kevy-client

Unified KV facade for kevy — switch between in-process embedded and TCP server backends with one URL string. Pure Rust, zero crates.io runtime deps.

use kevy_client::Connection;

let mut conn = Connection::open(&std::env::var("MY_KEVY_URL").unwrap())?;
conn.set(b"hello", b"world")?;
assert_eq!(conn.get(b"hello")?, Some(b"world".to_vec()));
# Ok::<(), std::io::Error>(())

The same business code runs against any of:

Auth (redis://user:pass@…) and TLS (rediss://) are rejected up front — kevy ships without either; reach for stunnel / a proxy if you need them at the network boundary.

Install

cargo add kevy-client

Why a facade

Without this crate the typical downstream config has two parallel codepaths — one for "open an embedded Store with a path" and one for "validate a redis:// URL and open a TCP client". They share none of their setup, error handling, or test fixtures. Connection::open(url) replaces all of that with one builder.

The two backends were the kevy story anyway:

• Embedded (kevy-embedded): in-process, zero network, builds for wasm32. Use it for embedded caches and single-process apps.
• Server (kevy binary or Docker image): thread-per-core reactor + shared-nothing routing across cores + TCP RESP wire.

kevy-client ties both into one API so your app picks at runtime via environment variable / config file — develop against mem://, integration-test against file:///tmp/test, deploy against kevy://prod-cache:6379. No code change.

Command coverage (v1.2.0)

All five Redis data types plus generic-key ops, persistence, and the full pub/sub cycle. Methods on Connection:

Connection / generic: ping, dbsize, flush, type_of, exists, del, expire, persist, ttl_ms.

String: set, set_with_ttl, get, incr, incr_by.

Hash: hset, hget, hdel, hlen, hgetall, hkeys, hvals.

List: lpush, rpush, lpop, rpop, llen, lrange.

Set: sadd, srem, smembers, scard, sismember.

Sorted set: zadd, zrem, zscore, zcard, zrange.

Pub/sub: Connection::publish for the producer side. The consumer side is Subscriber — a separate type with its own dedicated TCP socket because subscribed connections cannot send normal commands per the RESP spec. Connection::publish on the embedded backend returns 0 (single-process, no subscribers); Subscriber::open on mem:// / file:// URLs returns ErrorKind::Unsupported.

use kevy_client::{Subscriber, PubsubEvent};

let mut sub = Subscriber::open("kevy://prod-cache:6379", &[b"news"])?;
loop {
    if let PubsubEvent::Message { channel, payload } = sub.recv()? {
        println!("{}: {}", String::from_utf8_lossy(&channel),
                           String::from_utf8_lossy(&payload));
    }
}
# Ok::<(), std::io::Error>(())

If you need a command this crate doesn't expose yet, drop down to the raw backend:

match &mut conn {
    kevy_client::Connection::Embedded(s) => { /* call any kevy_embedded::Store method */ }
    kevy_client::Connection::Remote(c)   => { /* call c.request(&[...]) directly */ }
}

Same code, two backends — test pattern

use kevy_client::Connection;

fn cache_smoke(c: &mut Connection) -> std::io::Result<()> {
    c.set(b"hot", b"cached")?;
    assert_eq!(c.get(b"hot")?, Some(b"cached".to_vec()));
    Ok(())
}

#[test]
fn smoke_embedded() -> std::io::Result<()> {
    cache_smoke(&mut Connection::open("mem://")?)
}

# // Run when a kevy server is up at $TEST_KEVY:
#[test]
#[ignore]   // gated on $TEST_KEVY env var pointing at a running server
fn smoke_remote() -> std::io::Result<()> {
    let url = std::env::var("TEST_KEVY").unwrap();
    cache_smoke(&mut Connection::open(&url)?)
}

License

MIT OR Apache-2.0, at your option.