public async Task SendClientNotifyAsync(string socketId, string methodName, object result)
{
// create the method invocation descriptor.
InvocationDescriptor invocationDescriptor = new InvocationDescriptor {
MethodName = methodName, Params = result
};
WebSocketConnection socket = WebSocketConnectionManager.GetSocketById(socketId);
if (socket == null)
{
return;
}
var message = new Message()
{
MessageType = MessageType.MethodInvocation,
Data = JsonConvert.SerializeObject(invocationDescriptor)
};
await SendMessageAsync(socketId, message).ConfigureAwait(false);
}
private async Task Receive(WebSocketConnection socket, Action <WebSocketReceiveResult, string> handleMessage)
{
while (socket.WebSocket.State == WebSocketState.Open)
{
ArraySegment <Byte> buffer = new ArraySegment <byte>(new Byte[1024 * 4]);
string message = null;
WebSocketReceiveResult result = null;
try
{
using (var ms = new MemoryStream())
{
do
{
result = await socket.WebSocket.ReceiveAsync(buffer, CancellationToken.None).ConfigureAwait(false);
ms.Write(buffer.Array, buffer.Offset, result.Count);
}while (!result.EndOfMessage);
ms.Seek(0, SeekOrigin.Begin);
using (var reader = new StreamReader(ms, Encoding.UTF8))
{
message = await reader.ReadToEndAsync().ConfigureAwait(false);
}
}
handleMessage(result, message);
}
catch (WebSocketException e)
{
if (e.WebSocketErrorCode == WebSocketError.ConnectionClosedPrematurely)
{
socket.WebSocket.Abort();
}
}
}
await _webSocketHandler.OnDisconnected(socket);
}
public async Task SendClientErrorAsync(string socketId, string methodName, RemoteException error)
{
// create the method invocation descriptor.
InvocationResult invocationResult = new InvocationResult {
MethodName = methodName, Exception = error
};
WebSocketConnection socket = WebSocketConnectionManager.GetSocketById(socketId);
if (socket == null)
{
return;
}
invocationResult.Id = socket.NextCmdId();
var message = new Message()
{
MessageType = MessageType.MethodInvocation,
Data = JsonConvert.SerializeObject(invocationResult)
};
await SendMessageAsync(socketId, message).ConfigureAwait(false);
}
public async Task OnReceivedTextAsync(WebSocketConnection socket, string serializedMessage)
{
InvocationDescriptor invocationDescriptor = null;
try
{
invocationDescriptor = JsonConvert.DeserializeObject <InvocationDescriptor>(serializedMessage);
//invocationDescriptor = JsonConvert.DeserializeObject<InvocationDescriptor>(serializedMessage, _jsonSerializerSettings);
//invocationDescriptor = JsonConvert.DeserializeObject<InvocationDescriptor>(receivedMessage.Data, _jsonSerializerSettings);
if (invocationDescriptor == null)
{
return;
}
}
catch (Exception ex)
{
return;
} // ignore invalid data sent to the server.
// method invocation request.
if (invocationDescriptor.Params != null)
{
// retrieve the method invocation request.
// if the unique identifier hasn't been set then the client doesn't want a return value.
if (invocationDescriptor.Id == 0)
{
// invoke the method only.
try
{
await MethodInvocationStrategy.OnInvokeMethodReceivedAsync(socket.Id, invocationDescriptor);
}
catch (Exception)
{
// we consume all exceptions.
}
}
else
{
// invoke the method and get the result.
InvocationResult invokeResult;
try
{
// create an invocation result with the results.
invokeResult = new InvocationResult()
{
MethodName = invocationDescriptor.MethodName,
Id = invocationDescriptor.Id,
Result = await MethodInvocationStrategy.OnInvokeMethodReceivedAsync(socket.Id, invocationDescriptor),
Exception = null
};
}
// send the exception as the invocation result if there was one.
catch (Exception ex)
{
invokeResult = new InvocationResult()
{
MethodName = invocationDescriptor.MethodName,
Id = invocationDescriptor.Id,
Result = null,
Exception = new RemoteException(ex)
};
}
string json = JsonConvert.SerializeObject(invokeResult);
// send a message to the client containing the result.
var message = new Message()
{
MessageType = MessageType.MethodReturnValue,
Data = json
//Data = JsonConvert.SerializeObject(invokeResult, _jsonSerializerSettings)
};
await SendMessageAsync(socket, message).ConfigureAwait(false);
}
}
else
{
await OnResponseAsync(socket, serializedMessage);
}
}
/// <summary>
/// Called when a client has disconnected from the server.
