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Informations about the package feature-toggles

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trompette/feature-toggles

This PHP library implements a feature toggle infrastructure.

Using trompette/feature-toggles library can help a team to deliver new features to users iteratively and safely, in other words: it enables continuous deployment.

For more information on the topic, see Feature Toggles (aka Feature Flags) on MartinFowler.com.

Installation

The trompette/feature-toggles library is distributed on Packagist.

It can be added as a project dependency with the following command:

Standalone usage

When working on a new version of a page, deploying gradually the new version can bring a lot of confidence to a team.

But it also brings more work, as the team needs to:

With trompette/feature-toggles library, enabling the new version is done by asking the toggle router if the current user has a feature:

Feature registry

Before using the toggle router, new_page_version feature has to be registered:

Toggling strategies

When defining a feature, a toggling strategy has to be referenced to specify the algorithm deciding if a target has a feature.

Implemented strategies are:

And strategies can be combined with boolean operators, like so: onoff and whitelist, onoff or whitelist or percentage, etc.

Toggle router

Now that the feature registry is configured, the toggle router can be created:

Strategies are injected as an array indexed with names: these are the references that should be used when registering features.

Feature configuration

The toggle router can be used to configure a feature for a given strategy:

Configuration changes are persisted by calling the associated method on the strategy instance.

All Doctrine DBAL configuration repositories can migrate a schema, since they all implement the SchemaMigrator interface:

Usage with Symfony

All previous code is optional when using Symfony: everything is glued together by the FeatureTogglesBundle class.

Registering the bundle in config/bundles.php is needed to benefit from the Symfony integration:

Bundle configuration

The bundle can be configured as described by config:dump-reference:

For technical details, see FeatureTogglesConfiguration class.

Container services

There is only one service declared as public: the toggle router with Trompette\FeatureToggles\ToggleRouter or Trompette\FeatureToggles\ToggleRouterInterface as identifier.

There are also useful console commands defined as services and tagged with console.command:

More information about the commands can be found in their help messages.

For technical details, see FeatureTogglesExtension class.

License

The trompette/feature-toggles library is released under the MIT License.

See the LICENSE file for more details.

Acknowledgments

The trompette/feature-toggles library is inspired by a practice and a tool used by the Food Assembly development team.

The team discovered the practice with the article Web Experimentation with New Visitors on Etsy's Engineering Blog.

All versions of feature-toggles with dependencies

PHP Build Version
Package Version
Requires php Version >=8.1
beberlei/assert Version >=3.2
doctrine/dbal Version >=3.8
psr/log Version >=1.1
symfony/config Version >=5.4
symfony/console Version >=5.4
symfony/expression-language Version >=5.4
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