yiisoft/composer-config-plugin

Composer plugin for config assembling

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Type:composer-plugin

0.5.1 2021-02-10 22:05 UTC

README

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Composer Config Plugin


Composer plugin for config assembling.

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This Composer plugin provides assembling of configurations distributed with composer packages. It allows putting configuration needed to use a package right inside of the package thus implementing a plugin system. The package becomes a plugin holding both the code and its configuration.

Documentation

How it works?

  • Scans installed packages for config-plugin extra option in their composer.json.
  • Loads .env files to set $_ENV variables.
  • Requires constants files to set constants.
  • Requires params files.
  • Requires config files.
  • Options collected during earlier steps could and should be used in later steps, e.g. $_ENV should be used for constants and parameters, which in turn should be used for configs.
  • File processing order is crucial to achieve expected behavior: options in root package have priority over options from included packages. It is described below in File processing order section.
  • Collected configs are written as PHP files in vendor/yiisoft/composer-config-plugin-output directory along with information needed to rebuild configs on demand.
  • Then assembled configs are ready to be loaded into application using require.

Read more about the general idea behind this plugin in English or Russian.

Installation

composer require "yiisoft/composer-config-plugin"

Out of the box this plugin supports configs in PHP and JSON formats.

To enable additional formats require:

Usage

List your config files in composer.json like the following:

"extra": {
    "config-plugin-output-dir": "path/relative-to-composer-json",
    "config-plugin": {
        "envs": "db.env",
        "params": [
            "config/params.php",
            "?config/params-local.php"
        ],
        "common": "config/common.php",
        "web": [
            "$common",
            "config/web.php"
            "../src/Modules/*/config/web.php"
        ],
        "other": "config/other.php"
    }
},

Markers

  • ? - marks optional files. Absence of files not marked with it will cause exception.

    "params": [
       "params.php",
       "?params-local.php"
    ]
    

    It's okay if params-local.php will not found, but it's not okay if params.php will be absent.

  • * - marks wildcard path. It means zero or more matches by wildcard mask.

    "web": [
       "../src/Modules/*/config/web.php"
    ]
    

    It will collect all web.php in any subfolders of src/Modules/ in config folder.

  • $ - reference to another config.

    "params": [
       "params.php",
       "?params-local.php"
    ],
    "params-console": [
       "$params",
       "params-console.php"
    ],
    "params-web": [
       "$params",
       "params-web.php"
    ]
    

    Output files params-console.php and params-web.php will contain params.php and params-local.php.

Define your configs like the following:

<?php

return [
    'components' => [
        'db' => [
            'class' => \my\Db::class,
            'name' => $params['db.name'],
            'password' => $params['db.password'],
        ],
    ],
];

A special variable $params is read from params config.

To load assembled configs in your application use require:

$config = require Yiisoft\Composer\Config\Builder::path('web');

Using sub-configs

In some cases it is convenient to extract part of your config into another file. For example, we want to extract database configuration into db.php. To do it add the config to composer.json:

"extra": {
    "config-plugin-output-dir": "path/relative-to-composer-json",
    "config-plugin": {
        "envs": "db.env",
        "params": [
            "config/params.php",
            "?config/params-local.php"
        ],
        "common": "config/common.php",
        "web": [
            "$common",
            "config/web.php"
        ],
        "other": "config/other.php",
        "db": "config/db.php"
    }
},

Create db.php:

<?php

return [
    'class' => \my\Db::class,
    'name' => $params['db.name'],
    'password' => $params['db.password'],
];

Then in the config use Builder::require():

<?php

use Yiisoft\Composer\Config\Builder;

return [
    'components' => [
        'db' => Builder::require('db'),
    ],
];

Refreshing config

Plugin uses composer POST_AUTOLOAD_DUMP event i.e. composer runs this plugin on install, update and dump-autoload commands. As the result configs are ready to be used right after package installation or update.

When you make changes to any of configs you may want to reassemble configs manually. In order to do it run:

composer dump-autoload

Above can be shortened to composer du.

If you need to force config rebuilding from your application, you can do it like the following:

// Don't do it in production, assembling takes it's time
if (getenv('APP_ENV') === 'dev') {
    Yiisoft\Composer\Config\Builder::rebuild();
}

File processing order

Config files are processed in proper order to achieve naturally expected behavior:

  • Options in outer packages override options from inner packages.
  • Plugin respects the order your configs are listed in composer.json with.
  • Different types of options are processed in the following order:
    • Environment variables from envs.
    • Constants from constants.
    • Parameters from params.
    • Configs are processed last of all.

Debugging

There are several ways to debug config building internals.

  • Plugin can show detected package dependencies hierarchy by running:
composer dump-autoload --verbose

Above can be shortened to composer du -v.

  • You can see the assembled configs in the output directory which is vendor/yiisoft/composer-config-plugin-output by default and can be configured with config-plugin-output-dir extra option in composer.json.

Known issues

This plugin treats configs as simple PHP arrays. No specific structure or semantics are expected and handled. It is simple and straightforward, but I'm in doubt... What about errors and typos? I think about adding config validation rules provided together with plugins. Will it solve all the problems?

License

This project is released under the terms of the BSD-3-Clause license. Read more here.

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