Enable at-most-once queueing for some cleanup jobs

src/queue.rs

@@ -22,6 +22,10 @@ mod process;
 
 const CLEANUP_QUEUE: &str = "cleanup";
 const PROCESS_QUEUE: &str = "process";
+const OUTDATED_PROXIES_UNIQUE_KEY: &str = "outdated-proxies";
+const OUTDATED_VARIANTS_UNIQUE_KEY: &str = "outdated-variants";
+const ALL_VARIANTS_UNIQUE_KEY: &str = "all-variants";
+const PRUNE_MISSING_UNIQUE_KEY: &str = "prune-missing";
 
 #[derive(Debug, serde::Deserialize, serde::Serialize)]
 enum Cleanup {
@@ -71,13 +75,13 @@ pub(crate) async fn cleanup_alias(
         token: Serde::new(token),
     })
     .map_err(UploadError::PushJob)?;
-    repo.push(CLEANUP_QUEUE, job).await?;
+    repo.push(CLEANUP_QUEUE, job, None).await?;
     Ok(())
 }
 
 pub(crate) async fn cleanup_hash(repo: &ArcRepo, hash: Hash) -> Result<(), Error> {
     let job = serde_json::to_value(Cleanup::Hash { hash }).map_err(UploadError::PushJob)?;
-    repo.push(CLEANUP_QUEUE, job).await?;
+    repo.push(CLEANUP_QUEUE, job, None).await?;
     Ok(())
 }
 
@@ -86,7 +90,7 @@ pub(crate) async fn cleanup_identifier(repo: &ArcRepo, identifier: &Arc<str>) ->
         identifier: identifier.to_string(),
     })
     .map_err(UploadError::PushJob)?;
-    repo.push(CLEANUP_QUEUE, job).await?;
+    repo.push(CLEANUP_QUEUE, job, None).await?;
     Ok(())
 }
 
@@ -97,31 +101,55 @@ async fn cleanup_variants(
 ) -> Result<(), Error> {
     let job =
         serde_json::to_value(Cleanup::Variant { hash, variant }).map_err(UploadError::PushJob)?;
-    repo.push(CLEANUP_QUEUE, job).await?;
+    repo.push(CLEANUP_QUEUE, job, None).await?;
     Ok(())
 }
 
 pub(crate) async fn cleanup_outdated_proxies(repo: &ArcRepo) -> Result<(), Error> {
     let job = serde_json::to_value(Cleanup::OutdatedProxies).map_err(UploadError::PushJob)?;
-    repo.push(CLEANUP_QUEUE, job).await?;
+    if repo
+        .push(CLEANUP_QUEUE, job, Some(OUTDATED_PROXIES_UNIQUE_KEY))
+        .await?
+        .is_none()
+    {
+        tracing::debug!("outdated proxies conflict");
+    }
     Ok(())
 }
 
 pub(crate) async fn cleanup_outdated_variants(repo: &ArcRepo) -> Result<(), Error> {
     let job = serde_json::to_value(Cleanup::OutdatedVariants).map_err(UploadError::PushJob)?;
-    repo.push(CLEANUP_QUEUE, job).await?;
+    if repo
+        .push(CLEANUP_QUEUE, job, Some(OUTDATED_VARIANTS_UNIQUE_KEY))
+        .await?
+        .is_none()
+    {
+        tracing::debug!("outdated variants conflict");
+    }
     Ok(())
 }
 
 pub(crate) async fn cleanup_all_variants(repo: &ArcRepo) -> Result<(), Error> {
     let job = serde_json::to_value(Cleanup::AllVariants).map_err(UploadError::PushJob)?;
-    repo.push(CLEANUP_QUEUE, job).await?;
+    if repo
+        .push(CLEANUP_QUEUE, job, Some(ALL_VARIANTS_UNIQUE_KEY))
+        .await?
+        .is_none()
+    {
+        tracing::debug!("all variants conflict");
+    }
     Ok(())
 }
 
 pub(crate) async fn prune_missing(repo: &ArcRepo) -> Result<(), Error> {
     let job = serde_json::to_value(Cleanup::Prune).map_err(UploadError::PushJob)?;
-    repo.push(CLEANUP_QUEUE, job).await?;
+    if repo
+        .push(CLEANUP_QUEUE, job, Some(PRUNE_MISSING_UNIQUE_KEY))
+        .await?
+        .is_none()
+    {
+        tracing::debug!("prune missing conflict");
+    }
     Ok(())
 }
 