/// </summary>
/// <param name="socket">The web-socket of the client.</param>
/// <returns>Awaitable Task.</returns>
public virtual async Task OnDisconnected(WebSocketConnection socket)
{
await WebSocketConnectionManager.RemoveSocket(WebSocketConnectionManager.GetId(socket)).ConfigureAwait(false);
}
public async Task <T> InvokeClientMethodAsync <T>(string socketId, string methodName, object[] arguments)
{
// create the method invocation descriptor.
object methodParams = null;
if (arguments.Length == 1)
{
methodParams = arguments[0];
}
else
{
methodParams = arguments;
}
InvocationDescriptor invocationDescriptor = new InvocationDescriptor {
MethodName = methodName, Params = methodParams
};
WebSocketConnection socket = WebSocketConnectionManager.GetSocketById(socketId);
// generate a unique identifier for this invocation.
if (socket == null)
{
return(default(T));
}
invocationDescriptor.Id = socket.NextCmdId(); // Guid.NewGuid();
// add ourselves to the waiting list for return values.
TaskCompletionSource <InvocationResult> task = new TaskCompletionSource <InvocationResult>();
// after a timeout of 60 seconds we will cancel the task and remove it from the waiting list.
new CancellationTokenSource(1000 * 60).Token.Register(() => { _waitingRemoteInvocations[socketId].Remove(invocationDescriptor.Id); task.TrySetCanceled(); });
if (!_waitingRemoteInvocations.ContainsKey(socketId))
{
_waitingRemoteInvocations[socketId] = new Dictionary <long, TaskCompletionSource <InvocationResult> >();
}
_waitingRemoteInvocations[socketId].Add(invocationDescriptor.Id, task);
// send the method invocation to the client.
var message = new Message()
{
MessageType = MessageType.MethodInvocation,
//Data = JsonConvert.SerializeObject(invocationDescriptor, _jsonSerializerSettings)
Data = JsonConvert.SerializeObject(invocationDescriptor)
};
await SendMessageAsync(socketId, message).ConfigureAwait(false);
// wait for the return value elsewhere in the program.
InvocationResult result = await task.Task;
// ... we just got an answer.
// if we have completed successfully:
if (task.Task.IsCompleted)
{
// there was a remote exception so we throw it here.
if (result.Exception != null)
{
throw new Exception(result.Exception.Message);
}
// return the value.
// support null.
if (result.Result == null)
{
return(default(T));
}
// cast anything to T and hope it works.
return((T)result.Result);
}
// if we reach here we got cancelled or alike so throw a timeout exception.
throw new TimeoutException(); // todo: insert fancy message here.
}
public virtual async Task OnReceivedBinaryAsync(WebSocketConnection socket, string receivedMessage)
{
}
public string GetId(WebSocketConnection socket)
{
return(_sockets.FirstOrDefault(p => p.Value == socket).Key);
}
public void AddSocket(WebSocketConnection socket)
{
_sockets.TryAdd(socket.Id, socket);
}
public void Close(WebSocketConnection socket)
{
CloseAsync(socket).Wait();
}
public async Task CloseAsync(WebSocketConnection socket)
{
_sockets.TryRemove(socket.ID, out WebSocketConnection throwAwayValue);
await socket.CloseAsync();
}
internal void Add(WebSocketConnection socket)
{
_sockets.TryAdd(socket.ID, socket);
OnOpened(socket);
}
public virtual void OnMessage(WebSocketConnection socket, ArraySegment <byte> bytes)
{
}
public virtual void OnMessage(WebSocketConnection socket, string message)
{
}
public virtual void OnClosed(WebSocketConnection socket)
{
}
public virtual void OnOpened(WebSocketConnection socket)
{
}
