/// Auto-generated bindings for a pre-instantiated version of a /// component which implements the world `wasi`. /// /// This structure is created through [`WasiPre::new`] which /// takes a [`InstancePre`](wasmtime::component::InstancePre) that /// has been created through a [`Linker`](wasmtime::component::Linker). /// /// For more information see [`Wasi`] as well. pub struct WasiPre { instance_pre: wasmtime::component::InstancePre, indices: WasiIndices, } impl Clone for WasiPre { fn clone(&self) -> Self { Self { instance_pre: self.instance_pre.clone(), indices: self.indices.clone(), } } } impl<_T> WasiPre<_T> { /// Creates a new copy of `WasiPre` bindings which can then /// be used to instantiate into a particular store. /// /// This method may fail if the component behind `instance_pre` /// does not have the required exports. pub fn new( instance_pre: wasmtime::component::InstancePre<_T>, ) -> wasmtime::Result { let indices = WasiIndices::new(instance_pre.component())?; Ok(Self { instance_pre, indices }) } pub fn engine(&self) -> &wasmtime::Engine { self.instance_pre.engine() } pub fn instance_pre(&self) -> &wasmtime::component::InstancePre<_T> { &self.instance_pre } /// Instantiates a new instance of [`Wasi`] within the /// `store` provided. /// /// This function will use `self` as the pre-instantiated /// instance to perform instantiation. Afterwards the preloaded /// indices in `self` are used to lookup all exports on the /// resulting instance. pub async fn instantiate_async( &self, mut store: impl wasmtime::AsContextMut, ) -> wasmtime::Result where _T: Send, { let mut store = store.as_context_mut(); let instance = self.instance_pre.instantiate_async(&mut store).await?; self.indices.load(&mut store, &instance) } } /// Auto-generated bindings for index of the exports of /// `wasi`. /// /// This is an implementation detail of [`WasiPre`] and can /// be constructed if needed as well. /// /// For more information see [`Wasi`] as well. #[derive(Clone)] pub struct WasiIndices {} /// Auto-generated bindings for an instance a component which /// implements the world `wasi`. /// /// This structure can be created through a number of means /// depending on your requirements and what you have on hand: /// /// * The most convenient way is to use /// [`Wasi::instantiate_async`] which only needs a /// [`Store`], [`Component`], and [`Linker`]. /// /// * Alternatively you can create a [`WasiPre`] ahead of /// time with a [`Component`] to front-load string lookups /// of exports once instead of per-instantiation. This /// method then uses [`WasiPre::instantiate_async`] to /// create a [`Wasi`]. /// /// * If you've instantiated the instance yourself already /// then you can use [`Wasi::new`]. /// /// * You can also access the guts of instantiation through /// [`WasiIndices::new_instance`] followed /// by [`WasiIndices::load`] to crate an instance of this /// type. /// /// These methods are all equivalent to one another and move /// around the tradeoff of what work is performed when. /// /// [`Store`]: wasmtime::Store /// [`Component`]: wasmtime::component::Component /// [`Linker`]: wasmtime::component::Linker pub struct Wasi {} const _: () = { #[allow(unused_imports)] use wasmtime::component::__internal::anyhow; impl WasiIndices { /// Creates a new copy of `WasiIndices` bindings which can then /// be used to instantiate into a particular store. /// /// This method may fail if the component does not have the /// required exports. pub fn new( component: &wasmtime::component::Component, ) -> wasmtime::Result { let _component = component; Ok(WasiIndices {}) } /// Creates a new instance of [`WasiIndices`] from an /// instantiated component. /// /// This method of creating a [`Wasi`] will perform string /// lookups for all exports when this method is called. This /// will only succeed if the provided instance matches the /// requirements of [`Wasi`]. pub fn new_instance( mut store: impl wasmtime::AsContextMut, instance: &wasmtime::component::Instance, ) -> wasmtime::Result { let _instance = instance; Ok(WasiIndices {}) } /// Uses the indices stored in `self` to load an instance /// of [`Wasi`] from the instance provided. /// /// Note that at this time this method will additionally /// perform type-checks of all exports. pub fn load( &self, mut store: impl wasmtime::AsContextMut, instance: &wasmtime::component::Instance, ) -> wasmtime::Result { let _instance = instance; Ok(Wasi {}) } } impl Wasi { /// Convenience wrapper around [`WasiPre::new`] and /// [`WasiPre::instantiate_async`]. pub async fn instantiate_async<_T>( mut store: impl wasmtime::AsContextMut, component: &wasmtime::component::Component, linker: &wasmtime::component::Linker<_T>, ) -> wasmtime::Result where _T: Send, { let pre = linker.instantiate_pre(component)?; WasiPre::new(pre)?.instantiate_async(store).await } /// Convenience