Container Configurator

This package enables you to configure your application and the Dependency Injection Container (DIC) via config arrays or files. Currently, supported containers are:

Installation

Installation can be done easily using composer:

$ composer require tomphp/container-configurator

Example Usage

<?php

use League\Container\Container; // or Pimple\Container
use TomPHP\ContainerConfigurator\Configurator;

$config = [
    'db' => [
        'name'     => 'example_db',
        'username' => 'dbuser',
        'password' => 'dbpass',
    ],
    'di' => [
        'services' => [
            'database_connection' => [
                'class' => DatabaseConnection::class,
                'arguments' => [
                    'config.db.name',
                    'config.db.username',
                    'config.db.password',
                ],
            ],
        ],
    ],
];

$container = new Container();
Configurator::apply()->configFromArray($config)->to($container);

$db = $container->get('database_connection');

Reading Files From Disk

Instead of providing the config as an array, you can also provide a list of file pattern matches to the fromFiles function.

Configurator::apply()
    ->configFromFile('config_dir/config.global.php')
    ->configFromFiles('json_dir/*.json')
    ->configFromFiles('config_dir/*.local.php')
    ->to($container);

configFromFile(string $filename) reads config in from a single file.

configFromFiles(string $pattern) reads config from multiple files using globbing patterns.

Merging

The reader matches files in the order they are specified. As files are read their config is merged in; overwriting any matching keys.

Supported Formats

Currently .php and .json files are supported out of the box. PHP config files must return a PHP array.

.yaml and .yml files can be read when the package symfony/yaml is available. Run

composer require symfony/yaml

to install it.

Application Configuration

All values in the config array are made accessible via the DIC with the keys separated by a separator (default: .) and prefixed with constant string (default: config).

Example

$config = [
    'db' => [
        'name'     => 'example_db',
        'username' => 'dbuser',
        'password' => 'dbpass',
    ],
];

$container = new Container();
Configurator::apply()->configFromArray($config)->to($container);

var_dump($container->get('config.db.name'));
/*
 * OUTPUT:
 * string(10) "example_db"
 */

Accessing A Whole Sub-Array

Whole sub-arrays are also made available for cases where you want them instead of individual values.

Example

$config = [
    'db' => [
        'name'     => 'example_db',
        'username' => 'dbuser',
        'password' => 'dbpass',
    ],
];

$container = new Container();
Configurator::apply()->configFromArray($config)->to($container);

var_dump($container->get('config.db'));
/*
 * OUTPUT:
 * array(3) {
 *   ["name"]=>
 *   string(10) "example_db"
 *   ["username"]=>
 *   string(6) "dbuser"
 *   ["password"]=>
 *   string(6) "dbpass"
 * }
 */

Configuring Services

Another feature is the ability to add services to your container via the config. By default, this is done by adding a services key under a di key in the config in the following format:

$config = [
    'di' => [
        'services' => [
            'logger' => [
                'class'     => Logger::class,
                'singleton' => true,
                'arguments' => [
                    StdoutLogger::class,
                ],
                'methods'   => [
                    'setLogLevel' => [ 'info' ],
                ],
            ],
            StdoutLogger::class => [],
        ],
    ],
];

$container = new Container();
Configurator::apply()->configFromArray($config)->to($container);

$logger = $container->get('logger'));

Service Aliases

You can create an alias to another service by using the service keyword instead of class:

$config = [
    'database' => [ /* ... */ ],
    'di' => [
        'services' => [
            DatabaseConnection::class => [
                'service' => MySQLDatabaseConnection::class,
            ],
            MySQLDatabaseConnection::class => [
                'arguments' => [
                    'config.database.host',
                    'config.database.username',
                    'config.database.password',
                    'config.database.dbname',
                ],
            ],
        ],
    ],
];

Service Factories

If you require some addition additional logic when creating a service, you can define a Service Factory. A service factory is simply an invokable class which can take a list of arguments and returns the service instance.

Services are added to the container by using the factory key instead of the class key.

Example Config

$appConfig = [
    'db' => [
        'host'     => 'localhost',
        'database' => 'example_db',
        'username' => 'example_user',
        'password' => 'example_password',
    ],
    'di' => [
        'services' => [
            'database' => [
                'factory'   => MySQLPDOFactory::class,
                'singleton' => true,
                'arguments' => [
                    'config.db.host',
                    'config.db.database',
                    'config.db.username',
                    'config.db.password',
                ],
            ],
        ],
    ],
];

Example Service Factory

<?php

class MySQLPDOFactory
{
    public function __invoke($host, $database, $username, $password)
    {
        $dsn = "mysql:host=$host;dbname=$database";
        $pdo = new PDO($dsn, $username, $password);
        $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

        return $pdo;
    }
}

Injecting The Container

In the rare case that you want to inject the container in as a dependency to one of your services, you can use Configurator::container() as the name of the injected dependency. This will only work in PHP config files, it's not available with YAML or JSON.

$config = [
    'di' => [
        'services' => [
            ContainerAwareService::class => [
                'arguments' => [Configurator::container()],
            ],
        ],
    ],
];

Configuring Inflectors

It is also possible to set up Inflectors by adding an inflectors key to the di section of the config.

$appConfig = [
    'di' => [
        'inflectors' => [
            LoggerAwareInterface::class => [
                'setLogger' => ['Some\Logger']
            ],
        ],
    ],
];

Extra Settings

The behaviour of the Configurator can be adjusted by using the withSetting(string $name, $value method:

Configurator::apply()
    ->configFromFiles('*.cfg.php'),
    ->withSetting(Configurator::SETTING_PREFIX, 'settings')
    ->withSetting(Configurator::SETTING_SEPARATOR, '/')
    ->to($container);

Available settings are:

Name	Description	Default
SETTING_PREFIX	Sets prefix name for config value keys.	`config`
SETTING_SEPARATOR	Sets the separator for config key.	`.`
SETTING_SERVICES_KEY	Where the config for the services is.	`di.services`
SETTING_INFLECTORS_KEY	Where the config for the inflectors is.	`di.inflectors`
SETTING_DEFAULT_SINGLETON_SERVICES	Sets whether services are singleton by default.	`false`

Advanced Customisation

Adding A Custom File Reader

You can create your own custom file reader by implementing the TomPHP\ContainerConfigurator\FileReader\FileReader interface. Once you have created it, you can use the withFileReader(string $extension, string $readerClassName) method to enable the it.

IMPORTANT: withFileReader() must be called before calling configFromFile() or configFromFiles()!

Configurator::apply()
    ->withFileReader('.xml', MyCustomXMLFileReader::class)
    ->configFromFile('config.xml'),
    ->to($container);

Adding A Custom Container Adapter

You can create your own container adapter so that you can configure other containers. This is done by implementing the TomPHP\ContainerConfigurator\FileReader\ContainerAdapter interface. Once you have created your adapter, you can use the withContainerAdapter(string $containerName, string $adapterName) method to enable the it:

Configurator::apply()
    ->withContainerAdapter(MyContainer::class, MyContainerAdapter::class)
    ->configFromArray($appConfig),
    ->to($container);