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//
// Copyright 2011 Ettus Research LLC
//
// 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 3 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, see <http://www.gnu.org/licenses/>.
//
#include <uhd/utils/log.hpp>
#include <uhd/utils/static.hpp>
#include <boost/filesystem.hpp>
#include <boost/format.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
#ifdef BOOST_MSVC
//whoops! https://svn.boost.org/trac/boost/ticket/5287
//enjoy this useless dummy class instead
namespace boost{ namespace interprocess{
struct file_lock{
file_lock(const char * = NULL){}
void lock(void){}
void unlock(void){}
};
}} //namespace
#else
#include <boost/interprocess/sync/file_lock.hpp>
#endif
#ifdef BOOST_MSVC
#define USE_GET_TEMP_PATH
#include <Windows.h> //GetTempPath
#endif
#include <stdio.h> //P_tmpdir
#include <cstdlib> //getenv
#include <fstream>
#include <cctype>
namespace fs = boost::filesystem;
namespace pt = boost::posix_time;
namespace ip = boost::interprocess;
/***********************************************************************
* Helper function to get the system's temporary path
**********************************************************************/
static fs::path get_temp_path(void){
const char *tmp_path = NULL;
//try the official uhd temp path environment variable
tmp_path = std::getenv("UHD_TEMP_PATH");
if (tmp_path != NULL) return tmp_path;
//try the windows function if available
#ifdef USE_GET_TEMP_PATH
char lpBuffer[2048];
if (GetTempPath(sizeof(lpBuffer), lpBuffer)) return lpBuffer;
#endif
//try windows environment variables
tmp_path = std::getenv("TMP");
if (tmp_path != NULL) return tmp_path;
tmp_path = std::getenv("TEMP");
if (tmp_path != NULL) return tmp_path;
//try the stdio define if available
#ifdef P_tmpdir
return P_tmpdir;
#endif
//try unix environment variables
tmp_path = std::getenv("TMPDIR");
if (tmp_path != NULL) return tmp_path;
//give up and use the unix default
return "/tmp";
}
/***********************************************************************
* The library's streamer resource (static initialization)
**********************************************************************/
class null_streambuf_class : public std::streambuf{
int overflow(int c) { return c; }
};
UHD_SINGLETON_FCN(null_streambuf_class, null_streambuf);
class uhd_logger_stream_resource_class{
public:
uhd_logger_stream_resource_class(void) : _null_stream(&null_streambuf()){
const std::string log_path = (get_temp_path() / "uhd.log").string();
_file_stream.open(log_path.c_str(), std::fstream::out | std::fstream::app);
_file_lock = ip::file_lock(log_path.c_str());
//set the default log level
_log_level = uhd::_log::regularly;
//allow override from macro definition
#ifdef UHD_LOG_LEVEL
_set_log_level(BOOST_STRINGIZE(UHD_LOG_LEVEL));
#endif
//allow override from environment variable
const char * log_level_env = std::getenv("UHD_LOG_LEVEL");
if (log_level_env != NULL) _set_log_level(log_level_env);
}
~uhd_logger_stream_resource_class(void){
_file_stream.close();
}
std::ostream &get(void){
if (_verbosity >= _log_level) return _file_stream;
return _null_stream;
}
void aquire(bool lock){
if (lock){
_mutex.lock();
_file_lock.lock();
}
else{
_file_lock.unlock();
_mutex.unlock();
}
}
void set_verbosity(uhd::_log::verbosity_t verbosity){
_verbosity = verbosity;
}
private:
//! set the log level from a string that is either a digit or an enum name
void _set_log_level(const std::string &log_level_str){
const uhd::_log::verbosity_t log_level = uhd::_log::verbosity_t(log_level_str[0]-'0');
if (std::isdigit(log_level_str[0]) and log_level >= uhd::_log::always and log_level <= uhd::_log::very_rarely){
_log_level = log_level;
}
#define if_lls_equal(name) else if(log_level_str == #name) _log_level = uhd::_log::name
if_lls_equal(always);
if_lls_equal(often);
if_lls_equal(regularly);
if_lls_equal(rarely);
if_lls_equal(very_rarely);
}
//available stream objects
std::ofstream _file_stream;
std::ostream _null_stream;
//synchronization mechanisms
boost::mutex _mutex; //process-level
ip::file_lock _file_lock; //system-level
//log-level settings
uhd::_log::verbosity_t _verbosity;
uhd::_log::verbosity_t _log_level;
};
UHD_SINGLETON_FCN(uhd_logger_stream_resource_class, uhd_logger_stream_resource);
/***********************************************************************
* The logger object implementation
**********************************************************************/
//! get the relative file path from the host directory
static std::string get_rel_file_path(const fs::path &file){
fs::path abs_path = file.branch_path();
fs::path rel_path = file.leaf();
while (not abs_path.empty() and abs_path.leaf() != "host"){
rel_path = abs_path.leaf() / rel_path;
abs_path = abs_path.branch_path();
}
return rel_path.string();
}
uhd::_log::log::log(
const verbosity_t verbosity,
const std::string &file,
const unsigned int line,
const std::string &function
){
uhd_logger_stream_resource().aquire(true);
uhd_logger_stream_resource().set_verbosity(verbosity);
const std::string time = pt::to_simple_string(pt::microsec_clock::local_time());
const std::string header1 = str(boost::format("-- %s - level %d") % time % int(verbosity));
const std::string header2 = str(boost::format("-- %s") % function).substr(0, 80);
const std::string header3 = str(boost::format("-- %s:%u") % get_rel_file_path(file) % line);
const std::string border = std::string(std::max(std::max(header1.size(), header2.size()), header3.size()), '-');
uhd_logger_stream_resource().get()
<< std::endl
<< border << std::endl
<< header1 << std::endl
<< header2 << std::endl
<< header3 << std::endl
<< border << std::endl
;
}
uhd::_log::log::~log(void){
uhd_logger_stream_resource().get() << std::endl;
uhd_logger_stream_resource().aquire(false);
}
std::ostream & uhd::_log::log::get(void){
return uhd_logger_stream_resource().get();
}
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