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use mlua::{ExternalError, LuaSerdeExt, UserData};
use sqlx::{Pool, Postgres, Row, Sqlite, migrate::MigrateDatabase};
use std::{str::FromStr, sync::LazyLock};
use tokio::sync::Mutex;
#[derive(Debug, Clone, serde::Deserialize)]
struct AstraSQLConnectionOption {
max_connections: Option<u32>,
extensions: Vec<String>,
extensions_with_entrypoint: Vec<(String, String)>,
is_immutable: bool,
other_options: Vec<(String, String)>,
}
pub static DATABASE_POOLS: LazyLock<Mutex<Vec<DatabaseType>>> =
LazyLock::new(|| Mutex::new(Vec::new()));
#[derive(Debug, Clone)]
pub enum DatabaseType {
Sqlite(Pool<Sqlite>),
Postgres(Pool<Postgres>),
}
#[derive(Debug, Clone)]
pub struct Database {
pub db: Option<DatabaseType>,
}
impl Database {
pub fn register_to_lua(lua: &mlua::Lua) -> mlua::Result<()> {
let database_constructor = lua.create_async_function(
|lua,
(database_type, url, connection_options): (
String,
String,
mlua::Value,
)| async move {
let connection_options = lua.from_value::<AstraSQLConnectionOption>(connection_options)?;
let max_connections = connection_options.max_connections.unwrap_or(10);
// pre checkup
if database_type == *"sqlite" {
match Sqlite::database_exists(url.as_str()).await {
Ok(exists) => {
if !exists {
match Sqlite::create_database(url.as_str()).await {
Ok(()) => {}
Err(e) => println!("Error creating the Sqlite DB: {e:#?}"),
}
}
}
Err(e) => println!("Error checking if the Sqlite DB exists: {e:#?}"),
}
}
match database_type.as_str() {
"sqlite" => {
match sqlx::sqlite::SqliteConnectOptions::from_str(
format!("sqlite:{url}").as_str(),
) {
Ok(options) => {
let mut options = options.create_if_missing(true);
for i in connection_options.extensions {
options = options.extension(i)
}
for (name, entry_point) in
connection_options.extensions_with_entrypoint
{
options = options.extension_with_entrypoint(name, entry_point)
}
options = options.immutable(connection_options.is_immutable);
match sqlx::sqlite::SqlitePoolOptions::new()
.max_connections(max_connections)
.connect_with(options)
.await
{
Ok(pool) => {
let pool = DatabaseType::Sqlite(pool);
let mut database_pools = DATABASE_POOLS.lock().await;
database_pools.push(pool.clone());
Ok(Database { db: Some(pool) })
}
Err(e) => Err(mlua::Error::runtime(format!(
"Error connecting to Sqlite: {e:#?}"
))),
}
}
Err(e) => Err(e.into_lua_err()),
}
}
"postgres" => {
//
match sqlx::postgres::PgConnectOptions::from_str(url.as_str()) {
Ok(options) => {
match sqlx::postgres::PgPoolOptions::new()
.max_connections(max_connections)
.connect_with(options.options(connection_options.other_options))
.await
{
Ok(pool) => {
let pool = DatabaseType::Postgres(pool);
let mut database_pools = DATABASE_POOLS.lock().await;
database_pools.push(pool.clone());
Ok(Database { db: Some(pool) })
}
Err(e) => Err(mlua::Error::runtime(format!(
"Error connecting to Postgres: {e:#?}"
))),
}
}
Err(e) => Err(e.into_lua_err()),
}
}
_ => Err(mlua::Error::runtime(
"Could not recognize the database type",
)),
}
},
)?;
lua.globals()
.set("astra_internal__database_connect", database_constructor)?;
Ok(())
}
}
impl UserData for Database {
fn add_methods<M: mlua::UserDataMethods<Self>>(methods: &mut M) {
macro_rules! parse_sql_fn {
