sqlite support

Cargo.toml

@@ -31,6 +31,7 @@ tokio-postgres = "0.7.16"
 tokio = { version = "1.50.0", features = ["rt-multi-thread", "macros", "default"]}
 async-recursion = "1.1.1"
 bb8 = "0.9.1"
+rusqlite = { version = "0.31", features = ["bundled"] }
 log = "0.4.29"
 
 [dev-dependencies]
@@ -39,3 +40,4 @@ predicates = "3.1.4"
 tempfile = "3.27.0"
 test_utils = { path="test-utils" }
 pretty_assertions = "1.4.1"
+rusqlite = { version = "0.31", features = ["bundled"] }

src/common/config.rs

@@ -234,7 +234,9 @@ impl Config {
         .or_else(|| default_config.map(|x| x.db_host.clone()))
     };
 
-    let db_host = match (db_url.is_some(), db_host_chain()) {
+    let is_sqlite = matches!(db_type, DatabaseType::Sqlite);
+
+    let db_host = match (db_url.is_some() || is_sqlite, db_host_chain()) {
       (true, Some(v)) => v,
       (true, None) => String::new(),
       (false, Some(v)) => v,
@@ -254,7 +256,7 @@ impl Config {
         .or_else(|| default_config.map(|x| x.db_port))
     };
 
-    let db_port = match (db_url.is_some(), db_port_chain()) {
+    let db_port = match (db_url.is_some() || is_sqlite, db_port_chain()) {
       (true, Some(v)) => v,
       (true, None) => 0,
       (false, Some(v)) => v,
@@ -275,7 +277,7 @@ impl Config {
         .or_else(|| default_config.map(|x| x.db_user.clone()))
     };
 
-    let db_user = match (db_url.is_some(), db_user_chain()) {
+    let db_user = match (db_url.is_some() || is_sqlite, db_user_chain()) {
       (true, Some(v)) => v,
       (true, None) => String::new(),
       (false, Some(v)) => v,
@@ -381,6 +383,19 @@ impl Config {
     .to_string()
   }
 
+  /// Returns the file path for a SQLite database connection.
+  /// If DB_URL is provided, it's used directly. Otherwise DB_NAME is used as the file path.
+  pub fn get_sqlite_path(&self, conn: &DbConnectionConfig) -> String {
+    if let Some(db_url) = &conn.db_url {
+      return db_url.to_owned();
+    }
+
+    conn
+      .db_name
+      .clone()
+      .unwrap_or_else(|| panic!("DB_NAME (file path) is required for SQLite connections"))
+  }
+
   pub fn get_postgres_cred(&self, conn: &DbConnectionConfig) -> String {
     // If custom DB_URL is provided, use it directly
     if let Some(db_url) = &conn.db_url {

src/common/dotenv.rs

@@ -32,12 +32,10 @@ impl Dotenv {
     Dotenv {
       db_type: match Self::get_var("DB_TYPE") {
         None => None,
-        Some(val) => {
-          if val == "mysql" {
-            Some(DatabaseType::Mysql)
-          } else {
-            Some(DatabaseType::Postgres)
-          }
+        Some(val) => match val.as_str() {
+          "mysql" => Some(DatabaseType::Mysql),
+          "sqlite" => Some(DatabaseType::Sqlite),
+          _ => Some(DatabaseType::Postgres),
         }
       },
       db_user: Self::get_var("DB_USER"),

src/common/lazy.rs

@@ -4,6 +4,7 @@ use crate::common::types::DatabaseType;
 use crate::core::connection::{DBConn, DBConnections};
 use crate::core::mysql::pool::MySqlConnectionManager;
 use crate::core::postgres::pool::PostgresConnectionManager;
+use crate::core::sqlite::pool::SqliteConnectionManager;
 use crate::ts_generator::information_schema::DBSchema;
 use clap::Parser;
 use std::sync::LazyLock;
@@ -49,6 +50,20 @@ pub static DB_CONN_CACHE: LazyLock<HashMap<String, Arc<Mutex<DBConn>>>> = LazyLo
           DBConn::MySQLPooledConn(Mutex::new(pool))
         })
       }),
+      DatabaseType::Sqlite => task::block_in_place(|| {
+        Handle::current().block_on(async {
+          let sqlite_path = CONFIG.get_sqlite_path(connection_config);
+          let manager = SqliteConnectionManager::new(sqlite_path, connection.to_string());
+          let pool = bb8::Pool::builder()
+            .max_size(connection_config.pool_size)
+            .connection_timeout(std::time::Duration::from_secs(connection_config.connection_timeout))
+            .build(manager)
+            .await
+            .expect(&ERR_DB_CONNECTION_ISSUE);
+
+          DBConn::SqliteConn(Mutex::new(pool))
+        })
+      }),
       DatabaseType::Postgres => task::block_in_place(|| {
         Handle::current().block_on(async {
           let postgres_cred = CONFIG.get_postgres_cred(connection_config);

src/common/types.rs

@@ -18,6 +18,7 @@ pub enum FileExtension {
 pub enum DatabaseType {
   Postgres,
   Mysql,
+  Sqlite,
 }
 
