/// <summary>
/// Handles message send failure.
/// </summary>
/// <param name="sender">The communications object that raised the error</param>
/// <param name="args">The message that failed</param>
private void FailedMessage(object sender, MessageEventArgs args)
{
Message message = args.Message;
if (message.Type == MessageType.Login) {
if (!LoggedIn) {
_address = ' ';
}
}
if (message.Type == MessageType.Message) {
//If 6 attempts haven't gotten through, they probably logged out already
_identifiedUsers.Remove(message.Address);
}
}
/// <summary>
/// Triggers the actionable message event
/// </summary>
/// <param name="args">EventArgs object containing the message</param>
private void OnActionableMessageRecieved(MessageEventArgs args)
{
if (ActionableMessageRecieved != null) {
ActionableMessageRecieved(this, args);
}
}
/// <summary>
/// Event handler for recieving a new message.
/// Passes events up to the UI if neccesary, otherwise responds as appropriate
/// </summary>
/// <param name="sender">Communications object that raised the event</param>
/// <param name="args">MessageEventArgs object containing the recieved message</param>
public void RecieveMessage(object sender, MessageEventArgs args)
{
Message message = args.Message;
if (_promiscuous || message.Address == Address || message.SenderAddress == Address) {
if (message.Type == MessageType.Message) {
OnActionableMessageRecieved(args);
}
}
if (message.Type == MessageType.Login) {
if (message.SenderAddress == Address) {
if (LoggedIn) {
Communications.PassOn(message.Acknowledge);
}
else {
_loggedIn = true;
}
}
if (!_identifiedUsers.Contains(message.Address)) {
_identifiedUsers.Add(message.Address);
}
if (message.SenderAddress != Address) {
Communications.PassOn(new Message(null, message.Address, this.Address, MessageType.IdentResponse));
}
OnActionableMessageRecieved(args);
}
if (message.Type == MessageType.Logout) {
if (message.Address == Address) {
_loggedIn = false;
_address = ' ';
}
_identifiedUsers.Remove(message.Address);
OnActionableMessageRecieved(args);
}
if (message.Type == MessageType.IdentResponse) {
if (!_identifiedUsers.Contains(message.SenderAddress)) {
_identifiedUsers.Add(message.SenderAddress);
}
OnActionableMessageRecieved(args);
}
if (message.Type == MessageType.Acknowledge) {
if (!LoggedIn) {
_address = ' ';
OnActionableMessageRecieved(args);
}
}
}
/// <summary>
/// Handles sending messages to other clients from a UI
/// </summary>
/// <param name="sender">The UI object that requested the send</param>
/// <param name="args">The MessageEventArgs object representing the message to send</param>
public void SendMessage(object sender, MessageEventArgs args)
{
Communications.Send(args.Message);
if (args.Message.Address != Address) {
OnActionableMessageRecieved(args);
}
}
/// <summary>
/// Event handler for failed sends
/// </summary>
/// <param name="sender">The communications interface that raised the failure</param>
/// <param name="args">The MessageEventArgs object containing the failed message object</param>
void MessageSendFailed(object sender, MessageEventArgs args)
{
Message message = args.Message;
switch (message.Type) {
case MessageType.Login:
DisplayStatusMessage("Either ident taken or network failure! Try again!");
this.Invoke((Action)(() => RecievedMessagesBox.Enabled = false));
break;
case MessageType.Message:
DisplayStatusMessage("Message '{0}' to {1} send failed!".With(message.Payload, message.Recipient));
DisplayStatusMessage("Assuming {0} is offline.".With(message.Recipient));
this.Invoke((Action) HandleLogin);
break;
}
}
/// <summary>
/// Send a message to all listening clients
/// </summary>
/// <param name="message">The message object to be sent.</param>
private void OnSendMessage(Message message)
{
if (SendMessage!=null) {
