ntex 4.0.0-beta.10

Framework for composable network services
Documentation 
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use std::marker::PhantomData;

use crate::error::Failure;
use crate::service::{Ctx, Middleware, Service, ServiceFactory};
use crate::web::{AppState, WebError, WebRequest, WebResponse, WebResponseError};

/// Stack of middlewares.
#[derive(Debug, Clone)]
pub struct WebStack<St, Inner, Outer> {
    inner: Inner,
    outer: Outer,
    err: PhantomData<St>,
}

impl<St, Inner, Outer> WebStack<St, Inner, Outer> {
    pub fn new(inner: Inner, outer: Outer) -> Self {
        WebStack {
            inner,
            outer,
            err: PhantomData,
        }
    }
}

impl<S, St, Inner, Outer> Middleware<S, St> for WebStack<St, Inner, Outer>
where
    St: AppState,
    Inner: Middleware<S, St>,
    Outer: Middleware<Inner::Service, St>,
    // Outer::Service: Service<St, WebRequest<In>, Res = WebResponse>,
{
    type Service = WebMiddleware<Outer::Service, St>;

    fn create(&self, st: &St, service: S) -> Self::Service {
        WebMiddleware {
            svc: self.outer.create(st, self.inner.create(st, service)),
            err: PhantomData,
        }
    }
}

#[derive(Debug)]
pub struct WebMiddleware<S, St> {
    svc: S,
    err: PhantomData<St>,
}

impl<S, St> Clone for WebMiddleware<S, St>
where
    S: Clone,
{
    fn clone(&self) -> Self {
        Self {
            svc: self.svc.clone(),
            err: PhantomData,
        }
    }
}

impl<S, St, In> Service<St, WebRequest<In>> for WebMiddleware<S, St>
where
    S: Service<St, WebRequest<In>, Res = WebResponse>,
    S::Error: WebResponseError<St, St::Error>,
    St: AppState,
{
    type Res = WebResponse;
    type Error = WebError<St, St::Error>;

    #[inline]
    async fn call(
        &self,
        req: WebRequest<In>,
        ctx: Ctx<'_, Self, St>,
    ) -> Result<Self::Res, Self::Error> {
        ctx.call(&self.svc, req).await.map_err(WebError::from_err)
    }

    crate::forward_ready!(St, svc, WebError::from_err);
    crate::forward_shutdown!(St, svc);
}

#[derive(derive_more::Debug)]
#[debug("Filter")]
pub struct Filter<St, In>(PhantomData<(St, In)>);

impl<St, In> Filter<St, In> {
    pub(super) fn new() -> Self {
        Filter(PhantomData)
    }
}

impl<St: AppState, In> ServiceFactory<St, WebRequest<In>> for Filter<St, In> {
    type Res = WebRequest<In>;
    type Error = WebError<St, St::Error>;

    type Service = Filter<St, In>;
    type InitError = Failure;

    async fn create(&self, _: &St) -> Result<Self::Service, Self::InitError> {
        Ok(Filter(PhantomData))
    }
}

impl<St: AppState, In> Service<St, WebRequest<In>> for Filter<St, In> {
    type Res = WebRequest<In>;
    type Error = WebError<St, St::Error>;

    async fn call(
        &self,
        req: WebRequest<In>,
        _: Ctx<'_, Self, St>,
    ) -> Result<Self::Res, Self::Error> {
        Ok(req)
    }
}