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use std::fmt;
use std::future::Future;
use std::pin::Pin;
use std::sync::Arc;
#[cfg(all(feature = "server", any(feature = "http1", feature = "http2")))]
use crate::body::Body;
#[cfg(feature = "server")]
use crate::body::HttpBody;
#[cfg(all(feature = "http2", feature = "server"))]
use crate::proto::h2::server::H2Stream;
use crate::rt::Executor;
#[cfg(all(feature = "server", any(feature = "http1", feature = "http2")))]
use crate::server::server::{new_svc::NewSvcTask, Watcher};
#[cfg(all(feature = "server", any(feature = "http1", feature = "http2")))]
use crate::service::HttpService;
#[cfg(feature = "server")]
pub trait ConnStreamExec<F, B: HttpBody>: Clone {
fn execute_h2stream(&mut self, fut: H2Stream<F, B>);
}
#[cfg(all(feature = "server", any(feature = "http1", feature = "http2")))]
pub trait NewSvcExec<I, N, S: HttpService<Body>, E, W: Watcher<I, S, E>>: Clone {
fn execute_new_svc(&mut self, fut: NewSvcTask<I, N, S, E, W>);
}
pub(crate) type BoxSendFuture = Pin<Box<dyn Future<Output = ()> + Send>>;
// Either the user provides an executor for background tasks, or we use
// `tokio::spawn`.
#[derive(Clone)]
pub enum Exec {
Default,
Executor(Arc<dyn Executor<BoxSendFuture> + Send + Sync>),
}
// ===== impl Exec =====
impl Exec {
pub(crate) fn execute<F>(&self, fut: F)
where
F: Future<Output = ()> + Send + 'static,
{
match *self {
Exec::Default => {
#[cfg(feature = "tcp")]
{
tokio::task::spawn(fut);
}
#[cfg(not(feature = "tcp"))]
{
// If no runtime, we need an executor!
panic!("executor must be set")
}
}
Exec::Executor(ref e) => {
e.execute(Box::pin(fut));
}
}
}
}
impl fmt::Debug for Exec {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Exec").finish()
}
}
#[cfg(feature = "server")]
impl<F, B> ConnStreamExec<F, B> for Exec
where
H2Stream<F, B>: Future<Output = ()> + Send + 'static,
B: HttpBody,
{
fn execute_h2stream(&mut self, fut: H2Stream<F, B>) {
self.execute(fut)
}
}
#[cfg(all(feature = "server", any(feature = "http1", feature = "http2")))]
impl<I, N, S, E, W> NewSvcExec<I, N, S, E, W> for Exec
where
NewSvcTask<I, N, S, E, W>: Future<Output = ()> + Send + 'static,
S: HttpService<Body>,
W: Watcher<I, S, E>,
{
fn execute_new_svc(&mut self, fut: NewSvcTask<I, N, S, E, W>) {
self.execute(fut)
}
}
// ==== impl Executor =====
#[cfg(feature = "server")]
impl<E, F, B> ConnStreamExec<F, B> for E
where
E: Executor<H2Stream<F, B>> + Clone,
H2Stream<F, B>: Future<Output = ()>,
B: HttpBody,
{
fn execute_h2stream(&mut self, fut: H2Stream<F, B>) {
self.execute(fut)
}
}
#[cfg(all(feature = "server", any(feature = "http1", feature = "http2")))]
impl<I, N, S, E, W> NewSvcExec<I, N, S, E, W> for E
where
E: Executor<NewSvcTask<I, N, S, E, W>> + Clone,
NewSvcTask<I, N, S, E, W>: Future<Output = ()>,
S: HttpService<Body>,
W: Watcher<I, S, E>,
{
fn execute_new_svc(&mut self, fut: NewSvcTask<I, N, S, E, W>) {
self.execute(fut)
}
}
// If http2 is not enable, we just have a stub here, so that the trait bounds
// that *would* have been needed are still checked. Why?
//
// Because enabling `http2` shouldn't suddenly add new trait bounds that cause
// a compilation error.
#[cfg(not(feature = "http2"))]
#[allow(missing_debug_implementations)]
pub struct H2Stream<F, B>(std::marker::PhantomData<(F, B)>);
#[cfg(not(feature = "http2"))]
impl<F, B, E> Future for H2Stream<F, B>
where
F: Future<Output = Result<http::Response<B>, E>>,
B: crate::body::HttpBody,
B::Error: Into<Box<dyn std::error::Error + Send + Sync>>,
E: Into<Box<dyn std::error::Error + Send + Sync>>,
{
type Output = ();
fn poll(
self: Pin<&mut Self>,
_cx: &mut std::task::Context<'_>,
) -> std::task::Poll<Self::Output> {
unreachable!()
}
}