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feat: add __wasm/rust-wasm-plugins-examples/

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Hatter Jiang
2025-07-12 13:22:38 +08:00
parent f2fd57c342
commit e45d14498c
19 changed files with 3195 additions and 11 deletions
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23
README.md
View File

@@ -5,7 +5,6 @@ Simple Rust Tests
Project or files:
```
.
├── README_2.md
├── __alloc
│   └── zeroizing-alloc-demo
├── __args
@@ -18,8 +17,8 @@ Project or files:
│   └── zstd-demo
├── __concurrent
│   ├── arc-swap
│   ├── async-fn-resumed-after-completion
│   ├── async_study
│   ├── async-fn-resumed-after-completion
│   ├── crossbeam_n_parking_lot
│   ├── glommio
│   ├── green-threads
@@ -78,7 +77,7 @@ Project or files:
│   └── sqlx
├── __diff
│   ├── diffy
│   └── prettydiff
│   ├── prettydiff
├── __enclave
│   └── virt_enclave
├── __err
@@ -90,9 +89,9 @@ Project or files:
├── __ffi
│   ├── abi_stable_crates
│   ├── c
│   ├── c2
│   ├── c_export
│   ├── c_layout
│   ├── c2
│   ├── calltoc
│   ├── cpp
│   ├── dotalib
@@ -103,7 +102,7 @@ Project or files:
├── __fs
│   ├── crypt4ghfs-rust
│   ├── fuse
│   └── fuser
│   ├── fuser
├── __gui
│   ├── druid
│   ├── gtk
@@ -177,8 +176,8 @@ Project or files:
│   ├── ngrok-demo
│   ├── pcap
│   ├── quinn
│   ├── rust-rawsock-demo
│   ├── rust_tcp
│   ├── rust-rawsock-demo
│   ├── s2n_quic
│   ├── socket2
│   ├── tcp
@@ -223,10 +222,10 @@ Project or files:
│   ├── sshrs
│   └── xshell
├── __shuttle
│   └── hatter-test
│   ├── hatter-test
├── __std
│   ├── async-fn
│   ├── async_await
│   ├── async-fn
│   ├── into
│   ├── iter
│   ├── misc
@@ -261,14 +260,15 @@ Project or files:
│   ├── deno_rust_wasm_qr_decode
│   ├── extism
│   ├── js-wasm
│   ├── rust-wasm-plugins-examples
│   ├── wasi
│   ├── wasm
│   ├── wasmtime
│   ├── wasmtime-serde-demo
│   └── wit-bindgen-sample
├── __web
│   ├── actix-web
│   ├── actix_rustls
│   ├── actix-web
│   ├── alibabacloundfn
│   ├── hyper_rustls
│   ├── hyperrs
@@ -282,8 +282,9 @@ Project or files:
│   ├── tide
│   └── warp
├── build_readme.rs -> scripts/build_readme_rs/src/main.rs
├── README_2.md
├── scripts
│   └── build_readme_rs
│   ├── build_readme_rs
└── single_file_tests
├── 99.rs
├── chain.rs
@@ -307,6 +308,6 @@ Project or files:
├── vec.rs
└── while.rs
279 directories, 38 files
280 directories, 38 files
```

3
__wasm/rust-wasm-plugins-examples/.gitignore vendored Normal file
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@@ -0,0 +1,3 @@
target/
work/
.cargo/

2664
__wasm/rust-wasm-plugins-examples/Cargo.lock generated Normal file
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8
__wasm/rust-wasm-plugins-examples/Cargo.toml Normal file
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@@ -0,0 +1,8 @@
[workspace]
resolver = "3"
members = ["host", "plugin"]
# This will create smaller Wasm files
[profile.release]
strip = "debuginfo"
lto = true

