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Diffstat (limited to 'host/lib/utils/log.cpp')
| -rw-r--r-- | host/lib/utils/log.cpp | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/host/lib/utils/log.cpp b/host/lib/utils/log.cpp new file mode 100644 index 000000000..d6d1786c7 --- /dev/null +++ b/host/lib/utils/log.cpp @@ -0,0 +1,180 @@ +// +// Copyright 2012 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> +#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 <sstream> +#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::mutex::scoped_lock lock(_mutex); + _file_stream.close(); + if (_file_lock != NULL) delete _file_lock; + } + + void log_to_file(const std::string &log_msg){ + boost::mutex::scoped_lock 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.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(); +} + +struct uhd::_log::log::impl{ + std::ostringstream ss; + verbosity_t verbosity; +}; + +uhd::_log::log::log( + const verbosity_t verbosity, + const std::string &file, + const unsigned int line, + const std::string &function +){ + _impl = UHD_PIMPL_MAKE(impl, ()); + _impl->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()), '-'); + _impl->ss + << std::endl + << border << std::endl + << header1 << std::endl + << header2 << std::endl + << header3 << std::endl + << border << std::endl + ; +} + +uhd::_log::log::~log(void){ + if (_impl->verbosity < log_rs().level) return; + _impl->ss << std::endl; + try{ + log_rs().log_to_file(_impl->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 + ; + } +} + +std::ostream & uhd::_log::log::operator()(void){ + return _impl->ss; +} |