52 lines
2.0 KiB
Rust
52 lines
2.0 KiB
Rust
use async_std::{channel::Receiver, fs, path::PathBuf, task};
|
|
use chrono::{prelude::*, Duration};
|
|
use futures::{TryStreamExt, future::FutureExt};
|
|
use sqlx::{postgres::PgPool, Row};
|
|
|
|
pub(crate) async fn delete_old_files(receiver: Receiver<()>, db: PgPool, files_dir: PathBuf) {
|
|
loop {
|
|
wait_for_file_expiry(&receiver, &db).await;
|
|
|
|
let now = Local::now().naive_local();
|
|
let mut rows = sqlx::query("SELECT file_id FROM files WHERE files.valid_till < $1")
|
|
.bind(now)
|
|
.fetch(&db);
|
|
while let Some(row) = rows.try_next().await.expect("could not load expired files") {
|
|
let file_id: String = row.try_get("file_id").expect("we selected this column");
|
|
let mut path = files_dir.clone();
|
|
path.push(&file_id);
|
|
if path.exists().await {
|
|
log::info!("delete file {}", file_id);
|
|
fs::remove_file(&path).await.expect("could not delete file");
|
|
}
|
|
}
|
|
|
|
sqlx::query("DELETE FROM files WHERE valid_till < $1")
|
|
.bind(now)
|
|
.execute(&db)
|
|
.await
|
|
.expect("could not delete expired files from database");
|
|
}
|
|
}
|
|
|
|
async fn wait_for_file_expiry(receiver: &Receiver<()>, db: &PgPool) {
|
|
let mut rows = sqlx::query("SELECT MIN(valid_till) as min from files").fetch(db);
|
|
let row = rows
|
|
.try_next()
|
|
.await
|
|
.expect("could not fetch expiring files from database")
|
|
.expect("postgres min did not return any row");
|
|
let valid_till: Option<NaiveDateTime> = row.get("min");
|
|
let next_timeout = match valid_till {
|
|
Some(valid_till) => valid_till.signed_duration_since(Local::now().naive_local()),
|
|
None => Duration::days(1),
|
|
};
|
|
let positive_timeout = next_timeout
|
|
.to_std()
|
|
.unwrap_or_else(|_| std::time::Duration::from_secs(0));
|
|
futures::select! {
|
|
_ = task::sleep(positive_timeout).fuse() => {}
|
|
_ = receiver.recv().fuse() => {}
|
|
}
|
|
}
|