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gossipd: adjust gossip filters if we discover we're missing gossip.

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We pick up to three random peers and ask them to gossip more.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2019-06-12 08:59:12 +09:30
parent 6830233d0b
commit 1e32b4ab29
2 changed files with 46 additions and 1 deletions
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1
CHANGELOG.md
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@@ -34,6 +34,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
- Plugins: a plugin can now set the category of a newly created RPC command. This possibility has been added to libplugin.c and pylightning.
- CLI: the human readable help is now more human and more readable : commands are sorted alphabetically and ordered by categories.
- JSON API: A new parameter is added to `fundchannel`, which now accepts an utxo array to use to fund the channel.
- Protocol: no longer ask for entire gossip flood from peers, unless we're missing gossip.
### Deprecated

46
gossipd/gossipd.c
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@@ -2006,11 +2006,43 @@ static void gossip_disable_local_channels(struct daemon *daemon)
/* Mutual recursion, so we pre-declare this. */
static void gossip_not_missing(struct daemon *daemon);
/* Pick a random peer which is not already GOSSIP_HIGH. */
static struct peer *random_peer_to_gossip(struct daemon *daemon)
{
u64 target = UINT64_MAX;
struct peer *best = NULL, *i;
/* Reservoir sampling */
list_for_each(&daemon->peers, i, list) {
u64 r = pseudorand_u64();
if (i->gossip_level != GOSSIP_HIGH && r <= target) {
best = i;
target = r;
}
}
return best;
}
/*~ We've found gossip is missing. */
static void gossip_missing(struct daemon *daemon)
{
if (!daemon->gossip_missing)
if (!daemon->gossip_missing) {
status_info("We seem to be missing gossip messages");
/* FIXME: we could use query_channel_range. */
/* Make some peers gossip harder. */
for (size_t i = 0; i < gossip_level_targets[GOSSIP_HIGH]; i++) {
struct peer *peer = random_peer_to_gossip(daemon);
if (!peer)
break;
status_info("%s: gossip harder!",
type_to_string(tmpctx, struct node_id,
&peer->id));
peer->gossip_level = GOSSIP_HIGH;
setup_gossip_range(peer);
}
}
tal_free(daemon->gossip_missing);
/* Check again in 10 minutes. */
@@ -2027,10 +2059,22 @@ static void gossip_not_missing(struct daemon *daemon)
if (list_empty(&daemon->peers))
gossip_missing(daemon);
else {
struct peer *peer;
daemon->gossip_missing = tal_free(daemon->gossip_missing);
status_info("We seem to be caught up on gossip messages");
/* Free any lagging/stale unknown scids. */
daemon->unknown_scids = tal_free(daemon->unknown_scids);
/* Reset peers we marked as HIGH */
list_for_each(&daemon->peers, peer, list) {
if (peer->gossip_level != GOSSIP_HIGH)
continue;
if (!peer->gossip_queries_feature)
continue;
peer->gossip_level = peer_gossip_level(daemon, true);
setup_gossip_range(peer);
}
}
}