ldcommon

README

LaunchDarkly Go SDK Core Packages

Overview

This repository contains packages and types that are shared between the LaunchDarkly Go SDK and other LaunchDarkly Go components.

Applications using the LaunchDarkly Go SDK will generally use the lduser subpackage, which contains the User type, and may also use the ldvalue package, which contains the Value type that represents arbitrary JSON values. Other packages are less frequently used.

Note that the base import path is gopkg.in/launchdarkly/go-sdk-common.v2, not github.com/launchdarkly/go-sdk-common. This ensures that the package can be referenced not only as a Go module, but also by projects that use older tools like dep and govendor, because the 5.x release of the Go SDK supports either module or non-module usage. Future releases of this package, and of the Go SDK, may drop support for non-module usage.

Also, unlike go-server-sdk this does not have server in the name, because nothing in this repository is specific to the LaunchDarkly server-side model; it could be used in a client-side context.

Supported Go versions

This version of the project has been tested with Go 1.14 and higher.

Integration with easyjson

LaunchDarkly tools frequently read and write JSON data. By default, go-sdk-common 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, it 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, which both switches go-jsonstream to use easyjson internally and also generates MarshalEasyJSON/UnmarshalEasyJSON methods for each JSON-serializable type. 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, go-sdk-common does not use any code from easyjson.

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 the Go SDK, or the generated API documentation for this project.

Contributing

We encourage pull requests and other contributions from the community. Check out our contributing guidelines for instructions on how to contribute to this SDK.

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 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

Documentation

Overview

Package ldcommon is the base package for commonly used Go SDK types and functions.

Currently there are no types in this package; they are all in subpackages such as ldvalue.