testcontainers 0.27.3

A library for integration-testing against docker containers from within Rust.
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//! Watchdog that stops and removes containers on SIGTERM, SIGINT, or SIGQUIT
//!
//! By default, the watchdog is disabled. To enable it, enable the `watchdog` feature.
//! Note that it works in background thread and may panic.

use std::{collections::BTreeSet, sync::Mutex, thread};

use conquer_once::Lazy;
use signal_hook::{
    consts::{SIGINT, SIGQUIT, SIGTERM},
    iterator::Signals,
};

use crate::core::client::Client;

static WATCHDOG: Lazy<Mutex<Watchdog>> = Lazy::new(|| {
    thread::spawn(move || {
        let runtime = tokio::runtime::Builder::new_current_thread()
            .enable_all()
            .build()
            .expect("failed to start watchdog runtime in background");

        runtime.block_on(async {
            let signal_docker = Client::lazy_client()
                .await
                .expect("failed to create docker client");
            let mut signals = Signals::new([SIGTERM, SIGINT, SIGQUIT])
                .expect("failed to register signal handler");

            for signal in &mut signals {
                for container_id in WATCHDOG
                    .lock()
                    .map(|s| s.containers.clone())
                    .unwrap_or_default()
                {
                    signal_docker
                        .stop(&container_id, None)
                        .await
                        .expect("failed to stop container");
                    signal_docker
                        .rm(&container_id)
                        .await
                        .expect("failed to remove container")
                }

                let _ = signal_hook::low_level::emulate_default_handler(signal);
            }
        });
    });

    Mutex::new(Watchdog::default())
});

#[derive(Default)]
pub(crate) struct Watchdog {
    containers: BTreeSet<String>,
}

/// Register a container for observation
pub(crate) fn register(container_id: String) {
    WATCHDOG
        .lock()
        .expect("failed to access watchdog")
        .containers
        .insert(container_id);
}
/// Unregisters a container for observation
pub(crate) fn unregister(container_id: &str) {
    WATCHDOG
        .lock()
        .expect("failed to access watchdog")
        .containers
        .remove(container_id);
}