/// <summary>
/// Saves block header to local storage
/// </summary>
/// <param name="block_header">Block header to save</param>
/// <exception cref="Exception">Exception occured while saving block header.</exception>
public static bool saveBlockHeader(BlockHeader block_header)
{
if (stopped)
{
return(false);
}
lock (lockObject)
{
ulong block_num = block_header.blockNum;
ulong file_block_num = ((ulong)(block_num / CoreConfig.maxBlockHeadersPerDatabase)) * CoreConfig.maxBlockHeadersPerDatabase;
string db_path = path + Path.DirectorySeparatorChar + "0000" + Path.DirectorySeparatorChar + file_block_num + ".dat";
FileStream fs = getStorageFile(db_path, true); // File.Open(db_path, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None);
if (fs.Length > 0)
{
fs.Seek(-8, SeekOrigin.End);
byte[] file_block_header_bytes = new byte[8];
fs.Read(file_block_header_bytes, 0, 8);
if (BitConverter.ToUInt64(file_block_header_bytes, 0) + 1 != block_num)
{
// TODO should probably delete the file and reset lastBlockHeader
return(false);
}
}
try
{
// insert dummy block for first block
if (block_num == 1)
{
BlockHeader dummy_block_header = new BlockHeader();
dummy_block_header.blockNum = 0;
dummy_block_header.blockChecksum = new byte[1];
byte[] dummy_block_header_bytes = dummy_block_header.getBytes();
byte[] dummy_block_header_len_bytes = BitConverter.GetBytes(dummy_block_header_bytes.Length);
fs.Write(dummy_block_header_len_bytes, 0, dummy_block_header_len_bytes.Length);
fs.Write(dummy_block_header_bytes, 0, dummy_block_header_bytes.Length);
byte[] dummy_block_num_bytes = BitConverter.GetBytes(dummy_block_header.blockNum);
fs.Write(dummy_block_num_bytes, 0, dummy_block_num_bytes.Length);
}
byte[] block_header_bytes = block_header.getBytes();
byte[] block_header_len_bytes = BitConverter.GetBytes(block_header_bytes.Length);
fs.Write(block_header_len_bytes, 0, block_header_len_bytes.Length);
fs.Write(block_header_bytes, 0, block_header_bytes.Length);
byte[] block_num_bytes = BitConverter.GetBytes(block_header.blockNum);
fs.Write(block_num_bytes, 0, block_num_bytes.Length);
lastBlockHeaderTime = Clock.getTimestamp();
}
catch (Exception e)
{
Logging.error("Exception occured while saving block header: {0}", e);
return(false);
}
return(true);
}
}
