nim-raft/raft/consensus_module.nim

# nim-raft
# Copyright (c) 2023 Status Research & Development GmbH
# Licensed under either of
#  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
#  * MIT license ([LICENSE-MIT](LICENSE-MIT))
# at your option.
# This file may not be copied, modified, or distributed except according to
# those terms.

import types, protocol, log_ops

proc RaftNodeStartElection*[SmCommandType, SmStateType](node: RaftNode[SmCommandType, SmStateType]) {.async.} =
  node.state = rnsCandidate
  node.votedFor = node.id

  for peer in node.peers:
    peer.hasVoted = false
    node.votesFuts.add(node.msgSendCallback(
        RaftMessageRequestVote(lastLogTerm: RaftNodeLogEntryGet(node, RaftNodeLogIndexGet(node)).value.term, lastLogIndex: RaftNodeLogIndexGet(node), senderTerm: node.currentTerm)
      )
    )

  # Process votes (if any)
  for voteFut in node.votesFuts:
    discard await voteFut
    if voteFut.finished and not voteFut.failed:
      for p in node.peers:
        debugEcho repr(voteFut)
        # if p.id == voteFut.senderId:
        #   p.hasVoted = voteFut.granted

  # node.votesFuts.clear

proc RaftNodeAbortElection*[SmCommandType, SmStateType](node: RaftNode[SmCommandType, SmStateType]) =
  for fut in node.voteFuts:
    cancel(fut)
  discard

proc RaftNodeProcessRequestVote*[SmCommandType, SmStateType](node: RaftNode[SmCommandType, SmStateType], msg: RaftMessageRequestVote): Future[RaftMessageRequestVoteResponse] =
  if msg.senderTerm > node.term:
    if msg.lastLogIndex >= RaftNodeLogIndexGet(node) and msg.lastLogTerm >= RaftNodeLogEntryGet(RaftNodeLogIndexGet(node)).term:
      # grant vote
      discard

proc RaftNodeProcessAppendEntries*[SmCommandType, SmStateType](node: RaftNode[SmCommandType, SmStateType], msg: RaftMessageAppendEntries): Future[RaftMessageAppendEntriesResponse] =
  discard

proc RaftNodeQuorumMin[SmCommandType, SmStateType](node: RaftNode[SmCommandType, SmStateType]): bool =
  discard

proc RaftNodeReplicateSmCommand*[SmCommandType, SmStateType](node: RaftNode[SmCommandType, SmStateType], cmd: SmCommandType) =
  discard

proc RaftNodeScheduleRequestVotesCleanUpTimeout*[SmCommandType, SmStateType](node: RaftNode[SmCommandType, SmStateType]) =
  discard

proc RaftNodeLogAppend[SmCommandType, SmStateType](node: RaftNode[SmCommandType, SmStateType], logEntry: RaftNodeLogEntry[SmCommandType]) =
  discard

proc RaftNodeLogTruncate[SmCommandType, SmStateType](node: RaftNode[SmCommandType, SmStateType], truncateIndex: uint64) =
  discard