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gossipd: random_peer() selector.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2019-10-08 11:40:24 +10:30
committed by neil saitug
parent 8a3abdd5ff
commit d75302deba
1 changed files with 19 additions and 8 deletions
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27
gossipd/gossipd.c
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@@ -846,19 +846,21 @@ static void gossip_disable_local_channels(struct daemon *daemon)
local_disable_chan(daemon->rstate, c);
}
/* 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)
static struct peer *random_peer(struct daemon *daemon,
bool (*check_peer)(const struct peer *peer))
{
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) {
u64 r;
if (!check_peer(i))
continue;
r = pseudorand_u64();
if (r <= target) {
best = i;
target = r;
}
@@ -866,6 +868,14 @@ static struct peer *random_peer_to_gossip(struct daemon *daemon)
return best;
}
/* Mutual recursion, so we pre-declare this. */
static void gossip_not_missing(struct daemon *daemon);
static bool peer_is_not_gossip_high(const struct peer *peer)
{
return peer->gossip_level != GOSSIP_HIGH;
}
/*~ We've found gossip is missing. */
static void gossip_missing(struct daemon *daemon)
{
@@ -874,7 +884,8 @@ static void gossip_missing(struct daemon *daemon)
/* 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);
struct peer *peer = random_peer(daemon,
peer_is_not_gossip_high);
if (!peer)
break;