/// <summary>
/// Send a message.
/// </summary>
public void SendMessage(string stringToSend)
{
//If we have tried to send a zero length string we just return
if (stringToSend.Trim() == "") return;
//We may or may not have entered some server connection information
ConnectionInfo serverConnectionInfo = null;
if (ServerIPAddress != "")
{
try { serverConnectionInfo = new ConnectionInfo(ServerIPAddress, ServerPort); }
catch (Exception)
{
ShowMessage("Failed to parse the server IP and port. Please ensure it is correct and try again");
return;
}
}
//We wrap everything we want to send in the ChatMessage class we created
ChatMessage chatMessage = new ChatMessage(NetworkComms.NetworkIdentifier, LocalName, stringToSend, messageSendIndex++);
//We add our own message to the message history in case it gets relayed back to us
lock (lastPeerMessageDict) lastPeerMessageDict[NetworkComms.NetworkIdentifier] = chatMessage;
//We write our own message to the chatBox
AppendLineToChatHistory(chatMessage.SourceName + " - " + chatMessage.Message);
//Clear the input box text
ClearInputLine();
//If we provided server information we send to the server first
if (serverConnectionInfo != null)
{
//We perform the send within a try catch to ensure the application continues to run if there is a problem.
try
{
if (ConnectionType == ConnectionType.TCP)
TCPConnection.GetConnection(serverConnectionInfo).SendObject("ChatMessage", chatMessage);
else if (ConnectionType == ConnectionType.UDP)
UDPConnection.GetConnection(serverConnectionInfo, UDPOptions.None).SendObject("ChatMessage", chatMessage);
else
throw new Exception("An invalid connectionType is set.");
}
catch (CommsException) { AppendLineToChatHistory("Error: A communication error occurred while trying to send message to " + serverConnectionInfo + ". Please check settings and try again."); }
catch (Exception) { AppendLineToChatHistory("Error: A general error occurred while trying to send message to " + serverConnectionInfo + ". Please check settings and try again."); }
}
//If we have any other connections we now send the message to those as well
//This ensures that if we are the server everyone who is connected to us gets our message
//We want a list of all established connections not including the server if set
List<ConnectionInfo> otherConnectionInfos;
if (serverConnectionInfo != null)
otherConnectionInfos = (from current in NetworkComms.AllConnectionInfo() where current.RemoteEndPoint != serverConnectionInfo.RemoteEndPoint select current).ToList();
else
otherConnectionInfos = NetworkComms.AllConnectionInfo();
foreach (ConnectionInfo info in otherConnectionInfos)
{
//We perform the send within a try catch to ensure the application continues to run if there is a problem.
try
{
if (ConnectionType == ConnectionType.TCP)
TCPConnection.GetConnection(info).SendObject("ChatMessage", chatMessage);
else if (ConnectionType == ConnectionType.UDP)
UDPConnection.GetConnection(info, UDPOptions.None).SendObject("ChatMessage", chatMessage);
else
throw new Exception("An invalid connectionType is set.");
}
catch (CommsException) { AppendLineToChatHistory("Error: A communication error occurred while trying to send message to " + info + ". Please check settings and try again."); }
catch (Exception) { AppendLineToChatHistory("Error: A general error occurred while trying to send message to " + info + ". Please check settings and try again."); }
}
return;
}
public static void Deserialize(System.IO.Stream inputStream, out ChatMessage result)
{
result = new ChatMessage();
result.Deserialize(inputStream);
}
/// <summary>
/// Performs whatever functions we might so desire when we receive an incoming ChatMessage
/// </summary>
/// <param name="header">The PacketHeader corresponding with the received object</param>
/// <param name="connection">The Connection from which this object was received</param>
/// <param name="incomingMessage">The incoming ChatMessage we are after</param>
protected virtual void HandleIncomingChatMessage(PacketHeader header, Connection connection, ChatMessage incomingMessage)
{
//We only want to write a message once to the chat window
//Because we support relaying and may receive the same message twice from multiple sources
//we use our history and message indexes to ensure we have a new message
//We perform this action within a lock as HandleIncomingChatMessage could be called in parallel
lock (lastPeerMessageDict)
{
if (lastPeerMessageDict.ContainsKey(incomingMessage.SourceIdentifier))
{
if (lastPeerMessageDict[incomingMessage.SourceIdentifier].MessageIndex < incomingMessage.MessageIndex)
{
//If this message index is greater than the last seen from this source we can safely
//write the message to the ChatBox
AppendLineToChatHistory(incomingMessage.SourceName + " - " + incomingMessage.Message);
//We now replace the last received message with the current one
lastPeerMessageDict[incomingMessage.SourceIdentifier] = incomingMessage;
}
}
else
{
//If we have never had a message from this source before then it has to be new
//by definition
lastPeerMessageDict.Add(incomingMessage.SourceIdentifier, incomingMessage);
AppendLineToChatHistory(incomingMessage.SourceName + " - " + incomingMessage.Message);
}
}
//This last section of the method is the relay feature
//We start by checking to see if this message has already been relayed the maximum number of times
if (incomingMessage.RelayCount < relayMaximum)
{
//If we are going to relay this message we need an array of
//all known connections, excluding the current one
var allRelayConnections = (from current in NetworkComms.GetExistingConnection() where current != connection select current).ToArray();
//We increment the relay count before we send
incomingMessage.IncrementRelayCount();
//We now send the message to every other connection
foreach (var relayConnection in allRelayConnections)
{
//We ensure we perform the send within a try catch
//To ensure a single failed send will not prevent the
//relay to all working connections.
try { relayConnection.SendObject("ChatMessage", incomingMessage); }
catch (CommsException) { /* Catch the general comms exception, ignore and continue */ }
}
}
}
public static void Deserialize(System.IO.Stream inputStream, out ChatMessage result)
{
result = new ChatMessage();
result.Deserialize(inputStream);
}