nessie-backend-mem 0.3.0

In-memory ONTAP-shaped reference backend for nessie-store — PyO3 bindings.

nessie-backend-mem

The in-memory reference backend for nessie-store — a HashMap-backed implementation of the full VolumeBackend ⊂ SnapshotBackend ⊂ CloneBackend stack. It passes the full conformance suite and needs no privileges or external services, so it's the zero-dependency way to script against an ONTAP-shaped backend.

Install

pip install nessie-backend-mem      # Python
cargo add nessie-backend-mem        # Rust

Usage (Python)

from nessie_backend_mem import MemBackend

b = MemBackend()
vol = b.create_volume("build-cache", size_bytes=50 * 2**30)
snap = b.create_snapshot(vol["uuid"], "pre-build")
clone = b.create_clone(vol["uuid"], snap["uuid"], "build-cache-pr1234")
assert clone["clone"]["parent_volume"] == "build-cache"

Methods return plain dicts in the substrate-neutral domain shape (size_bytes, vol_type, clone={parent_volume, parent_snapshot}) and raise NessieError on failure. The ONTAP wire shape (size, type, clone.is_flexclone, HAL _links) is produced by nessie-ontap-protocol.

Usage (Rust)

use nessie_backend_core::{VolumeBackend, VolumeSpec};
use nessie_backend_mem::MemBackend;

let b = MemBackend::new();
let vol = b.create_volume(VolumeSpec::named("build-cache")).unwrap();

Dual-licensed MIT OR Apache-2.0.