Fix the watcher ordering of the auth/ node

meilisearch-auth/src/lib.rs

@@ -39,6 +39,34 @@ impl AuthController {
         match controller.zookeeper {
             // setup the auth zk environment, the `auth` node
             Some(ref zookeeper) => {
+                // Zookeeper Event listener loop
+                let controller_clone = controller.clone();
+                let zkk = zookeeper.clone();
+                zookeeper.add_watch("/auth", AddWatchMode::PersistentRecursive, move |event| {
+                    let WatchedEvent { event_type, path, keeper_state: _ } = dbg!(event);
+
+                    match event_type {
+                        WatchedEventType::NodeDeleted => {
+                            // TODO: ugly unwraps
+                            let path = path.unwrap();
+                            let uuid = path.strip_prefix("/auth/").unwrap();
+                            let uuid = Uuid::parse_str(&uuid).unwrap();
+                            log::info!("The key {} has been deleted", uuid);
+                            controller_clone.store.delete_api_key(uuid).unwrap();
+                        }
+                        WatchedEventType::NodeCreated | WatchedEventType::NodeDataChanged => {
+                            let path = path.unwrap();
+                            if path.strip_prefix("/auth/").map_or(false, |s| !s.is_empty()) {
+                                let (key, _stat) = zkk.get_data(&path, false).unwrap();
+                                let key: Key = serde_json::from_slice(&key).unwrap();
+                                log::info!("The key {} has been deleted", key.uid);
+                                controller_clone.store.put_api_key(key).unwrap();
+                            }
+                        }
+                        otherwise => panic!("Got the unexpected `{otherwise:?}` event!"),
+                    }
+                })?;
+
                 // TODO: we should catch the potential unexpected errors here https://docs.rs/zookeeper-client/latest/zookeeper_client/struct.Client.html#method.create
                 // for the moment we consider that `create` only returns Error::NodeExists.
                 match zookeeper.create(
@@ -86,33 +114,6 @@ impl AuthController {
                 //       The second one will delete its DB, load nothing and install a watcher
                 //       The first one will push its keys and should wake up and update the second one.
                 //     / BUT, if the second one delete its DB and the first one push its files before the second one install the watcher we're fucked
-
-                // Zookeeper Event listener loop
-                let controller_clone = controller.clone();
-                let zkk = zookeeper.clone();
-                zookeeper.add_watch("/auth", AddWatchMode::PersistentRecursive, move |event| {
-                    let WatchedEvent { event_type, path, keeper_state: _ } = dbg!(event);
-
-                    match event_type {
-                        WatchedEventType::NodeDeleted => {
-                            // TODO: ugly unwraps
-                            let path = path.unwrap();
-                            let uuid = path.strip_prefix("/auth/").unwrap();
-                            let uuid = Uuid::parse_str(&uuid).unwrap();
-                            log::info!("The key {} has been deleted", uuid);
-                            dbg!(controller_clone.store.delete_api_key(uuid).unwrap());
-                        }
-                        WatchedEventType::NodeCreated | WatchedEventType::NodeDataChanged => {
-                            let path = path.unwrap();
-                            let (key, _stat) = zkk.get_data(&path, false).unwrap();
-                            let key: Key = serde_json::from_slice(&key).unwrap();
-                            log::info!("The key {} has been deleted", key.uid);
-
-                            dbg!(controller_clone.store.put_api_key(key).unwrap());
-                        }
-                        otherwise => panic!("Got the unexpected `{otherwise:?}` event!"),
-                    }
-                })?;
             }
             None => {
                 if controller.store.is_empty()? {
@@ -149,18 +150,20 @@ impl AuthController {
 
     pub fn put_key(&self, key: Key) -> Result<Key> {
         let store = self.store.clone();
-        // TODO: we may commit only after zk persisted the keys
+        match &self.zookeeper {
-        let key = store.put_api_key(key)?;
+            Some(zookeeper) => {
-        if let Some(zookeeper) = &self.zookeeper {
                 zookeeper.create(
                     &format!("/auth/{}", key.uid),
                     serde_json::to_vec_pretty(&key)?,
                     Acl::open_unsafe().clone(),
                     CreateMode::Persistent,
                 )?;
-        }
+
                 Ok(key)
             }
+            None => store.put_api_key(key),
+        }
+    }
 
     pub fn update_key(&self, uid: Uuid, patch: PatchApiKey) -> Result<Key> {
         let mut key = self.get_key(uid)?;
@@ -175,16 +178,19 @@ impl AuthController {
         key.updated_at = OffsetDateTime::now_utc();
         let store = self.store.clone();
         // TODO: we may commit only after zk persisted the keys
-        let key = store.put_api_key(key)?;
+        match &self.zookeeper {
-        if let Some(zookeeper) = &self.zookeeper {
+            Some(zookeeper) => {
                 zookeeper.set_data(
                     &format!("/auth/{}", key.uid),
                     serde_json::to_vec_pretty(&key)?,
                     None,
                 )?;
-        }
+
                 Ok(key)
             }
+            None => store.put_api_key(key),
+        }
+    }
 
     pub fn get_key(&self, uid: Uuid) -> Result<Key> {
         self.store
@@ -225,12 +231,19 @@ impl AuthController {
     }
 
     pub fn delete_key(&self, uid: Uuid) -> Result<()> {
+        let deleted = match &self.zookeeper {
+            Some(zookeeper) => match zookeeper.delete(&format!("/auth/{}", uid), None) {
+                Ok(()) => true,
+                Err(ZkError::NoNode) => false,
+                Err(e) => return Err(e.into()),
+            },
+            None => {
                 let store = self.store.clone();
-        let deleted = store.delete_api_key(uid)?;
+                store.delete_api_key(uid)?
-        if deleted {
-            if let Some(zookeeper) = &self.zookeeper {
-                zookeeper.delete(&format!("/auth/{}", uid), None)?;
             }
+        };
+
+        if deleted {
             Ok(())
         } else {
             Err(AuthControllerError::ApiKeyNotFound(uid.to_string()))