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use futures::{Future, Poll};
use crate::transform_map_err::{TransformMapErr, TransformMapErrNewTransform};
use crate::Service;
pub trait Transform<Service> {
type Request;
type Response;
type Error;
type Future: Future<Item = Self::Response, Error = Self::Error>;
fn poll_ready(&mut self) -> Poll<(), Self::Error>;
fn call(&mut self, request: Self::Request, service: &mut Service) -> Self::Future;
fn map_err<F, E>(self, f: F) -> TransformMapErr<Self, Service, F, E>
where
Self: Sized,
F: Fn(Self::Error) -> E,
{
TransformMapErr::new(self, f)
}
}
pub trait NewTransform<Service> {
type Request;
type Response;
type Error;
type Transform: Transform<
Service,
Request = Self::Request,
Response = Self::Response,
Error = Self::Error,
>;
type InitError;
type Future: Future<Item = Self::Transform, Error = Self::InitError>;
fn new_transform(&self) -> Self::Future;
fn map_err<F, E>(self, f: F) -> TransformMapErrNewTransform<Self, Service, F, E>
where
Self: Sized,
F: Fn(Self::Error) -> E,
{
TransformMapErrNewTransform::new(self, f)
}
}
impl<'a, T, S> Transform<S> for &'a mut T
where
T: Transform<S> + 'a,
S: Service<Error = T::Error>,
{
type Request = T::Request;
type Response = T::Response;
type Error = T::Error;
type Future = T::Future;
fn poll_ready(&mut self) -> Poll<(), T::Error> {
(**self).poll_ready()
}
fn call(&mut self, request: Self::Request, service: &mut S) -> T::Future {
(**self).call(request, service)
}
}
impl<T, S> Transform<S> for Box<T>
where
T: Transform<S> + ?Sized,
S: Service<Error = T::Error>,
{
type Request = T::Request;
type Response = T::Response;
type Error = T::Error;
type Future = T::Future;
fn poll_ready(&mut self) -> Poll<(), S::Error> {
(**self).poll_ready()
}
fn call(&mut self, request: Self::Request, service: &mut S) -> T::Future {
(**self).call(request, service)
}
}
pub trait IntoTransform<T, S>
where
T: Transform<S>,
{
fn into_transform(self) -> T;
}
pub trait IntoNewTransform<T, S>
where
T: NewTransform<S>,
{
fn into_new_transform(self) -> T;
}
impl<T, S> IntoTransform<T, S> for T
where
T: Transform<S>,
{
fn into_transform(self) -> T {
self
}
}
impl<T, S> IntoNewTransform<T, S> for T
where
T: NewTransform<S>,
{
fn into_new_transform(self) -> T {
self
}
}