implement index delete

src/data/updates.rs

@@ -51,12 +51,10 @@ impl Data {
 
     pub async fn delete_index(
         &self,
-        _index: impl AsRef<str> + Send + Sync + 'static,
+        index: impl AsRef<str> + Send + Sync + 'static,
     ) -> anyhow::Result<()> {
-        todo!()
+        self.index_controller.delete_index(index.as_ref().to_owned()).await?;
-        //let index_controller = self.index_controller.clone();
+        Ok(())
-        //tokio::task::spawn_blocking(move || { index_controller.delete_index(index) }).await??;
-        //Ok(())
     }
 
     pub async fn get_update_status(&self, index: impl AsRef<str>, uid: u64) -> anyhow::Result<Option<UpdateStatus>> {

src/index_controller/index_actor.rs

@@ -1,19 +1,20 @@
 use std::collections::{hash_map::Entry, HashMap};
-use std::fs::{create_dir_all, File};
+use std::fs::{create_dir_all, File, remove_dir_all};
 use std::path::{Path, PathBuf};
 use std::sync::Arc;
 
 use async_stream::stream;
 use chrono::Utc;
+use futures::pin_mut;
 use futures::stream::StreamExt;
 use heed::EnvOpenOptions;
 use log::info;
+use std::future::Future;
 use thiserror::Error;
 use tokio::sync::{mpsc, oneshot, RwLock};
 use uuid::Uuid;
-use std::future::Future;
-use futures::pin_mut;
 
+use super::get_arc_ownership_blocking;
 use super::update_handler::UpdateHandler;
 use crate::index::UpdateResult as UResult;
 use crate::index::{Document, Index, SearchQuery, SearchResult, Settings};
@@ -59,7 +60,11 @@ enum IndexMsg {
         attributes_to_retrieve: Option<Vec<String>>,
         doc_id: String,
         ret: oneshot::Sender<Result<Document>>,
-    }
+    },
+    Delete {
+        uuid: Uuid,
+        ret: oneshot::Sender<Result<()>>,
+    },
 }
 
 struct IndexActor<S> {
@@ -82,13 +87,14 @@ trait IndexStore {
     async fn create_index(&self, uuid: Uuid, primary_key: Option<String>) -> Result<IndexMetadata>;
     async fn get_or_create(&self, uuid: Uuid) -> Result<Index>;
     async fn get(&self, uuid: Uuid) -> Result<Option<Index>>;
+    async fn delete(&self, uuid: &Uuid) -> Result<Option<Index>>;
 }
 
 impl<S: IndexStore + Sync + Send> IndexActor<S> {
     fn new(
         read_receiver: mpsc::Receiver<IndexMsg>,
         write_receiver: mpsc::Receiver<IndexMsg>,
-        store: S
+        store: S,
     ) -> Self {
         let options = IndexerOpts::default();
         let update_handler = UpdateHandler::new(&options).unwrap();
@@ -149,7 +155,6 @@ impl<S: IndexStore + Sync + Send> IndexActor<S> {
         //futures.push(fut2);
         //futures.for_each(f)
         tokio::join!(fut1, fut2);
-
     }
 
     async fn handle_message(&self, msg: IndexMsg) {
@@ -173,7 +178,18 @@ impl<S: IndexStore + Sync + Send> IndexActor<S> {
                 self.handle_fetch_documents(uuid, offset, limit, attributes_to_retrieve, ret)
                     .await
             }
-            Document { uuid, attributes_to_retrieve, doc_id, ret } => self.handle_fetch_document(uuid, doc_id, attributes_to_retrieve, ret).await,
+            Document {
+                uuid,
+                attributes_to_retrieve,
+                doc_id,
+                ret,
+            } => {
+                self.handle_fetch_document(uuid, doc_id, attributes_to_retrieve, ret)
+                    .await
+            }
+            Delete { uuid, ret } => {
+                let _ = ret.send(self.handle_delete(uuid).await);
+            },
         }
     }
 
