mirror of
https://github.com/fluencelabs/wasmer
synced 2024-12-12 22:05:33 +00:00
39 lines
1.5 KiB
Rust
39 lines
1.5 KiB
Rust
use wasmer_runtime::{func, imports, instantiate};
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use wasmer_runtime_core::vm::Ctx;
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use wasmer_wasi::generate_import_object;
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static PLUGIN_LOCATION: &'static str = "examples/plugin-for-example.wasm";
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fn it_works(_ctx: &mut Ctx) -> i32 {
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println!("Hello from outside WASI");
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5
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}
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fn main() {
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// Load the plugin data
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let wasm_bytes = std::fs::read(PLUGIN_LOCATION).expect(&format!(
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"Could not read in WASM plugin at {}",
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PLUGIN_LOCATION
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));
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// WASI imports
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let mut base_imports = generate_import_object(vec![], vec![], vec![], vec![]);
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// env is the default namespace for extern functions
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let custom_imports = imports! {
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"env" => {
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"it_works" => func!(it_works),
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},
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};
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// The WASI imports object contains all required import functions for a WASI module to run.
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// Extend this imports with our custom imports containing "it_works" function so that our custom wasm code may run.
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base_imports.extend(custom_imports);
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let instance =
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instantiate(&wasm_bytes[..], &base_imports).expect("failed to instantiate wasm module");
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// get a reference to the function "plugin_entrypoint" which takes an i32 and returns an i32
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let entry_point = instance.func::<(i32), i32>("plugin_entrypoint").unwrap();
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// call the "entry_point" function in WebAssembly with the number "2" as the i32 argument
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let result = entry_point.call(2).expect("failed to execute plugin");
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println!("result: {}", result);
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}
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