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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)
Includes modifications for which no copyright is claimed
2012, Matthias P. Braendli, matthias.braendli@mpb.li
*/
/*
This file is part of CRC-DADMOD.
CRC-DADMOD 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.
CRC-DADMOD 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 CRC-DADMOD. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _LOG_H
#define _LOG_H
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <syslog.h>
#include <fstream>
#include <sstream>
#include <iostream>
#include <list>
#include <stdexcept>
#include <string>
#include "porting.h"
#define SYSLOG_IDENT "CRC-DABMOD"
#define SYSLOG_FACILITY LOG_LOCAL0
enum log_level_t {debug = 0, info, warn, error, alert, emerg};
/** Abstract class all backends must inherit from */
class LogBackend {
public:
virtual void log(log_level_t level, std::string message) = 0;
virtual std::string get_name() = 0;
};
/** A Logging backend for Syslog */
class LogToSyslog : public LogBackend {
public:
LogToSyslog() {
name = "SYSLOG";
openlog(SYSLOG_IDENT, LOG_PID, SYSLOG_FACILITY);
}
~LogToSyslog() {
closelog();
}
void log(log_level_t level, std::string message) {
int syslog_level = LOG_EMERG;
switch (level) {
case debug: syslog_level = LOG_DEBUG; break;
case alert: syslog_level = LOG_ALERT; break;
case info: syslog_level = LOG_INFO; break;
case warn: syslog_level = LOG_WARNING; break;
case error: syslog_level = LOG_ERR; break;
case emerg: syslog_level = LOG_EMERG; break;
}
syslog(level, SYSLOG_IDENT " %s", message.c_str());
}
std::string get_name() { return name; };
private:
std::string name;
};
class LogToFile : public LogBackend {
public:
LogToFile(std::string filename) {
name = "FILE";
log_file = fopen(filename.c_str(), "a");
if (log_file == NULL) {
throw new std::runtime_error("Cannot open log file !");
}
}
~LogToFile() {
if (log_file != NULL) {
fclose(log_file);
}
}
void log(log_level_t level, std::string message) {
const char* log_level_text[] = {"DEBUG", "INFO", "WARN", "ERROR", "ALERT", "EMERG"};
// fprintf is thread-safe
fprintf(log_file, "CRC-DABMOD: %s: %s\n", log_level_text[(size_t)level], message.c_str());
fflush(log_file);
}
std::string get_name() { return name; };
private:
std::string name;
FILE* log_file;
};
class LogLine;
class Logger {
public:
Logger();
void register_backend(LogBackend* backend);
/* The LogLevel will call this when a line is complete */
void log(log_level_t level, std::string message);
/* Return a LogLine for the given level */
LogLine level(log_level_t level);
private:
std::list<LogBackend*> backends;
};
// Accumulate a line of logs, using same syntax as stringstream
class LogLine {
public:
LogLine(const LogLine& logline);
LogLine(Logger* logger, log_level_t level) :
logger_(logger)
{
level_ = level;
}
template <typename T>
LogLine& operator<<(T s) {
os << s;
return *this;
}
~LogLine()
{
logger_->log(level_, os.str());
}
private:
std::ostringstream os;
log_level_t level_;
Logger* logger_;
};
#endif
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