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use super::Layer;
use std::fmt;
/// A no-op middleware.
///
/// When wrapping a [`Service`], the [`Identity`] layer returns the provided
/// service without modifying it.
///
/// [`Service`]: https://docs.rs/tower-service/latest/tower_service/trait.Service.html
#[derive(Default, Clone)]
pub struct Identity {
_p: (),
}
impl Identity {
/// Create a new [`Identity`] value
pub const fn new() -> Identity {
Identity { _p: () }
}
}
/// Decorates a [`Service`], transforming either the request or the response.
///
/// [`Service`]: https://docs.rs/tower-service/latest/tower_service/trait.Service.html
impl<S> Layer<S> for Identity {
type Service = S;
fn layer(&self, inner: S) -> Self::Service {
inner
}
}
impl fmt::Debug for Identity {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Identity").finish()
}
}