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channeld: add routing to get our own channel's channel_update.

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We'll use this in the next patch for when we need to create errors to
send back to lightningd; most commonly when the channel doesn't have
capacity for the HTLC.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2020-02-18 10:31:58 +10:30
parent a150b09665
commit 1a3ed18959
1 changed files with 22 additions and 0 deletions
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22
channeld/channeld.c
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@@ -307,6 +307,28 @@ static void send_channel_update(struct peer *peer, int disable_flag)
wire_sync_write(peer->pps->gossip_fd, take(msg));
}
/* Get the latest channel update for this channel from gossipd */
static NEEDED const u8 *get_local_channel_update(const tal_t *ctx, struct peer *peer)
{
const u8 *msg;
msg = towire_gossipd_get_update(NULL, &peer->short_channel_ids[LOCAL]);
wire_sync_write(peer->pps->gossip_fd, take(msg));
/* Wait for reply to come back; handle other gossipd msgs meanwhile */
while ((msg = wire_sync_read(tmpctx, peer->pps->gossip_fd)) != NULL) {
u8 *update;
if (fromwire_gossipd_get_update_reply(ctx, msg, &update))
return update;
handle_gossip_msg(peer->pps, take(msg));
}
/* Gossipd hangs up on us to kill us when a new
* connection comes in. */
peer_failed_connection_lost();
}
/**
* Add a channel locally and send a channel update to the peer
*