refactor(sync): add snapshot2 interface

include/libs/sync/syncTools.h

@@ -362,6 +362,11 @@ typedef struct SOffsetAndContLen {
 } SOffsetAndContLen;
 */
 
+// block1: SOffsetAndContLen
+// block2: SOffsetAndContLen Array
+// block3: SRpcMsg Array
+// block4: SRpcMsg pCont Array
+
 typedef struct SyncAppendEntriesBatch {
   uint32_t bytes;
   int32_t  vgId;

source/libs/sync/inc/syncSnapshot.h

@@ -40,8 +40,8 @@ typedef struct SSyncSnapshotSender {
   bool       start;
   int32_t    seq;
   int32_t    ack;
-  void *     pReader;
-  void *     pCurrentBlock;
+  void      *pReader;
+  void      *pCurrentBlock;
   int32_t    blockLen;
   SSnapshot  snapshot;
   SSyncCfg   lastConfig;
@@ -56,20 +56,20 @@ typedef struct SSyncSnapshotSender {
 SSyncSnapshotSender *snapshotSenderCreate(SSyncNode *pSyncNode, int32_t replicaIndex);
 void                 snapshotSenderDestroy(SSyncSnapshotSender *pSender);
 bool                 snapshotSenderIsStart(SSyncSnapshotSender *pSender);
-void                 snapshotSenderStart(SSyncSnapshotSender *pSender, SSnapshot snapshot, void *pReader);
-void                 snapshotSenderStop(SSyncSnapshotSender *pSender, bool finish);
+int32_t              snapshotSenderStart(SSyncSnapshotSender *pSender, SSnapshot snapshot, void *pReader);
+int32_t              snapshotSenderStop(SSyncSnapshotSender *pSender, bool finish);
 int32_t              snapshotSend(SSyncSnapshotSender *pSender);
 int32_t              snapshotReSend(SSyncSnapshotSender *pSender);
 
 cJSON *snapshotSender2Json(SSyncSnapshotSender *pSender);
-char * snapshotSender2Str(SSyncSnapshotSender *pSender);
-char * snapshotSender2SimpleStr(SSyncSnapshotSender *pSender, char *event);
+char  *snapshotSender2Str(SSyncSnapshotSender *pSender);
+char  *snapshotSender2SimpleStr(SSyncSnapshotSender *pSender, char *event);
 
 //---------------------------------------------------
 typedef struct SSyncSnapshotReceiver {
   bool       start;
   int32_t    ack;
-  void *     pWriter;
+  void      *pWriter;
   SyncTerm   term;
   SyncTerm   privateTerm;
   SSnapshot  snapshot;
@@ -80,13 +80,13 @@ typedef struct SSyncSnapshotReceiver {
 
 SSyncSnapshotReceiver *snapshotReceiverCreate(SSyncNode *pSyncNode, SRaftId fromId);
 void                   snapshotReceiverDestroy(SSyncSnapshotReceiver *pReceiver);
-void snapshotReceiverStart(SSyncSnapshotReceiver *pReceiver, SyncTerm privateTerm, SyncSnapshotSend *pBeginMsg);
-bool snapshotReceiverIsStart(SSyncSnapshotReceiver *pReceiver);
-void snapshotReceiverStop(SSyncSnapshotReceiver *pReceiver);
+int32_t snapshotReceiverStart(SSyncSnapshotReceiver *pReceiver, SyncTerm privateTerm, SyncSnapshotSend *pBeginMsg);
+int32_t snapshotReceiverStop(SSyncSnapshotReceiver *pReceiver);
+bool    snapshotReceiverIsStart(SSyncSnapshotReceiver *pReceiver);
 
 cJSON *snapshotReceiver2Json(SSyncSnapshotReceiver *pReceiver);
-char * snapshotReceiver2Str(SSyncSnapshotReceiver *pReceiver);
-char * snapshotReceiver2SimpleStr(SSyncSnapshotReceiver *pReceiver, char *event);
+char  *snapshotReceiver2Str(SSyncSnapshotReceiver *pReceiver);
+char  *snapshotReceiver2SimpleStr(SSyncSnapshotReceiver *pReceiver, char *event);
 
 //---------------------------------------------------
 // on message

source/libs/sync/src/syncAppendEntries.c

@@ -628,6 +628,8 @@ int32_t syncNodeOnAppendEntriesCb(SSyncNode* ths, SyncAppendEntries* pMsg) {
 
