/// <summary>
/// Event handler that occurs whenever we recieve a response from the host.
/// Executes the associated callback if nessesary.
/// </summary>
private void ReceivedResponse(CommunicationMessage message)
{
if (!IsMe(message.To))
{
DebugMessage?.Invoke($"Received an invalid response: addressed to someone other than me - to: {message.To.Name}, {message.Type}, from {message.From.Name})");
return;
}
CurrentStatus.LastResponseReceived = DateTime.UtcNow;
var responseData = message.GetValue <ResponseMessage>();
DebugMessage?.Invoke($"{message.To.Name} << Received ({message.Type}) from {message.From.Name}: {responseData.ResponseText}");
switch (message.From.Role)
{
case IdentityRole.Host:
if (responseData.Clients.Any())
{
UpdateClientList(responseData);
}
break;
case IdentityRole.Client:
RequestClientListFromHost();
break;
}
FireCallbacks(message, responseData);
}
private void SendBroadcastInternal(CommunicationMessage message, Action <CallbackArgs> responseHandler)
{
foreach (var client in Clients)
{
SendMessage(message, client.Identity, responseHandler);
}
}
/// <summary>
/// Actually send a message.
/// </summary>
private void SendMessageInternal(CommunicationMessage message, Identity to = null)
{
try
{
var senderId = message.From.Equals(ClientDevice.Identity) ? message.From : _hostId;
var receiverId = to ?? _hostId;
//var uri = to?.Role == IdentityRole.Client && !to.Equals(HostDevice.Identity) ? HostDevice.GetUri(to) : HostDevice.Uri;
var uri = to?.Address ?? HostDevice.Uri;
var binding = HostDevice.CreateBinding();
var proxy = ChannelFactory <ITransmissionService> .CreateChannel(binding, new EndpointAddress(uri));
message.Sent = DateTime.UtcNow;
message.To = receiverId;
Task.Run(() =>
{
DebugMessage?.Invoke($"{senderId.Name} >> Sending {message.Name} ({message.Type}) to {receiverId.Name}");
CurrentStatus.LastSendTime = DateTime.UtcNow;
try
{
proxy.SendData(TransmissionService.PrepareMessage(message));
}
//catch (EndpointNotFoundException ex)
catch (Exception ex)
{
DebugMessage?.Invoke($"Exception: {ex.GetType().Name} {ex.Message}");
}
});
}
catch (Exception ex)
{
DebugMessage?.Invoke($"Exception: {ex.GetType().Name} {ex.Message}");
}
}
/// <summary>
/// Keep track of who sent a message
/// </summary>
private void UpdateHostClientList(Identity id, CommunicationMessage message = null)
{
var found = false;
foreach (var client in _hostClientsList.ToList())
{
if (client.Identity.Equals(id))
{
found = true;
client.State = ClientState.Active;
client.LastMessage = message;
}
else if (DateTime.UtcNow.Subtract(client.LastMessage.Received) > ClientExpiryTime)
{
_hostClientsList.Remove(client);
}
else if (DateTime.UtcNow.Subtract(client.LastMessage.Received) > ClientInactiveTime)
{
client.State = ClientState.Inactive;
}
}
if (!found)
{
DebugMessage?.Invoke($"{_hostId.Name}: Adding new client information - {id}");
_hostClientsList.Add(new RemoteClient(id, message));
}
}
/// <summary>
/// Send message to all clients.
/// </summary>
public void SendMessage(CommunicationMessage message, Action <CallbackArgs> responseHandler = null)
{
if (TryValidateConnection(message, null, args => SendBroadcastInternal(message, responseHandler)))
{
return;
}
SendBroadcastInternal(message, responseHandler);
}
/// <summary>
/// Send a message to a specific client.
/// </summary>
public void SendMessage(CommunicationMessage message, Identity to, Action <CallbackArgs> responseHandler = null)
{
if (TryValidateConnection(message, to, responseHandler))
{
return;
}
AddCallback(message, responseHandler);
SendMessageInternal(message, to);
}
/// <summary>
/// Send a message on the host channel to see if we get a response.
/// </summary>
public void Ping()
{
var msg = new CommunicationMessage
{
Name = "Ping",
From = _clientId
};
AddCallback(msg, HandlePingSuccess);
SendMessageInternal(msg);
DebugMessage?.Invoke($"Ping...");
}
private void ServiceOnDataReceived(CommunicationMessage message)
{
switch (message.Type)
{
case MessageType.Response:
ResponseReceived?.Invoke(message);
break;
default:
MessageReceived?.Invoke(message);
break;
}
}
private void FireCallbacks(CommunicationMessage message, ResponseMessage responseData)
{
if (_callbacks.ContainsKey(message.CallbackId))
{
var args = new CallbackArgs
{
OriginalMessage = message,
Response = responseData
};
_callbacks[message.CallbackId]?.Callback.Invoke(args);
_callbacks.Remove(message.CallbackId);
}
}
/// <summary>
/// Prepare a function and identify it with an ID in the message,
/// so that it can be executed later when the host responds.
/// </summary>
private void AddCallback(CommunicationMessage message, Action <CallbackArgs> responseHandler)
{
if (responseHandler != null && message != null)
{
var pid = Guid.NewGuid();
_callbacks.Add(pid, new PendingCallback
{
Guid = pid,
Created = DateTime.UtcNow,
Callback = responseHandler
});
message.CallbackId = pid;
}
}
private bool TryValidateConnection(CommunicationMessage message, Identity to, Action <CallbackArgs> action)
{
if (DateTime.UtcNow.Subtract(CurrentStatus.LastResponseReceived) > SyncInterval)
{
if (to != null)
{
_actionQueue.Enqueue(new QueuedAction(args => SendMessage(message, to, action)));
}
else if (action != null)
{
_actionQueue.Enqueue(new QueuedAction(action));
}
Sync();
return(true);
}
return(false);
}
private void SendResponse(Identity from, CommunicationMessage message, List <RemoteClient> clientList = null)
{
var msg = new CommunicationMessage
{
From = from,
CallbackId = message.CallbackId,
Type = MessageType.Response
};
msg.SetValue(new ResponseMessage
{
From = _clientId,
Clients = clientList ?? new List <RemoteClient>(),
ResponseText = "Acknowledged",
Result = true
});
SendMessageInternal(msg, message.From);
}
private void ReceivedMessage(CommunicationMessage message)
{
if (!IsMe(message.To))
{
DebugMessage?.Invoke($"Received an invalid message: addressed to someone other than me - to: {message.To.Name}, {message.Type}, from {message.From.Name})");
return;
}
DebugMessage?.Invoke($"{message.To.Name} << Received ({message.Type}) from {message.From.Name}");
if (message.To.Role == IdentityRole.Host && !message.From.Equals(_hostId))
{
UpdateHostClientList(message.From, message);
}
else
{
RequestClientListFromHost();
}
SendResponse(message.To, message, _hostClientsList);
}
public static byte[] PrepareMessage(CommunicationMessage msg) => GetBytes(msg.Serialize());
public static CommunicationMessage GetMessage(byte[] bytes) => CommunicationMessage.Deserialize(GetString(bytes));
public RemoteClient(Identity identity, CommunicationMessage message = null)
{
Identity = identity;
LastMessage = message;
}
