mirror of https://github.com/Icinga/icinga2.git
338 lines
11 KiB
C++
338 lines
11 KiB
C++
/******************************************************************************
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* Icinga 2 *
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* Copyright (C) 2012-2014 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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#ifndef VMOPS_H
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#define VMOPS_H
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#include "config/i2-config.hpp"
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#include "config/expression.hpp"
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#include "config/configitembuilder.hpp"
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#include "config/applyrule.hpp"
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#include "config/objectrule.hpp"
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#include "base/debuginfo.hpp"
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#include "base/array.hpp"
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#include "base/dictionary.hpp"
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#include "base/scriptfunction.hpp"
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#include "base/scriptglobal.hpp"
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#include "base/exception.hpp"
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#include "base/convert.hpp"
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#include "base/objectlock.hpp"
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#include <boost/foreach.hpp>
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#include <boost/smart_ptr/make_shared.hpp>
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#include <map>
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#include <vector>
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namespace icinga
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{
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class VMOps
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{
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public:
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static inline Value Variable(ScriptFrame& frame, const String& name, const DebugInfo& debugInfo = DebugInfo())
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{
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if (frame.Locals && frame.Locals->Contains(name))
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return frame.Locals->Get(name);
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else if (frame.Self.IsObject() && frame.Locals != static_cast<Object::Ptr>(frame.Self) && HasField(frame.Self, name))
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return GetField(frame.Self, name, debugInfo);
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else
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return ScriptGlobal::Get(name);
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}
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static inline Value FunctionCall(ScriptFrame& frame, const Value& self, const ScriptFunction::Ptr& func, const std::vector<Value>& arguments)
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{
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boost::shared_ptr<ScriptFrame> vframe;
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if (!self.IsEmpty())
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vframe = boost::make_shared<ScriptFrame>(self); /* passes self to the callee using a TLS variable */
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else
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vframe = boost::make_shared<ScriptFrame>();
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return func->Invoke(arguments);
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}
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static inline Value NewFunction(ScriptFrame& frame, const std::vector<String>& args,
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std::map<String, Expression *> *closedVars, const boost::shared_ptr<Expression>& expression)
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{
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return new ScriptFunction(boost::bind(&FunctionWrapper, _1, args,
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EvaluateClosedVars(frame, closedVars), expression));
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}
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static inline Value NewApply(ScriptFrame& frame, const String& type, const String& target, const String& name, const boost::shared_ptr<Expression>& filter,
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const String& fkvar, const String& fvvar, const boost::shared_ptr<Expression>& fterm, std::map<String, Expression *> *closedVars,
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const boost::shared_ptr<Expression>& expression, const DebugInfo& debugInfo = DebugInfo())
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{
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ApplyRule::AddRule(type, target, name, expression, filter, fkvar,
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fvvar, fterm, debugInfo, EvaluateClosedVars(frame, closedVars));
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return Empty;
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}
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static inline Value NewObject(ScriptFrame& frame, bool abstract, const String& type, const String& name, const boost::shared_ptr<Expression>& filter,
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const String& zone, std::map<String, Expression *> *closedVars, const boost::shared_ptr<Expression>& expression, const DebugInfo& debugInfo = DebugInfo())
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{
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ConfigItemBuilder::Ptr item = new ConfigItemBuilder(debugInfo);
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String checkName = name;
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if (!abstract) {
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Type::Ptr ptype = Type::GetByName(type);
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NameComposer *nc = dynamic_cast<NameComposer *>(ptype.get());
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if (nc)
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checkName = nc->MakeName(name, Dictionary::Ptr());
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}
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if (!checkName.IsEmpty()) {
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ConfigItem::Ptr oldItem = ConfigItem::GetObject(type, checkName);
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if (oldItem) {
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std::ostringstream msgbuf;
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msgbuf << "Object '" << name << "' of type '" << type << "' re-defined: " << debugInfo << "; previous definition: " << oldItem->GetDebugInfo();
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BOOST_THROW_EXCEPTION(ScriptError(msgbuf.str(), debugInfo));
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}
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}
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item->SetType(type);
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if (name.FindFirstOf("!") != String::NPos) {
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std::ostringstream msgbuf;
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msgbuf << "Name for object '" << name << "' of type '" << type << "' is invalid: Object names may not contain '!'";
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BOOST_THROW_EXCEPTION(ScriptError(msgbuf.str(), debugInfo));
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}
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item->SetName(name);
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item->AddExpression(new OwnedExpression(expression));
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item->SetAbstract(abstract);
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item->SetScope(EvaluateClosedVars(frame, closedVars));
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item->SetZone(zone);
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item->SetFilter(filter);
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item->Compile()->Register();
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return Empty;
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}
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static inline Value For(ScriptFrame& frame, const String& fkvar, const String& fvvar, const Value& value, Expression *expression, const DebugInfo& debugInfo = DebugInfo())
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{
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if (value.IsObjectType<Array>()) {
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if (!fvvar.IsEmpty())
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BOOST_THROW_EXCEPTION(ScriptError("Cannot use dictionary iterator for array.", debugInfo));
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Array::Ptr arr = value;
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ObjectLock olock(arr);
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BOOST_FOREACH(const Value& value, arr) {
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frame.Locals->Set(fkvar, value);
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expression->Evaluate(frame);
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}
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} else if (value.IsString()) {
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if (!fvvar.IsEmpty())
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BOOST_THROW_EXCEPTION(ScriptError("Cannot use dictionary iterator for string.", debugInfo));
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String str = value;
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BOOST_FOREACH(char ch, str) {
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frame.Locals->Set(fkvar, String(1, ch));
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expression->Evaluate(frame);
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}
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} else if (value.IsObjectType<Dictionary>()) {
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if (fvvar.IsEmpty())
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BOOST_THROW_EXCEPTION(ScriptError("Cannot use array iterator for dictionary.", debugInfo));
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Dictionary::Ptr dict = value;
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ObjectLock olock(dict);
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BOOST_FOREACH(const Dictionary::Pair& kv, dict) {