@@ -236,10 +252,12 @@ impl<S: IndexStore + Sync + Send> IndexActor<S> {
     ) {
         let index = self.store.get(uuid).await.unwrap().unwrap();
         tokio::task::spawn_blocking(move || {
-            let result = index.retrieve_documents(offset, limit, attributes_to_retrieve)
+            let result = index
+                .retrieve_documents(offset, limit, attributes_to_retrieve)
                 .map_err(|e| IndexError::Error(e));
             let _ = ret.send(result);
-        }).await;
+        })
+        .await;
     }
 
     async fn handle_fetch_document(
@@ -251,10 +269,29 @@ impl<S: IndexStore + Sync + Send> IndexActor<S> {
     ) {
         let index = self.store.get(uuid).await.unwrap().unwrap();
         tokio::task::spawn_blocking(move || {
-            let result = index.retrieve_document(doc_id, attributes_to_retrieve)
+            let result = index
+                .retrieve_document(doc_id, attributes_to_retrieve)
                 .map_err(|e| IndexError::Error(e));
             let _ = ret.send(result);
-        }).await;
+        })
+        .await;
+    }
+
+    async fn handle_delete(&self, uuid: Uuid) -> Result<()> {
+        let index = self.store.delete(&uuid).await?;
+
+        if let Some(index) = index {
+            tokio::task::spawn(async move {
+                let index = index.0;
+                let store = get_arc_ownership_blocking(index).await;
+                tokio::task::spawn_blocking(move || {
+                    store.prepare_for_closing().wait();
+                    info!("Index {} was closed.", uuid);
+                });
+            });
+        }
+
+        Ok(())
     }
 }
 
@@ -272,7 +309,10 @@ impl IndexActorHandle {
         let store = MapIndexStore::new(path);
         let actor = IndexActor::new(read_receiver, write_receiver, store);
         tokio::task::spawn(actor.run());
-        Self { read_sender, write_sender }
+        Self {
+            read_sender,
+            write_sender,
+        }
     }
 
     pub async fn create_index(
@@ -346,6 +386,13 @@ impl IndexActorHandle {
         let _ = self.read_sender.send(msg).await;
         Ok(receiver.await.expect("IndexActor has been killed")?)
     }
+
+    pub async fn delete(&self, uuid: Uuid) -> Result<()> {
+        let (ret, receiver) = oneshot::channel();
+        let msg = IndexMsg::Delete { uuid, ret };
+        let _ = self.read_sender.send(msg).await;
+        Ok(receiver.await.expect("IndexActor has been killed")?)
+    }
 }
 
 struct MapIndexStore {
@@ -408,6 +455,15 @@ impl IndexStore for MapIndexStore {
     async fn get(&self, uuid: Uuid) -> Result<Option<Index>> {
         Ok(self.index_store.read().await.get(&uuid).cloned())
     }
+
+    async fn delete(&self, uuid: &Uuid) -> Result<Option<Index>> {
+        let index = self.index_store.write().await.remove(&uuid);
+        if index.is_some() {
+            let db_path = self.root.join(format!("index-{}", uuid));
+            remove_dir_all(db_path).unwrap();
+        }
+        Ok(index)
+    }
 }
 
 impl MapIndexStore {

src/index_controller/mod.rs

@@ -1,11 +1,13 @@
-mod updates;
 mod index_actor;
 mod update_actor;
-mod uuid_resolver;
-mod update_store;
 mod update_handler;
+mod update_store;
+mod updates;
+mod uuid_resolver;
 
 use std::path::Path;
+use std::sync::Arc;
+use std::time::Duration;
 
 use actix_web::web::{Bytes, Payload};
 use anyhow::Context;
@@ -14,6 +16,7 @@ use futures::stream::StreamExt;
 use milli::update::{IndexDocumentsMethod, UpdateFormat};
 use serde::{Serialize, Deserialize};
 use tokio::sync::{mpsc, oneshot};
+use tokio::time::sleep;
 use uuid::Uuid;
 
 pub use updates::{Processed, Processing, Failed};
@@ -146,8 +149,14 @@ impl IndexController {
         Ok(index_meta)
     }
 
