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lightningd: simplify funding_depth_cb now it only handles main fundin…
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…g tx.

We make dualopend_tell_depth static, which means we move it
higher in the file.

Signed-off-by: Rusty Russell <[email protected]>
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@rustyrussell
rustyrussell committed Oct 1, 2023
1 parent 0e4e8a3 commit c8d0e93
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Showing 5 changed files with 66 additions and 199 deletions.
84 changes: 42 additions & 42 deletions lightningd/dual_open_control.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -953,6 +953,48 @@ openchannel2_signed_deserialize(struct openchannel2_psbt_payload *payload,
return true;
}

static void dualopend_tell_depth(struct channel *channel,
const struct bitcoin_txid *txid,
u32 depth)
{
const u8 *msg;
u32 to_go;

if (!channel->owner) {
log_debug(channel->log,
"Funding tx %s confirmed, but peer disconnected",
type_to_string(tmpctx, struct bitcoin_txid, txid));
return;
}

log_debug(channel->log,
"Funding tx %s confirmed, telling peer",
type_to_string(tmpctx, struct bitcoin_txid, txid));
if (depth < channel->minimum_depth) {
to_go = channel->minimum_depth - depth;
} else
to_go = 0;

/* Are we there yet? */
if (to_go == 0) {
assert(channel->scid);
assert(bitcoin_txid_eq(&channel->funding.txid, txid));

channel_set_billboard(channel, false,
tal_fmt(tmpctx, "Funding depth reached"
" %d confirmations, alerting peer"
" we're locked-in.",
to_go));

msg = towire_dualopend_depth_reached(NULL, depth);
subd_send_msg(channel->owner, take(msg));
} else
channel_set_billboard(channel, false,
tal_fmt(tmpctx, "Funding needs %d more"
" confirmations to be ready.",
to_go));
}

static enum watch_result opening_depth_cb(struct lightningd *ld,
const struct bitcoin_txid *txid,
const struct bitcoin_tx *tx,
Expand Down Expand Up @@ -1905,48 +1947,6 @@ static void handle_channel_locked(struct subd *dualopend,
return;
}

void dualopend_tell_depth(struct channel *channel,
const struct bitcoin_txid *txid,
u32 depth)
{
const u8 *msg;
u32 to_go;

if (!channel->owner) {
log_debug(channel->log,
"Funding tx %s confirmed, but peer disconnected",
type_to_string(tmpctx, struct bitcoin_txid, txid));
return;
}

log_debug(channel->log,
"Funding tx %s confirmed, telling peer",
type_to_string(tmpctx, struct bitcoin_txid, txid));
if (depth < channel->minimum_depth) {
to_go = channel->minimum_depth - depth;
} else
to_go = 0;

/* Are we there yet? */
if (to_go == 0) {
assert(channel->scid);
assert(bitcoin_txid_eq(&channel->funding.txid, txid));

channel_set_billboard(channel, false,
tal_fmt(tmpctx, "Funding depth reached"
" %d confirmations, alerting peer"
" we're locked-in.",
to_go));

msg = towire_dualopend_depth_reached(NULL, depth);
subd_send_msg(channel->owner, take(msg));
} else
channel_set_billboard(channel, false,
tal_fmt(tmpctx, "Funding needs %d more"
" confirmations to be ready.",
to_go));
}

static void rbf_got_offer(struct subd *dualopend, const u8 *msg)
{
/* We expect the channel to still exist?! */
Expand Down
4 changes: 0 additions & 4 deletions lightningd/dual_open_control.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -14,10 +14,6 @@ bool peer_restart_dualopend(struct peer *peer,
struct channel *channel,
bool from_abort);

void dualopend_tell_depth(struct channel *channel,
const struct bitcoin_txid *txid,
u32 depth);

void watch_opening_inflight(struct lightningd *ld,
struct channel_inflight *inflight);

Expand Down
163 changes: 24 additions & 139 deletions lightningd/peer_control.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1787,61 +1787,6 @@ void peer_disconnect_done(struct lightningd *ld, const u8 *msg)
maybe_delete_peer(p);
}

static bool check_funding_details(const struct bitcoin_tx *tx,
const u8 *wscript,
struct amount_sat funding,
u32 funding_outnum)
{
struct amount_asset asset;

if (funding_outnum >= tx->wtx->num_outputs)
return false;

asset = bitcoin_tx_output_get_amount(tx, funding_outnum);

if (!amount_asset_is_main(&asset))
return false;

if (!amount_sat_eq(amount_asset_to_sat(&asset), funding))
return false;

return scripteq(scriptpubkey_p2wsh(tmpctx, wscript),
bitcoin_tx_output_get_script(tmpctx, tx,
funding_outnum));
}


