+const FETCH_LIMIT_DEFAULT: i64 = 10;
+pub const FETCH_LIMIT_MAX: i64 = 50;
+const POOL_TIMEOUT: Option<Duration> = Some(Duration::from_secs(5));
+
+pub type ActualDbPool = Pool<AsyncPgConnection>;
+
+/// References a pool or connection. Functions must take `&mut DbPool<'_>` to allow implicit reborrowing.
+///
+/// https://github.com/rust-lang/rfcs/issues/1403
+pub enum DbPool<'a> {
+ Pool(&'a ActualDbPool),
+ Conn(&'a mut AsyncPgConnection),
+}
+
+pub enum DbConn<'a> {
+ Pool(PooledConnection<AsyncPgConnection>),
+ Conn(&'a mut AsyncPgConnection),
+}
+
+pub async fn get_conn<'a, 'b: 'a>(pool: &'a mut DbPool<'b>) -> Result<DbConn<'a>, DieselError> {
+ Ok(match pool {
+ DbPool::Pool(pool) => DbConn::Pool(pool.get().await.map_err(|e| QueryBuilderError(e.into()))?),
+ DbPool::Conn(conn) => DbConn::Conn(conn),
+ })
+}
+
+impl<'a> Deref for DbConn<'a> {
+ type Target = AsyncPgConnection;
+
+ fn deref(&self) -> &Self::Target {
+ match self {
+ DbConn::Pool(conn) => conn.deref(),
+ DbConn::Conn(conn) => conn.deref(),
+ }
+ }
+}
+
+impl<'a> DerefMut for DbConn<'a> {
+ fn deref_mut(&mut self) -> &mut Self::Target {
+ match self {
+ DbConn::Pool(conn) => conn.deref_mut(),
+ DbConn::Conn(conn) => conn.deref_mut(),
+ }
+ }
+}
+
+// Allows functions that take `DbPool<'_>` to be called in a transaction by passing `&mut conn.into()`
+impl<'a> From<&'a mut AsyncPgConnection> for DbPool<'a> {
+ fn from(value: &'a mut AsyncPgConnection) -> Self {
+ DbPool::Conn(value)
+ }
+}
+
+impl<'a, 'b: 'a> From<&'a mut DbConn<'b>> for DbPool<'a> {
+ fn from(value: &'a mut DbConn<'b>) -> Self {
+ DbPool::Conn(value.deref_mut())
+ }
+}
+
+impl<'a> From<&'a ActualDbPool> for DbPool<'a> {
+ fn from(value: &'a ActualDbPool) -> Self {
+ DbPool::Pool(value)
+ }
+}
+
+/// Runs multiple async functions that take `&mut DbPool<'_>` as input and return `Result`. Only works when the `futures` crate is listed in `Cargo.toml`.
+///
+/// `$pool` is the value given to each function.
+///
+/// A `Result` is returned (not in a `Future`, so don't use `.await`). The `Ok` variant contains a tuple with the values returned by the given functions.
+///
+/// The functions run concurrently if `$pool` has the `DbPool::Pool` variant.
+#[macro_export]
+macro_rules! try_join_with_pool {
+ ($pool:ident => ($($func:expr),+)) => {{
+ // Check type
+ let _: &mut $crate::utils::DbPool<'_> = $pool;
+
+ match $pool {
+ // Run concurrently with `try_join`
+ $crate::utils::DbPool::Pool(__pool) => ::futures::try_join!(
+ $(async {
+ let mut __dbpool = $crate::utils::DbPool::Pool(__pool);
+ ($func)(&mut __dbpool).await
+ }),+
+ ),
+ // Run sequentially
+ $crate::utils::DbPool::Conn(__conn) => async {
+ Ok(($({
+ let mut __dbpool = $crate::utils::DbPool::Conn(__conn);
+ // `?` prevents the error type from being inferred in an `async` block, so `match` is used instead
+ match ($func)(&mut __dbpool).await {
+ ::core::result::Result::Ok(__v) => __v,
+ ::core::result::Result::Err(__v) => return ::core::result::Result::Err(__v),
+ }
+ }),+))
+ }.await,
+ }
+ }};
+}