Calling a Rust program using Wasm

Hi Folks, Welcome to another Blog. Today, we'll learn about how to call a rust program using Wasm.
Getting Started:

1. We need rust and wasm-pack in our system, lets install them:

a. For Rust

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

b. For wasm-pack

cargo install wasm-pack

Cargo is a Rust package manager. Cargo downloads your Rust package's dependencies, compiles your packages, makes distributable packages, and uploads them to crates.io, the Rust community's package registry.

2. Create a Library, here I've named it

"ary-kaush"

cargo new --lib ary-kaush

3. Move to the library,

cd ary-kaush/

and open vs code by using code . command.

we can see that there is a folder named src and a file named cargo.toml.

4. In order to create a wasm module, we need to specify the type of package.

For adding such specification we need to modify Cargo.toml file. By adding:
a. crate type:

[lib]
crate-type = ["cdylib"]

b. dependancies:

wasm-bindgen = "0.2.78"

5. Change default code in src/lib.rs to the code that we wan't to run

here we are making a function to add two numbers.

6. Now building the package

wasm-pack build

after build, a lot of files has been created to support the package.

7. In order to run this program, run:

wasm-pack build --target nodjs

A pkg folder will be created which includes .wasm,.ts, js and .json files.

8. To run our program we need to create a index.js file and where we will make a math library.

const math  = require('./ary_kaush.js')

console.log(math.add2numbers(10,20));

In VScode

9. move in pkg by cd pkg/ and run

node index.js

and Finally we have the required output.

This was a basic program in rust, whereas we can create multiple projects e.g. a calculator, fibonacci series, to find whether the number is prime or not etc. .

Please check out blog by @moksh_pathak , where he created a calculator using Rust and ran it in Enarx.

Stay tuned for more stuff!

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