first commit

1 files changed, 52 insertions, 0 deletions

diff --git a/karyons_core/src/async_utils/timeout.rs b/karyons_core/src/async_utils/timeout.rs
new file mode 100644
index 0000000..7c55e1b
--- /dev/null
+++ b/karyons_core/src/async_utils/timeout.rs
@@ -0,0 +1,52 @@
+use std::{future::Future, time::Duration};
+
+use smol::Timer;
+
+use super::{select, Either};
+use crate::{error::Error, Result};
+
+/// Waits for a future to complete or times out if it exceeds a specified
+/// duration.
+///
+/// # Example
+///
+/// ```
+/// use std::{future, time::Duration};
+///
+/// use karyons_core::async_utils::timeout;
+///
+/// async {
+///     let fut = future::pending::<()>();
+///     assert!(timeout(Duration::from_millis(100), fut).await.is_err());
+/// };
+///
+/// ```
+///
+pub async fn timeout<T, F>(delay: Duration, future1: F) -> Result<T>
+where
+    F: Future<Output = T>,
+{
+    let result = select(Timer::after(delay), future1).await;
+
+    match result {
+        Either::Left(_) => Err(Error::Timeout),
+        Either::Right(res) => Ok(res),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::{future, time::Duration};
+
+    #[test]
+    fn test_timeout() {
+        smol::block_on(async move {
+            let fut = future::pending::<()>();
+            assert!(timeout(Duration::from_millis(10), fut).await.is_err());
+
+            let fut = smol::Timer::after(Duration::from_millis(10));
+            assert!(timeout(Duration::from_millis(50), fut).await.is_ok())
+        });
+    }
+}