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use std::error::Error as StdError;
use std::fmt;
use tokio::io::{AsyncRead, AsyncWrite};
use super::{HttpService, Service};
use crate::body::HttpBody;
use crate::common::{task, Future, Poll};
// The same "trait alias" as tower::MakeConnection, but inlined to reduce
// dependencies.
pub trait MakeConnection<Target>: self::sealed::Sealed<(Target,)> {
type Connection: AsyncRead + AsyncWrite;
type Error;
type Future: Future<Output = Result<Self::Connection, Self::Error>>;
fn poll_ready(&mut self, cx: &mut task::Context<'_>) -> Poll<Result<(), Self::Error>>;
fn make_connection(&mut self, target: Target) -> Self::Future;
}
impl<S, Target> self::sealed::Sealed<(Target,)> for S where S: Service<Target> {}
impl<S, Target> MakeConnection<Target> for S
where
S: Service<Target>,
S::Response: AsyncRead + AsyncWrite,
{
type Connection = S::Response;
type Error = S::Error;
type Future = S::Future;
fn poll_ready(&mut self, cx: &mut task::Context<'_>) -> Poll<Result<(), Self::Error>> {
Service::poll_ready(self, cx)
}
fn make_connection(&mut self, target: Target) -> Self::Future {
Service::call(self, target)
}
}
// Just a sort-of "trait alias" of `MakeService`, not to be implemented
// by anyone, only used as bounds.
pub trait MakeServiceRef<Target, ReqBody>: self::sealed::Sealed<(Target, ReqBody)> {
type ResBody: HttpBody;
type Error: Into<Box<dyn StdError + Send + Sync>>;
type Service: HttpService<ReqBody, ResBody = Self::ResBody, Error = Self::Error>;
type MakeError: Into<Box<dyn StdError + Send + Sync>>;
type Future: Future<Output = Result<Self::Service, Self::MakeError>>;
// Acting like a #[non_exhaustive] for associated types of this trait.
//
// Basically, no one outside of hyper should be able to set this type
// or declare bounds on it, so it should prevent people from creating
// trait objects or otherwise writing code that requires using *all*
// of the associated types.
//
// Why? So we can add new associated types to this alias in the future,
// if necessary.
type __DontNameMe: self::sealed::CantImpl;
fn poll_ready_ref(&mut self, cx: &mut task::Context<'_>) -> Poll<Result<(), Self::MakeError>>;
fn make_service_ref(&mut self, target: &Target) -> Self::Future;
}
impl<T, Target, E, ME, S, F, IB, OB> MakeServiceRef<Target, IB> for T
where
T: for<'a> Service<&'a Target, Error = ME, Response = S, Future = F>,
E: Into<Box<dyn StdError + Send + Sync>>,
ME: Into<Box<dyn StdError + Send + Sync>>,
S: HttpService<IB, ResBody = OB, Error = E>,
F: Future<Output = Result<S, ME>>,
IB: HttpBody,
OB: HttpBody,
{
type Error = E;
type Service = S;
type ResBody = OB;
type MakeError = ME;
type Future = F;
type __DontNameMe = self::sealed::CantName;
fn poll_ready_ref(&mut self, cx: &mut task::Context<'_>) -> Poll<Result<(), Self::MakeError>> {
self.poll_ready(cx)
}
fn make_service_ref(&mut self, target: &Target) -> Self::Future {
self.call(target)
}
}
impl<T, Target, S, B1, B2> self::sealed::Sealed<(Target, B1)> for T
where
T: for<'a> Service<&'a Target, Response = S>,
S: HttpService<B1, ResBody = B2>,
B1: HttpBody,
B2: HttpBody,
{
}
/// Create a `MakeService` from a function.
///
/// # Example
///
/// ```
/// # #[cfg(feature = "runtime")]
/// # async fn run() {
/// use std::convert::Infallible;
/// use hyper::{Body, Request, Response, Server};
/// use hyper::server::conn::AddrStream;
/// use hyper::service::{make_service_fn, service_fn};
///
/// let addr = ([127, 0, 0, 1], 3000).into();
///
/// let make_svc = make_service_fn(|socket: &AddrStream| {
/// let remote_addr = socket.remote_addr();
/// async move {
/// Ok::<_, Infallible>(service_fn(move |_: Request<Body>| async move {
/// Ok::<_, Infallible>(
/// Response::new(Body::from(format!("Hello, {}!", remote_addr)))
/// )
/// }))
/// }
/// });
///
/// // Then bind and serve...
/// let server = Server::bind(&addr)
/// .serve(make_svc);
///
/// // Finally, spawn `server` onto an Executor...
/// if let Err(e) = server.await {
/// eprintln!("server error: {}", e);
/// }
/// # }
/// # fn main() {}
/// ```
pub fn make_service_fn<F, Target, Ret>(f: F) -> MakeServiceFn<F>
where
F: FnMut(&Target) -> Ret,
Ret: Future,
{
MakeServiceFn { f }
}
/// `MakeService` returned from [`make_service_fn`]
#[derive(Clone, Copy)]
pub struct MakeServiceFn<F> {
f: F,
}
impl<'t, F, Ret, Target, Svc, MkErr> Service<&'t Target> for MakeServiceFn<F>
where
F: FnMut(&Target) -> Ret,
Ret: Future<Output = Result<Svc, MkErr>>,
MkErr: Into<Box<dyn StdError + Send + Sync>>,
{
type Error = MkErr;
type Response = Svc;
type Future = Ret;
fn poll_ready(&mut self, _cx: &mut task::Context<'_>) -> Poll<Result<(), Self::Error>> {
Poll::Ready(Ok(()))
}
fn call(&mut self, target: &'t Target) -> Self::Future {
(self.f)(target)
}
}
impl<F> fmt::Debug for MakeServiceFn<F> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("MakeServiceFn").finish()
}
}
mod sealed {
pub trait Sealed<X> {}
#[allow(unreachable_pub)] // This is intentional.
pub trait CantImpl {}
#[allow(missing_debug_implementations)]
pub enum CantName {}
impl CantImpl for CantName {}
}
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