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::{
schema::{
captcha_answer,
comment,
community_person_ban,
instance,
person,
post,
received_activity,
sent_activity,
},
source::instance::{Instance, InstanceForm},
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utils::{naive_now, DELETED_REPLACEMENT_TEXT},
};
use lemmy_routes::nodeinfo::NodeInfo;
use lemmy_utils::{
error::{LemmyError, LemmyResult},
REQWEST_TIMEOUT,
};
use reqwest::blocking::Client;
use std::{thread, time::Duration};
use tracing::{error, info, warn};
/// 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 || {
PgConnection::establish(&url)
.map(|mut conn| {
active_counts(&mut conn);
update_banned_when_expired(&mut conn);
})
.map_err(|e| {
error!("Failed to establish db connection for active counts update: {e}");
})
.ok();
});
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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 || {
PgConnection::establish(&url)
.map(|mut conn| {
update_hot_ranks(&mut conn);
})
.map_err(|e| {
error!("Failed to establish db connection for hot ranks update: {e}");
})
.ok();
});
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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 || {
PgConnection::establish(&url)
.map(|mut conn| {
delete_expired_captcha_answers(&mut conn);
})
.map_err(|e| {
error!("Failed to establish db connection for captcha cleanup: {e}");
})
.ok();
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});
// Clear old activities every week
let url = db_url.clone();
scheduler.every(CTimeUnits::weeks(1)).run(move || {
PgConnection::establish(&url)
.map(|mut conn| {
clear_old_activities(&mut conn);
})
.map_err(|e| {
error!("Failed to establish db connection for activity cleanup: {e}");
})
.ok();
});
// 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 || {
PgConnection::establish(&db_url)
.map(|mut conn| {
overwrite_deleted_posts_and_comments(&mut conn);
})
.map_err(|e| {
error!("Failed to establish db connection for deleted content cleanup: {e}");
})
.ok();
});
// Update the Instance Software
scheduler.every(CTimeUnits::days(1)).run(move || {
PgConnection::establish(&url)
.map(|mut conn| {
update_instance_software(&mut conn, &user_agent)
.map_err(|e| warn!("Failed to update instance software: {e}"))
.ok();
})
.map_err(|e| {
error!("Failed to establish db connection for instance software update: {e}");
})
.ok();
});
// 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);
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update_hot_ranks(&mut conn);
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
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fn update_hot_ranks(conn: &mut PgConnection) {
info!("Updating hot ranks for all history...");
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process_hot_ranks_in_batches(
conn,
"post_aggregates",
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"a.hot_rank != 0 OR a.hot_rank_active != 0",
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"SET hot_rank = hot_rank(a.score, a.published),
hot_rank_active = hot_rank(a.score, a.newest_comment_time_necro)",
);
process_hot_ranks_in_batches(
conn,
"comment_aggregates",
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"a.hot_rank != 0",
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"SET hot_rank = hot_rank(a.score, a.published)",
);
process_hot_ranks_in_batches(
conn,
"community_aggregates",
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"a.hot_rank != 0",
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"SET hot_rank = hot_rank(a.subscribers, a.published)",
);
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 have been processed.
/// In `where_clause` and `set_clause`, "a" will refer to the current aggregates table.
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/// 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,
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where_clause: &str,
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set_clause: &str,
) {
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let process_start_time = NaiveDateTime::from_timestamp_opt(0, 0).expect("0 timestamp creation");
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let update_batch_size = 1000; // Bigger batches than this tend to cause seq scans
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let mut processed_rows_count = 0;
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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
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WHERE a.published > $1 AND ({where_clause})
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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,
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set_clause = set_clause,
where_clause = where_clause
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))
.bind::<Timestamp, _>(previous_batch_last_published)
.bind::<Integer, _>(update_batch_size)
.get_results::<HotRanksUpdateResult>(conn);
match result {
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Ok(updated_rows) => {
processed_rows_count += updated_rows.len();
previous_batch_result = updated_rows.last().map(|row| row.published);
}
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Err(e) => {
error!("Failed to update {} hot_ranks: {}", table_name, e);
break;
}
}
}
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info!(
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"Finished process_hot_ranks_in_batches execution for {} (processed {} rows)",
table_name, processed_rows_count
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);
}
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fn delete_expired_captcha_answers(conn: &mut PgConnection) {
diesel::delete(
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captcha_answer::table.filter(captcha_answer::published.lt(now - IntervalDsl::minutes(10))),
)
.execute(conn)
.map(|_| {
info!("Done.");
})
.map_err(|e| error!("Failed to clear old captcha answers: {e}"))
.ok();
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}
/// Clear old activities (this table gets very large)
fn clear_old_activities(conn: &mut PgConnection) {
info!("Clearing old activities...");
diesel::delete(sent_activity::table.filter(sent_activity::published.lt(now - 3.months())))
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.execute(conn)
.map_err(|e| error!("Failed to clear old sent activities: {e}"))
.ok();
diesel::delete(
received_activity::table.filter(received_activity::published.lt(now - 3.months())),
)
.execute(conn)
.map(|_| info!("Done."))
