radvisor 1.3.1

Resource utilization monitor for Docker containers & Kubernetes pods that operates with fine granularity and low overhead.
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pub mod providers;

use crate::polling::providers::Provider;
use crate::shared::{CollectionEvent, IntervalWorkerContext};
use crate::timer::{Stoppable, Timer};
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::mpsc::Sender;
use std::sync::Arc;
use std::thread;

/// Thread function that updates the target list each second by default
pub fn run(
    tx: &Sender<CollectionEvent>,
    context: IntervalWorkerContext,
    provider: Box<dyn Provider>,
) {
    context.shell.status(
        "Beginning",
        format!(
            "provider polling with {} interval",
            humantime::Duration::from(context.interval)
        ),
    );

    let (timer, stop_handle) = Timer::new(context.interval, "poll");
    let has_stopped = Arc::new(AtomicBool::new(false));

    // Handle SIGINT/SIGTERMs by stopping the timer
    let mut term_rx = context.term_rx;
    let has_stopped_c = Arc::clone(&has_stopped);
    let shell_c = Arc::clone(&context.shell);
    thread::Builder::new()
        .name(String::from("poll-term"))
        .spawn(move || {
            term_rx.recv().unwrap();
            shell_c.status("Stopping", "polling");
            stop_handle.stop();
            has_stopped_c.store(true, Ordering::SeqCst);
        })
        .unwrap();
    // Move to mutable
    let mut provider = provider;

    for _ in timer {
        let events: Vec<CollectionEvent> = match provider.poll() {
            Ok(vec) => vec,
            Err(err) => {
                context
                    .shell
                    .error(format!("Could not poll target provider: {}", err));
                Vec::with_capacity(0)
            },
        };

        // Make sure the collection hasn't been stopped
        if !has_stopped.load(Ordering::SeqCst) {
            for event in events {
                if let Err(err) = tx.send(event) {
                    // If sending fails, then stop the collection thread
                    context.shell.error(format!(
                        "Could not send polled target events to collector thread: {}",
                        err
                    ));
                    break;
                }
            }
        }
    }
}