LaunchDarkly is a feature management platform that serves over 100 billion feature flags daily to help teams build better software, faster. Get started using LaunchDarkly today!
The SDK supports the 'latest' and 'penultimate' Go versions defined in this file.
LaunchDarkly intends to keep those versions up-to-date with the Go project's latest two releases, which represents a support period of roughly 1 year. This policy is intended to match Go's official Release Policy: each major Go release is supported until there are two newer major releases.
Additionally, a 'minimum' version is tested in CI but not officially supported. This minimum version is found in go.mod. This version may be bumped from time to time as new Go features become available that are useful to the SDK.
Refer to the SDK documentation for instructions on getting started with using the SDK.
There are two ways to specify the use of a proxy server. First, you can do it programmatically: see ldcomponents.HTTPConfiguration().
Second, Go's standard HTTP library also provides built-in support for the use of an HTTPS proxy via the HTTPS_PROXY environment variable. If this 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
If your proxy requires authentication then you can prefix the URN with your login information:
export HTTPS_PROXY=http://user:pass@web-proxy.domain.com:8080
or
set HTTPS_PROXY=http://user:pass@web-proxy.domain.com:8080
Feature flag data can be kept in a persistent store using a database integration; LaunchDarkly provides integrations for several databases, such as Redis, which are provided in separate packages. See the SDK reference guide for more information.
The SDK frequently reads and writes JSON data when it communicates with LaunchDarkly services or uses a persistent data store. By default, it uses LaunchDarkly's open-source JSON library go-jsonstream, which is considerably faster than Go's built-in encoding/json and does not depend on any third-party code. However, the SDK can optionally integrate with the third-party library easyjson, which may be even faster in some cases, without requiring any changes in your code. To enable this, set the build tag launchdarkly_easyjson when you run go build. The easyjson library is still under development and has some potential compatibility issues; see its documentation for more details.
If you do not set the launchdarkly_easyjson build tag, the SDK does not use any code from easyjson.
Read our documentation for in-depth instructions on configuring and using LaunchDarkly. You can also head straight to the complete reference guide for this SDK or our code-generated API documentation.
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.
We encourage pull requests and other contributions from the community. Check out our contributing guidelines for instructions on how to contribute to this SDK.
- 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 a wide variety of languages and technologies. Read our documentation for a complete list.
- Explore LaunchDarkly
- launchdarkly.com for more information
- docs.launchdarkly.com for our documentation and SDK reference guides
- apidocs.launchdarkly.com for our API documentation
- blog.launchdarkly.com for the latest product updates