201
__wasm/rust-wasm-plugins-examples/LICENSE-APACHE Normal file
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@@ -0,0 +1,201 @@
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__wasm/rust-wasm-plugins-examples/LICENSE-MIT Normal file
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@@ -0,0 +1,19 @@
Copyright (c) Individual contributors
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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@@ -0,0 +1,70 @@
Rust Wasm Plugins Example
=========================
A Great Fit
-----------
You've probably heard that [Wasm](https://web.dev/explore/webassembly) (WebAssembly) can be a great way to support plugins in your application. Plugin authors can write them in any Wasm-compatible language and you're off to the races with your choice among various excellent and safe Wasm runtimes for Rust, including ones optimized for embedded environments (e.g. [wasmi](https://github.com/wasmi-labs/wasmi)).
Not So Easy
-----------
Unfortunately, you're going to find out (in early 2025, when this is written) that examples of this often-mentioned use case are hard to come by, and that so much of the documentation is irrelevant, confusing, incomplete, or just out of date, as things have been moving quite quickly in the Wasm world.
If you've read Surma's [Rust to WebAssembly the hard way](https://surma.dev/things/rust-to-webassembly/) (highly recommended starting point!) then you might feel quite confident in your ability to build `.wasm` modules, load them into Rust, call functions in them, and expose functions to them. But the hard way becomes a dead end as you realize something quite critical: Wasm only supports the transfer of just primitive numeric types, namely integers and floats (and not even unsigned integers). This is an intentional and understandable design choice to keep Wasm lean and mean and agnostic to any specific implementation.
But this means that if you want to transfer something as basic as a string or a vector then you'll have to delve deep into the the Wasm memory model.
People have come up with various solutions for Rust, from piggy-backing on [std::ffi::CString](https://doc.rust-lang.org/std/ffi/struct.CString.html) to exposing custom malloc/free functions to the Wasm module. But not only are these solutions painful, they would obviously need to be ported to every language we want to support, each with its own string and array models. There was, and still is, a need for some kind of standard, built on top of Wasm, that would support higher-level constructs in a portable way.
The Temporary Solutions
-----------------------
It took some time for the community to rally around one. For a while, a promising proposal was Wasm Interfaces (WAI). This was [pioneered by Wasmer](https://github.com/wasmerio/wai), where the [documentation](https://docs.wasmer.io/wai) still points to it as "the" solution (early 2025). As usual in the Wasm world, even that documentation can only take you so far. None of it actually mentions hosting WAI in Rust! And it only shows importing interfaces, not exporting them, though I have managed to learn how to handle exports by delving into the WAI tooling source code. The idea behind
WAI is that you describe your interface in a [`.wai` file](https://github.com/wasmerio/wai/blob/main/WAI.md) and use tooling (e.g. macros) to generate the boilerplate code for clients and hosts, a lot like how things work with RPC protocols (e.g. protobufs).
WAI had not been widely adopted, however it does work and is also quite straightforward. We won't be using it in this example, but it's useful to be aware of its existence.
Also check out [Extism](https://extism.org/), a more comprehensive attempt to fill in the gap.
The Consensus Solution
----------------------
But the consensus now seems to be around the [Wasm Component Model](https://component-model.bytecodealliance.org/), which expands on the WAI proposal with proper namespacing, resources, and richer custom data types. The Component Model is actually part of WASI, and indeed is being used to provide the WASI extensions. So, what's [WASI](https://wasi.dev/)? It's an initiative by the community to deliver a set of common APIs on top of Wasm for accessing streams, like files and stdout/stderr, network sockets, and eventually threads. I say "eventually" because WASI is still very much a work in progress. As of now (early 2025) we just got "preview 2" of it. Luckily, Rust can target "wasip2", meaning that it can be used to create the latest and greatest Components. Though, note that wasip2 does produce larger minimal `.wasm` files than WAI due to the inclusion of the machinery for the Component Model.
Like WAI, the Component Model relies on an interface definition file, [`.wit`](https://component-model.bytecodealliance.org/design/wit.html). And [Wasmtime](https://wasmtime.dev/) has the tooling for it! Yay! So, are we finally off to the races with our plugin system?
Not so fast. Again, finding examples and straightforward documentation is not easy. Wasmtime is a very comprehensive and performative implementation, but it's also designed by committee and has a lot of contributors. And due to the fast-moving nature of these things, what you find might not represent what is actually going on or what you should be using.
Finally We Get to the Point
---------------------------
All that to say, that's why I created this repository. It's intended to be a minimal and straightforward example of how to build plugins in Rust (as Components) and how to host them in your application using Wasmtime and its WIT tooling. Well, at least for early 2025... As of now it does not demonstrate the more advanced features of WIT, such as custom data types, but I might add those in the future.
How to Build and Run
--------------------
There are two crates here, a plugin, which builds into a wasip2 `.wasm`, and a host, which can be built into any Rust target architecure.
```sh
rustup target add wasm32-wasip2
git clone https://github.com/tliron/rust-wasm-plugins-examples.git
cd rust-wasm-plugins-examples
./run.sh
```
Things to See
-------------
* [Rust to WebAssembly the hard way](https://surma.dev/things/rust-to-webassembly/) by Surma
* [Plugins with Rust and WASI Preview 2](https://benw.is/posts/plugins-with-rust-and-wasi) by Ben Wishovich
License
-------
Like much of the Rust ecosystem, licensed under your choice of either of
* [Apache License, Version 2.0](LICENSE-APACHE)
* [MIT license](LICENSE-MIT)
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

