feat: allow developers to register external cpp plugins

core/collection_pipeline/plugin/PluginRegistry.cpp

@@ -68,6 +68,7 @@
 #ifdef __ENTERPRISE__
 #include "plugin/flusher/sls/EnterpriseFlusherSLSMonitor.h"
 #endif
+#include "provider/Provider.h"
 
 DEFINE_FLAG_BOOL(enable_processor_spl, "", true);
 DEFINE_FLAG_BOOL(enable_ebpf_network_observer, "", false);
@@ -83,6 +84,7 @@ void PluginRegistry::LoadPlugins() {
     LoadStaticPlugins();
     auto& plugins = AppConfig::GetInstance()->GetDynamicPlugins();
     LoadDynamicPlugins(plugins);
+    RegisterExternalPlugins(); // external plugin registration
 }
 
 void PluginRegistry::UnloadPlugins() {

core/collection_pipeline/plugin/PluginRegistry.h

@@ -56,6 +56,10 @@ class PluginRegistry {
     bool IsValidNativeFlusherPlugin(const std::string& name) const;
     bool IsGlobalSingletonInputPlugin(const std::string& name) const;
 
+    void RegisterInputCreator(PluginCreator* creator, bool isSingleton = false);
+    void RegisterProcessorCreator(PluginCreator* creator);
+    void RegisterFlusherCreator(PluginCreator* creator, bool isSingleton = false);
+
 private:
     enum PluginCat { INPUT_PLUGIN, PROCESSOR_PLUGIN, FLUSHER_PLUGIN };
 
@@ -79,9 +83,6 @@ class PluginRegistry {
 
     void LoadStaticPlugins();
     void LoadDynamicPlugins(const std::set<std::string>& plugins);
-    void RegisterInputCreator(PluginCreator* creator, bool isSingleton = false);
-    void RegisterProcessorCreator(PluginCreator* creator);
-    void RegisterFlusherCreator(PluginCreator* creator, bool isSingleton = false);
     PluginCreator* LoadProcessorPlugin(DynamicLibLoader& loader, const std::string pluginType);
     void RegisterCreator(PluginCat cat, PluginCreator* creator, bool isSingleton);
     std::unique_ptr<PluginInstance>

core/provider/Provider.cpp

@@ -38,4 +38,8 @@ ProfileSender* GetProfileSender() {
     return ProfileSender::GetInstance();
 }
 
+
+void RegisterExternalPlugins() {
+}
+
 } // namespace logtail

core/provider/Provider.h

@@ -33,5 +33,11 @@ std::vector<ConfigProvider*> GetRemoteConfigProviders();
 void InitRemoteConfigProviders();
 
 // GetProfileSender returns the ProfileSender instance.
+// Self-monitor metrics are not sent via ProfileSender anymore.
 ProfileSender* GetProfileSender();
+
+// RegisterExternalPlugins registers the external cpp plugins.
+// For example:
+//  PluginRegistry::GetInstance()->RegisterFlusherCreator(new StaticFlusherCreator<FlusherExternal>());
+void RegisterExternalPlugins();
 } // namespace logtail