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use std::error::Error as StdError;
use crate::body::HttpBody;
use crate::common::{task, Future, Poll};
use crate::{Request, Response};
/// An asynchronous function from `Request` to `Response`.
pub trait HttpService<ReqBody>: sealed::Sealed<ReqBody> {
/// The `HttpBody` body of the `http::Response`.
type ResBody: HttpBody;
/// The error type that can occur within this `Service`.
///
/// Note: Returning an `Error` to a hyper server will cause the connection
/// to be abruptly aborted. In most cases, it is better to return a `Response`
/// with a 4xx or 5xx status code.
type Error: Into<Box<dyn StdError + Send + Sync>>;
/// The `Future` returned by this `Service`.
type Future: Future<Output = Result<Response<Self::ResBody>, Self::Error>>;
#[doc(hidden)]
fn poll_ready(&mut self, cx: &mut task::Context<'_>) -> Poll<Result<(), Self::Error>>;
#[doc(hidden)]
fn call(&mut self, req: Request<ReqBody>) -> Self::Future;
}
impl<T, B1, B2> HttpService<B1> for T
where
T: tower_service::Service<Request<B1>, Response = Response<B2>>,
B2: HttpBody,
T::Error: Into<Box<dyn StdError + Send + Sync>>,
{
type ResBody = B2;
type Error = T::Error;
type Future = T::Future;
fn poll_ready(&mut self, cx: &mut task::Context<'_>) -> Poll<Result<(), Self::Error>> {
tower_service::Service::poll_ready(self, cx)
}
fn call(&mut self, req: Request<B1>) -> Self::Future {
tower_service::Service::call(self, req)
}
}
impl<T, B1, B2> sealed::Sealed<B1> for T
where
T: tower_service::Service<Request<B1>, Response = Response<B2>>,
B2: HttpBody,
{
}
mod sealed {
pub trait Sealed<T> {}
}