43 lines
1.3 KiB
Rust
43 lines
1.3 KiB
Rust
//! Example of instantiating of instantiating a wasm module which uses WASI
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//! imports.
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// You can execute this example with `cargo run --example wasi`
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use anyhow::Result;
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use wasmtime::*;
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use wasmtime_wasi::{sync::WasiCtxBuilder, Wasi};
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fn main() -> Result<()> {
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tracing_subscriber::FmtSubscriber::builder()
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.with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
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.with_ansi(true)
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.init();
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// Define the WASI functions globally on the `Config`.
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let mut config = Config::default();
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Wasi::add_to_config(&mut config);
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let store = Store::new(&Engine::new(&config)?);
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// Set the WASI context in the store; all instances in the store share this context.
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// `WasiCtxBuilder` provides a number of ways to configure what the target program
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// will have access to.
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assert!(Wasi::set_context(
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&store,
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WasiCtxBuilder::new()
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.inherit_stdio()
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.inherit_args()?
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.build()?
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)
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.is_ok());
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let mut linker = Linker::new(&store);
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// Instantiate our module with the imports we've created, and run it.
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let module = Module::from_file(store.engine(), "target/wasm32-wasi/debug/wasi.wasm")?;
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linker.module("", &module)?;
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linker.get_default("")?.typed::<(), ()>()?.call(())?;
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Ok(())
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}
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