sync refactor

include/libs/sync/sync.h

@@ -88,16 +88,19 @@ typedef struct SSyncFSM {
 
 } SSyncFSM;
 
+struct SSyncRaftEntry;
+typedef struct SSyncRaftEntry SSyncRaftEntry;
+
 // abstract definition of log store in raft
 // SWal implements it
 typedef struct SSyncLogStore {
   void* data;
 
   // append one log entry
-  int32_t (*appendEntry)(struct SSyncLogStore* pLogStore, SRpcMsg* pEntry);
+  int32_t (*appendEntry)(struct SSyncLogStore* pLogStore, SSyncRaftEntry* pEntry);
 
   // get one log entry, user need to free pEntry->pCont
-  int32_t (*getEntry)(struct SSyncLogStore* pLogStore, SyncIndex index, SRpcMsg* pEntry);
+  SSyncRaftEntry* (*getEntry)(struct SSyncLogStore* pLogStore, SyncIndex index);
 
   // truncate log with index, entries after the given index (>=index) will be deleted
   int32_t (*truncate)(struct SSyncLogStore* pLogStore, SyncIndex fromIndex);