lightningd: rename peer_state -> channel_state, remove OPENINGD.

And now we can finally do the db upgrade to remove any OPENINGD
channels once, since we never put them back.

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

common/type_to_string.h

@@ -17,7 +17,6 @@ union printable_types {
 	const struct bitcoin_tx *bitcoin_tx;
 	const struct htlc *htlc;
 	const struct preimage *preimage;
-	const struct channel_state *channel_state;
 	const struct channel_oneside *channel_oneside;
 	const struct wireaddr *wireaddr;
 	const secp256k1_pubkey *secp256k1_pubkey;

lightningd/Makefile

@@ -83,12 +83,12 @@ ALL_OBJS += $(LIGHTNINGD_OBJS)
 # We accumulate all lightningd/ headers in these three:
 LIGHTNINGD_HEADERS_NOGEN =			\
 	$(LIGHTNINGD_SRC:.c=.h)			\
-	lightningd/peer_state.h			\
+	lightningd/channel_state.h			\
 	lightningd/jsonrpc_errors.h
 
 # Generated headers
 LIGHTNINGD_HEADERS_GEN =			\
-	lightningd/gen_peer_state_names.h
+	lightningd/gen_channel_state_names.h
 
 ALL_GEN_HEADERS += $(LIGHTNINGD_HEADERS_GEN)
 
@@ -97,8 +97,8 @@ LIGHTNINGD_HEADERS = $(LIGHTNINGD_HEADERS_NOGEN) $(LIGHTNINGD_HEADERS_GEN) $(EXT
 
 $(LIGHTNINGD_OBJS): $(LIGHTNINGD_HEADERS)
 
-lightningd/gen_peer_state_names.h: lightningd/peer_state.h ccan/ccan/cdump/tools/cdump-enumstr
-	ccan/ccan/cdump/tools/cdump-enumstr lightningd/peer_state.h > $@
+lightningd/gen_channel_state_names.h: lightningd/channel_state.h ccan/ccan/cdump/tools/cdump-enumstr
+	ccan/ccan/cdump/tools/cdump-enumstr lightningd/channel_state.h > $@
 
 check-source: $(LIGHTNINGD_SRC:%=check-src-include-order/%) $(LIGHTNINGD_SRC_NOHDR:%=check-src-include-order/%)
 check-source: $(LIGHTNINGD_HEADERS_NOGEN:%=check-hdr-include-order/%)

lightningd/channel.c

@@ -3,6 +3,7 @@
 #include <gossipd/gen_gossip_wire.h>
 #include <inttypes.h>
 #include <lightningd/channel.h>
+#include <lightningd/gen_channel_state_names.h>
 #include <lightningd/jsonrpc.h>
 #include <lightningd/lightningd.h>
 #include <lightningd/log.h>
@@ -99,7 +100,7 @@ void derive_channel_seed(struct lightningd *ld, struct privkey *seed,
 struct channel *new_channel(struct peer *peer, u64 dbid,
 			    /* NULL or stolen */
 			    struct wallet_shachain *their_shachain,
-			    enum peer_state state,
+			    enum channel_state state,
 			    enum side funder,
 			    /* NULL or stolen */
 			    struct log *log,
@@ -190,7 +191,15 @@ struct channel *new_channel(struct peer *peer, u64 dbid,
 
 const char *channel_state_name(const struct channel *channel)
 {
-	return peer_state_name(channel->state);
+	return channel_state_str(channel->state);
+}
+
+const char *channel_state_str(enum channel_state state)
+{
+	for (size_t i = 0; enum_channel_state_names[i].name; i++)
+		if (enum_channel_state_names[i].v == state)
+			return enum_channel_state_names[i].name;
+	return "unknown";
 }
 
 struct channel *peer_active_channel(struct peer *peer)
@@ -230,22 +239,19 @@ void channel_set_last_tx(struct channel *channel,
 }
 
 void channel_set_state(struct channel *channel,
-		       enum peer_state old_state,
-		       enum peer_state state)
+		       enum channel_state old_state,
+		       enum channel_state state)
 {
 	log_info(channel->log, "State changed from %s to %s",
-		 channel_state_name(channel), peer_state_name(state));
+		 channel_state_name(channel), channel_state_str(state));
 	if (channel->state != old_state)
 		fatal("channel state %s should be %s",
-		      channel_state_name(channel), peer_state_name(old_state));
+		      channel_state_name(channel), channel_state_str(old_state));
 
 	channel->state = state;
 
-	/* We only persist channels/peers that have reached the opening state */
-	if (channel_persists(channel)) {
 	/* TODO(cdecker) Selectively save updated fields to DB */
 	wallet_channel_save(channel->peer->ld->wallet, channel);
-	}
 }
 
 void channel_fail_permanent(struct channel *channel, const char *fmt, ...)
@@ -284,11 +290,8 @@ void channel_fail_permanent(struct channel *channel, const char *fmt, ...)
 	}
 
 	channel_set_owner(channel, NULL);
-	if (channel_persists(channel)) {
 	drop_to_chain(ld, channel);
 	tal_free(why);
-	} else
-		delete_channel(channel, why);
 }
 
 void channel_internal_error(struct channel *channel, const char *fmt, ...)
@@ -314,10 +317,10 @@ void channel_fail_transient(struct channel *channel, const char *fmt, ...)
 	va_end(ap);
 	log_info(channel->log, "Peer transient failure in %s: %s",
 		 channel_state_name(channel), why);
+	tal_free(why);
 
