New GlobalStoragePythonWrapper is passed to the Python API.

This allows us to make GlobalStorage a QObject, with disabled copy
constructor. And thanks to this change, GlobalStorage now emits
changed() every time an insert or remove is performed.

src/libcalamares/GlobalStorage.cpp

@@ -1,6 +1,6 @@
 /* === This file is part of Calamares - <http://github.com/calamares> ===
  *
- *   Copyright 2014, Teo Mrnjavac <teo@kde.org>
+ *   Copyright 2014-2015, Teo Mrnjavac <teo@kde.org>
  *
  *   Calamares is free software: you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -31,6 +31,7 @@ namespace bp = boost::python;
 namespace Calamares {
 
 GlobalStorage::GlobalStorage()
+    : QObject( nullptr )
 {
 }
 
@@ -53,6 +54,7 @@ void
 GlobalStorage::insert( const QString& key, const QVariant& value )
 {
     m.insert( key, value );
+    emit changed();
 }
 
 
@@ -67,6 +69,7 @@ int
 GlobalStorage::remove( const QString& key )
 {
     return m.remove( key );
+    emit changed();
 }
 
 
@@ -76,47 +79,63 @@ GlobalStorage::value( const QString& key ) const
     return m.value( key );
 }
 
+} // namespace Calamares
+
 #ifdef WITH_PYTHON
 
-bool
-GlobalStorage::python_contains( const std::string& key ) const
+namespace CalamaresPython
 {
-    return contains( QString::fromStdString( key ) );
+
+GlobalStoragePythonWrapper::GlobalStoragePythonWrapper( Calamares::GlobalStorage* gs )
+    : m_gs( gs )
+{}
+
+bool
+GlobalStoragePythonWrapper::contains( const std::string& key ) const
+{
+    return m_gs->contains( QString::fromStdString( key ) );
+}
+
+
+int
+GlobalStoragePythonWrapper::count() const
+{
+    return m_gs->count();
 }
 
 
 void
-GlobalStorage::python_insert( const std::string& key,
+GlobalStoragePythonWrapper::insert( const std::string& key,
                        const bp::object& value )
 {
-    insert( QString::fromStdString( key ),
-            CalamaresPython::variantFromPyObject( value ) );
+    m_gs->insert( QString::fromStdString( key ),
+                CalamaresPython::variantFromPyObject( value ) );
 }
 
 
 bp::list
-GlobalStorage::python_keys() const
+GlobalStoragePythonWrapper::keys() const
 {
     bp::list pyList;
-    foreach( const QString& key, keys() )
+    foreach( const QString& key, m_gs->keys() )
         pyList.append( key.toStdString() );
     return pyList;
 }
 
 
 int
-GlobalStorage::python_remove( const std::string& key )
+GlobalStoragePythonWrapper::remove( const std::string& key )
 {
-    return remove( QString::fromStdString( key ) );
+    return m_gs->remove( QString::fromStdString( key ) );
 }
 
 
 bp::object
-GlobalStorage::python_value( const std::string& key ) const
+GlobalStoragePythonWrapper::value( const std::string& key ) const
 {
-    return CalamaresPython::variantToPyObject( value( QString::fromStdString( key ) ) );
+    return CalamaresPython::variantToPyObject( m_gs->value( QString::fromStdString( key ) ) );
 }
 
-#endif // WITH_PYTHON
+} // namespace CalamaresPython
 
-} // namespace Calamares
+#endif // WITH_PYTHON

src/libcalamares/GlobalStorage.h

@@ -42,8 +42,9 @@ namespace Calamares
 
 class DebugWindow;
 
-class GlobalStorage
+class GlobalStorage : public QObject
 {
+    Q_OBJECT
 public:
     explicit GlobalStorage();
 
@@ -56,13 +57,8 @@ public:
     int remove( const QString& key );
     QVariant value( const QString& key ) const;
 
-#ifdef WITH_PYTHON
-    bool python_contains( const std::string& key ) const;
-    void python_insert( const std::string& key, const boost::python::api::object& value );
-    boost::python::list python_keys() const;
-    int python_remove( const std::string& key );
-    boost::python::api::object python_value( const std::string& key ) const;
-#endif
+signals:
+    void changed();
 
 private:
     QVariantMap m;
@@ -72,4 +68,26 @@ private:
 
 } // namespace Calamares
 
+#ifdef WITH_PYTHON
+namespace CalamaresPython
+{
+
+class GlobalStoragePythonWrapper
+{
+public:
+    explicit GlobalStoragePythonWrapper( Calamares::GlobalStorage* gs );
+
+    bool contains( const std::string& key ) const;
+    int count() const;
+    void insert( const std::string& key, const boost::python::api::object& value );
+    boost::python::list keys() const;
+    int remove( const std::string& key );
+    boost::python::api::object value( const std::string& key ) const;
+private:
+    Calamares::GlobalStorage* m_gs;
+};
+
+} // namespace CalamaresPython
+#endif
+
 #endif // CALAMARES_GLOBALSTORAGE_H

src/libcalamares/PythonJob.cpp

@@ -1,6 +1,6 @@
 /* === This file is part of Calamares - <http://github.com/calamares> ===
  *
- *   Copyright 2014, Teo Mrnjavac <teo@kde.org>
+ *   Copyright 2014-2015, Teo Mrnjavac <teo@kde.org>
  *
  *   Calamares is free software: you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -79,13 +79,13 @@ BOOST_PYTHON_MODULE( libcalamares )
             "as a real number between 0 and 1."
         );
 
-    bp::class_< Calamares::GlobalStorage >( "GlobalStorage", bp::init<>() )
-        .def( "contains",   &Calamares::GlobalStorage::python_contains )
-        .def( "count",      &Calamares::GlobalStorage::count )
-        .def( "insert",     &Calamares::GlobalStorage::python_insert )
-        .def( "keys",       &Calamares::GlobalStorage::python_keys )
-        .def( "remove",     &Calamares::GlobalStorage::python_remove )
-        .def( "value",      &Calamares::GlobalStorage::python_value );
+    bp::class_< CalamaresPython::GlobalStoragePythonWrapper >( "GlobalStorage", bp::init< Calamares::GlobalStorage* >() )
+        .def( "contains",   &CalamaresPython::GlobalStoragePythonWrapper::contains )
+        .def( "count",      &CalamaresPython::GlobalStoragePythonWrapper::count )
+        .def( "insert",     &CalamaresPython::GlobalStoragePythonWrapper::insert )
+        .def( "keys",       &CalamaresPython::GlobalStoragePythonWrapper::keys )
+        .def( "remove",     &CalamaresPython::GlobalStoragePythonWrapper::remove )
+        .def( "value",      &CalamaresPython::GlobalStoragePythonWrapper::value );
 
     // libcalamares.utils submodule starts here
     bp::object utilsModule( bp::handle<>( bp::borrowed( PyImport_AddModule( "libcalamares.utils" ) ) ) );
@@ -271,7 +271,8 @@ PythonJob::exec()
         bp::dict calamaresNamespace = bp::extract< bp::dict >( calamaresModule.attr( "__dict__" ) );
 
         calamaresNamespace[ "job" ] = CalamaresPython::PythonJobInterface( this );
-        calamaresNamespace[ "globalstorage" ] = bp::ptr( JobQueue::instance()->globalStorage() );
+        calamaresNamespace[ "globalstorage" ] = CalamaresPython::GlobalStoragePythonWrapper(
+                                                JobQueue::instance()->globalStorage() );
 
         bp::object execResult = bp::exec_file( scriptFI.absoluteFilePath().toLocal8Bit().data(),
                                            scriptNamespace,