moirai-pal 0.7.0

Platform Abstraction Layer for Moirai async I/O operations
Documentation 
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//! Windows socket ownership retained by readiness snapshots.

use std::net::{TcpListener, TcpStream, UdpSocket};
use std::os::windows::io::{AsRawSocket, RawSocket};
use std::sync::{Arc, Weak};

/// Strong socket ownership held for the duration of one `WSAPoll` call.
#[derive(Clone)]
pub(crate) enum SocketLease {
    TcpStream(Arc<TcpStream>),
    TcpListener(Arc<TcpListener>),
    Udp(Arc<UdpSocket>),
}

impl SocketLease {
    pub(crate) fn raw_socket(&self) -> RawSocket {
        match self {
            Self::TcpStream(socket) => socket.as_raw_socket(),
            Self::TcpListener(socket) => socket.as_raw_socket(),
            Self::Udp(socket) => socket.as_raw_socket(),
        }
    }

    pub(crate) fn downgrade(&self) -> WeakSocketOwner {
        match self {
            Self::TcpStream(socket) => WeakSocketOwner::TcpStream(Arc::downgrade(socket)),
            Self::TcpListener(socket) => WeakSocketOwner::TcpListener(Arc::downgrade(socket)),
            Self::Udp(socket) => WeakSocketOwner::Udp(Arc::downgrade(socket)),
        }
    }
}

/// Non-owning socket identity kept in the platform registration table.
#[derive(Clone)]
pub(crate) enum WeakSocketOwner {
    TcpStream(Weak<TcpStream>),
    TcpListener(Weak<TcpListener>),
    Udp(Weak<UdpSocket>),
}

impl WeakSocketOwner {
    pub(crate) fn upgrade(&self) -> Option<SocketLease> {
        match self {
            Self::TcpStream(socket) => socket.upgrade().map(SocketLease::TcpStream),
            Self::TcpListener(socket) => socket.upgrade().map(SocketLease::TcpListener),
            Self::Udp(socket) => socket.upgrade().map(SocketLease::Udp),
        }
    }
}

macro_rules! impl_socket_lease_from_arc {
    ($($socket:ty => $variant:ident),+ $(,)?) => {
        $(
            impl From<&Arc<$socket>> for SocketLease {
                fn from(socket: &Arc<$socket>) -> Self {
                    Self::$variant(Arc::clone(socket))
                }
            }
        )+
    };
}

impl_socket_lease_from_arc!(
    TcpStream => TcpStream,
    TcpListener => TcpListener,
    UdpSocket => Udp,
);