/* FIXME: Unify our watch code so we get notified by txout, instead, like
* the wallet code does. */
static bool check_funding_tx(const struct bitcoin_tx *tx,
const struct channel *channel)
{
struct channel_inflight *inflight;
const u8 *wscript;
wscript = bitcoin_redeem_2of2(tmpctx,
&channel->local_funding_pubkey,
&channel->channel_info.remote_fundingkey);

/* Since we've enabled "RBF" for funding transactions,
* it's possible that it's one of "inflights".
* Worth noting that this check was added to prevent
* a peer from sending us a 'bogus' transaction id (that didn't
* actually contain the funding output). As of v2 (where
* RBF is introduced), this isn't a problem so much as
* both sides have full access to the funding transaction */
if (check_funding_details(tx, wscript, channel->funding_sats,
channel->funding.n))
return true;

list_for_each(&channel->inflights, inflight, list) {
if (check_funding_details(tx, wscript,
inflight->funding->total_funds,
inflight->funding->outpoint.n))
return true;
}
return false;
}

void update_channel_from_inflight(struct lightningd *ld,
struct channel *channel,
const struct channel_inflight *inflight)
Expand Down Expand Up @@ -1897,36 +1842,6 @@ void update_channel_from_inflight(struct lightningd *ld,
wallet_channel_save(ld->wallet, channel);
}

static void subd_tell_depth(struct channel *channel,
const struct bitcoin_txid *txid,
unsigned int depth)
{
/* We always tell every owner who's interested about the depth */
switch (channel->state) {
case AWAITING_UNILATERAL:
case CHANNELD_SHUTTING_DOWN:
case CLOSINGD_SIGEXCHANGE:
case CLOSINGD_COMPLETE:
case FUNDING_SPEND_SEEN:
case ONCHAIN:
case CLOSED:
case DUALOPEND_OPEN_INIT:
case DUALOPEND_OPEN_COMMITTED:
return;

case CHANNELD_NORMAL:
case CHANNELD_AWAITING_LOCKIN:
case CHANNELD_AWAITING_SPLICE:
channeld_tell_depth(channel, txid, depth);
return;

case DUALOPEND_AWAITING_LOCKIN:
dualopend_tell_depth(channel, txid, depth);
return;
}
abort();
}

static enum watch_result funding_depth_cb(struct lightningd *ld,
const struct bitcoin_txid *txid,
const struct bitcoin_tx *tx,
Expand All @@ -1937,15 +1852,8 @@ static enum watch_result funding_depth_cb(struct lightningd *ld,
if (is_stub_scid(channel->scid))
return DELETE_WATCH;

/* Sanity check */
if (!check_funding_tx(tx, channel)) {
channel_internal_error(channel, "Bad tx %s: %s",
type_to_string(tmpctx,
struct bitcoin_txid, txid),
type_to_string(tmpctx,
struct bitcoin_tx, tx));
return DELETE_WATCH;
}
/* We only use this to watch the current funding tx */
assert(bitcoin_txid_eq(txid, &channel->funding.txid));

channel->depth = depth;

Expand All @@ -1957,17 +1865,24 @@ static enum watch_result funding_depth_cb(struct lightningd *ld,
if (depth == 0) {
/* That's not entirely unexpected in early states */
switch (channel->state) {
case CHANNELD_AWAITING_SPLICE:
case DUALOPEND_AWAITING_LOCKIN:
case CHANNELD_AWAITING_LOCKIN:
case DUALOPEND_OPEN_INIT:
case DUALOPEND_OPEN_COMMITTED:
/* Shouldn't be here! */
channel_internal_error(channel,
"Bad %s state: %s",
__func__,
channel_state_name(channel));
return DELETE_WATCH;
case CHANNELD_AWAITING_LOCKIN:
/* That's not entirely unexpected in early states */
log_debug(channel->log, "Funding tx %s reorganized out!",
type_to_string(tmpctx, struct bitcoin_txid, txid));
channel->scid = tal_free(channel->scid);
return KEEP_WATCHING;

/* But it's often Bad News in later states */
case CHANNELD_AWAITING_SPLICE:
case CHANNELD_NORMAL:
/* If we opened, or it's zero-conf, we trust them anyway. */
if (channel->opener == LOCAL
Expand Down Expand Up @@ -2004,14 +1919,13 @@ static enum watch_result funding_depth_cb(struct lightningd *ld,
if (!depthcb_update_scid(channel, txid, &channel->funding))
return DELETE_WATCH;

/* Always tell owner about depth change */
subd_tell_depth(channel, txid, depth);

