make Task index_uid an option

Not all task relate to an index. Tasks that don't have an index_uid set
to None

meilisearch-http/src/task.rs

@@ -137,7 +137,7 @@ fn serialize_duration<S: Serializer>(
 #[serde(rename_all = "camelCase")]
 pub struct TaskView {
     uid: TaskId,
-    index_uid: String,
+    index_uid: Option<String>,
     status: TaskStatus,
     #[serde(rename = "type")]
     task_type: TaskType,
@@ -313,7 +313,7 @@ impl From<Task> for TaskView {
 
         Self {
             uid: id,
-            index_uid: index_uid.into_inner(),
+            index_uid: index_uid.map(|u| u.into_inner()),
             status,
             task_type,
             details,
@@ -342,7 +342,7 @@ impl From<Vec<TaskView>> for TaskListView {
 #[serde(rename_all = "camelCase")]
 pub struct SummarizedTaskView {
     uid: TaskId,
-    index_uid: String,
+    index_uid: Option<String>,
     status: TaskStatus,
     #[serde(rename = "type")]
     task_type: TaskType,
@@ -365,7 +365,7 @@ impl From<Task> for SummarizedTaskView {
 
         Self {
             uid: other.id,
-            index_uid: other.index_uid.to_string(),
+            index_uid: other.index_uid.map(|u| u.into_inner()),
             status: TaskStatus::Enqueued,
             task_type: other.content.into(),
             enqueued_at,

meilisearch-lib/src/index_controller/dump_actor/compat/v3.rs

@@ -187,7 +187,7 @@ impl From<(UpdateStatus, String, TaskId)> for Task {
         // Dummy task
         let mut task = Task {
             id: task_id,
-            index_uid: IndexUid::new(uid).unwrap(),
+            index_uid: Some(IndexUid::new(uid).unwrap()),
             content: TaskContent::IndexDeletion,
             events: Vec::new(),
         };

meilisearch-lib/src/index_controller/mod.rs

@@ -419,7 +419,7 @@ where
             Update::UpdateIndex { primary_key } => TaskContent::IndexUpdate { primary_key },
         };
 
-        let task = self.task_store.register(uid, content).await?;
+        let task = self.task_store.register(Some(uid), content).await?;
         self.scheduler.read().await.notify();
 
         Ok(task)
@@ -569,7 +569,12 @@ where
         // Check if the currently indexing update is from our index.
         let is_indexing = processing_tasks
             .first()
-            .map(|task| task.index_uid.as_str() == uid)
+            .map(|task| {
+                task.index_uid
+                    .as_ref()
+                    .map(|u| u.as_str() == uid)
+                    .unwrap_or(false)
+            })
             .unwrap_or_default();
 
         let index = self.index_resolver.get_index(uid).await?;
@@ -605,7 +610,7 @@ where
             // Check if the currently indexing update is from our index.
             stats.is_indexing = processing_tasks
                 .first()
-                .map(|p| p.index_uid.as_str() == index_uid)
+                .and_then(|p| p.index_uid.as_ref().map(|u| u.as_str() == index_uid))
                 .or(Some(false));
 
             indexes.insert(index_uid, stats);

meilisearch-lib/src/index_resolver/mod.rs

@@ -204,7 +204,7 @@ where
 
         match batch.tasks.first() {
             Some(Task {
-                index_uid,
+                index_uid: Some(ref index_uid),
                 id,
                 content:
                     TaskContent::DocumentAddition {
@@ -285,7 +285,7 @@ where
             TaskContent::DocumentAddition { .. } => panic!("updates should be handled by batch"),
             TaskContent::DocumentDeletion(DocumentDeletion::Ids(ids)) => {
                 let ids = ids.clone();
-                let index = self.get_index(index_uid.into_inner()).await?;
+                let index = self.get_index(index_uid.unwrap().into_inner()).await?;
 