-    fn delete_index(&self, index_uid: String) -> anyhow::Result<()> {
+    pub async fn delete_index(&self, index_uid: String) -> anyhow::Result<()> {
-        todo!()
+        let uuid = self.uuid_resolver
+            .delete(index_uid)
+            .await?
+            .context("index not found")?;
+        self.update_handle.delete(uuid.clone()).await?;
+        self.index_handle.delete(uuid).await?;
+        Ok(())
     }
 
     pub async fn update_status(&self, index: String, id: u64) -> anyhow::Result<Option<UpdateStatus>> {
@@ -219,3 +228,16 @@ impl IndexController {
         Ok(result)
     }
 }
+
+pub async fn get_arc_ownership_blocking<T>(mut item: Arc<T>) -> T {
+    loop {
+        match Arc::try_unwrap(item) {
+            Ok(item) => return item,
+            Err(item_arc) => {
+                item = item_arc;
+                sleep(Duration::from_millis(100)).await;
+                continue;
+            }
+        }
+    }
+}

src/index_controller/update_actor.rs

@@ -1,19 +1,20 @@
 use std::collections::{hash_map::Entry, HashMap};
-use std::fs::create_dir_all;
+use std::fs::{create_dir_all, remove_dir_all};
 use std::path::{Path, PathBuf};
 use std::sync::Arc;
 
-use super::index_actor::IndexActorHandle;
+use itertools::Itertools;
 use log::info;
+use super::index_actor::IndexActorHandle;
 use thiserror::Error;
 use tokio::fs::File;
 use tokio::io::AsyncWriteExt;
 use tokio::sync::{mpsc, oneshot, RwLock};
 use uuid::Uuid;
-use itertools::Itertools;
 
 use crate::index::UpdateResult;
 use crate::index_controller::{UpdateMeta, UpdateStatus};
+use super::get_arc_ownership_blocking;
 
 pub type Result<T> = std::result::Result<T, UpdateError>;
 type UpdateStore = super::update_store::UpdateStore<UpdateMeta, UpdateResult, String>;
@@ -42,7 +43,11 @@ enum UpdateMsg<D> {
         uuid: Uuid,
         ret: oneshot::Sender<Result<Option<UpdateStatus>>>,
         id: u64,
-    }
+    },
+    Delete {
+        uuid: Uuid,
+        ret: oneshot::Sender<Result<()>>,
+    },
 }
 
 struct UpdateActor<D, S> {
@@ -54,6 +59,7 @@ struct UpdateActor<D, S> {
 #[async_trait::async_trait]
 trait UpdateStoreStore {
     async fn get_or_create(&self, uuid: Uuid) -> Result<Arc<UpdateStore>>;
+    async fn delete(&self, uuid: &Uuid) -> Result<Option<Arc<UpdateStore>>>;
     async fn get(&self, uuid: &Uuid) -> Result<Option<Arc<UpdateStore>>>;
 }
 
@@ -89,6 +95,9 @@ where
                 Some(GetUpdate { uuid, ret, id }) => {
                     let _ = ret.send(self.handle_get_update(uuid, id).await);
                 }
+                Some(Delete { uuid, ret }) => {
+                    let _ = ret.send(self.handle_delete(uuid).await);
+                }
                 None => {}
             }
         }
@@ -173,6 +182,24 @@ where
             .map_err(|e| UpdateError::Error(Box::new(e)))?;
         Ok(result)
     }
+
+    async fn handle_delete(&self, uuid: Uuid) -> Result<()> {
+        let store = self.store
+            .delete(&uuid)
+            .await?;
+
+        if let Some(store) = store {
+            tokio::task::spawn(async move {
+                let store = get_arc_ownership_blocking(store).await;
+                tokio::task::spawn_blocking(move || {
+                    store.prepare_for_closing().wait();
+                    info!("Update store {} was closed.", uuid);
+                });
+            });
+        }
+
+        Ok(())
+    }
 }
 
