ringline-memcache 0.3.0

Memcache client for the ringline io_uring runtime
Documentation

ringline-memcache

ringline-native Memcache client.

A Memcache ASCII protocol client built on ringline::ConnCtx for use inside the ringline async runtime. Single-threaded, single-connection, zero-copy recv.

Quick Start

use ringline::ConnCtx;
use ringline_memcache::Client;

async fn example(conn: ConnCtx) -> Result<(), ringline_memcache::Error> {
    let mut client = Client::new(conn);
    client.set("hello", "world").await?;
    let val = client.get("hello").await?;
    assert_eq!(val.unwrap().data.as_ref(), b"world");
    Ok(())
}

Features

  • Storage commands: get, gets, set, add, replace, cas, append, prepend
  • Arithmetic: incr, decr
  • Other: delete, flush_all, version
  • Zero-copy SET: set_with_guard pins value memory via SendGuard
  • Connection pooling: round-robin pool with lazy reconnection
  • Sharded client: ketama-consistent hashing across multiple Memcache instances
  • Instrumentation: optional per-command callbacks and built-in histogram metrics

Copy Semantics

Path Copies Mechanism
Recv (values) 0 with_bytes() + ResponseBytes::parse(). Keys and values are Bytes::slice() references into the accumulator -- zero allocation, O(1) refcount.
Send (commands) 1 Serialized into Vec<u8>, then copied into the send pool.
Send (SET value, guard) 0 (value) set_with_guard: prefix+suffix copied to pool, value stays in-place via SendGuard.

TLS connections add encryption copies on the send path regardless of SendGuard usage.