icinga2/lib/icinga/macroprocessor.cpp

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/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012 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. *
******************************************************************************/
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#include "icinga/macroprocessor.h"
#include "icinga/macroresolver.h"
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#include "base/utility.h"
#include "base/array.h"
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#include "base/objectlock.h"
#include "base/logger_fwd.h"
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#include <boost/tuple/tuple.hpp>
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#include <boost/smart_ptr/make_shared.hpp>
#include <boost/foreach.hpp>
using namespace icinga;
Value MacroProcessor::ResolveMacros(const Value& cmd, const std::vector<MacroResolver::Ptr>& resolvers,
const Dictionary::Ptr& cr, const MacroProcessor::EscapeCallback& escapeFn)
{
Value result;
if (cmd.IsScalar()) {
result = InternalResolveMacros(cmd, resolvers, cr, escapeFn);
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} else if (cmd.IsObjectType<Array>()) {
Array::Ptr resultArr = boost::make_shared<Array>();
Array::Ptr arr = cmd;
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ObjectLock olock(arr);
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BOOST_FOREACH(const Value& arg, arr) {
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/* Note: don't escape macros here. */
resultArr->Add(InternalResolveMacros(arg, resolvers, cr, EscapeCallback()));
}
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result = resultArr;
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} else {
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BOOST_THROW_EXCEPTION(std::invalid_argument("Command is not a string or array."));
}
return result;
}
bool MacroProcessor::ResolveMacro(const String& macro, const std::vector<MacroResolver::Ptr>& resolvers,
const Dictionary::Ptr& cr, String *result)
{
BOOST_FOREACH(const MacroResolver::Ptr& resolver, resolvers) {
if (resolver->ResolveMacro(macro, cr, result))
return true;
}
return false;
}
String MacroProcessor::InternalResolveMacros(const String& str, const std::vector<MacroResolver::Ptr>& resolvers,
const Dictionary::Ptr& cr, const MacroProcessor::EscapeCallback& escapeFn)
{
size_t offset, pos_first, pos_second;
offset = 0;
String result = str;
while ((pos_first = result.FindFirstOf("$", offset)) != String::NPos) {
pos_second = result.FindFirstOf("$", pos_first + 1);
if (pos_second == String::NPos)
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BOOST_THROW_EXCEPTION(std::runtime_error("Closing $ not found in macro format string."));
String name = result.SubStr(pos_first + 1, pos_second - pos_first - 1);
String resolved_macro;
bool found = ResolveMacro(name, resolvers, cr, &resolved_macro);
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/* $$ is an escape sequence for $. */
if (name.IsEmpty()) {
resolved_macro = "$";
found = true;
}
if (!found)
Log(LogWarning, "icinga", "Macro '" + name + "' is not defined.");
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result.Replace(pos_first, pos_second - pos_first + 1, resolved_macro);
offset = pos_first + resolved_macro.GetLength();
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}
return result;
}