Implement support for persisting modified attributes

fixes #9093

icinga-app/icinga.cpp

@@ -263,6 +263,7 @@ int Main(void)
 	}
 
 	Application::DeclareStatePath(Application::GetLocalStateDir() + "/lib/icinga2/icinga2.state");
+	Application::DeclareModAttrPath(Application::GetLocalStateDir() + "/lib/icinga2/modified-attributes.conf");
 	Application::DeclareObjectsPath(Application::GetLocalStateDir() + "/cache/icinga2/icinga2.debug");
 	Application::DeclareVarsPath(Application::GetLocalStateDir() + "/cache/icinga2/icinga2.vars");
 	Application::DeclarePidPath(Application::GetRunDir() + "/icinga2/icinga2.pid");

lib/base/application.cpp

@@ -600,6 +600,7 @@ void Application::DisplayInfoMessage(std::ostream& os, bool skipVersion)
 	   << "  Local state directory: " << GetLocalStateDir() << "\n"
 	   << "  Package data directory: " << GetPkgDataDir() << "\n"
 	   << "  State path: " << GetStatePath() << "\n"
+	   << "  Modified attributes path: " << GetModAttrPath() << "\n"
 	   << "  Objects path: " << GetObjectsPath() << "\n"
 	   << "  Vars path: " << GetVarsPath() << "\n"
 	   << "  PID path: " << GetPidPath() << "\n";
@@ -1281,6 +1282,27 @@ void Application::DeclareStatePath(const String& path)
 		ScriptGlobal::Set("StatePath", path);
 }
 
+/**
+ * Retrieves the path for the modified attributes file.
+ *
+ * @returns The path.
+ */
+String Application::GetModAttrPath(void)
+{
+	return ScriptGlobal::Get("ModAttrPath", &Empty);
+}
+
+/**
+ * Sets the path for the modified attributes file.
+ *
+ * @param path The new path.
+ */
+void Application::DeclareModAttrPath(const String& path)
+{
+	if (!ScriptGlobal::Exists("ModAttrPath"))
+		ScriptGlobal::Set("ModAttrPath", path);
+}
+
 /**
  * Retrieves the path for the objects file.
  *

lib/base/application.hpp

@@ -106,6 +106,9 @@ public:
 	static String GetStatePath(void);
 	static void DeclareStatePath(const String& path);
 
+	static String GetModAttrPath(void);
+	static void DeclareModAttrPath(const String& path);
+
 	static String GetObjectsPath(void);
 	static void DeclareObjectsPath(const String& path);
 

lib/base/dynamicobject.cpp

@@ -404,6 +404,27 @@ void DynamicObject::StopObjects(void)
 	}
 }
 
+void DynamicObject::DumpModifiedAttributes(const boost::function<void(const DynamicObject::Ptr&, const String&, const Value&)>& callback)
+{
+	BOOST_FOREACH(const DynamicType::Ptr& dt, DynamicType::GetTypes()) {
+		BOOST_FOREACH(const DynamicObject::Ptr& object, dt->GetObjects()) {
+			Dictionary::Ptr originalAttributes = object->GetOriginalAttributes();
+
+			if (!originalAttributes)
+				continue;
+
+			ObjectLock olock(originalAttributes);
+			BOOST_FOREACH(const Dictionary::Pair& kv, originalAttributes) {
+				// TODO-MA: vars.os
+				int fid = object->GetReflectionType()->GetFieldId(kv.first);
+				Value value = object->GetField(fid);
+				callback(object, kv.first, value);
+			}
+		}
+	}
+
+}
+
 DynamicObject::Ptr DynamicObject::GetObject(const String& type, const String& name)
 {
 	DynamicType::Ptr dtype = DynamicType::GetByName(type);

lib/base/dynamicobject.hpp

@@ -86,6 +86,8 @@ public:
 	static void RestoreObjects(const String& filename, int attributeTypes = FAState);
 	static void StopObjects(void);
 
+	static void DumpModifiedAttributes(const boost::function<void(const DynamicObject::Ptr&, const String&, const Value&)>& callback);
+
 	static Object::Ptr GetPrototype(void);
 
 protected:

lib/icinga/icingaapplication.cpp

@@ -20,6 +20,7 @@
 #include "icinga/icingaapplication.hpp"
 #include "icinga/icingaapplication.tcpp"
 #include "icinga/cib.hpp"
+#include "config/configwriter.cpp"
 #include "base/dynamictype.hpp"
 #include "base/logger.hpp"
 #include "base/objectlock.hpp"
@@ -102,6 +103,18 @@ int IcingaApplication::Main(void)
 	l_RetentionTimer->OnTimerExpired.connect(boost::bind(&IcingaApplication::DumpProgramState, this));
 	l_RetentionTimer->Start();
 
+	/* restore modified attributes */
+	Expression *expression = ConfigCompiler::CompileFile(GetModAttrPath());
+
+	if (expression) {
+		try {
+			ScriptFrame frame;
+			expression->Evaluate(frame);
+		} catch (const std::exception& ex) {
+			Log(LogCritical, "config", DiagnosticInformation(ex));
+		}
+	}
+
 	RunEventLoop();
 
 	Log(LogInformation, "IcingaApplication", "Icinga has shut down.");
@@ -121,9 +134,43 @@ void IcingaApplication::OnShutdown(void)
 	DumpProgramState();
 }
 
+static void PersistModAttrHelper(const ConfigWriter::Ptr& cw, DynamicObject::Ptr& previousObject, const DynamicObject::Ptr& object, const String& attr, const Value& value)
+{
+	if (object != previousObject) {
+		if (previousObject)
+			cw->EmitRaw("}\n\n");
+
+		cw->EmitRaw("var obj = get_object(");
+		cw->EmitIdentifier(object->GetReflectionType()->GetName(), 0);
+		cw->EmitRaw(", ");
+		cw->EmitString(object->GetName());
+		cw->EmitRaw(")\n");
+
+		cw->EmitRaw("if (obj) {\n");
+	}
+
+	cw->EmitRaw("\tobj.");
+
+	Array::Ptr args2 = new Array();
+	args2->Add(attr);
+	args2->Add(value);
+	cw->EmitFunctionCall("modify_attribute", args2);
+
+	cw->EmitRaw("\n");
+
+	previousObject = object;
+}
+
 void IcingaApplication::DumpProgramState(void)
 {
 	DynamicObject::DumpObjects(GetStatePath());
+
+	ConfigWriter::Ptr cw = new ConfigWriter(GetModAttrPath());
+	DynamicObject::Ptr previousObject;
+	DynamicObject::DumpModifiedAttributes(boost::bind(&PersistModAttrHelper, cw, boost::ref(previousObject), _1, _2, _3));
+
+	if (previousObject)
+		cw->EmitRaw("\n}\n");
 }
 
 IcingaApplication::Ptr IcingaApplication::GetInstance(void)