meld 0.1.1

Deterministic filesystem state management using Merkle trees
Documentation 
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//! Shared telemetry helpers: timestamps and session id generation.

use std::sync::atomic::{AtomicU64, Ordering};
use std::time::{SystemTime, UNIX_EPOCH};

static SESSION_COUNTER: AtomicU64 = AtomicU64::new(1);

/// Current time as milliseconds since Unix epoch.
pub fn now_millis() -> u64 {
    SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .map(|d| d.as_millis() as u64)
        .unwrap_or(0)
}

/// Generate a unique session id.
pub fn new_session_id() -> String {
    let ts = now_millis();
    let pid = std::process::id();
    let seq = SESSION_COUNTER.fetch_add(1, Ordering::Relaxed);
    format!("sess-{ts}-{pid}-{seq}")
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn session_ids_are_unique() {
        let a = new_session_id();
        let b = new_session_id();
        assert_ne!(a, b);
    }
}