 #endif
 
+static int32_t syncNodeMakeLogSame2(SSyncNode* ths, SyncAppendEntriesBatch* pMsg) { return 0; }
+
 static int32_t syncNodeMakeLogSame(SSyncNode* ths, SyncAppendEntries* pMsg) {
   int32_t code;
 
@@ -719,7 +721,282 @@ static bool syncNodeOnAppendEntriesLogOK(SSyncNode* pSyncNode, SyncAppendEntries
   return false;
 }
 
-int32_t syncNodeOnAppendEntriesSnapshot2Cb(SSyncNode* ths, SyncAppendEntriesBatch* pMsg) { return 0; }
+int32_t syncNodeOnAppendEntriesSnapshot2Cb(SSyncNode* ths, SyncAppendEntriesBatch* pMsg) {
+  int32_t ret = 0;
+  int32_t code = 0;
+
+  // if already drop replica, do not process
+  if (!syncNodeInRaftGroup(ths, &(pMsg->srcId)) && !ths->pRaftCfg->isStandBy) {
+    syncNodeEventLog(ths, "recv sync-append-entries-batch, maybe replica already dropped");
+    return ret;
+  }
+
+  // maybe update term
+  if (pMsg->term > ths->pRaftStore->currentTerm) {
+    syncNodeUpdateTerm(ths, pMsg->term);
+  }
+  ASSERT(pMsg->term <= ths->pRaftStore->currentTerm);
+
+  // reset elect timer
+  if (pMsg->term == ths->pRaftStore->currentTerm) {
+    ths->leaderCache = pMsg->srcId;
+    syncNodeResetElectTimer(ths);
+  }
+  ASSERT(pMsg->dataLen >= 0);
+
+  // candidate to follower
+  //
+  // operation:
+  // to follower
+  do {
+    bool condition = pMsg->term == ths->pRaftStore->currentTerm && ths->state == TAOS_SYNC_STATE_CANDIDATE;
+    if (condition) {
+      syncNodeEventLog(ths, "recv sync-append-entries-batch, candidate to follower");
+
+      syncNodeBecomeFollower(ths, "from candidate by append entries");
+      // do not reply?
+      return ret;
+    }
+  } while (0);
+
+  // fake match2
+  //
+  // condition1:
+  // preIndex <= my commit index
+  //
+  // operation:
+  // if hasAppendEntries && pMsg->prevLogIndex == ths->commitIndex, append entry
+  // match my-commit-index or my-commit-index + 1
+  // no operation on log
+  do {
+    bool condition = (pMsg->term == ths->pRaftStore->currentTerm) && (ths->state == TAOS_SYNC_STATE_FOLLOWER) &&
+                     (pMsg->prevLogIndex <= ths->commitIndex);
+    if (condition) {
+      do {
+        char logBuf[128];
+        snprintf(logBuf, sizeof(logBuf),
+                 "recv sync-append-entries-batch, fake match2, pre-index:%ld, pre-term:%lu, datalen:%d",
+                 pMsg->prevLogIndex, pMsg->prevLogTerm, pMsg->dataLen);
+        syncNodeEventLog(ths, logBuf);
+      } while (0);
+
+      SyncIndex matchIndex = ths->commitIndex;
+      bool      hasAppendEntries = pMsg->dataLen > 0;
+      if (hasAppendEntries && pMsg->prevLogIndex == ths->commitIndex) {
+        SRpcMsg rpcMsgArr[SYNC_MAX_BATCH_SIZE];
+        memset(rpcMsgArr, 0, sizeof(rpcMsgArr));
+        int32_t retArrSize = 0;
+        syncAppendEntriesBatch2RpcMsgArray(pMsg, rpcMsgArr, SYNC_MAX_BATCH_SIZE, &retArrSize);
+
+        // make log same
+        do {
+          SyncIndex logLastIndex = ths->pLogStore->syncLogLastIndex(ths->pLogStore);
+          bool      hasExtraEntries = logLastIndex > pMsg->prevLogIndex;
+
+          if (hasExtraEntries) {
+            // make log same, rollback deleted entries
+            code = syncNodeMakeLogSame2(ths, pMsg);
+            ASSERT(code == 0);
+          }
+
+        } while (0);
+
+        // append entry batch
+        for (int32_t i = 0; i < retArrSize; ++i) {
