Change: move runtime config API to dedicated RuntimeConfigHandle

openraft/src/raft/mod.rs

@@ -2,13 +2,13 @@
 
 mod message;
 mod raft_inner;
+mod runtime_config_handle;
 mod trigger;
 
 pub(in crate::raft) mod core_state;
 
 use std::fmt::Debug;
 use std::marker::PhantomData;
-use std::sync::atomic::Ordering;
 use std::sync::Arc;
 use std::time::Duration;
 
@@ -50,6 +50,7 @@ use crate::metrics::RaftMetrics;
 use crate::metrics::Wait;
 use crate::network::RaftNetworkFactory;
 use crate::raft::raft_inner::RaftInner;
+use crate::raft::runtime_config_handle::RuntimeConfigHandle;
 use crate::raft::trigger::Trigger;
 use crate::storage::RaftLogStorage;
 use crate::storage::RaftStateMachine;
@@ -261,21 +262,33 @@ where
         })
     }
 
-    /// Enable or disable raft internal ticker.
+    /// Return a handle to update runtime config.
+    ///
+    /// Such enabling/disabling heartbeat, election, etc.
     ///
-    /// The internal ticker triggers all timeout based event, e.g. election event or heartbeat
-    /// event. By disabling the ticker, a follower will not enter candidate again, a leader will
-    /// not send heartbeat.
+    /// Example:
+    /// ```ignore
+    /// let raft = Raft::new(...).await?;
+    /// raft.runtime_config().heartbeat(true);
+    /// ```
+    pub fn runtime_config(&self) -> RuntimeConfigHandle<C, N, LS> {
+        RuntimeConfigHandle::new(self.inner.as_ref())
+    }
+
+    /// Enable or disable raft internal ticker.
+    #[deprecated(note = "use `Raft::runtime_config().tick()` instead")]
     pub fn enable_tick(&self, enabled: bool) {
-        self.inner.tick_handle.enable(enabled);
+        self.runtime_config().tick(enabled)
     }
 
+    #[deprecated(note = "use `Raft::runtime_config().heartbeat()` instead")]
     pub fn enable_heartbeat(&self, enabled: bool) {
-        self.inner.runtime_config.enable_heartbeat.store(enabled, Ordering::Relaxed);
+        self.runtime_config().heartbeat(enabled)
     }
 
+    #[deprecated(note = "use `Raft::runtime_config().elect()` instead")]
     pub fn enable_elect(&self, enabled: bool) {
-        self.inner.runtime_config.enable_elect.store(enabled, Ordering::Relaxed);
+        self.runtime_config().elect(enabled)
     }
 
     /// Return a handle to manually trigger raft actions, such as elect or build snapshot.

openraft/src/raft/runtime_config_handle.rs

@@ -0,0 +1,53 @@
+//! RuntimeConfigHandle is an interface to change Raft runtime config.
+
+use std::sync::atomic::Ordering;
+
+use crate::raft::RaftInner;
+use crate::storage::RaftLogStorage;
+use crate::RaftNetworkFactory;
+use crate::RaftTypeConfig;
+
+/// RuntimeConfigHandle is an interface to update runtime config.
+///
+/// These config are mainly designed for testing purpose and special use cases.
+/// Usually you don't need to change runtime config.
+pub struct RuntimeConfigHandle<'r, C, N, LS>
+where
+    C: RaftTypeConfig,
+    N: RaftNetworkFactory<C>,
+    LS: RaftLogStorage<C>,
+{
+    raft_inner: &'r RaftInner<C, N, LS>,
+}
+
+impl<'r, C, N, LS> RuntimeConfigHandle<'r, C, N, LS>
+where
+    C: RaftTypeConfig,
+    N: RaftNetworkFactory<C>,
+    LS: RaftLogStorage<C>,
+{
+    pub(in crate::raft) fn new(raft_inner: &'r RaftInner<C, N, LS>) -> Self {
+        Self { raft_inner }
+    }
+
+    /// Enable or disable raft internal ticker.
+    ///
+    /// Disabling tick will disable election and heartbeat.
+    pub fn tick(&self, enabled: bool) {
+        self.raft_inner.tick_handle.enable(enabled);
+    }
+
+    /// Enable or disable heartbeat message when a leader has no more log to replicate.
+    ///
+    /// Note that the follower's leader-lease will not be renewed if it does receive message from
+    /// the leader, and it will start election(if `Self::elect()` is enabled) when the lease timed
+    /// out.
+    pub fn heartbeat(&self, enabled: bool) {
+        self.raft_inner.runtime_config.enable_heartbeat.store(enabled, Ordering::Relaxed);
+    }
+
+    /// Enable or disable election for a follower when its leader lease timed out.
+    pub fn elect(&self, enabled: bool) {
+        self.raft_inner.runtime_config.enable_elect.store(enabled, Ordering::Relaxed);
+    }
+}

tests/tests/append_entries/t60_enable_heartbeat.rs

@@ -27,7 +27,7 @@ async fn enable_heartbeat() -> Result<()> {
     let _ = log_index;
 
     let node0 = router.get_raft_handle(&0)?;
-    node0.enable_heartbeat(true);
+    node0.runtime_config().heartbeat(true);
 
     for _i in 0..3 {
         let now = <TokioRuntime as AsyncRuntime>::Instant::now();

tests/tests/append_entries/t61_heartbeat_reject_vote.rs

@@ -74,7 +74,7 @@ async fn heartbeat_reject_vote() -> Result<()> {
 
     tracing::info!(log_index, "--- disable heartbeat, vote request will be granted");
     {
-        node0.enable_heartbeat(false);
+        node0.runtime_config().heartbeat(false);
         sleep(Duration::from_millis(1500)).await;
 
         router.wait(&1, timeout()).log(Some(log_index), "no log is written").await?;

tests/tests/membership/t21_change_membership_cases.rs

@@ -148,7 +148,7 @@ async fn change_from_to(old: BTreeSet<MemNodeId>, change_members: BTreeSet<MemNo
         tracing::info!(log_index, "--- let a node in the new cluster elect");
         {
             let n = router.get_raft_handle(new.iter().next().unwrap())?;
-            n.enable_elect(true);
+            n.runtime_config().elect(true);
         }
 
         tracing::info!(log_index, "--- wait for old leader or new leader");
@@ -354,7 +354,7 @@ async fn change_by_remove(old: BTreeSet<MemNodeId>, remove: &[MemNodeId]) -> any
         tracing::info!(log_index, "--- let a node in the new cluster elect");
         {
             let n = router.get_raft_handle(new.iter().next().unwrap())?;
-            n.enable_elect(true);
+            n.runtime_config().elect(true);
         }
 
         tracing::info!(log_index, "--- wait for old leader or new leader");

tests/tests/membership/t31_remove_leader.rs

@@ -176,7 +176,7 @@ async fn remove_leader_access_new_cluster() -> Result<()> {
     tracing::info!(log_index, "--- elect node-2, handle write");
     {
         let n2 = router.get_raft_handle(&2)?;
-        n2.enable_elect(true);
+        n2.runtime_config().elect(true);
         n2.wait(timeout()).state(ServerState::Leader, "node-2 elect itself").await?;
         log_index += 1;