mirror of
https://github.com/ElementsProject/lightning.git
synced 2024-11-19 18:11:28 +01:00
85e3b43176
HTLC fees increase (larger weight), and the fee paid by the opener has to include the anchor outputs (i.e. 660 sats). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
45 lines
1.4 KiB
C
45 lines
1.4 KiB
C
#include <common/htlc_trim.h>
|
|
#include <common/htlc_tx.h>
|
|
|
|
/* If this htlc too small to create an output on @side's commitment tx? */
|
|
bool htlc_is_trimmed(enum side htlc_owner,
|
|
struct amount_msat htlc_amount,
|
|
u32 feerate_per_kw,
|
|
struct amount_sat dust_limit,
|
|
enum side side,
|
|
bool option_anchor_outputs)
|
|
{
|
|
struct amount_sat htlc_fee, htlc_min;
|
|
|
|
/* BOLT #3:
|
|
*
|
|
* - for every offered HTLC:
|
|
* - if the HTLC amount minus the HTLC-timeout fee would be less than
|
|
* `dust_limit_satoshis` set by the transaction owner:
|
|
* - MUST NOT contain that output.
|
|
* - otherwise:
|
|
* - MUST be generated as specified in
|
|
* [Offered HTLC Outputs](#offered-htlc-outputs).
|
|
*/
|
|
if (htlc_owner == side)
|
|
htlc_fee = htlc_timeout_fee(feerate_per_kw,
|
|
option_anchor_outputs);
|
|
/* BOLT #3:
|
|
*
|
|
* - for every received HTLC:
|
|
* - if the HTLC amount minus the HTLC-success fee would be less than
|
|
* `dust_limit_satoshis` set by the transaction owner:
|
|
* - MUST NOT contain that output.
|
|
* - otherwise:
|
|
* - MUST be generated as specified in
|
|
*/
|
|
else
|
|
htlc_fee = htlc_success_fee(feerate_per_kw,
|
|
option_anchor_outputs);
|
|
|
|
/* If these overflow, it implies htlc must be less. */
|
|
if (!amount_sat_add(&htlc_min, dust_limit, htlc_fee))
|
|
return true;
|
|
return amount_msat_less_sat(htlc_amount, htlc_min);
|
|
}
|