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use crate::{config::Config, routes::with_runner};
use libangelshark::AcmRunner;
use once_cell::sync::Lazy;
use std::{
convert::Infallible,
sync::{Arc, Mutex},
};
use warp::{
body::{content_length_limit, json},
get, path, post, Filter, Rejection, Reply,
};
static HAYSTACK_CACHE: Lazy<Haystack> = Lazy::new(Haystack::new);
/// Collection of search terms
type Needle = Vec<String>;
pub fn search(config: &Config) -> impl Filter<Extract = impl Reply, Error = Rejection> + Clone {
let runner = config.runner.clone();
// TODO: anti-caching headers on resp?
path("search")
.and(post())
.and(content_length_limit(1024 * 16))
.and(json::<Needle>())
.and(with_runner(runner))
.and_then(handle_search)
}
pub fn refresh(config: &Config) -> impl Filter<Extract = impl Reply, Error = Rejection> + Clone {
let runner = config.runner.clone();
path!("search" / "refresh")
.and(get())
.and(with_runner(runner))
.and_then(handle_refresh)
}
async fn handle_search(terms: Needle, runner: AcmRunner) -> Result<impl Reply, Infallible> {
HAYSTACK_CACHE.search(Vec::new());
Ok("")
}
async fn handle_refresh(runner: AcmRunner) -> Result<impl Reply, Infallible> {
HAYSTACK_CACHE.refresh();
Ok("Refresh scheduled")
}
/// A lazy-loaded, asynchronously-refreshed exension-type haystack cache.
struct Haystack {
inner: Arc<Mutex<String>>,
}
impl Haystack {
fn new() -> Self {
Self {
inner: Arc::new(Mutex::new(String::with_capacity(0))),
}
}
pub fn search(&self, needle: Needle) -> String {
(*self.inner.lock().unwrap()).clone()
}
pub fn refresh(&self) {
let inner = self.inner.clone();
tokio::spawn(async move {
std::thread::sleep_ms(10000); // slow generation here
if let Ok(mut handle) = inner.lock() {
*handle = String::from("fresh");
eprintln!("evicted");
}
});
}
}
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