Daily log file won't save if next function is process.exit

[fliespl]

Basic example would be as follows. In this case - nothing get saved if using:

    let logger = tracer.dailyfile({
        root: 'logs',
        maxLogFiles: 30,
        logPathFormat: '{{root}}/{{date}}.log',
    });
var pool  = mysql.createPool(mysqlConfig);

pool.query('SELECT 1', function(err, data) {
    if(err) {
          logger.error(err);
          process.exit(1);
    }
});

[SufianBabri]

This is surely because the process gets killed before the log file is written.

I don't know if what you're trying to is possible by using dailyfile, but maybe if you explain your use-case, someone may suggest an alternative way of doing it.

[SufianBabri]

Alright, I get what you are trying to achieve.

What you want is a callback that could be invoked after the log file has been written, e.g. in case of uncaught exception, you want it logged and the process killed afterwards.

I don't see any way to do this at the moment. I tried to set a custom transport method but it probably gets invoked before the file is written and I wasn't able to get the file to which the data needs to be written.

This is what I came up with:

const exceptionsLogger = tracer.dailyfile({
	root: 'logs',
	allLogsFileName: 'daily-exceptions-log',
	inspectOpt: {
		showHidden: false,
		depth: null
	},
	maxLogFiles: 90,
	transport: (data: LogOutput) => {
		const filePath = path.join(data.folder, data.file);

		// the 'data' contains the path of file where I have this method
		console.log('data', data);

		// fs.appendFileSync(filePath, 'some data');
		process.exit(1);
	}
});

I think it will be good if we could set a callback to the tracer.dailyfile.

[fliespl]

Hi @SufianBabri,
thanks much.

Currently I have made a quick workaround, by just calling exit after 100ms timeout. It gives time for log to finish writing. I think that adding option to LogOutput to force writing in sync mode would resolve it.

[fliespl]

I am returning with this :)

How about allowing us to specicying callback parameter to "write" method?