Increased server stability

Fixed NPE in IoEventHandler
Fixed NPEs in PacketWriteQueue
Reworked PacketWriteQueue slightly so that instead of breaking at first null packet we continue past it and pop the whole queue along the way

Server/src/main/java/core/net/IoEventHandler.java

@@ -72,7 +72,8 @@ public class IoEventHandler {
 		} catch (IOException e) {
 			if (e.getMessage().contains("reset by peer")) {
 				session.disconnect();
-				session.getPlayer().clear(true);
+				if (session.getPlayer() != null)
+					session.getPlayer().clear(true);
 			} else e.printStackTrace();
 		}
 		buffer.flip();

Server/src/main/kotlin/rs09/net/packet/PacketWriteQueue.kt

@@ -6,6 +6,7 @@ import core.net.packet.out.*
 import rs09.game.system.SystemLogger
 import java.util.*
 import java.util.concurrent.locks.ReentrantLock
+import kotlin.NoSuchElementException
 import kotlin.collections.ArrayList
 
 class PacketWriteQueue : TickListener {
@@ -15,8 +16,8 @@ class PacketWriteQueue : TickListener {
 
     companion object {
         private val queueLock = ReentrantLock()
-        private val packetsToQueue = ArrayList<QueuedPacket<*>>(1000)
-        private val packetsToWrite = LinkedList<QueuedPacket<*>>()
+        private val packetsToQueue = ArrayList<QueuedPacket<*>?>(1000)
+        private val packetsToWrite = LinkedList<QueuedPacket<*>?>()
 
         @JvmStatic
         fun <T> handle(packet: OutgoingPacket<T>, context: T) {
@@ -39,25 +40,24 @@ class PacketWriteQueue : TickListener {
                 packetsToWrite.add(QueuedPacket(packet, context))
         }
 
-        @JvmStatic
-        fun pop(): QueuedPacket<*>? {
-            return try {
-                packetsToWrite.pop()
-            } catch (e: NoSuchElementException) {
-                null
-            }
-        }
-
         @JvmStatic
         fun flush() {
             queueLock.lock()
-            var packet: QueuedPacket<*>?
-            while (pop().also { packet = it } != null)
-                write(packet?.out ?: break, packet?.context ?: break)
+
+            var hasEnded = false
+            while (!hasEnded) {
+                try {
+                    val packet = packetsToWrite.pop()
+                    write(packet?.out ?: continue, packet.context ?: continue)
+                } catch (e: NoSuchElementException) {
+                    hasEnded = true
+                }
+            }
+
             if (packetsToWrite.isNotEmpty()) {
                 SystemLogger.logWarn("Packet queue was NOT empty! Remaining packets: ${packetsToWrite.size}")
                 try {
-                    for (pkt in packetsToWrite) SystemLogger.logWarn("${pkt.out.javaClass.simpleName} <- ${pkt.context}")
+                    for (pkt: QueuedPacket<*>? in packetsToWrite) SystemLogger.logWarn("${pkt?.out?.javaClass?.simpleName ?: "NULL"} <- ${pkt?.context ?: "NULL"}")
                 } catch (e: Exception)
                 {
                     e.printStackTrace()
@@ -65,12 +65,14 @@ class PacketWriteQueue : TickListener {
                     packetsToWrite.clear()
                 }
             }
+
+            queueLock.unlock()
+
             val queueIter = packetsToQueue.iterator()
             while (queueIter.hasNext()) {
                 packetsToWrite.add(queueIter.next())
                 queueIter.remove()
             }
-            queueLock.unlock()
         }
 
         @Suppress("UNCHECKED_CAST")