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b356dda0ba
Elements requires us to have an explicit fee output instead of bitcoin's implied fee. We add the fee output mostly after sorting the other outputs since that matches the behavior in elements itself. Signed-off-by: Christian Decker <decker.christian@gmail.com>
69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
#include "bitcoin/script.h"
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#include "bitcoin/tx.h"
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#include "close_tx.h"
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#include "permute_tx.h"
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#include <assert.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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const u8 *our_script,
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const u8 *their_script,
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const struct bitcoin_txid *anchor_txid,
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unsigned int anchor_index,
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struct amount_sat funding,
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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));
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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);
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/* Our input spends the anchor tx output. */
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bitcoin_tx_add_input(tx, anchor_txid, anchor_index,
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BITCOIN_TX_DEFAULT_SEQUENCE, funding, NULL);
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if (amount_sat_greater_eq(to_us, dust_limit)) {
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script =
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tal_dup_arr(tx, u8, our_script, tal_count(our_script), 0);
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/* One output is to us. */
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bitcoin_tx_add_output(tx, script, to_us);
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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_arr(tx, u8, their_script,
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tal_count(their_script), 0);
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/* Other output is to them. */
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bitcoin_tx_add_output(tx, script, 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_add_fee_output(tx);
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assert(bitcoin_tx_check(tx));
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return tx;
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}
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