Haskell SDK reference

Overview

This topic documents how to get started with the Haskell SDK, and links to reference information on all of the supported features.

Getting started

Follow the steps below to get started using the LaunchDarkly SDK in your Haskell application.

The root module of the SDK LaunchDarkly.Server re-exports the entire project.

Here is an example:

import LaunchDarkly.Server
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After you import and install the SDK, create a single shared instance of Client. Specify your SDK key to authorize your application to connect to a particular environment within LaunchDarkly.

Here's how:

client :: IO Client
client = makeClient $ makeConfig "YOUR_SDK_KEY"
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You can use client to check which variation a particular user will receive for a given feature flag.

Here's how:

boolVariation client "YOUR_FLAG_KEY" (makeUser "abc") False
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Shutting down

Lastly, shut down the client when your application terminates. To learn more, read Shutting down.

Supported features

This SDK supports the following features:

• Aliasing users
• Configuration
• Evaluating flags
• Flag evaluation reasons
• Flushing events
• Getting all flags
• Identifying and changing users
• Offline mode
• Reading flags from a file
• Relay Proxy configuration
  • Using proxy mode
  • Using daemon mode
• Sending custom events
• Service endpoint configuration
• Shutting down
• Test data sources
• User configuration