kevy-persist

Durability for a kevy-store Store — zero-dependency, pure Rust over std::fs. Part of kevy.

Two mechanisms:

• Snapshot (RDB-style) — save_snapshot dumps a whole store to a temp file, fsyncs, then atomically renames; load_snapshot restores it. Compact, type-tagged binary format covering every value type.
• AOF (append-only file) — an Aof command log with Always / EverySec / No fsync policies; replay_aof re-applies it on startup and tolerates a truncated trailing frame from a crash mid-write.

Paired (snapshot + AOF), SAVE truncates the AOF so a reload of snapshot @ T0 plus the AOF of writes since T0 never double-applies. #![forbid(unsafe_code)].

use kevy_persist::{Aof, Fsync, replay_aof};

let path = std::env::temp_dir().join("example.aof");
let mut aof = Aof::open(&path, Fsync::No).unwrap();
aof.append(&[b"SET".to_vec(), b"k".to_vec(), b"v".to_vec()]).unwrap();
drop(aof);

let mut cmds = Vec::new();
replay_aof(&path, |args| cmds.push(args.to_vec())).unwrap();
assert_eq!(cmds.len(), 1);
# std::fs::remove_file(&path).ok();

License

Licensed under either of MIT or Apache-2.0 at your option.