enh(sync): add sync pre stop

include/libs/sync/sync.h

@@ -211,6 +211,7 @@ void    syncCleanUp();
 int64_t syncOpen(SSyncInfo* pSyncInfo);
 void    syncStart(int64_t rid);
 void    syncStop(int64_t rid);
+void    syncPreStop(int64_t rid);
 int32_t syncPropose(int64_t rid, SRpcMsg* pMsg, bool isWeak);
 int32_t syncProcessMsg(int64_t rid, SRpcMsg* pMsg);
 int32_t syncReconfig(int64_t rid, SSyncCfg* pCfg);

source/dnode/mnode/impl/src/mndMain.c

@@ -429,6 +429,7 @@ SMnode *mndOpen(const char *path, const SMnodeOpt *pOption) {
 void mndPreClose(SMnode *pMnode) {
   if (pMnode != NULL) {
     syncLeaderTransfer(pMnode->syncMgmt.sync);
+    syncPreStop(pMnode->syncMgmt.sync);
   }
 }
 

source/dnode/vnode/src/vnd/vnodeOpen.c

@@ -245,6 +245,7 @@ _err:
 void vnodePreClose(SVnode *pVnode) {
   if (pVnode) {
     syncLeaderTransfer(pVnode->sync);
+    syncPreStop(pVnode->sync);
   }
 }
 

source/libs/sync/inc/syncInt.h

@@ -218,6 +218,7 @@ SSyncNode* syncNodeOpen(SSyncInfo* pSyncInfo);
 void       syncNodeStart(SSyncNode* pSyncNode);
 void       syncNodeStartStandBy(SSyncNode* pSyncNode);
 void       syncNodeClose(SSyncNode* pSyncNode);
+void       syncNodePreClose(SSyncNode* pSyncNode);
 int32_t    syncNodePropose(SSyncNode* pSyncNode, SRpcMsg* pMsg, bool isWeak);
 
 // option

source/libs/sync/src/syncMain.c

@@ -81,6 +81,15 @@ void syncStop(int64_t rid) {
   }
 }
 
+void syncPreStop(int64_t rid) {
+  SSyncNode* pSyncNode = syncNodeAcquire(rid);
+  if (pSyncNode == NULL) return;
+
+  syncNodePreClose(pSyncNode);
+
+  syncNodeRelease(pSyncNode);
+}
+
 static bool syncNodeCheckNewConfig(SSyncNode* pSyncNode, const SSyncCfg* pCfg) {
   if (!syncNodeInConfig(pSyncNode, pCfg)) return false;
   return abs(pCfg->replicaNum - pSyncNode->replicaNum) <= 1;
@@ -1222,6 +1231,14 @@ void syncNodeStartStandBy(SSyncNode* pSyncNode) {
   ASSERT(ret == 0);
 }
 
+void syncNodePreClose(SSyncNode* pSyncNode) {
+  // stop elect timer
+  syncNodeStopElectTimer(pSyncNode);
+
+  // stop heartbeat timer
+  syncNodeStopHeartbeatTimer(pSyncNode);
+}
+
 void syncNodeClose(SSyncNode* pSyncNode) {
   if (pSyncNode == NULL) {
     return;