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use super::PREOPENED_DIR_NAME;
use crate::check::artifacts_dir;
use anyhow::{anyhow, Result};
use std::path::Path;
use wasmtime::component::{Component, Linker, ResourceTable};
use wasmtime::{Config, Engine, Store};
use wasmtime_wasi::bindings::sync::Command;
use wasmtime_wasi::{DirPerms, FilePerms, WasiCtx, WasiCtxBuilder};
use wasmtime_wasi_nn::wit::WasiNnView;
use wasmtime_wasi_nn::{wit::WasiNnCtx, Backend, InMemoryRegistry};
/// Run a wasi-nn test program. This is modeled after
/// `crates/wasi/tests/all/main.rs` but still uses the older preview1 API for
/// file reads.
pub fn run(path: &str, backend: Backend, preload_model: bool) -> Result<()> {
let path = Path::new(path);
let engine = Engine::new(&Config::new())?;
let mut linker = Linker::new(&engine);
wasmtime_wasi_nn::wit::add_to_linker(&mut linker, |c: &mut Ctx| {
WasiNnView::new(&mut c.table, &mut c.wasi_nn)
})?;
wasmtime_wasi::add_to_linker_sync(&mut linker)?;
let module = Component::from_file(&engine, path)?;
let mut store = Store::new(&engine, Ctx::new(&artifacts_dir(), preload_model, backend)?);
let command = Command::instantiate(&mut store, &module, &linker)?;
let result = command.wasi_cli_run().call_run(&mut store)?;
result.map_err(|_| anyhow!("failed to run command"))
}
/// The host state for running wasi-nn component tests.
struct Ctx {
wasi: WasiCtx,
wasi_nn: WasiNnCtx,
table: ResourceTable,
}
impl Ctx {
fn new(preopen_dir: &Path, preload_model: bool, mut backend: Backend) -> Result<Self> {
let mut builder = WasiCtxBuilder::new();
builder.inherit_stdio().preopened_dir(
preopen_dir,
PREOPENED_DIR_NAME,
DirPerms::READ,
FilePerms::READ,
)?;
let wasi = builder.build();
let mut registry = InMemoryRegistry::new();
let mobilenet_dir = artifacts_dir();
if preload_model {
registry.load((backend).as_dir_loadable().unwrap(), &mobilenet_dir)?;
}
let wasi_nn = WasiNnCtx::new([backend.into()], registry.into());
let table = ResourceTable::new();
Ok(Self {
wasi,
wasi_nn,
table,
})
}
}
impl wasmtime_wasi::WasiView for Ctx {
fn ctx(&mut self) -> &mut WasiCtx {
&mut self.wasi
}
fn table(&mut self) -> &mut ResourceTable {
&mut self.table
}
}
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