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__wasm/rust-wasm-plugins-examples/assets/wit/acme-plugins.wit Normal file
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// Note that names *cannot* use underscores, but *can* use dashes
// (In Rust the dashes are converted to underscores, as usual)
// They also can't use numeric digits for some reason!
// A package can include more than one "world"
// (=component, or plugin type for us),
package acme:plugins@1.0.0;
// This is what the host will expose to our plugins
interface host {
log: func(message: string);
}
// This is what our plugins will expose to the host
interface prettify-plugin {
prettify: func(content: string) -> string;
}
// We can create additional worlds per plugin type
// You can import/export more than one interface
// (as well as individual functions, types, and resources)
world prettify {
import host;
export prettify-plugin;
}

22
__wasm/rust-wasm-plugins-examples/host/Cargo.toml Normal file
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@@ -0,0 +1,22 @@
[package]
edition = "2021"
name = "host"
description = "Rust Wasm Plugins Example"
version = "0.0.1"
rust-version = "1.84"
license = "MIT OR Apache-2.0"
repository = "https://github.com/tliron/rust-wasm-plugins-example"
documentation = "https://github.com/tliron/rust-wasm-plugins-example"
authors = ["Tal Liron"]
readme = "../README.md"
categories = ["wasm"] # https://crates.io/category_slugs
keywords = ["wasm", "wasi", "wit", "wasmtime", "examples"]
[dependencies]
anyhow = "1.0.97"
wasmtime = "31.0.0"
wasmtime-wasi = "31.0.0"

3
__wasm/rust-wasm-plugins-examples/host/src/bindings.rs Normal file
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@@ -0,0 +1,3 @@
#![allow(missing_docs)]
wasmtime::component::bindgen!(in "../assets/wit/acme-plugins.wit");

41
__wasm/rust-wasm-plugins-examples/host/src/host.rs Normal file
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@@ -0,0 +1,41 @@
use super::bindings::acme::plugins::host;
use wasmtime_wasi::{IoView, ResourceTable, WasiCtx, WasiCtxBuilder, WasiView};
//
// Host
//
/// Plugins host.
pub struct Host {
wasi: WasiCtx,
resources: ResourceTable,
}
impl Host {
/// Constructor.
pub fn new() -> Self {
let wasi = WasiCtxBuilder::new().inherit_stdout().build();
Self { wasi, resources: ResourceTable::new() }
}
}
// We need to implement WasiView for wasmtime_wasi::add_to_linker_sync
impl WasiView for Host {
fn ctx(&mut self) -> &mut WasiCtx {
&mut self.wasi
}
}
impl IoView for Host {
fn table(&mut self) -> &mut ResourceTable {
&mut self.resources
}
}
// Our exposed Host functions
impl host::Host for Host {
fn log(&mut self, message: String) {
println!("log: {}", message);
}
}

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__wasm/rust-wasm-plugins-examples/host/src/main.rs Normal file
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@@ -0,0 +1,11 @@
mod bindings;
mod host;
mod prettify;
use prettify::*;
pub fn main() {
let mut prettify = Prettify::new("target/wasm32-wasip2/release/plugin.wasm").unwrap();
let r = prettify.prettify("We will prettify this with a plugin").unwrap();
println!("{}", r);
}

