enh(sync): add FpSnapshotRead FpSnapshotApply

include/libs/sync/sync.h

@@ -90,6 +90,10 @@ typedef struct SSyncFSM {
   void (*FpRestoreFinish)(struct SSyncFSM* pFsm);
   int32_t (*FpGetSnapshot)(struct SSyncFSM* pFsm, SSnapshot* pSnapshot);
   int32_t (*FpRestoreSnapshot)(struct SSyncFSM* pFsm, const SSnapshot* snapshot);
+
+  void* (*FpSnapshotRead)(struct SSyncFSM* pFsm, const SSnapshot* snapshot, void* iter, char** ppBuf, int32_t* len);
+  int32_t (*FpSnapshotApply)(struct SSyncFSM* pFsm, const SSnapshot* snapshot, char* pBuf, int32_t len);
+
 } SSyncFSM;
 
 // abstract definition of log store in raft

source/libs/sync/inc/syncInt.h

@@ -148,8 +148,8 @@ typedef struct SSyncNode {
   SSyncRespMgr* pSyncRespMgr;
 
   // restore state
-  bool       restoreFinish;
-  //sem_t      restoreSem;
+  bool restoreFinish;
+  // sem_t      restoreSem;
   SSnapshot* pSnapshot;
 
 } SSyncNode;

source/libs/sync/src/syncMain.c

@@ -513,7 +513,7 @@ SSyncNode* syncNodeOpen(const SSyncInfo* pSyncInfo) {
     pSyncNode->pSnapshot = taosMemoryMalloc(sizeof(SSnapshot));
     pSyncNode->pFsm->FpGetSnapshot(pSyncNode->pFsm, pSyncNode->pSnapshot);
   }
-  //tsem_init(&(pSyncNode->restoreSem), 0, 0);
+  // tsem_init(&(pSyncNode->restoreSem), 0, 0);
 
   // start in syncNodeStart
   // start raft
@@ -610,7 +610,7 @@ void syncNodeClose(SSyncNode* pSyncNode) {
     taosMemoryFree(pSyncNode->pSnapshot);
   }
 
-  //tsem_destroy(&pSyncNode->restoreSem);
+  // tsem_destroy(&pSyncNode->restoreSem);
 
   // free memory in syncFreeNode
   // taosMemoryFree(pSyncNode);

source/libs/sync/test/syncConfigChangeTest.cpp

@@ -73,9 +73,7 @@ int32_t GetSnapshotCb(struct SSyncFSM* pFsm, SSnapshot* pSnapshot) {
   return 0;
 }
 
-void FpRestoreFinishCb(struct SSyncFSM* pFsm) {
-  sTrace("==callback== ==FpRestoreFinishCb==");
-}
+void FpRestoreFinishCb(struct SSyncFSM* pFsm) { sTrace("==callback== ==FpRestoreFinishCb=="); }
 
 SSyncFSM* createFsm() {
   SSyncFSM* pFsm = (SSyncFSM*)taosMemoryMalloc(sizeof(SSyncFSM));