mirror of
https://github.com/hexedtech/codemp.git
synced 2024-10-23 02:09:20 +02:00
97 lines
2.5 KiB
Rust
97 lines
2.5 KiB
Rust
use crate::{Error, api::Controller};
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use tokio::sync::mpsc;
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/// invoke .poll() on all given buffer controllers and wait, returning the first one ready
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///
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/// this will spawn tasks blocked on .poll() for each buffer controller. as soon as
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/// one finishes, all other tasks will be canceled and the ready controller will be
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/// returned
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///
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/// if timeout is None, result will never be None, otherwise returns None if no buffer
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/// is ready before timeout expires
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///
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/// returns an error if all buffers returned errors while polling.
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pub async fn select_buffer(
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buffers: &[crate::buffer::Controller],
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timeout: Option<std::time::Duration>,
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runtime: &tokio::runtime::Runtime
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) -> crate::Result<Option<crate::buffer::Controller>> {
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let (tx, mut rx) = mpsc::unbounded_channel();
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let mut tasks = Vec::new();
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for buffer in buffers {
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let _tx = tx.clone();
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let _buffer = buffer.clone();
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tasks.push(runtime.spawn(async move {
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match _buffer.poll().await {
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Ok(()) => _tx.send(Ok(Some(_buffer))),
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Err(_) => _tx.send(Err(Error::Channel { send: true })),
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}
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}))
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}
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if let Some(d) = timeout {
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let _tx = tx.clone();
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tasks.push(runtime.spawn(async move {
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tokio::time::sleep(d).await;
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_tx.send(Ok(None))
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}));
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}
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loop {
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match rx.recv().await {
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None => return Err(Error::Channel { send: false }),
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Some(Err(_)) => continue, // TODO log errors maybe?
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Some(Ok(x)) => {
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for t in tasks {
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t.abort();
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}
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return Ok(x.clone());
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},
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}
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}
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}
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pub fn hash(data: impl AsRef<[u8]>) -> i64 {
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let hash = xxhash_rust::xxh3::xxh3_64(data.as_ref());
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i64::from_ne_bytes(hash.to_ne_bytes())
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}
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/// wraps sender and receiver to allow mutable field with immutable ref
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#[derive(Debug)]
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pub struct InternallyMutable<T> {
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getter: tokio::sync::watch::Receiver<T>,
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setter: tokio::sync::watch::Sender<T>,
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}
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impl<T: Default> Default for InternallyMutable<T> {
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fn default() -> Self {
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Self::new(T::default())
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}
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}
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impl<T> InternallyMutable<T> {
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pub fn new(init: T) -> Self {
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let (tx, rx) = tokio::sync::watch::channel(init);
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InternallyMutable {
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getter: rx,
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setter: tx,
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}
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}
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pub fn set(&self, state: T) -> T {
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self.setter.send_replace(state)
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}
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}
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impl<T: Clone> InternallyMutable<T> {
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pub fn get(&self) -> T {
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self.getter.borrow().clone()
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}
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}
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/*
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pub(crate) struct CallbackHandleWatch<T>(pub(crate) tokio::sync::watch::Sender<Option<T>>);
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impl<T> crate::api::controller::CallbackHandle for CallbackHandleWatch<T> {
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fn unregister(self) {
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self.0.send_replace(None);
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}
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}*/
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