//! Mesh networking heartbeat and simple neighbor tracking.

use rand::{distributions::Alphanumeric, Rng};
use serde::Serialize;
use std::time::{Duration, SystemTime};

#[derive(Debug, Clone, Serialize)]
pub struct Heartbeat {
    pub ts: u64,
    pub nonce: String,
}

pub fn heartbeat() -> Heartbeat {
    let ts = SystemTime::now()
        .duration_since(SystemTime::UNIX_EPOCH)
        .unwrap_or(Duration::from_secs(0))
        .as_secs();
    let nonce: String = rand::thread_rng()
        .sample_iter(&Alphanumeric)
        .take(8)
        .map(char::from)
        .collect();
    Heartbeat { ts, nonce }
}