/// Auto-generated bindings for a pre-instantiated version of a /// component which implements the world `nope`. /// /// This structure is created through [`NopePre::new`] which /// takes a [`InstancePre`](wasmtime::component::InstancePre) that /// has been created through a [`Linker`](wasmtime::component::Linker). /// /// For more information see [`Nope`] as well. pub struct NopePre { instance_pre: wasmtime::component::InstancePre, indices: NopeIndices, } impl Clone for NopePre { fn clone(&self) -> Self { Self { instance_pre: self.instance_pre.clone(), indices: self.indices.clone(), } } } impl<_T> NopePre<_T> { /// Creates a new copy of `NopePre` 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 = NopeIndices::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 [`Nope`] 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 /// `nope`. /// /// This is an implementation detail of [`NopePre`] and can /// be constructed if needed as well. /// /// For more information see [`Nope`] as well. #[derive(Clone)] pub struct NopeIndices {} /// Auto-generated bindings for an instance a component which /// implements the world `nope`. /// /// 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 /// [`Nope::instantiate_async`] which only needs a /// [`Store`], [`Component`], and [`Linker`]. /// /// * Alternatively you can create a [`NopePre`] ahead of /// time with a [`Component`] to front-load string lookups /// of exports once instead of per-instantiation. This /// method then uses [`NopePre::instantiate_async`] to /// create a [`Nope`]. /// /// * If you've instantiated the instance yourself already /// then you can use [`Nope::new`]. /// /// * You can also access the guts of instantiation through /// [`NopeIndices::new_instance`] followed /// by [`NopeIndices::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 Nope {} const _: () = { #[allow(unused_imports)] use wasmtime::component::__internal::anyhow; impl NopeIndices { /// Creates a new copy of `NopeIndices` 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(NopeIndices {}) } /// Creates a new instance of [`NopeIndices`] from an /// instantiated component. /// /// This method of creating a [`Nope`] will perform string /// lookups for all exports when this method is called. This /// will only succeed if the provided instance matches the /// requirements of [`Nope`]. pub fn new_instance( mut store: impl wasmtime::AsContextMut, instance: &wasmtime::component::Instance, ) -> wasmtime::Result { let _instance = instance; Ok(NopeIndices {}) } /// Uses the indices stored in `self` to load an instance /// of [`Nope`] 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(Nope {}) } } impl Nope { /// Convenience wrapper around [`NopePre::new`] and /// [`NopePre::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)?; NopePre::new(pre)?.instantiate_async(store).await } /// Convenience wrapper around [`NopeIndices::new_instance`] and /// [`NopeIndices::load`]. pub fn new( mut store: impl wasmtime::AsContextMut, instance: &wasmtime::component::Instance, ) -> wasmtime::Result { let indices = NopeIndices::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::a::Host + Send, { foo::foo::a::add_to_linker(linker, get)?; Ok(()) } } }; pub mod foo { pub mod foo { #[allow(clippy::all)] pub mod a { #[allow(unused_imports)] use wasmtime::component::__internal::{anyhow, Box}; #[derive(wasmtime::component::ComponentType)] #[derive(wasmtime::component::Lift)] #[derive(wasmtime::component::Lower)] #[component(variant)] #[derive(Clone)] pub enum Error { #[component(name = "other")] Other(wasmtime::component::__internal::String), } impl core::fmt::Debug for Error { fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result { match self { Error::Other(e) => { f.debug_tuple("Error::Other").field(e).finish() } } } } impl core::fmt::Display for Error { fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result { write!(f, "{:?}", self) } } impl std::error::Error for Error {} const _: () = { assert!(12 == < Error as wasmtime::component::ComponentType >::SIZE32); assert!(4 == < Error as wasmtime::component::ComponentType >::ALIGN32); }; #[wasmtime::component::__internal::trait_variant_make(::core::marker::Send)] pub trait Host: Send { async fn g(&mut self) -> Result<(), Error>; } 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/a")?; inst.func_wrap_async( "g", move |mut caller: wasmtime::StoreContextMut<'_, T>, (): ()| { use tracing::Instrument; let span = tracing::span!( tracing::Level::TRACE, "wit-bindgen import", module = "a", function = "g", ); wasmtime::component::__internal::Box::new( async move { tracing::event!(tracing::Level::TRACE, "call"); let host = &mut host_getter(caller.data_mut()); let r = Host::g(host).await; tracing::event!( tracing::Level::TRACE, result = tracing::field::debug(& r), "return" ); Ok((r,)) } .instrument(span), ) }, )?; 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 g(&mut self) -> Result<(), Error> { Host::g(*self).await } } } } }