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//! Connectors to external things
//!
//! External services or APIs have structres here that allow access.
//!
//! All connector structs should have a suffic of `Connector`.
mod gatherer;
use std::ops::DerefMut;
#[doc(hidden)]
pub use gatherer::{GathererCommand, GathererConnector, GathererData};
use timeparse::{Duration, OffsetDateTime};
use tokio::sync::Mutex;
/// cache management structure
struct CacheItem<T: Clone> {
item: Mutex<Option<T>>,
time: Mutex<OffsetDateTime>,
timeout: Duration,
}
impl<T: Clone> CacheItem<T> {
pub fn new(timeout: Duration) -> Self {
Self {
item: Mutex::new(None),
time: Mutex::new(timeparse::now_utc()),
timeout,
}
}
pub fn new_with_item(item: T, timeout: Duration) -> Self {
Self {
item: Mutex::new(Some(item)),
time: Mutex::new(timeparse::now_utc()),
timeout,
}
}
pub async fn get(&self) -> Option<T> {
if self.duration_since_cache().await > self.timeout {
let _ = self.item.lock().await.take();
None
} else {
let item = self.item.lock().await.clone();
item
}
}
pub async fn store(&self, item: T) {
let mut item_lock = self.item.lock().await;
let mut time_lock = self.time.lock().await;
*item_lock.deref_mut() = Some(item);
*time_lock.deref_mut() = timeparse::now_utc();
}
pub async fn duration_since_cache(&self) -> Duration {
let time_lock = self.time.lock().await;
*time_lock - timeparse::now_utc()
}
}
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