icinga2/lib/config/vmops.hpp

338 lines
11 KiB
C++

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