lemmy/src/scheduled_tasks.rs

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use chrono::NaiveDateTime;
use clokwerk::{Scheduler, TimeUnits as CTimeUnits};
use diesel::{
dsl::{now, IntervalDsl},
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sql_types::{Integer, Timestamp},
Connection,
ExpressionMethods,
NullableExpressionMethods,
QueryDsl,
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QueryableByName,
};
// Import week days and WeekDay
use diesel::{sql_query, PgConnection, RunQueryDsl};
use lemmy_api_common::context::LemmyContext;
use lemmy_db_schema::{
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schema::{activity, captcha_answer, comment, community_person_ban, instance, person, post},
source::instance::{Instance, InstanceForm},
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utils::{naive_now, DELETED_REPLACEMENT_TEXT},
};
use lemmy_routes::nodeinfo::NodeInfo;
use lemmy_utils::{error::LemmyError, REQWEST_TIMEOUT};
use reqwest::blocking::Client;
use std::{thread, time::Duration};
use tracing::{error, info};
/// Schedules various cleanup tasks for lemmy in a background thread
pub fn setup(
db_url: String,
user_agent: String,
context_1: LemmyContext,
) -> Result<(), LemmyError> {
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// Setup the connections
let mut scheduler = Scheduler::new();
startup_jobs(&db_url);
// Update active counts every hour
let url = db_url.clone();
scheduler.every(CTimeUnits::hour(1)).run(move || {
let mut conn = PgConnection::establish(&url).expect("could not establish connection");
active_counts(&mut conn);
update_banned_when_expired(&mut conn);
});
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// Update hot ranks every 15 minutes
let url = db_url.clone();
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scheduler.every(CTimeUnits::minutes(15)).run(move || {
let mut conn = PgConnection::establish(&url).expect("could not establish connection");
update_hot_ranks(&mut conn, true);
});
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// Delete any captcha answers older than ten minutes, every ten minutes
let url = db_url.clone();
scheduler.every(CTimeUnits::minutes(10)).run(move || {
let mut conn = PgConnection::establish(&url).expect("could not establish connection");
delete_expired_captcha_answers(&mut conn);
});
// Clear old activities every week
let url = db_url.clone();
scheduler.every(CTimeUnits::weeks(1)).run(move || {
let mut conn = PgConnection::establish(&url).expect("could not establish connection");
clear_old_activities(&mut conn);
});
// Remove old rate limit buckets after 1 to 2 hours of inactivity
scheduler.every(CTimeUnits::hour(1)).run(move || {
let hour = Duration::from_secs(3600);
context_1.settings_updated_channel().remove_older_than(hour);
});
// Overwrite deleted & removed posts and comments every day
let url = db_url.clone();
scheduler.every(CTimeUnits::days(1)).run(move || {
let mut conn = PgConnection::establish(&url).expect("could not establish connection");
overwrite_deleted_posts_and_comments(&mut conn);
});
// Update the Instance Software
scheduler.every(CTimeUnits::days(1)).run(move || {
let mut conn = PgConnection::establish(&db_url).expect("could not establish connection");
update_instance_software(&mut conn, &user_agent);
});
// Manually run the scheduler in an event loop
loop {
scheduler.run_pending();
thread::sleep(Duration::from_millis(1000));
}
}
/// Run these on server startup
fn startup_jobs(db_url: &str) {
let mut conn = PgConnection::establish(db_url).expect("could not establish connection");
active_counts(&mut conn);
update_hot_ranks(&mut conn, false);
update_banned_when_expired(&mut conn);
clear_old_activities(&mut conn);
overwrite_deleted_posts_and_comments(&mut conn);
}
/// Update the hot_rank columns for the aggregates tables
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/// Runs in batches until all necessary rows are updated once
fn update_hot_ranks(conn: &mut PgConnection, last_week_only: bool) {
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let process_start_time = if last_week_only {
info!("Updating hot ranks for last week...");
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naive_now() - chrono::Duration::days(7)
} else {
info!("Updating hot ranks for all history...");
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NaiveDateTime::from_timestamp_opt(0, 0).expect("0 timestamp creation")
};
process_hot_ranks_in_batches(
conn,
"post_aggregates",
"SET hot_rank = hot_rank(a.score, a.published),
hot_rank_active = hot_rank(a.score, a.newest_comment_time_necro)",
process_start_time,
);
process_hot_ranks_in_batches(
conn,
"comment_aggregates",
"SET hot_rank = hot_rank(a.score, a.published)",
process_start_time,
);
process_hot_ranks_in_batches(
conn,
"community_aggregates",
"SET hot_rank = hot_rank(a.subscribers, a.published)",
process_start_time,
);
info!("Finished hot ranks update!");
}
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#[derive(QueryableByName)]
struct HotRanksUpdateResult {
#[diesel(sql_type = Timestamp)]
published: NaiveDateTime,
}
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/// Runs the hot rank update query in batches until all rows after `process_start_time` have been
/// processed.
/// In `set_clause`, "a" will refer to the current aggregates table.
