# ariacompute-engine (Rust)
Thin SDK over `ariacompute-inference` (and re-exports of `ariacompute-ffi` for embedding tests).
crates.io package name is `ariacompute-engine`; the Rust crate is still `aria_engine`.
```bash
cargo add ariacompute-engine
```
```rust
use aria_engine::{Engine, GenerateOpts};
let mut eng = Engine::open("/path/to/bundle")?;
let g = eng.complete("hi", &GenerateOpts { max_tokens: 16, temperature: 0.0 })?;
```
Publish: `cargo publish -p ariacompute-engine` (via [`.github/workflows/publish-cargo.yml`](../../.github/workflows/publish-cargo.yml) on GitHub Release).
## Auto-download by model name
`Engine::open_model(model_ref, &OpenOptions { token, site })` accepts either a
local bundle path or an Aria model name (e.g. `gemma-4-e2b-it_q4`). A value
containing `/` or already on disk is loaded directly; otherwise the SDK
downloads it from the regional public hub (same as `aria-engine download`:
`.com` → Hugging Face, `.cn` → ModelScope; `site` defaults to
`https://ariacompute.com`) into `~/.ariacompute/models/{model}` and loads it.
Dashboard is not used. A Dashboard `sk-` / `bfvk-` token is ignored for hub auth.
Token is optional for public models. A valid cached bundle is reused without
re-downloading.
Gated files: pass `hf_token` (`.com`) or `modelscope_api_token` (`.cn`) — same
keys as `aria-engine auth`. If omitted, the SDK reads `~/.ariacompute/config.yml`.
```rust
use aria_engine::{Engine, OpenOptions};
let mut eng = Engine::open_model("gemma-4-e2b-it_q4", &OpenOptions::default())?;
let opts = OpenOptions { hf_token: Some("hf_...".into()), ..Default::default() };
let mut gated = Engine::open_model("gemma-4-e2b-it_q4", &opts)?;
```