Add SqliteStore implementation

We upstream our `SqliteStore` implementation that allows persistence
towards an SQLite database backend.

Author: tnull

bench/benches/bench.rs

@@ -16,6 +16,7 @@ criterion_group!(benches,
 	lightning::sign::benches::bench_get_secure_random_bytes,
 	lightning::ln::channelmanager::bench::bench_sends,
 	lightning_storage::fs_store::bench::bench_sends,
+	lightning_storage::sqlite_store::bench::bench_sends,
 	lightning_rapid_gossip_sync::bench::bench_reading_full_graph_from_file,
 	lightning::routing::gossip::benches::read_network_graph,
 	lightning::routing::gossip::benches::write_network_graph);

lightning-storage/Cargo.toml

@@ -17,6 +17,7 @@ rustdoc-args = ["--cfg", "docsrs"]
 lightning = { version = "0.0.116", path = "../lightning", default-features = false, features = ["std"] }
 rand = "0.8.5"
 libc = "0.2"
+rusqlite = { version = "0.28.0", features = ["bundled"] }
 
 [dev-dependencies]
 bitcoin = { version = "0.29.0", default-features = false }

lightning-storage/src/lib.rs

@@ -8,6 +8,7 @@
 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
 
 pub mod fs_store;
+pub mod sqlite_store;
 
 #[cfg(test)]
 mod test_utils;

