refactor(sync): add syncGetSnapshotByIndex

include/libs/sync/sync.h

@@ -215,6 +215,7 @@ int32_t     syncProposeBatch(int64_t rid, SRpcMsg* pMsgArr, bool* pIsWeakArr, in
 bool        syncEnvIsStart();
 const char* syncStr(ESyncState state);
 bool        syncIsRestoreFinish(int64_t rid);
+int32_t     syncGetSnapshotByIndex(int64_t rid, SyncIndex index, SSnapshot* pSnapshot);
 
 int32_t syncReconfig(int64_t rid, const SSyncCfg* pNewCfg);
 

source/libs/sync/src/syncMain.c

@@ -397,6 +397,38 @@ bool syncIsRestoreFinish(int64_t rid) {
   return b;
 }
 
+int32_t syncGetSnapshotByIndex(int64_t rid, SyncIndex index, SSnapshot* pSnapshot) {
+  if (index < SYNC_INDEX_BEGIN) {
+    return -1;
+  }
+
+  SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
+  if (pSyncNode == NULL) {
+    return -1;
+  }
+  ASSERT(rid == pSyncNode->rid);
+
+  SSyncRaftEntry* pEntry = NULL;
+  int32_t         code = pSyncNode->pLogStore->syncLogGetEntry(pSyncNode->pLogStore, index, &pEntry);
+  if (code != 0) {
+    if (pEntry != NULL) {
+      syncEntryDestory(pEntry);
+    }
+    taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+    return -1;
+  }
+  ASSERT(pEntry != NULL);
+
+  pSnapshot->data = NULL;
+  pSnapshot->lastApplyIndex = index;
+  pSnapshot->lastApplyTerm = pEntry->term;
+  pSnapshot->lastConfigIndex = syncNodeGetSnapshotConfigIndex(pSyncNode, index);
+
+  syncEntryDestory(pEntry);
+  taosReleaseRef(tsNodeRefId, pSyncNode->rid);
+  return 0;
+}
+
 int32_t syncGetSnapshotMeta(int64_t rid, struct SSnapshotMeta* sMeta) {
   SSyncNode* pSyncNode = (SSyncNode*)taosAcquireRef(tsNodeRefId, rid);
   if (pSyncNode == NULL) {

source/libs/sync/test/syncIndexTest.cpp

@@ -8,7 +8,6 @@ void print(SHashObj *pNextIndex) {
   printf("----------------\n");
   uint64_t *p = (uint64_t *)taosHashIterate(pNextIndex, NULL);
   while (p) {
-
     size_t len;
     void * key = taosHashGetKey(p, &len);