[server] Add BroadcastPlane

Nibriboard/Client/NibriClient.cs

@@ -42,7 +42,7 @@ namespace Nibriboard.Client
 		/// <summary>
 		/// The plane that this client is currently on.
 		/// </summary>
-		private Plane currentPlane;
+		public Plane CurrentPlane;
 
 		/// <summary>
 		/// The underlying websocket connection to the client.
@@ -304,13 +304,13 @@ namespace Nibriboard.Client
 		protected ClientStatesMessage GenerateClientStateUpdate()
 		{
 			ClientStatesMessage result = new ClientStatesMessage();
-			foreach (NibriClient client in manager.Clients)
+			foreach (NibriClient otherClient in manager.Clients)
 			{
 				// Don't include ourselves in the update message!
-				if (client == this)
+				if (otherClient == this)
 					continue;
 				
-				result.ClientStates.Add(client.GenerateStateSnapshot());
+				result.ClientStates.Add(otherClient.GenerateStateSnapshot());
 			}
 			return result;
 		}
@@ -320,7 +320,12 @@ namespace Nibriboard.Client
 		/// </summary>
 		protected async Task SendChunks(params ChunkReference[] chunkRefs)
 		{
-
+			if(CurrentPlane == default(Plane))
+			{
+				Send(new ExceptionMessage("You're not on a plane yet, so you can't request chunks." +
+				                          "Try joining a plane and sending that request again.");
+				return;
+			}
 		}
 	}
 }

Nibriboard/Client/NibriClientManager.cs

@@ -90,7 +90,29 @@ namespace Nibriboard.Client
 				client.Send(message);
 			}
 		}
+		/// <summary>
+		/// Sends a message to everyone on the same plane as the sender, except the sender themselves.
+		/// </summary>
+		/// <param name="sendingClient">The sending client.</param>
+		/// <param name="message">The message to send.</param>
+		public void BroadcastPlane(NibriClient sendingClient, Message message)
+		{
+			foreach(NibriClient client in Clients)
+			{
+				// Don't send the message to the sender
+				if(client == sendingClient)
+					continue;
+				// Only send the message to others on the same plane
+				if(client.CurrentPlane != sendingClient.CurrentPlane)
+					continue;
 
+				client.Send(message);
+			}
+		}
+
+		/// <summary>
+		/// Periodically tidies up the client list, disconnecting old clients.
+		/// </summary>
 		private async Task ClientMaintenanceMonkey()
 		{
 			while (true) {