ppc_amnet/amnet-server/src/metrics.rs

use std::sync::{OnceLock, Mutex};

static METRICS: OnceLock<SystemMetrics> = OnceLock::new();

pub (crate) struct SystemMetrics {
    pub start_time: Mutex<Option<std::time::Instant>>,
    pub last_poll_time: Mutex<Option<std::time::Instant>>,
}

impl Default for SystemMetrics {
    fn default() -> Self {
        Self {
            start_time: Mutex::new(None),
            last_poll_time: Mutex::new(None),
        }
    }
}

impl SystemMetrics {
    pub fn instance() -> &'static SystemMetrics {
        METRICS.get_or_init(|| SystemMetrics::default())
    }
}