112 lines
4.6 KiB
Rust
112 lines
4.6 KiB
Rust
//! `wasmtime-wasi` now supports using multiple snapshots to interface to the
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//! same `WasiCtx`!
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//!
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//! `wasmtime_wasi::Wasi::new(&Store, WasiCtx)` is a struct which owns your
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//! `WasiCtx` and provides linkage to every available snapshot.
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//!
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//! Individual snapshots are available through
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//! `wasmtime_wasi::snapshots::preview_{0, 1}::Wasi::new(&Store, Rc<RefCell<WasiCtx>>)`.
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use std::cell::RefCell;
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use std::rc::Rc;
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pub use wasi_common::{Error, WasiCtx, WasiCtxBuilder, WasiDir, WasiFile};
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use wasmtime::{Config, Linker, Store};
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/// Re-export the commonly used wasi-cap-std-sync crate here. This saves
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/// consumers of this library from having to keep additional dependencies
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/// in sync.
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#[cfg(feature = "sync")]
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pub mod sync {
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pub use wasi_cap_std_sync::*;
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}
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/// An instantiated instance of all available wasi exports. Presently includes
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/// both the "preview1" snapshot and the "unstable" (preview0) snapshot.
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pub struct Wasi {
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preview_1: snapshots::preview_1::Wasi,
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preview_0: snapshots::preview_0::Wasi,
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}
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impl Wasi {
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pub fn new(store: &Store, context: WasiCtx) -> Self {
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let context = Rc::new(RefCell::new(context));
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let preview_1 = snapshots::preview_1::Wasi::new(store, context.clone());
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let preview_0 = snapshots::preview_0::Wasi::new(store, context);
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Self {
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preview_1,
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preview_0,
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}
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}
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pub fn add_to_linker(&self, linker: &mut Linker) -> Result<(), anyhow::Error> {
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self.preview_1.add_to_linker(linker)?;
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self.preview_0.add_to_linker(linker)?;
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Ok(())
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}
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pub fn add_to_config(config: &mut Config) {
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snapshots::preview_1::Wasi::add_to_config(config);
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snapshots::preview_0::Wasi::add_to_config(config);
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}
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pub fn set_context(store: &Store, context: WasiCtx) -> Result<(), WasiCtx> {
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// It doesn't matter which underlying `Wasi` type this gets called on as the
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// implementations are identical
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snapshots::preview_1::Wasi::set_context(store, context)
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}
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}
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pub mod snapshots {
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pub mod preview_1 {
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use wasi_common::WasiCtx;
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// Defines a `struct Wasi` with member fields and appropriate APIs for dealing
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// with all the various WASI exports.
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wasmtime_wiggle::wasmtime_integration!({
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// The wiggle code to integrate with lives here:
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target: wasi_common::snapshots::preview_1,
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// This must be the same witx document as used above. This should be ensured by
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// the `WASI_ROOT` env variable, which is set in wasi-common's `build.rs`.
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witx: ["$WASI_ROOT/phases/snapshot/witx/wasi_snapshot_preview1.witx"],
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// This must be the same ctx type as used for the target:
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ctx: WasiCtx,
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// This macro will emit a struct to represent the instance,
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// with this name and docs:
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modules: { wasi_snapshot_preview1 =>
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{ name: Wasi,
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docs: "An instantiated instance of the wasi exports.
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This represents a wasi module which can be used to instantiate other wasm
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modules. This structure exports all that various fields of the wasi instance
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as fields which can be used to implement your own instantiation logic, if
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necessary. Additionally [`Wasi::get_export`] can be used to do name-based
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resolution.",
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},
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},
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});
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}
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pub mod preview_0 {
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use wasi_common::WasiCtx;
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// Defines a `struct Wasi` with member fields and appropriate APIs for dealing
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// with all the various WASI exports.
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wasmtime_wiggle::wasmtime_integration!({
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// The wiggle code to integrate with lives here:
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target: wasi_common::snapshots::preview_0,
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// This must be the same witx document as used above. This should be ensured by
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// the `WASI_ROOT` env variable, which is set in wasi-common's `build.rs`.
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witx: ["$WASI_ROOT/phases/old/snapshot_0/witx/wasi_unstable.witx"],
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// This must be the same ctx type as used for the target:
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ctx: WasiCtx,
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// This macro will emit a struct to represent the instance,
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// with this name and docs:
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modules: { wasi_unstable =>
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{ name: Wasi,
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docs: "An instantiated instance of the wasi exports.
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This represents a wasi module which can be used to instantiate other wasm
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modules. This structure exports all that various fields of the wasi instance
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as fields which can be used to implement your own instantiation logic, if
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necessary. Additionally [`Wasi::get_export`] can be used to do name-based
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resolution.",
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},
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},
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});
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}
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}
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