                 let DocumentDeletionResult {
                     deleted_documents, ..
@@ -294,7 +294,7 @@ where
                 Ok(TaskResult::DocumentDeletion { deleted_documents })
             }
             TaskContent::DocumentDeletion(DocumentDeletion::Clear) => {
-                let index = self.get_index(index_uid.into_inner()).await?;
+                let index = self.get_index(index_uid.unwrap().into_inner()).await?;
                 let deleted_documents = spawn_blocking(move || -> IndexResult<u64> {
                     let number_documents = index.stats()?.number_of_documents;
                     index.clear_documents()?;
@@ -310,9 +310,10 @@ where
                 allow_index_creation,
             } => {
                 let index = if *is_deletion || !*allow_index_creation {
-                    self.get_index(index_uid.into_inner()).await?
+                    self.get_index(index_uid.unwrap().into_inner()).await?
                 } else {
-                    self.get_or_create_index(index_uid, task.id).await?
+                    self.get_or_create_index(index_uid.unwrap(), task.id)
+                        .await?
                 };
 
                 let settings = settings.clone();
@@ -321,7 +322,7 @@ where
                 Ok(TaskResult::Other)
             }
             TaskContent::IndexDeletion => {
-                let index = self.delete_index(index_uid.into_inner()).await?;
+                let index = self.delete_index(index_uid.unwrap().into_inner()).await?;
 
                 let deleted_documents = spawn_blocking(move || -> IndexResult<u64> {
                     Ok(index.stats()?.number_of_documents)
@@ -331,7 +332,7 @@ where
                 Ok(TaskResult::ClearAll { deleted_documents })
             }
             TaskContent::IndexCreation { primary_key } => {
-                let index = self.create_index(index_uid, task.id).await?;
+                let index = self.create_index(index_uid.unwrap(), task.id).await?;
 
                 if let Some(primary_key) = primary_key {
                     let primary_key = primary_key.clone();
@@ -341,7 +342,7 @@ where
                 Ok(TaskResult::Other)
             }
             TaskContent::IndexUpdate { primary_key } => {
-                let index = self.get_index(index_uid.into_inner()).await?;
+                let index = self.get_index(index_uid.unwrap().into_inner()).await?;
 
                 if let Some(primary_key) = primary_key {
                     let primary_key = primary_key.clone();
@@ -503,7 +504,7 @@ mod test {
     proptest! {
         #[test]
         fn test_process_task(
-            task in any::<Task>(),
+            task in any::<Task>().prop_filter("uid must be Some", |t| t.index_uid.is_some()),
             index_exists in any::<bool>(),
             index_op_fails in any::<bool>(),
             any_int in any::<u64>(),

meilisearch-lib/src/tasks/scheduler.rs

@@ -125,7 +125,8 @@ struct TaskQueue {
 
 impl TaskQueue {
     fn insert(&mut self, task: Task) {
-        let uid = task.index_uid.into_inner();
+        // TODO(marin): The index uid should be remaped to a task queue identifier here
+        let uid = task.index_uid.unwrap().into_inner();
         let id = task.id;
         let kind = match task.content {
             TaskContent::DocumentAddition {
@@ -443,7 +444,7 @@ mod test {
     fn gen_task(id: TaskId, index_uid: &str, content: TaskContent) -> Task {
         Task {
             id,
-            index_uid: IndexUid::new_unchecked(index_uid),
+            index_uid: Some(IndexUid::new_unchecked(index_uid)),
             content,
             events: vec![],
         }

meilisearch-lib/src/tasks/task.rs

@@ -74,7 +74,11 @@ pub enum TaskEvent {
 #[cfg_attr(test, derive(proptest_derive::Arbitrary))]
 pub struct Task {
     pub id: TaskId,
-    pub index_uid: IndexUid,
+    /// The name of the index the task is targeting. If it isn't targeting any idex (i.e Dump task)
+    /// then this is None
+    // TODO: when next forward breaking dumps, it would be a good idea to move this field inside of
+    // the TaskContent.
+    pub index_uid: Option<IndexUid>,
     pub content: TaskContent,
     pub events: Vec<TaskEvent>,
 }

meilisearch-lib/src/tasks/task_store/mod.rs

@@ -30,10 +30,14 @@ pub struct TaskFilter {
 
 impl TaskFilter {
     fn pass(&self, task: &Task) -> bool {
-        self.indexes
+        match task.index_uid {
+            Some(ref index_uid) => self
+                .indexes
                 .as_ref()
-            .map(|indexes| indexes.contains(&*task.index_uid))
+                .map(|indexes| indexes.contains(index_uid.as_str()))
-            .unwrap_or(true)
+                .unwrap_or(true),
+            None => false,
+        }
     }
 
