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channeld: Code to implement splicing

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Update the lightningd <-> channeld interface with lots of new commands to needed to facilitate spicing.

Implement the channeld splicing protocol leveraging the interactivetx protocol.

Implement lightningd’s channel_control to support channeld in its splicing efforts.

Changelog-Added: Added the features to enable splicing & resizing of active channels.
This commit is contained in:
Dusty Daemon
2023-07-27 14:37:52 -07:00
committed by Rusty Russell
parent ebd0a3fd69
commit 4628e3ace8
88 changed files with 4560 additions and 644 deletions
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15
lightningd/channel.c
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@@ -133,7 +133,9 @@ new_inflight(struct channel *channel,
const u32 lease_chan_max_msat, const u16 lease_chan_max_ppt,
const u32 lease_blockheight_start,
const struct amount_msat lease_fee,
const struct amount_sat lease_amt)
const struct amount_sat lease_amt,
s64 splice_amnt,
bool i_am_initiator)
{
struct wally_psbt *last_tx_psbt_clone;
struct channel_inflight *inflight
@@ -145,6 +147,7 @@ new_inflight(struct channel *channel,
funding->total_funds = total_funds;
funding->feerate = funding_feerate;
funding->our_funds = our_funds;
funding->splice_amnt = splice_amnt;
inflight->funding = funding;
inflight->channel = channel;
@@ -172,6 +175,8 @@ new_inflight(struct channel *channel,
inflight->lease_fee = lease_fee;
inflight->lease_amt = lease_amt;
inflight->i_am_initiator = i_am_initiator;
list_add_tail(&channel->inflights, &inflight->list);
tal_add_destructor(inflight, destroy_inflight);
@@ -595,6 +600,11 @@ bool channel_state_awaitish(const struct channel *channel)
|| channel->state == CHANNELD_AWAITING_SPLICE;
}
bool channel_state_closish(enum channel_state channel_state)
{
return channel_state > CHANNELD_NORMAL && channel_state <= CLOSED;
}
struct channel *peer_any_active_channel(struct peer *peer, bool *others)
{
struct channel *channel, *ret = NULL;
@@ -808,8 +818,7 @@ void channel_set_state(struct channel *channel,
struct timeabs timestamp;
/* set closer, if known */
if (!(state == CHANNELD_AWAITING_SPLICE)
&& state > CHANNELD_NORMAL && channel->closer == NUM_SIDES) {
if (channel_state_closish(state) && channel->closer == NUM_SIDES) {
if (reason == REASON_LOCAL) channel->closer = LOCAL;
if (reason == REASON_USER) channel->closer = LOCAL;
if (reason == REASON_REMOTE) channel->closer = REMOTE;