Fix Region-change Crash

Author: 3vi1

docs/RELEASES

@@ -1,3 +1,6 @@
+0.8.8 - Fixes crashes when changing regions due to access of invalidated
+        logInfo pointers.
+
 0.8.7 - Fixed avatars not showing for some users on Windows due to missing
         DLLs.
 

src/imp.pro

@@ -12,7 +12,7 @@ greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 TARGET = imp
 TEMPLATE = app
 
-VERSION = 0.8.7
+VERSION = 0.8.8
 QMAKE_TARGET_COMPANY = EternalDusk
 QMAKE_TARGET_DESCRIPTION = Eve Online Intelligence Management Program
 QMAKE_TARGET_COPYRIGHT = (c) Copyright 2016-2017 Jesse Litton

src/mainwindow.cpp

@@ -344,14 +344,7 @@ void MainWindow::loadMap()
         regionMap = NULL;
     }
     regionMap = new Map(this);
-
     ui->mapView->setMap(regionMap);
-    connect(regionMap, &Map::lineAdded,
-            ui->mapView, &SvgMapView::gotLine);
-    connect(regionMap, &Map::systemAdded,
-            ui->mapView, &SvgMapView::gotSystem);
-    connect(regionMap, &Map::systemPosition,
-            ui->mapView, &SvgMapView::gotSystemPosition);
 
     QNetworkRequest request(QUrl(options.getMapPath() +
                                  options.getRegion() + ".svg"));
@@ -648,7 +641,7 @@ void MainWindow::initParsing()
     {
         parser->deleteLater();
     }
-    parser = new Parser(this);
+    parser = new Parser(++parserGeneration, this);
     parser->setMap(*regionMap);
 
     if(lc != NULL)
@@ -1009,6 +1002,11 @@ void MainWindow::fileChanged(const QString &absoluteFilePath)
 
     foreach (MessageInfo message, messages)
     {
+        // If they switch regions while parsing messages,
+        // discard the ones on the queue.
+        if(message.parserGeneration != parserGeneration)
+            break;
+
         if(!mapLoading)
             doUserActions(message);
 

src/mainwindow.h

@@ -170,6 +170,7 @@ private slots:
 
     LogCatcher*             lc = NULL;
     Parser*                 parser = NULL;
+    uint                    parserGeneration = 0;
 
     QNetworkAccessManager   manager;
     QNetworkReply*          reply;

src/map.cpp

@@ -36,14 +36,6 @@ Map::Map(QObject *parent) : QObject(parent)
 void Map::setRefresh(int msecs)
 {
     m_timer->setInterval(msecs);
-    /*
-    if(m_timer != NULL)
-    {
-        m_timer->deleteLater();
-    }
-    m_timer = new QTimer(this);
-    connect(m_timer, SIGNAL(timeout()), this, SLOT(updateActiveSystems()));
-*/
 }
 
 void Map::startUpdates()

src/mapshape.cpp

@@ -27,31 +27,26 @@
 #include <QStandardPaths>
 #include <QSvgRenderer>
 
-MapShape::MapShape()
+MapShape::MapShape(QGraphicsItem *parentItem) : QGraphicsSvgItem(parentItem)
 {
-    renderer = new QSvgRenderer();
-    connect(renderer, &QSvgRenderer::repaintNeeded,
-            this, &MapShape::repainter );
 }
 
 MapShape::MapShape(QSvgRenderer* svgRenderer,
-            const QString& name,
-            const QString& itemId)
+                   QString name,
+                   QString itemId,
+                   QGraphicsItem* parentItem) : QGraphicsSvgItem(parentItem)
 {
-    renderer = svgRenderer;
+    this->setSharedRenderer(svgRenderer);
+
     shapeName = name;
-    setSharedRenderer(renderer);
     setElementId(itemId);
-    connect(renderer, &QSvgRenderer::repaintNeeded,
-            this, &MapShape::repainter);
+
+    /*connect(renderer, &QSvgRenderer::repaintNeeded,
+            this, &MapShape::repainter);*/
 }
 