 #if DEVELOPER
 	if (dev_disconnect_permanent(channel->peer->ld)) {
-		tal_free(why);
 		channel_internal_error(channel, "dev_disconnect permfail");
 		return;
 	}
@@ -325,15 +328,6 @@ void channel_fail_transient(struct channel *channel, const char *fmt, ...)
 
 	channel_set_owner(channel, NULL);
 
-	/* If we haven't reached awaiting locked, we don't need to reconnect */
-	if (!channel_persists(channel)) {
-		log_info(channel->log, "Only reached state %s: forgetting",
-			 channel_state_name(channel));
-		delete_channel(channel, why);
-		return;
-	}
-	tal_free(why);
-
 	/* Reconnect unless we've dropped/are dropping to chain. */
 	if (channel_active(channel)) {
 		struct lightningd *ld = channel->peer->ld;

lightningd/channel.h

@@ -2,7 +2,7 @@
 #define LIGHTNING_LIGHTNINGD_CHANNEL_H
 #include "config.h"
 #include <ccan/list/list.h>
-#include <lightningd/peer_state.h>
+#include <lightningd/channel_state.h>
 #include <lightningd/peer_htlcs.h>
 #include <wallet/wallet.h>
 
@@ -25,7 +25,7 @@ struct channel {
 	struct wallet_shachain their_shachain;
 
  	/* What's happening. */
- 	enum peer_state state;
+ 	enum channel_state state;
 
 	/* Which side offered channel? */
 	enum side funder;
@@ -88,7 +88,7 @@ struct channel {
 struct channel *new_channel(struct peer *peer, u64 dbid,
 			    /* NULL or stolen */
 			    struct wallet_shachain *their_shachain,
-			    enum peer_state state,
+			    enum channel_state state,
 			    enum side funder,
 			    /* NULL or stolen */
 			    struct log *log,
@@ -126,6 +126,7 @@ struct channel *new_channel(struct peer *peer, u64 dbid,
 void delete_channel(struct channel *channel, const char *why);
 
 const char *channel_state_name(const struct channel *channel);
+const char *channel_state_str(enum channel_state state);
 
 void channel_set_owner(struct channel *channel, struct subd *owner);
 
@@ -138,8 +139,8 @@ void channel_fail_permanent(struct channel *channel, const char *fmt, ...);
 void channel_internal_error(struct channel *channel, const char *fmt, ...);
 
 void channel_set_state(struct channel *channel,
-		       enum peer_state old_state,
-		       enum peer_state state);
+		       enum channel_state old_state,
+		       enum channel_state state);
 
 /* Find a channel which is not onchain, if any */
 struct channel *peer_active_channel(struct peer *peer);
@@ -172,7 +173,7 @@ static inline bool channel_can_remove_htlc(const struct channel *channel)
 		|| channel->state == ONCHAIND_OUR_UNILATERAL;
 }
 
-static inline bool channel_state_on_chain(enum peer_state state)
+static inline bool channel_state_on_chain(enum channel_state state)
 {
 	return state == ONCHAIND_CHEATED
 		|| state == ONCHAIND_THEIR_UNILATERAL
@@ -194,23 +195,7 @@ static inline bool channel_active(const struct channel *channel)
 
 static inline bool channel_wants_reconnect(const struct channel *channel)
 {
-	return channel->state >= CHANNELD_AWAITING_LOCKIN
-		&& channel->state <= CLOSINGD_COMPLETE;
-}
-
-/* BOLT #2:
- *
- * On disconnection, the funder MUST remember the channel for
- * reconnection if it has broadcast the funding transaction, otherwise it
- * SHOULD NOT.
- *
- * On disconnection, the non-funding node MUST remember the channel for
- * reconnection if it has sent the `funding_signed` message, otherwise
- * it SHOULD NOT.
- */
-static inline bool channel_persists(const struct channel *channel)
-{
-	return channel->state >= CHANNELD_AWAITING_LOCKIN;
+	return channel->state <= CLOSINGD_COMPLETE;
 }
 
 void derive_channel_seed(struct lightningd *ld, struct privkey *seed,

lightningd/peer_state.h → lightningd/channel_state.h

@@ -1,16 +1,11 @@
-#ifndef LIGHTNING_LIGHTNINGD_PEER_STATE_H
-#define LIGHTNING_LIGHTNINGD_PEER_STATE_H
+#ifndef LIGHTNING_LIGHTNINGD_CHANNEL_STATE_H
+#define LIGHTNING_LIGHTNINGD_CHANNEL_STATE_H
 #include "config.h"
 
-/* FIXME: rename channel_state! */
-enum peer_state {
-	UNINITIALIZED,
-
-	/* Negotiating channel opening: in opening daemon */
-	OPENINGD,
-
+/* These are in the database, so don't renumber them! */
+enum channel_state {
 	/* In channeld, still waiting for lockin. */
-	CHANNELD_AWAITING_LOCKIN,
+	CHANNELD_AWAITING_LOCKIN = 2,
 