wrapper around [`WasiIndices::new_instance`] and /// [`WasiIndices::load`]. pub fn new( mut store: impl wasmtime::AsContextMut, instance: &wasmtime::component::Instance, ) -> wasmtime::Result { let indices = WasiIndices::new_instance(&mut store, instance)?; indices.load(store, instance) } pub fn add_to_linker( linker: &mut wasmtime::component::Linker, get: impl Fn(&mut T) -> &mut U + Send + Sync + Copy + 'static, ) -> wasmtime::Result<()> where T: Send, U: foo::foo::wasi_filesystem::Host + foo::foo::wall_clock::Host + Send, { foo::foo::wasi_filesystem::add_to_linker(linker, get)?; foo::foo::wall_clock::add_to_linker(linker, get)?; Ok(()) } } }; pub mod foo { pub mod foo { #[allow(clippy::all)] pub mod wasi_filesystem { #[allow(unused_imports)] use wasmtime::component::__internal::{anyhow, Box}; #[derive(wasmtime::component::ComponentType)] #[derive(wasmtime::component::Lift)] #[derive(wasmtime::component::Lower)] #[component(record)] #[derive(Clone, Copy)] pub struct DescriptorStat {} impl core::fmt::Debug for DescriptorStat { fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result { f.debug_struct("DescriptorStat").finish() } } const _: () = { assert!( 0 == < DescriptorStat as wasmtime::component::ComponentType >::SIZE32 ); assert!( 1 == < DescriptorStat as wasmtime::component::ComponentType >::ALIGN32 ); }; #[derive(wasmtime::component::ComponentType)] #[derive(wasmtime::component::Lift)] #[derive(wasmtime::component::Lower)] #[component(enum)] #[derive(Clone, Copy, Eq, PartialEq)] #[repr(u8)] pub enum Errno { #[component(name = "e")] E, } impl Errno { pub fn name(&self) -> &'static str { match self { Errno::E => "e", } } pub fn message(&self) -> &'static str { match self { Errno::E => "", } } } impl core::fmt::Debug for Errno { fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result { f.debug_struct("Errno") .field("code", &(*self as i32)) .field("name", &self.name()) .field("message", &self.message()) .finish() } } impl core::fmt::Display for Errno { fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result { write!(f, "{} (error {})", self.name(), * self as i32) } } impl std::error::Error for Errno {} const _: () = { assert!(1 == < Errno as wasmtime::component::ComponentType >::SIZE32); assert!(1 == < Errno as wasmtime::component::ComponentType >::ALIGN32); }; #[wasmtime::component::__internal::trait_variant_make(::core::marker::Send)] pub trait Host: Send { async fn create_directory_at(&mut self) -> Result<(), Errno>; async fn stat(&mut self) -> Result; } pub trait GetHost< T, >: Fn(T) -> >::Host + Send + Sync + Copy + 'static { type Host: Host + Send; } impl GetHost for F where F: Fn(T) -> O + Send + Sync + Copy + 'static, O: Host + Send, { type Host = O; } pub fn add_to_linker_get_host( linker: &mut wasmtime::component::Linker, host_getter: impl for<'a> GetHost<&'a mut T>, ) -> wasmtime::Result<()> where T: Send, { let mut inst = linker.instance("foo:foo/wasi-filesystem")?; inst.func_wrap_async( "create-directory-at", move |mut caller: wasmtime::StoreContextMut<'_, T>, (): ()| { wasmtime::component::__internal::Box::new(async move { let host = &mut host_getter(caller.data_mut()); let r = Host::create_directory_at(host).await; Ok((r,)) }) }, )?; inst.func_wrap_async( "stat", move |mut caller: wasmtime::StoreContextMut<'_, T>, (): ()| { wasmtime::component::__internal::Box::new(async move { let host = &mut host_getter(caller.data_mut()); let r = Host::stat(host).await; Ok((r,)) }) }, )?; Ok(()) } pub fn add_to_linker( linker: &mut wasmtime::component::Linker, get: impl Fn(&mut T) -> &mut U + Send + Sync + Copy + 'static, ) -> wasmtime::Result<()> where U: Host + Send, T: Send, { add_to_linker_get_host(linker, get) } impl<_T: Host + ?Sized + Send> Host for &mut _T { async fn create_directory_at(&mut self) -> Result<(), Errno> { Host::create_directory_at(*self).await } async fn stat(&mut self) -> Result { Host::stat(*self).await } } } #[allow(clippy::all)] pub mod wall_clock { #[allow(unused_imports)] use wasmtime::component::__internal::{anyhow, Box}; #[wasmtime::component::__internal::trait_variant_make(::core::marker::Send)] pub trait Host: Send {} pub trait GetHost< T, >: Fn(T) -> >::Host + Send + Sync + Copy + 'static { type Host: Host + Send; } impl GetHost for F where F: Fn(T) -> O + Send + Sync + Copy + 'static, O: Host + Send, { type Host = O; } pub fn add_to_linker_get_host( linker: &mut wasmtime::component::Linker, host_getter: impl for<'a> GetHost<&'a mut T>, ) -> wasmtime::Result<()> where T: Send, { let mut inst = linker.instance("foo:foo/wall-clock")?; Ok(()) } pub fn add_to_linker( linker: &mut wasmtime::component::Linker, get: impl Fn(&mut T) -> &mut U + Send + Sync + Copy + 'static, ) -> wasmtime::Result<()> where U: Host + Send, T: Send, { add_to_linker_get_host(linker, get) } impl<_T: Host + ?Sized + Send> Host for &mut _T {} } } }