lightning-storage/src/sqlite_store.rs

@@ -0,0 +1,225 @@
+//! Objects related to [`SqliteStore`] live here.
+use lightning::util::persist::KVStore;
+
+use rusqlite::{named_params, Connection};
+
+use std::fs;
+use std::io::Cursor;
+use std::path::PathBuf;
+use std::sync::{Arc, Mutex};
+
+/// The default database file name.
+pub const DEFAULT_SQLITE_DB_FILE_NAME: &str = "ldk_data.sqlite";
+
+/// The default table in which we store all data.
+pub const DEFAULT_KV_TABLE_NAME: &str = "ldk_data";
+
+// The current SQLite `user_version`, which we can use if we'd ever need to do a schema migration.
+const SCHEMA_USER_VERSION: u16 = 1;
+
+/// A [`KVStore`] implementation that writes to and reads from an [SQLite] database.
+///
+/// [SQLite]: https://sqlite.org
+pub struct SqliteStore {
+	connection: Arc<Mutex<Connection>>,
+	data_dir: PathBuf,
+	kv_table_name: String,
+}
+
+impl SqliteStore {
+	/// Constructs a new [`SqliteStore`].
+	///
+	/// If not already existing, a new SQLite database will be created in the given `data_dir` under the
+	/// given `db_file_name` (or the default to [`DEFAULT_SQLITE_DB_FILE_NAME`] if set to `None`).
+	///
+	/// Similarly, the given `kv_table_name` will be used or default to [`DEFAULT_KV_TABLE_NAME`].
+	pub fn new(data_dir: PathBuf, db_file_name: Option<String>, kv_table_name: Option<String>) -> Self {
+		let db_file_name = db_file_name.unwrap_or(DEFAULT_SQLITE_DB_FILE_NAME.to_string());
+		let kv_table_name = kv_table_name.unwrap_or(DEFAULT_KV_TABLE_NAME.to_string());
+
+		fs::create_dir_all(data_dir.clone()).unwrap_or_else(|_| {
+			panic!("Failed to create database destination directory: {}", data_dir.display())
+		});
+		let mut db_file_path = data_dir.clone();
+		db_file_path.push(db_file_name);
+
+		let connection = Connection::open(db_file_path.clone()).unwrap_or_else(|_| {
+			panic!("Failed to open/create database file: {}", db_file_path.display())
+		});
+
+		connection
+			.pragma(Some(rusqlite::DatabaseName::Main), "user_version", SCHEMA_USER_VERSION, |_| {
+				Ok(())
+			})
+			.unwrap_or_else(|_| panic!("Failed to set PRAGMA user_version"));
+
+		let sql = format!(
+			"CREATE TABLE IF NOT EXISTS {} (
+			namespace TEXT NOT NULL,
+			key TEXT NOT NULL CHECK (key <> ''),
+			value BLOB, PRIMARY KEY ( namespace, key )
+		);",
+			kv_table_name
+		);
+		connection
+			.execute(&sql, [])
+			.unwrap_or_else(|_| panic!("Failed to create table: {}", kv_table_name));
+
+		let connection = Arc::new(Mutex::new(connection));
+		Self { connection, data_dir, kv_table_name }
+	}
+
+	/// Returns the data directory.
+	pub fn get_data_dir(&self) -> PathBuf {
+		self.data_dir.clone()
+	}
+}
+
+impl KVStore for SqliteStore {
+	type Reader = Cursor<Vec<u8>>;
+
+	fn read(&self, namespace: &str, key: &str) -> std::io::Result<Self::Reader> {
+		let locked_conn = self.connection.lock().unwrap();
+		let sql =
+			format!("SELECT value FROM {} WHERE namespace=:namespace AND key=:key;", self.kv_table_name);
+
+		let res = locked_conn
+			.query_row(
+				&sql,
+				named_params! {
+					":namespace": namespace,
+					":key": key,
+				},
+				|row| row.get(0),
+			)
+			.map_err(|e| match e {
+				rusqlite::Error::QueryReturnedNoRows => {
+					let msg =
+						format!("Failed to read as key could not be found: {}/{}", namespace, key);
+					std::io::Error::new(std::io::ErrorKind::NotFound, msg)
+				}
+				e => {
+					let msg = format!("Failed to read from key {}/{}: {}", namespace, key, e);
+					std::io::Error::new(std::io::ErrorKind::Other, msg)
+				}
+			})?;
+		Ok(Cursor::new(res))
+	}
+
+	fn write(&self, namespace: &str, key: &str, buf: &[u8]) -> std::io::Result<()> {
+		let locked_conn = self.connection.lock().unwrap();
+
+		let sql = format!(
+			"INSERT OR REPLACE INTO {} (namespace, key, value) VALUES (:namespace, :key, :value);",
+			self.kv_table_name
+		);
+
+		locked_conn
+			.execute(
+				&sql,
+				named_params! {
+					":namespace": namespace,
+					":key": key,
+					":value": buf,
+				},
+			)
+			.map(|_| ())
+			.map_err(|e| {
+				let msg = format!("Failed to write to key {}/{}: {}", namespace, key, e);
+				std::io::Error::new(std::io::ErrorKind::Other, msg)
+			})
+	}
+
+	fn remove(&self, namespace: &str, key: &str) -> lightning::io::Result<()> {
+		let locked_conn = self.connection.lock().unwrap();
+
+		let sql = format!("DELETE FROM {} WHERE namespace=:namespace AND key=:key;", self.kv_table_name);
+		locked_conn
+			.execute(
+				&sql,
+				named_params! {
+					":namespace": namespace,
+					":key": key,
+				},
+			)
+			.map_err(|e| {
+				let msg = format!("Failed to delete key {}/{}: {}", namespace, key, e);
+				std::io::Error::new(std::io::ErrorKind::Other, msg)
+			})?;
+		Ok(())
+	}
+
+	fn list(&self, namespace: &str) -> std::io::Result<Vec<String>> {
+		let locked_conn = self.connection.lock().unwrap();
+
+		let sql = format!("SELECT key FROM {} WHERE namespace=:namespace", self.kv_table_name);
+		let mut stmt = locked_conn.prepare(&sql).map_err(|e| {
+			let msg = format!("Failed to prepare statement: {}", e);
+			std::io::Error::new(std::io::ErrorKind::Other, msg)
+		})?;
+
+		let mut keys = Vec::new();
+
+		let rows_iter = stmt
+			.query_map(named_params! {":namespace": namespace, }, |row| row.get(0))
+			.map_err(|e| {
+				let msg = format!("Failed to retrieve queried rows: {}", e);
+				std::io::Error::new(std::io::ErrorKind::Other, msg)
+			})?;
+
+		for k in rows_iter {
+			keys.push(k.map_err(|e| {
+				let msg = format!("Failed to retrieve queried rows: {}", e);
+				std::io::Error::new(std::io::ErrorKind::Other, msg)
+			})?);
+		}
+
+		Ok(keys)
+	}
+}
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+	use crate::test_utils::{do_read_write_remove_list_persist,do_test_store};
+
+	impl Drop for SqliteStore {
+		fn drop(&mut self) {
+			match fs::remove_dir_all(&self.data_dir) {
+				Err(e) => println!("Failed to remove test store directory: {}", e),
+				_ => {}
+			}
+		}
+	}
+
+	#[test]
+	fn read_write_remove_list_persist() {
+		let mut temp_path = std::env::temp_dir();
+		temp_path.push("read_write_remove_list_persist");
+		let store = SqliteStore::new(temp_path, Some("test_db".to_string()), Some("test_table".to_string()));
+		do_read_write_remove_list_persist(&store);
+	}
+
+	#[test]
+	fn test_sqlite_store() {
+		let mut temp_path = std::env::temp_dir();
+		temp_path.push("test_sqlite_store");
+		let store_0 = SqliteStore::new(temp_path.clone(), Some("test_db_0".to_string()), Some("test_table".to_string()));
+		let store_1 = SqliteStore::new(temp_path, Some("test_db_1".to_string()), Some("test_table".to_string()));
+		do_test_store(&store_0, &store_1)
+	}
+}
+
+#[cfg(ldk_bench)]
+/// Benches
+pub mod bench {
+	use criterion::Criterion;
+
+	/// Bench!
+	pub fn bench_sends(bench: &mut Criterion) {
+		let store_a = super::SqliteStore::new("bench_sqlite_store_a".into(), None, None);
+		let store_b = super::SqliteStore::new("bench_sqlite_store_b".into(), None, None);
+		lightning::ln::channelmanager::bench::bench_two_sends(
+			bench, "bench_sqlite_persisted_sends", store_a, store_b);
+	}
+}