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
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
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)
}
}