Laika is a feature flag/feature toggle service, written in Go, that allows the creation of flags and their activation/deactivation for specific environments. This way it is possible to control in which environments each feature is available. For instance, when a new feature is developed and released, it would make sense if it was only made available, at first, in a testing or Q&A environment, and only later in production. With Laika this can be achieved by simply going to a web page, selecting the feature, and changing its status on the desired environments.

Using Laika in a project thus allows for fast and continuous feature release and deployment.

laika-php is a PHP library that handles communication with Laika's API. You can get it here.

laika-react is a React JS module that handles communication with Laika's API. You can get it here.

Laika uses CQRS, the query endpoints are as follows.

The command endpoint is for manipulating data.

Laika contains a polling HTTP client that allows to easily check for enabled/disabled features on Go code. It can be found in the client package.

$ go get -u github.com/MEDIGO/laika/client

package main

import (
	"log"

	"github.com/MEDIGO/laika/client"
)

func main() {
	c, err := client.NewClient(client.Config{
		Addr:        "127.0.0.1:8000",
		Username:    "my-username",
		Password:    "my-password",
		Environment: "prod",
	})

	if err != nil {
		log.Fatal(err)
	}

	if c.IsEnabled("my-awesome-feature", false) {
		log.Print("IT'S ALIVE!")
	} else {
		log.Print("Move along. Nothing to see here.")
	}
}

To develop Laika you need to have the following tools installed in your machine:

• Docker Compose

Build and start the docker contaniers and continuously run/build the server and UI with:

$ make develop

And start hacking!

$ open http://localhost:8000

The whole test suite can be executed with:

$ make test

The docker setup starts with a mysql database. If you would like to connect to your own database, you can pass the configuration to them with the following environment variables:

LAIKA_TEST_MYSQL_HOST=db
LAIKA_TEST_MYSQL_PORT=3306
LAIKA_TEST_MYSQL_USERNAME=root
LAIKA_TEST_MYSQL_PASSWORD=root
LAIKA_TEST_MYSQL_DBNAME=laika

In the current release of Laika, it is possible to create feature flags and enable/disable them in the existing environments.

• Specify country access (e.g. feature only enabled in Germany).
• Specify user access with percentage (e.g. feature only enabled for 30% of the user base).
• Have a field for environment creation on the web page.
• History for flag status changes.

Copyright © 2019 MEDIGO GmbH.

Laika is licensed under the MIT License. See LICENSE for the full license text.