refactor: change u64 to Duration (#636)

* refactor: change poll_interval and all dependent lines of code.

* fix: broken test

crates/provider/src/heart.rs

@@ -185,8 +185,7 @@ impl<'a, T: Transport + Clone, N: Network> PendingTransactionBuilder<'a, T, N> {
 
         // FIXME: this is a hotfix to prevent a race condition where the heartbeat would miss the
         // block the tx was mined in
-        let mut interval =
-            tokio::time::interval(Duration::from_millis(self.provider.client().poll_interval()));
+        let mut interval = tokio::time::interval(self.provider.client().poll_interval());
 
         loop {
             let mut confirmed = false;

crates/rpc-client/src/client.rs

@@ -9,6 +9,7 @@ use std::{
         atomic::{AtomicU64, Ordering},
         Arc, Weak,
     },
+    time::Duration,
 };
 use tower::{layer::util::Identity, ServiceBuilder};
 
@@ -180,8 +181,8 @@ impl<T> RpcClientInner<T> {
     }
 
     /// Returns the default poll interval (milliseconds) for the client.
-    pub fn poll_interval(&self) -> u64 {
-        self.poll_interval.load(Ordering::Relaxed)
+    pub fn poll_interval(&self) -> Duration {
+        Duration::from_millis(self.poll_interval.load(Ordering::Relaxed))
     }
 
     /// Set the poll interval for the client in milliseconds.
@@ -346,6 +347,6 @@ mod tests {
         let client = RpcClient::new_http(reqwest::Url::parse("http://localhost").unwrap())
             .with_poll_interval(5000);
         // let client = client;
-        assert_eq!(client.poll_interval(), 5000);
+        assert_eq!(client.poll_interval(), Duration::from_millis(5000));
     }
 }

crates/rpc-client/src/poller.rs

@@ -85,9 +85,8 @@ where
         method: impl Into<Cow<'static, str>>,
         params: Params,
     ) -> Self {
-        let poll_interval = client
-            .upgrade()
-            .map_or_else(|| Duration::from_secs(7), |c| Duration::from_millis(c.poll_interval()));
+        let poll_interval =
+            client.upgrade().map_or_else(|| Duration::from_secs(7), |c| c.poll_interval());
         Self {
             client,
             method: method.into(),