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daemon: fix close fee negotiation.

Browse source 
We always set *matches to false (outside the branch, oops).  We also
distinguish the case where we ack from the case where they acked,
which removes a FIXME and makes it work.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2016-04-11 16:30:43 +09:30
parent 4c136dde98
commit 0e07cc7a36
3 changed files with 30 additions and 10 deletions
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21
daemon/packets.c
View file

@ -405,6 +405,8 @@ void queue_pkt_close_signature(struct peer *peer)
peer_sign_mutual_close(peer, close_tx, &our_close_sig);
c->sig = signature_to_proto(c, &our_close_sig);
c->close_fee = peer->closing.our_fee;
log_info(peer->log, "queue_pkt_close_signature: offered close fee %"
PRIu64, c->close_fee);
queue_pkt(peer, PKT__PKT_CLOSE_SIGNATURE, c);
}
@ -748,12 +750,17 @@ Pkt *accept_pkt_close_clearing(struct peer *peer, const Pkt *pkt)
return NULL;
}
Pkt *accept_pkt_close_sig(struct peer *peer, const Pkt *pkt, bool *matches)
Pkt *accept_pkt_close_sig(struct peer *peer, const Pkt *pkt, bool *acked,
bool *we_agree)
{
const CloseSignature *c = pkt->close_signature;
struct bitcoin_tx *close_tx;
struct bitcoin_signature theirsig;
log_info(peer->log, "accept_pkt_close_sig: they offered close fee %"
PRIu64, c->close_fee);
*acked = *we_agree = false;
/* BOLT #2:
*
* The sender MUST set `close_fee` lower than or equal to the fee of the
@ -805,7 +812,8 @@ Pkt *accept_pkt_close_sig(struct peer *peer, const Pkt *pkt, bool *matches)
peer->closing.their_fee = c->close_fee;
if (peer->closing.our_fee == peer->closing.their_fee) {
*matches = true;
log_info(peer->log, "accept_pkt_close_sig: That's an ack");
*acked = true;
} else {
/* Adjust our fee to close on their fee. */
u64 sum;
@ -817,10 +825,13 @@ Pkt *accept_pkt_close_sig(struct peer *peer, const Pkt *pkt, bool *matches)
if (peer->closing.our_fee & 1)
peer->closing.our_fee++;
/* FIXME: Fees may *now* be equal, and they'll
* consider this an ACK! */
log_info(peer->log, "accept_pkt_close_sig: we change to %"PRIu64,
peer->closing.our_fee);
/* Corner case: we may now agree with them. */
if (peer->closing.our_fee == peer->closing.their_fee)
*we_agree = true;
}
*matches = false;
/* FIXME: Dynamic fee! */
return NULL;

16
state.c
View file

@ -516,13 +516,21 @@ enum command_status state(struct peer *peer,
break;
case STATE_WAIT_FOR_CLOSE_SIG:
if (input_is(input, PKT_CLOSE_SIGNATURE)) {
bool matches;
err = accept_pkt_close_sig(peer, idata->pkt, &matches);
bool acked, we_agree;
err = accept_pkt_close_sig(peer, idata->pkt,
&acked, &we_agree);
if (err)
goto err_start_unilateral_close;
/* Did they offer the same fee we did? */
if (matches) {
/* Are we about to offer the same fee they did? */
if (we_agree) {
/* Offer the new fee. */
queue_pkt_close_signature(peer);
acked = true;
}
/* Do fees now match? */
if (acked) {
peer_unwatch_close_timeout(peer,
INPUT_CLOSE_COMPLETE_TIMEOUT);

3
state.h
View file

@ -110,7 +110,8 @@ Pkt *accept_pkt_commit(struct peer *peer, const Pkt *pkt);
Pkt *accept_pkt_revocation(struct peer *peer, const Pkt *pkt);
Pkt *accept_pkt_close_clearing(struct peer *peer, const Pkt *pkt);
Pkt *accept_pkt_close_sig(struct peer *peer, const Pkt *pkt, bool *matches);
Pkt *accept_pkt_close_sig(struct peer *peer, const Pkt *pkt,
bool *acked, bool *we_agree);
/**
* committed_to_htlcs: do we have any locked-in HTLCs?