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85147347e2
The channel funding code needs to know who offered the anchor, as they are responsible for paying fees until the other side is able to. This is actually a hack, but at least now it's internal to funding and not passed in at every funding_delta() call. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
119 lines
3.4 KiB
C
119 lines
3.4 KiB
C
#ifndef LIGHTNING_FUNDING_H
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#define LIGHTNING_FUNDING_H
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#include "config.h"
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#include "bitcoin/locktime.h"
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#include <ccan/crypto/sha256/sha256.h>
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#include <ccan/tal/tal.h>
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#include <stdbool.h>
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struct channel_htlc {
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u64 msatoshis;
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struct abs_locktime expiry;
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struct sha256 rhash;
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};
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struct channel_oneside {
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/* Payment and fee is in millisatoshi. */
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uint32_t pay_msat, fee_msat;
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/* Did we offer the anchor? */
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bool offered_anchor;
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/* Use tal_count to get the number */
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struct channel_htlc *htlcs;
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};
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struct channel_state {
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struct channel_oneside a, b;
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};
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/**
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* initial_funding: Given A, B, and anchor, what is initial state?
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* @ctx: tal context to allocate return value from.
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* @am_funder: am I paying for the anchor?
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* @anchor_satoshis: The anchor amount.
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* @fee: amount to pay in fees (in satoshi).
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*
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* Returns state, or NULL if malformed.
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*/
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struct channel_state *initial_funding(const tal_t *ctx,
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bool am_funder,
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uint64_t anchor_satoshis,
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uint64_t fee);
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/**
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* copy_funding: Make a deep copy of channel_state
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* @ctx: tal context to allocate return value from.
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* @cstate: state to copy.
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*/
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struct channel_state *copy_funding(const tal_t *ctx,
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const struct channel_state *cstate);
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/**
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* funding_delta: With this change, what's the new state?
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* @anchor_satoshis: The anchor amount.
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* @delta_a: How many millisatoshi A changes (-ve => A pay B, +ve => B pays A)
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* @htlc: Millisatoshi A is putting into a HTLC (-ve if htlc is cancelled)
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* @a_side: channel a's state to update.
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* @b_side: channel b's state to update.
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*/
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bool funding_delta(uint64_t anchor_satoshis,
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int64_t delta_a_msat,
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int64_t htlc_msat,
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struct channel_oneside *a_side,
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struct channel_oneside *b_side);
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/**
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* adjust_fee: Change fee.
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* @anchor_satoshis: The anchor amount.
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* @fee_satoshis: The new fee amount.
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* @a_side: channel a's state to update.
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* @b_side: channel b's state to update.
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*/
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bool adjust_fee(uint64_t anchor_satoshis,
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uint64_t fee_satoshis,
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struct channel_oneside *a_side,
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struct channel_oneside *b_side);
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/**
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* commit_fee: Fee amount for commit tx.
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* @a_satoshis: A's openchannel->commitment_fee offer
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* @b_satoshis: B's openchannel->commitment_fee offer
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*/
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uint64_t commit_fee(uint64_t a_satoshis, uint64_t b_satoshis);
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/**
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* invert_cstate: Get the other side's state.
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* @cstate: the state to invert.
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*/
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void invert_cstate(struct channel_state *cstate);
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/**
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* funding_add_htlc: append an HTLC to this side of the channel.
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* @creator: channel_state->a or channel_state->b, whichever originated htlc
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* @msatoshis: amount in millisatoshi
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* @expiry: time it expires
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* @rhash: hash of redeem secret
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*/
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void funding_add_htlc(struct channel_oneside *creator,
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u32 msatoshis, const struct abs_locktime *expiry,
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const struct sha256 *rhash);
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/**
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* funding_find_htlc: find an HTLC on this side of the channel.
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* @creator: channel_state->a or channel_state->b, whichever originated htlc
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* @rhash: hash of redeem secret
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*
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* Returns a number < tal_count(creator->htlcs), or == tal_count(creator->htlcs)
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* on fail.
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*/
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size_t funding_find_htlc(struct channel_oneside *creator,
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const struct sha256 *rhash);
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/**
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* funding_remove_htlc: remove an HTLC from this side of the channel.
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* @creator: channel_state->a or channel_state->b, whichever originated htlc
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* @i: index returned from funding_find_htlc.
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*/
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void funding_remove_htlc(struct channel_oneside *creator, size_t i);
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#endif /* LIGHTNING_FUNDING_H */
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