public async Task PayInvoice(PaymentRequest invoice, long?amountMSat = null, CancellationToken ct = default)
{
var amount = invoice.AmountValue?.Value.MilliSatoshi ?? amountMSat;
if (amount is null)
{
throw new NRustLightningException($"You must specify payment amount if it is not included in invoice");
}
var n = _networkProvider.TryGetByInvoice(invoice);
if (n is null)
{
throw new NRustLightningException($"Unknown invoice prefix {invoice.PrefixValue}");
}
var peerMan = _peerManagerProvider.GetPeerManager(n);
var failureTcs = new TaskCompletionSource <Event>();
var successTcs = new TaskCompletionSource <Event>();
_eventAggregator.Subscribe <Event>(e =>
{
if (e is Event.PaymentFailed paymentFailed && paymentFailed.Item.PaymentHash.Equals(invoice.PaymentHash))
{
_logger.LogError($"Payment for invoice ({invoice}) failed");
failureTcs.SetResult(paymentFailed);
}
if (e is Event.PaymentSent paymentSent && paymentSent.Item.Hash.Equals(invoice.PaymentHash))
{
_logger.LogInformation($"Payment for invoice ({invoice}) succeed");
successTcs.SetResult(paymentSent);
}
});
peerMan.SendPayment(invoice.NodeIdValue.Item, invoice.PaymentHash, new List <RouteHint>(), LNMoney.MilliSatoshis(amount.Value), invoice.MinFinalCLTVExpiryDelta);
peerMan.ProcessEvents();
var cts = CancellationTokenSource.CreateLinkedTokenSource(ct);
cts.CancelAfter(TimeSpan.FromSeconds(_config.Value.PaymentTimeoutSec));
var delay = Task.Delay(TimeSpan.FromMilliseconds(-1), cts.Token);
var task = Task.WhenAny(failureTcs.Task, successTcs.Task);
await Task.WhenAny(task, delay);
if (cts.IsCancellationRequested)
{
throw new NRustLightningException($"Payment for {invoice} did not finish in {_config.Value.PaymentTimeoutSec} seconds");
}
var resultEvent = await await task;
if (resultEvent is Event.PaymentFailed paymentFailed)
{
if (paymentFailed.Item.RejectedByDest)
{
throw new NRustLightningException($"Failed to pay! rejected by destination");
}
throw new NRustLightningException($"Failed to pay!");
}
if (resultEvent is Event.PaymentSent paymentSent)
{
await _invoiceRepository.SetPreimage(paymentSent.Item);
}
}
public async Task PayInvoice(PaymentRequest invoice, long?amountMSat = null, CancellationToken ct = default)
{
var amount = invoice.AmountValue?.Value.MilliSatoshi ?? amountMSat;
if (amount is null)
{
throw new NRustLightningException($"You must specify payment amount if it is not included in invoice");
}
var n = _networkProvider.TryGetByInvoice(invoice);
if (n is null)
{
throw new NRustLightningException($"Unknown invoice prefix {invoice.PrefixValue}");
}
var peerMan = _peerManagerProvider.GetPeerManager(n);
var failureTcs = new TaskCompletionSource <Event>(TaskCreationOptions.RunContinuationsAsynchronously);
var successTcs = new TaskCompletionSource <Event>(TaskCreationOptions.RunContinuationsAsynchronously);
_eventAggregator.Subscribe <Event>(e =>
{
if (e is Event.PaymentFailed paymentF && paymentF.Item.PaymentHash.Equals(invoice.PaymentHash))
{
_logger.LogError($"Payment for invoice ({invoice}) failed");
failureTcs.SetResult(paymentF);
}
if (e is Event.PaymentSent paymentS && paymentS.Item.Hash.Equals(invoice.PaymentHash))
{
_logger.LogInformation($"Payment for invoice ({invoice}) succeed");
successTcs.SetResult(paymentS);
}
});
peerMan.SendPayment(invoice.NodeIdValue.Item, invoice.PaymentHash, new List <RouteHint>(), LNMoney.MilliSatoshis(amount.Value), invoice.MinFinalCLTVExpiryDelta, _pool, invoice.PaymentSecret.Value);
peerMan.ProcessEvents();
// case 1: canceled by user.
var cancelTcs = new TaskCompletionSource <object>(TaskCreationOptions.RunContinuationsAsynchronously);
await using var _ = (ct.Register(state => { ((TaskCompletionSource <object>)state).TrySetResult(null); },
cancelTcs));
var cancelTask = cancelTcs.Task;
// case 2: timeout.
using var cts = new CancellationTokenSource();
var timeoutTask = Task.Delay(TimeSpan.FromSeconds(_config.Value.PaymentTimeoutSec), cts.Token);
// case 3: finishes
var task = Task.WhenAny(failureTcs.Task, successTcs.Task);
var resultTask = await Task.WhenAny(cancelTask, timeoutTask, task);
if (resultTask == cancelTask)
{
throw new NRustLightningException($"Payment canceled.");
}
if (resultTask == timeoutTask)
{
throw new NRustLightningException($"Payment for {invoice} did not finish in {_config.Value.PaymentTimeoutSec} seconds");
}
cts.Cancel(); // cancel the timer task so it does not fire.
var resultEvent = await await task;
if (resultEvent is Event.PaymentFailed paymentFailed)
{
if (paymentFailed.Item.RejectedByDest)
{
throw new NRustLightningException($"Failed to pay! rejected by destination");
}
throw new NRustLightningException($"Failed to pay!");
}
if (resultEvent is Event.PaymentSent paymentSent)
{
await _repository.SetPreimage(paymentSent.Item, ct);
}
}