junobuild-satellite 0.6.0

Core implementation of a Juno Satellite.
Documentation 
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use crate::hooks::random::invoke_on_init_random_seed;
use crate::memory::state::services::with_runtime_rng_mut;
use getrandom::Error;
use ic_cdk_timers::set_timer;
use junobuild_shared::random::get_random_seed;
use rand::RngCore;
use std::time::Duration;

pub fn defer_init_random_seed() {
    set_timer(Duration::ZERO, async { init_random_seed().await });
}

pub async fn init_random_seed() {
    let seed = get_random_seed().await;

    with_runtime_rng_mut(|rng| *rng = seed);

    invoke_on_init_random_seed();
}

/// Source: https://github.com/rust-random/getrandom?tab=readme-ov-file#custom-backend
#[no_mangle]
unsafe extern "Rust" fn __getrandom_v03_custom(dest: *mut u8, len: usize) -> Result<(), Error> {
    with_runtime_rng_mut(|rng| {
        match rng {
            None => Err(Error::UNEXPECTED),
            Some(rng) => {
                let buf: &mut [u8] = unsafe {
                    // fill the buffer with zeros
                    core::ptr::write_bytes(dest, 0, len);
                    // create mutable byte slice
                    core::slice::from_raw_parts_mut(dest, len)
                };

                rng.fill_bytes(buf);
                Ok(())
            }
        }
    })
}