mirror of https://github.com/Icinga/icinga2.git
613 lines
15 KiB
C++
613 lines
15 KiB
C++
/******************************************************************************
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* Icinga 2 *
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* Copyright (C) 2012 Icinga Development Team (http://www.icinga.org/) *
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* *
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* This program is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU General Public License *
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* as published by the Free Software Foundation; either version 2 *
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* of the License, or (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the Free Software Foundation *
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
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******************************************************************************/
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#include "i2-base.h"
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using namespace icinga;
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double DynamicObject::m_CurrentTx = 0;
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set<DynamicObject::WeakPtr> DynamicObject::m_ModifiedObjects;
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boost::mutex DynamicObject::m_TransactionMutex;
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boost::once_flag DynamicObject::m_TransactionOnce;
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Timer::Ptr DynamicObject::m_TransactionTimer;
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signals2::signal<void (const DynamicObject::Ptr&)> DynamicObject::OnRegistered;
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signals2::signal<void (const DynamicObject::Ptr&)> DynamicObject::OnUnregistered;
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signals2::signal<void (double, const set<DynamicObject::WeakPtr>&)> DynamicObject::OnTransactionClosing;
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signals2::signal<void (const DynamicObject::Ptr&)> DynamicObject::OnFlushObject;
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DynamicObject::DynamicObject(const Dictionary::Ptr& serializedObject)
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: m_EventSafe(false), m_ConfigTx(0)
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{
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RegisterAttribute("__name", Attribute_Config);
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RegisterAttribute("__type", Attribute_Config);
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RegisterAttribute("__local", Attribute_Config);
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RegisterAttribute("__abstract", Attribute_Config);
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RegisterAttribute("__source", Attribute_Local);
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RegisterAttribute("methods", Attribute_Config);
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{
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ObjectLock olock(serializedObject);
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if (!serializedObject->Contains("configTx"))
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BOOST_THROW_EXCEPTION(invalid_argument("Serialized object must contain a config snapshot."));
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}
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/* apply config state from the config item/remote update;
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* The DynamicObject::Create function takes care of restoring
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* non-config state after the object has been fully constructed */
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{
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ObjectLock olock(this);
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ApplyUpdate(serializedObject, Attribute_Config);
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}
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boost::call_once(m_TransactionOnce, &DynamicObject::Initialize);
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}
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/*
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* @threadsafety Always.
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*/
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DynamicObject::~DynamicObject(void)
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{ }
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void DynamicObject::Initialize(void)
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{
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/* Set up a timer to periodically create a new transaction. */
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m_TransactionTimer = boost::make_shared<Timer>();
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m_TransactionTimer->SetInterval(0.5);
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m_TransactionTimer->OnTimerExpired.connect(boost::bind(&DynamicObject::NewTx));
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m_TransactionTimer->Start();
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}
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/**
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* @threadsafety Always.
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*/
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void DynamicObject::SendLocalUpdateEvents(void)
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{
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map<String, Value, string_iless> attrs;
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{
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ObjectLock olock(this);
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attrs.swap(m_ModifiedAttributes);
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}
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/* Check if it's safe to send events. */
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if (GetEventSafe()) {
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map<String, Value, string_iless>::iterator it;
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for (it = attrs.begin(); it != attrs.end(); it++)
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OnAttributeChanged(it->first, it->second);
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}
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}
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Dictionary::Ptr DynamicObject::BuildUpdate(double sinceTx, int attributeTypes) const
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{
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DynamicObject::AttributeConstIterator it;
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Dictionary::Ptr attrs = boost::make_shared<Dictionary>();
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for (it = m_Attributes.begin(); it != m_Attributes.end(); it++) {
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if (it->second.Type == Attribute_Transient)
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continue;
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if ((it->second.Type & attributeTypes) == 0)
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continue;
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if (it->second.Tx == 0)
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continue;
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if (it->second.Tx < sinceTx && !(it->second.Type == Attribute_Config && m_ConfigTx >= sinceTx))
