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feat: fire channel open and closure events in lnd #849

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merged 2 commits into from
Dec 17, 2024
Merged

feat: fire channel open and closure events in lnd #849

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7273cc2
feat: fire channel closure events in lnd
im-adithya Dec 5, 2024
8d38433
feat: fire channel open events in lnd
im-adithya Dec 10, 2024
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277 changes: 179 additions & 98 deletions lnclient/lnd/lnd.go
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@ import (
decodepay "github.com/nbd-wtf/ln-decodepay"
"google.golang.org/grpc/status"

"github.com/getAlby/hub/config"
"github.com/getAlby/hub/events"
"github.com/getAlby/hub/lnclient"
"github.com/getAlby/hub/lnclient/lnd/wrapper"
Expand All @@ -31,9 +32,10 @@ import (
)

type LNDService struct {
client *wrapper.LNDWrapper
nodeInfo *lnclient.NodeInfo
cancel context.CancelFunc
client *wrapper.LNDWrapper
nodeInfo *lnclient.NodeInfo
cancel context.CancelFunc
eventPublisher events.EventPublisher
}

// FIXME: this always returns limit * 2 transactions and offset is not used correctly
Expand Down Expand Up @@ -442,128 +444,207 @@ func NewLNDService(ctx context.Context, eventPublisher events.EventPublisher, ln

lndCtx, cancel := context.WithCancel(ctx)

lndService := &LNDService{client: lndClient, nodeInfo: nodeInfo, cancel: cancel}

// Subscribe to payments
go func() {
for {
select {
case <-lndCtx.Done():
return
default:
paymentStream, err := lndClient.SubscribePayments(lndCtx, &routerrpc.TrackPaymentsRequest{
NoInflightUpdates: true,
})
lndService := &LNDService{
client: lndClient,
nodeInfo: nodeInfo,
cancel: cancel,
eventPublisher: eventPublisher,
}

go lndService.subscribePayments(lndCtx)
go lndService.subscribeInvoices(lndCtx)
go lndService.subscribeChannelEvents(lndCtx)

logger.Logger.Infof("Connected to LND - alias %s", nodeInfo.Alias)

return lndService, nil
}

func (svc *LNDService) subscribePayments(ctx context.Context) {
for {
select {
case <-ctx.Done():
return
default:
paymentStream, err := svc.client.SubscribePayments(ctx, &routerrpc.TrackPaymentsRequest{
NoInflightUpdates: true,
})
if err != nil {
logger.Logger.WithError(err).Error("Error subscribing to payments")
select {
case <-ctx.Done():
return
case <-time.After(10 * time.Second):
continue
}
}
paymentsLoop:
for {
payment, err := paymentStream.Recv()
if err != nil {
logger.Logger.WithError(err).Error("Error subscribing to payments")
logger.Logger.WithError(err).Error("Failed to receive payment")
select {
case <-lndCtx.Done():
case <-ctx.Done():
return
case <-time.After(10 * time.Second):
continue
case <-time.After(2 * time.Second):
break paymentsLoop
}
}
paymentsLoop:
for {
payment, err := paymentStream.Recv()

switch payment.Status {
case lnrpc.Payment_FAILED:
logger.Logger.WithFields(logrus.Fields{
"payment": payment,
}).Info("Received payment failed notification")

transaction, err := lndPaymentToTransaction(payment)
if err != nil {
logger.Logger.WithError(err).Error("Failed to receive payment")
select {
case <-lndCtx.Done():
return
case <-time.After(2 * time.Second):
break paymentsLoop
}
continue
}
svc.eventPublisher.Publish(&events.Event{
Event: "nwc_lnclient_payment_failed",
Properties: &lnclient.PaymentFailedEventProperties{
Transaction: transaction,
Reason: payment.FailureReason.String(),
},
})
case lnrpc.Payment_SUCCEEDED:
logger.Logger.WithFields(logrus.Fields{
"payment": payment,
}).Info("Received payment sent notification")

switch payment.Status {
case lnrpc.Payment_FAILED:
logger.Logger.WithFields(logrus.Fields{
"payment": payment,
}).Info("Received payment failed notification")

transaction, err := lndPaymentToTransaction(payment)
if err != nil {
continue
}
eventPublisher.Publish(&events.Event{
Event: "nwc_lnclient_payment_failed",
Properties: &lnclient.PaymentFailedEventProperties{
Transaction: transaction,
Reason: payment.FailureReason.String(),
},
})
case lnrpc.Payment_SUCCEEDED:
logger.Logger.WithFields(logrus.Fields{
"payment": payment,
}).Info("Received payment sent notification")

transaction, err := lndPaymentToTransaction(payment)
if err != nil {
continue
}
eventPublisher.Publish(&events.Event{
Event: "nwc_lnclient_payment_sent",
Properties: transaction,
})
default:
transaction, err := lndPaymentToTransaction(payment)
if err != nil {
continue
}
svc.eventPublisher.Publish(&events.Event{
Event: "nwc_lnclient_payment_sent",
Properties: transaction,
})
default:
continue
}
}
}
}()

