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funding: explicitly mark which side offered the anchor.

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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>
This commit is contained in:
Rusty Russell 2016-03-15 17:07:30 +10:30
parent cb0cc80984
commit 85147347e2
4 changed files with 22 additions and 35 deletions
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9
daemon/packets.c
View File

@ -448,8 +448,7 @@ Pkt *accept_pkt_htlc_add(const tal_t *ctx,
}
cur->cstate = copy_funding(cur, peer->cstate);
if (!funding_delta(peer->them.offer_anchor == CMD_OPEN_WITH_ANCHOR,
peer->anchor.satoshis,
if (!funding_delta(peer->anchor.satoshis,
0, cur->htlc->msatoshis,
&cur->cstate->b, &cur->cstate->a)) {
err = pkt_err(ctx, "Cannot afford %"PRIu64" milli-satoshis",
@ -510,8 +509,7 @@ Pkt *accept_pkt_htlc_fail(const tal_t *ctx, struct peer *peer, const Pkt *pkt)
/* Removing it should not fail: we regain HTLC amount */
cur->cstate = copy_funding(cur, peer->cstate);
if (!funding_delta(peer->us.offer_anchor == CMD_OPEN_WITH_ANCHOR,
peer->anchor.satoshis,
if (!funding_delta(peer->anchor.satoshis,
0, -cur->htlc->msatoshis,
&cur->cstate->a, &cur->cstate->b)) {
fatal("Unexpected failure fulfilling HTLC of %"PRIu64
@ -560,8 +558,7 @@ Pkt *accept_pkt_htlc_fulfill(const tal_t *ctx,
/* Removing it should not fail: they gain HTLC amount */
cur->cstate = copy_funding(cur, peer->cstate);
if (!funding_delta(peer->us.offer_anchor == CMD_OPEN_WITH_ANCHOR,
peer->anchor.satoshis,
if (!funding_delta(peer->anchor.satoshis,
-cur->htlc->msatoshis,
-cur->htlc->msatoshis,
&cur->cstate->a, &cur->cstate->b)) {

17
daemon/peer.c
View File

@ -834,9 +834,7 @@ bool peer_create_close_tx(struct peer *peer, u64 fee_satoshis)
/* We don't need a deep copy here, just fee levels. */
cstate = *peer->cstate;
if (!adjust_fee(peer->us.offer_anchor == CMD_OPEN_WITH_ANCHOR,
peer->anchor.satoshis,
fee_satoshis,
if (!adjust_fee(peer->anchor.satoshis, fee_satoshis,
&cstate.a, &cstate.b))
return false;
@ -1322,9 +1320,7 @@ static void check_htlc_expiry(struct peer *peer, void *unused)
cstate = copy_funding(peer, peer->cstate);
/* This should never fail! */
if (!funding_delta(peer->them.offer_anchor
== CMD_OPEN_WITH_ANCHOR,
peer->anchor.satoshis,
if (!funding_delta(peer->anchor.satoshis,
0,
-htlc->msatoshis,
&cstate->b, &cstate->a)) {
@ -1371,8 +1367,7 @@ static void do_newhtlc(struct peer *peer, struct newhtlc *newhtlc)
/* Can we even offer this much? We check now, just before we
* execute. */
cstate = copy_funding(newhtlc, peer->cstate);
if (!funding_delta(peer->us.offer_anchor == CMD_OPEN_WITH_ANCHOR,
peer->anchor.satoshis,
if (!funding_delta(peer->anchor.satoshis,
0, newhtlc->htlc->msatoshis,
&cstate->a, &cstate->b)) {
command_fail(newhtlc->jsoncmd,
@ -1508,8 +1503,7 @@ static void do_fullfill(struct peer *peer,
cstate = copy_funding(fulfillhtlc, peer->cstate);
/* This should never fail! */
if (!funding_delta(peer->them.offer_anchor == CMD_OPEN_WITH_ANCHOR,
peer->anchor.satoshis,
if (!funding_delta(peer->anchor.satoshis,
-htlc->msatoshis,
-htlc->msatoshis,
&cstate->b, &cstate->a)) {
@ -1599,8 +1593,7 @@ static void do_failhtlc(struct peer *peer,
cstate = copy_funding(failhtlc, peer->cstate);
/* This should never fail! */
if (!funding_delta(peer->them.offer_anchor == CMD_OPEN_WITH_ANCHOR,
peer->anchor.satoshis,
if (!funding_delta(peer->anchor.satoshis,
0,
-htlc->msatoshis,
&cstate->b, &cstate->a)) {

