redis-swapplex

Redis multiplexing with reconnection notifications and MGET auto-batching

Why use this instead of redis::aio::ConnectionManager?

• Error-free reconnection behavior: when a command would otherwise fail as a consequence of the connection being dropped, this library will immediately reconnect and retry when able without producing an otherwise avoidable IoError and with subsequent reconnections debounced 1500ms
• ENV configuration simplifies kubernetes usage
• Reconnects can be observed allowing for Redis server-assisted client-side caching using client tracking redirection
• Integrated MGET auto-batching (up to 180x more performant than GET)

ENV Configuration

Composible connection urls are provided by environment variables using env-url with the REDIS prefix:

REDIS_URL=redis://127.0.0.1:6379
REDIS_HOST_ENV=MONOLITH_STAGE_REDIS_MASTER_PORT_6379_TCP_ADDR
REDIS_PORT_ENV=MONOLITH_STAGE_REDIS_MASTER_SERVICE_PORT_REDIS

Example

use redis::{AsyncCommands, RedisResult};
use redis_swapplex::get_connection;

async fn get_value(key: &str) -> RedisResult<String> {
  let mut conn = get_connection();
  conn.get(key).await
}

Runtime Configuration (optional)

For best performance, use the Tokio runtime as configured via the tokio::main or tokio::test macro with the crate attribute set to async_local while the barrier-protected-runtime feature is enabled on async-local. Doing so configures the Tokio runtime with a barrier that rendezvous runtime worker threads during shutdown in a way that ensures tasks never outlive thread local data owned by runtime worker threads and obviates the need for Box::leak as a means of lifetime extension.

Stable Usage

This crate conditionally makes use of type_alias_impl_trait and impl_trait_in_assoc_type to allow async fns in traits to be unboxed. To compile on stable the boxed feature flag can be used to downgrade async_t::async_trait to async_trait::async_trait.