[TD-10645][raft]<feature>refactor sync interface

include/libs/sync/sync.h

@@ -109,33 +109,20 @@ typedef struct SSyncLogStore {
   SyncIndex (*logLastIndex)(struct SSyncLogStore* logStore);
 } SSyncLogStore;
 
-typedef struct SSyncServerState {
-  SyncNodeId voteFor;
-  SyncTerm  term;
-  SyncIndex  commitIndex;
-} SSyncServerState;
-
-typedef struct SSyncClusterConfig {
-  // Log index number of current cluster config.
-  SyncIndex index;
-
-  // Log index number of previous cluster config.
-  SyncIndex prevIndex;
-
-  // current cluster
-  const SSyncCluster* cluster;
-} SSyncClusterConfig;
-
 typedef struct SStateManager {
   void* pData;
 
-  int32_t (*saveServerState)(struct SStateManager* stateMng, SSyncServerState* state);
+  // save serialized server state data, buffer will be free by Sync
+  int32_t (*saveServerState)(struct SStateManager* stateMng, const char* buffer, int n);
 
-  int32_t (*readServerState)(struct SStateManager* stateMng, SSyncServerState* state);
+  // read serialized server state data, buffer will be free by Sync
+  int32_t (*readServerState)(struct SStateManager* stateMng, char** ppBuffer, int* n);
 
-  void (*saveCluster)(struct SStateManager* stateMng, const SSyncClusterConfig* cluster);
+  // save serialized cluster state data, buffer will be free by Sync
+  void (*saveCluster)(struct SStateManager* stateMng, const char* buffer, int n);
 
-  const SSyncClusterConfig* (*readCluster)(struct SStateManager* stateMng);
+  // read serialized cluster state data, buffer will be free by Sync
+  int32_t (*readCluster)(struct SStateManager* stateMng, char** ppBuffer, int* n);
 } SStateManager;
 
 typedef struct {

source/libs/sync/inc/sync_type.h

@@ -50,6 +50,24 @@ typedef struct SSyncRaftEntry SSyncRaftEntry;
 #endif
 #endif
 
+
+typedef struct SSyncServerState {
+  SyncNodeId voteFor;
+  SyncTerm  term;
+  SyncIndex  commitIndex;
+} SSyncServerState;
+
+typedef struct SSyncClusterConfig {
+  // Log index number of current cluster config.
+  SyncIndex index;
+
+  // Log index number of previous cluster config.
+  SyncIndex prevIndex;
+
+  // current cluster
+  const SSyncCluster* cluster;
+} SSyncClusterConfig;
+
 typedef struct {
   int32_t   replica;
   SyncNodeId nodeId[TSDB_MAX_REPLICA];