Async scheduler (#3949)

* fix: switch to async scheduler

* fix: pass context to scheduled tasks

* Merge remote-tracking branch 'upstream/main' into async-scheduler

* retrigger ci

* retrigger ci

src/lib.rs

@@ -54,7 +54,7 @@ use lemmy_utils::{
 use reqwest::Client;
 use reqwest_middleware::{ClientBuilder, ClientWithMiddleware};
 use reqwest_tracing::TracingMiddleware;
-use std::{env, ops::Deref, thread, time::Duration};
+use std::{env, ops::Deref, time::Duration};
 use tokio::signal::unix::SignalKind;
 use tracing::subscriber::set_global_default;
 use tracing_actix_web::TracingLogger;
@@ -181,13 +181,7 @@ pub async fn start_lemmy_server(args: CmdArgs) -> Result<(), LemmyError> {
 
   if scheduled_tasks_enabled {
     // Schedules various cleanup tasks for the DB
-    thread::spawn({
-      let context = context.clone();
-      move || {
-        scheduled_tasks::setup(db_url, user_agent, context)
-          .expect("Couldn't set up scheduled_tasks");
-      }
-    });
+    let _scheduled_tasks = tokio::task::spawn(scheduled_tasks::setup(context.clone()));
   }
 
   #[cfg(feature = "prometheus-metrics")]

src/scheduled_tasks.rs

@@ -1,16 +1,15 @@
 use chrono::{DateTime, TimeZone, Utc};
-use clokwerk::{Scheduler, TimeUnits as CTimeUnits};
+use clokwerk::{AsyncScheduler, TimeUnits as CTimeUnits};
 use diesel::{
   dsl::IntervalDsl,
+  sql_query,
   sql_types::{Integer, Timestamptz},
-  Connection,
   ExpressionMethods,
   NullableExpressionMethods,
   QueryDsl,
   QueryableByName,
 };
-// Import week days and WeekDay
-use diesel::{sql_query, PgConnection, RunQueryDsl};
+use diesel_async::{AsyncPgConnection, RunQueryDsl};
 use lemmy_api_common::context::LemmyContext;
 use lemmy_db_schema::{
   schema::{
@@ -24,153 +23,144 @@ use lemmy_db_schema::{
     sent_activity,
   },
   source::instance::{Instance, InstanceForm},
-  utils::{naive_now, now, DELETED_REPLACEMENT_TEXT},
+  utils::{get_conn, naive_now, now, DbPool, 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 lemmy_utils::error::{LemmyError, LemmyResult};
+use reqwest_middleware::ClientWithMiddleware;
+use std::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> {
+pub async fn setup(context: LemmyContext) -> Result<(), LemmyError> {
   // Setup the connections
-  let mut scheduler = Scheduler::new();
-
-  startup_jobs(&db_url);
+  let mut scheduler = AsyncScheduler::new();
+  startup_jobs(&mut context.pool()).await;
 
+  let context_1 = context.clone();
   // 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();
+    let context = context_1.clone();
+
+    async move {
+      active_counts(&mut context.pool()).await;
+      update_banned_when_expired(&mut context.pool()).await;
+    }
   });
 
+  let context_1 = context.clone();
   // Update hot ranks every 15 minutes
-  let url = db_url.clone();
-  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();
-  });
-
-  // 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();
+    let context = context_1.clone();
+
+    async move {
+      update_hot_ranks(&mut context.pool()).await;
+    }
   });
 
+  let context_1 = context.clone();
+  // Delete any captcha answers older than ten minutes, every ten minutes
+  scheduler.every(CTimeUnits::minutes(10)).run(move || {
+    let context = context_1.clone();
+
+    async move {
+      delete_expired_captcha_answers(&mut context.pool()).await;
+    }
+  });
+
+  let context_1 = context.clone();
   // 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();
+    let context = context_1.clone();
+
+    async move {
+      clear_old_activities(&mut context.pool()).await;
+    }
   });
 
+  let context_1 = context.clone();
   // Remove old rate limit buckets after 1 to 2 hours of inactivity
   scheduler.every(CTimeUnits::hour(1)).run(move || {
+    let context = context_1.clone();
+
+    async move {
       let hour = Duration::from_secs(3600);
-    context_1.settings_updated_channel().remove_older_than(hour);
+      context.settings_updated_channel().remove_older_than(hour);
+    }
   });
 
+  let context_1 = context.clone();
   // 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();
+    let context = context_1.clone();
+
+    async move {
+      overwrite_deleted_posts_and_comments(&mut context.pool()).await;
+    }
   });
 
+  let context_1 = context.clone();
   // Update the Instance Software
   scheduler.every(CTimeUnits::days(1)).run(move || {
-    PgConnection::establish(&url)
-      .map(|mut conn| {
-        update_instance_software(&mut conn, &user_agent)
+    let context = context_1.clone();
+
+    async move {
+      update_instance_software(&mut context.pool(), context.client())
+        .await
         .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));
+    scheduler.run_pending().await;
+    tokio::time::sleep(Duration::from_millis(1000)).await;
   }
 }
 