($function_name:ident, $row_type:ty) => {
fn $function_name(lua: &mlua::Lua, row: &$row_type) -> mlua::Result<mlua::Table> {
use sqlx::Column;
let table = lua.create_table()?;
macro_rules! try_set_value {
($i:expr, $key:expr, $ty:ty) => {
if let Ok(v) = row.try_get::<$ty, _>($i) {
table.set($key, v)?;
continue;
} else if let Ok(v) = row.try_get::<Option<$ty>, _>($i) {
table.set($key, v)?;
continue;
}
};
}
macro_rules! try_set_lua_value {
($i:expr, $key:expr, $ty:ty) => {
if let Ok(v) = row.try_get::<$ty, _>($i) {
table.set($key, lua.to_value(&v)?)?;
continue;
} else if let Ok(v) = row.try_get::<Option<$ty>, _>($i) {
table.set($key, lua.to_value(&v)?)?;
continue;
}
};
}
for i in 0..row.len() {
let key = row.column(i).name();
try_set_value!(i, key, i64);
try_set_value!(i, key, i32);
try_set_value!(i, key, i16);
try_set_value!(i, key, i8);
try_set_value!(i, key, f32);
try_set_value!(i, key, f64);
try_set_value!(i, key, bool);
try_set_value!(i, key, String);
try_set_value!(i, key, Vec<u8>);
try_set_lua_value!(i, key, serde_json::Value);
try_set_lua_value!(i, key, chrono::DateTime<chrono::Utc>);
try_set_lua_value!(i, key, uuid::Uuid);
// fallback if all fail
table.set(key, mlua::Value::Nil)?;
}
Ok(table)
}
};
}
// This is because of the duplicated code that would break or
// become too complicated if traits are introduced.
//
// Maybe one day a better solution will be introduced.
parse_sql_fn!(parse_sql_to_lua_postgres, sqlx::postgres::PgRow);
parse_sql_fn!(parse_sql_to_lua_sqlite, sqlx::sqlite::SqliteRow);
macro_rules! query_builder_fn {
($function_name:ident, $return_type:ty) => {
#[allow(mismatched_lifetime_syntaxes)]
fn $function_name(
lua: mlua::Lua,
sql: &str,
parameters: Option<mlua::Table>,
) -> $return_type {
let mut query = sqlx::query(sql);
match parameters {
Some(param_values) => {
// turn parameters into actual values
for param in param_values
.sequence_values::<mlua::Value>()
.filter_map(|value| match value {
Ok(value) => Some(value),
Err(_) => None,
})
.collect::<Vec<_>>()
{
match param {
mlua::Value::String(value) => {
query = query.bind(value.to_string_lossy())
}
mlua::Value::Number(value) => query = query.bind(value),
mlua::Value::Integer(value) => query = query.bind(value),
mlua::Value::Boolean(value) => query = query.bind(value),
mlua::Value::Table(_) => {
if let Ok(json) =
lua.from_value::<serde_json::Value>(param.clone())
{
query = query.bind(json)
}
}
_ => {}
}
}
}
None => {}
};
query
}
};
}
query_builder_fn!(
query_builder_postgres,
sqlx::query::Query<'_, sqlx::Postgres, sqlx::postgres::PgArguments>
);
query_builder_fn!(
query_builder_sqlite,
sqlx::query::Query<'_, sqlx::Sqlite, sqlx::sqlite::SqliteArguments>
);
methods.add_async_method(
"execute",
|lua, this, (sql, parameters): (String, Option<mlua::Table>)| async move {
match &this.db {
Some(db) => match &db {
DatabaseType::Sqlite(pool) => {
let query = query_builder_sqlite(lua.clone(), &sql, parameters);
match query.execute(pool).await {
Ok(_) => Ok(()),
Err(e) => Err(mlua::Error::runtime(format!(
"Error executing the query: {e:#?}"
))),
}
}
DatabaseType::Postgres(pool) => {
let query = query_builder_postgres(lua.clone(), &sql, parameters);
match query.execute(pool).await {