 	/* Normal operating state. */
 	CHANNELD_NORMAL,
@@ -35,4 +30,4 @@ enum peer_state {
 };
 #define CHANNEL_STATE_MAX ONCHAIND_MUTUAL
 
-#endif /* LIGHTNING_LIGHTNINGD_PEER_STATE_H */
+#endif /* LIGHTNING_LIGHTNINGD_CHANNEL_STATE_H */

lightningd/peer_control.c

@@ -31,7 +31,6 @@
 #include <lightningd/bitcoind.h>
 #include <lightningd/build_utxos.h>
 #include <lightningd/chaintopology.h>
-#include <lightningd/gen_peer_state_names.h>
 #include <lightningd/hsm_control.h>
 #include <lightningd/jsonrpc.h>
 #include <lightningd/log.h>
@@ -463,16 +462,6 @@ void peer_connected(struct lightningd *ld, const u8 *msg,
 #endif
 
 		switch (channel->state) {
-			/* This can't happen. */
-		case UNINITIALIZED:
-			abort();
-
-			/* Reconnect: discard old one. */
-		case OPENINGD:
-			delete_channel(channel, "peer reconnected");
-			channel = NULL;
-			goto return_to_gossipd;
-
 		case ONCHAIND_CHEATED:
 		case ONCHAIND_THEIR_UNILATERAL:
 		case ONCHAIND_OUR_UNILATERAL:
@@ -1029,7 +1018,7 @@ static void handle_onchain_init_reply(struct channel *channel, const u8 *msg)
 	if (!channel_state_on_chain(state)) {
 		channel_internal_error(channel,
 				    "Invalid onchain_init_reply state %u (%s)",
-				    state, peer_state_name(state));
+				    state, channel_state_str(state));
 		return;
 	}
 
@@ -2879,17 +2868,6 @@ static const struct json_command close_command = {
 };
 AUTODATA(json_command, &close_command);
 
-
-const char *peer_state_name(enum peer_state state)
-{
-	size_t i;
-
-	for (i = 0; enum_peer_state_names[i].name; i++)
-		if (enum_peer_state_names[i].v == state)
-			return enum_peer_state_names[i].name;
-	return "unknown";
-}
-
 static void activate_peer(struct peer *peer)
 {
 	u8 *msg;

lightningd/peer_control.h

@@ -9,7 +9,7 @@
 #include <common/json.h>
 #include <common/wireaddr.h>
 #include <lightningd/channel.h>
-#include <lightningd/peer_state.h>
+#include <lightningd/channel_state.h>
 #include <stdbool.h>
 #include <wallet/wallet.h>
 #include <wire/peer_wire.h>
@@ -93,7 +93,6 @@ void peer_sent_nongossip(struct lightningd *ld,
 /* Peer has failed to open; return to gossipd. */
 void opening_failed(struct peer *peer, const u8 *msg TAKES);
 
-const char *peer_state_name(enum peer_state state);
 void setup_listeners(struct lightningd *ld);
 
 /* We've loaded peers from database, set them going. */

onchaind/onchain.c

@@ -15,7 +15,7 @@
 #include <common/version.h>
 #include <errno.h>
 #include <inttypes.h>
-#include <lightningd/peer_state.h>
+#include <lightningd/channel_state.h>
 #include <onchaind/gen_onchain_wire.h>
 #include <onchaind/onchain_types.h>
 #include <stdio.h>
@@ -966,7 +966,7 @@ static void wait_for_resolved(struct tracked_output **outs)
 			take(towire_onchain_all_irrevocably_resolved(outs)));
 }
 
-static void set_state(enum peer_state state)
+static void set_state(enum channel_state state)
 {
 	wire_sync_write(REQ_FD, take(towire_onchain_init_reply(NULL, state)));
 }

wallet/db.c

@@ -191,6 +191,8 @@ char *dbmigrations[] = {
     "ALTER TABLE payments ADD COLUMN route_channels TEXT;",
     "CREATE TABLE htlc_sigs (channelid INTEGER REFERENCES channels(id) ON DELETE CASCADE, signature BLOB);",
     "CREATE INDEX channel_idx ON htlc_sigs (channelid)",
+    /* Get rid of OPENINGD entries; we don't put them in db any more */
+    "DELETE FROM channels WHERE state=1",
     NULL,
 };
 

wallet/wallet.c

@@ -625,11 +625,6 @@ bool wallet_channels_load_active(const tal_t *ctx, struct wallet *w)
 	bool ok = true;
 	sqlite3_stmt *stmt;
 
-	/* Get rid of OPENINGD entries; they don't last across reconnects */
-	stmt = db_prepare(w->db, "DELETE FROM channels WHERE state=?");
-	sqlite3_bind_int64(stmt, 1, OPENINGD);
-	db_exec_prepared(w->db, stmt);
-
 	/* We load all channels */
 	stmt = db_query(
 	    __func__, w->db, "SELECT %s FROM channels;",