fix(client): cap pool idle interval to a minimum

Author: seanmonstar

src/client/legacy/pool.rs

@@ -433,6 +433,14 @@ impl<T: Poolable, K: Key> PoolInner<T, K> {
         } else {
             return;
         };
+
+        // While someone might want a shorter duration, and it will be respected
+        // at checkout time, there's no need to wake up and proactively evict
+        // faster than this.
+        const MIN_CHECK: Duration = Duration::from_millis(90);
+
+        let dur = dur.max(MIN_CHECK);
+
         let (tx, rx) = oneshot::channel();
         self.idle_interval_ref = Some(tx);
 
@@ -784,7 +792,7 @@ impl<T: Poolable + 'static, K: Key> IdleTask<T, K> {
                 future::Either::Left(_) => {
                     // pool dropped, bah-bye
                     break;
-                }
+                },
                 future::Either::Right(((), _)) => {
                     if let Some(inner) = self.pool.upgrade() {
                         if let Ok(mut inner) = inner.lock() {