protected virtual void SetupJobUpdates()
{
if (!poolConfig.EnableInternalStratum)
{
return;
}
jobRebroadcastTimeout = TimeSpan.FromSeconds(Math.Max(1, poolConfig.JobRebroadcastTimeout));
var sources = new List <IObservable <bool> >();
var cancelTimeout = new List <IObservable <bool> >();
// collect ports
var zmq = poolConfig.Daemons
.Where(x => !string.IsNullOrEmpty(x.Extra.SafeExtensionDataAs <BitcoinDaemonEndpointConfigExtra>()?.ZmqBlockNotifySocket))
.ToDictionary(x => x, x => x.Extra.SafeExtensionDataAs <BitcoinDaemonEndpointConfigExtra>().ZmqBlockNotifySocket);
if (zmq.Count > 0)
{
logger.Info(() => $"[{LogCat}] Subscribing to ZMQ push-updates from {string.Join(", ", zmq.Values)}");
var newJobsPubSub = daemon.ZmqSubscribe(zmq, BitcoinConstants.ZmqPublisherTopicBlockHash, 2)
.Select(frames =>
{
try
{
// second frame contains the block hash as binary data
if (frames.Length > 1)
{
var hash = frames[1].ToHexString();
return(hash);
}
}
finally
{
frames.Dispose();
}
return(null);
})
.Where(x => x != null)
.DistinctUntilChanged()
.Select(_ => Observable.FromAsync(() => UpdateJob(false, "ZMQ pub/sub")))
.Concat()
.Publish()
.RefCount();
sources.Add(newJobsPubSub);
cancelTimeout.Add(newJobsPubSub);
}
if (poolConfig.BlockRefreshInterval > 0)
{
// periodically update block-template from daemon
var newJobsPolled = Observable.Interval(TimeSpan.FromMilliseconds(poolConfig.BlockRefreshInterval))
.Select(_ => Observable.FromAsync(() => UpdateJob(false, "RPC polling")))
.Concat()
.Where(isNew => isNew)
.Publish()
.RefCount();
sources.Add(newJobsPolled);
cancelTimeout.Add(newJobsPolled);
}
else
{
// poll for the first successful update after which polling is suspended forever
var newJobsPolled = Observable.Interval(TimeSpan.FromMilliseconds(poolConfig.BlockRefreshInterval))
.Select(_ => Observable.FromAsync(() => UpdateJob(false, "RPC polling")))
.Concat()
.Where(isNew => isNew)
.Take(1)
.Publish()
.RefCount();
sources.Add(newJobsPolled);
cancelTimeout.Add(newJobsPolled);
}
// if there haven't been any new jobs for a while, force an update
var cancelRebroadcast = cancelTimeout.Count > 0 ?
cancelTimeout.Count > 1 ? Observable.Merge(cancelTimeout) : cancelTimeout.First() :
Observable.Never <bool>();
sources.Add(Observable.Timer(jobRebroadcastTimeout)
.TakeUntil(cancelRebroadcast) // cancel timeout if an actual new job has been detected
.Do(_ => logger.Debug(() => $"[{LogCat}] No new blocks for {jobRebroadcastTimeout.TotalSeconds} seconds - updating transactions & rebroadcasting work"))
.Select(x => Observable.FromAsync(() => UpdateJob(true)))
.Concat()
.Repeat());
Jobs = Observable.Merge(sources)
.Select(GetJobParamsForStratum);
}