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In most cases, it's the same as option_anchor_outputs, but for fees it's different. This transformation is the simplest: pass it as a pair, and test it explicitly. In future we could rationalize some paths, but this was nice and mechanical. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
96 lines
3.9 KiB
C
96 lines
3.9 KiB
C
#ifndef LIGHTNING_CHANNELD_COMMIT_TX_H
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#define LIGHTNING_CHANNELD_COMMIT_TX_H
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#include "config.h"
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#include <channeld/channeld_htlc.h>
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#include <common/initial_commit_tx.h>
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struct keyset;
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/**
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* commit_tx_num_untrimmed: how many of these htlc outputs will commit tx have?
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* @htlcs: tal_arr of HTLCs
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* @feerate_per_kw: feerate to use
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* @dust_limit: dust limit below which to trim outputs.
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* @option_anchor_outputs: does option_anchor_outputs apply to this channel?
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* @side: from which side's point of view
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* @option_anchor_outputs: does option_anchor_outputs apply to this channel?
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* @option_anchors_zero_fee_htlc_tx: does option_anchors_zero_fee_htlc_tx apply to this channel?
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*
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* We need @side because HTLC fees are different for offered and
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* received HTLCs.
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*/
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size_t commit_tx_num_untrimmed(const struct htlc **htlcs,
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u32 feerate_per_kw,
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struct amount_sat dust_limit,
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bool option_anchors_zero_fee_htlc_tx,
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bool option_anchor_outputs,
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enum side side);
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/**
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* commit_tx_amount_trimmed: what's the sum of trimmed htlc amounts?
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* @htlcs: tal_arr of HTLCs
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* @feerate_per_kw: feerate to use
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* @dust_limit: dust limit below which to trim outputs.
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* @option_anchor_outputs: does option_anchor_outputs apply to this channel?
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* @side: from which side's point of view
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* @amt: returned, total value trimmed from this commitment
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*
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* We need @side because HTLC fees are different for offered and
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* received HTLCs.
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*
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* Returns false if unable to calculate amount trimmed.
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*/
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bool commit_tx_amount_trimmed(const struct htlc **htlcs,
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u32 feerate_per_kw,
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struct amount_sat dust_limit,
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bool option_anchor_outputs,
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bool option_anchors_zero_fee_htlc_tx,
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enum side side,
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struct amount_msat *amt);
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/**
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* commit_tx: create (unsigned) commitment tx to spend the funding tx output
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* @ctx: context to allocate transaction and @htlc_map from.
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* @funding, @funding_sats: funding outpoint and amount
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* @local_funding_key, @remote_funding_key: keys for funding input.
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* @opener: is the LOCAL or REMOTE paying the fee?
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* @keyset: keys derived for this commit tx.
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* @feerate_per_kw: feerate to use
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* @dust_limit: dust limit below which to trim outputs.
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* @self_pay: amount to pay directly to self
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* @other_pay: amount to pay directly to the other side
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* @htlcs: tal_arr of htlcs committed by transaction (some may be trimmed)
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* @htlc_map: outputed map of outnum->HTLC (NULL for direct outputs).
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* @obscured_commitment_number: number to encode in commitment transaction
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* @direct_outputs: If non-NULL, fill with pointers to the direct (non-HTLC) outputs (or NULL if none).
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* @option_anchor_outputs: does option_anchor_outputs apply to this channel?
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* @side: side to generate commitment transaction for.
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* @option_anchor_outputs: does option_anchor_outputs apply to this channel?
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*
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* We need to be able to generate the remote side's tx to create signatures,
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* but the BOLT is expressed in terms of generating our local commitment
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* transaction, so we carefully use the terms "self" and "other" here.
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*/
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struct bitcoin_tx *commit_tx(const tal_t *ctx,
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const struct bitcoin_outpoint *funding,
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struct amount_sat funding_sats,
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const struct pubkey *local_funding_key,
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const struct pubkey *remote_funding_key,
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enum side opener,
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u16 to_self_delay,
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u32 lease_expiry,
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u32 blockheight,
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const struct keyset *keyset,
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u32 feerate_per_kw,
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struct amount_sat dust_limit,
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struct amount_msat self_pay,
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struct amount_msat other_pay,
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const struct htlc **htlcs,
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const struct htlc ***htlcmap,
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struct wally_tx_output *direct_outputs[NUM_SIDES],
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u64 obscured_commitment_number,
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bool option_anchor_outputs,
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bool option_anchors_zero_fee_htlc_tx,
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enum side side);
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#endif /* LIGHTNING_CHANNELD_COMMIT_TX_H */
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