// ----------------------------------------------------------------------
// File: RaftUtils.hh
// Author: Georgios Bitzes - CERN
// ----------------------------------------------------------------------

/************************************************************************
 * quarkdb - a redis-like highly available key-value store              *
 * Copyright (C) 2016 CERN/Switzerland                                  *
 *                                                                      *
 * This program is free software: you can redistribute it and/or modify *
 * it under the terms of the GNU General Public License as published by *
 * the Free Software Foundation, either version 3 of the License, or    *
 * (at your option) any later version.                                  *
 *                                                                      *
 * This program is distributed in the hope that it will be useful,      *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of       *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
 * GNU General Public License for more details.                         *
 *                                                                      *
 * You should have received a copy of the GNU General Public License    *
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.*
 ************************************************************************/

#ifndef QUARKDB_RAFT_UTILS_HH
#define QUARKDB_RAFT_UTILS_HH

#include "raft/RaftCommon.hh"
#include "Common.hh"
#include "raft/RaftTimeouts.hh"
#include <qclient/QClient.hh>

namespace quarkdb {

//------------------------------------------------------------------------------
// Forward declarations
//------------------------------------------------------------------------------
class RaftState; class RaftLease; class RaftContactDetails;

class RaftParser {
public:
  static bool appendEntries(RedisRequest &&source, RaftAppendEntriesRequest &dest);
  static bool appendEntriesResponse(const qclient::redisReplyPtr &source, RaftAppendEntriesResponse &dest);
  static bool heartbeat(const RedisRequest &source, RaftHeartbeatRequest &dest);
  static bool heartbeatResponse(const qclient::redisReplyPtr &source, RaftHeartbeatResponse &dest);
  static bool voteRequest(RedisRequest &source, RaftVoteRequest &dest);
  static bool voteResponse(const qclient::redisReplyPtr &source, RaftVoteResponse &dest);
  static bool fetchResponse(redisReply *source, RaftEntry &entry);
  static bool fetchLastResponse(const qclient::redisReplyPtr &source, std::vector<RaftEntry> &entries);
};

class RaftElection {
public:
  static ElectionOutcome performPreVote(RaftVoteRequest votereq, RaftState &state, const RaftContactDetails &contactDetails);
  static ElectionOutcome perform(RaftVoteRequest votereq, RaftState &state, RaftLease &lease, const RaftContactDetails &contactDetails);
};

}

#endif