enh(sync): syncNodeOnRequestVoteReplySnapshotCb

source/libs/sync/src/syncRequestVoteReply.c

@@ -93,4 +93,59 @@ int32_t syncNodeOnRequestVoteReplyCb(SSyncNode* ths, SyncRequestVoteReply* pMsg)
   return ret;
 }
 
-int32_t syncNodeOnRequestVoteReplySnapshotCb(SSyncNode* ths, SyncRequestVoteReply* pMsg) { return 0; }
+int32_t syncNodeOnRequestVoteReplySnapshotCb(SSyncNode* ths, SyncRequestVoteReply* pMsg) {
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+  int32_t ret = 0;
+
+  char logBuf[128] = {0};
+  snprintf(logBuf, sizeof(logBuf), "==syncNodeOnRequestVoteReplySnapshotCb== term:%lu", ths->pRaftStore->currentTerm);
+  syncRequestVoteReplyLog2(logBuf, pMsg);
+
+  if (pMsg->term < ths->pRaftStore->currentTerm) {
+    sTrace("DropStaleResponse, receive term:%" PRIu64 ", current term:%" PRIu64 "", pMsg->term,
+           ths->pRaftStore->currentTerm);
+    return ret;
+  }
+
+  // assert(!(pMsg->term > ths->pRaftStore->currentTerm));
+  //  no need this code, because if I receive reply.term, then I must have sent for that term.
+  //   if (pMsg->term > ths->pRaftStore->currentTerm) {
+  //     syncNodeUpdateTerm(ths, pMsg->term);
+  //   }
+
+  if (pMsg->term > ths->pRaftStore->currentTerm) {
+    char logBuf[128] = {0};
+    snprintf(logBuf, sizeof(logBuf), "syncNodeOnRequestVoteReplySnapshotCb error term, receive:%lu current:%lu",
+             pMsg->term, ths->pRaftStore->currentTerm);
+    syncNodePrint2(logBuf, ths);
+    sError("%s", logBuf);
+    return ret;
+  }
+
+  assert(pMsg->term == ths->pRaftStore->currentTerm);
+
+  // This tallies votes even when the current state is not Candidate,
+  // but they won't be looked at, so it doesn't matter.
+  if (ths->state == TAOS_SYNC_STATE_CANDIDATE) {
+    votesRespondAdd(ths->pVotesRespond, pMsg);
+    if (pMsg->voteGranted) {
+      // add vote
+      voteGrantedVote(ths->pVotesGranted, pMsg);
+
+      // maybe to leader
+      if (voteGrantedMajority(ths->pVotesGranted)) {
+        if (!ths->pVotesGranted->toLeader) {
+          syncNodeCandidate2Leader(ths);
+
+          // prevent to leader again!
+          ths->pVotesGranted->toLeader = true;
+        }
+      }
+    } else {
+      ;
+      // do nothing
+      // UNCHANGED <<votesGranted, voterLog>>
+    }
+  }
+
+  return ret;
+}
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