lemmy/src/scheduled_tasks.rs

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use clokwerk::{Scheduler, TimeUnits};
// Import week days and WeekDay
use diesel::{sql_query, PgConnection, RunQueryDsl};
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use diesel::{Connection, ExpressionMethods, QueryDsl};
use lemmy_db_schema::{
source::instance::{Instance, InstanceForm},
utils::naive_now,
};
use lemmy_routes::nodeinfo::NodeInfo;
use lemmy_utils::{error::LemmyError, REQWEST_TIMEOUT};
use reqwest::blocking::Client;
use std::{thread, time::Duration};
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use tracing::info;
/// Schedules various cleanup tasks for lemmy in a background thread
pub fn setup(db_url: String, user_agent: String) -> Result<(), LemmyError> {
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// Setup the connections
let mut scheduler = Scheduler::new();
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let mut conn = PgConnection::establish(&db_url).expect("could not establish connection");
let mut conn_2 = PgConnection::establish(&db_url).expect("could not establish connection");
active_counts(&mut conn);
update_banned_when_expired(&mut conn);
// On startup, reindex the tables non-concurrently
// TODO remove this for now, since it slows down startup a lot on lemmy.ml
reindex_aggregates_tables(&mut conn, true);
scheduler.every(1.hour()).run(move || {
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let conn = &mut PgConnection::establish(&db_url)
.unwrap_or_else(|_| panic!("Error connecting to {db_url}"));
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active_counts(conn);
update_banned_when_expired(conn);
reindex_aggregates_tables(conn, true);
drop_ccnew_indexes(conn);
});
clear_old_activities(&mut conn);
scheduler.every(1.weeks()).run(move || {
clear_old_activities(&mut conn);
});
update_instance_software(&mut conn_2, &user_agent);
scheduler.every(1.days()).run(move || {
update_instance_software(&mut conn_2, &user_agent);
});
// Manually run the scheduler in an event loop
loop {
scheduler.run_pending();
thread::sleep(Duration::from_millis(1000));
}
}
/// Reindex the aggregates tables every one hour
/// This is necessary because hot_rank is actually a mutable function:
/// https://dba.stackexchange.com/questions/284052/how-to-create-an-index-based-on-a-time-based-function-in-postgres?noredirect=1#comment555727_284052
fn reindex_aggregates_tables(conn: &mut PgConnection, concurrently: bool) {
for table_name in &[
"post_aggregates",
"comment_aggregates",
"community_aggregates",
] {
reindex_table(conn, table_name, concurrently);
}
}
fn reindex_table(conn: &mut PgConnection, table_name: &str, concurrently: bool) {
let concurrently_str = if concurrently { "concurrently" } else { "" };
info!("Reindexing table {} {} ...", concurrently_str, table_name);
let query = format!("reindex table {concurrently_str} {table_name}");
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sql_query(query).execute(conn).expect("reindex table");
info!("Done.");
}
/// Clear old activities (this table gets very large)
fn clear_old_activities(conn: &mut PgConnection) {
use diesel::dsl::{now, IntervalDsl};
use lemmy_db_schema::schema::activity::dsl::{activity, published};
info!("Clearing old activities...");
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diesel::delete(activity.filter(published.lt(now - 6.months())))
.execute(conn)
.expect("clear old activities");
info!("Done.");
}
/// Re-calculate the site and community active counts every 12 hours
fn active_counts(conn: &mut PgConnection) {
info!("Updating active site and community aggregates ...");
let intervals = vec![
("1 day", "day"),
("1 week", "week"),
("1 month", "month"),
("6 months", "half_year"),
];
for i in &intervals {
let update_site_stmt = format!(
"update site_aggregates set users_active_{} = (select * from site_aggregates_activity('{}'))",
i.1, i.0
);
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sql_query(update_site_stmt)
.execute(conn)
.expect("update site stats");
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)
.execute(conn)
.expect("update community stats");
}
info!("Done.");
}
/// Set banned to false after ban expires
fn update_banned_when_expired(conn: &mut PgConnection) {
info!("Updating banned column if it expires ...");
let update_ban_expires_stmt =
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"update person set banned = false where banned = true and ban_expires < now()";
sql_query(update_ban_expires_stmt)
.execute(conn)
.expect("update banned when expires");
}
/// Drops the phantom CCNEW indexes created by postgres
/// https://github.com/LemmyNet/lemmy/issues/2431
fn drop_ccnew_indexes(conn: &mut PgConnection) {
info!("Dropping phantom ccnew indexes...");
let drop_stmt = "select drop_ccnew_indexes()";
sql_query(drop_stmt)
.execute(conn)
.expect("drop ccnew indexes");
}
/// Updates the instance software and version
fn update_instance_software(conn: &mut PgConnection, user_agent: &str) {
use lemmy_db_schema::schema::instance;
info!("Updating instances software and versions...");
let client = Client::builder()
.user_agent(user_agent)
.timeout(REQWEST_TIMEOUT)
.build()
.expect("couldnt build reqwest client");
let instances = instance::table
.get_results::<Instance>(conn)
.expect("no instances found");
for instance in instances {
let node_info_url = format!("https://{}/nodeinfo/2.0.json", instance.domain);
// Skip it if it can't connect
let res = client
.get(&node_info_url)
.send()
.ok()
.and_then(|t| t.json::<NodeInfo>().ok());
if let Some(node_info) = res {
let software = node_info.software.as_ref();
let form = InstanceForm::builder()
.domain(instance.domain)
.software(software.and_then(|s| s.name.clone()))
.version(software.and_then(|s| s.version.clone()))
.updated(Some(naive_now()))
.build();
diesel::update(instance::table.find(instance.id))
.set(form)
.execute(conn)
.expect("update site instance software");
}
}
info!("Done.");
}
#[cfg(test)]
mod tests {
use lemmy_routes::nodeinfo::NodeInfo;
use reqwest::Client;
#[tokio::test]
async fn test_nodeinfo() {
let client = Client::builder().build().unwrap();
let lemmy_ml_nodeinfo = client
.get("https://lemmy.ml/nodeinfo/2.0.json")
.send()
.await
.unwrap()
.json::<NodeInfo>()
.await
.unwrap();
assert_eq!(lemmy_ml_nodeinfo.software.unwrap().name.unwrap(), "lemmy");
}
}