fix octree-server random spinout sometimes when client disconnects

assignment-client/src/octree/OctreeQueryNode.cpp

@@ -37,6 +37,18 @@ OctreeQueryNode::OctreeQueryNode() :
     _sequenceNumber = 0;
 }
 
+OctreeQueryNode::~OctreeQueryNode() {
+    if (_octreeSendThread) {
+        _octreeSendThread->terminate();
+        delete _octreeSendThread;
+    }
+
+    delete[] _octreePacket;
+    delete[] _lastOctreePacket;
+}
+
+
+
 void OctreeQueryNode::initializeOctreeSendThread(OctreeServer* octreeServer, const QUuid& nodeUUID) {
     // Create octree sending thread...
     _octreeSendThread = new OctreeSendThread(nodeUUID, octreeServer);
@@ -158,16 +170,6 @@ void OctreeQueryNode::writeToPacket(const unsigned char* buffer, int bytes) {
     }
 }
 
-OctreeQueryNode::~OctreeQueryNode() {
-    if (_octreeSendThread) {
-        _octreeSendThread->terminate();
-        delete _octreeSendThread;
-    }
-
-    delete[] _octreePacket;
-    delete[] _lastOctreePacket;
-}
-
 bool OctreeQueryNode::updateCurrentViewFrustum() {
     bool currentViewFrustumChanged = false;
     ViewFrustum newestViewFrustum;

assignment-client/src/octree/OctreeSendThread.cpp

@@ -20,7 +20,8 @@ quint64 endSceneSleepTime = 0;
 OctreeSendThread::OctreeSendThread(const QUuid& nodeUUID, OctreeServer* myServer) :
     _nodeUUID(nodeUUID),
     _myServer(myServer),
-    _packetData()
+    _packetData(),
+    _nodeMissingCount(0)
 {
     qDebug() << "client connected";
     _myServer->clientConnected();
@@ -33,6 +34,14 @@ OctreeSendThread::~OctreeSendThread() {
 
 
 bool OctreeSendThread::process() {
+
+    const int MAX_NODE_MISSING_CHECKS = 10;
+    if (_nodeMissingCount > MAX_NODE_MISSING_CHECKS) {
+        qDebug() << "our target node:" << _nodeUUID << "has been missing the last" << _nodeMissingCount 
+                        << "times we checked, we are going to stop attempting to send.";
+        return false; // stop processing and shutdown, our node no longer exists
+    }
+
     quint64  start = usecTimestampNow();
     bool gotLock = false;
 
@@ -41,6 +50,7 @@ bool OctreeSendThread::process() {
         SharedNodePointer node = NodeList::getInstance()->nodeWithUUID(_nodeUUID);
 
         if (node) {
+            _nodeMissingCount = 0;
             // make sure the node list doesn't kill our node while we're using it
             if (node->getMutex().tryLock()) {
                 gotLock = true;
@@ -61,6 +71,8 @@ bool OctreeSendThread::process() {
 
                 node->getMutex().unlock(); // we're done with this node for now.
             }
+        } else {
+            _nodeMissingCount++;
         }
     } else {
         if (_myServer->wantsDebugSending() && _myServer->wantsVerboseDebug()) {

assignment-client/src/octree/OctreeSendThread.h

@@ -16,6 +16,7 @@
 #include "OctreeQueryNode.h"
 #include "OctreeServer.h"
 
+
 /// Threaded processor for sending voxel packets to a single client
 class OctreeSendThread : public GenericThread {
 public:
@@ -41,6 +42,8 @@ private:
     int packetDistributor(const SharedNodePointer& node, OctreeQueryNode* nodeData, bool viewFrustumChanged);
 
     OctreePacketData _packetData;
+    
+    int _nodeMissingCount;
 };
 
 #endif // __octree_server__OctreeSendThread__