protected override async Task <long> ReadStreamInternal(Stream stream, long?length)
{
await Task.CompletedTask.ConfigureAwait(false);
if (ReadOnly)
{
throw new NotSupportedException();
}
Stream.Position = 0;
using (var skip = new SkipableStream(Stream, 0))
{
long readed;
try
{
readed = skip.ReadFromStream(stream, length);
}
catch (IOException)
{
WebServerLog.Add(ServerLogType.Information, GetType(), "Send", "Connection closed by remote Host");
readed = Stream.Position;
}
Stream.SetLength(readed);
return(readed);
}
}
public virtual void Start()
{
WebServerLog.Add(ServerLogType.Information, GetType(), "StartUp", "Start Server on Port {0}", Settings.Port);
ServerExecution = true;
Listener = new TcpListener(new IPEndPoint(Settings.IPFilter, Settings.Port));
Listener.Start();
ServerThread = new Thread(ServerMainTask)
{
Name = "ServerThread - Port: " + Settings.Port.ToString()
};
ServerThread.Start();
}
protected override async Task <long> WriteStreamInternal(Stream stream, long start, long?stop)
{
await Task.CompletedTask;
Stream.Position = start;
using (var skip = new SkipableStream(Stream, 0))
{
try
{
return(skip.WriteToStream(stream,
stop == null ? null : (long?)(stop.Value - start)));
}
catch (IOException)
{
WebServerLog.Add(ServerLogType.Information, GetType(), "Send", "Connection closed by remote Host");
return(Stream.Position - start);
}
}
}
protected virtual async Task SafeClientStartListen(HttpConnection connection)
{
if (Debugger.IsAttached)
{
await ClientStartListen(connection).ConfigureAwait(false);
}
else
{
try { await ClientStartListen(connection).ConfigureAwait(false); }
catch (Exception e)
{
WebServerLog.Add(
ServerLogType.FatalError,
GetType(),
"Unhandled Exception",
$"{e.GetType().FullName}: {e.Message} in {e.StackTrace}");
}
}
}
public async Task RunAsync(
bool cancelFromConsoleEvent = true,
#if NET5_0_OR_GREATER
bool cancelFromAssemblyUnload = true,
#endif
bool cancelFromConsoleInput = false
)
{
var token = new CancellationTokenSource();
RunToken = token;
if (cancelFromConsoleEvent)
{
Console.CancelKeyPress += (_, e) =>
{
if (token != RunToken)
{
return;
}
e.Cancel = true;
WebServerLog.Add(
ServerLogType.Information,
GetType(),
"cancel",
"console cancel received: {0}",
e.SpecialKey
);
if (!token.IsCancellationRequested)
{
token.Cancel();
}
}
}
;
#if NET5_0_OR_GREATER
if (cancelFromAssemblyUnload)
{
System.Runtime.Loader.AssemblyLoadContext.Default.Unloading += _ =>
{
if (token != RunToken)
{
return;
}
WebServerLog.Add(
ServerLogType.Information,
GetType(),
"cancel",
"assembly unload received"
);
if (!token.IsCancellationRequested)
{
token.Cancel();
}
}
}
;
#endif
if (cancelFromConsoleInput)
{
_ = Task.Run(() =>
{
if (token != RunToken)
{
return;
}
while (Console.Read() != (int)'q')
{
;
}
WebServerLog.Add(
ServerLogType.Information,
GetType(),
"cancel",
"console key q received"
);
if (!token.IsCancellationRequested)
{
token.Cancel();
}
});
}
if (!ServerExecution)
{
Start();
}
try { await Task.Delay(-1, token.Token); }
catch (TaskCanceledException) {}
Stop();
}
protected virtual async Task ClientStartListen(HttpConnection connection)
{
connection.LastWorkTime = -1;
if (connection.NetworkClient != null && connection.NetworkClient.Connected)
{
WebServerLog.Add(ServerLogType.Information, GetType(), "Connection", "Listen to Connection {0}",
connection.NetworkClient?.Client.RemoteEndPoint);
var task = PrepairProgressTask(connection);
if (task == null)
{
WebServerLog.Add(ServerLogType.Information, GetType(), "Connection",
$"Cannot establish data stream to {connection.Ip}");
RemoveConnection(connection);
return;
}
var start = task.Monitor.Enabled ? DateTime.UtcNow : DateTime.MinValue;
try
{
await ExecuteTaskChain(task).ConfigureAwait(false);
}
catch (Exception e)
{
task.Monitor.Current.Log("Unhandled exception: {0}", e);
WebServerLog.Add(ServerLogType.Error, GetType(), "runtime exception", $"unhandled exception: {e}");
throw;
}
finally
{
if (Settings.MonitoringOutputDirectory is string monitorOut && task.Monitor.Enabled)
{
await task.Monitor.Save(monitorOut, start, task);
}
}
if (task.SwitchProtocolHandler != null)
{
KeepAliveConnections.Remove(connection);
AllConnections.Remove(connection);
task.Dispose();
_ = task.SwitchProtocolHandler();
return;
}
if (task.Request.FieldConnection == HttpConnectionType.KeepAlive)
{
if (!KeepAliveConnections.Contains(connection))
{
KeepAliveConnections.Add(connection);
}
}
else
{
RemoveConnection(connection);
}
connection.LastWorkTime = Environment.TickCount;
task.Dispose();
}
else
{
RemoveConnection(connection);
}
}
protected virtual void ServerMainTask()
{
if (Listener == null)
{
return;
}
WebServerLog.Add(ServerLogType.Information, GetType(), "StartUp", "Server successfully started");
var watch = new Stopwatch();
while (ServerExecution)
{
watch.Restart();
//request pending connections
int step = 0;
while (step < 10)
{
if (!Listener.Pending())
{
break;
}
step++;
ClientConnected(Listener.AcceptTcpClient());
}
//request keep alive connections
for (int i = 0; i < KeepAliveConnections.Count; ++i)
{
HttpConnection kas;
try { kas = KeepAliveConnections[i]; }
catch { continue; }
if (kas == null)
{
continue;
}
if ((kas.NetworkClient != null && !kas.NetworkClient.Connected) ||
(kas.LastWorkTime != -1 &&
kas.LastWorkTime + Settings.ConnectionTimeout < Environment.TickCount
)
)
{
kas.NetworkClient?.Close();
kas.NetworkStream?.Dispose();
AllConnections.Remove(kas);
KeepAliveConnections.Remove(kas);
--i;
continue;
}
if (kas.NetworkClient != null && kas.NetworkClient.Available > 0 &&
kas.LastWorkTime != -1
)
{
_ = Task.Run(() => SafeClientStartListen(kas));
}
}
//Warten
if (Listener.Pending())
{
continue;
}
var delay = Settings.ConnectionDelay;
if (delay > TimeSpan.Zero)
{
var time = delay - watch.Elapsed;
if (time <= TimeSpan.Zero)
{
time = delay;
}
Thread.Sleep(time);
}
}
watch.Stop();
Listener.Stop();
for (int i = 0; i < AllConnections.Count; ++i)
{
AllConnections[i].NetworkClient?.Close();
}
AllConnections.Clear();
KeepAliveConnections.Clear();
WebServerLog.Add(ServerLogType.Information, GetType(), "StartUp", "Server successfully stopped");
}
public virtual void Stop()
{
WebServerLog.Add(ServerLogType.Information, GetType(), "StartUp", "Stopped Server");
ServerExecution = false;
ServerThread?.Join();
}
