public async Task <PresaleInfo> SaveOrUpdatePresaleInfoAsync(PresaleInfo presaleInfo)
{
using (var context = this.contextFactory())
{
if (presaleInfo.Id == null || presaleInfo.Id == Guid.Empty)
{
presaleInfo.CreationTimestamp = DateTime.UtcNow;
context.PresaleInfos.Add(presaleInfo);
}
else
{
var presaleInfoFromDb = await context.PresaleInfos.AsNoTracking().SingleOrDefaultAsync(p => p.Id == presaleInfo.Id);
if (presaleInfoFromDb == null)
{
throw new NotFoundException($"Presale info with ID {presaleInfo.Id} could not be found.");
}
context.PresaleInfos.Update(presaleInfo);
context.Entry(presaleInfo).Property(c => c.CreationTimestamp).IsModified = false;
}
await context.SaveChangesAsync();
return(presaleInfo);
}
}
private static async Task MainAsync()
{
Console.WriteLine("==========================");
Console.WriteLine("Starting chain explorer...");
Console.WriteLine("==========================");
try
{
// TODO - fetch last block from db
ulong lastBlock = 0;
//network = "https://mainnet.infura.io";
var web3 = new Web3(network);
// https://nethereum.readthedocs.io/en/latest/nethereum-events-gettingstarted/#contract-filters-and-event-logs
var bidEvent = web3.Eth.GetEvent <MasternodeSoldEventDTO>(contractAddress);
while (true)
{
var balance = await web3.Eth.GetBalance.SendRequestAsync(contractAddress);
var etherAmount = Web3.Convert.FromWei(balance.Value);
Console.WriteLine($"Contract balance in ETH: {etherAmount}");
var fromBlockParameter = new BlockParameter(lastBlock + 1);
var filterAllTransferEventsForContract = bidEvent.CreateFilterInput(fromBlockParameter, null);
var allTransferEventsForContract = await bidEvent.GetAllChanges(filterAllTransferEventsForContract);
// // does not work with infura :(
// var filterAll = await bidEvent.CreateFilterAsync();
// var log = await bidEvent.GetFilterChanges(filterAll);
foreach (var masternodeSoldEvent in allTransferEventsForContract)
{
var block = (ulong)masternodeSoldEvent.Log.BlockNumber.Value;
Console.Write($"block {block}, tx-hash: {masternodeSoldEvent.Log.TransactionHash}");
// check if tx is already in the db - if not, create a new one
var presaleInfo = await dataManager.GetPresaleInfoByTxHashAsync(masternodeSoldEvent.Log.TransactionHash);
if (presaleInfo == null)
{
Console.WriteLine(" --> not in the DB create new entry");
var presaleInfoToAdd = new PresaleInfo();
presaleInfoToAdd.NrOfCoins = nrOfCoins;
presaleInfoToAdd.AdditionalData = "waiting for sending coins";
presaleInfoToAdd.BlockNumber = block;
presaleInfoToAdd.BuyerAddress = masternodeSoldEvent.Event.Buyer;
presaleInfoToAdd.TargetAddressCoins = masternodeSoldEvent.Event.CoinsTargetAddress;
presaleInfoToAdd.Price = Web3.Convert.FromWei(masternodeSoldEvent.Event.Price);
presaleInfoToAdd.Referral = masternodeSoldEvent.Event.Referral;
presaleInfoToAdd.TxHash = masternodeSoldEvent.Log.TransactionHash;
await dataManager.SaveOrUpdatePresaleInfoAsync(presaleInfoToAdd);
await sendCoinsQueueWriter.WriteMessagesToQueueAsync(new[] {
new SendCoinsMessage(presaleInfoToAdd.Id)
});
}
else
{
Console.WriteLine(" --> already in the DB - skip");
}
lastBlock = block;
}
Console.WriteLine($"going to sleep for {sleepTime} seconds...");
await Task.Delay(sleepTime * 1000);
}
}
catch (Exception exception)
{
Console.WriteLine($"{DateTime.UtcNow} > Exception: {exception.Message}");
}
}
