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More accurate elements commitment tx size estimation

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This commit is contained in:
Greg Sanders
2023-02-03 11:32:29 -05:00
committed by Alex Myers
parent dc4ae9deb4
commit eef0c087fc
4 changed files with 27 additions and 19 deletions
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12
common/initial_commit_tx.h
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@@ -28,6 +28,7 @@ static inline size_t commit_tx_base_weight(size_t num_untrimmed_htlcs,
bool option_anchor_outputs)
{
size_t weight;
size_t num_outputs;
/* BOLT #3:
*
@@ -35,11 +36,13 @@ static inline size_t commit_tx_base_weight(size_t num_untrimmed_htlcs,
* - MUST be calculated to match:
* 1. Start with `weight` = 724 (1124 if `option_anchors` applies).
*/
if (option_anchor_outputs)
if (option_anchor_outputs) {
weight = 1124;
else
num_outputs = 4;
} else {
weight = 724;
num_outputs = 2;
}
/* BOLT #3:
*
* 2. For each committed HTLC, if that output is not trimmed as
@@ -47,9 +50,10 @@ static inline size_t commit_tx_base_weight(size_t num_untrimmed_htlcs,
* to `weight`.
*/
weight += 172 * num_untrimmed_htlcs;
num_outputs += num_untrimmed_htlcs;
/* Extra fields for Elements */
weight += elements_tx_overhead(chainparams, 1, 1);
weight += elements_tx_overhead(chainparams, 1, num_outputs);
return weight;
}