Reimplement load-balancing for checks.

Refs #6107

components/checker/checkercomponent.cpp

@@ -64,6 +64,8 @@ void CheckerComponent::OnConfigLoaded(void)
 {
 	DynamicObject::OnStarted.connect(bind(&CheckerComponent::ObjectHandler, this, _1));
 	DynamicObject::OnStopped.connect(bind(&CheckerComponent::ObjectHandler, this, _1));
+	DynamicObject::OnPaused.connect(bind(&CheckerComponent::ObjectHandler, this, _1));
+	DynamicObject::OnResumed.connect(bind(&CheckerComponent::ObjectHandler, this, _1));
 
 	Checkable::OnNextCheckChanged.connect(bind(&CheckerComponent::NextCheckChangedHandler, this, _1));
 }
@@ -257,7 +259,7 @@ void CheckerComponent::ObjectHandler(const DynamicObject::Ptr& object)
 	{
 		boost::mutex::scoped_lock lock(m_Mutex);
 
-		if (object->IsActive() && same_zone) {
+		if (object->IsActive() && !object->IsPaused() && same_zone) {
 			if (m_PendingCheckables.find(checkable) != m_PendingCheckables.end())
 				return;
 

lib/base/dynamicobject.cpp

@@ -44,6 +44,8 @@ INITIALIZE_ONCE(&DynamicObject::StaticInitialize);
 
 boost::signals2::signal<void (const DynamicObject::Ptr&)> DynamicObject::OnStarted;
 boost::signals2::signal<void (const DynamicObject::Ptr&)> DynamicObject::OnStopped;
+boost::signals2::signal<void (const DynamicObject::Ptr&)> DynamicObject::OnPaused;
+boost::signals2::signal<void (const DynamicObject::Ptr&)> DynamicObject::OnResumed;
 boost::signals2::signal<void (const DynamicObject::Ptr&)> DynamicObject::OnStateChanged;
 boost::signals2::signal<void (const DynamicObject::Ptr&)> DynamicObject::OnVarsChanged;
 
@@ -70,6 +72,11 @@ bool DynamicObject::IsActive(void) const
 	return GetActive();
 }
 
+bool DynamicObject::IsPaused(void) const
+{
+	return GetPaused();
+}
+
 void DynamicObject::SetExtension(const String& key, const Object::Ptr& object)
 {
 	Dictionary::Ptr extensions = GetExtensions();
@@ -173,6 +180,33 @@ void DynamicObject::OnStateLoaded(void)
 	/* Nothing to do here. */
 }
 
+void DynamicObject::Pause(void)
+{
+	SetPauseCalled(true);
+}
+
+void DynamicObject::Resume(void)
+{
+	SetResumeCalled(true);
+}
+
+void DynamicObject::SetAuthority(bool authority)
+{
+	if (authority && GetPaused()) {
+		SetResumeCalled(false);
+		Resume();
+		ASSERT(GetResumeCalled());
+		SetPaused(false);
+		OnResumed(GetSelf());
+	} else if (!authority && !GetPaused()) {
+		SetPauseCalled(false);
+		Resume();
+		ASSERT(GetPauseCalled());
+		SetPaused(true);
+		OnPaused(GetSelf());
+	}
+}
+
 Value DynamicObject::InvokeMethod(const String& method,
     const std::vector<Value>& arguments)
 {

lib/base/dynamicobject.h

@@ -77,6 +77,8 @@ class I2_BASE_API DynamicObject : public ObjectImpl<DynamicObject>
 
 	static boost::signals2::signal<void (const DynamicObject::Ptr&)> OnStarted;
 	static boost::signals2::signal<void (const DynamicObject::Ptr&)> OnStopped;
+	static boost::signals2::signal<void (const DynamicObject::Ptr&)> OnPaused;
+	static boost::signals2::signal<void (const DynamicObject::Ptr&)> OnResumed;
 	static boost::signals2::signal<void (const DynamicObject::Ptr&)> OnStateChanged;
 	static boost::signals2::signal<void (const DynamicObject::Ptr&)> OnVarsChanged;
 
@@ -85,6 +87,7 @@ class I2_BASE_API DynamicObject : public ObjectImpl<DynamicObject>
 	shared_ptr<DynamicType> GetType(void) const;
 
 	bool IsActive(void) const;
+	bool IsPaused(void) const;
 
 	void SetExtension(const String& key, const Object::Ptr& object);
 	Object::Ptr GetExtension(const String& key);
@@ -102,10 +105,14 @@ class I2_BASE_API DynamicObject : public ObjectImpl<DynamicObject>
 
 	void Activate(void);
 	void Deactivate(void);
+	void SetAuthority(bool authority);
 
 	virtual void Start(void);
 	virtual void Stop(void);
 