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continue;
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Dictionary::Ptr attr = boost::make_shared<Dictionary>();
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attr->Set("data", it->second.Data);
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attr->Set("type", it->second.Type);
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attr->Set("tx", it->second.Tx);
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attrs->Set(it->first, attr);
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}
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Dictionary::Ptr update = boost::make_shared<Dictionary>();
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update->Set("attrs", attrs);
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if (m_ConfigTx >= sinceTx && attributeTypes & Attribute_Config)
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update->Set("configTx", m_ConfigTx);
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else if (attrs->GetLength() == 0)
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return Dictionary::Ptr();
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return update;
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}
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void DynamicObject::ApplyUpdate(const Dictionary::Ptr& serializedUpdate,
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int allowedTypes)
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{
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Dictionary::Ptr attrs;
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{
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ObjectLock olock(serializedUpdate);
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double configTx = 0;
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if ((allowedTypes & Attribute_Config) != 0 &&
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serializedUpdate->Contains("configTx")) {
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configTx = serializedUpdate->Get("configTx");
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if (configTx > m_ConfigTx)
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ClearAttributesByType(Attribute_Config);
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}
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attrs = serializedUpdate->Get("attrs");
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}
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{
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ObjectLock olock(attrs);
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Dictionary::Iterator it;
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for (it = attrs->Begin(); it != attrs->End(); it++) {
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if (!it->second.IsObjectType<Dictionary>())
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continue;
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Dictionary::Ptr attr = it->second;
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ObjectLock alock(attr);
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int type = attr->Get("type");
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if ((type & ~allowedTypes) != 0)
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continue;
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Value data = attr->Get("data");
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double tx = attr->Get("tx");
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if (type & Attribute_Config)
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RegisterAttribute(it->first, Attribute_Config);
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if (!HasAttribute(it->first))
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RegisterAttribute(it->first, static_cast<DynamicAttributeType>(type));
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InternalSetAttribute(it->first, data, tx, true);
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}
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}
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}
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void DynamicObject::RegisterAttribute(const String& name,
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DynamicAttributeType type)
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{
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DynamicAttribute attr;
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attr.Type = type;
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attr.Tx = 0;
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pair<DynamicObject::AttributeIterator, bool> tt;
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tt = m_Attributes.insert(make_pair(name, attr));
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if (!tt.second)
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tt.first->second.Type = type;
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}
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void DynamicObject::Set(const String& name, const Value& data)
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{
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InternalSetAttribute(name, data, GetCurrentTx());
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}
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void DynamicObject::Touch(const String& name)
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{
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InternalSetAttribute(name, InternalGetAttribute(name), GetCurrentTx());
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}
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Value DynamicObject::Get(const String& name) const
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{
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return InternalGetAttribute(name);
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}
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void DynamicObject::InternalSetAttribute(const String& name, const Value& data,
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double tx, bool allowEditConfig)
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{
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DynamicAttribute attr;
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attr.Type = Attribute_Transient;
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attr.Data = data;
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attr.Tx = tx;
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pair<DynamicObject::AttributeIterator, bool> tt;
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tt = m_Attributes.insert(make_pair(name, attr));
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Value oldValue;
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if (!allowEditConfig && (tt.first->second.Type & Attribute_Config))
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BOOST_THROW_EXCEPTION(runtime_error("Config properties are immutable: '" + name + "'."));
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if (!tt.second && tx >= tt.first->second.Tx) {
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oldValue = tt.first->second.Data;
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tt.first->second.Data = data;
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tt.first->second.Tx = tx;
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}
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if (tt.first->second.Type & Attribute_Config)
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m_ConfigTx = tx;
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if (GetEventSafe()) {
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/* We can't call GetSelf() in the constructor or destructor.
