Minor fixes: space, deserialization requirement, &Arc<>.

1. Extra line between functions.
2. request_vote does not require Command to be deserializable.
3. &Arc<T> can usually be replaced with &T.

src/lib.rs

@@ -577,7 +577,7 @@ where
     }
 
     fn build_heartbeat(
-        rf: &Arc<Mutex<RaftState<Command>>>,
+        rf: &Mutex<RaftState<Command>>,
     ) -> Option<AppendEntriesArgs<Command>> {
         let rf = rf.lock();
 
@@ -748,7 +748,7 @@ where
     }
 
     fn build_append_entries(
-        rf: &Arc<Mutex<RaftState<Command>>>,
+        rf: &Mutex<RaftState<Command>>,
         peer_index: usize,
     ) -> Option<AppendEntriesArgs<Command>> {
         let rf = rf.lock();

src/rpcs.rs

@@ -10,7 +10,7 @@ use crate::{
 use serde::de::DeserializeOwned;
 use serde::Serialize;
 
-fn proxy_request_vote<Command: Clone + Serialize + DeserializeOwned>(
+fn proxy_request_vote<Command: Clone + Serialize>(
     raft: &Raft<Command>,
     data: RequestMessage,
 ) -> ReplyMessage {
@@ -24,6 +24,7 @@ fn proxy_request_vote<Command: Clone + Serialize + DeserializeOwned>(
             .expect("Serialization of reply should not fail"),
     )
 }
+
 fn proxy_append_entries<Command: Clone + Serialize + DeserializeOwned>(
     raft: &Raft<Command>,
     data: RequestMessage,