mORMot Open Source

mpv

Member

From: Ukraine

Registered: 2012-03-24

Posts: 1,571

Website

Force rotation in TSynLog

In pull #225 I try to implement a manual log rotation feature.

I'm plane to use it in a SIGHUP signal handler to release a log file descriptor. By Unix convention in response to SIGHUP signal daemon should reload configuration and reopen all opened files.

This is VERY useful on a big production in case we need to get a full log for a some period of time. In my case if I enable all log levels I got > 100Mb of logs per MINUTE, so having it always ON is very expensive. So I implement a SIGHUP handler what load a new logLevels form a daemon config and call TSynLog.ForceRotation to create a new log file with a new log levels.

As a side effect with a combination of custom OnRotate handler + ForceRotation we can use a Unix logrotate for complex log rotation scenarios (see short explanation why handle SIGHUP for logrotate)

Last edited by mpv (2019-07-26 10:56:36)

ab

Administrator

From: France

Registered: 2010-06-21

Posts: 14,672

Website

Re: Force rotation in TSynLog

Merged - https://synopse.info/fossil/info/bd85c14e02

edwinsn

Member

Registered: 2010-07-02

Posts: 1,218

Re: Force rotation in TSynLog

Nice feature!

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Delphi XE4 Pro on Windows 7 64bit.
Lazarus trunk built with fpcupdelux on Windows with cross-compile for Linux 64bit.