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//
// Copyright 2012,2014 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/msg.hpp>
#include <uhd/utils/static.hpp>
#include <uhd/utils/paths.hpp>
#include <boost/filesystem.hpp>
#include <boost/format.hpp>
#include <boost/thread/mutex.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/thread/lock_guard.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
#include <fstream>
#include <cctype>
namespace fs = boost::filesystem;
namespace pt = boost::posix_time;
namespace ip = boost::interprocess;
/***********************************************************************
* Global resources for the logger
**********************************************************************/
class log_resource_type{
public:
uhd::_log::verbosity_t level;
log_resource_type(void){
//file lock pointer must be null
_file_lock = NULL;
//set the default log level
level = uhd::_log::never;
//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);
}
~log_resource_type(void){
boost::lock_guard<boost::mutex> lock(_mutex);
_file_stream.close();
if (_file_lock != NULL) delete _file_lock;
}
void log_to_file(const std::string &log_msg){
boost::lock_guard<boost::mutex> lock(_mutex);
if (_file_lock == NULL){
const std::string log_path = (fs::path(uhd::get_tmp_path()) / "uhd.log").string();
_file_stream.open(log_path.c_str(), std::fstream::out | std::fstream::app);
_file_lock = new ip::file_lock(log_path.c_str());
}
_file_lock->lock();
_file_stream << log_msg << std::flush;
_file_lock->unlock();
}
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_num = uhd::_log::verbosity_t(log_level_str[0]-'0');
if (std::isdigit(log_level_str[0]) and log_level_num >= uhd::_log::always and log_level_num <= uhd::_log::never){
this->level = log_level_num;
return;
}
#define if_lls_equal(name) else if(log_level_str == #name) this->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);
if_lls_equal(never);
}
//file stream and lock:
std::ofstream _file_stream;
ip::file_lock *_file_lock;
boost::mutex _mutex;
};
UHD_SINGLETON_FCN(log_resource_type, log_rs);
/***********************************************************************
* 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.parent_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.parent_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
)
{
_log_it = (verbosity >= log_rs().level);
if (_log_it)
{
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()), '-');
_ss << std::endl
<< border << std::endl
<< header1 << std::endl
<< header2 << std::endl
<< header3 << std::endl
<< border << std::endl
;
}
}
uhd::_log::log::~log(void)
{
if (not _log_it)
return;
_ss << std::endl;
try{
log_rs().log_to_file(_ss.str());
}
catch(const std::exception &e){
/*!
* Critical behavior below.
* The following steps must happen in order to avoid a lock-up condition.
* This is because the message facility will call into the logging facility.
* Therefore we must disable the logger (level = never) before messaging.
*/
log_rs().level = never;
UHD_MSG(error)
<< "Logging failed: " << e.what() << std::endl
<< "Logging has been disabled for this process" << std::endl
;
}
}
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