fix: waku_peer_count conversion to usize (#76)

waku-bindings/src/node/management.rs

@@ -62,6 +62,7 @@ pub fn waku_listen_addresses() -> Result<Vec<Multiaddr>> {
 mod test {
     use super::waku_new;
     use crate::node::management::{waku_listen_addresses, waku_peer_id, waku_start, waku_stop};
+    use crate::node::peers::waku_peer_count;
     use serial_test::serial;
 
     #[test]
@@ -74,6 +75,9 @@ mod test {
         dbg!(&id);
         assert!(!id.is_empty());
 
+        let peer_cnt = waku_peer_count().unwrap();
+        dbg!(peer_cnt);
+
         // test addresses, since we cannot start different instances of the node
         let addresses = waku_listen_addresses().unwrap();
         dbg!(&addresses);

waku-bindings/src/node/peers.rs

@@ -98,7 +98,11 @@ pub fn waku_disconnect_peer_with_id(peer_id: &PeerId) -> Result<()> {
 /// As per the [specification](https://rfc.vac.dev/spec/36/#extern-char-waku_peer_count)
 pub fn waku_peer_count() -> Result<usize> {
     let response_ptr = unsafe { waku_sys::waku_peer_cnt() };
-    decode_and_free_response(response_ptr)
+    let num_str = decode_and_free_response::<String>(response_ptr)?;
+    let num = num_str
+        .parse::<u32>()
+        .map_err(|_| "could not convert peer count into u32".to_string())?;
+    usize::try_from(num).map_err(|_| "could not convert peer count into usize".to_string())
 }
 
 /// Waku peer supported protocol