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#![doc(html_favicon_url = "https://qaul.org/favicon.ico")]
#![doc(html_logo_url = "https://qaul.org/img/qaul_icon-128.png")]
use async_std::{
sync::{Arc, RwLock},
task,
};
use async_trait::async_trait;
use ratman_netmod::{Endpoint, Error as NetError, Frame, Result as NetResult, Target};
pub(crate) mod io;
pub struct MemMod {
io: Arc<RwLock<Option<io::Io>>>,
}
impl MemMod {
pub fn new() -> Arc<Self> {
Arc::new(Self {
io: Default::default(),
})
}
pub fn make_pair() -> (Arc<Self>, Arc<Self>) {
let (a, b) = (MemMod::new(), MemMod::new());
a.link(&b);
(a, b)
}
pub fn linked(&self) -> bool {
task::block_on(async { self.io.read().await.is_some() })
}
pub fn link(&self, pair: &MemMod) {
if self.linked() || pair.linked() {
panic!("Attempted to link an already linked MemMod.");
}
let (my_io, their_io) = io::Io::make_pair();
self.set_io_async(my_io);
pair.set_io_async(their_io);
}
pub(crate) fn link_raw(&mut self, io: io::Io) {
if self.linked() {
panic!("Attempted to link an already linked MemMod.");
}
self.set_io_async(io);
}
pub fn split(&self) {
self.set_io_async(None);
}
fn set_io_async<I: Into<Option<io::Io>>>(&self, val: I) {
task::block_on(async { *self.io.write().await = val.into() });
}
}
#[async_trait]
impl Endpoint for MemMod {
fn size_hint(&self) -> usize {
::std::u32::MAX as usize
}
async fn send(&self, frame: Frame, _: Target) -> NetResult<()> {
let io = self.io.read().await;
match *io {
None => Err(NetError::NotSupported),
Some(ref io) => Ok(io.out.send(frame).await.unwrap()),
}
}
async fn next(&self) -> NetResult<(Frame, Target)> {
let io = self.io.read().await;
match *io {
None => Err(NetError::NotSupported),
Some(ref io) => match io.inc.recv().await {
Ok(f) => Ok((f, Target::default())),
Err(_) => Err(NetError::ConnectionLost),
},
}
}
}