private async void syncBlockchains(List <NodeConnection> notSyncNodeConnections, Block lastBlock)
{
var tasks = new List <Task <List <Transaction> > >();
foreach (var connection in notSyncNodeConnections)
{
var lastBlockHeight = await connection.LastBlockHeight();
if (lastBlockHeight > lastBlock.Height)
{
var conBlockHashes = await connection.BlockHashes();
if (conBlockHashes != null)
{
var localBlockHashes = _blockChain.BlockHashes();
var smallerListEnd = conBlockHashes.Count < localBlockHashes.Count ? conBlockHashes.Count : localBlockHashes.Count;
var indexNotSame = 0;
for (int i = 0; i < smallerListEnd; i++)
{
if (conBlockHashes[i] != localBlockHashes[i])
{
indexNotSame = i + 1;
break;
}
}
if (indexNotSame > 0)
{
try
{
if (conBlockHashes.Count - indexNotSame < 50)
{
var alternateBlockChain = await connection.GetBlocks(Enumerable.Range(indexNotSame, conBlockHashes.Count + 1).ToList());
using (BlockchainDbContext db = new BlockchainDbContext())
{
var blocksToDelete = db.Blocks.Where(b => b.Height >= indexNotSame).ToList();
blocksToDelete.ForEach(b => db.Blocks.Remove(b));
db.SaveChanges();
alternateBlockChain.ForEach(b => db.Blocks.Add(b));
db.SaveChanges();
}
}
else
{
if (_blockChain.NextBlock != null)
{
_blockChain.NextBlock.StopMining();
await Task.Delay(5000);
}
using (BlockchainDbContext db = new BlockchainDbContext())
{
var blocksToDelete = db.Blocks.ToList();
blocksToDelete.ForEach(b => db.Blocks.Remove(b));
db.SaveChanges();
}
}
}
catch (Exception exc)
{
}
}
}
}
}
}