How can I compress backup log files? - c++

Question

I'm using log4cplus in my project to do logging.
I created logger.conf and I will load it in the beginning of my application.
This is my logger.conf:
log4cplus.appender.Developer=log4cplus::RollingFileAppender
log4cplus.appender.Developer.DatePattern = ".yyyy-MM-dd"
log4cplus.appender.Developer.Schedule = HOURLY
log4cplus.appender.Developer.File=log/developer.log
log4cplus.appender.Developer.MaxFileSize=3MB
log4cplus.appender.Developer.MaxBackupIndex=10
log4cplus.appender.Developer.layout=log4cplus::PatternLayout
log4cplus.appender.Developer.layout.ContextPrinting=enabled
log4cplus.appender.Developer.layout.ConversionPattern=%D{%Y-%m-%d %H:%M:%S,%Q} [%t] %p - %m%n
log4cplus.appender.Developer.Threshold=TRACE
log4cplus.logger.DEVELOPER=TRACE, Developer
This is how I load my logger.conf:
QString log_path = qApp->applicationDirPath() + "/log";
QDir().mkpath(log_path);
PropertyConfigurator logger(L"configs/logger.conf", Logger::getDefaultHierarchy());
logger.configure();
And whenever I want to log, I use the following line:
Logger::getInstance(L"DEVELOPER").log(INFO_LOG_LEVEL, L"..............");
I'd like to know two things:
How can I tell Log4Cplus to compress the backup logs?
In some post I saw this reply:
I need to create my own appender, inheriting from RollingFileAppender and then add a compression steps.
If it's possible, can anyone tell me how to do it, please? I don't know how to implement this.
How can I add a pattern to the name of these backup logs?
At the moment, Log4Cplus makes my back up like this:
developer.log.1
developer.log.2
developer.log.3
...
I'd like to add date and time to it.

Answer 1

You will need to implement you own Appender like this:
class NewFileAppender : public ::log4cplus::RollingFileAppender
{
void
newFileAppender::rollover()
{
helpers::LogLog & loglog = getLogLog();
// Close the current file
out.close();
out.clear(); // reset flags since the C++ standard specified that all the
// flags should remain unchanged on a close
// If maxBackups <= 0, then there is no file renaming to be done.
if (maxBackupIndex > 0)
{
rolloverCompressedFiles(filename, maxBackupIndex);
// Rename fileName to fileName.DATE
tstring target = filename + DATE;
int ret;
ret = file_rename (filename, target);
//TODO: compress using zlib
}
}
}