/// <summary>
/// two ways to begin view changing: either one third of all voters requested, or local requested.
///
/// </summary>
/// <returns></returns>
internal async Task BeginChangeViewAsync(ViewChangeReason reason)
{
_log.LogInformation($"BeginChangeViewAsync: VID: {ViewId} Req: {reqMsgs.Count} Reply: {replyMsgs.Count} Commit: {commitMsgs.Count} Votes {commitMsgs.Count}/{LyraGlobal.GetMajority(_context.Board.AllVoters.Count)}/{_context.Board.AllVoters.Count} Replyed: {replySent} Commited: {commitSent}");
_reason = reason;
var lastSb = await _sys.Storage.GetLastServiceBlockAsync();
if (lastSb == null)
{
// genesis?
_log.LogCritical($"BeginChangeViewAsync has null service block. should not happend. error.");
return;
}
_isViewChanging = true;
ShiftView(lastSb.Height + 1);
selectedSuccess = false;
_log.LogInformation($"View change for ViewId {ViewId} begin at {TimeStarted}");
CalculateLeaderCandidate();
var lastCons = await _sys.Storage.GetLastConsolidationBlockAsync();
var req = new ViewChangeRequestMessage
{
From = _sys.PosWallet.AccountId,
ViewID = ViewId,
prevViewID = lastSb.Height,
requestSignature = Signatures.GetSignature(_sys.PosWallet.PrivateKey,
$"{lastSb.Hash}|{lastCons.Hash}", _sys.PosWallet.AccountId),
};
_context.Send2P2pNetwork(req);
await CheckRequestAsync(req);
}
private async Task CheckAllStatsAsync()
{
if (!IsViewChanging)
{
RemoveOutDatedMsgs();
if (reqMsgs.Count > _context.Board.AllVoters.Count - LyraGlobal.GetMajority(_context.Board.AllVoters.Count))
{
var sb = new StringBuilder();
foreach (var msg in reqMsgs)
{
sb.Append($"{msg.Key.Shorten()}, ");
}
_log.LogInformation($"too many view change request, {sb.ToString()}. force into view change mode");
// too many view change request. force into view change mode
await _context.GotViewChangeRequestAsync(ViewId, reqMsgs.Count);
}
return;
}
// request
if (!replySent && reqMsgs.Count >= LyraGlobal.GetMajority(_context.Board.AllVoters.Count))
{
_log.LogInformation($"CheckAllStats VID: {ViewId} Time: {TimeStarted} Req: {reqMsgs.Count} Reply: {replyMsgs.Count} Commit: {commitMsgs.Count} Votes {commitMsgs.Count}/{LyraGlobal.GetMajority(_context.Board.AllVoters.Count)}/{_context.Board.AllVoters.Count} Replyed: {replySent} Commited: {commitSent}");
if (string.IsNullOrEmpty(nextLeader))
{
CalculateLeaderCandidate();
}
var reply = new ViewChangeReplyMessage
{
From = _sys.PosWallet.AccountId,
ViewID = ViewId,
Result = Blocks.APIResultCodes.Success,
Candidate = nextLeader
};
_context.Send2P2pNetwork(reply);
replySent = true;
await CheckReplyAsync(reply);
}
if (!commitSent)
{
if (replyMsgs.Count >= LyraGlobal.GetMajority(_context.Board.AllVoters.Count))
{
_log.LogInformation($"CheckAllStats VID: {ViewId} Time: {TimeStarted} Req: {reqMsgs.Count} Reply: {replyMsgs.Count} Commit: {commitMsgs.Count} Votes {commitMsgs.Count}/{LyraGlobal.GetMajority(_context.Board.AllVoters.Count)}/{_context.Board.AllVoters.Count} Replyed: {replySent} Commited: {commitSent}");
// reply
// only if we have enough reply
var decQr = from rep in replyMsgs.Values
where rep.msg.Result == Blocks.APIResultCodes.Success
group rep by rep.msg.Candidate into g
select new { Candidate = g.Key, Count = g.Count() };
var decisions = decQr.OrderByDescending(x => x.Count).ToList();
var candidateQR = decisions.FirstOrDefault();
var sb = new StringBuilder();
sb.AppendLine($"Decisions for View ID: {ViewId}");
foreach (var x in decisions)
{
sb.AppendLine($"\t{x.Candidate.Shorten()}: {x.Count}");
}
_log.LogInformation(sb.ToString());
if (candidateQR?.Count >= LyraGlobal.GetMajority(_context.Board.AllVoters.Count))
{
var commit = new ViewChangeCommitMessage
{
From = _sys.PosWallet.AccountId,
ViewID = ViewId,
Candidate = candidateQR.Candidate,
Consensus = ConsensusResult.Yea
};
_context.Send2P2pNetwork(commit);
commitSent = true;
await CheckCommitAsync(commit);
}
else
{
//_log.LogInformation($"CheckAllStats, By ReplyMsgs, not commit, top candidate {candidateQR?.Candidate.Shorten()} has {candidateQR?.Count} votes");
}
}
}
if (!selectedSuccess)
{
// commit
var q = from rep in commitMsgs.Values
group rep by rep.msg.Candidate into g
select new { Candidate = g.Key, Count = g.Count() };
var candidate = q.OrderByDescending(x => x.Count).FirstOrDefault();
if (candidate != null)
{
if (nextLeader != candidate.Candidate)
{
_log.LogWarning($"Next Leader {nextLeader} not {candidate.Candidate}");
}
nextLeader = candidate.Candidate;
if (candidate?.Count >= LyraGlobal.GetMajority(_context.Board.AllVoters.Count))
{
_log.LogInformation($"CheckAllStats, By CommitMsgs, leader selected {candidate.Candidate} with {candidate.Count} votes.");
selectedSuccess = true;
_leaderSelected(this, ViewId, candidate.Candidate, candidate.Count, _context.Board.AllVoters);
}
}
}
}