mirror of
https://github.com/callebtc/electronwall.git
synced 2025-12-17 15:14:25 +01:00
257 lines
8.3 KiB
Go
257 lines
8.3 KiB
Go
package main
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import (
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"context"
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"encoding/hex"
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"fmt"
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"strings"
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"sync"
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"github.com/lightningnetwork/lnd/lnrpc/routerrpc"
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log "github.com/sirupsen/logrus"
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)
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// DispatchHTLCAcceptor is the HTLC acceptor event loop
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func (app *App) DispatchHTLCAcceptor(ctx context.Context) {
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go func() {
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err := app.logHtlcEvents(ctx)
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if err != nil {
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log.Error("htlc event logger error",
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"err", err)
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}
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}()
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go func() {
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err := app.interceptHtlcEvents(ctx)
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if err != nil {
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log.Error("htlc interceptor error",
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"err", err)
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}
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// release wait group for htlc interceptor
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ctx.Value(ctxKeyWaitGroup).(*sync.WaitGroup).Done()
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}()
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log.Info("[forward] Listening for incoming HTLCs")
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}
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// interceptHtlcEvents intercepts incoming htlc events
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func (app *App) interceptHtlcEvents(ctx context.Context) error {
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// interceptor, decide whether to accept or reject
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interceptor, err := app.lnd.htlcInterceptor(ctx)
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if err != nil {
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return err
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}
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for {
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event, err := interceptor.Recv()
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if err != nil {
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return err
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}
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go func() {
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// decision for routing
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decision_chan := make(chan bool, 1)
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go app.htlcInterceptDecision(ctx, event, decision_chan)
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channelEdge, err := app.lnd.getPubKeyFromChannel(ctx, event.IncomingCircuitKey.ChanId)
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if err != nil {
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log.Errorf("[forward] Error getting pubkey for channel %s", ParseChannelID(event.IncomingCircuitKey.ChanId))
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}
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var pubkeyFrom, aliasFrom, pubkeyTo, aliasTo string
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if channelEdge.Node1Pub != app.myInfo.IdentityPubkey {
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pubkeyFrom = channelEdge.Node1Pub
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} else {
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pubkeyFrom = channelEdge.Node2Pub
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}
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aliasFrom, err = app.lnd.getNodeAlias(ctx, pubkeyFrom)
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if err != nil {
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aliasFrom = trimPubKey([]byte(pubkeyFrom))
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log.Errorf("[forward] Error getting alias for node %s", aliasFrom)
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}
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// we need to figure out which side of the channel is the other end
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channelEdgeTo, err := app.lnd.getPubKeyFromChannel(ctx, event.OutgoingRequestedChanId)
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if err != nil {
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log.Errorf("[forward] Error getting pubkey for channel %s", ParseChannelID(event.OutgoingRequestedChanId))
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}
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if channelEdgeTo.Node1Pub != app.myInfo.IdentityPubkey {
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pubkeyTo = channelEdgeTo.Node1Pub
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} else {
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pubkeyTo = channelEdgeTo.Node2Pub
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}
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aliasTo, err = app.lnd.getNodeAlias(ctx, pubkeyTo)
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if err != nil {
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aliasTo = trimPubKey([]byte(pubkeyTo))
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log.Errorf("[forward] Error getting alias for node %s", aliasTo)
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}
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log.Tracef("[forward] HTLC event (%d->%d)", event.IncomingCircuitKey.ChanId, event.OutgoingRequestedChanId)
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forward_info_string := fmt.Sprintf(
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"from %s to %s (%d sat, chan_id:%s->%s, htlc_id:%d)",
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aliasFrom,
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aliasTo,
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event.IncomingAmountMsat/1000,
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ParseChannelID(event.IncomingCircuitKey.ChanId),
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ParseChannelID(event.OutgoingRequestedChanId),
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event.IncomingCircuitKey.HtlcId,
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)
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response := &routerrpc.ForwardHtlcInterceptResponse{
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IncomingCircuitKey: event.IncomingCircuitKey,
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}
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contextLogger := log.WithFields(log.Fields{
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"event": "forward_request",
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"in_alias": aliasFrom,
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"out_alias": aliasTo,
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"amount": event.IncomingAmountMsat / 1000,
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"in_chan_id": ParseChannelID(event.IncomingCircuitKey.ChanId),
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"out_chan_id": ParseChannelID(event.OutgoingRequestedChanId),
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"htlc_id": event.IncomingCircuitKey.HtlcId,
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})
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if <-decision_chan {
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if Configuration.LogJson {
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contextLogger.Infof("allow")
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} else {
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log.Infof("[forward] ✅ Allow HTLC %s", forward_info_string)
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}
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response.Action = routerrpc.ResolveHoldForwardAction_RESUME
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} else {
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if Configuration.LogJson {
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contextLogger.Infof("deny")
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} else {
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log.Infof("[forward] ❌ Deny HTLC %s", forward_info_string)
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}
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response.Action = routerrpc.ResolveHoldForwardAction_FAIL
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}
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err = interceptor.Send(response)
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if err != nil {
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return
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}
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}()
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}
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}
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// htlcInterceptDecision implements the rules upon which the
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// decision is made whether or not to relay an HTLC to the next
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// peer.
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// The decision is made based on the following rules:
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// 1. Either use a allowlist or a denylist.
