bug(lib): drop env on last use

fixes the `too many open files` error when running tests by closing the
environment on last drop

meilisearch-auth/src/store.rs

@@ -5,6 +5,7 @@ use std::convert::TryInto;
 use std::fs::create_dir_all;
 use std::path::Path;
 use std::str;
+use std::sync::Arc;
 
 use chrono::{DateTime, Utc};
 use heed::types::{ByteSlice, DecodeIgnore, SerdeJson};
@@ -23,11 +24,19 @@ pub type KeyId = [u8; KEY_ID_LENGTH];
 
 #[derive(Clone)]
 pub struct HeedAuthStore {
-    env: Env,
+    env: Arc<Env>,
     keys: Database<ByteSlice, SerdeJson<Key>>,
     action_keyid_index_expiration: Database<KeyIdActionCodec, SerdeJson<Option<DateTime<Utc>>>>,
 }
 
+impl Drop for HeedAuthStore {
+    fn drop(&mut self) {
+        if Arc::strong_count(&self.env) == 1 {
+            self.env.as_ref().clone().prepare_for_closing();
+        }
+    }
+}
+
 impl HeedAuthStore {
     pub fn new(path: impl AsRef<Path>) -> Result<Self> {
         let path = path.as_ref().join(AUTH_DB_PATH);
@@ -35,7 +44,7 @@ impl HeedAuthStore {
         let mut options = EnvOpenOptions::new();
         options.map_size(AUTH_STORE_SIZE); // 1GB
         options.max_dbs(2);
-        let env = options.open(path)?;
+        let env = Arc::new(options.open(path)?);
         let keys = env.create_database(Some(KEY_DB_NAME))?;
         let action_keyid_index_expiration =
             env.create_database(Some(KEY_ID_ACTION_INDEX_EXPIRATION_DB_NAME))?;

meilisearch-lib/src/index_controller/dump_actor/loaders/v4.rs

@@ -1,4 +1,5 @@
 use std::path::Path;
+use std::sync::Arc;
 
 use heed::EnvOpenOptions;
 use log::info;
@@ -26,7 +27,7 @@ pub fn load_dump(
     let mut options = EnvOpenOptions::new();
     options.map_size(meta_env_size);
     options.max_dbs(100);
-    let env = options.open(&dst)?;
+    let env = Arc::new(options.open(&dst)?);
 
     IndexResolver::load_dump(
         src.as_ref(),

meilisearch-lib/src/index_controller/mod.rs

@@ -192,7 +192,7 @@ impl IndexControllerBuilder {
         options.map_size(task_store_size);
         options.max_dbs(20);
 
-        let meta_env = options.open(&db_path)?;
+        let meta_env = Arc::new(options.open(&db_path)?);
 
         let update_file_store = UpdateFileStore::new(&db_path)?;
         // Create or overwrite the version file for this DB

meilisearch-lib/src/index_resolver/meta_store.rs

@@ -2,6 +2,7 @@ use std::collections::HashSet;
 use std::fs::{create_dir_all, File};
 use std::io::{BufRead, BufReader, Write};
 use std::path::{Path, PathBuf};
+use std::sync::Arc;
 
 use heed::types::{SerdeBincode, Str};
 use heed::{CompactionOption, Database, Env};
@@ -42,12 +43,20 @@ pub struct IndexMeta {
 
 #[derive(Clone)]
 pub struct HeedMetaStore {
-    env: Env,
+    env: Arc<Env>,
     db: Database<Str, SerdeBincode<IndexMeta>>,
 }
 
+impl Drop for HeedMetaStore {
+    fn drop(&mut self) {
+        if Arc::strong_count(&self.env) == 1 {
+            self.env.as_ref().clone().prepare_for_closing();
+        }
+    }
+}
+
 impl HeedMetaStore {
-    pub fn new(env: heed::Env) -> Result<Self> {
+    pub fn new(env: Arc<heed::Env>) -> Result<Self> {
         let db = env.create_database(Some("uuids"))?;
         Ok(Self { env, db })
     }
@@ -144,7 +153,7 @@ impl HeedMetaStore {
         Ok(())
     }
 
-    pub fn load_dump(src: impl AsRef<Path>, env: heed::Env) -> Result<()> {
+    pub fn load_dump(src: impl AsRef<Path>, env: Arc<heed::Env>) -> Result<()> {
         let src_indexes = src.as_ref().join(UUIDS_DB_PATH).join("data.jsonl");
         let indexes = File::open(&src_indexes)?;
         let mut indexes = BufReader::new(indexes);

meilisearch-lib/src/index_resolver/mod.rs

@@ -4,6 +4,7 @@ pub mod meta_store;
 
 use std::convert::TryInto;
 use std::path::Path;
+use std::sync::Arc;
 
 use chrono::Utc;
 use error::{IndexResolverError, Result};
@@ -16,13 +17,11 @@ use serde::{Deserialize, Serialize};
 use tokio::task::spawn_blocking;
 use uuid::Uuid;
 
