#
actix_server/
service.rs

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    use std::{
        marker::PhantomData,
        net::SocketAddr,
        task::{Context, Poll},
    };

    use actix_service::{Service, ServiceFactory as BaseServiceFactory};
    use actix_utils::future::{ready, Ready};
    use futures_core::future::LocalBoxFuture;
    use tracing::error;

    use crate::{
        socket::{FromStream, MioStream},
        worker::WorkerCounterGuard,
    };

    #[doc(hidden)]
    pub trait ServerServiceFactory<Stream: FromStream>: Send + Clone + 'static {
        type Factory: BaseServiceFactory<Stream, Config = ()>;

        fn create(&self) -> Self::Factory;
    }

    pub(crate) trait InternalServiceFactory: Send {
        fn name(&self, token: usize) -> &str;

        fn clone_factory(&self) -> Box<dyn InternalServiceFactory>;

        fn create(&self) -> LocalBoxFuture<'static, Result<(usize, BoxedServerService), ()>>;
    }

    pub(crate) type BoxedServerService = Box<
        dyn Service<
            (WorkerCounterGuard, MioStream),
            Response = (),
            Error = (),
            Future = Ready<Result<(), ()>>,
        >,
    >;

    pub(crate) struct StreamService<S, I> {
        service: S,
        _phantom: PhantomData<I>,
    }

    impl<S, I> StreamService<S, I> {
        pub(crate) fn new(service: S) -> Self {
            StreamService {
                service,
                _phantom: PhantomData,
            }
        }
    }

    impl<S, I> Service<(WorkerCounterGuard, MioStream)> for StreamService<S, I>
    where
        S: Service<I>,
        S::Future: 'static,
        S::Error: 'static,
        I: FromStream,
    {
        type Response = ();
        type Error = ();
        type Future = Ready<Result<(), ()>>;

        fn poll_ready(&self, ctx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
            self.service.poll_ready(ctx).map_err(|_| ())
        }

        fn call(&self, (guard, req): (WorkerCounterGuard, MioStream)) -> Self::Future {
            ready(match FromStream::from_mio(req) {
                Ok(stream) => {
                    let f = self.service.call(stream);
                    actix_rt::spawn(async move {
                        let _ = f.await;
                        drop(guard);
                    });
                    Ok(())
                }
                Err(err) => {
                    error!("can not convert to an async TCP stream: {err}");
                    Err(())
                }
            })
        }
    }

    pub(crate) struct StreamNewService<F: ServerServiceFactory<Io>, Io: FromStream> {
        name: String,
        inner: F,
        token: usize,
        addr: SocketAddr,
        _t: PhantomData<Io>,
    }

    impl<F, Io> StreamNewService<F, Io>
    where
        F: ServerServiceFactory<Io>,
        Io: FromStream + Send + 'static,
    {
        pub(crate) fn create(
            name: String,
            token: usize,
            inner: F,
            addr: SocketAddr,
        ) -> Box<dyn InternalServiceFactory> {
            Box::new(Self {
                name,
                token,
                inner,
                addr,
                _t: PhantomData,
            })
        }
    }

    impl<F, Io> InternalServiceFactory for StreamNewService<F, Io>
    where
        F: ServerServiceFactory<Io>,
        Io: FromStream + Send + 'static,
    {
        fn name(&self, _: usize) -> &str {
            &self.name
        }

        fn clone_factory(&self) -> Box<dyn InternalServiceFactory> {
            Box::new(Self {
                name: self.name.clone(),
                inner: self.inner.clone(),
                token: self.token,
                addr: self.addr,
                _t: PhantomData,
            })
        }

        fn create(&self) -> LocalBoxFuture<'static, Result<(usize, BoxedServerService), ()>> {
            let token = self.token;
            let fut = self.inner.create().new_service(());
            Box::pin(async move {
                match fut.await {
                    Ok(inner) => {
                        let service = Box::new(StreamService::new(inner)) as _;
                        Ok((token, service))
                    }
                    Err(_) => Err(()),
                }
            })
        }
    }

    impl<F, T, I> ServerServiceFactory<I> for F
    where
        F: Fn() -> T + Send + Clone + 'static,
        T: BaseServiceFactory<I, Config = ()>,
        I: FromStream,
    {
        type Factory = T;

        fn create(&self) -> T {
            (self)()
        }
    }