1 // Scheduler, and trait for .seconds(), .minutes(), etc.
2 use clokwerk::{Scheduler, TimeUnits};
3 // Import week days and WeekDay
4 use diesel::{sql_query, PgConnection, RunQueryDsl};
5 use lemmy_db_queries::{source::activity::Activity_, DbPool};
6 use lemmy_db_schema::source::activity::Activity;
8 use std::{thread, time::Duration};
10 /// Schedules various cleanup tasks for lemmy in a background thread
11 pub fn setup(pool: DbPool) {
12 let mut scheduler = Scheduler::new();
14 let conn = pool.get().unwrap();
16 reindex_aggregates_tables(&conn);
17 scheduler.every(1.hour()).run(move || {
19 reindex_aggregates_tables(&conn);
22 let conn = pool.get().unwrap();
23 clear_old_activities(&conn);
24 scheduler.every(1.weeks()).run(move || {
25 clear_old_activities(&conn);
28 // Manually run the scheduler in an event loop
30 scheduler.run_pending();
31 thread::sleep(Duration::from_millis(1000));
35 /// Reindex the aggregates tables every one hour
36 /// This is necessary because hot_rank is actually a mutable function:
37 /// https://dba.stackexchange.com/questions/284052/how-to-create-an-index-based-on-a-time-based-function-in-postgres?noredirect=1#comment555727_284052
38 fn reindex_aggregates_tables(conn: &PgConnection) {
42 "community_aggregates",
44 reindex_table(&conn, &table_name);
48 fn reindex_table(conn: &PgConnection, table_name: &str) {
49 info!("Reindexing table {} ...", table_name);
50 let query = format!("reindex table concurrently {}", table_name);
51 sql_query(query).execute(conn).expect("reindex table");
55 /// Clear old activities (this table gets very large)
56 fn clear_old_activities(conn: &PgConnection) {
57 info!("Clearing old activities...");
58 Activity::delete_olds(&conn).expect("clear old activities");
62 /// Re-calculate the site and community active counts every 12 hours
63 fn active_counts(conn: &PgConnection) {
64 info!("Updating active site and community aggregates ...");
70 ("6 months", "half_year"),
74 let update_site_stmt = format!(
75 "update site_aggregates set users_active_{} = (select * from site_aggregates_activity('{}'))",
78 sql_query(update_site_stmt)
80 .expect("update site stats");
82 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);
83 sql_query(update_community_stmt)
85 .expect("update community stats");