Function initial_commit_tx

common/initial_commit_tx.c:73–340

}

struct bitcoin_tx *initial_commit_tx(const tal_t *ctx,
				     const struct bitcoin_outpoint *funding,
				     struct amount_sat funding_sats,
				     const struct pubkey funding_key[NUM_SIDES],
				     enum side opener,
				     u16 to_self_delay,
				     const struct keyset *keyset,
				     u32 feerate_per_kw,
				     struct amount_sat dust_limit,
				     struct amount_msat self_pay,
				     struct amount_msat other_pay,
				     struct amount_sat self_reserve,
				     u64 obscured_commitment_number,
				     struct wally_tx_output *direct_outputs[NUM_SIDES],
				     enum side side,
				     u32 csv_lock,
				     bool option_anchor_outputs,
				     bool option_anchors_zero_fee_htlc_tx,
				     char** err_reason)
{
	struct amount_sat base_fee;
	struct bitcoin_tx *tx;
	size_t n, untrimmed;
	bool to_local, to_remote;
	struct amount_msat total_pay;
	struct amount_sat amount;
	enum side lessor = !opener;
	u32 sequence;
	void *dummy_local = (void *)LOCAL, *dummy_remote = (void *)REMOTE;
	/* There is a direct, and possibly an anchor output for each side. */
	const void *output_order[2 * NUM_SIDES];
	const u8 *funding_wscript = bitcoin_redeem_2of2(tmpctx,
							&funding_key[LOCAL],
							&funding_key[REMOTE]);

	if (!amount_msat_add(&total_pay, self_pay, other_pay))
		abort();
	assert(!amount_msat_greater_sat(total_pay, funding_sats));

	/* BOLT #3:
	 *
	 * 1. Calculate which committed HTLCs need to be trimmed (see
	 * [Trimmed Outputs](#trimmed-outputs)).
	 */
	untrimmed = 0;

	/* BOLT #3:
	 *
	 * 2. Calculate the base [commitment transaction
	 * fee](#fee-calculation).
	 */
	base_fee = commit_tx_base_fee(feerate_per_kw, untrimmed,
				      option_anchor_outputs,
				      option_anchors_zero_fee_htlc_tx);

	/* BOLT #3:
	 * If `option_anchors` applies to the commitment
	 * transaction, also subtract two times the fixed anchor size