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37 lines
1.2 KiB
Rust
37 lines
1.2 KiB
Rust
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use crate::{Error, api::Controller};
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/// invoke .poll() on all buffer controllers and wait, return name of first one ready
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///
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/// this will spawn tasks for each buffer controller, each blocked in a poll() call. as soon as
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/// one finishes, all other tasks will be canceled and the name of ready controller will be
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/// returned. just do client.get_buffer(name).try_recv()
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///
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/// this is not super efficient as of now but has room for improvement. using this API may
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/// provide significant improvements on editor-side
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pub async fn select_buffer(buffers: &[std::sync::Arc<crate::buffer::Controller>]) -> crate::Result<String> {
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let (tx, mut rx) = tokio::sync::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(tokio::spawn(async move {
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match _buffer.poll().await {
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Ok(()) => _tx.send(Ok(_buffer.name.clone())),
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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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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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