95 lines
3.3 KiB
C
95 lines
3.3 KiB
C
/*
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* Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
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*
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* This program is free software: you can use, redistribute, and/or modify
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* it under the terms of the GNU Affero General Public License, version 3
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* or later ("AGPL"), as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "syncRequestVoteReply.h"
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#include "syncInt.h"
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#include "syncRaftStore.h"
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#include "syncUtil.h"
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#include "syncVoteMgr.h"
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// TLA+ Spec
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// HandleRequestVoteResponse(i, j, m) ==
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// \* This tallies votes even when the current state is not Candidate, but
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// \* they won't be looked at, so it doesn't matter.
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// /\ m.mterm = currentTerm[i]
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// /\ votesResponded' = [votesResponded EXCEPT ![i] =
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// votesResponded[i] \cup {j}]
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// /\ \/ /\ m.mvoteGranted
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// /\ votesGranted' = [votesGranted EXCEPT ![i] =
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// votesGranted[i] \cup {j}]
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// /\ voterLog' = [voterLog EXCEPT ![i] =
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// voterLog[i] @@ (j :> m.mlog)]
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// \/ /\ ~m.mvoteGranted
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// /\ UNCHANGED <<votesGranted, voterLog>>
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// /\ Discard(m)
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// /\ UNCHANGED <<serverVars, votedFor, leaderVars, logVars>>
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//
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int32_t syncNodeOnRequestVoteReplyCb(SSyncNode* ths, SyncRequestVoteReply* pMsg) {
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int32_t ret = 0;
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char logBuf[128];
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snprintf(logBuf, sizeof(logBuf), "==syncNodeOnRequestVoteReplyCb== term:%lu", ths->pRaftStore->currentTerm);
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syncRequestVoteReplyLog2(logBuf, pMsg);
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if (pMsg->term < ths->pRaftStore->currentTerm) {
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sTrace("DropStaleResponse, receive term:%" PRIu64 ", current term:%" PRIu64 "", pMsg->term,
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ths->pRaftStore->currentTerm);
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return ret;
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}
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// assert(!(pMsg->term > ths->pRaftStore->currentTerm));
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// no need this code, because if I receive reply.term, then I must have sent for that term.
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// if (pMsg->term > ths->pRaftStore->currentTerm) {
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// syncNodeUpdateTerm(ths, pMsg->term);
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// }
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if (pMsg->term > ths->pRaftStore->currentTerm) {
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char logBuf[128];
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snprintf(logBuf, sizeof(logBuf), "syncNodeOnRequestVoteReplyCb error term, receive:%lu current:%lu", pMsg->term,
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ths->pRaftStore->currentTerm);
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syncNodePrint2(logBuf, ths);
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sError("%s", logBuf);
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return ret;
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}
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assert(pMsg->term == ths->pRaftStore->currentTerm);
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// This tallies votes even when the current state is not Candidate,
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// but they won't be looked at, so it doesn't matter.
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if (ths->state == TAOS_SYNC_STATE_CANDIDATE) {
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votesRespondAdd(ths->pVotesRespond, pMsg);
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if (pMsg->voteGranted) {
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// add vote
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voteGrantedVote(ths->pVotesGranted, pMsg);
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// maybe to leader
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if (voteGrantedMajority(ths->pVotesGranted)) {
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if (!ths->pVotesGranted->toLeader) {
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syncNodeCandidate2Leader(ths);
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// prevent to leader again!
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ths->pVotesGranted->toLeader = true;
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}
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}
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} else {
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;
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// do nothing
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// UNCHANGED <<votesGranted, voterLog>>
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}
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}
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return ret;
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}
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