refactor(sync): set error code in syncIsReady

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

@@ -261,7 +261,8 @@ bool mndIsMaster(SMnode *pMnode) {
   SSyncMgmt *pMgmt = &pMnode->syncMgmt;
 
   if (!syncIsReady(pMgmt->sync)) {
-    terrno = TSDB_CODE_SYN_NOT_LEADER;
+    // get terrno from syncIsReady
+    // terrno = TSDB_CODE_SYN_NOT_LEADER;
     return false;
   }
 

source/libs/sync/src/syncMain.c

@@ -370,6 +370,15 @@ bool syncIsReady(int64_t rid) {
   ASSERT(rid == pSyncNode->rid);
   bool b = (pSyncNode->state == TAOS_SYNC_STATE_LEADER) && pSyncNode->restoreFinish;
   taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+
+  // if false, set error code
+  if (false == b) {
+    if (pSyncNode->state != TAOS_SYNC_STATE_LEADER) {
+      terrno = TSDB_CODE_SYN_NOT_LEADER;
+    } else {
+      terrno = TSDB_CODE_APP_NOT_READY;
+    }
+  }
   return b;
 }