lightningd: simply store commit index, rather than count sent/received.

This is what channeld wants to know, so just do that.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

lightningd/channel/channel.c

@@ -1541,7 +1541,6 @@ static void init_channel(struct peer *peer)
 	struct basepoints points[NUM_SIDES];
 	u64 funding_satoshi;
 	u16 funding_txout;
-	u64 commits_sent, commits_received;
 	u64 local_msatoshi;
 	struct pubkey funding_pubkey[NUM_SIDES];
 	struct sha256_double funding_txid;
@@ -1580,8 +1579,8 @@ static void init_channel(struct peer *peer)
 				   &peer->cltv_delta,
 				   &peer->last_was_revoke,
 				   &peer->last_sent_commit,
-				   &commits_sent,
-				   &commits_received,
+				   &peer->commit_index[LOCAL],
+				   &peer->commit_index[REMOTE],
 				   &peer->revocations_received,
 				   &peer->htlc_id,
 				   &htlcs,
@@ -1598,13 +1597,22 @@ static void init_channel(struct peer *peer)
 		status_failed(WIRE_CHANNEL_BAD_COMMAND, "Init: %s",
 			      tal_hex(msg, msg));
 
-	/* First commit is used for opening. */
-	assert(commits_sent > 0);
-	assert(commits_received > 0);
+	status_trace("init %s: remote_per_commit = %s, old_remote_per_commit = %s"
+		     " commit_idx_local = %"PRIu64
+		     " commit_idx_remote = %"PRIu64
+		     " revocations_received = %"PRIu64,
+		     am_funder ? "LOCAL" : "REMOTE",
+		     type_to_string(trc, struct pubkey,
+				    &peer->remote_per_commit),
+		     type_to_string(trc, struct pubkey,
+				    &peer->old_remote_per_commit),
+		     peer->commit_index[LOCAL], peer->commit_index[REMOTE],
+		     peer->revocations_received);
 
-	/* If we've sent 1, we're on index 1. */
-	peer->commit_index[LOCAL] = commits_sent;
-	peer->commit_index[REMOTE] = commits_received;
+	/* First commit is used for opening: if we've sent 0, we're on
+	 * index 1. */
+	assert(peer->commit_index[LOCAL] > 0);
+	assert(peer->commit_index[REMOTE] > 0);
 
 	/* channel_id is set from funding txout */
 	derive_channel_id(&peer->channel_id, &funding_txid, funding_txout);

lightningd/channel/channel_wire.csv

@@ -44,8 +44,8 @@ channel_init,,cltv_delta,u16
 channel_init,,last_was_revoke,bool
 channel_init,,num_last_sent_commit,u16
 channel_init,,last_sent_commit,num_last_sent_commit*struct changed_htlc
-channel_init,,commits_sent,u64
-channel_init,,commits_received,u64
+channel_init,,commit_index_local,u64
+channel_init,,commit_index_remote,u64
 channel_init,,revocations_received,u64
 channel_init,,next_htlc_id,u64
 channel_init,,num_htlcs,u16

lightningd/peer_control.c

@@ -364,7 +364,8 @@ void add_peer(struct lightningd *ld, u64 unique_id,
 	peer->channel_info = NULL;
 	peer->last_was_revoke = false;
 	peer->last_sent_commit = NULL;
-	peer->num_commits_sent = peer->num_commits_received
+	peer->commit_index[LOCAL]
+		= peer->commit_index[REMOTE]
 		= peer->num_revocations_received = 0;
 	peer->next_htlc_id = 0;
 	shachain_init(&peer->their_shachain);
@@ -1058,8 +1059,8 @@ static bool peer_start_channeld_hsmfd(struct subd *hsm, const u8 *resp,
 				      cfg->deadline_blocks,
 				      peer->last_was_revoke,
 				      peer->last_sent_commit,
-				      peer->num_commits_sent,
-				      peer->num_commits_received,
+				      peer->commit_index[LOCAL],
+				      peer->commit_index[REMOTE],
 				      peer->num_revocations_received,
 				      peer->next_htlc_id,
 				      htlcs, htlc_states,
@@ -1110,6 +1111,14 @@ static void peer_start_channeld(struct peer *peer, enum peer_state oldstate,
 		 -1, 1, peer_start_channeld_hsmfd, peer);
 }
 
+static bool peer_commit_initial(struct peer *peer)
+{
+	peer->commit_index[LOCAL] = peer->commit_index[REMOTE] = 1;
+
+	/* FIXME: Db channel_info, etc. */
+	return true;
+}
+
 static bool opening_funder_finished(struct subd *opening, const u8 *resp,
 				    const int *fds,
 				    struct funding_channel *fc)
@@ -1181,10 +1190,8 @@ static bool opening_funder_finished(struct subd *opening, const u8 *resp,
 		return false;
 	}
 