.map_err(|e| error!("Failed to clear old received activities: {e}"))
.ok();
}
/// overwrite posts and comments 30d after deletion
fn overwrite_deleted_posts_and_comments(conn: &mut PgConnection) {
info!("Overwriting deleted posts...");
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)
.map(|_| {
info!("Done.");
})
.map_err(|e| error!("Failed to overwrite deleted posts: {e}"))
.ok();
info!("Overwriting deleted comments...");
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)
.map(|_| {
info!("Done.");
})
.map_err(|e| error!("Failed to overwrite deleted comments: {e}"))
.ok();
}
/// 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
);
sql_query(update_site_stmt)
.execute(conn)
.map_err(|e| error!("Failed to update site stats: {e}"))
.ok();
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);
sql_query(update_community_stmt)
.execute(conn)
.map_err(|e| error!("Failed to update community stats: {e}"))
.ok();
}
info!("Done.");
}
/// Set banned to false after ban expires
fn update_banned_when_expired(conn: &mut PgConnection) {
info!("Updating banned column if it expires ...");
diesel::update(
person::table
.filter(person::banned.eq(true))
.filter(person::ban_expires.lt(now)),
)
.set(person::banned.eq(false))
.execute(conn)
.map_err(|e| error!("Failed to update person.banned when expires: {e}"))
.ok();
diesel::delete(community_person_ban::table.filter(community_person_ban::expires.lt(now)))
.execute(conn)
.map_err(|e| error!("Failed to remove community_ban expired rows: {e}"))
.ok();
}
/// Updates the instance software and version
///
/// TODO: this should be async
/// TODO: if instance has been dead for a long time, it should be checked less frequently
fn update_instance_software(conn: &mut PgConnection, user_agent: &str) -> LemmyResult<()> {
info!("Updating instances software and versions...");
let client = Client::builder()
.user_agent(user_agent)
.timeout(REQWEST_TIMEOUT)
.build()?;
let instances = instance::table.get_results::<Instance>(conn)?;
for instance in instances {
let node_info_url = format!("https://{}/nodeinfo/2.0.json", instance.domain);
// The `updated` column is used to check if instances are alive. If it is more than three days
// in the past, no outgoing activities will be sent to that instance. However not every
// Fediverse instance has a valid Nodeinfo endpoint (its not required for Activitypub). That's
// why we always need to mark instances as updated if they are alive.
let default_form = InstanceForm::builder()
.domain(instance.domain.clone())
.updated(Some(naive_now()))
.build();
let form = match client.get(&node_info_url).send() {
Ok(res) if res.status().is_client_error() => {
// Instance doesnt have nodeinfo but sent a response, consider it alive
Some(default_form)
}
Ok(res) => match res.json::<NodeInfo>() {
Ok(node_info) => {
// Instance sent valid nodeinfo, write it to db
Some(
InstanceForm::builder()
.domain(instance.domain)
.updated(Some(naive_now()))
.software(node_info.software.and_then(|s| s.name))
.version(node_info.version.clone())
.build(),
)
}
Err(_) => {
// No valid nodeinfo but valid HTTP response, consider instance alive
Some(default_form)
}
},
Err(_) => {
// dead instance, do nothing
None
}
};
if let Some(form) = form {
diesel::update(instance::table.find(instance.id))
.set(form)
.execute(conn)?;
}
}
info!("Finished updating instances software and versions...");
Ok(())
}
#[cfg(test)]
mod tests {
#![allow(clippy::unwrap_used)]
#![allow(clippy::indexing_slicing)]
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");
}
}