public async Task SendAsync(DataDeliveryReceiptRequest request, int fetchSessionRetries = 3,
int fetchSessionRetryDelayMilliseconds = 3000)
{
var depositId = request.DepositId;
var(deposit, session) = await TryGetDepositAndSessionAsync(depositId,
fetchSessionRetries, fetchSessionRetryDelayMilliseconds);
if (deposit is null || session is null)
{
return;
}
var providerAddress = deposit.DataAsset.Provider.Address;
var providerPeer = _providerService.GetPeer(providerAddress);
if (providerPeer is null)
{
if (_logger.IsWarn)
{
_logger.Warn($"Provider: '{providerAddress}' was not found.");
}
return;
}
var receiptId = Keccak.Compute(Rlp.Encode(Rlp.Encode(depositId), Rlp.Encode(request.Number),
Rlp.Encode(_timestamper.EpochSeconds)));
if (!_receiptRequestValidator.IsValid(request, session.UnpaidUnits, session.ConsumedUnits,
deposit.Deposit.Units))
{
if (_logger.IsWarn)
{
_logger.Warn($"Provider: '{providerPeer.NodeId}' sent an invalid data delivery receipt request.");
}
var receipt = new DataDeliveryReceipt(StatusCodes.InvalidReceiptRequestRange,
session.ConsumedUnits, session.UnpaidUnits, new Signature(1, 1, 27));
await _receiptRepository.AddAsync(new DataDeliveryReceiptDetails(receiptId, session.Id,
session.DataAssetId, _nodePublicKey, request, receipt, _timestamper.EpochSeconds, false));
await _sessionRepository.UpdateAsync(session);
providerPeer.SendDataDeliveryReceipt(depositId, receipt);
return;
}
var abiHash = _abiEncoder.Encode(AbiEncodingStyle.Packed, _dataDeliveryReceiptAbiSig,
depositId.Bytes, new[] { request.UnitsRange.From, request.UnitsRange.To });
var receiptHash = Keccak.Compute(abiHash);
var signature = _wallet.Sign(receiptHash, deposit.Consumer);
var recoveredAddress = _ecdsa.RecoverPublicKey(signature, receiptHash)?.Address;
if (deposit.Consumer != recoveredAddress)
{
if (_logger.IsError)
{
_logger.Error($"Signature failure when signing the receipt from provider: '{providerPeer.NodeId}', invalid recovered address.");
}
var receipt = new DataDeliveryReceipt(StatusCodes.InvalidReceiptAddress,
session.ConsumedUnits, session.UnpaidUnits, new Signature(1, 1, 27));
await _receiptRepository.AddAsync(new DataDeliveryReceiptDetails(receiptId, session.Id,
session.DataAssetId, _nodePublicKey, request, receipt, _timestamper.EpochSeconds, false));
await _sessionRepository.UpdateAsync(session);
providerPeer.SendDataDeliveryReceipt(depositId, receipt);
return;
}
if (_logger.IsInfo)
{
_logger.Info($"Provider: '{providerPeer.NodeId}' sent a valid data delivery receipt request.");
}
if (request.ReceiptsToMerge.Any())
{
if (_logger.IsInfo)
{
_logger.Info($"Processing a merged receipt request for deposit: {session.DepositId}, session: '{session.Id} - units will not be updated.");
}
}
else
{
var paidUnits = request.UnitsRange.To - request.UnitsRange.From + 1;
var unpaidUnits = session.UnpaidUnits > paidUnits ? session.UnpaidUnits - paidUnits : 0;
session.SetUnpaidUnits(unpaidUnits);
session.AddPaidUnits(paidUnits);
if (request.IsSettlement)
{
session.SetPaidUnits(paidUnits);
session.SettleUnits(paidUnits);
if (_logger.IsInfo)
{
_logger.Info($"Settled {paidUnits} units for deposit: '{session.DepositId}', session: '{session.Id}'.");
}
}
await _sessionRepository.UpdateAsync(session);
}
if (_logger.IsInfo)
{
_logger.Info($"Sending data delivery receipt for deposit: '{depositId}', range: [{request.UnitsRange.From}, {request.UnitsRange.To}].");
}
var deliveryReceipt = new DataDeliveryReceipt(StatusCodes.Ok, session.ConsumedUnits,
session.UnpaidUnits, signature);
await _receiptRepository.AddAsync(new DataDeliveryReceiptDetails(receiptId, session.Id,
session.DataAssetId, _nodePublicKey, request, deliveryReceipt, _timestamper.EpochSeconds, false));
providerPeer.SendDataDeliveryReceipt(depositId, deliveryReceipt);
if (_logger.IsInfo)
{
_logger.Info($"Sent data delivery receipt for deposit: '{depositId}', range: [{request.UnitsRange.From}, {request.UnitsRange.To}].");
}
}
private async Task <DataDeliveryReceiptDetails?> TryHandleReceiptAsync(ProviderSession session, Address consumer,
INdmProviderPeer peer, DataDeliveryReceiptRequest request)
{
Keccak depositId = session.DepositId;
IDepositNodesHandler?deposit = GetDepositNodesHandler(depositId);
if (deposit == null)
{
throw new InvalidDataException($"Cannot resolve deposit handle for deposit ID: {depositId}");
}
try
{
UnitsRange unitsRange = request.UnitsRange;
if (_logger.IsInfo)
{
_logger.Info($"Sending data delivery receipt request ({request.Number}), deposit: '{depositId}', session: '{session.Id}', range: [{unitsRange.From}, {unitsRange.To}].");
}
if (request.ReceiptsToMerge.Any())
{
if (_logger.IsInfo)
{
_logger.Info($"Receipts to merge for deposit: '{depositId}': {string.Join(", ", request.ReceiptsToMerge.Select(r => $"[{r.UnitsRange.From}, {r.UnitsRange.To}]"))}");
}
}
(DataDeliveryReceipt receipt, RequestReceiptStatus status) = await TryHandleDeliveryReceipt(deposit, consumer, session, request, peer);
Keccak id = Keccak.Compute(Rlp.Encode(Rlp.Encode(depositId), Rlp.Encode(request.Number)).Bytes);
DataDeliveryReceiptDetails receiptDetails = new DataDeliveryReceiptDetails(id, session.Id, session.DataAssetId, peer.NodeId,
request, receipt, _timestamper.UnixTime.Seconds, false);
await _receiptRepository.AddAsync(receiptDetails);
if (status != RequestReceiptStatus.Ok)
{
return(null);
}
UnitsRange range = request.UnitsRange;
uint claimedUnits = range.To - range.From + 1;
deposit.AddReceipt(receiptDetails);
if (!request.ReceiptsToMerge.Any())
{
deposit.SubtractUnpaidUnits(claimedUnits);
}
if (_logger.IsInfo)
{
_logger.Info($"Successfully processed receipt ({claimedUnits} units) for deposit: '{depositId}' with node: '{peer.NodeId}'.");
}
return(receiptDetails);
}
catch (Exception ex)
{
if (_logger.IsWarn)
{
_logger.Warn($"There was an error when processing a receipt for deposit: '{depositId}'. {ex}");
}
session.SetDataAvailability(DataAvailability.DataDeliveryReceiptNotProvided);
await _sessionRepository.UpdateAsync(session);
peer.SendDataAvailability(depositId, DataAvailability.DataDeliveryReceiptInvalid);
return(null);
}
}