Implement HA functionality for Elasticsearch feature

lib/perfdata/elasticsearchwriter.cpp

@@ -49,6 +49,15 @@ void ElasticsearchWriter::OnConfigLoaded()
 	ObjectImpl<ElasticsearchWriter>::OnConfigLoaded();
 
 	m_WorkQueue.SetName("ElasticsearchWriter, " + GetName());
+
+	if (!GetEnableHa()) {
+		Log(LogDebug, "ElasticsearchWriter")
+			<< "HA functionality disabled. Won't pause connection: " << GetName();
+
+		SetHAMode(HARunEverywhere);
+	} else {
+		SetHAMode(HARunOnce);
+	}
 }
 
 void ElasticsearchWriter::StatsFunc(const Dictionary::Ptr& status, const Array::Ptr& perfdata)
@@ -71,14 +80,14 @@ void ElasticsearchWriter::StatsFunc(const Dictionary::Ptr& status, const Array::
 	status->Set("elasticsearchwriter", new Dictionary(std::move(nodes)));
 }
 
-void ElasticsearchWriter::Start(bool runtimeCreated)
+void ElasticsearchWriter::Resume()
 {
-	ObjectImpl<ElasticsearchWriter>::Start(runtimeCreated);
+	ObjectImpl<ElasticsearchWriter>::Resume();
 
 	m_EventPrefix = "icinga2.event.";
 
 	Log(LogInformation, "ElasticsearchWriter")
-		<< "'" << GetName() << "' started.";
+		<< "'" << GetName() << "' resumed.";
 
 	m_WorkQueue.SetExceptionCallback(std::bind(&ElasticsearchWriter::ExceptionHandler, this, _1));
 
@@ -95,14 +104,14 @@ void ElasticsearchWriter::Start(bool runtimeCreated)
 	Checkable::OnNotificationSentToAllUsers.connect(std::bind(&ElasticsearchWriter::NotificationSentToAllUsersHandler, this, _1, _2, _3, _4, _5, _6, _7));
 }
 
-void ElasticsearchWriter::Stop(bool runtimeRemoved)
+void ElasticsearchWriter::Pause()
 {
 	Log(LogInformation, "ElasticsearchWriter")
-		<< "'" << GetName() << "' stopped.";
+		<< "'" << GetName() << "' paused.";
 
 	m_WorkQueue.Join();
 
-	ObjectImpl<ElasticsearchWriter>::Stop(runtimeRemoved);
+	ObjectImpl<ElasticsearchWriter>::Pause();
 }
 
 void ElasticsearchWriter::AddCheckResult(const Dictionary::Ptr& fields, const Checkable::Ptr& checkable, const CheckResult::Ptr& cr)
@@ -176,6 +185,9 @@ void ElasticsearchWriter::AddCheckResult(const Dictionary::Ptr& fields, const Ch
 
 void ElasticsearchWriter::CheckResultHandler(const Checkable::Ptr& checkable, const CheckResult::Ptr& cr)
 {
+	if (IsPaused())
+		return;
+
 	m_WorkQueue.Enqueue(std::bind(&ElasticsearchWriter::InternalCheckResultHandler, this, checkable, cr));
 }
 
@@ -230,6 +242,9 @@ void ElasticsearchWriter::InternalCheckResultHandler(const Checkable::Ptr& check
 
 void ElasticsearchWriter::StateChangeHandler(const Checkable::Ptr& checkable, const CheckResult::Ptr& cr, StateType type)
 {
+	if (IsPaused())
+		return;
+
 	m_WorkQueue.Enqueue(std::bind(&ElasticsearchWriter::StateChangeHandlerInternal, this, checkable, cr, type));
 }
 
@@ -279,6 +294,9 @@ void ElasticsearchWriter::NotificationSentToAllUsersHandler(const Notification::
 	const Checkable::Ptr& checkable, const std::set<User::Ptr>& users, NotificationType type,
 	const CheckResult::Ptr& cr, const String& author, const String& text)
 {
+	if (IsPaused())
+		return;
+
 	m_WorkQueue.Enqueue(std::bind(&ElasticsearchWriter::NotificationSentToAllUsersHandlerInternal, this,
 		notification, checkable, users, type, cr, author, text));
 }

lib/perfdata/elasticsearchwriter.hpp

@@ -41,8 +41,8 @@ public:
 
 protected:
 	void OnConfigLoaded() override;
-	void Start(bool runtimeCreated) override;
-	void Stop(bool runtimeRemoved) override;
+	void Resume() override;
+	void Pause() override;
 
 private:
 	String m_EventPrefix;

lib/perfdata/elasticsearchwriter.ti

@@ -37,6 +37,9 @@ class ElasticsearchWriter : ConfigObject
 	[config] int flush_threshold {
 		default {{{ return 1024; }}}
 	};
+	[config] bool enable_ha {
+		default {{{ return true; }}}
+	};
 };
 
 }