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server.cs
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server.cs
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using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Reflection;
using System.Security.AccessControl;
using System.Threading;
using System.Threading.Tasks;
class Server
{
// Port used by server
const int SERVER_PORT = 10000;
private const string SERVER_DIRECTORY = @"D:\Downloads\Torrent\Finished";
// The server lsitener socket
private static TcpListener _Listener = null;
// The logger
private static readonly Logger _Logger = new Logger();
// ServerController
private static readonly ServerController _Controller = new ServerController();
// Process a request
private static readonly Dictionary<Type, Func<object, NetworkStream, Task>> _requestsRoutines = new Dictionary<Type, Func<object, NetworkStream, Task>>()
{
{typeof(object) , DefaultProcessRequest},
{typeof(GetFileRequest) , ProcessFileRequest },
{typeof(GetHttpRequest) , ProcessHttpRequest}
};
static async Task ProcessRequest(object request, NetworkStream client_stream)
{
var type = request.GetType();
Func<object, NetworkStream, Task> func;
func = _requestsRoutines.ContainsKey(type) ? _requestsRoutines[type] : _requestsRoutines[typeof(object)];
try
{
await func(request, client_stream);
}
catch (Exception e)
{
_Logger.Log(String.Format("Error while processing the request: {0}", e.Message));
}
}
static async Task ProcessHttpRequest(object request, NetworkStream client_stream)
{
var req = request as GetHttpRequest;
object response = null;
var exception = false;
_Logger.IncReq();
try
{
_Logger.Log(String.Format("Getting : {0}", req.Uri));
WebResponse webResponse = await HttpWebRequest.Create(req.Uri).GetResponseAsync();
var memoryStream = new MemoryStream();
var stream = webResponse.GetResponseStream();
var buf = new byte[1024];
var count = 0;
while ((count = await stream.ReadAsync(buf, 0, 1024)) != 0)
memoryStream.Write(buf, 0, count);
await MessageUtils.SendMsg(new GetFileResponse(memoryStream.Length), client_stream);
memoryStream.Seek(0, SeekOrigin.Begin);
await MessageUtils.SendFile(memoryStream, client_stream, new CancellationTokenSource());
}
catch (WebException e)
{
exception = true;
response = new GetFileResponse(e.Message);
}
catch (UriFormatException)
{
exception = true;
response = new GetFileResponse("the uri is not valid");
}
catch (TaskCanceledException ex)
{
_Logger.Log("Server: User Cancelled the uri copy");
}
if(exception)
await MessageUtils.SendMsg(response, client_stream);
}
static async Task DefaultProcessRequest(object request, NetworkStream client_stream)
{
await MessageUtils.SendMsg("*** SERVER ERROR: unknown request message", client_stream);
}
static async Task ProcessFileRequest(object request, NetworkStream client_stream)
{
var gfr = request as GetFileRequest;
object response = null;
bool exception = false;
_Logger.IncReq();
var filePath = String.Format("{0}\\{1}", SERVER_DIRECTORY, gfr.FileName);
_Logger.Log(String.Format("Server: get file \"{0}\"", filePath));
try
{
var file = new FileStream(filePath, FileMode.Open, FileSystemRights.Read, FileShare.Read, 4096 * 2, FileOptions.Asynchronous);
//byte[] fbytes = File.ReadAllBytes(filePath);
response = new GetFileResponse(file.Length);
//Send ok message do user
await MessageUtils.SendMsg(response, client_stream);
await MessageUtils.SendFile(file, client_stream, new CancellationTokenSource());
_Logger.Log(String.Format("Server: return file \"{0}\" OK", gfr.FileName));
}
catch (IOException ex)
{
exception = true;
response = new GetFileResponse(ex.Message);
_Logger.Log(String.Format("Server: error on get file \"{0}\": {1}",
gfr.FileName, ex.Message));
}
catch (TaskCanceledException ex)
{
_Logger.Log("Server: User Cancelled the file copy");
}
if (exception)
await MessageUtils.SendMsg(response, client_stream);
}
// Handler for CTRL-C
// -- Closes the server listener, stops the logger and exits
// server main method
static void Main(string[] args)
{
ServerStartAsync();
Console.Read();
_Logger.Log("Server shutting down");
_Listener.Stop();
_Controller.ShoutDown();
_Logger.Stop();
Console.ReadLine();
}
static void ServerStartAsync()
{
_Logger.Start();
try
{
_Listener = new TcpListener(IPAddress.Any, SERVER_PORT);
_Listener.Start();
_Logger.Log("server: ready to accept requests");
_Logger.Log(String.Format("server: running on {0}", SERVER_DIRECTORY));
AcceptClientsAsync(_Logger);
}
catch (SocketException ex)
{
_Logger.Log(String.Format("Server exception: {0}", ex));
}
}
static async void AcceptClientsAsync(Logger logger)
{
bool entered = false;
TcpClient client = null;
try
{
client = await _Listener.AcceptTcpClientAsync();
entered = true;
_Controller.ClientEntered();
AcceptClientsAsync(logger);
logger.Log("Client " + client.Client.RemoteEndPoint);
NetworkStream client_stream = client.GetStream();
// Get the request message
object request = await MessageUtils.RecvMsg(client_stream);
// Process the request message and send the response
await ProcessRequest(request, client_stream);
}
catch (SocketException ex)
{
logger.Log(String.Format("Server exception: {0}", ex));
}
catch (ObjectDisposedException) { }
catch (Exception ex)
{
logger.Log(String.Format("Server exception: {0}", ex));
}
finally
{
if (entered)
{
if (client != null)
try
{
(client as IDisposable).Dispose();
}
catch (ObjectDisposedException) { }
_Controller.ClientExiting();
}
}
}
public class ServerController
{
private volatile int _currClients;
private volatile bool _isShuttingDown;
public void ClientEntered()
{
Interlocked.Increment(ref _currClients);
}
public void ClientExiting()
{
if (Interlocked.Decrement(ref _currClients) == 0 && _isShuttingDown)
{
lock (this)
Monitor.Pulse(this);
}
}
public void ShoutDown()
{
_isShuttingDown = true;
if (_currClients == 0)
return;
lock (this)
while (_currClients != 0)
Monitor.Wait(this);
}
}
}