-	/* We should have sent and received the first commitsig */
-	if (!peer_save_commitsig_received(fc->peer, 0)
-	    || !peer_save_commitsig_sent(fc->peer, 0)) {
-		peer_internal_error(fc->peer, "Saving commitsig failed");
+	if (!peer_commit_initial(fc->peer)) {
+		peer_internal_error(fc->peer, "Initial peer to db failed");
 		return false;
 	}
 
@@ -1245,9 +1252,7 @@ static bool opening_fundee_finished(struct subd *opening,
 	/* old_remote_per_commit not valid yet, copy valid one. */
 	channel_info->old_remote_per_commit = channel_info->remote_per_commit;
 
-	/* We should have sent and received the first commitsig */
-	if (!peer_save_commitsig_received(peer, 0)
-	    || !peer_save_commitsig_sent(peer, 0))
+	if (!peer_commit_initial(peer))
 		return false;
 
 	log_debug(peer->log, "Watching funding tx %s",

lightningd/peer_control.h

@@ -67,7 +67,8 @@ struct peer {
 	u32 minimum_depth;
 
 	/* Tracking commitment transaction numbers. */
-	u64 num_commits_sent, num_commits_received, num_revocations_received;
+	u64 commit_index[NUM_SIDES];
+	u64 num_revocations_received;
 	u64 next_htlc_id;
 
 	/* Funding txid and amounts (once known) */

lightningd/peer_htlcs.c

@@ -816,6 +816,38 @@ static bool changed_htlc(struct peer *peer,
 		return update_in_htlc(peer, changed->id, changed->newstate);
 }
 
+static bool peer_save_commitsig_received(struct peer *peer, u64 commitnum)
+{
+	if (commitnum != peer->commit_index[LOCAL]) {
+		peer_internal_error(peer,
+			   "channel_got_commitsig: expected commitnum %"PRIu64
+			   " got %"PRIu64,
+			   peer->commit_index[LOCAL], commitnum);
+		return false;
+	}
+
+	peer->commit_index[LOCAL]++;
+
+	/* FIXME: Save to database, with sig and HTLCs. */
+	return true;
+}
+
+static bool peer_save_commitsig_sent(struct peer *peer, u64 commitnum)
+{
+	if (commitnum != peer->commit_index[REMOTE]) {
+		peer_internal_error(peer,
+			   "channel_sent_commitsig: expected commitnum %"PRIu64
+			   " got %"PRIu64,
+			   peer->commit_index[REMOTE], commitnum);
+		return false;
+	}
+
+	peer->commit_index[REMOTE]++;
+
+	/* FIXME: Save to database, with sig and HTLCs. */
+	return true;
+}
+
 int peer_sending_commitsig(struct peer *peer, const u8 *msg)
 {
 	u64 commitnum;
@@ -865,8 +897,6 @@ int peer_sending_commitsig(struct peer *peer, const u8 *msg)
 	if (!peer_save_commitsig_sent(peer, commitnum))
 		return -1;
 
-	/* FIXME: save commit_sig and htlc_sigs */
-
 	/* Last was commit. */
 	peer->last_was_revoke = false;
 	tal_free(peer->last_sent_commit);
@@ -943,40 +973,6 @@ static bool peer_sending_revocation(struct peer *peer,
 	return true;
 }
 
-/* Also used for opening's initial commitsig */
-bool peer_save_commitsig_received(struct peer *peer, u64 commitnum)
-{
-	if (commitnum != peer->num_commits_received) {
-		peer_internal_error(peer,
-			   "channel_got_commitsig: expected commitnum %"PRIu64
-			   " got %"PRIu64,
-			   peer->num_commits_received, commitnum);
-		return false;
-	}
-
-	peer->num_commits_received++;
-
-	/* FIXME: Save to database, with sig and HTLCs. */
-	return true;
-}
-
-/* Also used for opening's initial commitsig */
-bool peer_save_commitsig_sent(struct peer *peer, u64 commitnum)
-{
-	if (commitnum != peer->num_commits_sent) {
-		peer_internal_error(peer,
-			   "channel_sent_commitsig: expected commitnum %"PRIu64
-			   " got %"PRIu64,
-			   peer->num_commits_sent, commitnum);
-		return false;
-	}
-
-	peer->num_commits_sent++;
-
-	/* FIXME: Save to database, with sig and HTLCs. */
-	return true;
-}
-
 /* This also implies we're sending revocation */
 int peer_got_commitsig(struct peer *peer, const u8 *msg)
 {

lightningd/peer_htlcs.h

@@ -24,9 +24,6 @@ void peer_htlcs(const tal_t *ctx,
 		struct failed_htlc **failed_htlcs,
 		enum side **failed_sides);
 
-bool peer_save_commitsig_received(struct peer *peer, u64 commitnum);
-bool peer_save_commitsig_sent(struct peer *peer, u64 commitnum);
-
 int peer_sending_commitsig(struct peer *peer, const u8 *msg);
 int peer_got_commitsig(struct peer *peer, const u8 *msg);
 int peer_got_revoke(struct peer *peer, const u8 *msg);