Provided by: libdbix-class-schema-config-perl_0.001011-2_all 
NAME
DBIx::Class::Schema::Config - Credential Management for DBIx::Class
DESCRIPTION
DBIx::Class::Schema::Config is a subclass of DBIx::Class::Schema that allows the loading
of credentials & configuration from a file. The actual code itself would only need to
know about the name used in the configuration file. This aims to make it simpler for
operations teams to manage database credentials.
A simple tutorial that compliments this documentation and explains converting an existing
DBIx::Class Schema to use this software to manage credentials can be found at
<http://www.symkat.com/credential-management-in-dbix-class>
SYNOPSIS
/etc/dbic.yaml
MY_DATABASE:
dsn: "dbi:Pg:host=localhost;database=blog"
user: "TheDoctor"
password: "dnoPydoleM"
TraceLevel: 1
package My::Schema
use warnings;
use strict;
use base 'DBIx::Class::Schema::Config';
__PACKAGE__->load_namespaces;
package My::Code;
use warnings;
use strict;
use My::Schema;
my $schema = My::Schema->connect('MY_DATABASE');
# arbitrary config access from anywhere in your $app
my $level = My::Schema->config->{TraceLevel};
CONFIG FILES
This module will load the files in the following order if they exist:
• $ENV{DBIX_CONFIG_DIR} . '/dbic',
$ENV{DBIX_CONFIG_DIR} can be configured at run-time, for instance:
DBIX_CONFIG_DIR="/var/local/" ./my_program.pl
• ./dbic.*
• ~/.dbic.*
• /etc/dbic.*
The files should have an extension that Config::Any recognizes, for example
/etc/dbic.yaml.
NOTE: The first available credential will be used. Therefore DATABASE in ~/.dbic.yaml
will only be looked at if it was not found in ./dbic.yaml. If there are duplicates in one
file (such that DATABASE is listed twice in ~/.dbic.yaml,) the first configuration will be
used.
CHANGE CONFIG PATH
Use "__PACKAGE__->config_paths([( '/file/stub', '/var/www/etc/dbic')]);" to change the
paths that are searched. For example:
package My::Schema
use warnings;
use strict;
use base 'DBIx::Class::Schema::Config';
__PACKAGE__->config_paths([( '/var/www/secret/dbic', '/opt/database' )]);
The above code would have /var/www/secret/dbic.* and /opt/database.* searched, in that
order. As above, the first credentials found would be used. This will replace the files
originally searched for, not add to them.
USE SPECIFIC CONFIG FILES
If you would rather explicitly state the configuration files you want loaded, you can use
the class accessor "config_files" instead.
package My::Schema
use warnings;
use strict;
use base 'DBIx::Class::Schema::Config';
__PACKAGE__->config_files([( '/var/www/secret/dbic.yaml', '/opt/database.yaml' )]);
This will check the files, "/var/www/secret/dbic.yaml", and "/opt/database.yaml" in the
same way as "config_paths", however it will only check the specific files, instead of
checking for each extension that Config::Any supports. You MUST use the extension that
corresponds to the file type you are loading. See Config::Any for information on
supported file types and extension mapping.
ACCESSING THE CONFIG FILE
The config file is stored via the "__PACKAGE__->config" accessor, which can be called as
both a class and instance method.
OVERRIDING
The API has been designed to be simple to override if you have additional needs in loading
DBIC configurations.
Overriding Connection Configuration
Simple cases where one wants to replace specific configuration tokens can be given as
extra parameters in the ->connect call.
For example, suppose we have the database MY_DATABASE from above:
MY_DATABASE:
dsn: "dbi:Pg:host=localhost;database=blog"
user: "TheDoctor"
password: "dnoPydoleM"
TraceLevel: 1
If you’d like to replace the username with “Eccleston” and we’d like to turn PrintError
off.
The following connect line would achieve this:
$Schema->connect(“MY_DATABASE”, “Eccleston”, undef, { PrintError => 0 } );
The name of the connection to load from the configuration file is still given as the first
argument, while other arguments may be given exactly as you would for any other call to
"connect".