+	virtual void Pause(void);
+	virtual void Resume(void);
+
 	virtual void OnConfigLoaded(void);
 	virtual void OnStateLoaded(void);
 

lib/base/dynamicobject.ti

@@ -25,8 +25,11 @@ abstract class DynamicObject
 	[config] Dictionary::Ptr methods;
 	[config] Dictionary::Ptr vars (VarsRaw);
 	[get_protected] bool active;
+	[get_protected] bool paused;
 	[get_protected] bool start_called;
 	[get_protected] bool stop_called;
+	[get_protected] bool pause_called;
+	[get_protected] bool resume_called;
 	Dictionary::Ptr authority_info;
 	[protected] Dictionary::Ptr extensions;
 

lib/remote/CMakeLists.txt

@@ -22,8 +22,9 @@ mkclass_target(zone.ti zone.th)
 mkembedconfig_target(remote-type.conf remote-type.cpp)
 
 add_library(remote SHARED
-  apiclient.cpp apifunction.cpp apilistener.cpp apilistener.th endpoint.cpp
-  endpoint.th jsonrpc.cpp messageorigin.cpp remote-type.cpp zone.cpp zone.th
+  apiclient.cpp apifunction.cpp apilistener.cpp apilistener.th authority.cpp
+  endpoint.cpp endpoint.th jsonrpc.cpp messageorigin.cpp remote-type.cpp
+  zone.cpp zone.th
 )
 
 include_directories(${Boost_INCLUDE_DIRS})

lib/remote/authority.cpp

@@ -0,0 +1,80 @@
+/******************************************************************************
+ * Icinga 2                                                                   *
+ * Copyright (C) 2012-2014 Icinga Development Team (http://www.icinga.org)    *
+ *                                                                            *
+ * This program is free software; you can redistribute it and/or              *
+ * modify it under the terms of the GNU General Public License                *
+ * as published by the Free Software Foundation; either version 2             *
+ * of the License, or (at your option) any later version.                     *
+ *                                                                            *
+ * This program is distributed in the hope that it will be useful,            *
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of             *
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              *
+ * GNU General Public License for more details.                               *
+ *                                                                            *
+ * You should have received a copy of the GNU General Public License          *
+ * along with this program; if not, write to the Free Software Foundation     *
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.             *
+ ******************************************************************************/
+
+#include "remote/zone.h"
+#include "remote/apilistener.h"
+#include "base/application.h"
+#include "base/dynamictype.h"
+#include "base/objectlock.h"
+#include "base/utility.h"
+#include "base/initialize.h"
+#include "base/timer.h"
+#include "base/logger_fwd.h"
+#include "base/exception.h"
+
+using namespace icinga;
+
+static Timer::Ptr l_AuthorityTimer;
+
+static bool ObjectNameLessComparer(const DynamicObject::Ptr& a, const DynamicObject::Ptr& b)
+{
+	return a->GetName() < b->GetName();
+}
+
+static void AuthorityTimerHandler(void)
+{
+	ApiListener::Ptr listener = ApiListener::GetInstance();
+
+	if (!listener || !listener->IsActive())
+		return;
+
+	Zone::Ptr my_zone = Zone::GetLocalZone();
+	Endpoint::Ptr my_endpoint = Endpoint::GetLocalEndpoint();
+
+	std::vector<Endpoint::Ptr> endpoints;
+	BOOST_FOREACH(const Endpoint::Ptr& endpoint, my_zone->GetEndpoints()) {
+		if (!endpoint->IsConnected() && endpoint != my_endpoint)
+			continue;
+
+		endpoints.push_back(endpoint);
+	}
+
+	std::sort(endpoints.begin(), endpoints.end(), ObjectNameLessComparer);
+
+	BOOST_FOREACH(const DynamicType::Ptr& type, DynamicType::GetTypes()) {
+		BOOST_FOREACH(const DynamicObject::Ptr& object, type->GetObjects()) {
+			Endpoint::Ptr endpoint = endpoints[Utility::SDBM(object->GetName()) % endpoints.size()];
+
+			if (endpoint == my_endpoint)
+				object->Resume();
+			else
+				object->Pause();
+		}
+	}
+}
+
+static void StaticInitialize(void)
+{
+	l_AuthorityTimer = make_shared<Timer>();
+	l_AuthorityTimer->OnTimerExpired.connect(boost::bind(&AuthorityTimerHandler));
+	l_AuthorityTimer->SetInterval(30);
+	l_AuthorityTimer->Start();
+}
+
+INITIALIZE_ONCE(StaticInitialize);