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* The OnConstructionCompleted() function will take care of adding this
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* object to the list of modified objects later on if we can't
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* do it here. */
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boost::mutex::scoped_lock lock(m_TransactionMutex);
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m_ModifiedObjects.insert(GetSelf());
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}
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/* Use insert() rather than [] so we don't overwrite
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* an existing oldValue if the attribute was previously
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* changed in the same transaction */
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m_ModifiedAttributes.insert(make_pair(name, oldValue));
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}
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Value DynamicObject::InternalGetAttribute(const String& name) const
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{
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DynamicObject::AttributeConstIterator it;
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it = m_Attributes.find(name);
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if (it == m_Attributes.end())
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return Empty;
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return it->second.Data;
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}
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bool DynamicObject::HasAttribute(const String& name) const
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{
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return (m_Attributes.find(name) != m_Attributes.end());
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}
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void DynamicObject::ClearAttributesByType(DynamicAttributeType type)
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{
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DynamicObject::AttributeIterator at;
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for (at = m_Attributes.begin(); at != m_Attributes.end(); at++) {
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if (at->second.Type != type)
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continue;
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at->second.Tx = 0;
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at->second.Data = Empty;
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}
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}
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DynamicType::Ptr DynamicObject::GetType(void) const
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{
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String name = Get("__type");
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return DynamicType::GetByName(name);
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}
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String DynamicObject::GetName(void) const
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{
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return Get("__name");
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}
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bool DynamicObject::IsLocal(void) const
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{
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Value value = Get("__local");
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if (value.IsEmpty())
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return false;
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return (value != 0);
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}
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bool DynamicObject::IsAbstract(void) const
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{
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Value value = Get("__abstract");
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if (value.IsEmpty())
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return false;
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return (value != 0);
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}
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void DynamicObject::SetSource(const String& value)
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{
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Set("__source", value);
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}
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String DynamicObject::GetSource(void) const
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{
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return Get("__source");
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}
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void DynamicObject::Register(void)
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{
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{
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DynamicType::Ptr dtype = GetType();
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ObjectLock olock(dtype);
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DynamicObject::Ptr dobj = dtype->GetObject(GetName());
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DynamicObject::Ptr self = GetSelf();
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assert(!dobj || dobj == self);
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if (!dobj)
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dtype->RegisterObject(self);
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}
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OnRegistered(GetSelf());
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Start();
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}
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void DynamicObject::Start(void)
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{
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/* Nothing to do here. */
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}
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void DynamicObject::Unregister(void)
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{
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DynamicType::Ptr dtype = GetType();
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ObjectLock olock(dtype);
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if (!dtype || !dtype->GetObject(GetName()))
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return;
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dtype->UnregisterObject(GetSelf());
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OnUnregistered(GetSelf());
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}
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ScriptTask::Ptr DynamicObject::MakeMethodTask(const String& method,
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const vector<Value>& arguments)
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{
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Value value = Get("methods");
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if (!value.IsObjectType<Dictionary>())
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return ScriptTask::Ptr();
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String funcName;
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Dictionary::Ptr methods = value;
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{
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ObjectLock olock(methods);
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if (!methods->Contains(method))
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return ScriptTask::Ptr();
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funcName = methods->Get(method);
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}
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ScriptFunction::Ptr func = ScriptFunction::GetByName(funcName);
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if (!func)
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BOOST_THROW_EXCEPTION(invalid_argument("Function '" + funcName + "' does not exist."));
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return boost::make_shared<ScriptTask>(func, arguments);
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}
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/*
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* @threadsafety Always.
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*/
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void DynamicObject::DumpObjects(const String& filename)
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{
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Logger::Write(LogInformation, "base", "Dumping program state to file '" + filename + "'");
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String tempFilename = filename + ".tmp";
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fstream fp;
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fp.open(tempFilename.CStr(), std::ios_base::out);
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if (!fp)
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BOOST_THROW_EXCEPTION(runtime_error("Could not open '" + filename + "' file"));
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StdioStream::Ptr sfp = boost::make_shared<StdioStream>(&fp, false);
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sfp->Start();
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;
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BOOST_FOREACH(const DynamicType::Ptr& type, DynamicType::GetTypes()) {
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BOOST_FOREACH(const DynamicObject::Ptr& object, type->GetObjects()) {
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if (object->IsLocal())
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continue;
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Dictionary::Ptr persistentObject = boost::make_shared<Dictionary>();
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persistentObject->Set("type", object->GetType()->GetName());
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persistentObject->Set("name", object->GetName());
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int types = Attribute_Local | Attribute_Replicated;
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/* only persist properties for replicated objects or for objects
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* that are marked as persistent */
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if (!object->GetSource().IsEmpty() /*|| object->IsPersistent()*/)
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types |= Attribute_Config;
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Dictionary::Ptr update = object->BuildUpdate(0, types);
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if (!update)
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continue;
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persistentObject->Set("update", update);
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Value value = persistentObject;
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String json = value.Serialize();
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NetString::WriteStringToStream(sfp, json);
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}
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}
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sfp->Close();
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fp.close();
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#ifdef _WIN32
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_unlink(filename.CStr());
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#endif /* _WIN32 */
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if (rename(tempFilename.CStr(), filename.CStr()) < 0)
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BOOST_THROW_EXCEPTION(PosixException("rename() failed", errno));
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}
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/*
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* @threadsafety Always.
