/// <summary>
/// 单独给每一个节点发送心跳信息 和日志信息，
/// 如果收到有的节点返回的任期大于当前的任期则节点变为follower
/// </summary>
/// <returns></returns>
private async Task SendHeartbatAsync()
{
var peers = _configProviders.GetPeersExcludeSelf(_node.GetChannelId());
if (peers.Count() == 0)
{
return;
}
//根据提供的节点进行数据访问
PeerStates = PeerStates.Where(p => peers.Select(x => x.Id).Contains(p.Peer.Id)).ToList();
if (PeerStates.Count != peers.Count)
{
var peersNotInPeerStates = peers.Where(p => !PeerStates.Select(x => x.Peer.Id).Contains(p.Id)).ToList();
peersNotInPeerStates.ForEach(p =>
{
var model = new PeerState(p);
PeerStates.Add(new PeerState(p));
});
}
var lastlog = _blockDataManager.GetLastBlockEntity(_node.GetChannelId());
var heartbeat = new HeartBeat();
heartbeat.Term = CurrentState.CurrentTerm;
heartbeat.LeaderId = CurrentState.Id;
heartbeat.Height = lastlog.Header.Number;
heartbeat.LogCurrentHash = lastlog.Header.DataHash;
heartbeat.LogPreviousHash = lastlog.Header.PreviousHash;
heartbeat.LogTerm = lastlog.Header.Term;
heartbeat.ChannelId = lastlog.Header.ChannelId;
//获取所需要的区块数据
var needBecomeFollower = false;
HeartBeatResponse heartResponse = null;
foreach (var item in PeerStates)
{
if (item.HeartBeatTask == null)
{
item.HeartBeatTask = HeartBeatRequest(item.Peer, heartbeat);
}
else
{
_logger.LogInformation($"{item.Peer.Id} {item.HeartBeatTask.IsCompleted}");
//请求完毕就可以重新再发生请求
if (item.HeartBeatTask != null && item.HeartBeatTask.IsCompleted)
{
try
{
var rs = await item.HeartBeatTask;
//如果返回节点任期大于当前节点任期 则需要变更节点状态
if (rs.Term > CurrentState.CurrentTerm)
{
needBecomeFollower = true;
heartResponse = rs;
break;
}
item.CurrentHash = rs.BlockCurrentHash;
item.PreviousHash = rs.BlockPreviousHash;
item.Height = rs.Height;
item.LogTerm = rs.LogTerm;
}
catch (Exception ex)
{
_logger.LogInformation($"心跳请求失败{ex.Message}");
}
finally
{
item.HeartBeatTask = null;
}
}
}
}
if (needBecomeFollower)
{
CurrentState.CurrentTerm = heartbeat.Term;
BecomeFollower();
}
}