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try receive data first when TryAsyncStream's poll_next. #2846

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try receive data first when TryAsyncStream's poll_next. #2846

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8 changes: 7 additions & 1 deletion sqlx-core/src/ext/async_stream.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -21,7 +21,7 @@ impl<'a, T> TryAsyncStream<'a, T> {
Fut: 'a + Future<Output = Result<(), Error>> + Send,
T: 'a + Send,
{
let (mut sender, receiver) = mpsc::channel(0);
let (mut sender, receiver) = mpsc::channel(10);

let future = f(sender.clone());
let future = async move {
Expand All @@ -42,6 +42,12 @@ impl<'a, T> Stream for TryAsyncStream<'a, T> {
type Item = Result<T, Error>;

fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
// fast path
let t = self.receiver.try_next();
match t {
Ok(x) => return Poll::Ready(x),
Err(_) => {}
}
let future = &mut self.future;
pin_mut!(future);

Expand Down