 /// 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);
-  update_banned_when_expired(&mut conn);
-  clear_old_activities(&mut conn);
-  overwrite_deleted_posts_and_comments(&mut conn);
+async fn startup_jobs(pool: &mut DbPool<'_>) {
+  active_counts(pool).await;
+  update_hot_ranks(pool).await;
+  update_banned_when_expired(pool).await;
+  clear_old_activities(pool).await;
+  overwrite_deleted_posts_and_comments(pool).await;
 }
 
 /// Update the hot_rank columns for the aggregates tables
 /// Runs in batches until all necessary rows are updated once
-fn update_hot_ranks(conn: &mut PgConnection) {
+async fn update_hot_ranks(pool: &mut DbPool<'_>) {
   info!("Updating hot ranks for all history...");
 
-  process_post_aggregates_ranks_in_batches(conn);
+  let conn = get_conn(pool).await;
+
+  match conn {
+    Ok(mut conn) => {
+      process_post_aggregates_ranks_in_batches(&mut conn).await;
 
       process_ranks_in_batches(
-    conn,
+        &mut conn,
         "comment_aggregates",
         "a.hot_rank != 0",
         "SET hot_rank = hot_rank(a.score, a.published)",
-  );
+      )
+      .await;
 
       process_ranks_in_batches(
-    conn,
+        &mut conn,
         "community_aggregates",
         "a.hot_rank != 0",
         "SET hot_rank = hot_rank(a.subscribers, a.published)",
-  );
+      )
+      .await;
 
       info!("Finished hot ranks update!");
+    }
+    Err(e) => {
+      error!("Failed to get connection from pool: {e}");
+    }
+  }
 }
 
 #[derive(QueryableByName)]
@@ -183,8 +173,8 @@ struct HotRanksUpdateResult {
 /// In `where_clause` and `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_ranks_in_batches(
-  conn: &mut PgConnection,
+async fn process_ranks_in_batches(
+  conn: &mut AsyncPgConnection,
   table_name: &str,
   where_clause: &str,
   set_clause: &str,
@@ -216,7 +206,8 @@ fn process_ranks_in_batches(
     ))
     .bind::<Timestamptz, _>(previous_batch_last_published)
     .bind::<Integer, _>(update_batch_size)
-    .get_results::<HotRanksUpdateResult>(conn);
+    .get_results::<HotRanksUpdateResult>(conn)
+    .await;
 
     match result {
       Ok(updated_rows) => {
@@ -237,7 +228,7 @@ fn process_ranks_in_batches(
 
 /// Post aggregates is a special case, since it needs to join to the community_aggregates
 /// table, to get the active monthly user counts.
-fn process_post_aggregates_ranks_in_batches(conn: &mut PgConnection) {
+async fn process_post_aggregates_ranks_in_batches(conn: &mut AsyncPgConnection) {
   let process_start_time: DateTime<Utc> = Utc
     .timestamp_opt(0, 0)
     .single()
@@ -265,7 +256,8 @@ fn process_post_aggregates_ranks_in_batches(conn: &mut PgConnection) {
     )
     .bind::<Timestamptz, _>(previous_batch_last_published)
     .bind::<Integer, _>(update_batch_size)
-    .get_results::<HotRanksUpdateResult>(conn);
+    .get_results::<HotRanksUpdateResult>(conn)
+    .await;
 
     match result {
       Ok(updated_rows) => {
@@ -284,38 +276,64 @@ fn process_post_aggregates_ranks_in_batches(conn: &mut PgConnection) {
   );
 }
 
-fn delete_expired_captcha_answers(conn: &mut PgConnection) {
+async fn delete_expired_captcha_answers(pool: &mut DbPool<'_>) {
+  let conn = get_conn(pool).await;
+
+  match conn {
+    Ok(mut conn) => {
       diesel::delete(
-    captcha_answer::table.filter(captcha_answer::published.lt(now() - IntervalDsl::minutes(10))),
+        captcha_answer::table
+          .filter(captcha_answer::published.lt(now() - IntervalDsl::minutes(10))),
       )
-  .execute(conn)
+      .execute(&mut conn)
+      .await
       .map(|_| {
         info!("Done.");
       })
       .map_err(|e| error!("Failed to clear old captcha answers: {e}"))
       .ok();
+    }
+    Err(e) => {
+      error!("Failed to get connection from pool: {e}");
+    }
+  }
 }
 
 /// Clear old activities (this table gets very large)
-fn clear_old_activities(conn: &mut PgConnection) {
+async fn clear_old_activities(pool: &mut DbPool<'_>) {
   info!("Clearing old activities...");
+  let conn = get_conn(pool).await;
+
+  match conn {
+    Ok(mut conn) => {
       diesel::delete(sent_activity::table.filter(sent_activity::published.lt(now() - 3.months())))
-    .execute(conn)
+        .execute(&mut conn)
+        .await
         .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)
+      .execute(&mut conn)
+      .await
       .map(|_| info!("Done."))
       .map_err(|e| error!("Failed to clear old received activities: {e}"))
       .ok();
+    }
+    Err(e) => {
+      error!("Failed to get connection from pool: {e}");
+    }
+  }
 }
 
