LaunchDarkly SDK for Ruby
Quick setup
- Install the Ruby SDK with
gem
gem install ldclient-rb --prerelease
Note: The --prerelease
flag is there to satisfy the dependency of celluloid 0.18pre which we have tested extensively and have found stable in our use case. Unfortunately, the upstream provider has not promoted this version to stable yet. See here This is not required for use in a Gemfile.
- Require the LaunchDarkly client:
require 'ldclient-rb'
- Create a new LDClient with your SDK key:
client = LaunchDarkly::LDClient.new("your_sdk_key")
Ruby on Rails
Add
gem 'ldclient-rb'
to your Gemfile andbundle install
Initialize the launchdarkly client in
config/initializers/launchdarkly.rb
:
Rails.configuration.ld_client = LaunchDarkly::LDClient.new("your_sdk_key")
- You may want to include a function in your ApplicationController
def launchdarkly_settings
if current_user.present?
{
key: current_user.id,
anonymous: false,
email: current_user.email,
custom: { groups: current_user.groups.pluck(:name) },
# Any other fields you may have
# e.g. lastName: current_user.last_name,
}
else
if Rails::VERSION::MAJOR <= 3
hash_key = request.[:id]
else
hash_key = session.id
end
# session ids should be private to prevent session hijacking
hash_key = Digest::SHA256.base64digest hash_key
{
key: hash_key,
anonymous: true,
}
end
end
- In your controllers, access the client using
Rails.application.config.ld_client.variation('your.flag.key', launchdarkly_settings, false)
Note that this gem will automatically switch to using the Rails logger it is detected.
HTTPS proxy
The Ruby SDK uses Faraday to handle all of its network traffic. Faraday provides a built-in HTTPS proxy. If the HTTPS_PROXY environment variable is present then the SDK will proxy all network requests through the URL provided.
How to set the HTTPS_PROXY environment variable on Mac/Linux systems:
export HTTPS_PROXY=https://web-proxy.domain.com:8080
How to set the HTTPS_PROXY environment variable on Windows systems:
set HTTPS_PROXY=https://web-proxy.domain.com:8080
Your first feature flag
- Create a new feature flag on your dashboard
- In your application code, use the feature's key to check whether the flag is on for each user:
if client.variation("your.flag.key", {key: "[email protected]"}, false)
# application code to show the feature
else
# the code to run if the feature is off
end
Learn more
Check out our documentation for in-depth instructions on configuring and using LaunchDarkly. You can also head straight to the complete reference guide for this SDK.
Testing
We run integration tests for all our SDKs using a centralized test harness. This approach gives us the ability to test for consistency across SDKs, as well as test networking behavior in a long-running application. These tests cover each method in the SDK, and verify that event sending, flag evaluation, stream reconnection, and other aspects of the SDK all behave correctly.
Contributing
See Contributing
About LaunchDarkly
- LaunchDarkly is a continuous delivery platform that provides feature flags as a service and allows developers to iterate quickly and safely. We allow you to easily flag your features and manage them from the LaunchDarkly dashboard. With LaunchDarkly, you can:
- Roll out a new feature to a subset of your users (like a group of users who opt-in to a beta tester group), gathering feedback and bug reports from real-world use cases.
- Gradually roll out a feature to an increasing percentage of users, and track the effect that the feature has on key metrics (for instance, how likely is a user to complete a purchase if they have feature A versus feature B?).
- Turn off a feature that you realize is causing performance problems in production, without needing to re-deploy, or even restart the application with a changed configuration file.
- Grant access to certain features based on user attributes, like payment plan (eg: users on the ‘gold’ plan get access to more features than users in the ‘silver’ plan). Disable parts of your application to facilitate maintenance, without taking everything offline.
- LaunchDarkly provides feature flag SDKs for
- Explore LaunchDarkly
- launchdarkly.com for more information
- docs.launchdarkly.com for our documentation and SDKs
- apidocs.launchdarkly.com for our API documentation
- blog.launchdarkly.com for the latest product updates
- Feature Flagging Guide for best practices and strategies