WebAssembly (WASM) for High Performance Apps · Pelajaran

Membangun & Menjalankan Modul WASI

Kompilasi kode Rust dengan target WASI dan jalankan modul WebAssembly Anda di berbagai runtime WASI.

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Membangun & Menjalankan Modul WASI adalah pelajaran WebAssembly (WASM) for High Performance Apps gratis di CoddyKit. Ini adalah pelajaran 2 dari 4. Kamu bisa membaca pelajaran lengkapnya di bawah secara gratis — lalu praktikkan langsung di browser dengan editor kode bawaan dan tutor AI 24/7. Ini adalah bagian dari jalur belajar WebAssembly (WASM) for High Performance Apps, dan progresmu tersinkronisasi di web dan aplikasi CoddyKit. Kursus WebAssembly (WASM) for High Performance Apps mencakup 4 pelajaran total.

Bagian dari pelajaran ini belum diterjemahkan dan ditampilkan dalam bahasa Inggris.

Building WASI Modules

Welcome back! In the previous lesson, we learned what WASI is and its goals. Now, let's get practical.

This lesson focuses on the hands-on process of compiling Rust code to target WASI and then executing your WebAssembly modules in various WASI runtimes.

Rust for WASI Development

Rust is a prime language for WASI development due to its performance, safety features, and strong support for WebAssembly. To get started, you'll need:

Rust Toolchain: Install it via rustup if you haven't already.
WASI Target: Add the specific WASI compilation target.

rustup install stable
rustup target add wasm32-wasi

Setting Up a WASI Project

We'll use Cargo, Rust's official package manager and build system, to create a new project. This sets up the basic directory structure.

cargo new my-wasi-app
cd my-wasi-app

Our First WASI Program

Let's write a simple Rust program. For WASI, basic I/O operations like printing to the console are handled through the WASI API. Open src/main.rs and add this code:

fn main() {
    println!("Hello from WASI!");
}

WASI's Role in I/O

When you use println! in a standard Rust program, it interacts directly with the operating system. For WASI, things are a bit different.

The WASM module is sandboxed.
println! calls are routed through the WASI API.
WASI provides a standardized interface for basic system functions like console output, file access, and environment variables.

Compiling to WASI

Now, let's compile our Rust code into a WebAssembly module specifically for the WASI target. This command tells Cargo to use the wasm32-wasi target we added earlier.

cargo build --target wasm32-wasi

The WASM Module Output

After successful compilation, you'll find your WASI WebAssembly module. It's a standalone binary file, ready for execution!

Look in the target/wasm32-wasi/debug/ directory for a file named my-wasi-app.wasm. This is your compiled WASI module.

Running with Wasmtime

To execute a WASI module, you need a WASI runtime. Wasmtime is a popular, high-performance runtime designed for this purpose.

Install Wasmtime: Follow instructions on wasmtime.dev for your OS.
Run your module: Execute the .wasm file using the wasmtime command.

# Install Wasmtime (example for Linux/macOS):
curl https://wasmtime.dev/install.sh -sSf | bash

# Run your compiled module:
wasmtime target/wasm32-wasi/debug/my-wasi-app.wasm

WASI File System Access

WASI allows controlled access to the host's file system. Let's modify our Rust program to read from a file. Remember, you'll need to explicitly grant Wasmtime permission to access files.

use std::fs;
use std::io::{self, Read};

fn main() -> io::Result<()> {
    let path = "input.txt";
    let mut file = fs::File::open(path)?;
    let mut contents = String::new();
    file.read_to_string(&mut contents)?;
    println!("File content: {}", contents);
    Ok(())
}

Running with File Access

After updating src/main.rs, compile again. Then, you'll need to create an input.txt file in your project root with some content. Finally, run it with Wasmtime, granting directory access:

# Create input.txt with content (e.g., "Hello WASI File!")
# Compile again:
cargo build --target wasm32-wasi

# Run, mapping current dir to WASI root:
wasmtime --mapdir /::. target/wasm32-wasi/debug/my-wasi-app.wasm

Quick Check

Let's test your understanding of building and running WASI modules.

Jawab di pelajaran interaktif

Recap: Building & Running WASI

In this lesson, we explored the practical steps of building and running WebAssembly modules with WASI.

We set up our Rust environment for the wasm32-wasi target.
We wrote Rust code that leverages WASI for system interactions.
We compiled our code into a portable .wasm module.
We learned how to execute these modules using a WASI runtime like Wasmtime, including granting necessary permissions for host resource access.

Next, we'll delve deeper into WASI's capabilities and its implications for secure and portable applications.

Gratis untuk memulai

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Tulis dan jalankan kode asli di browser kamu, dapatkan bantuan instan dari tutor AI 24/7, dan lanjutkan di mana kamu tinggalkan di web atau aplikasi.

Kursus: 12
Pelajaran: 48

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Pertanyaan yang Sering Diajukan

Apakah pelajaran “Membangun & Menjalankan Modul WASI” gratis?

Ya — teks lengkap “Membangun & Menjalankan Modul WASI” gratis dibaca di sini di web. Untuk praktiknya secara interaktif (editor kode bawaan dan tutor AI 24/7) dan buka sisa kursus WebAssembly (WASM) for High Performance Apps, upgrade ke CoddyKit PRO. Kursus WebAssembly (WASM) for High Performance Apps mencakup 4 pelajaran total.

Apa yang akan aku pelajari di “Membangun & Menjalankan Modul WASI”?

Kompilasi kode Rust dengan target WASI dan jalankan modul WebAssembly Anda di berbagai runtime WASI. Kamu berlatih WebAssembly (WASM) for High Performance Apps dengan kode praktik yang langsung kamu jalankan di browser, dan tutor AI 24/7 menjawab pertanyaanmu saat kamu mengerjakan pelajaran ini.

Apakah aku perlu pengalaman untuk memulai WebAssembly (WASM) for High Performance Apps?

Tidak diperlukan pengalaman sebelumnya. WebAssembly (WASM) for High Performance Apps di CoddyKit dirancang untuk pemula hingga pelajar tingkat lanjut, jadi kamu bisa memulai di sini atau dari awal dan belajar sesuai kecepatan kamu sendiri. Ini adalah pelajaran 2 dari 4.

Berapa lama pelajaran “Membangun & Menjalankan Modul WASI” memakan waktu?

Sebagian besar pelajaran CoddyKit memakan waktu sekitar 5–10 menit. Setiap pelajaran ringkas dan interaktif, jadi kamu membuat kemajuan stabil dan melanjutkan dari tempat kamu tinggalkan di web dan aplikasi.

Bisakah aku menulis dan menjalankan kode dalam pelajaran WebAssembly (WASM) for High Performance Apps ini?

Ya. Setiap pelajaran WebAssembly (WASM) for High Performance Apps menyertakan editor kode bawaan, jadi kamu menulis dan menjalankan kode nyata langsung di browser dan mendapatkan umpan balik AI instan — tidak diperlukan penyiapan lokal.

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