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gossipd: delay generation of local updates. 

We disable the channel every time the peer disconnects; if it reconnects
we get two updates.

The simplest solution: delay all updates by 15 seconds.  Replace any
pending delayed update.  If update is redundant after 15 seconds,
discard.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
ppa-0.6.1
Rusty Russell 7 years ago
committed by Christian Decker
parent
55a09d79b9
commit
f9b8237d50
1 changed files with 147 additions and 55 deletions
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  1. 202
      gossipd/gossip.c

202
gossipd/gossip.c
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@ -106,6 +106,25 @@ HTABLE_DEFINE_TYPE(struct important_peerid,
static u32 max_scids_encode_bytes = -1U;
#endif
struct local_update {
/* daemon->local_updates */
struct list_node list;
/* Because we're handed to a one-arg timer */
struct daemon *daemon;
/* Which channel this is */
struct short_channel_id scid;
/* Which direction we own */
int direction;
u16 cltv_delta;
u64 htlc_minimum_msat;
u32 fee_base_msat, fee_proportional_millionths;
bool disable;
};
struct daemon {
/* Who am I? */
struct pubkey id;
@ -158,6 +177,9 @@ struct daemon {
bool use_proxy_always;
char *tor_password;
/* Unapplied local updates waiting for their timers. */
struct list_head local_updates;
/* @see lightningd.config.use_dns */
bool use_dns;
@ -1671,79 +1693,72 @@ static bool update_redundant(const struct half_chan *hc,
&& hc->proportional_fee == fee_proportional_millionths;
}
static void handle_local_channel_update(struct peer *peer, const u8 *msg)
static struct local_update *find_local_update(struct daemon *daemon,
const struct short_channel_id *scid)
{
struct short_channel_id scid;
u16 cltv_delta;
u64 htlc_minimum_msat;
u32 fee_base_msat, fee_proportional_millionths;
bool disable;
struct chan *chan;
int direction;
u8 *cupdate, *err;
const struct pubkey *my_id = &peer->daemon->rstate->local_id;
struct local_update *i;
if (!fromwire_gossip_local_channel_update(msg, &scid, &disable,
&cltv_delta,
&htlc_minimum_msat,
&fee_base_msat,
&fee_proportional_millionths)) {
status_broken("peer %s bad local_channel_update %s",
type_to_string(tmpctx, struct pubkey, &peer->id),
tal_hex(tmpctx, msg));
return;
list_for_each(&daemon->local_updates, i, list) {
if (structeq(scid, &i->scid))
return i;
}
return NULL;
}
/* Frees local_update */
static void apply_delayed_local_update(struct local_update *local_update)
{
struct chan *chan;
const struct half_chan *hc;
u8 *cupdate, *err;
/* Can theoretically happen if channel just closed. */
chan = get_channel(peer->daemon->rstate, &scid);
chan = get_channel(local_update->daemon->rstate, &local_update->scid);
if (!chan) {
status_trace("peer %s local_channel_update for unknown %s",
type_to_string(tmpctx, struct pubkey, &peer->id),
status_trace("Delayed local_channel_update for unknown %s",
type_to_string(tmpctx, struct short_channel_id,
&scid));
&local_update->scid));
tal_free(local_update);
return;
}
if (pubkey_eq(&chan->nodes[0]->id, my_id))
direction = 0;
else if (pubkey_eq(&chan->nodes[1]->id, my_id))
direction = 1;
else {
status_broken("peer %s bad local_channel_update for non-local %s",
type_to_string(tmpctx, struct pubkey, &peer->id),
type_to_string(tmpctx, struct short_channel_id,
&scid));
return;
}
/* Convenience variable */
hc = &chan->half[local_update->direction];
/* Avoid redundant updates on public channels: on non-public channels
* we'd need to consider pending updates, so don't bother. */
if (is_chan_public(chan)
&& update_redundant(&chan->half[direction],
disable, cltv_delta, htlc_minimum_msat,
fee_base_msat, fee_proportional_millionths)) {
&& update_redundant(hc,
local_update->disable,
local_update->cltv_delta,
local_update->htlc_minimum_msat,
local_update->fee_base_msat,
local_update->fee_proportional_millionths)) {
status_trace("Suppressing redundant channel update for %s:(%u) %s %"PRIu64"/%u vs %u/%u",
type_to_string(tmpctx, struct short_channel_id,
&scid),
direction,
is_halfchan_defined(&chan->half[direction])
? (chan->half[direction].flags & ROUTING_FLAGS_DISABLED ? "DISABLED" : "ACTIVE")
&local_update->scid),
local_update->direction,
is_halfchan_defined(hc)
? (hc->flags & ROUTING_FLAGS_DISABLED ? "DISABLED" : "ACTIVE")
: "UNDEFINED",