Ok(_) => Ok(()),
Err(e) => Err(mlua::Error::runtime(format!(
"Error executing the query: {e:#?}"
))),
}
}
},
None => Err(mlua::Error::runtime("The connection is closed")),
}
},
);
macro_rules! query_pragma {
($type:ty, $lua:ident, $sql:ident, $db:ident) => {
match &$db {
DatabaseType::Sqlite(pool) => {
match sqlx::query_scalar::<_, $type>(&$sql)
.fetch_optional(pool)
.await
{
Ok(row) => {
if let Some(row) = row {
$lua.to_value(&row)
} else {
Ok(mlua::Value::Nil)
}
}
Err(e) => Err(e.into_lua_err()),
}
}
DatabaseType::Postgres(pool) => {
match sqlx::query_scalar::<_, $type>(&$sql)
.fetch_optional(pool)
.await
{
Ok(row) => {
if let Some(row) = row {
$lua.to_value(&row)
} else {
Ok(mlua::Value::Nil)
}
}
Err(e) => Err(e.into_lua_err()),
}
}
}
};
}
methods.add_async_method("query_pragma_int", |lua, this, sql: String| async move {
match &this.db {
Some(db) => query_pragma!(i32, lua, sql, db), // returns NULL not nil
None => Err(mlua::Error::runtime("The connection is closed")),
}
});
methods.add_async_method("query_pragma_text", |lua, this, sql: String| async move {
match &this.db {
Some(db) => query_pragma!(String, lua, sql, db),
None => Err(mlua::Error::runtime("The connection is closed")),
}
});
methods.add_async_method(
"query_one",
|lua, this, (sql, parameters): (String, Option<mlua::Table>)| async move {
match &this.db {
Some(db) => match &db {
DatabaseType::Sqlite(pool) => {
let query = query_builder_sqlite(lua.clone(), &sql, parameters);
match query.fetch_one(pool).await {
Ok(row) => Ok(parse_sql_to_lua_sqlite(&lua, &row)?),
Err(e) => Err(mlua::Error::runtime(format!(
"Error executing the query: {e:#?}"
))),
}
}
DatabaseType::Postgres(pool) => {
let query = query_builder_postgres(lua.clone(), &sql, parameters);
match query.fetch_one(pool).await {
Ok(row) => Ok(parse_sql_to_lua_postgres(&lua, &row)?),
Err(e) => Err(mlua::Error::runtime(format!(
"Error executing the query: {e:#?}"
))),
}
}
},
None => Err(mlua::Error::runtime("The connection is closed")),
}
},
);
methods.add_async_method(
"query_all",
|lua, this, (sql, parameters): (String, Option<mlua::Table>)| async move {
match &this.db {
Some(db) => match &db {
DatabaseType::Sqlite(pool) => {
let query = query_builder_sqlite(lua.clone(), &sql, parameters);
match query.fetch_all(pool).await {
Ok(rows) => {
let mut vec = Vec::new();
for row in rows {
let sql_row_lua = parse_sql_to_lua_sqlite(&lua, &row)?;
vec.push(sql_row_lua);
}
Ok(vec)
}
Err(e) => Err(mlua::Error::runtime(format!(
"Error executing the query: {e:#?}"
))),
}
}
DatabaseType::Postgres(pool) => {
let query = query_builder_postgres(lua.clone(), &sql, parameters);
match query.fetch_all(pool).await {
Ok(rows) => {
let mut vec = Vec::new();
for row in rows {
let sql_row_lua = parse_sql_to_lua_postgres(&lua, &row)?;
vec.push(sql_row_lua);
}
Ok(vec)
}
Err(e) => Err(mlua::Error::runtime(format!(
"Error executing the query: {e:#?}"
))),
}
}
},
None => Err(mlua::Error::runtime("The connection is closed")),
}
},
);
methods.add_async_method_mut("close", |_, mut this, _: ()| async move {
if let Some(db) = &this.db {
match db {
DatabaseType::Sqlite(pool) => pool.close().await,
DatabaseType::Postgres(pool) => pool.close().await,
};
}
this.db = None;
Ok(())
});
}
}