 #[derive(Clone)]
@@ -225,6 +252,13 @@ where
         let _ = self.sender.send(msg).await;
         receiver.await.expect("update actor killed.")
     }
+
+    pub async fn delete(&self, uuid: Uuid) -> Result<()> {
+        let (ret, receiver) = oneshot::channel();
+        let msg = UpdateMsg::Delete { uuid, ret };
+        let _ = self.sender.send(msg).await;
+        receiver.await.expect("update actor killed.")
+    }
 }
 
 struct MapUpdateStoreStore {
@@ -269,4 +303,13 @@ impl UpdateStoreStore for MapUpdateStoreStore {
     async fn get(&self, uuid: &Uuid) -> Result<Option<Arc<UpdateStore>>> {
         Ok(self.db.read().await.get(uuid).cloned())
     }
+
+    async fn delete(&self, uuid: &Uuid) -> Result<Option<Arc<UpdateStore>>> {
+        let store = self.db.write().await.remove(&uuid);
+        if store.is_some() {
+            let path = self.path.clone().join(format!("updates-{}", uuid));
+            remove_dir_all(path).unwrap();
+        }
+        Ok(store)
+    }
 }

src/index_controller/uuid_resolver.rs

@@ -22,6 +22,10 @@ enum UuidResolveMsg {
         name: String,
         ret: oneshot::Sender<Result<Uuid>>,
     },
+    Delete {
+        name: String,
+        ret: oneshot::Sender<Result<Option<Uuid>>>,
+    },
 }
 
 struct UuidResolverActor<S> {
@@ -45,6 +49,7 @@ impl<S: UuidStore> UuidResolverActor<S> {
                 Some(Create { name, ret }) => self.handle_create(name, ret).await,
                 Some(GetOrCreate { name, ret }) => self.handle_get_or_create(name, ret).await,
                 Some(Resolve { name, ret }) => self.handle_resolve(name, ret).await,
+                Some(Delete { name, ret }) => self.handle_delete(name, ret).await,
                 // all senders have been dropped, need to quit.
                 None => break,
             }
@@ -64,7 +69,12 @@ impl<S: UuidStore> UuidResolverActor<S> {
     }
 
     async fn handle_resolve(&self, name: String, ret: oneshot::Sender<Result<Option<Uuid>>>) {
-        let result = self.store.get_uuid(name).await;
+        let result = self.store.get_uuid(&name).await;
+        let _ = ret.send(result);
+    }
+
+    async fn handle_delete(&self, name: String, ret: oneshot::Sender<Result<Option<Uuid>>>) {
+        let result = self.store.delete(&name).await;
         let _ = ret.send(result);
     }
 }
@@ -103,6 +113,13 @@ impl UuidResolverHandle {
         let _ = self.sender.send(msg).await;
         Ok(receiver.await.expect("Uuid resolver actor has been killed")?)
     }
+
+    pub async fn delete(&self, name: String) -> anyhow::Result<Option<Uuid>> {
+        let (ret, receiver) = oneshot::channel();
+        let msg = UuidResolveMsg::Delete { name, ret };
+        let _ = self.sender.send(msg).await;
+        Ok(receiver.await.expect("Uuid resolver actor has been killed")?)
+    }
 }
 
 #[derive(Clone, Debug, Error)]
@@ -116,7 +133,8 @@ trait UuidStore {
     // Create a new entry for `name`. Return an error if `err` and the entry already exists, return
     // the uuid otherwise.
     async fn create_uuid(&self, name: String, err: bool) -> Result<Uuid>;
-    async fn get_uuid(&self, name: String) -> Result<Option<Uuid>>;
+    async fn get_uuid(&self, name: &str) -> Result<Option<Uuid>>;
+    async fn delete(&self, name: &str) -> Result<Option<Uuid>>;
 }
 
 struct MapUuidStore(Arc<RwLock<HashMap<String, Uuid>>>);
@@ -140,7 +158,11 @@ impl UuidStore for MapUuidStore {
         }
     }
 
-    async fn get_uuid(&self, name: String) -> Result<Option<Uuid>> {
+    async fn get_uuid(&self, name: &str) -> Result<Option<Uuid>> {
-        Ok(self.0.read().await.get(&name).cloned())
+        Ok(self.0.read().await.get(name).cloned())
+    }
+
+    async fn delete(&self, name: &str) -> Result<Option<Uuid>> {
+        Ok(self.0.write().await.remove(name))
     }
 }