@@ -137,7 +165,7 @@ pub(crate) async fn queue_ingest(
         upload_id: Serde::new(upload_id),
     })
     .map_err(UploadError::PushJob)?;
-    repo.push(PROCESS_QUEUE, job).await?;
+    repo.push(PROCESS_QUEUE, job, None).await?;
     Ok(())
 }
 
@@ -155,7 +183,7 @@ pub(crate) async fn queue_generate(
         process_args,
     })
     .map_err(UploadError::PushJob)?;
-    repo.push(PROCESS_QUEUE, job).await?;
+    repo.push(PROCESS_QUEUE, job, None).await?;
     Ok(())
 }
 

src/repo.rs

@@ -353,7 +353,12 @@ impl JobId {
 
 #[async_trait::async_trait(?Send)]
 pub(crate) trait QueueRepo: BaseRepo {
-    async fn push(&self, queue: &'static str, job: serde_json::Value) -> Result<JobId, RepoError>;
+    async fn push(
+        &self,
+        queue: &'static str,
+        job: serde_json::Value,
+        unique_key: Option<&'static str>,
+    ) -> Result<Option<JobId>, RepoError>;
 
     async fn pop(
         &self,
@@ -381,8 +386,13 @@ impl<T> QueueRepo for Arc<T>
 where
     T: QueueRepo,
 {
-    async fn push(&self, queue: &'static str, job: serde_json::Value) -> Result<JobId, RepoError> {
-        T::push(self, queue, job).await
+    async fn push(
+        &self,
+        queue: &'static str,
+        job: serde_json::Value,
+        unique_key: Option<&'static str>,
+    ) -> Result<Option<JobId>, RepoError> {
+        T::push(self, queue, job, unique_key).await
     }
 
     async fn pop(

src/repo/postgres.rs

@@ -1223,26 +1223,41 @@ impl QueueRepo for PostgresRepo {
         &self,
         queue_name: &'static str,
         job_json: serde_json::Value,
-    ) -> Result<JobId, RepoError> {
+        in_unique_key: Option<&'static str>,
+    ) -> Result<Option<JobId>, RepoError> {
         let guard = PushMetricsGuard::guard(queue_name);
 
         use schema::job_queue::dsl::*;
 
         let mut conn = self.get_connection().await?;
 
-        let job_id = diesel::insert_into(job_queue)
-            .values((queue.eq(queue_name), job.eq(job_json)))
+        let res = diesel::insert_into(job_queue)
+            .values((
+                queue.eq(queue_name),
+                job.eq(job_json),
+                unique_key.eq(in_unique_key),
+            ))
             .returning(id)
             .get_result::<Uuid>(&mut conn)
             .with_metrics("pict-rs.postgres.queue.push")
             .with_timeout(Duration::from_secs(5))
             .await
             .map_err(|_| PostgresError::DbTimeout)?
-            .map_err(PostgresError::Diesel)?;
+            .map(JobId)
+            .map(Some);
 
+        match res {
+            Ok(job_id) => {
                 guard.disarm();
 
-        Ok(JobId(job_id))
+                Ok(job_id)
+            }
+            Err(diesel::result::Error::DatabaseError(
+                diesel::result::DatabaseErrorKind::UniqueViolation,
+                _,
+            )) => Ok(None),
+            Err(e) => Err(RepoError::from(PostgresError::Diesel(e))),
+        }
     }
 
     #[tracing::instrument(level = "debug", skip(self))]

src/repo/postgres/migrations/V0011__add_unique_name_jobs.rs

@@ -0,0 +1,15 @@
+use barrel::backend::Pg;
+use barrel::{types, Migration};
+
+pub(crate) fn migration() -> String {
+    let mut m = Migration::new();
+
+    m.change_table("job_queue", |t| {
+        t.add_column(
+            "unique_key",
+            types::text().size(50).nullable(true).unique(true),
+        );
+    });
+
+    m.make::<Pg>().to_string()
+}

src/repo/postgres/schema.rs

@@ -42,6 +42,7 @@ diesel::table! {
         status -> JobStatus,
         queue_time -> Timestamp,
         heartbeat -> Nullable<Timestamp>,
+        unique_key -> Nullable<Text>,
     }
 }
 

