refactor: [#932] make all Tracker fields private

src/core/mod.rs

@@ -481,13 +481,14 @@ use crate::CurrentClock;
 /// > Typically, the `Tracker` is used by a higher application service that handles
 /// > the network layer.
 pub struct Tracker {
+    // The tracker configuration.
     config: Core,
     /// A database driver implementation: [`Sqlite3`](crate::core::databases::sqlite)
     /// or [`MySQL`](crate::core::databases::mysql)
-    pub database: Arc<Box<dyn Database>>,
+    database: Arc<Box<dyn Database>>,
     keys: tokio::sync::RwLock<std::collections::HashMap<Key, auth::ExpiringKey>>,
     whitelist: tokio::sync::RwLock<std::collections::HashSet<InfoHash>>,
-    pub torrents: Arc<Torrents>,
+    torrents: Arc<Torrents>,
     stats_event_sender: Option<Box<dyn statistics::EventSender>>,
     stats_repository: statistics::Repo,
 }
@@ -987,6 +988,17 @@ impl Tracker {
             Some(stats_event_sender) => stats_event_sender.send_event(event).await,
         }
     }
+
+    /// It drops the database tables.
+    ///
+    /// # Errors
+    ///
+    /// Will return `Err` if unable to drop tables.
+    pub fn drop_database_tables(&self) -> Result<(), databases::error::Error> {
+        // todo: this is only used for testing. WE have to pass the database
+        // reference directly to the tests instead of via the tracker.
+        self.database.drop_database_tables()
+    }
 }
 
 #[must_use]

tests/servers/api/mod.rs

@@ -11,7 +11,10 @@ pub type Started = environment::Environment<server::Running>;
 
 /// It forces a database error by dropping all tables.
 /// That makes any query fail.
-/// code-review: alternatively we could inject a database mock in the future.
+/// code-review:
+/// Alternatively we could:
+/// - Inject a database mock in the future.
+/// - Inject directly the database reference passed to the Tracker type.
 pub fn force_database_error(tracker: &Arc<Tracker>) {
-    tracker.database.drop_database_tables().unwrap();
+    tracker.drop_database_tables().unwrap();
 }