public async Task InvokeClientMethodAsync(string socketId, string methodName, object[] arguments)
{
object methodParams = null;
if (arguments.Length == 1)
{
methodParams = arguments[0];
}
else
{
methodParams = arguments;
}
// create the method invocation descriptor.
InvocationDescriptor invocationDescriptor = new InvocationDescriptor {
MethodName = methodName, Params = methodParams
};
WebSocketConnection socket = WebSocketConnectionManager.GetSocketById(socketId);
if (socket == null)
{
return;
}
invocationDescriptor.Id = socket.NextCmdId();
var message = new Message()
{
MessageType = MessageType.MethodInvocation,
Data = JsonConvert.SerializeObject(invocationDescriptor)
};
await SendMessageAsync(socketId, message).ConfigureAwait(false);
}
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 <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.
}