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gossip: Send keepalive channel_updates

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Signed-off-by: Christian Decker <decker.christian@gmail.com>
This commit is contained in:
Christian Decker 2018-01-09 20:00:05 +01:00 committed by Rusty Russell
parent 4470612016
commit 574dc8cd1f
1 changed files with 83 additions and 0 deletions
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83
gossipd/gossip.c
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@ -1197,14 +1197,97 @@ fail:
return -1;
}
static void gossip_send_keepalive_update(struct routing_state *rstate,
struct node_connection *nc)
{
tal_t *tmpctx = tal_tmpctx(nc);
size_t plen = tal_len(nc->channel_update);
secp256k1_ecdsa_signature sig;
struct bitcoin_blkid chain_hash;
struct short_channel_id scid;
u32 timestamp, fee_base_msat, fee_proportional_millionths;
u64 htlc_minimum_msat;
u16 flags, cltv_expiry_delta;
u8 *update, *msg;
/* Parse old update */
if (!fromwire_channel_update(
nc->channel_update, &plen, &sig, &chain_hash, &scid, &timestamp,
&flags, &cltv_expiry_delta, &htlc_minimum_msat, &fee_base_msat,
&fee_proportional_millionths)) {
status_failed(
STATUS_FAIL_INTERNAL_ERROR,
"Unable to parse previously accepted channel_update");
}
/* Now generate a new update, with up to date timestamp */
timestamp = time_now().ts.tv_sec;
update =
towire_channel_update(tmpctx, &sig, &chain_hash, &scid, timestamp,
flags, cltv_expiry_delta, htlc_minimum_msat,
fee_base_msat, fee_proportional_millionths);
if (!wire_sync_write(HSM_FD,
towire_hsm_cupdate_sig_req(tmpctx, update))) {
status_failed(STATUS_FAIL_HSM_IO, "Writing cupdate_sig_req: %s",
strerror(errno));
}
msg = wire_sync_read(tmpctx, HSM_FD);
if (!msg || !fromwire_hsm_cupdate_sig_reply(tmpctx, msg, NULL, &update)) {
status_failed(STATUS_FAIL_HSM_IO,
"Reading cupdate_sig_req: %s",
strerror(errno));
}
status_trace("Sending keepalive channel_update for %s",
type_to_string(tmpctx, struct short_channel_id, &scid));
handle_channel_update(rstate, update);
tal_free(tmpctx);
}
static void gossip_prune_network(struct daemon *daemon)
{
u64 now = time_now().ts.tv_sec;
/* Schedule next run now */
new_reltimer(&daemon->timers, daemon,
time_from_sec(daemon->update_channel_interval/2),
gossip_prune_network, daemon);
/* Find myself in the network */
struct node *n = node_map_get(daemon->rstate->nodes, &daemon->id.pubkey);
if (!n) {
status_trace("Could not find myself in the nodemap, do we have a channel yet?");
return;
}
/* Iterate through all outgoing connection and check whether
* it's time to re-announce */
for (size_t i=0; i<tal_count(n->out); i++) {
struct node_connection *nc = n->out[i];
if (!nc->channel_update) {
/* Connection is not public yet, so don't even
* try to re-announce it */
continue;
}
if (now - nc->last_timestamp < daemon->update_channel_interval) {
/* No need to send a keepalive update message */
continue;
}
if (!nc->active) {
/* Only send keepalives for active connections */
continue;
}
gossip_send_keepalive_update(daemon->rstate, nc);
}
}
static struct io_plan *connection_in(struct io_conn *conn, struct daemon *daemon)
{
struct wireaddr addr;