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gossipd: local_direction helper to generalize is_local_channel.

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Increasingly we want to know is it local, and get the direction: it's
more efficient to do both at once.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2021-12-29 13:56:43 +10:30
parent 70ed47d77a
commit 8e37eb0028
2 changed files with 18 additions and 10 deletions
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13
gossipd/routing.c
View file

@ -795,13 +795,6 @@ static void destroy_pending_cannouncement(struct pending_cannouncement *pending,
pending_cannouncement_map_del(&rstate->pending_cannouncements, pending);
}
static bool is_local_channel(const struct routing_state *rstate,
const struct chan *chan)
{
return node_id_eq(&chan->nodes[0]->id, &rstate->local_id)
|| node_id_eq(&chan->nodes[1]->id, &rstate->local_id);
}
static void add_channel_announce_to_broadcast(struct routing_state *rstate,
struct chan *chan,
const u8 *channel_announce,
@ -809,7 +802,7 @@ static void add_channel_announce_to_broadcast(struct routing_state *rstate,
u32 index)
{
u8 *addendum = towire_gossip_store_channel_amount(tmpctx, chan->sat);
bool is_local = is_local_channel(rstate, chan);
bool is_local = local_direction(rstate, chan, NULL);
chan->bcast.timestamp = timestamp;
/* 0, unless we're loading from store */
@ -1381,7 +1374,7 @@ bool routing_add_channel_update(struct routing_state *rstate,
} else if (!is_chan_public(chan)) {
/* For private channels, we get updates without an announce: don't
* broadcast them! But save local ones to store anyway. */
assert(is_local_channel(rstate, chan));
assert(local_direction(rstate, chan, NULL));
/* Don't save if we're loading from store */
if (!index) {
hc->bcast.index
@ -1399,7 +1392,7 @@ bool routing_add_channel_update(struct routing_state *rstate,
hc->bcast.index
= gossip_store_add(rstate->gs, update,
hc->bcast.timestamp,
is_local_channel(rstate, chan),
local_direction(rstate, chan, NULL),
NULL);
if (hc->bcast.timestamp > rstate->last_timestamp
&& hc->bcast.timestamp < time_now().ts.tv_sec)

15
gossipd/routing.h
View file

@ -273,6 +273,21 @@ struct routing_state {
#endif
};
/* Which direction are we? False if neither. */
static inline bool local_direction(struct routing_state *rstate,
const struct chan *chan,
int *direction)
{
for (int dir = 0; dir <= 1; (dir)++) {
if (node_id_eq(&chan->nodes[dir]->id, &rstate->local_id)) {
if (direction)
*direction = dir;
return true;
}
}
return false;
}
static inline struct chan *
get_channel(const struct routing_state *rstate,
const struct short_channel_id *scid)