private BlockVm GenerateBlock(object @object)
{
try
{
BlockVm block = (BlockVm)@object;
Task <byte[]> hashGenerationProcess = new Task <byte[]>((obj) => BlockHashing.ComputeBlockHashPoW((BlockVm)obj), block);
hashGenerationProcess.Start();
while (!hashGenerationProcess.IsCompleted)
{
blockGenerationCancellToken.ThrowIfCancellationRequested();
Task.Delay(250).Wait();
}
block.Header.Hash = hashGenerationProcess.Result;
block.Header.Sign = Encryptor.GetSign(BlockHashing.GetBlockBytes(block), NodeData.Instance.NodeKeys.SignPrivateKey, NodeData.Instance.NodeKeys.Password);
block.Header.SignKeyId = NodeData.Instance.NodeKeys.KeyId;
using (BlockchainDbContext context = new BlockchainDbContext())
{
var resultBlock = context.Add(BlockBuilder.GetBlock(block));
context.SaveChanges();
return(BlockBuilder.GetBlockVm(resultBlock.Entity));
}
}
catch (Exception ex)
{
throw new BlockGenerationException("An error occurred while generating the block.", ex);
}
}
private async Task SaveAndRemoveOldBlocksAsync(long blockId)
{
using (BlockchainDbContext context = new BlockchainDbContext())
{
long maxId = await context.Blocks.MaxAsync(opt => opt.Id).ConfigureAwait(false);
byte limit = 100;
if (maxId < blockId)
{
return;
}
for (long i = blockId; i < maxId; i += limit)
{
var blocks = await context.Blocks
.Include(opt => opt.BlockSegments)
.ThenInclude(opt => opt.SegmentHeader)
.Include(opt => opt.Header)
.Where(opt => opt.Id > i)
.Take(limit)
.ToListAsync().ConfigureAwait(false);
var obsoleteBlocks = blocks.Select(opt => new ObsoleteBlock
{
Id = opt.Id,
Data = ObjectSerializer.ObjectToByteArray(BlockBuilder.GetBlockVm(opt))
});
await context.ObsoleteBlocks.AddRangeAsync(obsoleteBlocks).ConfigureAwait(false);
await context.SaveChangesAsync().ConfigureAwait(false);
}
NpgsqlParameter blockIdParam = new NpgsqlParameter("blockId", blockId);
RawSqlString sqlString = new RawSqlString(@"DELETE FROM ""Blocks"" WHERE ""Id"" > @blockId");
await context.Database.ExecuteSqlCommandAsync(sqlString, blockIdParam).ConfigureAwait(false);
}
}