Function channel_amount_spendable

lightningd/peer_control.c:883–921

}

struct amount_msat channel_amount_spendable(const struct channel *channel)
{
	struct amount_msat spendable;
	bool wumbo;

	/* Compute how much we can send via this channel in one payment. */
	if (!amount_msat_sub_sat(&spendable,
				 channel->our_msat,
				 channel->channel_info.their_config.channel_reserve))
		return AMOUNT_MSAT(0);

	/* Take away any currently-offered HTLCs. */
	subtract_offered_htlcs(channel, &spendable);

	/* If we're opener, subtract txfees we'll need to spend this */
	if (channel->opener == LOCAL) {
		if (!amount_msat_deduct_sat(&spendable,
					    commit_txfee(channel, spendable,
							 LOCAL)))
			return AMOUNT_MSAT(0);
	}

	/* We can't offer an HTLC less than the other side will accept. */
	if (amount_msat_less(spendable,
			     channel->channel_info.their_config.htlc_minimum))
		return AMOUNT_MSAT(0);

	wumbo = feature_negotiated(channel->peer->ld->our_features,
				   channel->peer->their_features,
				   OPT_LARGE_CHANNELS);

	/* We can't offer an HTLC over the max payment threshold either. */
	if (amount_msat_greater(spendable, chainparams->max_payment)
	    && !wumbo) {
		spendable = chainparams->max_payment;
	}

	return spendable;
}

struct amount_msat channel_amount_receivable(const struct channel *channel)
{