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use std::error::Error as StdError;
use std::fmt;
use std::marker::PhantomData;
use crate::body::HttpBody;
use crate::common::{task, Future, Poll};
use crate::{Request, Response};
/// Create a `Service` from a function.
///
/// # Example
///
/// ```
/// use hyper::{Body, Request, Response, Version};
/// use hyper::service::service_fn;
///
/// let service = service_fn(|req: Request<Body>| async move {
/// if req.version() == Version::HTTP_11 {
/// Ok(Response::new(Body::from("Hello World")))
/// } else {
/// // Note: it's usually better to return a Response
/// // with an appropriate StatusCode instead of an Err.
/// Err("not HTTP/1.1, abort connection")
/// }
/// });
/// ```
pub fn service_fn<F, R, S>(f: F) -> ServiceFn<F, R>
where
F: FnMut(Request<R>) -> S,
S: Future,
{
ServiceFn {
f,
_req: PhantomData,
}
}
/// Service returned by [`service_fn`]
pub struct ServiceFn<F, R> {
f: F,
_req: PhantomData<fn(R)>,
}
impl<F, ReqBody, Ret, ResBody, E> tower_service::Service<crate::Request<ReqBody>>
for ServiceFn<F, ReqBody>
where
F: FnMut(Request<ReqBody>) -> Ret,
ReqBody: HttpBody,
Ret: Future<Output = Result<Response<ResBody>, E>>,
E: Into<Box<dyn StdError + Send + Sync>>,
ResBody: HttpBody,
{
type Response = crate::Response<ResBody>;
type Error = E;
type Future = Ret;
fn poll_ready(&mut self, _cx: &mut task::Context<'_>) -> Poll<Result<(), Self::Error>> {
Poll::Ready(Ok(()))
}
fn call(&mut self, req: Request<ReqBody>) -> Self::Future {
(self.f)(req)
}
}
impl<F, R> fmt::Debug for ServiceFn<F, R> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("impl Service").finish()
}
}
impl<F, R> Clone for ServiceFn<F, R>
where
F: Clone,
{
fn clone(&self) -> Self {
ServiceFn {
f: self.f.clone(),
_req: PhantomData,
}
}
}
impl<F, R> Copy for ServiceFn<F, R> where F: Copy {}