write most of the run loop

index-scheduler/src/batch.rs

@@ -1,7 +1,7 @@
 use crate::{
     autobatcher::BatchKind,
     task::{Kind, KindWithContent, Status, Task},
-    Error, IndexScheduler, Result,
+    Error, IndexScheduler, Result, TaskId,
 };
 use index::{Settings, Unchecked};
 use milli::{
@@ -33,6 +33,26 @@ pub(crate) enum Batch {
     },
 }
 
+impl Batch {
+    pub fn ids(&self) -> Vec<TaskId> {
+        match self {
+            Batch::Cancel(task) => vec![task.uid],
+            Batch::Snapshot(tasks) | Batch::Dump(tasks) | Batch::DocumentAddition { tasks, .. } => {
+                tasks.iter().map(|task| task.uid).collect()
+            }
+            Batch::SettingsAndDocumentAddition {
+                document_addition_tasks,
+                settings_tasks,
+                ..
+            } => document_addition_tasks
+                .iter()
+                .chain(settings_tasks)
+                .map(|task| task.uid)
+                .collect(),
+        }
+    }
+}
+
 impl IndexScheduler {
     pub(crate) fn create_next_batch_index(
         &self,

index-scheduler/src/index_scheduler.rs

@@ -1,10 +1,11 @@
 use crate::index_mapper::IndexMapper;
 use crate::task::{Kind, KindWithContent, Status, Task, TaskView};
-use crate::Result;
+use crate::{Error, Result};
 use file_store::FileStore;
 use index::Index;
 use milli::update::IndexerConfig;
 use synchronoise::SignalEvent;
+use time::OffsetDateTime;
 
 use std::path::PathBuf;
 use std::sync::Arc;
@@ -45,8 +46,8 @@ pub mod db_name {
 /// 2. Schedule the tasks.
 #[derive(Clone)]
 pub struct IndexScheduler {
-    /// The list of tasks currently processing.
-    pub(crate) processing_tasks: Arc<RwLock<RoaringBitmap>>,
+    /// The list of tasks currently processing and their starting date.
+    pub(crate) processing_tasks: Arc<RwLock<(OffsetDateTime, RoaringBitmap)>>,
 
     pub(crate) file_store: FileStore,
 
@@ -89,9 +90,11 @@ impl IndexScheduler {
         // we want to start the loop right away in case meilisearch was ctrl+Ced while processing things
         let wake_up = SignalEvent::auto(true);
 
+        let processing_tasks = (OffsetDateTime::now_utc(), RoaringBitmap::new());
+
         Ok(Self {
             // by default there is no processing tasks
-            processing_tasks: Arc::default(),
+            processing_tasks: Arc::new(RwLock::new(processing_tasks)),
             file_store: FileStore::new(update_file_path)?,
             all_tasks: env.create_database(Some(db_name::ALL_TASKS))?,
             status: env.create_database(Some(db_name::STATUS))?,
@@ -201,38 +204,63 @@ impl IndexScheduler {
     }
 
     /// This worker function must be run in a different thread and must be run only once.
-    fn run(&self) -> ! {
+    pub fn run(&self) -> ! {
         loop {
             self.wake_up.wait();
 
-            self.tick()
+            match self.tick() {
+                Ok(()) => (),
+                Err(e) => log::error!("{}", e),
+            }
         }
     }
 
     /// Create and execute and store the result of one batch of registered tasks.
-    fn tick(&self) {
-        let mut wtxn = match self.env.write_txn() {
-            Ok(wtxn) => wtxn,
-            Err(e) => {
-                log::error!("{}", e);
-                return;
-            }
+    fn tick(&self) -> Result<()> {
+        let mut wtxn = self.env.write_txn()?;
+        let batch = match self.create_next_batch(&wtxn)? {
+            Some(batch) => batch,
+            None => return Ok(()),
         };
-        let batch = match self.create_next_batch(&wtxn) {
-            Ok(Some(batch)) => batch,
-            Ok(None) => return,
-            Err(e) => {
-                log::error!("{}", e);
-                return;
+
+        // 1. store the starting date with the bitmap of processing tasks.
+        let mut ids = batch.ids();
+        ids.sort_unstable();
+        let processing_tasks = RoaringBitmap::from_sorted_iter(ids.iter().copied()).unwrap();
+        let started_at = OffsetDateTime::now_utc();
+        *self.processing_tasks.write().unwrap() = (started_at, processing_tasks);
+
+        // 2. process the tasks
+        let res = self.process_batch(&mut wtxn, batch);
+
+        let finished_at = OffsetDateTime::now_utc();
+        match res {
+            Ok(tasks) => {
+                for mut task in tasks {
+                    task.started_at = Some(started_at);
+                    task.finished_at = Some(finished_at);
+                    task.status = Status::Succeeded;
+                    // the info field should've been set by the process_batch function
+
+                    self.update_task(&mut wtxn, &task)?;
+                    task.remove_data()?;
                 }
-        };
-        // 1. store the starting date with the bitmap of processing tasks
-        // 2. update the tasks with a starting date *but* do not write anything on disk
+            }
+            // In case of a failure we must get back and patch all the tasks with the error.
+            Err(_err) => {
+                for id in ids {
+                    let mut task = self.get_task(&wtxn, id)?.ok_or(Error::CorruptedTaskQueue)?;
+                    task.started_at = Some(started_at);
+                    task.finished_at = Some(finished_at);
+                    task.status = Status::Failed;
+                    // TODO: TAMO: set the error correctly
+                    // task.error = Some(err);
 
-        // 3. process the tasks
-        let _res = self.process_batch(&mut wtxn, batch);
-
-        // 4. store the updated tasks on disk
+                    self.update_task(&mut wtxn, &task)?;
+                    task.remove_data()?;
+                }
+            }
+        }
 
         // TODO: TAMO: do this later
         // must delete the file on disk
@@ -240,13 +268,10 @@ impl IndexScheduler {
         // in case of « success » we must update all the task on disk
         // self.handle_batch_result(res);
 
-        match wtxn.commit() {
-            Ok(()) => log::info!("A batch of tasks was successfully completed."),
-            Err(e) => {
-                log::error!("{}", e);
-                return;
-            }
-        }
+        wtxn.commit()?;
+        log::info!("A batch of tasks was successfully completed.");
+
+        Ok(())
     }
 
     #[cfg(truc)]

index-scheduler/src/utils.rs

@@ -44,7 +44,7 @@ impl IndexScheduler {
             .collect::<Result<_>>()
     }
 
-    pub(crate) fn update_task(&self, wtxn: &mut RwTxn, task: Task) -> Result<()> {
+    pub(crate) fn update_task(&self, wtxn: &mut RwTxn, task: &Task) -> Result<()> {
         let old_task = self
             .get_task(wtxn, task.uid)?
             .ok_or(Error::CorruptedTaskQueue)?;