76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
#include "config.h"
|
|
#include <assert.h>
|
|
#include <bitcoin/script.h>
|
|
#include <common/close_tx.h>
|
|
#include <common/permute_tx.h>
|
|
#include <common/psbt_keypath.h>
|
|
#include <common/utils.h>
|
|
|
|
struct bitcoin_tx *create_close_tx(const tal_t *ctx,
|
|
const struct chainparams *chainparams,
|
|
u32 *local_wallet_index,
|
|
const struct ext_key *local_wallet_ext_key,
|
|
const u8 *our_script,
|
|
const u8 *their_script,
|
|
const u8 *funding_wscript,
|
|
const struct bitcoin_outpoint *funding,
|
|
struct amount_sat funding_sats,
|
|
struct amount_sat to_us,
|
|
struct amount_sat to_them,
|
|
struct amount_sat dust_limit)
|
|
{
|
|
struct bitcoin_tx *tx;
|
|
size_t num_outputs = 0;
|
|
struct amount_sat total_out;
|
|
u8 *script;
|
|
|
|
assert(amount_sat_add(&total_out, to_us, to_them));
|
|
assert(amount_sat_less_eq(total_out, funding_sats));
|
|
|
|
/* BOLT #3:
|
|
*
|
|
* ## Closing Transaction
|
|
*
|
|
* Note that there are two possible variants for each node.
|
|
*
|
|
* * version: 2
|
|
* * locktime: 0
|
|
* * txin count: 1
|
|
*/
|
|
/* Now create close tx: one input, two outputs. */
|
|
tx = bitcoin_tx(ctx, chainparams, 1, 2, 0);
|
|
|
|
/* Our input spends the anchor tx output. */
|
|
bitcoin_tx_add_input(tx, funding,
|
|
BITCOIN_TX_DEFAULT_SEQUENCE, NULL,
|
|
funding_sats, NULL, funding_wscript);
|
|
|
|
if (amount_sat_greater_eq(to_us, dust_limit)) {
|
|
script = tal_dup_talarr(tx, u8, our_script);
|
|
/* One output is to us. */
|
|
bitcoin_tx_add_output(tx, script, NULL, to_us);
|
|
assert((local_wallet_index == NULL) == (local_wallet_ext_key == NULL));
|
|
if (local_wallet_index)
|
|
psbt_add_keypath_to_last_output(
|
|
tx, *local_wallet_index, local_wallet_ext_key, is_p2tr(script, NULL));
|
|
num_outputs++;
|
|
}
|
|
|
|
if (amount_sat_greater_eq(to_them, dust_limit)) {
|
|
script = tal_dup_talarr(tx, u8, their_script);
|
|
/* Other output is to them. */
|
|
bitcoin_tx_add_output(tx, script, NULL, to_them);
|
|
num_outputs++;
|
|
}
|
|
|
|
/* Can't have no outputs at all! */
|
|
if (num_outputs == 0)
|
|
return tal_free(tx);
|
|
|
|
permute_outputs(tx, NULL, NULL);
|
|
|
|
bitcoin_tx_finalize(tx);
|
|
assert(bitcoin_tx_check(tx));
|
|
return tx;
|
|
}
|