76 lines
2.4 KiB
Rust
76 lines
2.4 KiB
Rust
use async_std::{
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channel::Receiver,
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fs,
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path::{Path, PathBuf},
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task,
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};
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use chrono::{prelude::*, Duration};
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use futures::{future::FutureExt, TryStreamExt};
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use sqlx::{postgres::PgPool, 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 rows = 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) = rows.try_next().await.expect("could not load expired files") {
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let file_id: String = row.try_get("file_id").expect("we selected this column");
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delete_content(&file_id, &files_dir)
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.await
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.expect("could not delete file");
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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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pub(crate) async fn delete_by_id(
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db: &PgPool,
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file_id: &str,
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files_dir: &Path,
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) -> Result<(), sqlx::Error> {
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delete_content(file_id, &files_dir).await?;
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sqlx::query("DELETE FROM files WHERE file_id = $1")
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.bind(file_id)
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.execute(db)
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.await?;
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Ok(())
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}
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async fn delete_content(file_id: &str, files_dir: &Path) -> Result<(), std::io::Error> {
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let path = files_dir.join(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?;
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}
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Ok(())
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}
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async fn wait_for_file_expiry(receiver: &Receiver<()>, db: &PgPool) {
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let mut rows = sqlx::query("SELECT MIN(valid_till) as min from files").fetch(db);
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let row = rows
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.try_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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