composable-tower-http 0.3.1

Highly customizable http utilities built on top of tower.
Documentation 
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use http::HeaderMap;

pub trait HeaderExtractor {
    type Error;

    fn extract_header<'a>(&self, headers: &'a HeaderMap) -> Result<&'a str, Self::Error>;
}

pub trait HeaderExtractorExt: Sized + HeaderExtractor {
    fn map_err<Fn>(self, map_err: Fn) -> MapError<Self, Fn>;
}

impl<T> HeaderExtractorExt for T
where
    T: Sized + HeaderExtractor,
{
    fn map_err<Fn>(self, map_err: Fn) -> MapError<Self, Fn> {
        MapError::new(self, map_err)
    }
}

#[derive(Debug, Clone)]
pub struct MapError<T, Fn> {
    inner: T,
    map_err: Fn,
}

impl<T, Fn> MapError<T, Fn> {
    pub const fn new(inner: T, map_err: Fn) -> Self {
        Self { inner, map_err }
    }
}

impl<H, Fn, E> HeaderExtractor for MapError<H, Fn>
where
    H: HeaderExtractor + Sync,
    Fn: FnOnce(H::Error) -> E + Clone + Sync,
{
    type Error = E;

    fn extract_header<'a>(&self, headers: &'a HeaderMap) -> Result<&'a str, Self::Error> {
        self.inner
            .extract_header(headers)
            .map_err(self.map_err.clone())
    }
}