cvmshot/src/main.rs

use std::{collections::HashMap, time::Duration};

use chrono::Timelike;
use tokio::task::JoinHandle;

use tracing::{Instrument, Level};
use tracing_subscriber::FmtSubscriber;

use serde::Deserialize;
use toml;

mod guac;
mod shotter;

fn duration_until_next_minute() -> Duration {
    let now = chrono::Utc::now();
    let interval = (60 - now.second()) * 1000;

    // not sure if this ever triggers
    if interval == 0 {
        return Duration::from_secs(59);
    }

    return Duration::from_millis(interval as u64);
}

#[derive(Deserialize, Debug, Clone)]
struct Node {
    url: String,
    origin: String,
}

#[derive(Deserialize)]
struct Config {
    root_path: std::path::PathBuf,

    webp_quality: f32,

    vms: HashMap<String, Node>,
}

#[tokio::main]
async fn main() -> anyhow::Result<()> {
    #[cfg(debug_assertions)]
    let subscriber = FmtSubscriber::builder()
        .with_max_level(Level::TRACE)
        .compact()
        .finish();

    #[cfg(not(debug_assertions))]
    let subscriber = FmtSubscriber::builder()
        .with_max_level(Level::INFO)
        .compact()
        .finish();

    tracing::subscriber::set_global_default(subscriber)?;

    let _ = rustls::crypto::aws_lc_rs::default_provider().install_default();

    let config: Config = toml::from_str(std::fs::read_to_string("./config.toml")?.as_str())?;

    // Essentially this is meant to be a sentinel for "SCREENSHOT NOW!"
    let (tx, _) = tokio::sync::broadcast::channel::<Option<()>>(10);

    for (id, node) in config.vms.iter() {
        tracing::info!("Adding node {id} : {:?}", node);

        let mut clone = tx.subscribe();
        let path = config.root_path.join(id);
        let id_clone = id.clone();
        let node_clone = node.clone();

        let _: JoinHandle<anyhow::Result<()>> = tokio::spawn(async move {
            while let Some(_) = clone.recv().await? {
                let span = tracing::span!(
                    Level::INFO,
                    "node screenshot",
                    // FIXME: This should NOT be hardcoded
                    node = id_clone.as_str()
                );

                match shotter::take_one_screenshot(
                    &node_clone.url,
                    &node_clone.origin,
                    &id_clone,
                    path.clone(),
                    config.webp_quality,
                )
                .instrument(span)
                .await
                {
                    Ok(_) => {}

                    Err(error) => {
                        // FIXME: On WebSocket errors, should we just try again?
                        tracing::error!("Error taking screenshot: {error}");
                    }
                };
            }

            Ok(())
        });
    }

    loop {
        tx.send(Some(()))?;

        let dur = duration_until_next_minute();
        tracing::info!("Waiting {:?}", dur);
        tokio::time::sleep(dur).await;
    }
}