MessageEventArgs args = new MessageEventArgs(message);
SendMessage(this, args);
}
}
/// <summary>
/// Event Handler for new displayable message
/// </summary>
/// <param name="sender">The Client object that raised the event</param>
/// <param name="e">The Message Event Args object containing the message object to be displayed</param>
void MessageRecieved(object sender, MessageEventArgs e)
{
Message message = e.Message;
switch (message.Type) {
case MessageType.Message:
DisplayRecievedMessage(message);
break;
case MessageType.Login:
case MessageType.Logout:
DisplayLoginMessage(message);
this.Invoke((Action)HandleLogin);
break;
case MessageType.IdentResponse:
this.Invoke((Action)HandleLogin);
DisplayStatusMessage("{0} is online.".With(message.Sender));
break;
case MessageType.Acknowledge:
DisplayStatusMessage("Ident taken! Try again.");
this.Invoke((Action)(() => RecievedMessagesBox.Enabled = false));
break;
}
_lastRecievedMessage = e.Message;
_lastRecievedOn = DateTime.UtcNow;
}
//
// Event Handlers
//
/// <summary>
/// Event Handler for reciving a message and handling the low-level post-recieve tasks
/// </summary>
/// <param name="sender">This comms object</param>
/// <param name="args">The MessageEventArgs object containing the recieved message</param>
private void RecieveMessage(object sender, MessageEventArgs args)
{
Message message = args.Message;
switch (message.Type) {
case MessageType.Login:
if (message.Address == _parent.Address && message.SenderAddress == _parent.Address) {
Logger.Log("Got my login packet back", _parent.DisplayAddress);
lock (this) {
_pending = _pending.Where(item => item.Message != message).ToList();
}
}
break;
case MessageType.Message:
if (message.Address == _parent.Address) {
Logger.Log("Recieved message '{0}' from {1}".With(message.ToString(), message.Sender), _parent.DisplayAddress);
Logger.Log("Responding to '{0}' with Ack".With(message.ToString()), _parent.DisplayAddress);
PassOn(message.Acknowledge);
}
break;
case MessageType.Acknowledge:
if (message.Address == _parent.Address) {
char address = message.SenderAddress;
Logger.Log("Received Ack from {0}".With(address), _parent.DisplayAddress);
lock (this) {
try {
Message toRemove = _pending.NextTo(address).Message;
Logger.Log("Matched this to message '{0}'".With(toRemove.ToString()), _parent.DisplayAddress);
_pending = _pending.Where(item => item.Message != toRemove).ToList();
}
catch (NullReferenceException) {
Logger.Log("Recieved Ack for unknown packet from {0}!".With(message.SenderAddress), _parent.DisplayAddress);
}
}
}
break;
case MessageType.NotAcknowledgable:
if (message.Address == _parent.Address) {
Logger.Log("Recieved Nack from {0}".With(message.SenderAddress), _parent.DisplayAddress);
Pending pending = _pending.NextTo(message.SenderAddress);
if (pending != null) {
Logger.Log("Matched this to '{0}'".With(pending.Message.ToString()), _parent.DisplayAddress);
pending.LastSend = DateTime.MinValue;
}
}
break;
}
}
/// <summary>
/// Raises a Message Recieved event
/// </summary>
/// <param name="message">The message object to raise</param>
private void OnMessageRecieved(Message message)
{
MessageEventArgs args = new MessageEventArgs(message);
OnMessageRecieved(args);
}
//
//Private Methods and Events
//
/// <summary>
/// Raises a Message Recieved event
/// </summary>
/// <param name="message">The MessageEventArgs object wrapping the Message object to be sent</param>
private void OnMessageRecieved(MessageEventArgs message)
{
if (Recieved != null) {
Recieved(this, message);
}
}
/// <summary>
/// Raises a Message Failed event for when sending was impossible
/// </summary>
/// <param name="args">The MessageEventArgs object wrapping the Message that failed</param>
public void OnMessageFailed(MessageEventArgs args)
{
if (Failed != null) {
Failed(this, args);
}
}