use crate::BoxError;
use std::future::Future;
pub trait AsyncPredicate<Request> {
type Future: Future<Output = Result<Self::Request, BoxError>>;
type Request;
fn check(&mut self, request: Request) -> Self::Future;
}
pub trait Predicate<Request> {
type Request;
fn check(&mut self, request: Request) -> Result<Self::Request, BoxError>;
}
impl<F, T, U, R, E> AsyncPredicate<T> for F
where
F: FnMut(T) -> U,
U: Future<Output = Result<R, E>>,
E: Into<BoxError>,
{
type Future = futures_util::future::ErrInto<U, BoxError>;
type Request = R;
fn check(&mut self, request: T) -> Self::Future {
use futures_util::TryFutureExt;
self(request).err_into()
}
}
impl<F, T, R, E> Predicate<T> for F
where
F: FnMut(T) -> Result<R, E>,
E: Into<BoxError>,
{
type Request = R;
fn check(&mut self, request: T) -> Result<Self::Request, BoxError> {
self(request).map_err(Into::into)
}
}