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Add HigherBallot message to automatize presidency change

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This commit is contained in:
Julien CLEMENT 2020-05-07 13:29:27 +02:00
parent c68c0a8a07
commit 09f005406a
2 changed files with 42 additions and 1 deletions
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39
src/legislator/legislator.cc
View File

@ -66,6 +66,7 @@ namespace paxos
log("but it was discarded because ballot " + std::to_string(ballot)
+ " is inferior or equal to nextBallot "
+ std::to_string(next_ballot), red);
send_higher_ballot(next_ballot, sender);
return;
}
ledger.set_next_bal(ballot);
@ -74,6 +75,35 @@ namespace paxos
send_last_vote(ballot, previous_vote, sender);
}
void Legislator::send_higher_ballot(int ballot, std::string receiver)
{
Message message;
message.set_method("HigherBallot");
message.add_header("ballot", std::to_string(ballot));
SendEW::send_message(message, legislators[receiver]);
}
void Legislator::receive_higher_ballot(Message message)
{
std::string ballot_str = *message.get_header("ballot");
log(config_.name + " has received a HigherBallot("
+ ballot_str + ")", red);
receive_higher_ballot(std::stoi(ballot_str));
}
void Legislator::receive_higher_ballot(int ballot)
{
int last_tried = ledger.last_tried();
while (last_tried + (int)legislators.size() < ballot)
{
last_tried += legislators.size();
}
ledger.set_last_tried(last_tried);
initiate_ballot();
}
void Legislator::send_last_vote(int ballot, Vote previous_vote,
std::string sender)
{
@ -193,8 +223,13 @@ namespace paxos
void Legislator::receive_begin_ballot(int ballot, int decree_id,
std::string sender)
{
if (ballot != ledger.next_bal())
int next_ballot = ledger.next_bal();
if (ballot != next_ballot)
{
if (ballot < next_ballot)
send_higher_ballot(next_ballot, sender);
return;
}
Vote vote;
vote.ballot_id = ballot;
Decree decree;
@ -288,5 +323,7 @@ namespace paxos
receive_voted(message);
else if (method == "Success")
receive_success(message);
else if (method == "HigherBallot")
receive_higher_ballot(message);
}
}

4
src/legislator/legislator.hh
View File

@ -22,6 +22,10 @@ namespace paxos
void receive_next_ballot(Message message);
void receive_next_ballot(int ballot, std::string sender);
void send_higher_ballot(int ballot, std::string receiver);
void receive_higher_ballot(Message message);
void receive_higher_ballot(int ballot);
void send_last_vote(int ballot, Vote previous_vote, std::string sender);
void receive_last_vote(Message message);
void receive_enough_last_vote();