recursive bucket scan - we're crashing when passing a slice to go code

main.go

@@ -160,38 +160,29 @@ func Bolt_ListBuckets(b ObjectReference, browse []string) ObjectReference {
 	pNC_Ref := gms.Put(pNC)
 
 	go func() {
-		err := withBoltDBReference(b, func(db *bolt.DB) error {
-			return db.View(func(tx *bolt.Tx) error {
+		var err error
 
 		if len(browse) == 0 {
-					// Root-mode
+			// root mode
+			err = withBoltDBReference(b, func(db *bolt.DB) error {
+				return db.View(func(tx *bolt.Tx) error {
 					return tx.ForEach(func(k []byte, _ *bolt.Bucket) error {
 						pNC.content <- CallResponse{s: string(k)}
 						return nil
 					})
+				})
+			})
 
 		} else {
 			// Nested-mode
-					bucket := tx.Bucket([]byte(browse[0]))
-					if bucket == nil {
-						return errors.New("Unknown bucket")
-					}
-
-					for i := 1; i < len(browse); i += 1 {
-						bucket = bucket.Bucket([]byte(browse[i]))
-						if bucket == nil {
-							return errors.New("Unknown bucket")
-						}
-					}
-
+			err = withBrowse_ReadOnly(b, browse, func(db *bolt.DB, tx *bolt.Tx, bucket *bolt.Bucket) error {
 				return bucket.ForEach(func(k, v []byte) error {
 					pNC.content <- CallResponse{s: string(k)}
 					return nil
 				})
+			})
 
 		}
-			})
-		})
 
 		if err != nil {
 			pNC.content <- CallResponse{e: err}

qbolt/boltdb.cpp

@@ -32,11 +32,26 @@ static const int REAL_MESSAGE           = 103;
 bool BoltDB::listBucketsAtRoot(QString& errorOut, NameReciever cb)
 {
     auto listJob = ::Bolt_ListBucketsAtRoot(this->gmsDbRef);
+    return pumpNext(listJob, errorOut, cb);
+}
 
+bool BoltDB::listBuckets(QStringList bucketPath, QString& errorOut, NameReciever cb)
+{
+    if (bucketPath.size() == 0) {
+        return listBucketsAtRoot(errorOut, cb);
+    }
+
+    GoSliceManagedWrapper browse(&bucketPath);
+    auto listJob = ::Bolt_ListBuckets(this->gmsDbRef, browse.slice);
+    return pumpNext(listJob, errorOut, cb);
+}
+
+bool BoltDB::pumpNext(GoInt64 jobRef, QString& errorOut, NameReciever cb)
+{
     errorOut.clear();
 
     for(;;) {
-        auto gnr = ::GetNext(listJob);
+        auto gnr = ::GetNext(jobRef);
 
         if (gnr.r0 == ERROR_AND_STOP_CALLING) {
             errorOut.append(QString::fromUtf8(gnr.r1, gnr.r2)); // log error

qbolt/boltdb.h

@@ -18,11 +18,17 @@ public:
 
     bool listBucketsAtRoot(QString& errorOut, NameReciever cb);
 
+    bool listBuckets(QStringList bucketPath, QString& errorOut, NameReciever cb);
+
     bool getStatsJSON(std::function<void(QString)> onSuccess, std::function<void(QString)> onError);
 
     bool getBucketStatsJSON(QStringList bucketPath, std::function<void(QString)> onSuccess, std::function<void(QString)> onError);
 
     ~BoltDB();
+
+protected:
+
+    bool pumpNext(GoInt64 jobRef, QString& errorOut, NameReciever cb);
 };
 
 #endif // BOLTDB_H

qbolt/interop.cpp

@@ -22,12 +22,14 @@ GoSliceManagedWrapper::GoSliceManagedWrapper(QStringList *qsl) :
     strings(),
     slice()
 {
+    rawStrings.reserve(qsl->size());
+    strings.reserve(qsl->size());
     for (int i = 0; i < qsl->size(); ++i) {
         rawStrings.push_back( qsl->at(i).toUtf8() );
         strings.push_back(GoString{ rawStrings[i].data(), rawStrings[i].size() });
     }
 
-    slice.data = static_cast<void*>( & strings.first() );
+    slice.data = static_cast<void*>( & strings[0] );
     slice.len  = strings.size(); //  * sizeof(GoString);
     slice.cap  = slice.len;
 }

qbolt/mainwindow.cpp

@@ -65,26 +65,43 @@ void MainWindow::on_actionOpen_database_triggered()
     ui->bucketTree->addTopLevelItem(top);
 
     refreshBucketTree(top);
+    ui->bucketTree->setCurrentItem(top);
 }
 
-void MainWindow::refreshBucketTree(QTreeWidgetItem* top)
+void MainWindow::refreshBucketTree(QTreeWidgetItem* itm)
 {
-    ui->bucketTree->clearSelection();
-    //top->setSelected(true);
-    ui->bucketTree->setCurrentItem(top);
+    // ui->bucketTree->clearSelection();
+    QTreeWidgetItem *top = itm;
+    QStringList browsePath;
+    while(top->parent() != nullptr) {
+        browsePath.push_front(top->text(0));
+        top = top->parent();
+    }
+
+    // Remove existing children
+    for (int i = itm->childCount(); i --> 0;) {
+        delete itm->takeChild(i);
+    }
+
+    if (browsePath.size() > 1) {
+        return; // only go one level deep
+    }
 
     auto *bdb = GET_BDB(top);
-    for (int i = top->childCount(); i --> 0;) {
-        delete top->takeChild(i);
-    }
 
     QString error;
-    bool ok = bdb->listBucketsAtRoot(error, [=](QByteArray qba){
+    bool ok = bdb->listBuckets(
+        browsePath,
+        error,
+        [=](QByteArray qba){
             QTreeWidgetItem *child = new QTreeWidgetItem();
             child->setText(0, QString::fromUtf8(qba));
             child->setIcon(0, QIcon(":/rsrc/table.png"));
-        top->addChild(child);
-    });
+            itm->addChild(child);
+
+            refreshBucketTree(child);
+        }
+    );
 
     if (!ok) {
         QMessageBox qmb;