private async Task <(DataDeliveryReceipt, RequestReceiptStatus)> TryHandleDeliveryReceipt(IDepositNodesHandler deposit,
Address consumer, ProviderSession session, DataDeliveryReceiptRequest request, INdmProviderPeer peer,
bool isRetry = false)
{
while (true)
{
Keccak depositId = session.DepositId;
DataDeliveryReceipt receipt = await peer.SendRequestDataDeliveryReceiptAsync(request, CancellationToken.None);
if (_logger.IsInfo)
{
_logger.Info($"Received a delivery receipt for deposit: '{depositId}' from node: '{peer.NodeId}', status code: '{receipt.StatusCode}'.");
}
if (isRetry && receipt.StatusCode != StatusCodes.Ok)
{
if (_logger.IsWarn)
{
_logger.Warn($"Request receipt retry failed for: '{depositId}' from node: '{peer.NodeId}', status code: '{receipt.StatusCode}'.");
}
return(receipt, RequestReceiptStatus.Invalid);
}
switch (receipt.StatusCode)
{
case StatusCodes.Ok:
if (await _receiptProcessor.TryProcessAsync(session, consumer, peer, request, receipt))
{
return(receipt, RequestReceiptStatus.Ok);
}
return(receipt, RequestReceiptStatus.Invalid);
case StatusCodes.InvalidReceiptRequestRange:
{
if (_logger.IsInfo)
{
_logger.Info($"Consumer for deposit: '{depositId}' from node: '{peer.NodeId}' claims {receipt.ConsumedUnits} consumed and {receipt.UnpaidUnits} unpaid units.");
}
UnitsRange range = request.UnitsRange;
uint requestedUnits = range.To - range.From + 1;
if (requestedUnits <= receipt.UnpaidUnits)
{
if (_logger.IsWarn)
{
_logger.Warn($"Consumer for deposit: '{depositId}' from node: '{peer.NodeId}' claimed an invalid range (while it was actually valid).");
}
break;
}
uint graceUnits = requestedUnits - receipt.UnpaidUnits;
uint totalGraceUnits = graceUnits + deposit.GraceUnits;
bool hasReachedThreshold = await _receiptsPolicies.CanClaimPayment(totalGraceUnits, deposit.UnitPrice);
if (hasReachedThreshold)
{
peer.SendGraceUnitsExceeded(depositId, deposit.ConsumedUnits, totalGraceUnits);
if (_logger.IsWarn)
{
_logger.Warn($"Consumer for deposit: '{depositId}' from node: '{peer.NodeId}' claimed too many unpaid units, grace units exceeded ({totalGraceUnits}).");
}
return(receipt, RequestReceiptStatus.GraceUnitsExceeded);
}
if (_logger.IsInfo)
{
_logger.Info($"Unpaid units difference is: {graceUnits} ({requestedUnits} - {receipt.UnpaidUnits}). Lowering units amount for deposit: '{depositId}'.");
}
deposit.SubtractUnpaidUnits(graceUnits);
deposit.SubtractUnmergedUnits(graceUnits);
deposit.SubtractUnclaimedUnits(graceUnits);
deposit.AddGraceUnits(graceUnits);
session.SubtractUnpaidUnits(graceUnits);
session.AddGraceUnits(graceUnits);
if (range.To < graceUnits)
{
peer.SendGraceUnitsExceeded(depositId, deposit.ConsumedUnits, totalGraceUnits);
if (_logger.IsWarn)
{
_logger.Warn($"Cannot request a receipt for deposit: '{depositId}' - grace units amount is greater than the receipt range ({graceUnits} > {range.To}).");
}
return(receipt, RequestReceiptStatus.GraceUnitsExceeded);
}
uint updatedRangeTo = range.To - graceUnits;
if (range.From > updatedRangeTo)
{
if (_logger.IsWarn)
{
_logger.Warn($"Invalid updated range [{range.From}, {updatedRangeTo}] for: '{depositId}' - receipt request will not be send.");
}
return(receipt, RequestReceiptStatus.Invalid);
}
if (_logger.IsInfo)
{
_logger.Info($"Grace units for deposit: '{depositId}' is: {deposit.GraceUnits} (added {graceUnits}).");
}
UnitsRange updatedRange = new UnitsRange(range.From, updatedRangeTo);
if (_logger.IsInfo)
{
_logger.Info($"Updated range for deposit: '{depositId}' [{updatedRange.From}, {updatedRange.To}]. Requesting receipt once again.");
}
request = request.WithRange(updatedRange, deposit.GetNextReceiptRequestNumber());
isRetry = true;
continue;
}
case StatusCodes.InvalidReceiptAddress:
{
break;
}
case StatusCodes.Error:
{
break;
}
}
return(receipt, RequestReceiptStatus.Invalid);
}
}
private DataDeliveryReceiptRequest?CreateMergedRequest(IDepositNodesHandler deposit)
{
if (deposit.LatestReceipt == null)
{
return(null);
}
if (_logger.IsInfo)
{
_logger.Info($"Creating merged receipt request for deposit: '{deposit.DepositId}'.");
}
bool isLastReceipt = deposit.LatestReceipt.Request.UnitsRange.To == deposit.PurchasedUnits - 1;
if (isLastReceipt && _logger.IsInfo)
{
_logger.Info($"Merged receipt request for deposit: '{deposit.DepositId}' will be the last one.");
}
uint latestPaymentClaimRangeTo = deposit.LatestPaymentClaim?.UnitsRange.To ?? 0;
DataDeliveryReceiptDetails?latestMergedReceipt = deposit.Receipts.OrderBy(r => r.Timestamp)
.ThenBy(r => r.Request.UnitsRange.To)
.LastOrDefault(r => r.IsMerged);
uint latestMergedReceiptRangeFrom = latestMergedReceipt?.Request.UnitsRange.From ?? 0;
long latestMergedReceiptRangeTo = latestMergedReceipt?.Request.UnitsRange.To ?? 0;
var mergeableReceipts = deposit.Receipts
.Where(r => r.Timestamp >= (latestMergedReceipt?.Timestamp ?? 0) &&
r.Request.UnitsRange.To >
(latestMergedReceipt is null ? -1 : latestMergedReceiptRangeTo))
.OrderBy(r => r.Timestamp)
.ThenBy(r => r.Request.UnitsRange.To)
.ToList();
var paymentClaimExist = deposit.LatestPaymentClaim is { };
uint rangeFrom;
if (paymentClaimExist)
{
rangeFrom = latestPaymentClaimRangeTo + 1;
}
else
{
if (latestMergedReceiptRangeFrom > 0)
{
rangeFrom = latestMergedReceiptRangeFrom + 1;
}
else
{
rangeFrom = 0;
}
}
uint rangeTo = deposit.LatestReceipt.Request.UnitsRange.To;
if (rangeFrom > rangeTo)
{
return(null);
}
if (!(latestMergedReceipt is null))
{
mergeableReceipts.Insert(0, latestMergedReceipt);
}
UnitsRange unitsRange = new UnitsRange(rangeFrom, rangeTo);
var receiptsToMerge = mergeableReceipts.Select(r => new DataDeliveryReceiptToMerge(
r.Request.UnitsRange, r.Receipt.Signature)).OrderBy(r => r.UnitsRange.To).ToList();
uint number = deposit.GetNextReceiptRequestNumber();
if (_logger.IsInfo)
{
_logger.Info($"Created merged receipt request for deposit: '{deposit.DepositId}' [{rangeFrom}, {rangeTo}].");
}
return(new DataDeliveryReceiptRequest(number, deposit.DepositId, unitsRange,
receiptsToMerge: receiptsToMerge));
}