ntex-service 5.3.1

ntex service
Documentation 
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use std::{fmt, marker::PhantomData};

use super::ServiceFactory;

/// Service factory produced by the `map_init_err` combinator.
///
/// This is created by the `ServiceChainFactory::map_init_err()` method.
pub struct MapInitErr<F, Sf, Err> {
    f: F,
    sf: Sf,
    e: PhantomData<fn() -> Err>,
}

impl<F, Sf, Err> MapInitErr<F, Sf, Err> {
    /// Creates a new `MapInitErr` factory.
    pub(crate) fn new<St, Req>(f: F, sf: Sf) -> Self
    where
        Sf: ServiceFactory<St, Req>,
        F: Fn(Sf::InitError) -> Err,
    {
        Self {
            f,
            sf,
            e: PhantomData,
        }
    }
}

impl<F, Sf, Err> Clone for MapInitErr<F, Sf, Err>
where
    F: Clone,
    Sf: Clone,
{
    fn clone(&self) -> Self {
        Self {
            f: self.f.clone(),
            sf: self.sf.clone(),
            e: PhantomData,
        }
    }
}

impl<F, Sf, Err> fmt::Debug for MapInitErr<F, Sf, Err>
where
    Sf: fmt::Debug,
{
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("MapInitErr")
            .field("sf", &self.sf)
            .field("map", &std::any::type_name::<F>())
            .finish()
    }
}

impl<F, Sf, St, Req, Err> ServiceFactory<St, Req> for MapInitErr<F, Sf, Err>
where
    F: Fn(Sf::InitError) -> Err + Clone,
    Sf: ServiceFactory<St, Req>,
{
    type Res = Sf::Res;
    type Error = Sf::Error;

    type Service = Sf::Service;
    type InitError = Err;

    #[inline]
    async fn create(&self, st: &St) -> Result<Self::Service, Self::InitError> {
        self.sf.create(st).await.map_err(|e| (self.f)(e))
    }
}

#[cfg(test)]
#[path = "../tests/unit/map_init_err.rs"]
mod tests;