move as many fields as possible out of the IndexScheduler

index-scheduler/src/index_scheduler.rs

@@ -5,13 +5,11 @@ use file_store::{File, FileStore};
 use index::Index;
 use milli::update::IndexerConfig;
 use synchronoise::SignalEvent;
-use tempfile::TempDir;
 use time::OffsetDateTime;
 use uuid::Uuid;
 
 use std::path::PathBuf;
-use std::sync::Arc;
-use std::sync::RwLock;
+use std::sync::{Arc, RwLock};
 
 use milli::heed::types::{OwnedType, SerdeBincode, SerdeJson, Str};
 use milli::heed::{self, Database, Env};
@@ -124,18 +122,11 @@ pub struct IndexScheduler {
     /// Get a signal when a batch needs to be processed.
     pub(crate) wake_up: Arc<SignalEvent>,
 
-    // ================= tests
-    // The next entries are dedicated to the tests.
-    // It helps us to stop the scheduler and check what it is doing efficiently
-    /// Provide a way to break in multiple part of the scheduler.
-    #[cfg(test)]
-    test_breakpoint_rcv: crossbeam::channel::Receiver<Breakpoint>,
+    // ================= test
+    /// The next entry is dedicated to the tests.
+    /// It provide a way to break in multiple part of the scheduler.
     #[cfg(test)]
     test_breakpoint_sdr: crossbeam::channel::Sender<Breakpoint>,
-
-    /// Hold a reference to its own tempdir to delete itself once dropped.
-    #[cfg(test)]
-    test_tempdir: Arc<TempDir>,
 }
 
 #[cfg(test)]
@@ -147,7 +138,6 @@ enum Breakpoint {
 }
 
 impl IndexScheduler {
-    #[cfg(not(test))]
     pub fn new(
         tasks_path: PathBuf,
         update_file_path: PathBuf,
@@ -166,6 +156,8 @@ impl IndexScheduler {
         let processing_tasks = (OffsetDateTime::now_utc(), RoaringBitmap::new());
         let file_store = FileStore::new(&update_file_path)?;
 
+        // allow unreachable_code to get rids of the warning in the case of a test build.
+        #[allow(unreachable_code)]
         Ok(Self {
             // by default there is no processing tasks
             processing_tasks: Arc::new(RwLock::new(processing_tasks)),
@@ -178,6 +170,11 @@ impl IndexScheduler {
             env,
             // we want to start the loop right away in case meilisearch was ctrl+Ced while processing things
             wake_up: Arc::new(SignalEvent::auto(true)),
+
+            #[cfg(test)]
+            test_breakpoint_sdr: panic!(
+                "Can't use `IndexScheduler::new` in the tests. See `IndexScheduler::test`."
+            ),
         })
     }
 
@@ -403,34 +400,15 @@ impl IndexScheduler {
     pub fn notify(&self) {
         self.wake_up.signal()
     }
-
-    /// /!\ Used only for tests purposes.
-    /// Wait until the provided breakpoint is reached.
-    #[cfg(test)]
-    fn test_wait_till(&self, breakpoint: Breakpoint) {
-        self.test_breakpoint_rcv.iter().find(|b| *b == breakpoint);
-    }
-
-    /// /!\ Used only for tests purposes.
-    /// Wait until the provided breakpoint is reached.
-    #[cfg(test)]
-    fn test_next_breakpoint(&self) -> Breakpoint {
-        self.test_breakpoint_rcv.recv().unwrap()
-    }
-
-    /// /!\ Used only for tests purposes.
-    /// The scheduler will not stop on breakpoints.
-    #[cfg(test)]
-    fn test_dont_block(&self) {
-        // unroll and ignore all the state the scheduler is going to send us.
-        self.test_breakpoint_rcv.iter().last();
-    }
 }
 