+          SSyncRaftEntry* pAppendEntry = syncEntryBuild(1234);
+          code = ths->pLogStore->syncLogAppendEntry(ths->pLogStore, pAppendEntry);
+          if (code != 0) {
+            return -1;
+          }
+
+          code = syncNodePreCommit(ths, pAppendEntry);
+          ASSERT(code == 0);
+
+          syncEntryDestory(pAppendEntry);
+        }
+
+        // fsync once
+        SSyncLogStoreData* pData = ths->pLogStore->data;
+        SWal*              pWal = pData->pWal;
+        walFsync(pWal, true);
+
+        // update match index
+        matchIndex = pMsg->prevLogIndex + retArrSize;
+      }
+
+      // prepare response msg
+      SyncAppendEntriesReply* pReply = syncAppendEntriesReplyBuild(ths->vgId);
+      pReply->srcId = ths->myRaftId;
+      pReply->destId = pMsg->srcId;
+      pReply->term = ths->pRaftStore->currentTerm;
+      pReply->privateTerm = ths->pNewNodeReceiver->privateTerm;
+      pReply->success = true;
+      pReply->matchIndex = matchIndex;
+
+      // send response
+      SRpcMsg rpcMsg;
+      syncAppendEntriesReply2RpcMsg(pReply, &rpcMsg);
+      syncNodeSendMsgById(&pReply->destId, ths, &rpcMsg);
+      syncAppendEntriesReplyDestroy(pReply);
+
+      return ret;
+    }
+  } while (0);
+
+  // calculate logOK here, before will coredump, due to fake match
+  // bool logOK = syncNodeOnAppendEntriesLogOK(ths, pMsg);
+  bool logOK = true;
+
+  // not match
+  //
+  // condition1:
+  // term < myTerm
+  //
+  // condition2:
+  // !logOK
+  //
+  // operation:
+  // not match
+  // no operation on log
+  do {
+    bool condition1 = pMsg->term < ths->pRaftStore->currentTerm;
+    bool condition2 =
+        (pMsg->term == ths->pRaftStore->currentTerm) && (ths->state == TAOS_SYNC_STATE_FOLLOWER) && !logOK;
+    bool condition = condition1 || condition2;
+
+    if (condition) {
+      char logBuf[128];
+      snprintf(logBuf, sizeof(logBuf), "recv sync-append-entries, not match, pre-index:%ld, pre-term:%lu, datalen:%d",
+               pMsg->prevLogIndex, pMsg->prevLogTerm, pMsg->dataLen);
+      syncNodeEventLog(ths, logBuf);
+
+      // prepare response msg
+      SyncAppendEntriesReply* pReply = syncAppendEntriesReplyBuild(ths->vgId);
+      pReply->srcId = ths->myRaftId;
+      pReply->destId = pMsg->srcId;
+      pReply->term = ths->pRaftStore->currentTerm;
+      pReply->privateTerm = ths->pNewNodeReceiver->privateTerm;
+      pReply->success = false;
+      pReply->matchIndex = SYNC_INDEX_INVALID;
+
+      // send response
+      SRpcMsg rpcMsg;
+      syncAppendEntriesReply2RpcMsg(pReply, &rpcMsg);
+      syncNodeSendMsgById(&pReply->destId, ths, &rpcMsg);
+      syncAppendEntriesReplyDestroy(pReply);
+
+      return ret;
+    }
+  } while (0);
+
+  // really match
+  //
+  // condition:
+  // logOK
+  //
+  // operation:
+  // match
+  // make log same
+  do {
+    bool condition = (pMsg->term == ths->pRaftStore->currentTerm) && (ths->state == TAOS_SYNC_STATE_FOLLOWER) && logOK;
+    if (condition) {
+      // has extra entries (> preIndex) in local log
+      SyncIndex myLastIndex = syncNodeGetLastIndex(ths);
+      bool      hasExtraEntries = myLastIndex > pMsg->prevLogIndex;
+
+      // has entries in SyncAppendEntries msg
+      bool hasAppendEntries = pMsg->dataLen > 0;
+
+      char logBuf[128];
