/// <summary>
/// Wait on connection and received messages
/// </summary>
protected virtual void ReceiveAction()
{
try
{
using (NamedPipeServerStream serverStream =
new NamedPipeServerStream(
PipeName,
PipeDirection.InOut,
NumberOfThreads,
PipeTransmissionMode.Byte,
PipeOptions.Asynchronous))
{
Task t = serverStream.WaitForConnectionAsync(CancellationToken.Token);
t.GetAwaiter().GetResult();
Guid id = Guid.NewGuid();
IpcStream stream = new IpcStream(serverStream, KnownTypes);
while (ProcessMessage(stream, id))
{
}
StatefulProxy.NotifyDisconnect(id);
}
// Todo: make sure there's a new listener, even when this isn't reached
serverTask.Add(Task.Factory.StartNew(ReceiveAction));
}
catch (OperationCanceledException) { }
}
/// <summary>
/// Establish the TCP connection asynchonously
/// </summary>
/// <param name="keepalive">Wether the connection should be kept alive after a first message</param>
/// <returns>True for success, False otherwise</returns>
public async Task <bool> ConnectAsync(bool keepalive = true)
{
try
{
// connect socket
connection = new System.Net.Sockets.TcpClient();
connection.NoDelay = true;
connection.ReceiveTimeout = 2000;
await connection.ConnectAsync(EndPoint.Address, EndPoint.Port).ConfigureAwait(false);
System.IO.Stream connectionStream = connection.GetStream();
Stream = new IpcStream(connectionStream, KnownTypes, Encryptor);
}
catch (SocketException e)
{
System.Diagnostics.Debug.WriteLine(e);
return(false);
}
if (keepalive)
{
StartPing();
}
return(true);
}
/// <summary>
/// Main connection loop, waits for and handles connections
/// </summary>
protected override void ReceiveAction()
{
try
{
var t = listener.AcceptTcpClientAsync(CancellationToken.Token);
// wait for connection
using (System.Net.Sockets.TcpClient client = t.GetAwaiter().GetResult())
{
// Start new connection waiter before anything can go wrong here,
// leaving us without a server
serverTask.Add(Task.Factory.StartNew(ReceiveAction));
using (NetworkStream networkStream = client.GetStream())
{
networkStream.ReadTimeout = Server.ReadTimeOut;
Stream serverStream = networkStream;
Guid id = Guid.NewGuid();
IpcStream stream = new IpcStream(serverStream, KnownTypes, Encryptor);
// process incoming messages until disconnect
while (ProcessMessage(stream, id))
{
}
StatefulProxy.NotifyDisconnect(id);
serverStream.Close();
}
}
}
catch (OperationCanceledException) { }
}
/// <summary>
/// Scans the service interface and registers custom proxy class
/// </summary>
/// <typeparam name="T">Service interface, must equal server-side</typeparam>
/// <returns>Proxy class for remote calls</returns>
public void RegisterServiceProxy <T>(Proxy <T> customProxy)
{
// check if service implements interface
if (customProxy.GetType().GetInterface(typeof(T).Name) == null)
{
throw new InvalidOperationException("Custom Proxy class does not implement service interface");
}
IpcStream.ScanInterfaceForTypes(typeof(T), KnownTypes);
}
/// <summary>
/// Register a service interface on the server
/// This is a one instance for all clients service
/// </summary>
/// <typeparam name="T">The interface of the service</typeparam>
/// <param name="instance">Instance of a class implementing the service</param>
public void RegisterService <T>(T instance)
{
if (!typeof(T).IsInterface)
{
throw new InvalidOperationException("Service Type is not an interface");
}
if (!(instance is T))
{
throw new InvalidOperationException("Instance must implement service interface");
}
services[typeof(T).Name] = instance;
types[typeof(T).Name] = typeof(T);
IpcStream.ScanInterfaceForTypes(typeof(T), KnownTypes);
}
/// <summary>
/// Establish the TCP connection
/// </summary>
/// <param name="keepalive">Wether the connection should be kept alive after a first message</param>
/// <returns>True for success, False otherwise</returns>
public override bool Connect(bool keepalive = true)
{
try
{
// connect socket
connection = new System.Net.Sockets.TcpClient();
connection.ReceiveTimeout = 2000;
connection.Connect(EndPoint);
System.IO.Stream connectionStream = connection.GetStream();
Stream = new IpcStream(connectionStream, KnownTypes, Encryptor);
} catch (SocketException e)
{
System.Diagnostics.Debug.WriteLine(e);
return(false);
}
if (keepalive)
{
StartPing();
}
return(true);
}
/// <summary>
/// Register a service interface on the server that keeps its state for a connection
/// This a one instance for one client/connection service
/// </summary>
/// <typeparam name="T">The interface of the service</typeparam>
/// <param name="t">Type of the class implementing the service, should have a default constructor
/// which will be called on connection of a new client</param>
public void RegisterStatefulService <T>(Type t)
{
if (!typeof(T).IsInterface)
{
throw new InvalidOperationException("Service Type is not an interface");
}
// check if service implements interface
if (t.GetInterface(typeof(T).Name) == null)
{
throw new InvalidOperationException("Instance must implement service interface");
}
// check for default constructor
if (t.GetConstructor(Type.EmptyTypes) == null || t.IsAbstract)
{
throw new InvalidOperationException("Stateful service requires default constructor");
}
services[typeof(T).Name] = new StatefulProxy(t);
types[typeof(T).Name] = typeof(T);
IpcStream.ScanInterfaceForTypes(typeof(T), KnownTypes);
}
/// <summary>
/// Connect to server. This opens a persistent connection allowing multiple remote calls
/// until <see cref="Disconnect(bool)"/> is called.
