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psbt: method to calculate fee paid on PSBT

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This commit is contained in:
niftynei 2021-02-05 18:09:33 -06:00 committed by neil saitug
parent db8fdb848c
commit 5a11c8aa7a
2 changed files with 33 additions and 0 deletions
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27
bitcoin/psbt.c
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@ -820,3 +820,30 @@ void psbt_txid(const tal_t *ctx,
else
wally_tx_free(tx);
}
struct amount_sat psbt_compute_fee(struct wally_psbt *psbt)
{
struct amount_sat fee, input_amt;
struct amount_asset asset;
bool ok;
fee = AMOUNT_SAT(0);
for (size_t i = 0; i < psbt->num_inputs; i++) {
input_amt = psbt_input_get_amount(psbt, i);
ok = amount_sat_add(&fee, fee, input_amt);
assert(ok);
}
for (size_t i = 0; i < psbt->num_outputs; i++) {
asset = wally_tx_output_get_amount(&psbt->tx->outputs[i]);
if (!amount_asset_is_main(&asset)
|| elements_wtx_output_is_fee(psbt->tx, i))
continue;
ok = amount_sat_sub(&fee, fee, amount_asset_to_sat(&asset));
if (!ok)
return AMOUNT_SAT(0);
}
return fee;
}

6
bitcoin/psbt.h
View File

@ -245,6 +245,12 @@ struct amount_sat psbt_input_get_amount(const struct wally_psbt *psbt,
struct amount_sat psbt_output_get_amount(const struct wally_psbt *psbt,
size_t out);
/* psbt_compute_fee - Returns value of fee for PSBT
*
* @psbt -psbt
*/
struct amount_sat psbt_compute_fee(struct wally_psbt *psbt);
/* psbt_has_input - Is this input present on this psbt
*
* @psbt - psbt