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// 2. If a single channel ID is used (12320768x65536x0), check the incoming ID of the HTLC against the list.
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// 3. If two channel IDs are used (7929856x65537x0->7143424x65537x0), check the incoming ID and the outgoing ID of the HTLC against the list.
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func (app *App) htlcInterceptDecision(ctx context.Context, event *routerrpc.ForwardHtlcInterceptRequest, decision_chan chan bool) {
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var accept bool
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var listToParse []string
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// // sleep for 60 seconds
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// time.Sleep(60 * time.Second)
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// determine filtering mode and list to parse
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switch Configuration.ForwardMode {
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case "allowlist":
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accept = false
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listToParse = Configuration.ForwardAllowlist
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case "denylist":
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accept = true
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listToParse = Configuration.ForwardDenylist
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default:
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err := fmt.Errorf("unknown forward mode: %s", Configuration.ForwardMode)
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panic(err)
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}
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// parse list and decide
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for _, forward_list_entry := range listToParse {
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if forward_list_entry == "*" {
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accept = !accept
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break
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}
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if len(strings.Split(forward_list_entry, "->")) == 2 {
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// check if entry is a pair of from->to
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split := strings.Split(forward_list_entry, "->")
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from_channel_id, to_channel_id := split[0], split[1]
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if (ParseChannelID(event.IncomingCircuitKey.ChanId) == from_channel_id || from_channel_id == "*") &&
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(ParseChannelID(event.OutgoingRequestedChanId) == to_channel_id || to_channel_id == "*") {
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accept = !accept
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log.Tracef("[test] Incoming: %s <-> %s, Outgoing: %s <-> %s", ParseChannelID(event.IncomingCircuitKey.ChanId), from_channel_id, ParseChannelID(event.OutgoingRequestedChanId), to_channel_id)
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break
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}
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} else {
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// single entry
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if ParseChannelID(event.IncomingCircuitKey.ChanId) == forward_list_entry {
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accept = !accept
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break
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}
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}
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}
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decision_chan <- accept
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}
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// logHtlcEvents reports on incoming htlc events
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func (app *App) logHtlcEvents(ctx context.Context) error {
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// htlc event subscriber, reports on incoming htlc events
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stream, err := app.lnd.subscribeHtlcEvents(ctx, &routerrpc.SubscribeHtlcEventsRequest{})
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if err != nil {
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return err
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}
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for {
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event, err := stream.Recv()
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if err != nil {
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return err
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}
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// we only care about HTLC forward events
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if event.EventType != routerrpc.HtlcEvent_FORWARD {
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continue
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}
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contextLogger := log.WithFields(log.Fields{
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"event": "forward_event",
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"chan_id": ParseChannelID(event.IncomingChannelId),
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"htlc_id": event.IncomingHtlcId,
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})
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switch event.Event.(type) {
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case *routerrpc.HtlcEvent_SettleEvent:
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if Configuration.LogJson {
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contextLogger.Infof("SettleEvent")
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// contextLogger.Debugf("[forward] Preimage: %s", hex.EncodeToString(event.GetSettleEvent().Preimage))
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} else {
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log.Infof("[forward] ⚡️ HTLC SettleEvent (chan_id:%s, htlc_id:%d)", ParseChannelID(event.IncomingChannelId), event.IncomingHtlcId)
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if event.GetSettleEvent() != nil && event.GetSettleEvent().Preimage != nil {
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log.Debugf("[forward] Preimage: %s", hex.EncodeToString(event.GetSettleEvent().Preimage))
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}
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}
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case *routerrpc.HtlcEvent_ForwardFailEvent:
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if Configuration.LogJson {
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contextLogger.Infof("ForwardFailEvent")
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// contextLogger.Debugf("[forward] Reason: %s", event.GetForwardFailEvent())
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} else {
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log.Infof("[forward] HTLC ForwardFailEvent (chan_id:%s, htlc_id:%d)", ParseChannelID(event.IncomingChannelId), event.IncomingHtlcId)
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// log.Debugf("[forward] Reason: %s", event.GetForwardFailEvent().String())
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}
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case *routerrpc.HtlcEvent_ForwardEvent:
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if Configuration.LogJson {
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contextLogger.Infof("ForwardEvent")
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} else {
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log.Infof("[forward] HTLC ForwardEvent (chan_id:%s, htlc_id:%d)", ParseChannelID(event.IncomingChannelId), event.IncomingHtlcId)
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}
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// log.Infof("[forward] HTLC ForwardEvent (chan_id:%s, htlc_id:%d)", ParseChannelID(event.IncomingChannelId), event.IncomingHtlcId)
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// log.Debugf("[forward] Details: %s", event.GetForwardEvent().String())
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case *routerrpc.HtlcEvent_LinkFailEvent:
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if Configuration.LogJson {
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contextLogger.Infof("LinkFailEvent")
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contextLogger.Debugf("[forward] Reason: %s", event.GetLinkFailEvent().FailureString)
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} else {
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log.Infof("[forward] HTLC LinkFailEvent (chan_id:%s, htlc_id:%d)", ParseChannelID(event.IncomingChannelId), event.IncomingHtlcId)
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log.Debugf("[forward] Reason: %s", event.GetLinkFailEvent().FailureString)
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}
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}
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}
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}
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