From 30be9d3e314523d0a599dc88048e6a62a57fd610 Mon Sep 17 00:00:00 2001
From: Minghao Li <castermode@gmail.com>
Date: Wed, 9 Mar 2022 20:04:39 +0800
Subject: [PATCH] sync refactor

---
 source/libs/sync/inc/syncRaftLog.h |  4 +-
 source/libs/sync/src/syncRaftLog.c | 65 ++++++++++++++++++++++++++----
 2 files changed, 61 insertions(+), 8 deletions(-)

diff --git a/source/libs/sync/inc/syncRaftLog.h b/source/libs/sync/inc/syncRaftLog.h
index 634d06903c..ecdb544302 100644
--- a/source/libs/sync/inc/syncRaftLog.h
+++ b/source/libs/sync/inc/syncRaftLog.h
@@ -40,7 +40,7 @@ void logStoreDestory(SSyncLogStore* pLogStore);
 int32_t logStoreAppendEntry(SSyncLogStore* pLogStore, SSyncRaftEntry* pEntry);
 
 // get one log entry, user need to free pEntry->pCont
-int32_t logStoreGetEntry(SSyncLogStore* pLogStore, SyncIndex index, SSyncRaftEntry* pEntry);
+SSyncRaftEntry* logStoreGetEntry(SSyncLogStore* pLogStore, SyncIndex index);
 
 // truncate log with index, entries after the given index (>=index) will be deleted
 int32_t logStoreTruncate(SSyncLogStore* pLogStore, SyncIndex fromIndex);
@@ -57,6 +57,8 @@ int32_t logStoreUpdateCommitIndex(SSyncLogStore* pLogStore, SyncIndex index);
 // return commit index of log
 SyncIndex logStoreGetCommitIndex(SSyncLogStore* pLogStore);
 
+SSyncRaftEntry* logStoreGetLastEntry(SSyncLogStore* pLogStore);
+
 cJSON* logStore2Json(SSyncLogStore* pLogStore);
 
 char* logStore2Str(SSyncLogStore* pLogStore);
diff --git a/source/libs/sync/src/syncRaftLog.c b/source/libs/sync/src/syncRaftLog.c
index c4e1feb374..d5735d9142 100644
--- a/source/libs/sync/src/syncRaftLog.c
+++ b/source/libs/sync/src/syncRaftLog.c
@@ -44,25 +44,76 @@ void logStoreDestory(SSyncLogStore* pLogStore) {
 }
 
 // append one log entry
-int32_t logStoreAppendEntry(SSyncLogStore* pLogStore, SSyncRaftEntry* pEntry) {}
+int32_t logStoreAppendEntry(SSyncLogStore* pLogStore, SSyncRaftEntry* pEntry) {
+  SSyncLogStoreData* pData = pLogStore->data;
+  SWal*              pWal = pData->pWal;
+  char*              buf = malloc(pEntry->bytes);
+
+  syncEntrySerialize(pEntry, buf, pEntry->bytes);
+  walWrite(pWal, pEntry->index, pEntry->msgType, buf, pEntry->bytes);
+  walFsync(pWal, true);
+
+  free(buf);
+}
 
 // get one log entry, user need to free pEntry->pCont
-int32_t logStoreGetEntry(SSyncLogStore* pLogStore, SyncIndex index, SSyncRaftEntry* pEntry) {}
+SSyncRaftEntry* logStoreGetEntry(SSyncLogStore* pLogStore, SyncIndex index) {
+  SSyncLogStoreData* pData = pLogStore->data;
+  SWal*              pWal = pData->pWal;
+  SSyncRaftEntry*    pEntry;
+
+  SWalReadHandle* pWalHandle = walOpenReadHandle(pWal);
+  walReadWithHandle(pWalHandle, index);
+
+  // need to hold, do not new every time!!
+  walCloseReadHandle(pWalHandle);
+  return pEntry;
+}
 
 // truncate log with index, entries after the given index (>=index) will be deleted
-int32_t logStoreTruncate(SSyncLogStore* pLogStore, SyncIndex fromIndex) {}
+int32_t logStoreTruncate(SSyncLogStore* pLogStore, SyncIndex fromIndex) {
+  SSyncLogStoreData* pData = pLogStore->data;
+  SWal*              pWal = pData->pWal;
+  walRollback(pWal, fromIndex);
+}
 
 // return index of last entry
-SyncIndex logStoreLastIndex(SSyncLogStore* pLogStore) {}
+SyncIndex logStoreLastIndex(SSyncLogStore* pLogStore) {
+  SSyncRaftEntry* pLastEntry = logStoreGetLastEntry(pLogStore);
+  SyncIndex       lastIndex = pLastEntry->index;
+  free(pLastEntry);
+  return lastIndex;
+}
 
 // return term of last entry
-SyncTerm logStoreLastTerm(SSyncLogStore* pLogStore) {}
+SyncTerm logStoreLastTerm(SSyncLogStore* pLogStore) {
+  SSyncRaftEntry* pLastEntry = logStoreGetLastEntry(pLogStore);
+  SyncTerm        lastTerm = pLastEntry->term;
+  free(pLastEntry);
+  return lastTerm;
+}
 
 // update log store commit index with "index"
-int32_t logStoreUpdateCommitIndex(SSyncLogStore* pLogStore, SyncIndex index) {}
+int32_t logStoreUpdateCommitIndex(SSyncLogStore* pLogStore, SyncIndex index) {
+  SSyncLogStoreData* pData = pLogStore->data;
+  SWal*              pWal = pData->pWal;
+  walCommit(pWal, index);
+}
 
 // return commit index of log
-SyncIndex logStoreGetCommitIndex(SSyncLogStore* pLogStore) {}
+SyncIndex logStoreGetCommitIndex(SSyncLogStore* pLogStore) {
+  SSyncLogStoreData* pData = pLogStore->data;
+  return pData->pSyncNode->commitIndex;
+}
+
+SSyncRaftEntry* logStoreGetLastEntry(SSyncLogStore* pLogStore) {
+  SSyncLogStoreData* pData = pLogStore->data;
+  SWal*              pWal = pData->pWal;
+  SyncIndex          lastIndex = walGetLastVer(pWal);
+  SSyncRaftEntry*    pEntry;
+  pEntry = logStoreGetEntry(pLogStore, lastIndex);
+  return pEntry;
+}
 
 cJSON* logStore2Json(SSyncLogStore* pLogStore) {}