 /// overwrite posts and comments 30d after deletion
-fn overwrite_deleted_posts_and_comments(conn: &mut PgConnection) {
+async fn overwrite_deleted_posts_and_comments(pool: &mut DbPool<'_>) {
   info!("Overwriting deleted posts...");
+  let conn = get_conn(pool).await;
+
+  match conn {
+    Ok(mut conn) => {
       diesel::update(
         post::table
           .filter(post::deleted.eq(true))
@@ -326,7 +344,8 @@ fn overwrite_deleted_posts_and_comments(conn: &mut PgConnection) {
         post::body.eq(DELETED_REPLACEMENT_TEXT),
         post::name.eq(DELETED_REPLACEMENT_TEXT),
       ))
-  .execute(conn)
+      .execute(&mut conn)
+      .await
       .map(|_| {
         info!("Done.");
       })
@@ -341,18 +360,28 @@ fn overwrite_deleted_posts_and_comments(conn: &mut PgConnection) {
           .filter(comment::content.ne(DELETED_REPLACEMENT_TEXT)),
       )
       .set(comment::content.eq(DELETED_REPLACEMENT_TEXT))
-  .execute(conn)
+      .execute(&mut conn)
+      .await
       .map(|_| {
         info!("Done.");
       })
       .map_err(|e| error!("Failed to overwrite deleted comments: {e}"))
       .ok();
+    }
+    Err(e) => {
+      error!("Failed to get connection from pool: {e}");
+    }
+  }
 }
 
 /// Re-calculate the site and community active counts every 12 hours
-fn active_counts(conn: &mut PgConnection) {
+async fn active_counts(pool: &mut DbPool<'_>) {
   info!("Updating active site and community aggregates ...");
 
+  let conn = get_conn(pool).await;
+
+  match conn {
+    Ok(mut conn) => {
       let intervals = vec![
         ("1 day", "day"),
         ("1 week", "week"),
@@ -366,56 +395,72 @@ fn active_counts(conn: &mut PgConnection) {
       i.1, i.0
     );
         sql_query(update_site_stmt)
-      .execute(conn)
+          .execute(&mut conn)
+          .await
           .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)
+          .execute(&mut conn)
+          .await
           .map_err(|e| error!("Failed to update community stats: {e}"))
           .ok();
       }
 
       info!("Done.");
+    }
+    Err(e) => {
+      error!("Failed to get connection from pool: {e}");
+    }
+  }
 }
 
 /// Set banned to false after ban expires
-fn update_banned_when_expired(conn: &mut PgConnection) {
+async fn update_banned_when_expired(pool: &mut DbPool<'_>) {
   info!("Updating banned column if it expires ...");
+  let conn = get_conn(pool).await;
 
+  match conn {
+    Ok(mut conn) => {
       diesel::update(
         person::table
           .filter(person::banned.eq(true))
           .filter(person::ban_expires.lt(now().nullable())),
       )
       .set(person::banned.eq(false))
-  .execute(conn)
+      .execute(&mut conn)
+      .await
       .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().nullable())),
       )
-  .execute(conn)
+      .execute(&mut conn)
+      .await
       .map_err(|e| error!("Failed to remove community_ban expired rows: {e}"))
       .ok();
+    }
+    Err(e) => {
+      error!("Failed to get connection from pool: {e}");
+    }
+  }
 }
 
 /// 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<()> {
+async fn update_instance_software(
+  pool: &mut DbPool<'_>,
+  client: &ClientWithMiddleware,
+) -> LemmyResult<()> {
   info!("Updating instances software and versions...");
+  let conn = get_conn(pool).await;
 
-  let client = Client::builder()
-    .user_agent(user_agent)
-    .timeout(REQWEST_TIMEOUT)
-    .connect_timeout(REQWEST_TIMEOUT)
-    .build()?;
-
-  let instances = instance::table.get_results::<Instance>(conn)?;
+  match conn {
+    Ok(mut conn) => {
+      let instances = instance::table.get_results::<Instance>(&mut conn).await?;
 
       for instance in instances {
         let node_info_url = format!("https://{}/nodeinfo/2.0.json", instance.domain);
@@ -428,12 +473,12 @@ fn update_instance_software(conn: &mut PgConnection, user_agent: &str) -> LemmyR
           .domain(instance.domain.clone())
           .updated(Some(naive_now()))
           .build();
-    let form = match client.get(&node_info_url).send() {
+        let form = match client.get(&node_info_url).send().await {
           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(res) => match res.json::<NodeInfo>().await {
             Ok(node_info) => {
               // Instance sent valid nodeinfo, write it to db
               let software = node_info.software.as_ref();
@@ -459,10 +504,16 @@ fn update_instance_software(conn: &mut PgConnection, user_agent: &str) -> LemmyR
         if let Some(form) = form {
           diesel::update(instance::table.find(instance.id))
             .set(form)
-        .execute(conn)?;
+            .execute(&mut conn)
+            .await?;
         }
       }
       info!("Finished updating instances software and versions...");
+    }
+    Err(e) => {
+      error!("Failed to get connection from pool: {e}");
+    }
+  }
   Ok(())
 }