1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
use super::BoxFuture;
use crate::{Context, Response};
pub trait Extract: Sized {
type Error: Into<Response>;
fn extract(cx: &mut Context) -> BoxFuture<'_, Result<Self, Self::Error>>;
}
impl<T> Extract for Option<T>
where
T: Extract,
{
type Error = T::Error;
fn extract(cx: &mut Context) -> BoxFuture<'_, Result<Self, Self::Error>> {
Box::pin(async move { Ok(T::extract(cx).await.ok()) })
}
}
impl<T> Extract for Result<T, T::Error>
where
T: Extract,
{
type Error = T::Error;
fn extract(cx: &mut Context) -> BoxFuture<'_, Result<Self, Self::Error>> {
Box::pin(async move { Ok(T::extract(cx).await) })
}
}