icinga2/lib/config/configcompiler.cpp

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/******************************************************************************
* 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. *
******************************************************************************/
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#include "config/configcompiler.h"
#include "config/configitem.h"
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#include "base/logger_fwd.h"
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#include "base/utility.h"
#include "base/context.h"
#include "base/exception.h"
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#include <sstream>
#include <fstream>
#include <boost/foreach.hpp>
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using std::ifstream;
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using namespace icinga;
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std::vector<String> ConfigCompiler::m_IncludeSearchDirs;
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/**
* Constructor for the ConfigCompiler class.
*
* @param path The path of the configuration file (or another name that
* identifies the source of the configuration text).
* @param input Input stream for the configuration file.
*/
ConfigCompiler::ConfigCompiler(const String& path, std::istream *input)
: m_Path(path), m_Input(input)
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{
InitializeScanner();
}
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/**
* Destructor for the ConfigCompiler class.
*/
ConfigCompiler::~ConfigCompiler(void)
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{
DestroyScanner();
}
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/**
* Reads data from the input stream. Used internally by the lexer.
*
* @param buffer Where to store data.
* @param max_size The maximum number of bytes to read from the stream.
* @returns The actual number of bytes read.
*/
size_t ConfigCompiler::ReadInput(char *buffer, size_t max_size)
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{
m_Input->read(buffer, max_size);
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return static_cast<size_t>(m_Input->gcount());
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}
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/**
* Retrieves the scanner object.
*
* @returns The scanner object.
*/
void *ConfigCompiler::GetScanner(void) const
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{
return m_Scanner;
}
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/**
* Retrieves the path for the input file.
*
* @returns The path.
*/
String ConfigCompiler::GetPath(void) const
{
return m_Path;
}
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/**
* Handles an include directive.
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*
* @param include The path from the include directive.
* @param search Whether to search global include dirs.
* @param debuginfo Debug information.
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*/
void ConfigCompiler::HandleInclude(const String& include, bool search, const DebugInfo& debuginfo)
{
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String path;
if (search || (include.GetLength() > 0 && include[0] == '/'))
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path = include;
else
path = Utility::DirName(GetPath()) + "/" + include;
String includePath = path;
if (search) {
BOOST_FOREACH(const String& dir, m_IncludeSearchDirs) {
String spath = dir + "/" + include;
#ifndef _WIN32
struct stat statbuf;
if (lstat(spath.CStr(), &statbuf) >= 0) {
#else /* _WIN32 */
struct _stat statbuf;
if (_stat(spath.CStr(), &statbuf) >= 0) {
#endif /* _WIN32 */
includePath = spath;
break;
}
}
}
std::vector<ConfigItem::Ptr> items;
if (!Utility::Glob(includePath, boost::bind(&ConfigCompiler::CompileFile, _1), GlobFile) && includePath.FindFirstOf("*?") == String::NPos) {
std::ostringstream msgbuf;
msgbuf << "Include file '" + include + "' does not exist: " << debuginfo;
BOOST_THROW_EXCEPTION(std::invalid_argument(msgbuf.str()));
}
}
/**
* Handles recursive includes.
*
* @param include The directory path.
* @param pattern The file pattern.
* @param debuginfo Debug information.
*/
void ConfigCompiler::HandleIncludeRecursive(const String& include, const String& pattern, const DebugInfo& debuginfo)
{
String path;
if (include.GetLength() > 0 && include[0] == '/')
path = include;
else
path = Utility::DirName(GetPath()) + "/" + include;
Utility::GlobRecursive(path, pattern, boost::bind(&ConfigCompiler::CompileFile, _1), GlobFile);
}
/**
* Handles the library directive.
*
* @param library The name of the library.
*/
void ConfigCompiler::HandleLibrary(const String& library)
{
(void) Utility::LoadExtensionLibrary(library);
}
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/**
* Compiles a stream.
*
* @param path A name identifying the stream.
* @param stream The input stream.
* @returns Configuration items.
*/
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void ConfigCompiler::CompileStream(const String& path, std::istream *stream)
{
CONTEXT("Compiling configuration stream with name '" + path + "'");
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stream->exceptions(std::istream::badbit);
ConfigCompiler ctx(path, stream);
ctx.Compile();
}
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/**
* Compiles a file.
*
* @param path The path.
* @returns Configuration items.
*/
void ConfigCompiler::CompileFile(const String& path)
{
CONTEXT("Compiling configuration file '" + path + "'");
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std::ifstream stream;
stream.open(path.CStr(), std::ifstream::in);
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if (!stream)
BOOST_THROW_EXCEPTION(posix_error()
<< boost::errinfo_api_function("std::ifstream::open")
<< boost::errinfo_errno(errno)
<< boost::errinfo_file_name(path));
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Log(LogInformation, "config", "Compiling config file: " + path);
return CompileStream(path, &stream);
}
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/**
* Compiles a snippet of text.
*
* @param path A name identifying the text.
* @param text The text.
* @returns Configuration items.
*/
void ConfigCompiler::CompileText(const String& path, const String& text)
{
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std::stringstream stream(text);
return CompileStream(path, &stream);
}
/**
* Adds a directory to the list of include search dirs.
*
* @param dir The new dir.
*/
void ConfigCompiler::AddIncludeSearchDir(const String& dir)
{
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Log(LogInformation, "config", "Adding include search dir: " + dir);
m_IncludeSearchDirs.push_back(dir);
}