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#include <Plugin/PluginManager.h>
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#include <Plugin/IPlugin.h>
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#include <QDir>
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#include <QLibrary>
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#include <QPluginLoader>
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Q_LOGGING_CATEGORY(LOG_PluginManager, "PluginManager")
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namespace {
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/// Key for retrieving metadata of the plugin
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const auto PLUGIN_METADATA_KEY = QStringLiteral("MetaData");
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/// Key for retrieving the name of the plugin in its metadata
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const auto PLUGIN_NAME_KEY = QStringLiteral("name");
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/// Helper to state the plugin loading operation
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struct LoadPluginState {
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explicit LoadPluginState(const QString &pluginPath)
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: m_PluginPath{pluginPath}, m_Valid{true}, m_ErrorMessage{}
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{
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}
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void log() const
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{
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if (m_Valid) {
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qCDebug(LOG_PluginManager())
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<< QObject::tr("File '%1' has been loaded as a plugin").arg(m_PluginPath);
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}
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else {
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qCWarning(LOG_PluginManager())
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<< QObject::tr("File '%1' can't be loaded as a plugin: %2")
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.arg(m_PluginPath)
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.arg(m_ErrorMessage);
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}
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}
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void setError(const QString &errorMessage)
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{
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m_Valid = false;
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m_ErrorMessage = errorMessage;
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}
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QString m_PluginPath;
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bool m_Valid;
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QString m_ErrorMessage;
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};
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} // namespace
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struct PluginManager::PluginManagerPrivate {
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/**
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* Loads a single plugin into SciQlop. The method has no effect if the plugin is malformed (e.g.
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* wrong library type, missing metadata, etc.)
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* @param pluginPath the path to the plugin library.
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*/
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void loadPlugin(const QString &pluginPath)
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{
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qCDebug(LOG_PluginManager())
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<< QObject::tr("Attempting to load file '%1' as a plugin").arg(pluginPath);
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LoadPluginState loadState{pluginPath};
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if (QLibrary::isLibrary(pluginPath)) {
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QPluginLoader pluginLoader{pluginPath};
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// Retrieving the plugin name to check if it can be loaded (i.e. no plugin with the same
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// name has been registered yet)
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auto metadata = pluginLoader.metaData().value(PLUGIN_METADATA_KEY).toObject();
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auto pluginName = metadata.value(PLUGIN_NAME_KEY).toString();
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if (pluginName.isEmpty()) {
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loadState.setError(QObject::tr("empty file name"));
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}
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else if (m_RegisteredPlugins.contains(pluginName)) {
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loadState.setError(QObject::tr("name '%1' already registered").arg(pluginName));
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}
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else {
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if (auto pluginInstance = qobject_cast<IPlugin *>(pluginLoader.instance())) {
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pluginInstance->initialize();
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m_RegisteredPlugins.insert(pluginName, pluginPath);
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}
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else {
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loadState.setError(QObject::tr("the file is not a Sciqlop plugin"));
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}
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}
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}
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else {
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loadState.setError(QObject::tr("the file is not a library"));
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}
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// Log loading result
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loadState.log();
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}
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/// Registered plugins (key: plugin name, value: plugin path)
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QHash<QString, QString> m_RegisteredPlugins;
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};
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PluginManager::PluginManager() : impl{spimpl::make_unique_impl<PluginManagerPrivate>()}
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{
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}
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void PluginManager::loadPlugins(const QDir &pluginDir)
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{
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// Load plugins
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auto pluginInfoList = pluginDir.entryInfoList(QDir::Files, QDir::Name);
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for (auto pluginInfo : qAsConst(pluginInfoList)) {
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impl->loadPlugin(pluginInfo.absoluteFilePath());
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}
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}
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int PluginManager::nbPluginsLoaded() const noexcept
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{
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return impl->m_RegisteredPlugins.size();
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}
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