55
__wasm/rust-wasm-plugins-examples/host/src/prettify.rs Normal file
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@@ -0,0 +1,55 @@
use super::{bindings, host::*};
use {
anyhow::Context,
std::path,
wasmtime::{component::*, Engine, Store},
};
//
// Prettify
//
/// Prettify plugin.
pub struct Prettify {
store: Store<Host>,
prettify: bindings::Prettify,
}
// Wasmtime uses Anyhow for most of its errors
// But you could potentially wrap it in your own "PluginError" or similar using .map_err
// For this example we used .context
impl Prettify {
/// Constructor.
pub fn new<PathT>(module: PathT) -> Result<Self, anyhow::Error>
where
PathT: AsRef<path::Path>,
{
let engine = Engine::default();
// Component
let component = Component::from_file(&engine, module).context("load component")?;
// Linker
let mut linker = Linker::new(&engine);
wasmtime_wasi::add_to_linker_sync(&mut linker).context("link WASI")?;
bindings::Prettify::add_to_linker(&mut linker, |state: &mut Host| state).context("link plugin host")?;
// Store
let mut store = Store::new(&engine, Host::new());
// Bindings
let prettify =
bindings::Prettify::instantiate(&mut store, &component, &linker).context("instantiate bindings")?;
Ok(Self { store, prettify })
}
// We'll create convenience wrappers to make calling functions ergonomic:
/// Prettify.
pub fn prettify(&mut self, name: &str) -> Result<String, anyhow::Error> {
self.prettify.acme_plugins_prettify_plugin().call_prettify(&mut self.store, name)
}
}

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__wasm/rust-wasm-plugins-examples/plugin/Cargo.toml Normal file
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@@ -0,0 +1,23 @@
[package]
edition = "2021"
name = "plugin"
description = "Rust Wasm Plugins Example"
version = "0.0.1"
rust-version = "1.84"
license = "MIT OR Apache-2.0"
repository = "https://github.com/tliron/rust-wasm-plugins-example"
documentation = "https://github.com/tliron/rust-wasm-plugins-example"
authors = ["Tal Liron"]
readme = "../README.md"
categories = ["wasm"]
keywords = ["wasm", "wasi", "wit", "wasmtime", "examples"]
[dependencies]
wit-bindgen = "0.41.0"
[lib]
crate-type = ["cdylib"]

8
__wasm/rust-wasm-plugins-examples/plugin/src/bindings.rs Normal file
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@@ -0,0 +1,8 @@
// Note that we are using the full notation of the macro in order
// to add some options that allow the bindings to live in this independent file
wit_bindgen::generate!({
path: "../assets/wit/acme-plugins.wit",
default_bindings_module: "crate::bindings",
pub_export_macro: true,
});

2
__wasm/rust-wasm-plugins-examples/plugin/src/lib.rs Normal file
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@@ -0,0 +1,2 @@
mod bindings;
mod quote_prettify;

21
__wasm/rust-wasm-plugins-examples/plugin/src/quote_prettify.rs Normal file
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@@ -0,0 +1,21 @@
use super::bindings::{acme::plugins::host, export, exports::acme::plugins::prettify_plugin};
// This is our implementation of the "prettify" plugin type
// (=WIT world)
// We shall make the content pretty by quoting all words
// Gorgeous!
pub struct QuotePrettifyPlugin;
export!(QuotePrettifyPlugin);
impl prettify_plugin::Guest for QuotePrettifyPlugin {
fn prettify(content: String) -> String {
host::log("thank you for using the quote prettify plugin!");
let words = content.split(" ");
let words: Vec<String> = words.map(|word| format!("{:?}", word)).collect();
words.join(" ")
}
}

4
__wasm/rust-wasm-plugins-examples/run.sh Executable file
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@@ -0,0 +1,4 @@
#!/bin/bash
cargo build --package=plugin --target=wasm32-wasip2 --release
cargo run --package=host

2
__wasm/rust-wasm-plugins-examples/rustfmt.toml Normal file
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@@ -0,0 +1,2 @@
max_width = 120
use_small_heuristics = "Max"