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use super::{AsyncFilter, Filter};
use tower_layer::Layer;
/// Conditionally dispatch requests to the inner service based on a synchronous
/// [predicate].
///
/// This [`Layer`] produces instances of the [`Filter`] service.
///
/// [predicate]: crate::filter::Predicate
/// [`Layer`]: crate::Layer
/// [`Filter`]: crate::filter::Filter
#[derive(Debug, Clone)]
pub struct FilterLayer<U> {
predicate: U,
}
/// Conditionally dispatch requests to the inner service based on an asynchronous
/// [predicate].
///
/// This [`Layer`] produces instances of the [`AsyncFilter`] service.
///
/// [predicate]: crate::filter::AsyncPredicate
/// [`Layer`]: crate::Layer
/// [`Filter`]: crate::filter::AsyncFilter
#[derive(Debug)]
pub struct AsyncFilterLayer<U> {
predicate: U,
}
// === impl FilterLayer ===
impl<U> FilterLayer<U> {
/// Returns a new layer that produces [`Filter`] services with the given
/// [`Predicate`].
///
/// [`Predicate`]: crate::filter::Predicate
/// [`Filter`]: crate::filter::Filter
pub fn new(predicate: U) -> Self {
Self { predicate }
}
}
impl<U: Clone, S> Layer<S> for FilterLayer<U> {
type Service = Filter<S, U>;
fn layer(&self, service: S) -> Self::Service {
let predicate = self.predicate.clone();
Filter::new(service, predicate)
}
}
// === impl AsyncFilterLayer ===
impl<U> AsyncFilterLayer<U> {
/// Returns a new layer that produces [`AsyncFilter`] services with the given
/// [`AsyncPredicate`].
///
/// [`AsyncPredicate`]: crate::filter::AsyncPredicate
/// [`Filter`]: crate::filter::Filter
pub fn new(predicate: U) -> Self {
Self { predicate }
}
}
impl<U: Clone, S> Layer<S> for AsyncFilterLayer<U> {
type Service = AsyncFilter<S, U>;
fn layer(&self, service: S) -> Self::Service {
let predicate = self.predicate.clone();
AsyncFilter::new(service, predicate)
}
}