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/*
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
Her Majesty the Queen in Right of Canada (Communications Research
Center Canada)
Copyright (C) 2018
Matthias P. Braendli, matthias.braendli@mpb.li
http://www.opendigitalradio.org
*/
/*
This file is part of ODR-DabMux.
ODR-DabMux 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.
ODR-DabMux 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 ODR-DabMux. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <syslog.h>
#include <cstdarg>
#include <cstdio>
#include <fstream>
#include <sstream>
#include <iostream>
#include <list>
#include <stdexcept>
#include <string>
#include <mutex>
#include <memory>
#define SYSLOG_IDENT "ODR-DabMux"
#define SYSLOG_FACILITY LOG_LOCAL0
enum log_level_t {debug = 0, info, warn, error, alert, emerg, discard};
static const std::string levels_as_str[] =
{ " ", " ", "WARN ", "ERROR", "ALERT", "EMERG", "-----"} ;
/** Abstract class all backends must inherit from */
class LogBackend {
public:
virtual ~LogBackend() {};
virtual void log(log_level_t level, const std::string& message) = 0;
virtual std::string get_name() const = 0;
};
/** A Logging backend for Syslog */
class LogToSyslog : public LogBackend {
public:
LogToSyslog() : name("SYSLOG") {
openlog(SYSLOG_IDENT, LOG_PID, SYSLOG_FACILITY);
}
virtual ~LogToSyslog() {
closelog();
}
void log(log_level_t level, const std::string& message);
std::string get_name() const { return name; }
private:
const std::string name;
LogToSyslog(const LogToSyslog& other) = delete;
const LogToSyslog& operator=(const LogToSyslog& other) = delete;
};
class LogToFile : public LogBackend {
public:
LogToFile(const std::string& filename);
void log(log_level_t level, const std::string& message);
std::string get_name() const { return name; }
private:
const std::string name;
struct FILEDeleter{ void operator()(FILE* fd){ if(fd) fclose(fd);}};
std::unique_ptr<FILE, FILEDeleter> log_file;
LogToFile(const LogToFile& other) = delete;
const LogToFile& operator=(const LogToFile& other) = delete;
};
class LogLine;
class Logger {
public:
void register_backend(std::shared_ptr<LogBackend> backend);
/* Log the message to all backends */
void log(log_level_t level, const char* fmt, ...);
void logstr(log_level_t level, std::string&& message);
/* Return a LogLine for the given level
* so that you can write etiLog.level(info) << "stuff = " << 21 */
LogLine level(log_level_t level);
private:
std::list<std::shared_ptr<LogBackend> > backends;
std::mutex m_cerr_mutex;
};
extern Logger etiLog;
// Accumulate a line of logs, using same syntax as stringstream
// The line is logged when the LogLine gets destroyed
class LogLine {
public:
LogLine(const LogLine& logline);
const LogLine& operator=(const LogLine& other) = delete;
LogLine(Logger* logger, log_level_t level) :
logger_(logger)
{
level_ = level;
}
// Push the new element into the stringstream
template <typename T>
LogLine& operator<<(T s) {
if (level_ != discard) {
os << s;
}
return *this;
}
~LogLine()
{
if (level_ != discard) {
logger_->logstr(level_, os.str());
}
}
private:
std::ostringstream os;
log_level_t level_;
Logger* logger_;
};
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