Historical Note: This class accepts numerous ways to connect to DBIC that would otherwise
not be valid. These connection methods are discouraged but tested for and kept for
compatibility with earlier versions. For valid ways of connecting to DBIC please see
<https://metacpan.org/pod/DBIx::Class::Storage::DBI#connect_info>
filter_loaded_credentials
Override this function if you want to change the loaded credentials before they are passed
to DBIC. This is useful for use-cases that include decrypting encrypted passwords or
making programmatic changes to the configuration before using it.
sub filter_loaded_credentials {
my ( $class, $loaded_credentials, $connect_args ) = @_;
...
return $loaded_credentials;
}
$loaded_credentials is the structure after it has been loaded from the configuration file.
In this case, "$loaded_credentials->{user}" eq WalterWhite and
"$loaded_credentials->{dsn}" eq DBI:mysql:database=students;host=%s;port=3306.
$connect_args is the structure originally passed on "->connect()" after it has been turned
into a hash. For instance, "->connect('DATABASE', 'USERNAME')" will result in
"$connect_args->{dsn}" eq DATABASE and "$connect_args->{user}" eq USERNAME.
Additional parameters can be added by appending a hashref, to the connection call, as an
example, "->connect( 'CONFIG', { hostname => "db.foo.com" } );" will give $connect_args a
structure like "{ dsn => 'CONFIG', hostname => "db.foo.com" }".
For instance, if you want to use hostnames when you make the initial connection to DBIC
and are using the configuration primarily for usernames, passwords and other configuration
data, you can create a config like the following:
DATABASE:
dsn: "DBI:mysql:database=students;host=%s;port=3306"
user: "WalterWhite"
password: "relykS"
In your Schema class, you could include the following:
package My::Schema
use warnings;
use strict;
use base 'DBIx::Class::Schema::Config';
sub filter_loaded_credentials {
my ( $class, $loaded_credentials, $connect_args ) = @_;
if ( $loaded_credentials->{dsn} =~ /\%s/ ) {
$loaded_credentials->{dsn} = sprintf( $loaded_credentials->{dsn},
$connect_args->{hostname});
}
}
__PACKAGE__->load_classes;
1;
Then the connection could be done with "$Schema->connect('DATABASE', { hostname ="
'my.hostname.com' });>
See "load_credentials" for more complex changes that require changing how the
configuration itself is loaded.
load_credentials
Override this function to change the way that DBIx::Class::Schema::Config loads
credentials. The function takes the class name, as well as a hashref.
If you take the route of having "->connect('DATABASE')" used as a key for whatever
configuration you are loading, DATABASE would be "$config->{dsn}"
Some::Schema->connect(
"SomeTarget",
"Yuri",
"Yawny",
{
TraceLevel => 1
}
);
Would result in the following data structure as $config in "load_credentials($class,
$config)":
{
dsn => "SomeTarget",
user => "Yuri",
password => "Yawny",
TraceLevel => 1,
}
Currently, load_credentials will NOT be called if the first argument to "->connect()"
looks like a valid DSN. This is determined by match the DSN with "/^dbi:/i".
The function should return the same structure. For instance:
package My::Schema
use warnings;
use strict;
use base 'DBIx::Class::Schema::Config';
use LWP::Simple;
use JSON
# Load credentials from internal web server.
sub load_credentials {
my ( $class, $config ) = @_;
return decode_json(
get( "http://someserver.com/v1.0/database?key=somesecret&db=" .
$config->{dsn} ));
}
__PACKAGE__->load_classes;
AUTHOR
Kaitlyn Parkhurst (SymKat) <symkat@symkat.com> ( Blog: <http://symkat.com/> )
CONTRIBUTORS
• Matt S. Trout (mst) <mst@shadowcat.co.uk>
• Peter Rabbitson (ribasushi) <ribasushi@cpan.org>
• Christian Walde (Mihtaldu) <walde.christian@googlemail.com>
• Dagfinn Ilmari Mannsåker (ilmari) <ilmari@ilmari.org>
• Matthew Phillips (mattp) <mattp@cpan.org>
COPYRIGHT AND LICENSE
This library is free software and may be distributed under the same terms as perl itself.
AVAILABILITY
The latest version of this software is available at
<https://github.com/symkat/DBIx-Class-Schema-Config>