private void OnRegister(VersionPayload version)
{
Context.Watch(Sender);
TaskSession session = new TaskSession(Sender, version);
sessions.Add(Sender, session);
RequestTasks(session);
}
private void RequestTasks(TaskSession session)
{
if (session.HasTask)
{
return;
}
if (session.AvailableTasks.Count > 0)
{
session.AvailableTasks.ExceptWith(knownHashes);
session.AvailableTasks.RemoveWhere(p => Blockchain.Singleton.ContainsBlock(p));
HashSet <UInt256> hashes = new HashSet <UInt256>(session.AvailableTasks);
if (hashes.Count > 0)
{
foreach (UInt256 hash in hashes.ToArray())
{
if (!IncrementGlobalTask(hash))
{
hashes.Remove(hash);
}
}
session.AvailableTasks.ExceptWith(hashes);
foreach (UInt256 hash in hashes)
{
session.Tasks[hash] = DateTime.UtcNow;
}
foreach (InvPayload group in InvPayload.CreateGroup(InventoryType.Block, hashes.ToArray()))
{
session.RemoteNode.Tell(Message.Create("getdata", group));
}
return;
}
}
if ((!HasHeaderTask || globalTasks[HeaderTaskHash] < MaxConncurrentTasks) &&
(Blockchain.Singleton.HeaderHeight < session.Version.StartHeight ||
(Blockchain.Singleton.Height == Blockchain.Singleton.HeaderHeight &&
Blockchain.Singleton.HeaderHeight >= sessions.Select(x => x.Value.Version.StartHeight).Max() &&
TimeProvider.Current.UtcNow.ToTimestamp() - 60 >= Blockchain.Singleton.GetBlock(Blockchain.Singleton.CurrentHeaderHash)?.Timestamp)))
{
session.Tasks[HeaderTaskHash] = DateTime.UtcNow;
IncrementGlobalTask(HeaderTaskHash);
session.RemoteNode.Tell(Message.Create("getheaders", GetBlocksPayload.Create(Blockchain.Singleton.CurrentHeaderHash)));
}
else if (Blockchain.Singleton.Height < session.Version.StartHeight)
{
UInt256 hash = Blockchain.Singleton.CurrentBlockHash;
for (uint i = Blockchain.Singleton.Height + 1; i <= Blockchain.Singleton.HeaderHeight; i++)
{
hash = Blockchain.Singleton.GetBlockHash(i);
if (!globalTasks.ContainsKey(hash))
{
hash = Blockchain.Singleton.GetBlockHash(i - 1);
break;
}
}
session.RemoteNode.Tell(Message.Create("getblocks", GetBlocksPayload.Create(hash)));
}
}