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connectd: optimize requests for "recent" gossip.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2022-07-15 15:29:26 +09:30
parent 62a5183fb5
commit 6fd8fa4d95
2 changed files with 38 additions and 3 deletions
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2
connectd/connectd.h
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@ -187,6 +187,8 @@ struct daemon {
/* The gossip_store */
int gossip_store_fd;
size_t gossip_store_end;
u32 gossip_recent_time;
size_t gossip_store_recent_off;
/* We only announce websocket addresses if !deprecated_apis */
bool announce_websocket;

39
connectd/multiplex.c
View file

@ -129,6 +129,26 @@ static struct oneshot *gossip_stream_timer(struct peer *peer)
wake_gossip, peer);
}
/* It's so common to ask for "recent" gossip (we ask for 10 minutes
* ago, LND and Eclair ask for now, LDK asks for 1 hour ago) that it's
* worth keeping track of where that starts, so we can skip most of
* the store. */
static void update_recent_timestamp(struct daemon *daemon)
{
/* 2 hours allows for some clock drift, not too much gossip */
u32 recent = time_now().ts.tv_sec - 7200;
/* Only update every minute */
if (daemon->gossip_recent_time + 60 > recent)
return;
daemon->gossip_recent_time = recent;
daemon->gossip_store_recent_off
= find_gossip_store_by_timestamp(daemon->gossip_store_fd,
daemon->gossip_store_recent_off,
daemon->gossip_recent_time);
}
/* This is called once we need it: otherwise, the gossip_store may not exist,
* since we start at the same time as gossipd itself. */
static void setup_gossip_store(struct daemon *daemon)
@ -138,10 +158,16 @@ static void setup_gossip_store(struct daemon *daemon)
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"Opening gossip_store %s: %s",
GOSSIP_STORE_FILENAME, strerror(errno));
daemon->gossip_recent_time = 0;
daemon->gossip_store_recent_off = 1;
update_recent_timestamp(daemon);
/* gossipd will be writing to this, and it's not atomic! Safest
* way to find the "end" is to walk through. */
daemon->gossip_store_end
= find_gossip_store_end(daemon->gossip_store_fd, 1);
= find_gossip_store_end(daemon->gossip_store_fd,
daemon->gossip_store_recent_off);
}
void setup_peer_gossip_store(struct peer *peer,
@ -636,8 +662,15 @@ static void handle_gossip_timestamp_filter_in(struct peer *peer, const u8 *msg)
* both set first_timestamp to 0xFFFFFFFF to indicate that. */
if (peer->gs.timestamp_min == UINT32_MAX)
peer->gs.off = peer->daemon->gossip_store_end;
else
peer->gs.off = 1;
else {
/* Second optimation: it's common to ask for "recent" gossip,
* so we don't have to start at beginning of store. */
update_recent_timestamp(peer->daemon);
if (peer->gs.timestamp_min >= peer->daemon->gossip_recent_time)
peer->gs.off = peer->daemon->gossip_store_recent_off;
else
peer->gs.off = 1;
}
/* BOLT #7:
* - MAY wait for the next outgoing gossip flush to send these.