germania-kg/configreader

Merge default and custom configuration files with Symfony YAML. Supports CacheItemPools.

3.1.9 2022-10-24 06:15 UTC

README

Merge default and custom configuration files with Symfony YAML

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Installation

  • v2 requires PHP 7.1
  • v3.0 requires PHP 7.2+
  • v3.1 requires PHP 7.3+
$ composer require germania-kg/configreader
$ composer require germania-kg/configreader:^2.0
$ composer require germania-kg/configreader:^3.0
$ composer require germania-kg/configreader:^3.1

Interfaces

The ConfigReaderInterface requires an __invoke method which may be called with an arbitrary number of filename strings:

<?php
namespace Germania\ConfigReader;

interface ConfigReaderInterface
{
    public function __invoke( ... $files );
}

Usage

YamlConfigReader

The YamlConfigReader implemens ConfigReaderInterface. It internally uses array_replace_recursive. If the given config files do not exist, nothing happens. The return value is an array in any case.

<?php
use Germania\ConfigReader\YamlConfigReader;

$reader = new YamlConfigReader( "/path/to/configs");

// Returns array
$config = $reader("defaults.yaml", "optionals.yaml");

PSR-6 Cache support

The CacheConfigReader also implements ConfigReaderInterface and combines a ConfigReaderInterface instance with PSR-6 Cache functionality.

<?php
use Germania\ConfigReader\YamlConfigReader;
use Germania\ConfigReader\CacheConfigReader;

$reader = new YamlConfigReader( "/path/to/configs");
$cache_item_pool = ... // PSR-6 CacheItemPool
$cache_lifetime = 3600;
$logger = ...
  
$cache_reader = new CacheConfigReader($reader, $cache_item_pool, $cache_lifetime);
$cache_reader = new CacheConfigReader($reader, $cache_item_pool, $cache_lifetime, $logger);

$config = $cache_reader("defaults.yaml", "optionals.yaml");

YAML parsing options

The setYamlFlags method allows to set integer flags to be used by Symfony's YAML component. See official docs for a list of possible values: Symfony YAML component docs.

Ideas for using in config files:

  • Yaml::PARSE_CONSTANT for evaluating constants created with .env configuration
  • Yaml::PARSE_DATETIME to save work with string-to-DateTime conversion

Do not use Yaml::PARSE_OBJECT_FOR_MAP as it will break the internal array_replace_recursive call. This is a good topic for future releases.

<?php
use use Symfony\Component\Yaml\Yaml;

$reader = new YamlConfigReader( "/path/to/configs");
$reader->setYamlFlags( Yaml::PARSE_DATETIME | Yaml::PARSE_CONSTANT );

Excluding results

Given a YAML map like this:

# ignoring.yaml

# Exclude a single item:
_ignore: foo
# ... or even multiple items:
_ignore: 
  - foo
  - qux
  
foo:  bar
qux:  baz
name: john

To exclude a certain elements, use setIgnoreKey to set the name of a YAML map item that contains the keys to exclude. The result in our example will not contain neither foonor _ignore. Be careful to not overuse this feature!

$reader = new YamlConfigReader( "/path/to/configs");
$reader->setIgnoreKey( "_ignore" );
$config = $reader("ignoring.yaml");

# Will both be FALSE:
isset( $config["_ignore"])
isset( $config["foo"])

# Reset again
$reader->setIgnoreKey( null );

Exceptions

When YamlConfigReader stumbles upon a Symfony\Component\Yaml\Exception\ParseException, it will catch it and wrap it in a Germania\ConfigReader\ParseException. This class implements ConfigReaderExceptionInterface you can watch out for:

use Germania\ConfigReader\ConfigReaderExceptionInterface;
try {
	$config = $reader("defaults.yaml", "optionals.yaml");  
}
catch (ConfigReaderExceptionInterface $e)
{
  echo $e->getMessage();
}

Development

$ git clone https://github.com/GermaniaKG/ConfigReader.git
$ cd ConfigReader
$ composer install

Unit tests

Either copy phpunit.xml.dist to phpunit.xml and adapt to your needs, or leave as is. Run PhpUnit test or composer scripts like this:

$ composer test
# or
$ vendor/bin/phpunit

The test results logs are in the tests/log directory.