fix: new API tdbAbort for tdb txn aborting

source/dnode/vnode/src/meta/metaCommit.c

@@ -18,6 +18,7 @@
 static FORCE_INLINE void *metaMalloc(void *pPool, size_t size) { return vnodeBufPoolMalloc((SVBufPool *)pPool, size); }
 static FORCE_INLINE void  metaFree(void *pPool, void *p) { vnodeBufPoolFree((SVBufPool *)pPool, p); }
 
+// begin a meta txn
 int metaBegin(SMeta *pMeta) {
   tdbTxnOpen(&pMeta->txn, 0, metaMalloc, metaFree, pMeta->pVnode->inUse, TDB_TXN_WRITE | TDB_TXN_READ_UNCOMMITTED);
 
@@ -28,4 +29,8 @@ int metaBegin(SMeta *pMeta) {
   return 0;
 }
 
+// commit the meta txn
 int metaCommit(SMeta *pMeta) { return tdbCommit(pMeta->pEnv, &pMeta->txn); }
+
+// abort the meta txn
+int metaAbort(SMeta *pMeta) { return tdbAbort(pMeta->pEnv, &pMeta->txn); }

source/libs/tdb/src/db/tdbDb.c

@@ -66,7 +66,7 @@ int32_t tdbOpen(const char *dbname, int32_t szPage, int32_t pages, TDB **ppDb) {
 
 #ifdef USE_MAINDB
   // open main db
-  ret = tdbTbOpen(TDB_MAINDB_NAME, -1, sizeof(SPgno), NULL, pDb, &pDb->pMainDb);
+  ret = tdbTbOpen(TDB_MAINDB_NAME, -1, sizeof(SBtInfo), NULL, pDb, &pDb->pMainDb);
   if (ret < 0) {
     return -1;
   }
@@ -97,7 +97,7 @@ int tdbClose(TDB *pDb) {
   return 0;
 }
 
-int tdbBegin(TDB *pDb, TXN *pTxn) {
+int32_t tdbBegin(TDB *pDb, TXN *pTxn) {
   SPager *pPager;
   int     ret;
 
@@ -112,7 +112,7 @@ int tdbBegin(TDB *pDb, TXN *pTxn) {
   return 0;
 }
 
-int tdbCommit(TDB *pDb, TXN *pTxn) {
+int32_t tdbCommit(TDB *pDb, TXN *pTxn) {
   SPager *pPager;
   int     ret;
 
@@ -127,6 +127,21 @@ int tdbCommit(TDB *pDb, TXN *pTxn) {
   return 0;
 }
 
+int32_t tdbAbort(TDB *pDb, TXN *pTxn) {
+  SPager *pPager;
+  int     ret;
+
+  for (pPager = pDb->pgrList; pPager; pPager = pPager->pNext) {
+    ret = tdbPagerAbort(pPager, pTxn);
+    if (ret < 0) {
+      ASSERT(0);
+      return -1;
+    }
+  }
+
+  return 0;
+}
+
 SPager *tdbEnvGetPager(TDB *pDb, const char *fname) {
   u32      hash;
   SPager **ppPager;

source/libs/tdb/src/db/tdbPager.c

@@ -253,7 +253,70 @@ int tdbPagerCommit(SPager *pPager, TXN *pTxn) {
   // sync the db file
   tdbOsFSync(pPager->fd);
 
-  // remote the journal file
+  // remove the journal file
+  tdbOsClose(pPager->jfd);
+  tdbOsRemove(pPager->jFileName);
+  pPager->inTran = 0;
+
+  return 0;
+}
+
+// recovery dirty pages
+int tdbPagerAbort(SPager *pPager, TXN *pTxn) {
+  SPage *pPage;
+  int    pgIdx;
+  SPgno  journalSize = 0;
+  int    ret;
+
+  // 0, sync the journal file
+  ret = tdbOsFSync(pPager->jfd);
+  if (ret < 0) {
+    // TODO
+    ASSERT(0);
+    return 0;
+  }
+
+  tdb_fd_t jfd = tdbOsOpen(pPager->jFileName, TDB_O_RDWR, 0755);
+  if (jfd == NULL) {
+    return 0;
+  }
+
+  ret = tdbGetFileSize(jfd, pPager->pageSize, &journalSize);
+  if (ret < 0) {
+    return -1;
+  }
+
+  // 1, read pages from jounal file
+  // 2, write original pages to buffered ones
+
+  /* TODO: reset the buffered pages instead of releasing them
+  // loop to reset the dirty pages from file
+  for (pgIdx = 0, pPage = pPager->pDirty; pPage != NULL && pgIndex < journalSize; pPage = pPage->pDirtyNext, ++pgIdx) {
+    // read pgno & the page from journal
+    SPgno pgno;
+
+    int ret = tdbOsRead(jfd, &pgno, sizeof(pgno));
+    if (ret < 0) {
+      return -1;
+    }
+
+    ret = tdbOsRead(jfd, pageBuf, pPager->pageSize);
+    if (ret < 0) {
+      return -1;
+    }
+  }
+  */
+  // 3, release the dirty pages
+  for (pPage = pPager->pDirty; pPage; pPage = pPager->pDirty) {
+    pPager->pDirty = pPage->pDirtyNext;
+    pPage->pDirtyNext = NULL;
+
+    pPage->isDirty = 0;
+
+    tdbPCacheRelease(pPager->pCache, pPage, pTxn);
+  }
+
+  // 4, remove the journal file
   tdbOsClose(pPager->jfd);
   tdbOsRemove(pPager->jFileName);
   pPager->inTran = 0;
@@ -475,8 +538,7 @@ int tdbPagerRestore(SPager *pPager, SBTree *pBt) {
 
   for (int pgIndex = 0; pgIndex < journalSize; ++pgIndex) {
     // read pgno & the page from journal
-    SPgno  pgno;
-    SPage *pPage;
+    SPgno pgno;
 
     int ret = tdbOsRead(jfd, &pgno, sizeof(pgno));
     if (ret < 0) {

source/libs/tdb/src/inc/tdbInt.h

@@ -189,6 +189,7 @@ int  tdbPagerOpenDB(SPager *pPager, SPgno *ppgno, bool toCreate, SBTree *pBt);
 int  tdbPagerWrite(SPager *pPager, SPage *pPage);
 int  tdbPagerBegin(SPager *pPager, TXN *pTxn);
 int  tdbPagerCommit(SPager *pPager, TXN *pTxn);
+int  tdbPagerAbort(SPager *pPager, TXN *pTxn);
 int  tdbPagerFetchPage(SPager *pPager, SPgno *ppgno, SPage **ppPage, int (*initPage)(SPage *, void *, int), void *arg,
                        TXN *pTxn);
 void tdbPagerReturnPage(SPager *pPager, SPage *pPage, TXN *pTxn);