libcruft-util/log.cpp

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/*
* This file is part of libgim.
*
* libgim 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.
*
* libgim 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 libgim. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2012 Danny Robson <danny@nerdcruft.net>
*/
#include "log.hpp"
#include "debug.hpp"
#include "types.hpp"
#include <array>
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#include <ctime>
#include <cstring>
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#include <map>
#include <string>
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#include <boost/format.hpp>
using namespace util;
using std::string;
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using std::map;
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void
check_level (level_t l)
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{ CHECK (l >= 0 && l < NUM_LEVELS); }
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const string&
level_to_string (level_t l) {
check_level (l);
static const std::array <std::string, NUM_LEVELS> LEVEL_NAMES ({{
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"EMERGENCY",
"ALERT",
"CRITICAL",
"ERROR",
"WARN",
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"NOTICE",
"INFO",
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"DEBUG"
}});
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return LEVEL_NAMES[l];
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}
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level_t
string_to_level (const string &name) {
static const map <string, level_t> NAME_LEVELS = {
{ "EMERGENCY", EMERGENCY },
{ "ALERT", ALERT },
{ "CRITICAL", CRITICAL },
{ "ERROR", ERROR },
{ "WARN", WARN },
{ "WARNING", WARN },
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{ "NOTICE", NOTICE },
{ "INFO", INFO },
{ "INFORMATIONAL", INFO },
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{ "DEBUG", DEBUG }
};
auto pos = NAME_LEVELS.find (name);
if (pos == NAME_LEVELS.end ())
throw std::range_error (name);
return pos->second;
}
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std::ostream&
util::operator<< (std::ostream& os, level_t l) {
os << level_to_string (l);
return os;
}
void
util::log (level_t l, const std::string &format)
{ detail::log (l, boost::format (format)); }
static level_t
log_level (void) {
const char *env = getenv ("LOG_LEVEL");
if (!env)
return DEFAULT;
try {
return string_to_level (env);
} catch (...) {
return DEFAULT;
}
}
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void
util::detail::log (level_t level, boost::format &&format) {
static const level_t LOG_LEVEL = log_level ();
if (level > LOG_LEVEL)
return;
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static const boost::format LEVEL_FORMAT ("%s [%s] ");
static const size_t time_len = strlen("YYYY-mm-dd HHMMhSS") + 1;
std::string time_string (time_len, '\0');
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time_t unix_time = time (nullptr);
if (0 == strftime (&time_string[0],
time_len,
"%Y-%m-%d %H%Mh%S",
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localtime (&unix_time))) {
unusual ();
return;
}
std::cerr << boost::format (LEVEL_FORMAT)
% time_string
% level
<< format
<< std::endl;
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}