+      snprintf(logBuf, sizeof(logBuf), "recv sync-append-entries, match, pre-index:%ld, pre-term:%lu, datalen:%d",
+               pMsg->prevLogIndex, pMsg->prevLogTerm, pMsg->dataLen);
+      syncNodeEventLog(ths, logBuf);
+
+      if (hasExtraEntries) {
+        // make log same, rollback deleted entries
+        // code = syncNodeMakeLogSame(ths, pMsg);
+        ASSERT(code == 0);
+      }
+
+      int32_t retArrSize = 0;
+      if (hasAppendEntries) {
+        SRpcMsg rpcMsgArr[SYNC_MAX_BATCH_SIZE];
+        memset(rpcMsgArr, 0, sizeof(rpcMsgArr));
+        syncAppendEntriesBatch2RpcMsgArray(pMsg, rpcMsgArr, SYNC_MAX_BATCH_SIZE, &retArrSize);
+
+        // append entry batch
+        for (int32_t i = 0; i < retArrSize; ++i) {
+          SSyncRaftEntry* pAppendEntry = syncEntryBuild(1234);
+          code = ths->pLogStore->syncLogAppendEntry(ths->pLogStore, pAppendEntry);
+          if (code != 0) {
+            return -1;
+          }
+
+          code = syncNodePreCommit(ths, pAppendEntry);
+          ASSERT(code == 0);
+
+          syncEntryDestory(pAppendEntry);
+        }
+
+        // fsync once
+        SSyncLogStoreData* pData = ths->pLogStore->data;
+        SWal*              pWal = pData->pWal;
+        walFsync(pWal, true);
+      }
+
+      // prepare response msg
+      SyncAppendEntriesReply* pReply = syncAppendEntriesReplyBuild(ths->vgId);
+      pReply->srcId = ths->myRaftId;
+      pReply->destId = pMsg->srcId;
+      pReply->term = ths->pRaftStore->currentTerm;
+      pReply->privateTerm = ths->pNewNodeReceiver->privateTerm;
+      pReply->success = true;
+      pReply->matchIndex = hasAppendEntries ? pMsg->prevLogIndex + retArrSize : pMsg->prevLogIndex;
+
+      // send response
+      SRpcMsg rpcMsg;
+      syncAppendEntriesReply2RpcMsg(pReply, &rpcMsg);
+      syncNodeSendMsgById(&pReply->destId, ths, &rpcMsg);
+      syncAppendEntriesReplyDestroy(pReply);
+
+      // maybe update commit index, leader notice me
+      if (pMsg->commitIndex > ths->commitIndex) {
+        // has commit entry in local
+        if (pMsg->commitIndex <= ths->pLogStore->syncLogLastIndex(ths->pLogStore)) {
+          // advance commit index to sanpshot first
+          SSnapshot snapshot;
+          ths->pFsm->FpGetSnapshotInfo(ths->pFsm, &snapshot);
+          if (snapshot.lastApplyIndex >= 0 && snapshot.lastApplyIndex > ths->commitIndex) {
+            SyncIndex commitBegin = ths->commitIndex;
+            SyncIndex commitEnd = snapshot.lastApplyIndex;
+            ths->commitIndex = snapshot.lastApplyIndex;
+
+            char eventLog[128];
+            snprintf(eventLog, sizeof(eventLog), "commit by snapshot from index:%ld to index:%ld", commitBegin,
+                     commitEnd);
+            syncNodeEventLog(ths, eventLog);
+          }
+
+          SyncIndex beginIndex = ths->commitIndex + 1;
+          SyncIndex endIndex = pMsg->commitIndex;
+
+          // update commit index
+          ths->commitIndex = pMsg->commitIndex;
+
+          // call back Wal
+          code = ths->pLogStore->updateCommitIndex(ths->pLogStore, ths->commitIndex);
+          ASSERT(code == 0);
+
+          code = syncNodeCommit(ths, beginIndex, endIndex, ths->state);
+          ASSERT(code == 0);
+        }
+      }
+      return ret;
+    }
+  } while (0);
+
+  return ret;
+}
 
