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99 lines
3.7 KiB
99 lines
3.7 KiB
#ifndef LIGHTNING_LIGHTNINGD_COMMIT_TX_H
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#define LIGHTNING_LIGHTNINGD_COMMIT_TX_H
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#include "config.h"
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#include <bitcoin/pubkey.h>
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#include <daemon/htlc.h>
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struct keyset;
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struct sha256_double;
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/* BOLT #3:
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*
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* This obscures the number of commitments made on the channel in the
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* case of unilateral close, yet still provides a useful index for
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* both nodes (who know the `payment_basepoint`s) to quickly find a
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* revoked commitment transaction.
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*/
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u64 commit_number_obscurer(const struct pubkey *opener_payment_basepoint,
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const struct pubkey *accepter_payment_basepoint);
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/* commit_tx needs to know these so it knows what outputs to trim */
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u64 htlc_success_fee(u64 feerate_per_kw);
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u64 htlc_timeout_fee(u64 feerate_per_kw);
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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_satoshis: dust limit below which to trim outputs.
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* @side: from which side's point of view
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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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u64 feerate_per_kw, u64 dust_limit_satoshis,
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enum side side);
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/* Helper to calculate the base fee if we add this extra htlc */
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u64 commit_tx_base_fee(u64 feerate_per_kw, size_t num_untrimmed_htlcs);
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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_txid, @funding_out, @funding_satoshis: funding outpoint.
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* @funder: 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_satoshis: dust limit below which to trim outputs.
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* @self_pay_msat: amount to pay directly to self
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* @other_pay_msat: 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), or NULL.
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* @obscured_commitment_number: number to encode in commitment transaction
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* @side: side to generate commitment transaction for.
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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 sha256_double *funding_txid,
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unsigned int funding_txout,
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u64 funding_satoshis,
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enum side funder,
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u16 to_self_delay,
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const struct keyset *keyset,
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u64 feerate_per_kw,
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u64 dust_limit_satoshis,
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u64 self_pay_msat,
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u64 other_pay_msat,
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const struct htlc **htlcs,
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const struct htlc ***htlcmap,
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u64 obscured_commitment_number,
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enum side side);
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/* Generate the witness script for an HTLC the other side offered:
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* scriptpubkey_p2wsh(ctx, wscript) gives the scriptpubkey */
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u8 *htlc_received_wscript(const tal_t *ctx,
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const struct ripemd160 *ripemd,
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const struct abs_locktime *expiry,
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const struct keyset *keyset);
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/* Generate the witness script for an HTLC this side offered:
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* scriptpubkey_p2wsh(ctx, wscript) gives the scriptpubkey */
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u8 *htlc_offered_wscript(const tal_t *ctx,
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const struct ripemd160 *ripemd,
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const struct keyset *keyset);
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/* Generate the witness script for the to-self output:
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* scriptpubkey_p2wsh(ctx, wscript) gives the scriptpubkey */
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u8 *to_self_wscript(const tal_t *ctx,
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u16 to_self_delay,
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const struct keyset *keyset);
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/* To-other is simply: scriptpubkey_p2wpkh(tx, keyset->other_payment_key) */
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#endif /* LIGHTNING_LIGHTNINGD_COMMIT_TX_H */
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