e81d4cea03
In some use cases it is desirable to provide a custom snapshot WASI context. Facilitate this by depending on a combination of traits required rather than concrete type in the signature. Signed-off-by: Roman Volosatovs <rvolosatovs@riseup.net>
87 lines
3.2 KiB
Rust
87 lines
3.2 KiB
Rust
//! `wasmtime-wasi` now supports using multiple snapshots to interface to the
|
|
//! same `WasiCtx`!
|
|
//!
|
|
//! `wasmtime_wasi::Wasi::new(&Store, WasiCtx)` is a struct which owns your
|
|
//! `WasiCtx` and provides linkage to every available snapshot.
|
|
//!
|
|
//! Individual snapshots are available through
|
|
//! `wasmtime_wasi::snapshots::preview_{0, 1}::Wasi::new(&Store, Rc<RefCell<WasiCtx>>)`.
|
|
|
|
pub use wasi_common::{Error, WasiCtx, WasiDir, WasiFile};
|
|
|
|
/// Re-export the commonly used wasi-cap-std-sync crate here. This saves
|
|
/// consumers of this library from having to keep additional dependencies
|
|
/// in sync.
|
|
#[cfg(feature = "sync")]
|
|
pub mod sync {
|
|
pub use wasi_cap_std_sync::*;
|
|
super::define_wasi!(block_on);
|
|
}
|
|
|
|
/// Sync mode is the "default" of this crate, so we also export it at the top
|
|
/// level.
|
|
#[cfg(feature = "sync")]
|
|
pub use sync::*;
|
|
|
|
/// Re-export the wasi-tokio crate here. This saves consumers of this library from having
|
|
/// to keep additional dependencies in sync.
|
|
#[cfg(feature = "tokio")]
|
|
pub mod tokio {
|
|
pub use wasi_tokio::*;
|
|
super::define_wasi!(async T: Send);
|
|
}
|
|
|
|
// The only difference between these definitions for sync vs async is whether
|
|
// the wasmtime::Funcs generated are async (& therefore need an async Store and an executor to run)
|
|
// or whether they have an internal "dummy executor" that expects the implementation of all
|
|
// the async funcs to poll to Ready immediately.
|
|
#[doc(hidden)]
|
|
#[macro_export]
|
|
macro_rules! define_wasi {
|
|
($async_mode:tt $($bounds:tt)*) => {
|
|
|
|
use wasmtime::Linker;
|
|
|
|
pub fn add_to_linker<T, U>(
|
|
linker: &mut Linker<T>,
|
|
get_cx: impl Fn(&mut T) -> &mut U + Send + Sync + Copy + 'static,
|
|
) -> anyhow::Result<()>
|
|
where U: Send
|
|
+ wasi_common::snapshots::preview_0::wasi_unstable::WasiUnstable
|
|
+ wasi_common::snapshots::preview_0::types::UserErrorConversion
|
|
+ wasi_common::snapshots::preview_1::wasi_snapshot_preview1::WasiSnapshotPreview1
|
|
+ wasi_common::snapshots::preview_1::types::UserErrorConversion,
|
|
$($bounds)*
|
|
{
|
|
snapshots::preview_1::add_wasi_snapshot_preview1_to_linker(linker, get_cx)?;
|
|
snapshots::preview_0::add_wasi_unstable_to_linker(linker, get_cx)?;
|
|
Ok(())
|
|
}
|
|
|
|
pub mod snapshots {
|
|
pub mod preview_1 {
|
|
wiggle::wasmtime_integration!({
|
|
// The wiggle code to integrate with lives here:
|
|
target: wasi_common::snapshots::preview_1,
|
|
// This must be the same witx document as used above. This should be ensured by
|
|
// the `WASI_ROOT` env variable, which is set in wasi-common's `build.rs`.
|
|
witx: ["$WASI_ROOT/phases/snapshot/witx/wasi_snapshot_preview1.witx"],
|
|
errors: { errno => Error },
|
|
$async_mode: *
|
|
});
|
|
}
|
|
pub mod preview_0 {
|
|
wiggle::wasmtime_integration!({
|
|
// The wiggle code to integrate with lives here:
|
|
target: wasi_common::snapshots::preview_0,
|
|
// This must be the same witx document as used above. This should be ensured by
|
|
// the `WASI_ROOT` env variable, which is set in wasi-common's `build.rs`.
|
|
witx: ["$WASI_ROOT/phases/old/snapshot_0/witx/wasi_unstable.witx"],
|
|
errors: { errno => Error },
|
|
$async_mode: *
|
|
});
|
|
}
|
|
}
|
|
}
|
|
}
|