NAME

Log::Dispatch::Configurator::Any - Configurator implementation with Config::Any

VERSION

version 1.122640

PURPOSE

Use this module in combination with Log::Dispatch::Config to allow many formats of configuration file to be loaded, via the Config::Any module.

SYNOPSIS

In the traditional Log::Dispatch::Config way:

use Log::Dispatch::Config; # loads Log::Dispatch
use Log::Dispatch::Configurator::Any;
 
my $config = Log::Dispatch::Configurator::Any->new('log.yml');
Log::Dispatch::Config->configure($config);
 
# nearby piece of code
my $log = Log::Dispatch::Config->instance;
$log->alert('Hello, world!');

Alternatively, without a config file on disk:

use Log::Dispatch::Config; # loads Log::Dispatch
use Log::Dispatch::Configurator::Any;
 
my $confhash = {
    dispatchers => ['screen]',
    screen = {
        class => 'Log::Dispatch::Screen',
        min_level => 'debug',
    },
};
 
my $config = Log::Dispatch::Configurator::Any->new($confhash);
Log::Dispatch::Config->configure($config);
 
# nearby piece of code
my $log = Log::Dispatch::Config->instance;
$log->alert('Hello, world!');

DESCRIPTION

Log::Dispatch::Config is a wrapper for Log::Dispatch and provides a way to configure Log::Dispatch objects with configuration files. Somewhat like a lite version of log4j and Log::Log4perl it allows multiple log destinations. The standard configuration file format for Log::Dispatch::Config is AppConfig.

This module plugs in to Log::Dispatch::Config and allows the use of other file formats, in fact any format supported by the Config::Any module. As a bonus you can also pass in a configuration data structure instead of a file name.

USAGE

Follow the examples in the "SYNOPSIS". If you are using an external configuration file, be aware that you are required to use a filename extension (e.g. .yml for YAML).

Below are a couple of tips and tricks you may find useful.

Fall-back default config

Being able to use a configuration data structre instead of a file on disk is handy when you want to provide application defaults which the user then replaces with their own settings. For example you could have the following:

my $defaults = {
    dispatchers => ['screen'],
    screen => {
        class     => 'Log::Dispatch::Screen',
        min_level => 'debug',
    },
};
 
my $config_file = '/etc/myapp_logging.conf';
my $config = $ENV{MYAPP_LOGGING_CONFIG} || $ARGV[0] ||
    ( -e $config_file ? $config_file : $defaults);

Log::Dispatch::Config->configure_and_watch(
    Log::Dispatch::Configurator::Any->new($config) );
my $dispatcher = Log::Dispatch::Config->instance;

With the above code, your application will check for a filename in an environment variable, then a filename as a command line argument, then check for a file on disk, and finally use its built-in defaults.

Dealing with a dispatchers list

Log::Dispatch::Config requires that a global setting dispatchers have a list value (i.e. your list of dispatchers). A few config file formats do not support list values at all, or list values at the global level (two examples being Config::Tiny and Config::General).

This module allows you to have a small grace when there is only one dispatcher in use. Write the configuration file normally, and the single-item dispatchers value will automatically be promoted to a list. In other words:

# myapp.ini
dispatchers = screen

# this becomes a config of:
$config = { dispatchers => 'screen', ... };

# so this module promotes it to:
$config = { dispatchers => ['screen'], ... };

If you want more than one dispatcher, you then need to use a config file format which supports these lists natively, I'm afraid. A good suggestion might be YAML.

THANKS

My thanks to miyagawa for writing Log::Dispatch::Config, from where I also took some tests. Also thanks to Florian Merges for his YAML Configurator, which was a useful example and saved me much time.

AUTHOR

Oliver Gorwits <oliver@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2012 by University of Oxford.

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

cpanm Log::Dispatch::Configurator::Any

perl -MCPAN -e shell
install Log::Dispatch::Configurator::Any