ntex_service/
map_init_err.rs

1use std::{fmt, marker::PhantomData};
2
3use super::ServiceFactory;
4
5/// `MapInitErr` service combinator
6pub struct MapInitErr<A, R, C, F, E> {
7    a: A,
8    f: F,
9    e: PhantomData<fn(R, C) -> E>,
10}
11
12impl<A, R, C, F, E> MapInitErr<A, R, C, F, E>
13where
14    A: ServiceFactory<R, C>,
15    F: Fn(A::InitError) -> E,
16{
17    /// Create new `MapInitErr` combinator
18    pub(crate) fn new(a: A, f: F) -> Self {
19        Self {
20            a,
21            f,
22            e: PhantomData,
23        }
24    }
25}
26
27impl<A, R, C, F, E> Clone for MapInitErr<A, R, C, F, E>
28where
29    A: Clone,
30    F: Clone,
31{
32    fn clone(&self) -> Self {
33        Self {
34            a: self.a.clone(),
35            f: self.f.clone(),
36            e: PhantomData,
37        }
38    }
39}
40
41impl<A, R, C, F, E> fmt::Debug for MapInitErr<A, R, C, F, E>
42where
43    A: fmt::Debug,
44{
45    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
46        f.debug_struct("MapInitErr")
47            .field("service", &self.a)
48            .field("map", &std::any::type_name::<F>())
49            .finish()
50    }
51}
52
53impl<A, R, C, F, E> ServiceFactory<R, C> for MapInitErr<A, R, C, F, E>
54where
55    A: ServiceFactory<R, C>,
56    F: Fn(A::InitError) -> E + Clone,
57{
58    type Response = A::Response;
59    type Error = A::Error;
60
61    type Service = A::Service;
62    type InitError = E;
63
64    #[inline]
65    async fn create(&self, cfg: C) -> Result<Self::Service, Self::InitError> {
66        self.a.create(cfg).await.map_err(|e| (self.f)(e))
67    }
68}
69
70#[cfg(test)]
71mod tests {
72    use crate::{chain_factory, fn_factory_with_config, fn_service, ServiceFactory};
73
74    #[ntex::test]
75    async fn map_init_err() {
76        let factory = chain_factory(fn_factory_with_config(|err: &bool| {
77            let err = *err;
78            async move {
79                if err {
80                    Err(())
81                } else {
82                    Ok(fn_service(|i: usize| async move { Ok::<_, ()>(i * 2) }))
83                }
84            }
85        }))
86        .map_init_err(|_| std::io::Error::new(std::io::ErrorKind::Other, "err"))
87        .clone();
88
89        assert!(factory.create(&true).await.is_err());
90        assert!(factory.create(&false).await.is_ok());
91        let _ = format!("{:?}", factory);
92    }
93
94    #[ntex::test]
95    async fn map_init_err2() {
96        let factory = fn_factory_with_config(|err: &bool| {
97            let err = *err;
98            async move {
99                if err {
100                    Err(())
101                } else {
102                    Ok(fn_service(|i: usize| async move { Ok::<_, ()>(i * 2) }))
103                }
104            }
105        })
106        .map_init_err(|_| std::io::Error::new(std::io::ErrorKind::Other, "err"))
107        .clone();
108
109        assert!(factory.create(&true).await.is_err());
110        assert!(factory.create(&false).await.is_ok());
111        let _ = format!("{:?}", factory);
112    }
113}
ntex_service/map_init_err.rs

ntex_service/
map_init_err.rs
