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