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*/
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void DynamicObject::RestoreObjects(const String& filename)
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{
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Logger::Write(LogInformation, "base", "Restoring program state from file '" + filename + "'");
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std::fstream fp;
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fp.open(filename.CStr(), std::ios_base::in);
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StdioStream::Ptr sfp = boost::make_shared<StdioStream>(&fp, false);
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sfp->Start();
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unsigned long restored = 0;
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String message;
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while (NetString::ReadStringFromStream(sfp, &message)) {
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Dictionary::Ptr persistentObject = Value::Deserialize(message);
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String type = persistentObject->Get("type");
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String name = persistentObject->Get("name");
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Dictionary::Ptr update = persistentObject->Get("update");
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bool hasConfig = update->Contains("configTx");
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DynamicType::Ptr dt = DynamicType::GetByName(type);
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ObjectLock dlock(dt);
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if (!dt)
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BOOST_THROW_EXCEPTION(invalid_argument("Invalid type: " + type));
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DynamicObject::Ptr object = dt->GetObject(name);
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if (hasConfig && !object) {
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object = dt->CreateObject(update);
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object->Register();
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} else if (object) {
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object->ApplyUpdate(update, Attribute_All);
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}
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restored++;
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}
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sfp->Close();
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stringstream msgbuf;
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msgbuf << "Restored " << restored << " objects";
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Logger::Write(LogDebug, "base", msgbuf.str());
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}
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void DynamicObject::DeactivateObjects(void)
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{
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BOOST_FOREACH(const DynamicType::Ptr& dt, DynamicType::GetTypes()) {
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set<DynamicObject::Ptr> objects;
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{
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ObjectLock olock(dt);
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objects = dt->GetObjects();
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}
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BOOST_FOREACH(const DynamicObject::Ptr& object, objects) {
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ObjectLock olock(object);
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object->Unregister();
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}
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}
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}
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/*
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* @threadsafety Always.
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*/
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double DynamicObject::GetCurrentTx(void)
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{
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boost::mutex::scoped_lock lock(m_TransactionMutex);
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if (m_CurrentTx == 0) {
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/* Set the initial transaction ID. */
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m_CurrentTx = Utility::GetTime();
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}
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return m_CurrentTx;
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}
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void DynamicObject::Flush(void)
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{
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SendLocalUpdateEvents();
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OnFlushObject(GetSelf());
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}
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/*
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* @threadsafety Always. Caller must not hold any Object locks.
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*/
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void DynamicObject::NewTx(void)
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{
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double tx;
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set<DynamicObject::WeakPtr> objects;
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{
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boost::mutex::scoped_lock lock(m_TransactionMutex);
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tx = m_CurrentTx;
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m_ModifiedObjects.swap(objects);
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m_CurrentTx = Utility::GetTime();
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}
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BOOST_FOREACH(const DynamicObject::WeakPtr& wobject, objects) {
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DynamicObject::Ptr object = wobject.lock();
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if (!object)
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continue;
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object->SendLocalUpdateEvents();
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}
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OnTransactionClosing(tx, objects);
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}
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void DynamicObject::OnConstructionCompleted(void)
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{
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/* It's now safe to send us attribute events. */
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SetEventSafe(true);
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/* Add this new object to the list of modified objects.
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* We're doing this here because we can't construct
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* a while WeakPtr from within the object's constructor. */
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boost::mutex::scoped_lock lock(m_TransactionMutex);
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m_ModifiedObjects.insert(GetSelf());
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}
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void DynamicObject::OnRegistrationCompleted(void)
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{ }
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void DynamicObject::OnAttributeChanged(const String&, const Value&)
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{ }
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/*
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* @threadsafety Always.
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*/
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DynamicObject::Ptr DynamicObject::GetObject(const String& type, const String& name)
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{
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DynamicType::Ptr dtype = DynamicType::GetByName(type);
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{
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ObjectLock olock(dtype);
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return dtype->GetObject(name);
|
|
}
|
|
}
|
|
|
|
const DynamicObject::AttributeMap& DynamicObject::GetAttributes(void) const
|
|
{
|
|
return m_Attributes;
|
|
}
|
|
|
|
void DynamicObject::SetEventSafe(bool safe)
|
|
{
|
|
m_EventSafe = safe;
|
|
}
|
|
|
|
bool DynamicObject::GetEventSafe(void) const
|
|
{
|
|
return m_EventSafe;
|
|
}
|