21
funding.c
View File

@ -45,8 +45,7 @@ static uint64_t htlcs_total(const struct channel_htlc *htlcs)
return total;
}
static bool change_funding(bool a_is_funder,
uint64_t anchor_satoshis,
static bool change_funding(uint64_t anchor_satoshis,
int64_t delta_a_msat,
int64_t htlc_msat,
uint64_t a, uint64_t b, uint64_t fee,
@ -59,6 +58,7 @@ static bool change_funding(bool a_is_funder,
assert(a + b + htlcs_total(a_side->htlcs) + htlcs_total(b_side->htlcs)
== anchor_satoshis * 1000);
assert(a_side->offered_anchor != b_side->offered_anchor);
/* B gets whatever A gives. */
delta_b_msat = -delta_a_msat;
@ -76,7 +76,7 @@ static bool change_funding(bool a_is_funder,
b += delta_b_msat;
/* Take off fee from both parties if possible. */
if (a_is_funder)
if (a_side->offered_anchor)
got_fees = subtract_fees(&a, &b, &a_fee, &b_fee,
delta_b_msat < 0, fee);
else
@ -94,8 +94,7 @@ static bool change_funding(bool a_is_funder,
return true;
}
bool funding_delta(bool a_is_funder,
uint64_t anchor_satoshis,
bool funding_delta(uint64_t anchor_satoshis,
int64_t delta_a_msat,
int64_t htlc_msat,
struct channel_oneside *a_side,
@ -109,7 +108,7 @@ bool funding_delta(bool a_is_funder,
b = b_side->pay_msat + b_side->fee_msat;
fee = a_side->fee_msat + b_side->fee_msat;
return change_funding(a_is_funder, anchor_satoshis,
return change_funding(anchor_satoshis,
delta_a_msat, htlc_msat,
a, b, fee,
a_side, b_side);
@ -134,19 +133,19 @@ struct channel_state *initial_funding(const tal_t *ctx,
/* Initially, all goes back to funder. */
state->a.pay_msat = anchor_satoshis * 1000 - fee * 1000;
state->a.fee_msat = fee * 1000;
state->a.offered_anchor = true;
state->b.offered_anchor = false;
/* If B (not A) is funder, invert. */
if (!am_funder)
invert_cstate(state);
/* Make sure it checks out. */
assert(funding_delta(am_funder, anchor_satoshis, 0, 0,
&state->a, &state->b));
assert(funding_delta(anchor_satoshis, 0, 0, &state->a, &state->b));
return state;
}
bool adjust_fee(bool a_is_funder,
uint64_t anchor_satoshis,
bool adjust_fee(uint64_t anchor_satoshis,
uint64_t fee_satoshis,
struct channel_oneside *a_side,
struct channel_oneside *b_side)
@ -157,7 +156,7 @@ bool adjust_fee(bool a_is_funder,
b = b_side->pay_msat + b_side->fee_msat;
/* No HTLC or delta, just fee recalculate. */
return change_funding(a_is_funder, anchor_satoshis,
return change_funding(anchor_satoshis,
0, 0, a, b, fee_satoshis * 1000,
a_side, b_side);
}

10
funding.h
View File

@ -15,6 +15,8 @@ struct channel_htlc {
struct channel_oneside {
/* Payment and fee is in millisatoshi. */
uint32_t pay_msat, fee_msat;
/* Did we offer the anchor? */
bool offered_anchor;
/* Use tal_count to get the number */
struct channel_htlc *htlcs;
};
@ -47,15 +49,13 @@ struct channel_state *copy_funding(const tal_t *ctx,
/**
* funding_delta: With this change, what's the new state?
* @a_is_funder: is A paying for the anchor?
* @anchor_satoshis: The anchor amount.
* @delta_a: How many millisatoshi A changes (-ve => A pay B, +ve => B pays A)
* @htlc: Millisatoshi A is putting into a HTLC (-ve if htlc is cancelled)
* @a_side: channel a's state to update.
* @b_side: channel b's state to update.
*/
bool funding_delta(bool a_is_funder,
uint64_t anchor_satoshis,
bool funding_delta(uint64_t anchor_satoshis,
int64_t delta_a_msat,
int64_t htlc_msat,
struct channel_oneside *a_side,
@ -63,14 +63,12 @@ bool funding_delta(bool a_is_funder,
/**
* adjust_fee: Change fee.
* @a_is_funder: is A paying for the anchor?
* @anchor_satoshis: The anchor amount.
* @fee_satoshis: The new fee amount.
* @a_side: channel a's state to update.
* @b_side: channel b's state to update.
*/
bool adjust_fee(bool a_is_funder,
uint64_t anchor_satoshis,
bool adjust_fee(uint64_t anchor_satoshis,
uint64_t fee_satoshis,
struct channel_oneside *a_side,
struct channel_oneside *b_side);