| 7 | #include <common/utils.h> |
| 8 | |
| 9 | struct bitcoin_tx *create_close_tx(const tal_t *ctx, |
| 10 | const struct chainparams *chainparams, |
| 11 | u32 *local_wallet_index, |
| 12 | const struct ext_key *local_wallet_ext_key, |
| 13 | const u8 *our_script, |
| 14 | const u8 *their_script, |
| 15 | const u8 *funding_wscript, |
| 16 | const struct bitcoin_outpoint *funding, |
| 17 | struct amount_sat funding_sats, |
| 18 | struct amount_sat to_us, |
| 19 | struct amount_sat to_them, |
| 20 | struct amount_sat dust_limit) |
| 21 | { |
| 22 | struct bitcoin_tx *tx; |
| 23 | size_t num_outputs = 0; |
| 24 | struct amount_sat total_out; |
| 25 | u8 *script; |
| 26 | |
| 27 | assert(amount_sat_add(&total_out, to_us, to_them)); |
| 28 | assert(amount_sat_less_eq(total_out, funding_sats)); |
| 29 | |
| 30 | /* BOLT #3: |
| 31 | * |
| 32 | * ## Closing Transaction |
| 33 | * |
| 34 | * Note that there are two possible variants for each node. |
| 35 | * |
| 36 | * * version: 2 |
| 37 | * * locktime: 0 |
| 38 | * * txin count: 1 |
| 39 | */ |
| 40 | /* Now create close tx: one input, two outputs. */ |
| 41 | tx = bitcoin_tx(ctx, chainparams, 1, 2, 0); |
| 42 | |
| 43 | /* Our input spends the anchor tx output. */ |
| 44 | bitcoin_tx_add_input(tx, funding, |
| 45 | BITCOIN_TX_DEFAULT_SEQUENCE, NULL, |
| 46 | funding_sats, NULL, funding_wscript); |
| 47 | |
| 48 | if (amount_sat_greater_eq(to_us, dust_limit)) { |
| 49 | script = tal_dup_talarr(tx, u8, our_script); |
| 50 | /* One output is to us. */ |
| 51 | bitcoin_tx_add_output(tx, script, NULL, to_us); |
| 52 | assert((local_wallet_index == NULL) == (local_wallet_ext_key == NULL)); |
| 53 | if (local_wallet_index) |
| 54 | psbt_add_keypath_to_last_output( |
| 55 | tx, *local_wallet_index, local_wallet_ext_key); |
| 56 | num_outputs++; |
| 57 | } |
| 58 | |
| 59 | if (amount_sat_greater_eq(to_them, dust_limit)) { |
| 60 | script = tal_dup_talarr(tx, u8, their_script); |
| 61 | /* Other output is to them. */ |
| 62 | bitcoin_tx_add_output(tx, script, NULL, to_them); |
| 63 | num_outputs++; |
| 64 | } |
| 65 | |
| 66 | /* Can't have no outputs at all! */ |
no test coverage detected