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frame.Locals->Set(fkvar, kv.first);
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frame.Locals->Set(fvvar, kv.second);
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expression->Evaluate(frame);
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}
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} else
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BOOST_THROW_EXCEPTION(ScriptError("Invalid type in for expression: " + value.GetTypeName(), debugInfo));
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return Empty;
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}
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static inline bool HasField(const Object::Ptr& context, const String& field)
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{
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Dictionary::Ptr dict = dynamic_pointer_cast<Dictionary>(context);
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if (dict)
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return dict->Contains(field);
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else {
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Type::Ptr type = context->GetReflectionType();
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if (!type)
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return false;
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return type->GetFieldId(field) != -1;
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}
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}
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static inline Value GetPrototypeField(const Value& context, const String& field, bool not_found_error = true, const DebugInfo& debugInfo = DebugInfo())
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{
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Type::Ptr type = context.GetReflectionType();
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do {
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Object::Ptr object = type->GetPrototype();
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if (object && HasField(object, field))
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return GetField(object, field, debugInfo);
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type = type->GetBaseType();
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} while (type);
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if (not_found_error)
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BOOST_THROW_EXCEPTION(ScriptError("Invalid field name: '" + field + "'", debugInfo));
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else
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return Empty;
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}
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static inline Value GetField(const Value& context, const String& field, const DebugInfo& debugInfo = DebugInfo())
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{
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if (context.IsEmpty())
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return Empty;
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if (!context.IsObject())
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return GetPrototypeField(context, field, true, debugInfo);
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Object::Ptr object = context;
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Dictionary::Ptr dict = dynamic_pointer_cast<Dictionary>(object);
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if (dict) {
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if (dict->Contains(field))
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return dict->Get(field);
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else
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return GetPrototypeField(context, field, false, debugInfo);
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}
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Array::Ptr arr = dynamic_pointer_cast<Array>(object);
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if (arr) {
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int index;
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try {
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index = Convert::ToLong(field);
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} catch (...) {
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return GetPrototypeField(context, field, true, debugInfo);
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}
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return arr->Get(index);
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}
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Type::Ptr type = object->GetReflectionType();
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if (!type)
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return Empty;
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int fid = type->GetFieldId(field);
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if (fid == -1)
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return GetPrototypeField(context, field, true, debugInfo);
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return object->GetField(fid);
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}
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static inline void SetField(const Object::Ptr& context, const String& field, const Value& value, const DebugInfo& debugInfo = DebugInfo())
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{
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Dictionary::Ptr dict = dynamic_pointer_cast<Dictionary>(context);
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if (dict) {
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dict->Set(field, value);
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return;
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}
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Array::Ptr arr = dynamic_pointer_cast<Array>(context);
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if (arr) {
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int index = Convert::ToLong(field);
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if (index >= arr->GetLength())
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arr->Resize(index + 1);
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arr->Set(index, value);
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return;
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}
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Type::Ptr type = context->GetReflectionType();
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if (!type)
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BOOST_THROW_EXCEPTION(ScriptError("Cannot set field on object.", debugInfo));
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int fid = type->GetFieldId(field);
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if (fid == -1)
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BOOST_THROW_EXCEPTION(ScriptError("Attribute '" + field + "' does not exist.", debugInfo));
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try {
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context->SetField(fid, value);
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} catch (const boost::bad_lexical_cast&) {
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BOOST_THROW_EXCEPTION(ScriptError("Attribute '" + field + "' cannot be set to value of type '" + value.GetTypeName() + "'", debugInfo));
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} catch (const std::bad_cast&) {
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BOOST_THROW_EXCEPTION(ScriptError("Attribute '" + field + "' cannot be set to value of type '" + value.GetTypeName() + "'", debugInfo));
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}
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}
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private:
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static inline Value FunctionWrapper(const std::vector<Value>& arguments,
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const std::vector<String>& funcargs, const Dictionary::Ptr& closedVars, const boost::shared_ptr<Expression>& expr)
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{
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if (arguments.size() < funcargs.size())
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BOOST_THROW_EXCEPTION(std::invalid_argument("Too few arguments for function"));
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ScriptFrame *vframe = ScriptFrame::GetCurrentFrame();
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ScriptFrame frame(vframe->Self);
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if (closedVars)
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closedVars->CopyTo(frame.Locals);
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for (std::vector<Value>::size_type i = 0; i < std::min(arguments.size(), funcargs.size()); i++)
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frame.Locals->Set(funcargs[i], arguments[i]);
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Value result;
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try {
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result = expr->Evaluate(frame);
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} catch (const InterruptExecutionError& iee) {
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result = iee.GetResult();
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}
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return result;
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}
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static inline Dictionary::Ptr EvaluateClosedVars(ScriptFrame& frame, std::map<String, Expression *> *closedVars)
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{
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Dictionary::Ptr locals;
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if (closedVars) {
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locals = new Dictionary();
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typedef std::pair<String, Expression *> ClosedVar;
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BOOST_FOREACH(const ClosedVar& cvar, *closedVars) {
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locals->Set(cvar.first, cvar.second->Evaluate(frame));
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}
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}
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return locals;
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}
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};
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}
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#endif /* VMOPS_H */
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