chan->half[direction].last_timestamp,
hc->last_timestamp,
(u32)time_now().ts.tv_sec,
chan->half[direction].flags, disable);
hc->flags,
local_update->disable);
tal_free(local_update);
return;
}
cupdate = create_channel_update(tmpctx, peer->daemon->rstate,
chan, direction,
disable, cltv_delta,
htlc_minimum_msat,
fee_base_msat,
fee_proportional_millionths);
cupdate = create_channel_update(tmpctx, local_update->daemon->rstate,
chan, local_update->direction,
local_update->disable,
local_update->cltv_delta,
local_update->htlc_minimum_msat,
local_update->fee_base_msat,
local_update->fee_proportional_millionths);
err = handle_channel_update(peer->daemon->rstate, cupdate,
"local_channel_update");
err = handle_channel_update(local_update->daemon->rstate, cupdate,
"apply_delayed_local_update");
if (err)
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"Rejected local channel update %s: %s",
@ -1751,11 +1766,88 @@ static void handle_local_channel_update(struct peer *peer, const u8 *msg)
tal_hex(tmpctx, err));
/* We always tell peer, even if it's not public yet */
if (!is_chan_public(chan))
queue_peer_msg(peer, take(cupdate));
if (!is_chan_public(chan)) {
struct peer *peer = find_peer(local_update->daemon,
&chan->nodes[!local_update
->direction]->id);
if (peer)
queue_peer_msg(peer, take(cupdate));
}
status_trace("Channel update for %s(%u)%s",
type_to_string(tmpctx, struct short_channel_id,
&local_update->scid),
local_update->direction,
is_chan_public(chan) ? "" : " (private)");
/* That channel_update might trigger our first channel_announcement */
maybe_send_own_node_announce(peer->daemon);
maybe_send_own_node_announce(local_update->daemon);
tal_free(local_update);
}
static void destroy_local_update(struct local_update *local_update)
{
list_del_from(&local_update->daemon->local_updates,
&local_update->list);
}
static void handle_local_channel_update(struct peer *peer, const u8 *msg)
{
struct chan *chan;
struct local_update *local_update;
const struct pubkey *my_id = &peer->daemon->rstate->local_id;
local_update = tal(peer->daemon, struct local_update);
local_update->daemon = peer->daemon;
if (!fromwire_gossip_local_channel_update(msg,
&local_update->scid,
&local_update->disable,
&local_update->cltv_delta,
&local_update->htlc_minimum_msat,
&local_update->fee_base_msat,
&local_update->fee_proportional_millionths)) {
status_broken("peer %s bad local_channel_update %s",
type_to_string(tmpctx, struct pubkey, &peer->id),
tal_hex(tmpctx, msg));
tal_free(local_update);
return;
}
/* Can theoretically happen if channel just closed. */
chan = get_channel(peer->daemon->rstate, &local_update->scid);
if (!chan) {
status_trace("peer %s local_channel_update for unknown %s",
type_to_string(tmpctx, struct pubkey, &peer->id),
type_to_string(tmpctx, struct short_channel_id,
&local_update->scid));
tal_free(local_update);
return;
}
if (pubkey_eq(&chan->nodes[0]->id, my_id))
local_update->direction = 0;
else if (pubkey_eq(&chan->nodes[1]->id, my_id))
local_update->direction = 1;
else {
status_broken("peer %s bad local_channel_update for non-local %s",
type_to_string(tmpctx, struct pubkey, &peer->id),
type_to_string(tmpctx, struct short_channel_id,
&local_update->scid));
tal_free(local_update);
return;
}
/* Free any old unapplied update. */
tal_free(find_local_update(peer->daemon, &local_update->scid));
list_add_tail(&peer->daemon->local_updates, &local_update->list);
tal_add_destructor(local_update, destroy_local_update);
/* Delay 1/4 a broadcast interval */
new_reltimer(&peer->daemon->timers, local_update,
time_from_msec(peer->daemon->broadcast_interval/4),
apply_delayed_local_update, local_update);
}
/**
@ -2930,7 +3022,6 @@ static struct io_plan *gossip_init(struct daemon_conn *master,
/* Now disable all local channels, they can't be connected yet. */
gossip_disable_local_channels(daemon);
new_reltimer(&daemon->timers, daemon,
time_from_sec(daemon->rstate->prune_timeout/4),
gossip_refresh_network, daemon);
@ -3745,6 +3836,7 @@ int main(int argc, char *argv[])
list_head_init(&daemon->reconnecting);
list_head_init(&daemon->reaching);
list_head_init(&daemon->addrhints);
list_head_init(&daemon->local_updates);
important_peerid_map_init(&daemon->important_peerids);
timers_init(&daemon->timers, time_mono());
daemon->broadcast_interval = 30000;

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