// Subscribe to invoices
go func() {
for {
select {
case <-lndCtx.Done():
return
default:
invoiceStream, err := lndClient.SubscribeInvoices(lndCtx, &lnrpc.InvoiceSubscription{})
}
}

func (svc *LNDService) subscribeInvoices(ctx context.Context) {
for {
select {
case <-ctx.Done():
return
default:
invoiceStream, err := svc.client.SubscribeInvoices(ctx, &lnrpc.InvoiceSubscription{})
if err != nil {
logger.Logger.WithError(err).Error("Error subscribing to invoices")
select {
case <-ctx.Done():
return
case <-time.After(10 * time.Second):
continue
}
}
invoicesLoop:
for {
invoice, err := invoiceStream.Recv()
if err != nil {
logger.Logger.WithError(err).Error("Error subscribing to invoices")
logger.Logger.WithError(err).Error("Failed to receive invoice")
select {
case <-lndCtx.Done():
case <-ctx.Done():
return
case <-time.After(10 * time.Second):
continue
case <-time.After(2 * time.Second):
break invoicesLoop
}
}
invoicesLoop:
for {
invoice, err := invoiceStream.Recv()
if err != nil {
logger.Logger.WithError(err).Error("Failed to receive invoice")
select {
case <-lndCtx.Done():
return
case <-time.After(2 * time.Second):
break invoicesLoop
}
}

if invoice.State != lnrpc.Invoice_SETTLED {
continue
if invoice.State != lnrpc.Invoice_SETTLED {
continue
}

logger.Logger.WithFields(logrus.Fields{
"invoice": invoice,
}).Info("Received new invoice")

svc.eventPublisher.Publish(&events.Event{
Event: "nwc_lnclient_payment_received",
Properties: lndInvoiceToTransaction(invoice),
})
}
}
}
}

func (svc *LNDService) subscribeChannelEvents(ctx context.Context) {
for {
select {
case <-ctx.Done():
return
default:
channelEvents, err := svc.client.SubscribeChannelEvents(ctx, &lnrpc.ChannelEventSubscription{})
if err != nil {
logger.Logger.WithError(err).Error("Error subscribing to channel events")
select {
case <-ctx.Done():
return
case <-time.After(10 * time.Second):
continue
}
}
channelEventsLoop:
for {
event, err := channelEvents.Recv()
if err != nil {
logger.Logger.WithError(err).Error("Failed to receive channel event")
select {
case <-ctx.Done():
return
case <-time.After(2 * time.Second):
break channelEventsLoop
}
}

switch update := event.Channel.(type) {
case *lnrpc.ChannelEventUpdate_OpenChannel:
channel := update.OpenChannel
logger.Logger.WithFields(logrus.Fields{
"invoice": invoice,
}).Info("Received new invoice")
"counterparty_node_id": channel.RemotePubkey,
"public": !channel.Private,
"capacity": channel.Capacity,
"is_outbound": channel.Initiator,
}).Info("Channel opened")

svc.eventPublisher.Publish(&events.Event{
Event: "nwc_channel_ready",
Properties: map[string]interface{}{
"counterparty_node_id": channel.RemotePubkey,
"node_type": config.LNDBackendType,
"public": !channel.Private,
"capacity": channel.Capacity,
"is_outbound": channel.Initiator,
},
})
case *lnrpc.ChannelEventUpdate_ClosedChannel:
closureReason := update.ClosedChannel.CloseType.String()
counterpartyNodeId := update.ClosedChannel.RemotePubkey

eventPublisher.Publish(&events.Event{
Event: "nwc_lnclient_payment_received",
Properties: lndInvoiceToTransaction(invoice),
logger.Logger.WithFields(logrus.Fields{
"counterparty_node_id": counterpartyNodeId,
"reason": closureReason,
}).Info("Channel closed")

svc.eventPublisher.Publish(&events.Event{
Event: "nwc_channel_closed",
Properties: map[string]interface{}{
"counterparty_node_id": counterpartyNodeId,
"reason": closureReason,
"node_type": config.LNDBackendType,
},
})
}
}
}
}()

logger.Logger.Infof("Connected to LND - alias %s", nodeInfo.Alias)

return lndService, nil
}
}

func (svc *LNDService) Shutdown() error {
Expand Down
4 changes: 4 additions & 0 deletions lnclient/lnd/wrapper/lnd.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -218,3 +218,7 @@ func (wrapper *LNDWrapper) UpdateChannel(ctx context.Context, req *lnrpc.PolicyU
func (wrapper *LNDWrapper) DisconnectPeer(ctx context.Context, req *lnrpc.DisconnectPeerRequest, options ...grpc.CallOption) (*lnrpc.DisconnectPeerResponse, error) {
return wrapper.client.DisconnectPeer(ctx, req, options...)
}

func (wrapper *LNDWrapper) SubscribeChannelEvents(ctx context.Context, in *lnrpc.ChannelEventSubscription, options ...grpc.CallOption) (lnrpc.Lightning_SubscribeChannelEventsClient, error) {
return wrapper.client.SubscribeChannelEvents(ctx, in, options...)
}
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