 MapShape::~MapShape()
 {
-    if(renderer != NULL)
-    {
-        renderer->deleteLater();
-    }
 }
 
 void MapShape::repainter()
@@ -103,8 +98,7 @@ void MapShape::load(const QString& fileName)
 
 void MapShape::rebuildSvg()
 {
-    renderer->load(domDoc.toByteArray());
-    setSharedRenderer(renderer);
+    renderer()->load(domDoc.toByteArray());
     setElementId("");
 
     setFlags(QGraphicsItem::ItemClipsToShape);

src/mapshape.h

@@ -32,11 +32,11 @@
 class MapShape : public QGraphicsSvgItem
 {
 public:
-    explicit MapShape();
+    explicit MapShape(QGraphicsItem *parentItem = nullptr);
     MapShape(QSvgRenderer* svgRenderer,
-             const QString& name,
-             const QString& itemId);//,
-             //QGraphicsView *view);
+             QString name,
+             QString itemId,
+             QGraphicsItem *parentItem = nullptr);
     ~MapShape();
 
     void paint(QPainter * painter,
@@ -67,7 +67,6 @@ public slots:
     void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
 
     QString shapeName;
-    QSvgRenderer* renderer;
 
 private:
     bool rotationLocked;

src/meta.h

@@ -27,8 +27,8 @@ static const struct Version
 {
     Version(){}
 
-    QString release = "0.8.7"; //VERSION;
-    QString name = "Lupine Fresh Scent";
+    QString release = "0.8.8"; //VERSION;
+    QString name = "Lycrash vs. Silver Pointers";
 
     QString styleHeader1 = "<span style=\" color:#0000ff;\">";
     QString styleFooter1 = "</span>";

src/parser.cpp

@@ -32,8 +32,10 @@
 
 using namespace std;
 
-Parser::Parser(QObject *parent) : QObject(parent)
+Parser::Parser(uint generation, QObject *parent) : QObject(parent)
 {
+    this->generation = generation;
+
     ignoreChars = "[\\\\_=!@#$%^&\\*,\\.\\[\\]\\(\\)\\{\\}\\?]";   // "\\_=!@#$%^&*,./[](){}?"
 
     // Load words, channels, and ships from files
@@ -101,6 +103,7 @@ QList<MessageInfo> Parser::fileChanged(const QString& path, int maxEntries, bool
             if (sysIdRegExp.indexIn(line) != -1 && localChannels.contains(channel))
             {
                 MessageInfo systemChange;
+                systemChange.parserGeneration = generation;
                 systemChange.flags.append(MessageFlag::SYSTEM_CHANGE);
                 systemChange.systems.append(regionMap->getSystemById(sysIdRegExp.cap(1)));
                 systemChange.text = "System changed to " + systemChange.systems[0];
@@ -134,6 +137,7 @@ QList<MessageInfo> Parser::fileChanged(const QString& path, int maxEntries, bool
 
         MessageInfo newMessage = parseLine(lines[i].trimmed().remove(0xfeff));
 
+        newMessage.parserGeneration = generation;
         newMessage.logInfo = &fileMap[path];
         if(newMessage.systems.length() > 0)
         {

src/parser.h

@@ -50,8 +50,9 @@ struct LogInfo
 
 struct MessageInfo
 {
+    uint    parserGeneration = 0;
     QString originalLine;
-    bool indecipherable = false;
+    bool    indecipherable = false;
 
     LogInfo* logInfo;
 
@@ -73,7 +74,7 @@ class Parser : public QObject
 {
     Q_OBJECT
 public:
-    explicit Parser(QObject *parent = 0);
+    explicit Parser(uint generation, QObject *parent = 0);
     void setMap(Map& map);
     QList<MessageInfo> fileChanged(const QString& path, int maxEntries = 0, bool initialLoad = false);
     QSet<QString> getLocalChannels();
@@ -87,6 +88,8 @@ class Parser : public QObject
 public slots:
 
 private:
+    uint    generation = 0;
+
     QString lastListener;
     QString lastLocalSystem;