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common: make gossmap ignore redundant channel_announcements.

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This seems to be happening to some people, so don't panic.  Unfortunately we don't have
a good error callback here, so msg to stderr.

Fixes: https://github.com/ElementsProject/lightning/issues/7249
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2024-05-23 10:56:59 +09:30 • committed by Vincenzo Palazzo
parent 744116e501
commit 6b91497223
1 changed files with 9 additions and 2 deletions
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11
common/gossmap.c
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@ -458,9 +458,16 @@ static struct gossmap_chan *add_channel(struct gossmap *map,
map_nodeid(map, cannounce_off + plus_scid_off + 8, &node_id[0]);
map_nodeid(map, cannounce_off + plus_scid_off + 8 + PUBKEY_CMPR_LEN, &node_id[1]);
/* We 1should not get duplicates. */
/* We should not get duplicates. */
scid.u64 = map_be64(map, cannounce_off + plus_scid_off);
assert(!gossmap_find_chan(map, &scid));
chan = gossmap_find_chan(map, &scid);
if (chan) {
/* FIXME: Report this better! */
warnx("gossmap: redundant channel_announce for %s, offsets %u and %zu!",
fmt_short_channel_id(tmpctx, scid),
chan->cann_off, cannounce_off);
return NULL;
}
/* We carefully map pointers to indexes, since new_node can move them! */
n[0] = gossmap_find_node(map, &node_id[0]);