feat(chunkserver): add plugin reload mechanism (#821)

feat(chunkserver): add plugin reload mechanism

Introduce a plugin-wide reload mechanism to allow runtime reconfiguration
without requiring a chunkserver restart.

Signed-off-by: GigaCronos <jorge.cabrera@leil.io>

Author: GigaCronos

src/chunkserver/chunkserver-common/iplugin.h

@@ -38,6 +38,9 @@ class BOOST_SYMBOL_VISIBLE IPlugin {
 	/// needed.
 	virtual bool initialize() = 0;
 
+	/// Called on chunkserver reload to refresh plugin configuration parameters.
+	virtual void reload() = 0;
+
 	/// Returns the plugin name
 	virtual std::string name() = 0;
 	/// Returns the plugin version

src/chunkserver/chunkserver-common/plugin_manager.cc

@@ -118,6 +118,15 @@ bool PluginManager::checkVersion(IPlugin *plugin) {
 	return false;
 }
 
+void PluginManager::reloadPlugins() {
+	for (auto &[name, plugin] : diskPlugins_) {
+		if (plugin) {
+			safs::log_info("Reloading plugin {}", plugin->toString());
+			plugin->reload();
+		}
+	}
+}
+
 void PluginManager::cleanupPlugins() {
 	for (auto &[name, plugin] : diskPlugins_) {
 		if (plugin) {

src/chunkserver/chunkserver-common/plugin_manager.h

@@ -49,6 +49,9 @@ class PluginManager {
 	/// True if this plugin manager can handle the plugin based on the version.
 	bool checkVersion(IPlugin *plugin);
 
+	/// Reload plugins options for all the needed plugins.
+	void reloadPlugins();
+
 	/// Cleanup resources for all the needed plugins.
 	void cleanupPlugins();
 

src/chunkserver/hddspacemgr.cc

@@ -2845,6 +2845,9 @@ void hddReload(void) {
 	} catch (const Exception& ex) {
 		safs_pretty_syslog(LOG_ERR, "%s", ex.what());
 	}
+
+	// Request plugins to reload
+	pluginManager.reloadPlugins();
 }
 
 int hddLateInit() {