private async Task ElectionTimeoutTask(CancellationToken cancelationToken)
{
var timeout = RandomElectionTimeout();
Console.WriteLine($" timeout{timeout} node {Id.N} temen{_currentTerm.N}");
// loop, sleeping for ~ the broadcast (timeout) time. If
// we have gone too long without
while (!_timeoutCancellationSource.IsCancellationRequested)
{
var sinceHeartbeat = DateTime.Now - _lastHeartbeat;
if (sinceHeartbeat > timeout)
{
ResetElectionTimer();
Supervised.Run(function: TransitionToCandidate);
continue;
}
try
{
var sinceHeartbeat2 = DateTime.Now - _lastHeartbeat;
await Task.Delay(timeout - sinceHeartbeat2, cancelationToken);
}
catch (TaskCanceledException)
{
// cancelled or disposed means we are no longer a
// follower, so end this task
return;
}
catch (ObjectDisposedException)
{
return;
}
}
}
private Task TransitionToFollower()
{
if (_state != State.Follower)
{
_state = State.Follower;
_timeoutCancellationSource = new CancellationTokenSource();
Supervised.Run(() => ElectionTimeoutTask(_timeoutCancellationSource.Token));
}
return(Task.CompletedTask);
}
