add stake pool autoprune

mithril-aggregator/src/command_args.rs

@@ -34,7 +34,7 @@ use mithril_common::{
 };
 
 use crate::{
-    database::provider::StakePoolRepository,
+    database::provider::StakePoolStore,
     event_store::{self, TransmitterService},
     http_server::routes::router,
     tools::{EraTools, GenesisTools, GenesisToolsDependency},
@@ -90,9 +90,9 @@ fn setup_genesis_dependencies(
         )?),
         config.store_retention_limit,
     ));
-    let stake_store = Arc::new(StakePoolRepository::new(Arc::new(Mutex::new(
-        Connection::open(sqlite_db_path.clone().unwrap())?,
-    ))));
+    let stake_store = Arc::new(StakePoolStore::new(Arc::new(Mutex::new(Connection::open(
+        sqlite_db_path.clone().unwrap(),
+    )?))));
     let single_signature_store = Arc::new(SingleSignatureStore::new(
         Box::new(SQLiteAdapter::new("single_signature", sqlite_db_path)?),
         config.store_retention_limit,
@@ -359,9 +359,9 @@ impl ServeCommand {
             )?),
             config.store_retention_limit,
         ));
-        let stake_store = Arc::new(StakePoolRepository::new(Arc::new(Mutex::new(
-            Connection::open(sqlite_db_path.clone().unwrap())?,
-        ))));
+        let stake_store = Arc::new(StakePoolStore::new(Arc::new(Mutex::new(Connection::open(
+            sqlite_db_path.clone().unwrap(),
+        )?))));
         let single_signature_store = Arc::new(SingleSignatureStore::new(
             Box::new(SQLiteAdapter::new(
                 "single_signature",

mithril-aggregator/src/database/provider/stake_pool.rs

@@ -18,6 +18,9 @@ use mithril_common::{
 
 use mithril_common::StdError;
 
+/// Delete stake pools for Epoch older than this.
+const STAKE_POOL_PRUNE_EPOCH_THRESHOLD: u64 = 3;
+
 /// Stake pool as read from Chain.
 /// TODO remove this compile directive ↓
 #[allow(dead_code)]
@@ -186,20 +189,62 @@ impl<'conn> Provider<'conn> for UpdateStakePoolProvider<'conn> {
     }
 }
 
+/// Provider to remove old data from the stake_pool table
+pub struct DeleteStakePoolProvider<'conn> {
+    connection: &'conn Connection,
+}
+
+impl<'conn> Provider<'conn> for DeleteStakePoolProvider<'conn> {
+    type Entity = StakePool;
+
+    fn get_connection(&'conn self) -> &'conn Connection {
+        self.connection
+    }
+
+    fn get_definition(&self, condition: &str) -> String {
+        // it is important to alias the fields with the same name as the table
+        // since the table cannot be aliased in a RETURNING statement in SQLite.
+        let projection = Self::Entity::get_projection()
+            .expand(SourceAlias::new(&[("{:stake_pool:}", "stake_pool")]));
+
+        format!("delete from stake_pool where {condition} returning {projection}")
+    }
+}
+
+impl<'conn> DeleteStakePoolProvider<'conn> {
+    /// Create a new instance
+    pub fn new(connection: &'conn Connection) -> Self {
+        Self { connection }
+    }
+
+    /// Create the SQL condition to prune data older than the given Epoch.
+    fn get_prune_condition(&self, epoch_threshold: Epoch) -> WhereCondition {
+        let epoch_value = Value::Integer(i64::try_from(epoch_threshold.0).unwrap());
+
+        WhereCondition::new("epoch < ?*", vec![epoch_value])
+    }
+
+    /// Prune the stake pools data older than the given epoch.
+    pub fn prune(&self, epoch_threshold: Epoch) -> Result<EntityCursor<StakePool>, StdError> {
+        let filters = self.get_prune_condition(epoch_threshold);
+
+        self.find(filters)
+    }
+}
 /// Service to deal with stake pools (read & write).
-pub struct StakePoolRepository {
+pub struct StakePoolStore {
     connection: Arc<Mutex<Connection>>,
 }
 
-impl StakePoolRepository {
+impl StakePoolStore {
     /// Create a new StakePool service
     pub fn new(connection: Arc<Mutex<Connection>>) -> Self {
         Self { connection }
     }
 }
 
 #[async_trait]
-impl StakeStorer for StakePoolRepository {
+impl StakeStorer for StakePoolStore {
     async fn save_stakes(
         &self,
         epoch: Epoch,
@@ -221,6 +266,9 @@ impl StakeStorer for StakePoolRepository {
                 .map_err(|e| AdapterError::GeneralError(format!("{e}")))?;
             new_stakes.insert(pool_id.to_string(), stake_pool.stake);
         }
+        let _ = DeleteStakePoolProvider::new(connection)
+            .prune(Epoch(epoch.0 - STAKE_POOL_PRUNE_EPOCH_THRESHOLD))
+            .map_err(AdapterError::InitializationError)?;
         connection
             .execute("commit transaction")
             .map_err(|e| AdapterError::QueryError(e.into()))?;
@@ -293,4 +341,15 @@ mod tests {
             params
         );
     }
+
+    #[test]
+    fn prune() {
+        let connection = Connection::open(":memory:").unwrap();
+        let provider = DeleteStakePoolProvider::new(&connection);
+        let condition = provider.get_prune_condition(Epoch(5));
+        let (condition, params) = condition.expand();
+
+        assert_eq!("epoch < ?1".to_string(), condition);
+        assert_eq!(vec![Value::Integer(5)], params);
+    }
 }

mithril-common/src/sqlite/source_alias.rs

@@ -31,12 +31,11 @@ mod tests {
     #[test]
     fn simple_source_alias() {
         let source_alias = SourceAlias::new(&[("first", "one"), ("second", "two")]);
-        let target = source_alias
-            .get_iterator()
-            .map(|(name, alias)| format!("{name} => {alias}"))
-            .collect::<Vec<String>>()
-            .join(", ");
+        let mut fields = "first.one, second.two".to_string();
 
-        assert_eq!("first => one, second => two".to_string(), target);
+        for (alias, source) in source_alias.get_iterator() {
+            fields = fields.replace(alias, source);
+        }
+        assert_eq!("one.one, two.two".to_string(), fields);
     }
 }