NAME

Dir::Write::Rotate - Write files to a directory, with rotate options

VERSION

This document describes version 0.004 of Dir::Write::Rotate (from Perl distribution Dir-Write-Rotate), released on 2020-11-17.

SYNOPSIS

 use Dir::Write::Rotate;

 my $dwr = Dir::Write::Rotate->new(
     path               => 'somedir.log',            # required
     filename_pattern   => '%Y-%m-%d-%H%M%S.pid-%{pid}.%{ext}', # optional
     filename_sub       => sub { ... },              # optional
     max_size           => undef,                    # optional
     max_files          => undef,                    # optional
     max_age            => undef,                    # optional
     rotate_probability => 0.25,                     # optional
 );

 # will write to a file in the dir and return its name
 $dwr->write("some\ncontents\n");

To limit total size of files in the directory, e.g. 10MB, set max_size to 10*1024*1024. To limit number of files, e.g. 5000, set max_files to 5000. To keep only files that are at most 10 days old, set max_age to 10*24*3600.

DESCRIPTION

This module provides a simple object for writing files to directory. There are options to delete older files to keep the size of the directory in check.

METHODS

new

Syntax: $dwr = Dir::Write::Rotate->new(%args);

Constructor. Arguments:

  • path => str

    The directory path to write to. Must already exist.

  • filename_pattern => str

    Names to give to each file, expressed in pattern a la strftime()'s. Optional. Default is '%Y-%m-%d-%H%M%S.pid-%{pid}.%{ext}'. Time is expressed in local time.

    If file of the same name already exists, a suffix ".1", ".2", and so on will be appended.

    Available pattern:

    %Y - 4-digit year number, e.g. 2009
    %y - 2-digit year number, e.g. 09 for year 2009
    %m - 2-digit month, e.g. 04 for April
    %d - 2-digit day of month, e.g. 28
    %H - 2-digit hour, e.g. 01
    %M - 2-digit minute, e.g. 57
    %S - 2-digit second, e.g. 59
    %z - the time zone as hour offset from GMT
    %Z - the time zone or name or abbreviation
    %{pid} - Process ID
    %{ext} - Guessed file extension

    Try to detect appropriate file extension based on the content using File::LibMagic (if that module is available). For example, if message message looks like an HTML document, then 'html'. If File::LibMagic is not available or type cannot be detected, defaults to 'log'.

    %% - literal '%' character
  • filename_sub => code

    A more generic mechanism for filename_pattern. If filename_sub is given, filename_pattern will be ignored. The code will be called with the same arguments as log_message() and is expected to return a filename. Will die if code returns undef.

  • max_size => num

    Maximum total size of files, in bytes. After the size is surpassed, oldest files (based on ctime) will be deleted. Optional. Default is undefined, which means unlimited.

  • max_files => int

    Maximum number of files. After this number is surpassed, oldest files (based on ctime) will be deleted. Optional. Default is undefined, which means unlimited.

  • max_age => num

    Maximum age of files (based on ctime), in seconds. After the age is surpassed, files older than this age will be deleted. Optional. Default is undefined, which means unlimited.

  • rotate_probability => num

    A number between 0 and 1 which specifies the probability that write() will call rotate(). This is a balance between performance and rotate size accuracy. 1 means always rotate, 0 means never rotate. Optional. Default is 0.25.

write

Syntax: $dwr->write($msg) => $filename

Write a file with content $msg.

rotate

Will be called automatically by write.

ENVIRONMENT

DIR_WRITE_ROTATE_DEBUG

Bool. If set to true, will print debug messages to stderr (particularly when instantiated and when deleting rotated files).

HOMEPAGE

Please visit the project's homepage at https://metacpan.org/release/Dir-Write-Rotate.

SOURCE

Source repository is at https://github.com/perlancar/perl-Dir-Write-Rotate.

BUGS

Please report any bugs or feature requests on the bugtracker website https://rt.cpan.org/Public/Dist/Display.html?Name=Dir-Write-Rotate

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.

SEE ALSO

File::Write::Rotate

AUTHOR

perlancar <perlancar@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2020, 2017 by perlancar@cpan.org.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.