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Logging.h
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Logging.h
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/*
* Phusion Passenger - http://www.modrails.com/
* Copyright (c) 2010, 2011, 2012 Phusion
*
* "Phusion Passenger" is a trademark of Hongli Lai & Ninh Bui.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef _PASSENGER_LOGGING_H_
#define _PASSENGER_LOGGING_H_
#include <oxt/thread.hpp>
#include <oxt/system_calls.hpp>
#include <oxt/macros.hpp>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/file.h>
#include <sys/resource.h>
#include <unistd.h>
#include <fcntl.h>
#include <pthread.h>
#include <string>
#include <exception>
#include <stdexcept>
#include <iomanip>
#include <ostream>
#include <sstream>
#include <cstdio>
#include <ctime>
#include <cerrno>
namespace Passenger {
using namespace std;
using namespace boost;
using namespace oxt;
/********** Debug logging facilities **********/
extern int _logLevel;
extern ostream *_logStream;
int getLogLevel();
void setLogLevel(int value);
void setDebugFile(const char *logFile = NULL);
/**
* Write the given expression to the given stream.
*
* @param expr The expression to write.
* @param stream A pointer to an object that accepts the '<<' operator.
*/
#define P_LOG_TO(level, expr, stream) \
do { \
if (stream != 0 && Passenger::_logLevel >= level) { \
time_t the_time; \
struct tm the_tm; \
char datetime_buf[60]; \
struct timeval tv; \
std::stringstream sstream; \
\
the_time = time(NULL); \
localtime_r(&the_time, &the_tm); \
strftime(datetime_buf, sizeof(datetime_buf) - 1, "%F %H:%M:%S", &the_tm); \
gettimeofday(&tv, NULL); \
sstream << \
"[ pid=" << ((unsigned long) getpid()) << \
" thr=" << pthread_self() << \
" file=" << __FILE__ << ":" << (unsigned long) __LINE__ << \
" time=" << datetime_buf << "." << std::setfill('0') << std::setw(4) << \
(unsigned long) (tv.tv_usec / 100) << \
" ]: " << \
expr << std::endl; \
*stream << sstream.str(); \
stream->flush(); \
} \
} while (false)
/**
* Write the given expression to the log stream.
*/
#define P_LOG(level, expr) P_LOG_TO(level, expr, Passenger::_logStream)
/**
* Write the given expression, which represents a warning,
* to the log stream.
*/
#define P_WARN(expr) P_LOG(0, expr)
/**
* Write the given expression, which represents a warning,
* to the log stream.
*/
#define P_INFO(expr) P_LOG(0, expr)
/**
* Write the given expression, which represents an error,
* to the log stream.
*/
#define P_ERROR(expr) P_LOG(-1, expr)
/**
* Write the given expression, which represents a debugging message,
* to the log stream.
*/
#define P_DEBUG(expr) P_TRACE(1, expr)
/**
* Aborts the current process. At least on OS X, abort() unfortunately sends SIGABRT
* to a random thread, causing the original backtrace to be lost when gdb has
* detected SIGABRT. We fix that by sending SIGABRT to the calling thread.
*/
#define P_ABORT() \
do { \
P_ERROR("Aborting!"); \
sigset_t set; \
sigemptyset(&set); \
sigaddset(&set, SIGABRT); \
pthread_sigmask(SIG_UNBLOCK, &set, NULL); \
pthread_kill(pthread_self(), SIGABRT); \
abort(); \
} while (false)
#ifdef PASSENGER_DEBUG
#define P_TRACE(level, expr) P_LOG_TO(level, expr, Passenger::_logStream)
/* A version of assert() that works better. We also print the process ID, time
* and other stuff that the P_* logging functions normally print.
*/
#define P_ASSERT(expr) \
do { \
if (OXT_UNLIKELY(!(expr))) { \
P_ERROR("Assertion failed: " << #expr); \
P_ABORT(); \
} \
} while (false)
#else
#define P_TRACE(level, expr) do { /* nothing */ } while (false)
#define P_ASSERT(expr) ((void) 0)
#endif
class NotExpectingExceptions {
private:
this_thread::disable_interruption di;
this_thread::disable_syscall_interruption dsi;
const char *filename;
const char *function;
unsigned int line;
public:
NotExpectingExceptions(const char *_filename, unsigned int _line, const char *_function) {
filename = _filename;
line = _line;
function = _function;
}
~NotExpectingExceptions() {
if (std::uncaught_exception()) {
P_ERROR("Unexpected exception detected at " << filename <<
":" << line << ", function '" << function << "'!");
}
}
};
/**
* Put this in code sections where you don't expect *any* exceptions to be thrown.
* This macro will automatically disables interruptions in the current scope,
* and will print an error message whenever the scope exits with an exception.
*
* When inside critical sections, you should put this macro right after the lock
* object so that the error message is displayed before unlocking the lock;
* otherwise other threads may run before the error message is displayed, and
* those threads may see an inconsistant state and crash.
*/
#define NOT_EXPECTING_EXCEPTIONS() NotExpectingExceptions __nee(__FILE__, __LINE__, __PRETTY_FUNCTION__)
} // namespace Passenger
#endif /* _PASSENGER_LOGGING_H_ */