surrealdb 3.3.1

A scalable, distributed, collaborative, document-graph database, for the realtime web
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use std::borrow::Cow;
use std::future::IntoFuture;

use crate::conn::ctx;
use crate::method::{BoxFuture, OnceLockExt, UseDb};
use crate::{Connection, Result, Surreal};

/// Returned by [`Surreal::use_ns`](crate::Surreal::use_ns), used to set the current namespace.
#[derive(Debug)]
#[must_use = "futures do nothing unless you `.await` or poll them"]
pub struct UseNs<'r, C: Connection> {
	pub(super) client: Cow<'r, Surreal<C>>,
	pub(super) ns: String,
}

impl<C> UseNs<'_, C>
where
	C: Connection,
{
	/// Converts to an owned type which can easily be moved to a different
	/// thread
	pub fn into_owned(self) -> UseNs<'static, C> {
		UseNs {
			client: Cow::Owned(self.client.into_owned()),
			..self
		}
	}
}

impl<'r, C> UseNs<'r, C>
where
	C: Connection,
{
	/// Switch to a specific database
	pub fn use_db(self, db: impl Into<String>) -> UseDb<'r, C> {
		UseDb {
			ns: self.ns.into(),
			db: db.into(),
			client: self.client,
		}
	}
}

impl<'r, Client> IntoFuture for UseNs<'r, Client>
where
	Client: Connection,
{
	type Output = Result<(Option<String>, Option<String>)>;
	type IntoFuture = BoxFuture<'r, Self::Output>;

	fn into_future(self) -> Self::IntoFuture {
		Box::pin(async move {
			let router = self.client.inner.router.extract()?;
			let result =
				router.engine.use_ns_db(ctx(self.client.session_id), Some(self.ns), None).await?;

			Ok(result)
		})
	}
}