serviceName, processor);
}
private async Task FailAsync(TProtocol oprot, TMessage message, TApplicationException.ExceptionType extype,
string etxt, CancellationToken cancellationToken)
{
var appex = new TApplicationException(extype, etxt);
var newMessage = new TMessage(message.Name, TMessageType.Exception, message.SeqID);
await oprot.WriteMessageBeginAsync(newMessage, cancellationToken);
await appex.WriteAsync(oprot, cancellationToken);
await oprot.WriteMessageEndAsync(cancellationToken);
await oprot.Transport.FlushAsync(cancellationToken);
}
private class StoredMessageProtocol : TProtocolDecorator
{
readonly TMessage _msgBegin;
public StoredMessageProtocol(TProtocol protocol, TMessage messageBegin)
: base(protocol)
{
_msgBegin = messageBegin;
}
public override async ValueTask<TMessage> ReadMessageBeginAsync(CancellationToken cancellationToken)
{
if (cancellationToken.IsCancellationRequested)
{
return await Task.FromCanceled<TMessage>(cancellationToken);
}
return _msgBegin;
}
}
}
}
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