ntex_service/
map_init_err.rs

1use std::{fmt, marker::PhantomData};
2
3use super::ServiceFactory;
4
5/// `MapInitError` service combinator
6pub struct MapInitErr<F, Sf, Err> {
7    f: F,
8    sf: Sf,
9    e: PhantomData<fn() -> Err>,
10}
11
12impl<F, Sf, Err> MapInitErr<F, Sf, Err> {
13    /// Create new `MapInitErr` combinator
14    pub(crate) fn new<St, Req>(f: F, sf: Sf) -> Self
15    where
16        Sf: ServiceFactory<St, Req>,
17        F: Fn(Sf::InitError) -> Err,
18    {
19        Self {
20            f,
21            sf,
22            e: PhantomData,
23        }
24    }
25}
26
27impl<F, Sf, Err> Clone for MapInitErr<F, Sf, Err>
28where
29    F: Clone,
30    Sf: Clone,
31{
32    fn clone(&self) -> Self {
33        Self {
34            f: self.f.clone(),
35            sf: self.sf.clone(),
36            e: PhantomData,
37        }
38    }
39}
40
41impl<F, Sf, Err> fmt::Debug for MapInitErr<F, Sf, Err>
42where
43    Sf: fmt::Debug,
44{
45    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
46        f.debug_struct("MapInitErr")
47            .field("sf", &self.sf)
48            .field("map", &std::any::type_name::<F>())
49            .finish()
50    }
51}
52
53impl<F, Sf, St, Req, Err> ServiceFactory<St, Req> for MapInitErr<F, Sf, Err>
54where
55    F: Fn(Sf::InitError) -> Err + Clone,
56    Sf: ServiceFactory<St, Req>,
57{
58    type Res = Sf::Res;
59    type Error = Sf::Error;
60
61    type Service = Sf::Service;
62    type InitError = Err;
63
64    #[inline]
65    async fn create(&self, st: &St) -> Result<Self::Service, Self::InitError> {
66        self.sf.create(st).await.map_err(|e| (self.f)(e))
67    }
68}
69
70#[cfg(test)]
71mod tests {
72    use crate::{ServiceFactory, factory, fn_factory, fn_service};
73
74    #[ntex::test]
75    async fn map_init_err() {
76        let factory = factory(fn_factory(async move |err: &bool| {
77            if *err {
78                Err(())
79            } else {
80                Ok(fn_service(async |i: usize| Ok::<_, ()>(i * 2)))
81            }
82        }))
83        .map_init_err(|()| std::io::Error::other("err"))
84        .clone();
85
86        assert!(factory.create(&true).await.is_err());
87        assert!(factory.create(&false).await.is_ok());
88        let _ = format!("{factory:?}");
89    }
90
91    #[ntex::test]
92    async fn map_init_err2() {
93        let factory = factory(fn_factory(async |err: &bool| {
94            if *err {
95                Err(())
96            } else {
97                Ok(fn_service(async |i: usize| Ok::<_, ()>(i * 2)))
98            }
99        }))
100        .map_init_err(|()| std::io::Error::other("err"))
101        .clone();
102
103        assert!(factory.create(&true).await.is_err());
104        assert!(factory.create(&false).await.is_ok());
105        let _ = format!("{factory:?}");
106    }
107}
ntex_service/map_init_err.rs

ntex_service/
map_init_err.rs
