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gossipd: exclude early blocks from random probes.

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When probing, no point probing for before lightning became cool.  Current
logic means we often probe below block 500,000, and think things are OK
because there are no short_channel_ids.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2019-10-18 20:40:50 +10:30 • committed by neil saitug
parent be49a599bc
commit 79df507442
1 changed files with 13 additions and 3 deletions
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16
gossipd/seeker.c
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@ -717,13 +717,23 @@ static void peer_gossip_probe_scids(struct seeker *seeker)
static void probe_random_scids(struct seeker *seeker, size_t num_blocks)
{
if (seeker->daemon->current_blockheight < num_blocks) {
u32 avail_blocks;
/* Ignore early blocks (unless we're before, which would be weird) */
if (seeker->daemon->current_blockheight
< chainparams->when_lightning_became_cool)
avail_blocks = seeker->daemon->current_blockheight;
else
avail_blocks = seeker->daemon->current_blockheight
- chainparams->when_lightning_became_cool;
if (avail_blocks < num_blocks) {
seeker->scid_probe_start = 0;
seeker->scid_probe_end = seeker->daemon->current_blockheight;
} else {
seeker->scid_probe_start
= pseudorand(seeker->daemon->current_blockheight
- num_blocks);
= chainparams->when_lightning_became_cool
+ pseudorand(avail_blocks - num_blocks);
seeker->scid_probe_end
= seeker->scid_probe_start + num_blocks - 1;
}