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use std::{future::Future, marker::PhantomData};
use crate::{Endpoint, IntoResponse, Request, Response, Result};
pub struct CatchError<E, F, R, ErrType> {
inner: E,
f: F,
_mark1: PhantomData<R>,
_mark2: PhantomData<ErrType>,
}
impl<E, F, R, ErrType> CatchError<E, F, R, ErrType> {
#[inline]
pub(crate) fn new(inner: E, f: F) -> CatchError<E, F, R, ErrType> {
Self {
inner,
f,
_mark1: PhantomData,
_mark2: PhantomData,
}
}
}
#[async_trait::async_trait]
impl<E, F, Fut, R, ErrType> Endpoint for CatchError<E, F, R, ErrType>
where
E: Endpoint,
F: Fn(ErrType) -> Fut + Send + Sync,
Fut: Future<Output = R> + Send,
R: IntoResponse + Send + Sync,
ErrType: std::error::Error + Send + Sync + 'static,
{
type Output = Response;
async fn call(&self, req: Request) -> Result<Self::Output> {
match self.inner.call(req).await {
Ok(resp) => Ok(resp.into_response()),
Err(err) if err.is::<ErrType>() => Ok((self.f)(err.downcast::<ErrType>().unwrap())
.await
.into_response()),
Err(err) => Err(err),
}
}
}