 int32_t syncNodeOnAppendEntriesSnapshotCb(SSyncNode* ths, SyncAppendEntries* pMsg) {
   int32_t ret = 0;

source/libs/sync/src/syncSnapshot.c

@@ -80,7 +80,7 @@ void snapshotSenderDestroy(SSyncSnapshotSender *pSender) {
 bool snapshotSenderIsStart(SSyncSnapshotSender *pSender) { return pSender->start; }
 
 // begin send snapshot by snapshot, pReader
-void snapshotSenderStart(SSyncSnapshotSender *pSender, SSnapshot snapshot, void *pReader) {
+int32_t snapshotSenderStart(SSyncSnapshotSender *pSender, SSnapshot snapshot, void *pReader) {
   ASSERT(!snapshotSenderIsStart(pSender));
 
   // init snapshot and reader
@@ -181,9 +181,11 @@ void snapshotSenderStart(SSyncSnapshotSender *pSender, SSnapshot snapshot, void
     syncNodeEventLog(pSender->pSyncNode, eventLog);
     taosMemoryFree(eventLog);
   } while (0);
+
+  return 0;
 }
 
-void snapshotSenderStop(SSyncSnapshotSender *pSender, bool finish) {
+int32_t snapshotSenderStop(SSyncSnapshotSender *pSender, bool finish) {
   // close reader
   if (pSender->pReader != NULL) {
     int32_t ret = pSender->pSyncNode->pFsm->FpSnapshotStopRead(pSender->pSyncNode->pFsm, pSender->pReader);
@@ -208,6 +210,8 @@ void snapshotSenderStop(SSyncSnapshotSender *pSender, bool finish) {
     syncNodeEventLog(pSender->pSyncNode, eventLog);
     taosMemoryFree(eventLog);
   } while (0);
+
+  return 0;
 }
 
 // when sender receive ack, call this function to send msg from seq
@@ -349,14 +353,14 @@ cJSON *snapshotSender2Json(SSyncSnapshotSender *pSender) {
 
 char *snapshotSender2Str(SSyncSnapshotSender *pSender) {
   cJSON *pJson = snapshotSender2Json(pSender);
-  char * serialized = cJSON_Print(pJson);
+  char  *serialized = cJSON_Print(pJson);
   cJSON_Delete(pJson);
   return serialized;
 }
 
 char *snapshotSender2SimpleStr(SSyncSnapshotSender *pSender, char *event) {
   int32_t len = 256;
-  char *  s = taosMemoryMalloc(len);
+  char   *s = taosMemoryMalloc(len);
 
   SRaftId  destId = pSender->pSyncNode->replicasId[pSender->replicaIndex];
   char     host[64];
@@ -471,7 +475,7 @@ static void snapshotReceiverForceStop(SSyncSnapshotReceiver *pReceiver) {
 
 // if receiver receive msg from seq = SYNC_SNAPSHOT_SEQ_BEGIN, start receiver
 // if already start, force close, start again
-void snapshotReceiverStart(SSyncSnapshotReceiver *pReceiver, SyncTerm privateTerm, SyncSnapshotSend *pBeginMsg) {
+int32_t snapshotReceiverStart(SSyncSnapshotReceiver *pReceiver, SyncTerm privateTerm, SyncSnapshotSend *pBeginMsg) {
   if (!snapshotReceiverIsStart(pReceiver)) {
     // first start
     snapshotReceiverDoStart(pReceiver, privateTerm, pBeginMsg);
@@ -486,9 +490,11 @@ void snapshotReceiverStart(SSyncSnapshotReceiver *pReceiver, SyncTerm privateTer
     // start again
     snapshotReceiverDoStart(pReceiver, privateTerm, pBeginMsg);
   }
+
+  return 0;
 }
 
-void snapshotReceiverStop(SSyncSnapshotReceiver *pReceiver) {
+int32_t snapshotReceiverStop(SSyncSnapshotReceiver *pReceiver) {
   if (pReceiver->pWriter != NULL) {
     int32_t ret =
         pReceiver->pSyncNode->pFsm->FpSnapshotStopWrite(pReceiver->pSyncNode->pFsm, pReceiver->pWriter, false);
@@ -506,6 +512,8 @@ void snapshotReceiverStop(SSyncSnapshotReceiver *pReceiver) {
     syncNodeEventLog(pReceiver->pSyncNode, eventLog);
     taosMemoryFree(eventLog);
   } while (0);
+
+  return 0;
 }
 
 static int32_t snapshotReceiverFinish(SSyncSnapshotReceiver *pReceiver, SyncSnapshotSend *pMsg) {
@@ -604,7 +612,7 @@ cJSON *snapshotReceiver2Json(SSyncSnapshotReceiver *pReceiver) {
     cJSON_AddStringToObject(pFromId, "addr", u64buf);
     {
       uint64_t u64 = pReceiver->fromId.addr;
-      cJSON *  pTmp = pFromId;
+      cJSON   *pTmp = pFromId;
       char     host[128] = {0};
       uint16_t port;
       syncUtilU642Addr(u64, host, sizeof(host), &port);
@@ -637,14 +645,14 @@ cJSON *snapshotReceiver2Json(SSyncSnapshotReceiver *pReceiver) {
 
 char *snapshotReceiver2Str(SSyncSnapshotReceiver *pReceiver) {
   cJSON *pJson = snapshotReceiver2Json(pReceiver);
-  char * serialized = cJSON_Print(pJson);
+  char  *serialized = cJSON_Print(pJson);
   cJSON_Delete(pJson);
   return serialized;
 }
 
 char *snapshotReceiver2SimpleStr(SSyncSnapshotReceiver *pReceiver, char *event) {
   int32_t len = 256;
-  char *  s = taosMemoryMalloc(len);
+  char   *s = taosMemoryMalloc(len);
 
   SRaftId  fromId = pReceiver->fromId;
   char     host[128];