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daemon: handle HTLC as per BOLT #2 algorithm.

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From BOLT#2 (rev 8ee09e749990a11fa53bea03d5961cfde4be4616):

   Thus each node (conceptually) tracks:
...
   3. Two *unacked changesets*: one for the local commitment (their proposals) and one for the remote (our proposals)
   4. Two *acked changesets*: one for the local commitment (our proposals, acknowledged) and one for the remote (their proposals, acknowledged).

   (Note that an implementation MAY optimize this internally, for
   example, pre-applying the changesets in some cases).

In our case, we apply the unacked changes immediately into
staging_cstate, and save them in an unacked_changes array.  That array
gets applied to staging_cstate as soon as it's acked (we only allow
one outstanding update_commit, so we only need one array).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2016-05-26 15:25:24 +09:30
parent cf7a7a7273
commit 2bf43f1ebd
4 changed files with 207 additions and 105 deletions
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13
daemon/peer.h
View File

@@ -84,8 +84,11 @@ struct peer_visible_state {
struct sha256 next_revocation_hash;
/* Commit txs: last one is current. */
struct commit_info *commit;
/* cstate to generate next commitment tx. */
struct channel_state *staging_cstate;
/* unacked changes (already applied to staging_cstate) */
union htlc_staging *unacked_changes;
};
struct htlc_progress {
@@ -236,6 +239,13 @@ void set_peer_state(struct peer *peer, enum state newstate, const char *why);
/* Call this after commit changes, or revocation accepted/sent. */
void peer_check_if_cleared(struct peer *peer);
/* Set up timer: we have something we can commit. */
void remote_changes_pending(struct peer *peer);
/* Add this unacked change */
void add_unacked(struct peer_visible_state *which,
const union htlc_staging *stage);
void peer_add_htlc_expiry(struct peer *peer,
const struct abs_locktime *expiry);
@@ -244,8 +254,5 @@ struct bitcoin_tx *peer_create_close_tx(struct peer *peer, u64 fee);
uint64_t commit_tx_fee(const struct bitcoin_tx *commit,
uint64_t anchor_satoshis);
/* We have something pending for them. */
void their_commit_changed(struct peer *peer);
bool resolve_one_htlc(struct peer *peer, u64 id, const struct sha256 *preimage);
#endif /* LIGHTNING_DAEMON_PEER_H */