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[wallet, rpc]: add max_tx_weight to tx funding options

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This allows a transaction's weight to be bound under a certain
weight if possible and desired. This can be beneficial for future
RBF attempts, or whenever a more restricted spend topology is
desired.

Co-authored-by: Greg Sanders <gsanders87@gmail.com>
This commit is contained in:
ismaelsadeeq
2024-02-29 12:43:52 +01:00
parent b6fc5043c1
commit 734076c6de
9 changed files with 119 additions and 17 deletions
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8
src/wallet/coinselection.h
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@@ -174,10 +174,13 @@ struct CoinSelectionParams {
* 1) Received from other wallets, 2) replacing other txs, 3) that have been replaced.
*/
bool m_include_unsafe_inputs = false;
/** The maximum weight for this transaction. */
std::optional<int> m_max_tx_weight{std::nullopt};
CoinSelectionParams(FastRandomContext& rng_fast, int change_output_size, int change_spend_size,
CAmount min_change_target, CFeeRate effective_feerate,
CFeeRate long_term_feerate, CFeeRate discard_feerate, int tx_noinputs_size, bool avoid_partial)
CFeeRate long_term_feerate, CFeeRate discard_feerate, int tx_noinputs_size, bool avoid_partial,
std::optional<int> max_tx_weight = std::nullopt)
: rng_fast{rng_fast},
change_output_size(change_output_size),
change_spend_size(change_spend_size),
@@ -186,7 +189,8 @@ struct CoinSelectionParams {
m_long_term_feerate(long_term_feerate),
m_discard_feerate(discard_feerate),
tx_noinputs_size(tx_noinputs_size),
m_avoid_partial_spends(avoid_partial)
m_avoid_partial_spends(avoid_partial),
m_max_tx_weight(max_tx_weight)
{
}
CoinSelectionParams(FastRandomContext& rng_fast)