 #[derive(ValueEnum, Debug, Clone, Serialize, Deserialize)]

src/core/connection.rs

@@ -3,6 +3,7 @@ use crate::common::types::DatabaseType;
 use crate::common::SQL;
 use crate::core::mysql::prepare as mysql_explain;
 use crate::core::postgres::prepare as postgres_explain;
+use crate::core::sqlite::prepare as sqlite_explain;
 use crate::ts_generator::types::ts_query::TsQuery;
 use bb8::Pool;
 use std::collections::HashMap;
@@ -11,6 +12,7 @@ use tokio::sync::Mutex;
 
 use super::mysql::pool::MySqlConnectionManager;
 use super::postgres::pool::PostgresConnectionManager;
+use super::sqlite::pool::SqliteConnectionManager;
 use crate::common::errors::DB_CONN_FROM_LOCAL_CACHE_ERROR;
 use color_eyre::Result;
 use swc_common::errors::Handler;
@@ -19,6 +21,7 @@ use swc_common::errors::Handler;
 pub enum DBConn {
   MySQLPooledConn(Mutex<Pool<MySqlConnectionManager>>),
   PostgresConn(Mutex<Pool<PostgresConnectionManager>>),
+  SqliteConn(Mutex<Pool<SqliteConnectionManager>>),
 }
 
 impl DBConn {
@@ -31,6 +34,7 @@ impl DBConn {
     let (explain_failed, ts_query) = match &self {
       DBConn::MySQLPooledConn(_conn) => mysql_explain::prepare(self, sql, should_generate_types, handler).await?,
       DBConn::PostgresConn(_conn) => postgres_explain::prepare(self, sql, should_generate_types, handler).await?,
+      DBConn::SqliteConn(_conn) => sqlite_explain::prepare(self, sql, should_generate_types, handler).await?,
     };
 
     Ok((explain_failed, ts_query))
@@ -41,6 +45,7 @@ impl DBConn {
     match self {
       DBConn::MySQLPooledConn(_) => DatabaseType::Mysql,
       DBConn::PostgresConn(_) => DatabaseType::Postgres,
+      DBConn::SqliteConn(_) => DatabaseType::Sqlite,
     }
   }
 }

src/core/mod.rs

@@ -2,3 +2,4 @@ pub mod connection;
 pub mod execute;
 pub mod mysql;
 pub mod postgres;
+pub mod sqlite;

src/core/sqlite/mod.rs

@@ -0,0 +1,2 @@
+pub mod pool;
+pub mod prepare;

src/core/sqlite/pool.rs

@@ -0,0 +1,82 @@
+use rusqlite::Connection;
+use std::sync::{Arc, Mutex};
+use tokio::task;
+
+/// A connection manager for SQLite that wraps rusqlite's synchronous Connection
+/// behind an Arc<Mutex<>> for thread-safe access with bb8 connection pooling.
+#[derive(Clone, Debug)]
+pub struct SqliteConnectionManager {
+  db_path: String,
+  connection_name: String,
+}
+
+/// Wrapper around rusqlite::Connection to make it Send + Sync for bb8
+pub struct SqliteConnection {
+  pub conn: Arc<Mutex<Connection>>,
+}
+
+// Safety: rusqlite::Connection is not Send by default, but we protect it with Mutex
+// and only access it via spawn_blocking
+unsafe impl Send for SqliteConnection {}
+unsafe impl Sync for SqliteConnection {}
+
+impl SqliteConnectionManager {
+  pub fn new(db_path: String, connection_name: String) -> Self {
+    Self {
+      db_path,
+      connection_name,
+    }
+  }
+}
+
+#[derive(Debug)]
+pub struct SqlitePoolError(pub String);
+
+impl std::fmt::Display for SqlitePoolError {
+  fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+    write!(f, "SQLite pool error: {}", self.0)
+  }
+}
+
+impl std::error::Error for SqlitePoolError {}
+
+impl bb8::ManageConnection for SqliteConnectionManager {
+  type Connection = SqliteConnection;
+  type Error = SqlitePoolError;
+
+  async fn connect(&self) -> Result<Self::Connection, Self::Error> {
+    let db_path = self.db_path.clone();
+    let connection_name = self.connection_name.clone();
+
+    let conn = task::spawn_blocking(move || {
+      Connection::open(&db_path).unwrap_or_else(|err| {
+        panic!(
+          "Failed to open SQLite database at '{}' for connection '{}': {}",
+          db_path, connection_name, err
+        )
+      })
+    })
+    .await
+    .map_err(|e| SqlitePoolError(format!("Failed to spawn blocking task: {e}")))?;
+
+    Ok(SqliteConnection {
+      conn: Arc::new(Mutex::new(conn)),
+    })
+  }
+
+  async fn is_valid(&self, conn: &mut Self::Connection) -> Result<(), Self::Error> {
+    let inner = conn.conn.clone();
+    task::spawn_blocking(move || {
+      let conn = inner.lock().unwrap();
+      conn
+        .execute_batch("SELECT 1")
+        .map_err(|e| SqlitePoolError(format!("SQLite connection validation failed: {e}")))
+    })
+    .await
+    .map_err(|e| SqlitePoolError(format!("Failed to spawn blocking task: {e}")))?
+  }
+
+  fn has_broken(&self, _conn: &mut Self::Connection) -> bool {
+    false
+  }
+}