boluo_core/service/
or_else.rs

1use super::Service;
2
3/// [`or_else`]返回的服务。
4///
5/// [`or_else`]: crate::service::ServiceExt::or_else
6#[derive(Clone, Copy)]
7pub struct OrElse<S, F> {
8    service: S,
9    f: F,
10}
11
12impl<S, F> OrElse<S, F> {
13    /// 创建一个新的[`OrElse`]服务。
14    pub fn new(service: S, f: F) -> Self {
15        Self { service, f }
16    }
17}
18
19impl<S, F, Fut, Req, Err> Service<Req> for OrElse<S, F>
20where
21    S: Service<Req>,
22    F: Fn(S::Error) -> Fut + Send + Sync,
23    Fut: Future<Output = Result<S::Response, Err>> + Send,
24{
25    type Response = S::Response;
26    type Error = Err;
27
28    fn call(&self, req: Req) -> impl Future<Output = Result<Self::Response, Self::Error>> + Send {
29        let fut = self.service.call(req);
30        async move {
31            let err = match fut.await {
32                Ok(res) => return Ok(res),
33                Err(err) => err,
34            };
35            (self.f)(err).await
36        }
37    }
38}
39
40impl<S, F> std::fmt::Debug for OrElse<S, F>
41where
42    S: std::fmt::Debug,
43{
44    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
45        f.debug_struct("OrElse")
46            .field("service", &self.service)
47            .field("f", &std::any::type_name::<F>())
48            .finish()
49    }
50}
boluo_core/service/or_else.rs

boluo_core/service/
or_else.rs
