add GetMagic() check, move c/go interop into separate classes

MemoryStore.go

@@ -49,4 +49,8 @@ func (this *GoMemoryStore) Delete(i ObjectReference) {
 	delete(this.items, int64(i))
 }
 
-var gms = NewGoMemoryStore()
+var gms *GoMemoryStore = nil
+
+func init() {
+	gms = NewGoMemoryStore()
+}

main.go

@@ -8,6 +8,11 @@ import (
 	"github.com/boltdb/bolt"
 )
 
+//export GetMagic
+func GetMagic() int64 {
+	return 0x10203040
+}
+
 //export Bolt_Options_New
 func Bolt_Options_New() ObjectReference {
 	b := *bolt.DefaultOptions

qbolt.h

@@ -52,6 +52,8 @@ extern "C" {
 #endif
 
 
+extern GoInt64 GetMagic();
+
 extern GoInt64 Bolt_Options_New();
 
 extern GoInt64 Bolt_Options_New_Readonly();

qbolt/boltdb.cpp

@@ -0,0 +1,33 @@
+#include "boltdb.h"
+
+BoltDB::BoltDB()
+{
+
+}
+
+BoltDB* BoltDB::createFrom(QString filePath, QString &errorOut)
+{
+    auto opts = Bolt_Options_New_Readonly();
+
+    QByteArray filePathBytes(filePath.toUtf8());
+    GoString filePathGS = Interop::toGoString_WeakRef(&filePathBytes);
+
+    auto open_ret = Bolt_Open(filePathGS, 0444, opts);
+    if (open_ret.r1.v != nullptr) {
+        errorOut = Interop::GetError(open_ret.r1);
+        return nullptr;
+    }
+
+    BoltDB *ret = new BoltDB();
+    ret->gmsDbRef = open_ret.r0;
+    return ret;
+}
+
+BoltDB::~BoltDB()
+{
+    auto err = Bolt_Close(this->gmsDbRef);
+    if (err.v != nullptr) {
+        // Error closing database:
+        // errorOut = Interop::GetError(err);
+    }
+}

qbolt/boltdb.h

@@ -0,0 +1,19 @@
+#ifndef BOLTDB_H
+#define BOLTDB_H
+
+#include "interop.h"
+
+class BoltDB
+{
+protected:
+    BoltDB();
+
+    GoInt64 gmsDbRef;
+
+public:
+    static BoltDB* createFrom(QString filePath, QString &errorOut);
+
+    ~BoltDB();
+};
+
+#endif // BOLTDB_H

qbolt/interop.cpp

@@ -0,0 +1,23 @@
+#include "interop.h"
+
+Interop::Interop()
+{
+
+}
+
+QString Interop::GetError(GoInterface err) {
+    if (err.v == nullptr) {
+        return ""; // no error
+    }
+
+    GoString gs = Error_Error(err);
+    return QString::fromUtf8(gs.p, gs.n);
+}
+
+GoString Interop::toGoString_WeakRef(QByteArray *qba) {
+    return GoString{qba->data(), qba->length()};
+}
+
+int64_t Interop::GetMagic() {
+    return ::GetMagic();
+}

qbolt/interop.h

@@ -0,0 +1,19 @@
+#ifndef INTEROP_H
+#define INTEROP_H
+
+#include "../qbolt.h"
+#include <QString>
+
+class Interop
+{
+public:
+    Interop();
+
+    static QString GetError(GoInterface err);
+
+    static GoString toGoString_WeakRef(QByteArray *qba);
+
+    static int64_t GetMagic();
+};
+
+#endif // INTEROP_H

qbolt/main.cpp

@@ -1,8 +1,17 @@
 #include "mainwindow.h"
 #include <QApplication>
+#include "interop.h"
+
+#include <QDebug>
 
 int main(int argc, char *argv[])
 {
+    int64_t magic = Interop::GetMagic();
+    if (magic != 0x10203040) {
+        qDebug() << "bad magic " << magic;
+        return 1;
+    }
+
     QApplication a(argc, argv);
     MainWindow w;
     w.show();

qbolt/mainwindow.cpp

@@ -1,7 +1,7 @@
 #include "mainwindow.h"
 #include "ui_mainwindow.h"
 
-#include "../qbolt.h"
+#include "boltdb.h"
 
 #include <QFileDialog>
 #include <QMessageBox>
@@ -18,14 +18,6 @@ MainWindow::~MainWindow()
     delete ui;
 }
 
-static QString GetError(GoInterface err) {
-    if (err.v == nullptr) {
-        return ""; // no error
-    }
-
-    GoString gs = Error_Error(err);
-    return QString::fromUtf8(gs.p, gs.n);
-}
 
 void MainWindow::on_actionOpen_database_triggered()
 {
@@ -34,28 +26,16 @@ void MainWindow::on_actionOpen_database_triggered()
         return;
     }
 
-    auto opts = Bolt_Options_New_Readonly();
-
-    QByteArray filePathBytes(file.toUtf8());
-    GoString filePathGS = {filePathBytes.data(), filePathBytes.length()};
-
-    auto open_ret = Bolt_Open(filePathGS, 0444, opts);
-    if (open_ret.r1.v != nullptr) {
+    // Open
+    QString error;
+    auto *bdb = BoltDB::createFrom(file, error);
+    if (bdb == nullptr) {
         QMessageBox qmb;
-        qmb.setText(tr("Error opening database: %s").arg(GetError(open_ret.r1)));
+        qmb.setText(tr("Error opening database: %s").arg(error));
         qmb.exec();
         return;
     }
 
-    // do something
-
-    // close database
-
-    auto err = Bolt_Close(open_ret.r0);
-    if (err.v != nullptr) {
-        QMessageBox qmb;
-        qmb.setText(tr("Error closing database: %s").arg(GetError(err)));
-        qmb.exec();
-        return;
-    }
+    // Free
+    delete bdb;
 }

qbolt/qbolt.pro

@@ -27,9 +27,14 @@ QMAKE_LIBS += ../qbolt.a
 
 
 SOURCES += main.cpp\
-        mainwindow.cpp
+        mainwindow.cpp \
+    interop.cpp \
+    boltdb.cpp
 
-HEADERS  += mainwindow.h
+HEADERS  += mainwindow.h \
+    interop.h \
+    boltdb.h \
+    ../qbolt.h
 
 FORMS    += mainwindow.ui