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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.Threading;
using Thrift.Protocol;
using Thrift.Transport;
using Thrift.Processor;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
#pragma warning disable IDE0079 // net20 - unneeded suppression
#pragma warning disable IDE0290 // net8 - primary CTOR
namespace Thrift.Server
{
// ReSharper disable once InconsistentNaming
public class TSimpleAsyncServer : TServer
{
private volatile bool stop = false;
private CancellationToken ServerCancellationToken;
public TSimpleAsyncServer(ITProcessorFactory itProcessorFactory,
TServerTransport serverTransport,
TTransportFactory inputTransportFactory,
TTransportFactory outputTransportFactory,
TProtocolFactory inputProtocolFactory,
TProtocolFactory outputProtocolFactory,
ILogger logger)
: base(itProcessorFactory,
serverTransport,
inputTransportFactory,
outputTransportFactory,
inputProtocolFactory,
outputProtocolFactory,
logger)
{
}
public TSimpleAsyncServer(ITProcessorFactory itProcessorFactory,
TServerTransport serverTransport,
TTransportFactory inputTransportFactory,
TTransportFactory outputTransportFactory,
TProtocolFactory inputProtocolFactory,
TProtocolFactory outputProtocolFactory,
ILoggerFactory loggerFactory)
: this(itProcessorFactory,
serverTransport,
inputTransportFactory,
outputTransportFactory,
inputProtocolFactory,
outputProtocolFactory,
loggerFactory.CreateLogger<TSimpleAsyncServer>())
{
}
public TSimpleAsyncServer(ITAsyncProcessor processor,
TServerTransport serverTransport,
TProtocolFactory inputProtocolFactory,
TProtocolFactory outputProtocolFactory,
ILoggerFactory loggerFactory)
: this(new TSingletonProcessorFactory(processor),
serverTransport,
null, // defaults to TTransportFactory()
null, // defaults to TTransportFactory()
inputProtocolFactory,
outputProtocolFactory,
loggerFactory.CreateLogger(nameof(TSimpleAsyncServer)))
{
}
public override async Task ServeAsync(CancellationToken cancellationToken)
{
ServerCancellationToken = cancellationToken;
try
{
try
{
ServerTransport.Listen();
}
catch (TTransportException ttx)
{
LogError("Error, could not listen on ServerTransport: " + ttx);
return;
}
//Fire the preServe server event when server is up but before any client connections
if (ServerEventHandler != null)
await ServerEventHandler.PreServeAsync(cancellationToken);
while (!(stop || ServerCancellationToken.IsCancellationRequested))
{
try
{
using (TTransport client = await ServerTransport.AcceptAsync(cancellationToken))
{
await ExecuteAsync(client);
}
}
catch (TaskCanceledException)
{
stop = true;
}
catch (TTransportException ttx)
{
if (!stop || ttx.Type != TTransportException.ExceptionType.Interrupted)
{
LogError(ttx.ToString());
}
}
}
if (stop)
{
try
{
ServerTransport.Close();
}
catch (TTransportException ttx)
{
LogError("TServerTransport failed on close: " + ttx.Message);
}
stop = false;
}
}
finally
{
ServerCancellationToken = default;
}
}
/// <summary>
/// Loops on processing a client forever
/// client will be a TTransport instance
/// </summary>
/// <param name="client"></param>
private async Task ExecuteAsync(TTransport client)
{
var cancellationToken = ServerCancellationToken;
var processor = ProcessorFactory.GetAsyncProcessor(client, this);
TTransport inputTransport = null;
TTransport outputTransport = null;
TProtocol inputProtocol = null;
TProtocol outputProtocol = null;
object connectionContext = null;
try
{
try
{
inputTransport = InputTransportFactory.GetTransport(client);
outputTransport = OutputTransportFactory.GetTransport(client);
inputProtocol = InputProtocolFactory.GetProtocol(inputTransport);
outputProtocol = OutputProtocolFactory.GetProtocol(outputTransport);
//Recover event handler (if any) and fire createContext server event when a client connects
if (ServerEventHandler != null)
connectionContext = await ServerEventHandler.CreateContextAsync(inputProtocol, outputProtocol, cancellationToken);
//Process client requests until client disconnects
while (!(stop || cancellationToken.IsCancellationRequested))
{
if (!await inputTransport.PeekAsync(cancellationToken))
break;
//Fire processContext server event
//N.B. This is the pattern implemented in C++ and the event fires provisionally.
//That is to say it may be many minutes between the event firing and the client request
//actually arriving or the client may hang up without ever makeing a request.
if (ServerEventHandler != null)
await ServerEventHandler.ProcessContextAsync(connectionContext, inputTransport, cancellationToken);
//Process client request (blocks until transport is readable)
if (!await processor.ProcessAsync(inputProtocol, outputProtocol, cancellationToken))
break;
}
}
catch (TTransportException)
{
//Usually a client disconnect, expected
}
catch (Exception x)
{
//Unexpected
LogError("Error: " + x);
}
//Fire deleteContext server event after client disconnects
if (ServerEventHandler != null)
await ServerEventHandler.DeleteContextAsync(connectionContext, inputProtocol, outputProtocol, cancellationToken);
}
finally
{
//Close transports
inputTransport?.Close();
outputTransport?.Close();
// disposable stuff should be disposed
inputProtocol?.Dispose();
outputProtocol?.Dispose();
inputTransport?.Dispose();
outputTransport?.Dispose();
}
}
public override void Stop()
{
stop = true;
ServerTransport?.Close();
}
}
}
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