LaunchDarkly Server-side SDK for Rust - Redis integration with redis client

This library provides a Redis-backed persistence mechanism (data store) for the LaunchDarkly Rust SDK, replacing the default in-memory data store.

The Redis API implementation it uses is redis. There are other Redis client implementations for Rust; if LaunchDarkly SDK Redis integrations using other Redis clients are released, they will be in separate repositories.

For more information, see also: Using a persistent feature store.

LaunchDarkly overview

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!

Quick setup

This assumes that you have already installed the LaunchDarkly Rust SDK.

1. Import the LaunchDarkly SDK packages and the package for this library:

use launchdarkly_server_sdk::{Client, ConfigBuilder, PersistentDataStoreBuilder};
use launchdarkly_server_sdk_redis::RedisPersistentDataStoreFactory;
use std::sync::Arc;

2. When configuring your SDK client, provide the ConfigBuilder with an instance of the PersistentDataStoreBuilder. You may specify any custom Redis options using the methods of RedisPersistentDataStoreFactory. For instance, to customize the Redis URL:

let mut redis_factory = RedisPersistentDataStoreFactory::new();
redis_factory.url("redis://localhost:9000");
let persistent_data_store_builder = PersistentDataStoreBuilder::new(Arc::new(redis_factory));

let mut config_builder = ConfigBuilder::new(&sdk_key);
config_builder = config_builder.data_store(&persistent_data_store_builder);

By default, the store will try to connect to a local Redis instance on port 6379.

Caching behavior

The LaunchDarkly SDK has a standard caching mechanism for any persistent data store, to reduce database traffic. This is configured through the SDK's PersistentDataStoreBuilder class as described in the SDK documentation. For instance, to specify a cache TTL of 5 minutes:

let mut persistent_data_store_builder =
    PersistentDataStoreBuilder::new(Arc::new(redis_factory));
persistent_data_store_builder.cache_time(std::time::Duration::from_secs(5 * 60));

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. Check out 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
  • launchdarkly.com/blog for the latest product updates