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use {
crate::{error::Error, future::TryFuture, handler::AllowedMethods, input::Input},
http::{Method, StatusCode},
};
pub trait Endpoint<T> {
type Output;
type Error: Into<Error>;
type Future: TryFuture<Ok = Self::Output, Error = Self::Error>;
fn apply(&self, args: T, cx: &mut ApplyContext<'_, '_>) -> ApplyResult<T, Self>;
fn allowed_methods(&self) -> Option<AllowedMethods>;
}
#[derive(Debug)]
pub struct ApplyContext<'a, 'task: 'a> {
input: &'a mut Input<'task>,
}
impl<'a, 'task> ApplyContext<'a, 'task> {
pub(crate) fn new(input: &'a mut Input<'task>) -> Self {
Self { input }
}
#[inline]
pub fn method(&self) -> &Method {
self.input.request.method()
}
}
#[derive(Debug)]
pub struct ApplyError(());
impl ApplyError {
#[inline]
pub fn method_not_allowed() -> ApplyError {
ApplyError(())
}
}
impl From<ApplyError> for Error {
fn from(_err: ApplyError) -> Self {
StatusCode::METHOD_NOT_ALLOWED.into()
}
}
pub type ApplyResult<T, E> = Result<<E as Endpoint<T>>::Future, (T, ApplyError)>;
pub fn endpoint<T, R>(
apply: impl Fn(T, &mut ApplyContext<'_, '_>) -> Result<R, (T, ApplyError)>,
allowed_methods: Option<AllowedMethods>,
) -> impl Endpoint<T, Output = R::Ok, Error = R::Error, Future = R>
where
R: TryFuture,
{
#[allow(missing_debug_implementations)]
struct ApplyFn<F> {
apply: F,
allowed_methods: Option<AllowedMethods>,
}
impl<F, T, R> Endpoint<T> for ApplyFn<F>
where
F: Fn(T, &mut ApplyContext<'_, '_>) -> Result<R, (T, ApplyError)>,
R: TryFuture,
{
type Output = R::Ok;
type Error = R::Error;
type Future = R;
#[inline]
fn apply(&self, args: T, cx: &mut ApplyContext<'_, '_>) -> ApplyResult<T, Self> {
(self.apply)(args, cx)
}
#[inline]
fn allowed_methods(&self) -> Option<AllowedMethods> {
self.allowed_methods.clone()
}
}
ApplyFn {
apply,
allowed_methods,
}
}
impl<E, T> Endpoint<T> for std::rc::Rc<E>
where
E: Endpoint<T>,
{
type Output = E::Output;
type Error = E::Error;
type Future = E::Future;
#[inline]
fn apply(&self, args: T, cx: &mut ApplyContext<'_, '_>) -> ApplyResult<T, Self> {
(**self).apply(args, cx)
}
#[inline]
fn allowed_methods(&self) -> Option<AllowedMethods> {
(**self).allowed_methods()
}
}
impl<E, T> Endpoint<T> for std::sync::Arc<E>
where
E: Endpoint<T>,
{
type Output = E::Output;
type Error = E::Error;
type Future = E::Future;
#[inline]
fn apply(&self, args: T, cx: &mut ApplyContext<'_, '_>) -> ApplyResult<T, Self> {
(**self).apply(args, cx)
}
#[inline]
fn allowed_methods(&self) -> Option<AllowedMethods> {
(**self).allowed_methods()
}
}
mod impl_chain {
use {
super::{ApplyContext, ApplyResult, Endpoint},
crate::{
error::Error,
future::{Poll, TryFuture},
handler::AllowedMethods,
input::Input,
util::{Chain, Either},
},
};
impl<L, R, T> Endpoint<T> for Chain<L, R>
where
L: Endpoint<T>,
R: Endpoint<T>,
{
type Output = Either<L::Output, R::Output>;
type Error = Error;
type Future = ChainFuture<L::Future, R::Future>;
#[inline]
fn apply(&self, args: T, cx: &mut ApplyContext<'_, '_>) -> ApplyResult<T, Self> {
(self.left.apply(args, cx).map(ChainFuture::Left))
.or_else(|(args, _)| self.right.apply(args, cx).map(ChainFuture::Right))
}
#[inline]
fn allowed_methods(&self) -> Option<AllowedMethods> {
let left = self.left.allowed_methods()?;
let right = self.right.allowed_methods()?;
Some(left.iter().chain(right.iter()).cloned().collect())
}
}
#[derive(Debug)]
pub enum ChainFuture<L, R> {
Left(L),
Right(R),
}
impl<L, R> TryFuture for ChainFuture<L, R>
where
L: TryFuture,
R: TryFuture,
{
type Ok = Either<L::Ok, R::Ok>;
type Error = Error;
#[inline]
fn poll_ready(&mut self, input: &mut Input<'_>) -> Poll<Self::Ok, Self::Error> {
match self {
ChainFuture::Left(l) => l
.poll_ready(input)
.map(|x| x.map(Either::Left))
.map_err(Into::into),
ChainFuture::Right(r) => r
.poll_ready(input)
.map(|x| x.map(Either::Right))
.map_err(Into::into),
}
}
}
}