mirror of
https://github.com/ElementsProject/lightning.git
synced 2024-11-19 18:11:28 +01:00
65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
#include "bitcoin/script.h"
|
|
#include "bitcoin/tx.h"
|
|
#include "close_tx.h"
|
|
#include "permute_tx.h"
|
|
#include <assert.h>
|
|
|
|
struct bitcoin_tx *create_close_tx(const tal_t *ctx,
|
|
const u8 *our_script,
|
|
const u8 *their_script,
|
|
const struct sha256_double *anchor_txid,
|
|
unsigned int anchor_index,
|
|
u64 anchor_satoshis,
|
|
uint64_t to_us, uint64_t to_them,
|
|
uint64_t dust_limit)
|
|
{
|
|
struct bitcoin_tx *tx;
|
|
size_t num_outputs = 0;
|
|
|
|
assert(to_us + to_them <= anchor_satoshis);
|
|
|
|
/* BOLT #3:
|
|
*
|
|
* ## Closing Transaction
|
|
*
|
|
* Note that there are two possible variants for each node.
|
|
*
|
|
* * version: 1
|
|
* * locktime: 0
|
|
* * txin count: 1
|
|
*/
|
|
/* Now create close tx: one input, two outputs. */
|
|
tx = bitcoin_tx(ctx, 1, 2);
|
|
tx->version = 1;
|
|
|
|
/* Our input spends the anchor tx output. */
|
|
tx->input[0].txid = *anchor_txid;
|
|
tx->input[0].index = anchor_index;
|
|
tx->input[0].amount = tal_dup(tx->input, u64, &anchor_satoshis);
|
|
|
|
if (to_us >= dust_limit) {
|
|
/* One output is to us. */
|
|
tx->output[num_outputs].amount = to_us;
|
|
tx->output[num_outputs].script = tal_dup_arr(tx, u8,
|
|
our_script, tal_count(our_script), 0);
|
|
num_outputs++;
|
|
}
|
|
|
|
if (to_them >= dust_limit) {
|
|
/* Other output is to them. */
|
|
tx->output[num_outputs].amount = to_them;
|
|
tx->output[num_outputs].script = tal_dup_arr(tx, u8,
|
|
their_script, tal_count(their_script),
|
|
0);
|
|
num_outputs++;
|
|
}
|
|
|
|
/* Can't have no outputs at all! */
|
|
if (num_outputs == 0)
|
|
return tal_free(tx);
|
|
tal_resize(&tx->output, num_outputs);
|
|
|
|
permute_outputs(tx->output, num_outputs, NULL);
|
|
return tx;
|
|
}
|