 #[cfg(test)]
 mod tests {
+    use std::sync::Arc;
+
     use big_s::S;
     use insta::*;
+    use tempfile::TempDir;
     use uuid::Uuid;
 
     use crate::assert_smol_debug_snapshot;
@@ -438,11 +416,11 @@ mod tests {
     use super::*;
 
     impl IndexScheduler {
-        pub fn test() -> Self {
-            let dir = TempDir::new().unwrap();
-            let tasks_path = dir.path().join("db_path");
-            let update_file_path = dir.path().join("file_store");
-            let indexes_path = dir.path().join("indexes");
+        pub fn test() -> (Self, IndexSchedulerHandle) {
+            let tempdir = TempDir::new().unwrap();
+            let tasks_path = tempdir.path().join("db_path");
+            let update_file_path = tempdir.path().join("file_store");
+            let indexes_path = tempdir.path().join("indexes");
             let index_size = 1024 * 1024;
             let indexer_config = IndexerConfig::default();
 
@@ -459,7 +437,7 @@ mod tests {
 
             let (sender, receiver) = crossbeam::channel::bounded(0);
 
-            Self {
+            let index_scheduler = Self {
                 // by default there is no processing tasks
                 processing_tasks: Arc::new(RwLock::new(processing_tasks)),
                 file_store,
@@ -473,16 +451,43 @@ mod tests {
                 // we want to start the loop right away in case meilisearch was ctrl+Ced while processing things
                 wake_up: Arc::new(SignalEvent::auto(true)),
 
-                test_breakpoint_rcv: receiver,
                 test_breakpoint_sdr: sender,
-                test_tempdir: Arc::new(dir),
-            }
+            };
+            let index_scheduler_handle = IndexSchedulerHandle {
+                _tempdir: tempdir,
+                test_breakpoint_rcv: receiver,
+            };
+
+            (index_scheduler, index_scheduler_handle)
+        }
+    }
+
+    pub struct IndexSchedulerHandle {
+        _tempdir: TempDir,
+        test_breakpoint_rcv: crossbeam::channel::Receiver<Breakpoint>,
+    }
+
+    impl IndexSchedulerHandle {
+        /// Wait until the provided breakpoint is reached.
+        fn test_wait_till(&self, breakpoint: Breakpoint) {
+            self.test_breakpoint_rcv.iter().find(|b| *b == breakpoint);
+        }
+
+        /// Wait until the provided breakpoint is reached.
+        fn test_next_breakpoint(&self) -> Breakpoint {
+            self.test_breakpoint_rcv.recv().unwrap()
+        }
+
+        /// The scheduler will not stop on breakpoints.
+        fn test_dont_block(&self) {
+            // unroll and ignore all the state the scheduler is going to send us.
+            self.test_breakpoint_rcv.iter().last();
         }
     }
 
     #[test]
     fn register() {
-        let index_scheduler = IndexScheduler::test();
+        let (index_scheduler, _handle) = IndexScheduler::test();
         let kinds = [
             KindWithContent::IndexCreation {
                 index_uid: S("catto"),
@@ -556,7 +561,7 @@ mod tests {
 
     #[test]
     fn document_addition() {
-        let index_scheduler = IndexScheduler::test();
+        let (index_scheduler, handle) = IndexScheduler::test();
 
         let content = r#"
         {
@@ -596,7 +601,7 @@ mod tests {
         let t_index_scheduler = index_scheduler.clone();
         std::thread::spawn(move || t_index_scheduler.tick().unwrap());
 
-        index_scheduler.test_wait_till(Breakpoint::BatchCreated);
+        handle.test_wait_till(Breakpoint::BatchCreated);
 
         // Once the task has started being batched it should be marked as processing
         let task = index_scheduler.get_tasks(Query::default()).unwrap();
@@ -615,7 +620,7 @@ mod tests {
         ]
         "###);
         assert_eq!(
-            index_scheduler.test_next_breakpoint(),
+            handle.test_next_breakpoint(),
             Breakpoint::BatchProcessed
         );