/// </summary>
/// <param name="keepalive">Whether to send pings over the connection to keep it alive</param>
/// <returns>True if succeeded, false if not</returns>
public virtual bool Connect(bool keepalive = true)
{
NamedPipeClientStream source = new NamedPipeClientStream(
".",
PipeName,
PipeDirection.InOut,
PipeOptions.Asynchronous);
try
{
source.Connect(500);
} catch (TimeoutException)
{
return(false);
}
Stream = new IpcStream(source, KnownTypes);
if (keepalive)
{
StartPing();
}
return(true);
}
/// <summary>
/// Process a received message by calling the corresponding method on the service instance and
/// returning the return value over the network.
/// </summary>
/// <param name="stream">The message stream</param>
/// <param name="streamId">A GUID identifying this connection</param>
public bool ProcessMessage(IpcStream stream, Guid streamId)
{
IpcMessage msg = stream.ReadMessage();
// this was a close-connection notification
if (msg.StatusMsg == StatusMessage.CloseConnection)
{
return(false);
}
// or this is just a keepalive ping
else if (msg.StatusMsg == StatusMessage.Ping)
{
return(true);
}
bool processedOk = false;
string error = "";
object rv = null;
IpcMessage returnMsg = new IpcMessage();
// find the service
if (services.TryGetValue(msg.Service, out object instance) && instance != null)
{
// double check method existence against type-list for security
// typelist will contain interfaces instead of instances
if (types[msg.Service].GetMethod(msg.Method) != null)
{
// separate handling for stateful service
if (instance is StatefulProxy)
{
try
{
// invoke method
System.Reflection.MethodInfo method =
(instance as StatefulProxy).Type.GetMethod(msg.Method);
if (method == null)
{
throw new InvalidOperationException("Method not found in stateful proxy");
}
rv = (instance as StatefulProxy).Invoke(streamId, method, msg.Parameters);
processedOk = true;
// check if encryption is required
if (Attribute.IsDefined(method, typeof(EncryptIfTrueAttribute)) &&
(bool)rv == true)
{
returnMsg.StatusMsg = StatusMessage.Encrypt;
}
}
catch (Exception e) { error = e.ToString(); }
}
else
{
// get the method
System.Reflection.MethodInfo method = instance.GetType().GetMethod(msg.Method);
if (method != null)
{
try
{
// invoke method
rv = method.Invoke(instance, msg.Parameters);
processedOk = true;
// check if encryption is required
if (Attribute.IsDefined(method, typeof(EncryptIfTrueAttribute)) &&
(bool)rv == true)
{
returnMsg.StatusMsg = StatusMessage.Encrypt;
}
}
catch (Exception e) { error = e.ToString(); }
}
else
{
error = "Could not find method";
}
}
}
else
{
error = "Could not find method in type";
}
}
else
{
error = "Could not find service";
}
// return either return value or error message
if (processedOk)
{
returnMsg.Return = rv;
}
else
{
returnMsg.Error = error;
returnMsg.StatusMsg = StatusMessage.None;
}
stream.WriteMessage(returnMsg);
// if there's more to come, keep reading a next message
if (msg.StatusMsg == StatusMessage.KeepAlive)
{
return(true);
}
else // otherwise close the connection
{
return(false);
}
}
/// <summary>
/// Scans the service interface and builds proxy class
/// </summary>
/// <typeparam name="T">Service interface, must equal server-side</typeparam>
/// <returns>Proxy class for remote calls</returns>
public T GetServiceProxy <T>()
{
IpcStream.ScanInterfaceForTypes(typeof(T), KnownTypes);
return((T) new ProxyGenerator().CreateInterfaceProxyWithoutTarget(typeof(T), new Proxy <T>(this)));
}
