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ld: Add a couple of logging statements when forwarding

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We were debugging a number of issues related to the forwarding logic,
when using public scids on private channels, and we noticed that we
are very verbose everywhere, except where it counts, i.e., what
decisions are being taken. So we add a couple of debug logs, and a
final info one that tells the operator which resolution was chosen in
the end.
This commit is contained in:
Christian Decker 2023-01-05 12:11:36 +01:00 • committed by Rusty Russell
parent 6d76642f7e
commit 650443e4d5
1 changed files with 35 additions and 3 deletions
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38
lightningd/peer_htlcs.c
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@ -1205,18 +1205,42 @@ static struct channel_id *calc_forwarding_channel(struct lightningd *ld,
return NULL;
if (p->forward_channel) {
log_debug(hp->channel->log,
"Looking up channel by scid=%s to forward htlc_id=%" PRIu64,
type_to_string(tmpctx, struct short_channel_id,
p->forward_channel),
hp->hin->key.id);
c = any_channel_by_scid(ld, p->forward_channel, false);
if (!c)
if (!c) {
log_unusual(hp->channel->log, "No peer channel with scid=%s",
type_to_string(tmpctx, struct short_channel_id,
p->forward_channel));
return NULL;
}
peer = c->peer;
} else {
struct node_id id;
if (!p->forward_node_id)
if (!p->forward_node_id) {
log_unusual(hp->channel->log,
"Neither forward_channel nor "
"forward_node_id was set in payload");
return NULL;
}
node_id_from_pubkey(&id, p->forward_node_id);
peer = peer_by_id(ld, &id);
if (!peer)
log_debug(hp->channel->log, "Looking up peer by node_id=%s",
type_to_string(tmpctx, struct node_id, &id));
if (!peer) {
log_unusual(
hp->channel->log, "No peer with node_id=%s",
type_to_string(tmpctx, struct node_id, &id));
return NULL;
}
c = NULL;
}
@ -1239,6 +1263,14 @@ static struct channel_id *calc_forwarding_channel(struct lightningd *ld,
channel_scid_or_local_alias(best)));
}
log_debug(hp->channel->log,
"Decided to forward htlc_id=%" PRIu64
" over channel with scid=%s with peer %s",
hp->hin->key.id,
type_to_string(tmpctx, struct short_channel_id,
channel_scid_or_local_alias(best)),
type_to_string(tmpctx, struct node_id, &best->peer->id));
return tal_dup(hp, struct channel_id, &best->cid);
}