public static WalletHistoryModel GetHistory(IWalletManager walletManager, Network network, WalletHistoryRequest request)
{
var model = new WalletHistoryModel();
// Get a list of all the transactions found in an account (or in a wallet if no account is specified), with the addresses associated with them.
IEnumerable <AccountHistory> accountsHistory = walletManager.GetHistory(request.WalletName, request.AccountName);
foreach (AccountHistory accountHistory in accountsHistory)
{
var transactionItems = new List <TransactionItemModel>();
var uniqueProcessedTxIds = new HashSet <uint256>();
IEnumerable <FlatHistory> query = accountHistory.History;
if (!string.IsNullOrEmpty(request.Address))
{
query = query.Where(x => x.Address.Address == request.Address);
}
// Sorting the history items by descending dates. That includes received and sent dates.
List <FlatHistory> items = query
.OrderBy(o => o.Transaction.IsConfirmed() ? 1 : 0)
.ThenByDescending(o => o.Transaction.SpendingDetails?.CreationTime ?? o.Transaction.CreationTime)
.ToList();
// Represents a sublist containing only the transactions that have already been spent.
List <FlatHistory> spendingDetails = items.Where(t => t.Transaction.SpendingDetails != null).ToList();
// Represents a sublist of transactions associated with receive addresses + a sublist of already spent transactions associated with change addresses.
// In effect, we filter out 'change' transactions that are not spent, as we don't want to show these in the history.
List <FlatHistory> history = items.Where(t => !t.Address.IsChangeAddress() || (t.Address.IsChangeAddress() && t.Transaction.IsSpent())).ToList();
// Represents a sublist of 'change' transactions.
List <FlatHistory> allchange = items.Where(t => t.Address.IsChangeAddress()).ToList();
foreach (FlatHistory item in history)
{
// Count only unique transactions and limit it to MaxHistoryItemsPerAccount.
int processedTransactions = uniqueProcessedTxIds.Count;
if (processedTransactions >= WalletController.MaxHistoryItemsPerAccount)
{
break;
}
TransactionOutputData transaction = item.Transaction;
HdAddress address = item.Address;
// First we look for staking transaction as they require special attention.
// A staking transaction spends one of our inputs into 2 outputs or more, paid to the same address.
if (transaction.SpendingDetails?.IsCoinStake != null && transaction.SpendingDetails.IsCoinStake.Value)
{
// We look for the output(s) related to our spending input.
List <FlatHistory> relatedOutputs = items.Where(h => h.Transaction.Id == transaction.SpendingDetails.TransactionId && h.Transaction.IsCoinStake != null && h.Transaction.IsCoinStake.Value).ToList();
if (relatedOutputs.Any())
{
// Add staking transaction details.
// The staked amount is calculated as the difference between the sum of the outputs and the input and should normally be equal to 1.
var stakingItem = new TransactionItemModel
{
Type = TransactionItemType.Staked,
ToAddress = address.Address,
Amount = relatedOutputs.Sum(o => o.Transaction.Amount) - transaction.Amount,
Id = transaction.SpendingDetails.TransactionId,
Timestamp = transaction.SpendingDetails.CreationTime,
ConfirmedInBlock = transaction.SpendingDetails.BlockHeight,
BlockIndex = transaction.SpendingDetails.BlockIndex
};
transactionItems.Add(stakingItem);
uniqueProcessedTxIds.Add(stakingItem.Id);
}
// No need for further processing if the transaction itself is the output of a staking transaction.
if (transaction.IsCoinStake != null)
{
continue;
}
}
// If this is a normal transaction (not staking) that has been spent, add outgoing fund transaction details.
if (transaction.SpendingDetails != null && transaction.SpendingDetails.IsCoinStake == null)
{
// Create a record for a 'send' transaction.
uint256 spendingTransactionId = transaction.SpendingDetails.TransactionId;
var sentItem = new TransactionItemModel
{
Type = TransactionItemType.Send,
Id = spendingTransactionId,
Timestamp = transaction.SpendingDetails.CreationTime,
ConfirmedInBlock = transaction.SpendingDetails.BlockHeight,
BlockIndex = transaction.SpendingDetails.BlockIndex,
Amount = Money.Zero
};
// If this 'send' transaction has made some external payments, i.e the funds were not sent to another address in the wallet.
if (transaction.SpendingDetails.Payments != null)
{
sentItem.Payments = new List <PaymentDetailModel>();
foreach (PaymentDetails payment in transaction.SpendingDetails.Payments)
{
sentItem.Payments.Add(new PaymentDetailModel
{
DestinationAddress = payment.DestinationAddress,
Amount = payment.Amount
});
sentItem.Amount += payment.Amount;
}
}
// Get the change address for this spending transaction.
FlatHistory changeAddress = allchange.FirstOrDefault(a => a.Transaction.Id == spendingTransactionId);
// Find all the spending details containing the spending transaction id and aggregate the sums.
// This is our best shot at finding the total value of inputs for this transaction.
var inputsAmount = new Money(spendingDetails.Where(t => t.Transaction.SpendingDetails.TransactionId == spendingTransactionId).Sum(t => t.Transaction.Amount));
// The fee is calculated as follows: funds in utxo - amount spent - amount sent as change.
sentItem.Fee = inputsAmount - sentItem.Amount - (changeAddress == null ? 0 : changeAddress.Transaction.Amount);
// Mined/staked coins add more coins to the total out.
// That makes the fee negative. If that's the case ignore the fee.
if (sentItem.Fee < 0)
{
sentItem.Fee = 0;
}
transactionItems.Add(sentItem);
uniqueProcessedTxIds.Add(sentItem.Id);
}
// We don't show in history transactions that are outputs of staking transactions.
if (transaction.IsCoinStake != null && transaction.IsCoinStake.Value && transaction.SpendingDetails == null)
{
continue;
}
// Create a record for a 'receive' transaction.
if (transaction.IsCoinStake == null && !address.IsChangeAddress())
{
// First check if we already have a similar transaction output, in which case we just sum up the amounts
TransactionItemModel existingReceivedItem = FindSimilarReceivedTransactionOutput(transactionItems, transaction);
if (existingReceivedItem == null)
{
// Add incoming fund transaction details.
var receivedItem = new TransactionItemModel
{
Type = TransactionItemType.Received,
ToAddress = address.Address,
Amount = transaction.Amount,
Id = transaction.Id,
Timestamp = transaction.CreationTime,
ConfirmedInBlock = transaction.BlockHeight,
BlockIndex = transaction.BlockIndex
};
transactionItems.Add(receivedItem);
uniqueProcessedTxIds.Add(receivedItem.Id);
}
else
{
existingReceivedItem.Amount += transaction.Amount;
}
}
}
transactionItems = transactionItems.Distinct(new SentTransactionItemModelComparer()).Select(e => e).ToList();
// Sort and filter the history items.
List <TransactionItemModel> itemsToInclude = transactionItems.OrderByDescending(t => t.Timestamp)
.Where(x => String.IsNullOrEmpty(request.SearchQuery) || (x.Id.ToString() == request.SearchQuery || x.ToAddress == request.SearchQuery || x.Payments.Any(p => p.DestinationAddress == request.SearchQuery)))
.Skip(request.Skip ?? 0)
.Take(request.Take ?? transactionItems.Count)
.ToList();
model.AccountsHistoryModel.Add(new AccountHistoryModel
{
TransactionsHistory = itemsToInclude,
Name = accountHistory.Account.Name,
CoinType = network.Consensus.CoinType,
HdPath = accountHistory.Account.HdPath
});
}
return(model);
}