private void PrepareBloom()
{
if (_bloom != null)
{
// already prepared
return;
}
_contractAddress =
_smartContractAddressService.GetZeroSmartContractAddress();
_interestedEvent = new ChainPrimaryTokenSymbolSet();
_logEvent = _interestedEvent.ToLogEvent(_contractAddress);
_bloom = _logEvent.GetBloom();
}
public async Task <string> GetPrimaryTokenSymbol()
{
PrepareBloom();
var blockHeader = await _blockchainService.GetBestChainLastBlockHeaderAsync();
if (blockHeader.Height != Constants.GenesisBlockHeight)
{
return(null);
}
var block = await _blockchainService.GetBlockByHashAsync(blockHeader.GetHash());
if (!_bloom.IsIn(new Bloom(block.Header.Bloom.ToByteArray())))
{
// No interested event in the block
return(null);
}
Logger.LogTrace("ChainPrimaryTokenSymbolSet event received.");
foreach (var transactionId in block.Body.TransactionIds)
{
var result = await _transactionResultQueryService.GetTransactionResultAsync(transactionId);
if (result == null)
{
Logger.LogTrace($"Transaction result is null, transactionId: {transactionId}");
continue;
}
if (result.Status == TransactionResultStatus.Failed)
{
Logger.LogTrace(
$"Transaction failed, transactionId: {transactionId}, error: {result.Error}");
continue;
}
if (result.Bloom.Length == 0 || !_bloom.IsIn(new Bloom(result.Bloom.ToByteArray())))
{
continue;
}
foreach (var log in result.Logs)
{
if (log.Address != _contractAddress || log.Name != _logEvent.Name)
{
continue;
}
var message = new ChainPrimaryTokenSymbolSet();
message.MergeFrom(log);
Logger.LogTrace($"Chain primary token symbol: {message.TokenSymbol}");
return(message.TokenSymbol);
}
}
return(null);
}