/* Have we not reached minimum depth? */
if (depth < channel->minimum_depth)
return KEEP_WATCHING;

switch (channel->state) {
/* We should not be in the callback! */
case DUALOPEND_AWAITING_LOCKIN:
case DUALOPEND_OPEN_INIT:
case DUALOPEND_OPEN_COMMITTED:
abort();

case AWAITING_UNILATERAL:
case CHANNELD_SHUTTING_DOWN:
case CLOSINGD_SIGEXCHANGE:
Expand All @@ -2027,48 +1941,19 @@ static enum watch_result funding_depth_cb(struct lightningd *ld,
return DELETE_WATCH;

case CHANNELD_AWAITING_LOCKIN:
if (channel->remote_channel_ready)
if (depth >= channel->minimum_depth
&& channel->remote_channel_ready) {
lockin_complete(channel, CHANNELD_AWAITING_LOCKIN);
return KEEP_WATCHING;

}
/* Fall thru */
case CHANNELD_NORMAL:
if (depth < ANNOUNCE_MIN_DEPTH)
case CHANNELD_AWAITING_SPLICE:
channeld_tell_depth(channel, txid, depth);
if (depth < ANNOUNCE_MIN_DEPTH || depth < channel->minimum_depth)
return KEEP_WATCHING;
/* Normal state and past announce depth? Stop bothering us! */
return DELETE_WATCH;

case DUALOPEND_OPEN_INIT:
case DUALOPEND_OPEN_COMMITTED:
/* You cannot be watching yet */
abort();

case DUALOPEND_AWAITING_LOCKIN:
/* Update the channel's info to the correct tx, if needed to
* It's possible an 'inflight' has reached depth */
if (!list_empty(&channel->inflights)) {
struct channel_inflight *inf;

inf = channel_inflight_find(channel, txid);
if (!inf) {
log_debug(channel->log,
"Ignoring event for txid %s for channel"
" not found in inflights.",
type_to_string(tmpctx,
struct bitcoin_txid,
txid));
return DELETE_WATCH;
}
update_channel_from_inflight(ld, channel, inf);
}
return KEEP_WATCHING;

case CHANNELD_AWAITING_SPLICE:
/* Once we're waiting for splice, don't watch original any more */
if (bitcoin_txid_eq(txid, &channel->funding.txid))
return true;
return KEEP_WATCHING;
}

abort();
}

Expand Down
9 changes: 0 additions & 9 deletions lightningd/test/run-invoice-select-inchan.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -89,10 +89,6 @@ struct htlc_in *channel_has_htlc_in(struct channel *channel UNNEEDED)
/* Generated stub for channel_has_htlc_out */
struct htlc_out *channel_has_htlc_out(struct channel *channel UNNEEDED)
{ fprintf(stderr, "channel_has_htlc_out called!\n"); abort(); }
/* Generated stub for channel_inflight_find */
struct channel_inflight *channel_inflight_find(struct channel *channel UNNEEDED,
const struct bitcoin_txid *txid UNNEEDED)
{ fprintf(stderr, "channel_inflight_find called!\n"); abort(); }
/* Generated stub for channel_internal_error */
void channel_internal_error(struct channel *channel UNNEEDED, const char *fmt UNNEEDED, ...)
{ fprintf(stderr, "channel_internal_error called!\n"); abort(); }
Expand Down Expand Up @@ -206,11 +202,6 @@ bool depthcb_update_scid(struct channel *channel UNNEEDED,
/* Generated stub for dev_disconnect_permanent */
bool dev_disconnect_permanent(struct lightningd *ld UNNEEDED)
{ fprintf(stderr, "dev_disconnect_permanent called!\n"); abort(); }
/* Generated stub for dualopend_tell_depth */
void dualopend_tell_depth(struct channel *channel UNNEEDED,
const struct bitcoin_txid *txid UNNEEDED,
u32 depth UNNEEDED)
{ fprintf(stderr, "dualopend_tell_depth called!\n"); abort(); }
/* Generated stub for encode_scriptpubkey_to_addr */
char *encode_scriptpubkey_to_addr(const tal_t *ctx UNNEEDED,
const struct chainparams *chainparams UNNEEDED,
Expand Down
5 changes: 0 additions & 5 deletions wallet/test/run-wallet.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -151,11 +151,6 @@ void derive_channel_id(struct channel_id *channel_id UNNEEDED,
/* Generated stub for dev_disconnect_permanent */
bool dev_disconnect_permanent(struct lightningd *ld UNNEEDED)
{ fprintf(stderr, "dev_disconnect_permanent called!\n"); abort(); }
/* Generated stub for dualopend_tell_depth */
void dualopend_tell_depth(struct channel *channel UNNEEDED,
const struct bitcoin_txid *txid UNNEEDED,
u32 depth UNNEEDED)
{ fprintf(stderr, "dualopend_tell_depth called!\n"); abort(); }
/* Generated stub for ecdh */
void ecdh(const struct pubkey *point UNNEEDED, struct secret *ss UNNEEDED)
{ fprintf(stderr, "ecdh called!\n"); abort(); }
Expand Down

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