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gossipd: infrastructure to tell lightningd about local channel updates.

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We want it to keep the latest, so it can make its own error msgs without
asking us.  This installs (but does not use!) the message handler.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2022-01-25 06:28:52 +10:30
parent a8bed542f7
commit 51d23ffcd3
5 changed files with 43 additions and 0 deletions
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1
gossipd/gossipd.c
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@ -1452,6 +1452,7 @@ static struct io_plan *recv_req(struct io_conn *conn,
case WIRE_GOSSIPD_ADDGOSSIP_REPLY:
case WIRE_GOSSIPD_NEW_BLOCKHEIGHT_REPLY:
case WIRE_GOSSIPD_GET_ADDRS_REPLY:
case WIRE_GOSSIPD_GOT_LOCAL_CHANNEL_UPDATE:
break;
}

6
gossipd/gossipd_wire.csv
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@ -116,3 +116,9 @@ msgdata,gossipd_get_addrs,id,node_id,
msgtype,gossipd_get_addrs_reply,3150
msgdata,gossipd_get_addrs_reply,num,u16,
msgdata,gossipd_get_addrs_reply,addrs,wireaddr,num
# Tell master a local channel update (so it can serve errors).
msgtype,gossipd_got_local_channel_update,3151
msgdata,gossipd_got_local_channel_update,scid,short_channel_id,
msgdata,gossipd_got_local_channel_update,len,u16,
msgdata,gossipd_got_local_channel_update,channel_update,u8,len

1 #include <common/cryptomsg.h>
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2
lightningd/channel.c
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@ -253,6 +253,7 @@ struct channel *new_unsaved_channel(struct peer *peer,
= CLOSING_FEE_NEGOTIATION_STEP_UNIT_PERCENTAGE;
channel->shutdown_wrong_funding = NULL;
channel->closing_feerate_range = NULL;
channel->channel_update = NULL;
/* Channel is connected! */
channel->connected = true;
@ -461,6 +462,7 @@ struct channel *new_channel(struct peer *peer, u64 dbid,
channel->lease_chan_max_msat = lease_chan_max_msat;
channel->lease_chan_max_ppt = lease_chan_max_ppt;
channel->blockheight_states = dup_height_states(channel, height_states);
channel->channel_update = NULL;
list_add_tail(&peer->channels, &channel->list);
channel->rr_number = peer->ld->rr_counter++;

3
lightningd/channel.h
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@ -237,6 +237,9 @@ struct channel {
u32 lease_chan_max_msat;
/* Lease commited max part per thousandth channel fee (ppm * 1000) */
u16 lease_chan_max_ppt;
/* Latest channel_update, for use in error messages. */
u8 *channel_update;
};
/* For v2 opens, a channel that has not yet been committed/saved to disk */

31
lightningd/gossip_control.c
View File

@ -5,10 +5,12 @@
#include <common/json_helpers.h>
#include <common/json_tok.h>
#include <common/param.h>
#include <common/type_to_string.h>
#include <gossipd/gossipd_wiregen.h>
#include <hsmd/capabilities.h>
#include <lightningd/bitcoind.h>
#include <lightningd/chaintopology.h>
#include <lightningd/channel.h>
#include <lightningd/gossip_control.h>
#include <lightningd/hsm_control.h>
#include <lightningd/jsonrpc.h>
@ -107,6 +109,32 @@ static void get_txout(struct subd *gossip, const u8 *msg)
}
}
static void handle_local_channel_update(struct lightningd *ld, const u8 *msg)
{
struct short_channel_id scid;
u8 *update;
struct channel *channel;
if (!fromwire_gossipd_got_local_channel_update(msg, msg,
&scid, &update)) {
fatal("Gossip gave bad GOSSIP_GOT_LOCAL_CHANNEL_UPDATE %s",
tal_hex(msg, msg));
}
/* In theory this could vanish before gossipd gets around to telling
* us. */
channel = any_channel_by_scid(ld, &scid);
if (!channel) {
log_broken(ld->log, "Local update for bad scid %s",
type_to_string(tmpctx, struct short_channel_id,
&scid));
return;
}
tal_free(channel->channel_update);
channel->channel_update = tal_steal(channel, update);
}
static unsigned gossip_msg(struct subd *gossip, const u8 *msg, const int *fds)
{
enum gossipd_wire t = fromwire_peektype(msg);
@ -144,6 +172,9 @@ static unsigned gossip_msg(struct subd *gossip, const u8 *msg, const int *fds)
case WIRE_GOSSIPD_GET_TXOUT:
get_txout(gossip, msg);
break;
case WIRE_GOSSIPD_GOT_LOCAL_CHANNEL_UPDATE:
handle_local_channel_update(gossip->ld, msg);
break;
}
return 0;
}