async Task SynchronizeWithPeer(Peer peer)
{
LABEL_SynchronizeWithPeer:
peer.HeaderDownload = new HeaderDownload();
peer.HeaderDownload.Locator = Blockchain.GetLocator();
Header headerRoot = await peer.GetHeaders();
if (headerRoot == null)
{
return;
}
if (headerRoot.HeaderPrevious == Blockchain.HeaderTip)
{
await peer.BuildHeaderchain(
headerRoot,
Blockchain.Height + 1);
bool dataCorrupted = await SynchronizeUTXO(
headerRoot,
peer);
if (dataCorrupted)
{
await Blockchain.LoadImage();
}
return;
}
headerRoot = await peer.SkipDuplicates(headerRoot);
Blockchain.GetStateAtHeader(
headerRoot.HeaderPrevious,
out int heightAncestor,
out double difficultyAncestor);
double difficultyFork = difficultyAncestor +
await peer.BuildHeaderchain(
headerRoot,
heightAncestor + 1);
double difficultyOld = Blockchain.Difficulty;
if (difficultyFork > difficultyOld)
{
if (!await Blockchain.TryFork(
heightAncestor,
headerRoot.HashPrevious))
{
goto LABEL_SynchronizeWithPeer;
}
bool dataCorrupted = await SynchronizeUTXO(
headerRoot,
peer);
if (
dataCorrupted ||
Blockchain.Difficulty <= difficultyOld)
{
Blockchain.DismissFork();
await Blockchain.LoadImage();
}
else
{
Blockchain.Reorganize();
}
}
else if (difficultyFork < difficultyOld)
{
if (peer.IsInbound())
{
string.Format("Fork weaker than Main.")
.Log(LogFile);
peer.FlagDispose = true;
}
else
{
peer.SendHeaders(
new List <Header>()
{
Blockchain.HeaderTip
});
}
}
}