private static async Task SaveAllAsync()
{
await SemaphoreSave.WaitAsync().ConfigureAwait(false);
try
{
AddressManager.SavePeerFile(_addressManagerFilePath, Network);
SaveSpvChain();
}
finally
{
SemaphoreSave.Release();
}
LocalPartialChain.SaveAsync(_partialChainFolderPath).Wait();
Console.WriteLine($"{nameof(LocalPartialChain)} saved");
}
private static void Reorg()
{
Console.WriteLine($"Reorg detected at {LocalSpvChain.Height}. Handling reog.");
LocalSpvChain.SetTip(LocalSpvChain.Tip.Previous);
LocalPartialChain.ReorgOne();
}
private static async Task BlockPullerJobAsync(CancellationToken ctsToken)
{
while (true)
{
if (ctsToken.IsCancellationRequested)
{
Console.WriteLine($"{nameof(BlockPullerJobAsync)} is stopped.");
return;
}
if (LocalSpvChain.Height < WalletCreationHeight)
{
await Task.Delay(1000, ctsToken).ContinueWith(tsk => { }).ConfigureAwait(false);
continue;
}
int height;
if (LocalPartialChain.BlockCount == 0)
{
height = WalletCreationHeight;
}
else if (LocalSpvChain.Height <= LocalPartialChain.BestHeight)
{
await Task.Delay(100, ctsToken).ContinueWith(tsk => { }).ConfigureAwait(false);
continue;
}
else
{
height = LocalPartialChain.BestHeight + 1;
}
var chainedBlock = LocalSpvChain.GetBlock(height);
BlockPuller.SetLocation(new ChainedBlock(chainedBlock.Previous.Header, chainedBlock.Previous.Height));
Block block = null;
CancellationTokenSource ctsBlockDownload = CancellationTokenSource.CreateLinkedTokenSource(
new CancellationTokenSource(TimeSpan.FromSeconds(timeoutDownSec)).Token,
ctsToken);
try
{
block = await Task.Run(() => BlockPuller.NextBlock(ctsBlockDownload.Token)).ConfigureAwait(false);
}
catch (OperationCanceledException)
{
if (ctsToken.IsCancellationRequested)
{
return;
}
Console.WriteLine($"Failed to download block {chainedBlock.Height} within {timeoutDownSec} seconds. Retry");
if (timeoutDownSec > 180)
{
timeoutDownSec = 20;
_nodes.Purge("no reason");
}
else
{
timeoutDownSec = timeoutDownSec * 2; // adjust to the network speed
}
continue;
}
//reorg test
//if(new Random().Next(100) >= 60) block = null;
if (block == null) // then reorg happened
{
Reorg();
continue;
}
LocalPartialChain.Add(chainedBlock.Height, block);
// check if chains are in sync, to be sure
var bh = LocalPartialChain.BestHeight;
for (int i = bh; i > bh - 6; i--)
{
if (!LocalPartialChain.Chain[i].MerkleProof.Header.GetHash()
.Equals(LocalSpvChain.GetBlock(i).Header.GetHash()))
{
// something worng, reorg
Reorg();
}
}
Console.WriteLine($"Full blocks left to download: {LocalSpvChain.Height - LocalPartialChain.BestHeight}");
}
}