[Rust ⭤ Node.js cloud function] communication via strings

Cargo.toml

[package]
name = "embed"
version = "0.1.0"
authors = ["Yevhen Blotskyi <yebl@boozt.com>"]
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
libc = "*"

[lib]
name = "embed"
# path = "src/main.rs"
crate-type = ["dylib"]

index.js

var ffi = require('ffi');

var lib = ffi.Library('target/release/libembed', {
  'process': ['string', ['string']]
});


const r = lib.process('Nill');
console.log('From rust:', r);

lib.rs

// src/lib.rs

extern crate libc;

use libc::c_char;
use std::ffi::CString;

#[no_mangle]
pub extern "C" fn process(name: *mut c_char) -> *mut c_char {
    let s = unsafe {
        CString::from_raw(name)
    };
    println!("Hello, {:?}", s);
    s.into_raw()
}