Working-ish plugin thingy

.gitignore

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+/target

Cargo.toml

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+[package]
+name = "voxa-server"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+anyhow = "1.0.99"
+wasmtime = "36.0.2"

src/lib.rs

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+pub trait Plugin {
+    fn init(&mut self);
+}
+
+#[macro_export]
+macro_rules! export_plugin {
+    ($plugin_type:ty) => {
+        static mut PLUGIN: Option<$plugin_type> = None;
+
+        #[no_mangle]
+        pub extern "C" fn init() {
+            unsafe {
+                PLUGIN = Some(<$plugin_type>::default());
+                if let Some(plugin) = PLUGIN.as_mut() {
+                    plugin.init();
+                }
+            }
+        }
+    };
+}

src/main.rs

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+use wasmtime::*;
+
+fn load_plugin(wasm_path: &str) -> anyhow::Result<()> {
+    let engine = Engine::default();
+    let mut linker = Linker::new(&engine);
+    let mut store = Store::new(&engine, ());
+
+    let module = Module::from_file(&engine, wasm_path)?;
+    let instance = linker.instantiate(&mut store, &module)?;
+
+    let init = instance.get_typed_func::<(), ()>(&mut store, "init")?;
+    init.call(&mut store, ())?;
+
+    Ok(())
+}
+
+fn main() -> anyhow::Result<()> {
+    load_plugin("plugins/test_plugin.wasm")?;
+    Ok(())
+}

test-plugin/.gitignore

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+/target

test-plugin/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "test-plugin"
+version = "0.1.0"

test-plugin/Cargo.toml

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+[package]
+name = "test-plugin"
+version = "0.1.0"
+edition = "2024"
+
+[lib]
+crate-type = ["cdylib"]

test-plugin/src/lib.rs

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+pub trait Plugin {
+    fn init(&mut self);
+}
+
+macro_rules! export_plugin {
+    ($plugin_type:ty) => {
+        static PLUGIN: std::sync::Mutex<Option<$plugin_type>> = std::sync::Mutex::new(None);
+
+        #[unsafe(no_mangle)]
+        pub extern "C" fn init() {
+            let mut plugin = PLUGIN.lock().unwrap();
+            *plugin = Some(<$plugin_type>::default());
+            if let Some(plugin) = plugin.as_mut() {
+                plugin.init();
+            }
+        }
+    };
+}
+
+#[derive(Default)]
+pub struct MyPlugin;
+
+impl Plugin for MyPlugin {
+    fn init(&mut self) {
+        println!("MyPlugin initialized!");
+    }
+}
+
+export_plugin!(MyPlugin);