1 /// Auto-generated bindings for a pre-instantiated version of a
2 /// component which implements the world `foo`.
3 ///
4 /// This structure is created through [`FooPre::new`] which
5 /// takes a [`InstancePre`](wasmtime::component::InstancePre) that
6 /// has been created through a [`Linker`](wasmtime::component::Linker).
7 ///
8 /// For more information see [`Foo`] as well.
9 pub struct FooPre<T> {
10     instance_pre: wasmtime::component::InstancePre<T>,
11     indices: FooIndices,
12 }
13 impl<T> Clone for FooPre<T> {
14     fn clone(&self) -> Self {
15         Self {
16             instance_pre: self.instance_pre.clone(),
17             indices: self.indices.clone(),
18         }
19     }
20 }
21 impl<_T> FooPre<_T> {
22     /// Creates a new copy of `FooPre` bindings which can then
23     /// be used to instantiate into a particular store.
24     ///
25     /// This method may fail if the component behind `instance_pre`
26     /// does not have the required exports.
27     pub fn new(
28         instance_pre: wasmtime::component::InstancePre<_T>,
29     ) -> wasmtime::Result<Self> {
30         let indices = FooIndices::new(instance_pre.component())?;
31         Ok(Self { instance_pre, indices })
32     }
33     pub fn engine(&self) -> &wasmtime::Engine {
34         self.instance_pre.engine()
35     }
36     pub fn instance_pre(&self) -> &wasmtime::component::InstancePre<_T> {
37         &self.instance_pre
38     }
39     /// Instantiates a new instance of [`Foo`] within the
40     /// `store` provided.
41     ///
42     /// This function will use `self` as the pre-instantiated
43     /// instance to perform instantiation. Afterwards the preloaded
44     /// indices in `self` are used to lookup all exports on the
45     /// resulting instance.
46     pub async fn instantiate_async(
47         &self,
48         mut store: impl wasmtime::AsContextMut<Data = _T>,
49     ) -> wasmtime::Result<Foo>
50     where
51         _T: Send + 'static,
52     {
53         let mut store = store.as_context_mut();
54         let instance = self.instance_pre.instantiate_async(&mut store).await?;
55         self.indices.load(&mut store, &instance)
56     }
57 }
58 /// Auto-generated bindings for index of the exports of
59 /// `foo`.
60 ///
61 /// This is an implementation detail of [`FooPre`] and can
62 /// be constructed if needed as well.
63 ///
64 /// For more information see [`Foo`] as well.
65 #[derive(Clone)]
66 pub struct FooIndices {
67     new: wasmtime::component::ComponentExportIndex,
68 }
69 /// Auto-generated bindings for an instance a component which
70 /// implements the world `foo`.
71 ///
72 /// This structure can be created through a number of means
73 /// depending on your requirements and what you have on hand:
74 ///
75 /// * The most convenient way is to use
76 ///   [`Foo::instantiate_async`] which only needs a
77 ///   [`Store`], [`Component`], and [`Linker`].
78 ///
79 /// * Alternatively you can create a [`FooPre`] ahead of
80 ///   time with a [`Component`] to front-load string lookups
81 ///   of exports once instead of per-instantiation. This
82 ///   method then uses [`FooPre::instantiate_async`] to
83 ///   create a [`Foo`].
84 ///
85 /// * If you've instantiated the instance yourself already
86 ///   then you can use [`Foo::new`].
87 ///
88 /// * You can also access the guts of instantiation through
89 ///   [`FooIndices::new_instance`] followed
90 ///   by [`FooIndices::load`] to crate an instance of this
91 ///   type.
92 ///
93 /// These methods are all equivalent to one another and move
94 /// around the tradeoff of what work is performed when.
95 ///
96 /// [`Store`]: wasmtime::Store
97 /// [`Component`]: wasmtime::component::Component
98 /// [`Linker`]: wasmtime::component::Linker
99 pub struct Foo {
100     new: wasmtime::component::Func,
101 }
102 const _: () = {
103     #[allow(unused_imports)]
104     use wasmtime::component::__internal::anyhow;
105     impl FooIndices {
106         /// Creates a new copy of `FooIndices` bindings which can then
107         /// be used to instantiate into a particular store.
108         ///
109         /// This method may fail if the component does not have the
110         /// required exports.
111         pub fn new(
112             component: &wasmtime::component::Component,
113         ) -> wasmtime::Result<Self> {
114             let _component = component;
115             let new = _component
116                 .export_index(None, "new")
117                 .ok_or_else(|| anyhow::anyhow!("no function export `new` found"))?
118                 .1;
119             Ok(FooIndices { new })
120         }
121         /// Creates a new instance of [`FooIndices`] from an
122         /// instantiated component.
123         ///
124         /// This method of creating a [`Foo`] will perform string
125         /// lookups for all exports when this method is called. This
126         /// will only succeed if the provided instance matches the
127         /// requirements of [`Foo`].
128         pub fn new_instance(
129             mut store: impl wasmtime::AsContextMut,
130             instance: &wasmtime::component::Instance,
131         ) -> wasmtime::Result<Self> {
132             let _instance = instance;
133             let new = _instance
134                 .get_export(&mut store, None, "new")
135                 .ok_or_else(|| anyhow::anyhow!("no function export `new` found"))?;
136             Ok(FooIndices { new })
137         }
138         /// Uses the indices stored in `self` to load an instance
139         /// of [`Foo`] from the instance provided.
140         ///
141         /// Note that at this time this method will additionally
142         /// perform type-checks of all exports.
143         pub fn load(
144             &self,
145             mut store: impl wasmtime::AsContextMut,
146             instance: &wasmtime::component::Instance,
147         ) -> wasmtime::Result<Foo> {
148             let _instance = instance;
149             let new = *_instance.get_typed_func::<(), ()>(&mut store, &self.new)?.func();
150             Ok(Foo { new })
151         }
152     }
153     impl Foo {
154         /// Convenience wrapper around [`FooPre::new`] and
155         /// [`FooPre::instantiate_async`].
156         pub async fn instantiate_async<_T>(
157             mut store: impl wasmtime::AsContextMut<Data = _T>,
158             component: &wasmtime::component::Component,
159             linker: &wasmtime::component::Linker<_T>,
160         ) -> wasmtime::Result<Foo>
161         where
162             _T: Send + 'static,
163         {
164             let pre = linker.instantiate_pre(component)?;
165             FooPre::new(pre)?.instantiate_async(store).await
166         }
167         /// Convenience wrapper around [`FooIndices::new_instance`] and
168         /// [`FooIndices::load`].
169         pub fn new(
170             mut store: impl wasmtime::AsContextMut,
171             instance: &wasmtime::component::Instance,
172         ) -> wasmtime::Result<Foo> {
173             let indices = FooIndices::new_instance(&mut store, instance)?;
174             indices.load(store, instance)
175         }
176         pub async fn call_new<S: wasmtime::AsContextMut>(
177             &self,
178             mut store: S,
179         ) -> wasmtime::Result<wasmtime::component::Promise<()>>
180         where
181             <S as wasmtime::AsContext>::Data: Send + 'static,
182         {
183             let callee = unsafe {
184                 wasmtime::component::TypedFunc::<(), ()>::new_unchecked(self.new)
185             };
186             let promise = callee.call_concurrent(store.as_context_mut(), ()).await?;
187             Ok(promise)
188         }
189     }
190 };
191