-use crate::index::update_handler::UpdateHandler;
-use crate::index::{error::Result as IndexResult, Index};
+use crate::index::{error::Result as IndexResult, update_handler::UpdateHandler, Index};
 use crate::options::IndexerOpts;
 use crate::tasks::batch::Batch;
 use crate::tasks::task::{DocumentDeletion, Job, Task, TaskContent, TaskEvent, TaskId, TaskResult};
-use crate::tasks::Pending;
-use crate::tasks::TaskPerformer;
+use crate::tasks::{Pending, TaskPerformer};
 use crate::update_file_store::UpdateFileStore;
 
 use self::meta_store::IndexMeta;
@@ -39,7 +38,7 @@ pub fn create_index_resolver(
     path: impl AsRef<Path>,
     index_size: usize,
     indexer_opts: &IndexerOpts,
-    meta_env: heed::Env,
+    meta_env: Arc<heed::Env>,
     file_store: UpdateFileStore,
 ) -> anyhow::Result<HardStateIndexResolver> {
     let uuid_store = HeedMetaStore::new(meta_env)?;
@@ -153,7 +152,7 @@ impl IndexResolver<HeedMetaStore, MapIndexStore> {
         src: impl AsRef<Path>,
         dst: impl AsRef<Path>,
         index_db_size: usize,
-        env: Env,
+        env: Arc<Env>,
         indexer_opts: &IndexerOpts,
     ) -> anyhow::Result<()> {
         HeedMetaStore::load_dump(&src, env)?;

meilisearch-lib/src/tasks/mod.rs

@@ -32,7 +32,7 @@ pub trait TaskPerformer: Sync + Send + 'static {
     async fn finish(&self, batch: &Batch);
 }
 
-pub fn create_task_store<P>(env: heed::Env, performer: Arc<P>) -> Result<TaskStore>
+pub fn create_task_store<P>(env: Arc<heed::Env>, performer: Arc<P>) -> Result<TaskStore>
 where
     P: TaskPerformer,
 {

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

@@ -114,7 +114,7 @@ impl Clone for TaskStore {
 }
 
 impl TaskStore {
-    pub fn new(env: heed::Env) -> Result<Self> {
+    pub fn new(env: Arc<heed::Env>) -> Result<Self> {
         let mut store = Store::new(env)?;
         let unfinished_tasks = store.reset_and_return_unfinished_tasks()?;
         let store = Arc::new(store);
@@ -293,7 +293,7 @@ impl TaskStore {
         Ok(())
     }
 
-    pub fn load_dump(src: impl AsRef<Path>, env: Env) -> anyhow::Result<()> {
+    pub fn load_dump(src: impl AsRef<Path>, env: Arc<Env>) -> anyhow::Result<()> {
         // create a dummy update field store, since it is not needed right now.
         let store = Self::new(env.clone())?;
 
@@ -340,7 +340,7 @@ pub mod test {
     }
 
     impl MockTaskStore {
-        pub fn new(env: heed::Env) -> Result<Self> {
+        pub fn new(env: Arc<heed::Env>) -> Result<Self> {
             Ok(Self::Real(TaskStore::new(env)?))
         }
 
@@ -432,7 +432,7 @@ pub mod test {
             }
         }
 
-        pub fn load_dump(path: impl AsRef<Path>, env: Env) -> anyhow::Result<()> {
+        pub fn load_dump(path: impl AsRef<Path>, env: Arc<Env>) -> anyhow::Result<()> {
             TaskStore::load_dump(path, env)
         }
     }

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

@@ -10,6 +10,7 @@ use std::convert::TryInto;
 use std::mem::size_of;
 use std::ops::Range;
 use std::result::Result as StdResult;
+use std::sync::Arc;
 
 use heed::types::{ByteSlice, OwnedType, SerdeJson, Unit};
 use heed::{BytesDecode, BytesEncode, Database, Env, RoTxn, RwTxn};
@@ -53,18 +54,26 @@ impl<'a> BytesDecode<'a> for IndexUidTaskIdCodec {
 }
 
 pub struct Store {
-    env: Env,
+    env: Arc<Env>,
     uids_task_ids: Database<IndexUidTaskIdCodec, Unit>,
     tasks: Database<OwnedType<BEU64>, SerdeJson<Task>>,
 }
 
+impl Drop for Store {
+    fn drop(&mut self) {
+        if Arc::strong_count(&self.env) == 1 {
+            self.env.as_ref().clone().prepare_for_closing();
+        }
+    }
+}
+
 impl Store {
     /// Create a new store from the specified `Path`.
     /// Be really cautious when calling this function, the returned `Store` may
     /// be in an invalid state, with dangling processing tasks.
     /// You want to patch  all un-finished tasks and put them in your pending
     /// queue with the `reset_and_return_unfinished_update` method.
-    pub fn new(env: heed::Env) -> Result<Self> {
+    pub fn new(env: Arc<heed::Env>) -> Result<Self> {
         let uids_task_ids = env.create_database(Some(UID_TASK_IDS))?;
         let tasks = env.create_database(Some(TASKS))?;
 
@@ -257,10 +266,10 @@ pub mod test {
         Fake(Mocker),
     }
 
-    pub struct TmpEnv(TempDir, heed::Env);
+    pub struct TmpEnv(TempDir, Arc<heed::Env>);
 
     impl TmpEnv {
-        pub fn env(&self) -> heed::Env {
+        pub fn env(&self) -> Arc<heed::Env> {
             self.1.clone()
         }
     }
@@ -271,13 +280,13 @@ pub mod test {
         let mut options = EnvOpenOptions::new();
         options.map_size(4096 * 100000);
         options.max_dbs(1000);
-        let env = options.open(tmp.path()).unwrap();
+        let env = Arc::new(options.open(tmp.path()).unwrap());
 
         TmpEnv(tmp, env)
     }
 
     impl MockStore {
-        pub fn new(env: heed::Env) -> Result<Self> {
+        pub fn new(env: Arc<heed::Env>) -> Result<Self> {
             Ok(Self::Real(Store::new(env)?))
         }