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// -*- mode: c++; c-basic-offset: 2; -*-
#include "common.hh"
#ifndef _BSD_SOURCE
#define _BSD_SOURCE
#endif
#ifndef _DEFAULT_SOURCE
#define _DEFAULT_SOURCE
#endif
#include <cstdarg>
#include <cstdio>
#include <iostream>
#include <memory>
#include <syslog.h>
#include "logger.hh"
namespace {
class LoggerStdErr : public Logger {
public:
void out(Level lvl, char const* format, ...) override {
if (lvl == DBG) {
#ifdef NDEBUG
return;
#endif
}
char* tmp;
va_list args;
va_start(args, format);
auto ret = vasprintf(&tmp, format, args);
va_end(args);
if (ret == -1) return;
std::cerr << tmp << std::endl;
free(tmp);
}
};
class LoggerSyslog : public Logger {
public:
LoggerSyslog(std::string const& name)
: name_(name) {
openlog(name_.c_str(), LOG_PID, LOG_DAEMON);
}
~LoggerSyslog() override {
closelog();
}
void out(Level lvl, char const* format, ...) override {
if (lvl == DBG) {
#ifdef NDEBUG
return;
#endif
}
va_list args;
va_start(args, format);
vsyslog(lvl2prio(lvl), format, args);
va_end(args);
}
private:
static int lvl2prio(Level lvl) {
switch (lvl) {
case ERR:
return LOG_ERR;
case WARN:
return LOG_WARNING;
case INFO:
return LOG_INFO;
case DBG:
return LOG_DEBUG;
}
assert(false);
return LOG_INFO;
}
// Copy of name to keep pointer alive while syslog has access to it
std::string const name_;
};
class LoggerFile : public Logger {
public:
LoggerFile()
: fh_(nullptr) {
}
bool open(std::string const& path) {
if (fh_) fclose(fh_);
fh_ = fopen(path.c_str(), "a");
return fh_ != NULL;
}
~LoggerFile() override {
if (fh_) fclose(fh_);
}
void out(Level lvl, char const* format, ...) override {
if (lvl == DBG) {
#ifdef NDEBUG
return;
#endif
}
fputs(lvl2str(lvl), fh_);
fwrite(": ", 1, 2, fh_);
va_list args;
va_start(args, format);
vfprintf(fh_, format, args);
va_end(args);
fputc('\n', fh_);
}
private:
static char const* lvl2str(Level lvl) {
switch (lvl) {
case ERR:
return "Error";
case WARN:
return "Warning";
case INFO:
return "Info";
case DBG:
return "Debug";
}
assert(false);
return "Info";
}
FILE* fh_;
};
class NullLogger : public Logger {
public:
void out(Level, char const*, ...) override {
}
};
} // namespace
// static
Logger* Logger::create_stderr() {
return new LoggerStdErr();
}
// static
Logger* Logger::create_syslog(std::string const& name) {
return new LoggerSyslog(name);
}
// static
Logger* Logger::create_file(std::string const& path) {
std::unique_ptr<LoggerFile> ret(new LoggerFile());
if (ret->open(path)) {
return ret.release();
}
return nullptr;
}
// static
Logger* Logger::null() {
static NullLogger logger;
return &logger;
}
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