mirror of
https://github.com/LemmyNet/lemmy.git
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89 lines
2.8 KiB
Rust
89 lines
2.8 KiB
Rust
// Scheduler, and trait for .seconds(), .minutes(), etc.
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use clokwerk::{Scheduler, TimeUnits};
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// Import week days and WeekDay
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use diesel::{sql_query, PgConnection, RunQueryDsl};
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use lemmy_db_queries::{source::activity::Activity_, DbPool};
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use lemmy_db_schema::source::activity::Activity;
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use log::info;
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use std::{thread, time::Duration};
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/// Schedules various cleanup tasks for lemmy in a background thread
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pub fn setup(pool: DbPool) {
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let mut scheduler = Scheduler::new();
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let conn = pool.get().unwrap();
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active_counts(&conn);
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reindex_aggregates_tables(&conn);
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scheduler.every(1.hour()).run(move || {
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active_counts(&conn);
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reindex_aggregates_tables(&conn);
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});
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let conn = pool.get().unwrap();
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clear_old_activities(&conn);
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scheduler.every(1.weeks()).run(move || {
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clear_old_activities(&conn);
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});
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// Manually run the scheduler in an event loop
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loop {
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scheduler.run_pending();
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thread::sleep(Duration::from_millis(1000));
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}
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}
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/// Reindex the aggregates tables every one hour
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/// This is necessary because hot_rank is actually a mutable function:
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/// https://dba.stackexchange.com/questions/284052/how-to-create-an-index-based-on-a-time-based-function-in-postgres?noredirect=1#comment555727_284052
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fn reindex_aggregates_tables(conn: &PgConnection) {
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for table_name in &[
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"post_aggregates",
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"comment_aggregates",
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"community_aggregates",
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] {
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reindex_table(conn, table_name);
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}
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}
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fn reindex_table(conn: &PgConnection, table_name: &str) {
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info!("Reindexing table {} ...", table_name);
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let query = format!("reindex table concurrently {}", table_name);
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sql_query(query).execute(conn).expect("reindex table");
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info!("Done.");
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}
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/// Clear old activities (this table gets very large)
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fn clear_old_activities(conn: &PgConnection) {
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info!("Clearing old activities...");
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Activity::delete_olds(conn).expect("clear old activities");
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info!("Done.");
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}
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/// Re-calculate the site and community active counts every 12 hours
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fn active_counts(conn: &PgConnection) {
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info!("Updating active site and community aggregates ...");
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let intervals = vec![
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("1 day", "day"),
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("1 week", "week"),
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("1 month", "month"),
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("6 months", "half_year"),
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];
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for i in &intervals {
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let update_site_stmt = format!(
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"update site_aggregates set users_active_{} = (select * from site_aggregates_activity('{}'))",
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i.1, i.0
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);
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sql_query(update_site_stmt)
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.execute(conn)
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.expect("update site stats");
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let update_community_stmt = format!("update community_aggregates ca set users_active_{} = mv.count_ from community_aggregates_activity('{}') mv where ca.community_id = mv.community_id_", i.1, i.0);
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sql_query(update_community_stmt)
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.execute(conn)
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.expect("update community stats");
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}
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info!("Done.");
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}
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