/// Locked rows are skipped in order to prevent deadlocks (they will likely get updated on the next
/// run)
fn process_hot_ranks_in_batches(
conn: &mut PgConnection,
table_name: &str,
set_clause: &str,
process_start_time: NaiveDateTime,
) {
let update_batch_size = 1000; // Bigger batches than this tend to cause seq scans
let mut previous_batch_result = Some(process_start_time);
while let Some(previous_batch_last_published) = previous_batch_result {
// Raw `sql_query` is used as a performance optimization - Diesel does not support doing this
// in a single query (neither as a CTE, nor using a subquery)
let result = sql_query(format!(
r#"WITH batch AS (SELECT a.id
FROM {aggregates_table} a
WHERE a.published > $1
ORDER BY a.published
LIMIT $2
FOR UPDATE SKIP LOCKED)
UPDATE {aggregates_table} a {set_clause}
FROM batch WHERE a.id = batch.id RETURNING a.published;
"#,
aggregates_table = table_name,
set_clause = set_clause
))
.bind::<Timestamp, _>(previous_batch_last_published)
.bind::<Integer, _>(update_batch_size)
.get_results::<HotRanksUpdateResult>(conn);
match result {
Ok(updated_rows) => previous_batch_result = updated_rows.last().map(|row| row.published),
Err(e) => {
error!("Failed to update {} hot_ranks: {}", table_name, e);
break;
}
}
}
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info!(
"Finished process_hot_ranks_in_batches execution for {}",
table_name
);
}
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fn delete_expired_captcha_answers(conn: &mut PgConnection) {
match diesel::delete(
captcha_answer::table.filter(captcha_answer::published.lt(now - IntervalDsl::minutes(10))),
)
.execute(conn)
{
Ok(_) => {
info!("Done.");
}
Err(e) => {
error!("Failed to clear old captcha answers: {}", e)
}
}
}
/// Clear old activities (this table gets very large)
fn clear_old_activities(conn: &mut PgConnection) {
info!("Clearing old activities...");
match diesel::delete(activity::table.filter(activity::published.lt(now - 6.months())))
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.execute(conn)
{
Ok(_) => {
info!("Done.");
}
Err(e) => {
error!("Failed to clear old activities: {}", e)
}
}
}
/// overwrite posts and comments 30d after deletion
fn overwrite_deleted_posts_and_comments(conn: &mut PgConnection) {
info!("Overwriting deleted posts...");
match diesel::update(
post::table
.filter(post::deleted.eq(true))
.filter(post::updated.lt(now.nullable() - 1.months()))
.filter(post::body.ne(DELETED_REPLACEMENT_TEXT)),
)
.set((
post::body.eq(DELETED_REPLACEMENT_TEXT),
post::name.eq(DELETED_REPLACEMENT_TEXT),
))
.execute(conn)
{
Ok(_) => {
info!("Done.");
}
Err(e) => {
error!("Failed to overwrite deleted posts: {}", e)
}
}
info!("Overwriting deleted comments...");
match diesel::update(
comment::table
.filter(comment::deleted.eq(true))
.filter(comment::updated.lt(now.nullable() - 1.months()))
.filter(comment::content.ne(DELETED_REPLACEMENT_TEXT)),
)
.set(comment::content.eq(DELETED_REPLACEMENT_TEXT))
.execute(conn)
{
Ok(_) => {
info!("Done.");
}
Err(e) => {
error!("Failed to overwrite deleted comments: {}", e)
}
}
}
/// 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('{}')) where site_id = 1",
i.1, i.0
);
match sql_query(update_site_stmt).execute(conn) {
Ok(_) => {}
Err(e) => {
error!("Failed to update site stats: {}", e)
}
}
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);
match sql_query(update_community_stmt).execute(conn) {
Ok(_) => {}
Err(e) => {
error!("Failed to update community stats: {}", e)
}
}
}
info!("Done.");
}
/// Set banned to false after ban expires
fn update_banned_when_expired(conn: &mut PgConnection) {
info!("Updating banned column if it expires ...");
match diesel::update(
person::table
.filter(person::banned.eq(true))
.filter(person::ban_expires.lt(now)),
)
.set(person::banned.eq(false))
.execute(conn)
{
Ok(_) => {}
Err(e) => {
error!("Failed to update person.banned when expires: {}", e)
}
}
match diesel::delete(community_person_ban::table.filter(community_person_ban::expires.lt(now)))
.execute(conn)
{
Ok(_) => {}
Err(e) => {
error!("Failed to remove community_ban expired rows: {}", e)
}
}
}
/// Updates the instance software and version
fn update_instance_software(conn: &mut PgConnection, user_agent: &str) {
info!("Updating instances software and versions...");
let client = match Client::builder()
.user_agent(user_agent)
.timeout(REQWEST_TIMEOUT)
.build()
{
Ok(client) => client,
Err(e) => {
error!("Failed to build reqwest client: {}", e);
return;
}
};
let instances = match instance::table.get_results::<Instance>(conn) {
Ok(instances) => instances,
Err(e) => {
error!("Failed to get instances: {}", e);
return;
}
};
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();
match diesel::update(instance::table.find(instance.id))
.set(form)
.execute(conn)
{
Ok(_) => {
info!("Done.");
}
Err(e) => {
error!("Failed to update site instance software: {}", e);
return;
}
}
}
}
}
#[cfg(test)]
mod tests {
use lemmy_routes::nodeinfo::NodeInfo;
use reqwest::Client;
#[tokio::test]
#[ignore]
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");
}
}