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