src/repo/sled.rs

@@ -95,6 +95,8 @@ pub(crate) struct SledRepo {
     alias_hashes: Tree,
     alias_delete_tokens: Tree,
     queue: Tree,
+    unique_jobs: Tree,
+    unique_jobs_inverse: Tree,
     job_state: Tree,
     alias_access: Tree,
     inverse_alias_access: Tree,
@@ -134,6 +136,8 @@ impl SledRepo {
             alias_hashes: db.open_tree("pict-rs-alias-hashes-tree")?,
             alias_delete_tokens: db.open_tree("pict-rs-alias-delete-tokens-tree")?,
             queue: db.open_tree("pict-rs-queue-tree")?,
+            unique_jobs: db.open_tree("pict-rs-unique-jobs-tree")?,
+            unique_jobs_inverse: db.open_tree("pict-rs-unique-jobs-inverse-tree")?,
             job_state: db.open_tree("pict-rs-job-state-tree")?,
             alias_access: db.open_tree("pict-rs-alias-access-tree")?,
             inverse_alias_access: db.open_tree("pict-rs-inverse-alias-access-tree")?,
@@ -625,7 +629,8 @@ impl QueueRepo for SledRepo {
         &self,
         queue_name: &'static str,
         job: serde_json::Value,
-    ) -> Result<JobId, RepoError> {
+        unique_key: Option<&'static str>,
+    ) -> Result<Option<JobId>, RepoError> {
         let metrics_guard = PushMetricsGuard::guard(queue_name);
 
         let id = JobId::gen();
@@ -633,29 +638,45 @@ impl QueueRepo for SledRepo {
         let job = serde_json::to_vec(&job).map_err(SledError::Job)?;
 
         let queue = self.queue.clone();
+        let unique_jobs = self.unique_jobs.clone();
+        let unique_jobs_inverse = self.unique_jobs_inverse.clone();
         let job_state = self.job_state.clone();
 
         let res = crate::sync::spawn_blocking("sled-io", move || {
-            (&queue, &job_state).transaction(|(queue, job_state)| {
+            (&queue, &unique_jobs, &unique_jobs_inverse, &job_state).transaction(
+                |(queue, unique_jobs, unique_jobs_inverse, job_state)| {
                     let state = JobState::pending();
 
                     queue.insert(&key[..], &job[..])?;
+                    if let Some(unique_key) = unique_key {
+                        if unique_jobs
+                            .insert(unique_key.as_bytes(), &key[..])?
+                            .is_some()
+                        {
+                            return sled::transaction::abort(());
+                        }
+
+                        unique_jobs_inverse.insert(&key[..], unique_key.as_bytes())?;
+                    }
                     job_state.insert(&key[..], state.as_bytes())?;
 
                     Ok(())
-            })
+                },
+            )
         })
         .await
         .map_err(|_| RepoError::Canceled)?;
 
-        if let Err(TransactionError::Abort(e) | TransactionError::Storage(e)) = res {
-            return Err(RepoError::from(SledError::from(e)));
+        match res {
+            Err(TransactionError::Abort(())) => return Ok(None),
+            Err(TransactionError::Storage(e)) => return Err(RepoError::from(SledError::from(e))),
+            Ok(()) => (),
         }
 
         if let Some(notifier) = self.queue_notifier.read().unwrap().get(&queue_name) {
             notifier.notify_one();
             metrics_guard.disarm();
-            return Ok(id);
+            return Ok(Some(id));
         }
 
         self.queue_notifier
@@ -667,7 +688,7 @@ impl QueueRepo for SledRepo {
 
         metrics_guard.disarm();
 
-        Ok(id)
+        Ok(Some(id))
     }
 
     #[tracing::instrument(skip(self, worker_id), fields(job_id))]
@@ -808,14 +829,21 @@ impl QueueRepo for SledRepo {
         let key = job_key(queue_name, job_id);
 
         let queue = self.queue.clone();
+        let unique_jobs = self.unique_jobs.clone();
+        let unique_jobs_inverse = self.unique_jobs_inverse.clone();
         let job_state = self.job_state.clone();
 
         let res = crate::sync::spawn_blocking("sled-io", move || {
-            (&queue, &job_state).transaction(|(queue, job_state)| {
+            (&queue, &unique_jobs, &unique_jobs_inverse, &job_state).transaction(
+                |(queue, unique_jobs, unique_jobs_inverse, job_state)| {
                     queue.remove(&key[..])?;
+                    if let Some(unique_key) = unique_jobs_inverse.remove(&key[..])? {
+                        unique_jobs.remove(unique_key)?;
+                    }
                     job_state.remove(&key[..])?;
                     Ok(())
-            })
+                },
+            )
         })
         .await
         .map_err(|_| RepoError::Canceled)?;