     /// Adds an index to the filter, so the filter must match this index.
@@ -66,7 +70,11 @@ impl TaskStore {
         Ok(Self { store })
     }
 
-    pub async fn register(&self, index_uid: IndexUid, content: TaskContent) -> Result<Task> {
+    pub async fn register(
+        &self,
+        index_uid: Option<IndexUid>,
+        content: TaskContent,
+    ) -> Result<Task> {
         debug!("registering update: {:?}", content);
         let store = self.store.clone();
         let task = tokio::task::spawn_blocking(move || -> Result<Task> {
@@ -305,7 +313,11 @@ pub mod test {
             }
         }
 
-        pub async fn register(&self, index_uid: IndexUid, content: TaskContent) -> Result<Task> {
+        pub async fn register(
+            &self,
+            index_uid: Option<IndexUid>,
+            content: TaskContent,
+        ) -> Result<Task> {
             match self {
                 Self::Real(s) => s.register(index_uid, content).await,
                 Self::Mock(_m) => todo!(),
@@ -335,7 +347,7 @@ pub mod test {
 
         let gen_task = |id: TaskId| Task {
             id,
-            index_uid: IndexUid::new_unchecked("test"),
+            index_uid: Some(IndexUid::new_unchecked("test")),
             content: TaskContent::IndexCreation { primary_key: None },
             events: Vec::new(),
         };

meilisearch-lib/src/tasks/task_store/store.rs

@@ -109,7 +109,8 @@ impl Store {
     pub fn put(&self, txn: &mut RwTxn, task: &Task) -> Result<()> {
         self.tasks.put(txn, &BEU64::new(task.id), task)?;
         self.uids_task_ids
-            .put(txn, &(&task.index_uid, task.id), &())?;
+            // TODO(marin): The index uid should be remaped to a task queue identifier here
+            .put(txn, &(&task.index_uid.as_ref().unwrap(), task.id), &())?;
 
         Ok(())
     }
@@ -325,7 +326,7 @@ pub mod test {
         let tasks = (0..100)
             .map(|_| Task {
                 id: rand::random(),
-                index_uid: IndexUid::new_unchecked("test"),
+                index_uid: Some(IndexUid::new_unchecked("test")),
                 content: TaskContent::IndexDeletion,
                 events: vec![],
             })
@@ -356,14 +357,14 @@ pub mod test {
 
         let task_1 = Task {
             id: 1,
-            index_uid: IndexUid::new_unchecked("test"),
+            index_uid: Some(IndexUid::new_unchecked("test")),
             content: TaskContent::IndexDeletion,
             events: vec![],
         };
 
         let task_2 = Task {
             id: 0,
-            index_uid: IndexUid::new_unchecked("test1"),
+            index_uid: Some(IndexUid::new_unchecked("test1")),
             content: TaskContent::IndexDeletion,
             events: vec![],
         };
@@ -379,18 +380,28 @@ pub mod test {
 
         txn.abort().unwrap();
         assert_eq!(tasks.len(), 1);
-        assert_eq!(&*tasks.first().unwrap().index_uid, "test");
+        assert_eq!(
+            tasks
+                .first()
+                .as_ref()
+                .unwrap()
+                .index_uid
+                .as_ref()
+                .unwrap()
+                .as_str(),
+            "test"
+        );
 
         // same thing but invert the ids
         let task_1 = Task {
             id: 0,
-            index_uid: IndexUid::new_unchecked("test"),
+            index_uid: Some(IndexUid::new_unchecked("test")),
             content: TaskContent::IndexDeletion,
             events: vec![],
         };
         let task_2 = Task {
             id: 1,
-            index_uid: IndexUid::new_unchecked("test1"),
+            index_uid: Some(IndexUid::new_unchecked("test1")),
             content: TaskContent::IndexDeletion,
             events: vec![],
         };
@@ -405,7 +416,17 @@ pub mod test {
         let tasks = store.list_tasks(&txn, None, Some(filter), None).unwrap();
 
         assert_eq!(tasks.len(), 1);
-        assert_eq!(&*tasks.first().unwrap().index_uid, "test");
+        assert_eq!(
+            &*tasks
+                .first()
+                .as_ref()
+                .unwrap()
+                .index_uid
+                .as_ref()
+                .unwrap()
+                .as_str(),
+            "test"
+        );
     }
 
     proptest! {