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gossipd: infrastructure to handle short_channel_id replies. 

We use the same system as for gossip: we trickle out replies when we're
otherwise idle.

This is minimal infrastructure: we don't actually process the
query_short_channel_ids message yet, nor do we append node
announcements.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2018-06-04 13:49:25 +09:30
parent 6c6da45f53
commit 5864415d31
1 changed files with 61 additions and 1 deletions
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62
gossipd/gossip.c
View File

@ -216,6 +216,10 @@ struct peer {
/* High water mark for the staggered broadcast */
u64 broadcast_index;
/* Are there outstanding queries on short_channel_ids? */
const struct short_channel_id *scid_queries;
size_t scid_query_idx;
/* Is it time to continue the staggered broadcast? */
bool gossip_sync;
@ -335,6 +339,8 @@ static struct peer *new_peer(const tal_t *ctx,
peer->daemon = daemon;
peer->local = new_local_peer_state(peer, cs);
peer->remote = NULL;
peer->scid_queries = NULL;
peer->scid_query_idx = 0;
return peer;
}
@ -857,10 +863,58 @@ static void wake_pkt_out(struct peer *peer)
/* Mutual recursion. */
static struct io_plan *peer_pkt_out(struct io_conn *conn, struct peer *peer);
static bool create_next_scid_reply(struct peer *peer)
{
struct routing_state *rstate = peer->daemon->rstate;
size_t i, num;
bool sent = false;
/* BOLT #7:
*
* - SHOULD respond to each known `short_channel_id` with a
* `channel_announce` and the latest `channel_update`s for
* each end
*
* - SHOULD NOT wait for the next outgoing announcement flush
* to send these.
*/
num = tal_count(peer->scid_queries);
for (i = peer->scid_query_idx; !sent && i < num; i++) {
struct chan *chan;
chan = get_channel(rstate, &peer->scid_queries[i]);
if (!chan || is_chan_public(chan))
continue;
queue_peer_msg(peer, chan->channel_announce);
if (chan->half[0].channel_update)
queue_peer_msg(peer, chan->half[0].channel_update);
if (chan->half[1].channel_update)
queue_peer_msg(peer, chan->half[0].channel_update);
sent = true;
}
peer->scid_query_idx = i;
/* All finished? */
if (peer->scid_queries && peer->scid_query_idx == num) {
/* FIXME: Send node_announcements now */
u8 *end = towire_reply_short_channel_ids_end(peer,
&rstate->chain_hash,
true);
queue_peer_msg(peer, take(end));
peer->scid_queries = tal_free(peer->scid_queries);
}
return sent;
}
static struct io_plan *peer_pkt_out(struct io_conn *conn, struct peer *peer)
{
/* First priority is queued packets, if any */
const u8 *out = msg_dequeue(&peer->local->peer_out);
const u8 *out;
again:
out = msg_dequeue(&peer->local->peer_out);
if (out) {
if (is_all_channel_error(out))
return peer_write_message(conn, &peer->local->pcs,
@ -874,6 +928,8 @@ static struct io_plan *peer_pkt_out(struct io_conn *conn, struct peer *peer)
if (peer->local->return_to_master) {
if (!peer_in_started(conn, &peer->local->pcs))
return ready_for_master(conn, peer);
} else if (create_next_scid_reply(peer)) {
goto again;
} else if (peer->gossip_sync) {
/* If we're supposed to be sending gossip, do so now. */
const u8 *next;
@ -1159,6 +1215,10 @@ static bool nonlocal_dump_gossip(struct io_conn *conn, struct daemon_conn *dc)
/* Make sure we are not connected directly */
assert(!peer->local);
/* Do we have scid query replies to send? */
if (create_next_scid_reply(peer))
return true;
/* Nothing to do if we're not gossiping */
if (!peer->gossip_sync)
return false;